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Mallinckrodt NELLCOR NPB-4000, Service Manual

The Mallinckrodt NELLCOR NPB-4000 is a high-quality medical device used for noninvasive monitoring of a patient's blood oxygen level. Ensure its optimal usage with the detailed service manual available for free download from our website. Easily access the manual and maximize the potential of this exceptional product.

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Section 17: Drawings

17-13

Figure 17-6

NPB-4000/C Main PCB Schematic (Sheet 2 of 3)

3

2

1

4

2

1

3

4

16

1

1

6

14

11

9

1

2

7

6

5

3

1

2

4

11

1

1

2

3

6

5

4

1

2

3

6

5

4

11

10

12

1

2

13

8

9

6

14

7

3

1

8

9

10

1

2

3

7

6

5

14

13

12

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

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33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

2

1

3

2

1

3

8

2

8

12

6

14

1

7

3

4

5

6

3

4

5

6

1

2

3

7

6

5

1

2

3

8

4

8

4

1

3

1

1
2
3

4

5

6

2

1

3

2

18

2

7

3

4

6

1

8

5

1

19

20

10

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

1

13

7

1

2

3

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

3

4

5

6

2

1

3

1

1

1

1

2

3

3

1

2

1

1

15

5

17

3

2

1

3

1

1

2

7

8

8

12

15

14

1

2

3

13

4

16

8

1

1

1

1

1

1

1

2

1

1

1

GND PROBE POINTS (THRU-HOLE)

LOCATE CLOSE TO POWER SUPPLY CONNECTOR (J3)

J4

J4

J4

J4

Q6

C66

C67

C34

C35

C40

C48

C33

C20

C36

C45

C29

C27

C23

C19

C58

U10

C39

TP195

TP221

C60

V2

V1

R118

U12

U10

J9

R73

R101

R50

R53

R55

R80

R86

R64

R68

R61

R72

R56

R59

R57

R52

R88

R95

R66

R62

R100

R77

R69

R76

R65

R54

R81

R78

R117

R70

R74

R79

R96

R93

R92

R44

R37

R33

R24

R41

R36

R27

R21

R87

R84

R89

R94

R98

C101

R91

R110

R108

R120

R109

R111

R119

-

+

U27

Q12

C102

R35

R83

C65

U16

R99

TP258

PS1

PS2

U23

U23

U23

U23

D2

+

-

U16

+

-

U16

+

-

U16

+

-

U16

C46

C3

C70

C73

J3

TP424

TP460

TP435

TP174

Q9

Q7

J2

J2

U10

U10

J2

J2

J2

J2

J2

J2

Q10

-

+

U25

-

+

U25

-

+

U27

C42

U25

U27

TP242

C103

D1

C104

U15

D4

D5

C100

R82

Q2

R67

U10

U18

U10

U26

R32

R39

TP267

U10

R31

VR1

R97

TP187

TP268

TP272

TP202

TP188

TP256

TP192

TP164

TP263

TP166

TP296

TP189

TP243

TP234

TP134

TP182

TP150

TP100

TP158

TP172

C49

TP273

TP287

TP177

TP297

TP175

TP412

RT1

TP181

TP180

TP309

R63

TP302

TP199

TP232

TP176

TP292

Q11

Q8

R60

TP144

TP123

TP129

Q1

R4

R2

R85

R90

C72

Q13

TP159

C28

C69

TP257

U10

C64

TP455

C71

C54

TP445

U10

Q5

R19

C63

TP259

R136

R122

R123

R124

R135

Q10

R126

U17

R133

C88

C87

U28

U28

C86

C85

R130

R131

R132

TP420

TP421

TP423

TP425

TP422

TP426

DS6

R134

TP169

TP170

R140

C93

TP427

C97

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

1%

NPNEON

VPVS

OSC

TEMPAD

+5V

+5V

+5V

+5V

+5V

+5V

+5V

+5V

+5V

+5V

+5V

NIBPCNTLVLV

VBATTAD

R87

TXDATA

RTS

GND

GND

GND

GND

GND

GND

GND

GND

GND

GND

ALARM_SILENCE

ALARM_SILENCE

ALARM_SILENCE

PSOFF

NPANPWR

ACMAINST

NIBPRSR2

LCDCNTRSTUP

+5REF

LCDCONTRAST

AUDTONVOL

LCDCONTRST

PTR_CTS

PTR_RXD

PTR_RESET

RXDATA

DTR

DSR

CTS

V

DCST

DC/LED

PB2IN

PB3IN

SPKR_ADJ_PLS

PB4IN

PUMPON

SYNC/ALARMSOUND

LCDCNTRSTDWN

ON/OFF

ON/OFF

+5VREG

+5VREG

+5VREG

+5VREG

+5VREG

+5VREG

+5VREG

+5VREG

+5VREG

BACKLITE_ON

SPKRFREQ

+3.3V

+3.3V

+3.3V

+3.3V

+3.3V

+3.3V

+3.3V

+3.3V

+3.3V

+3.3V

+3.3V

SPKRU/D

SPEAKER

SPEAKER

SIGRTN

SIGRTN

MAINS/LED

NIBPPB

VBATTP

VBATTP

VBATTP

VBATTP

VBATTP

VBATTP

NURSECALL

DEFIBSYNCPLS

NIBPRSR1

PTR_TXD

DISPOFF

DEFIBKEY

CNTRSTPWM

ALRMSIL

PSOFF

NP3WYV

NPPVEN

NPPVEN

+12V

+12V

+12V

+12V

+12V

+12V

+12V

+12V

+12V

+12V

EARLYWRNG

-24V

-24V

NPPVEN3

DEFIBOUT

TO VIA

TO VIA

TO VIA

TO VIA

TO VIA

TO VIA

CONTROL VALVE

6V COIL

3 WAY VALVE

2N4401

HCT244

74AC240

HCT244

LM358

FZT690BCT

LMC660

DMS873

DMS873

4066

4066

4066

4066

LMC660

LMC660

LMC660

LMC660

16V

16V

2N4401

2N4403

HCT244

HCT244

SI9936DY

LM358

LM358

LM358

LM358

LM358

TK11450

1N4001

1N4001

2N4401

HCT244

DS1669S

74HCT244

DS1666S

HCT244

LM337L

SI9928D4

2N4401

VN2210N3

FZT549CT

HCT244

20V

20V

20V

HCT244

2N4401

SI9936DY

74LVC541

20V

74HC123

74HC123

PWM FROM ACTEL

(P3.7)

(P1.1)

POWER ON LED

BACKLITE

WAVEFORM

0 TO 3.3

CS

V-

V+

NC

NC

C1

GND

VD

VCC

NC

NC

C1

GND

VD

VCC

NO

Y

Z

E

NO

Y

Z

E

NO

Y

Z

E

VDD

VSS

16V

25V

V-

V+

V-

V+

CTRL

GND

VOUT

VIN

UC

V+

RH

RW

DC

V-

RL

D

BE

AE

GND

VCC

U/D

NC1

NC2

INC

NC3

CS

NC4

GND

VL

NC5

NC6

VH

VW

VB

NC7

VCC

IN

COM

OUT

16V

D

S

G

Q

Q

R

B

A

CEXT

CREXT

VCC

GND

0.1

680PF

0.1

1.0UF

1.0UF

0.1

0.1

680PF

0.1

0.1

.01UF

.01UF

.01UF

.01UF

0.1

0.1

0.1

VSO-E95574

11-18-3-BV-5-P-77

20K

3.92K

100K

3.92K

100K

332K

75K

243K

68.1K

68.1K

182K

20K

562K

665K

665K

562K

20K

20K

665K

665K

100K

100K

33.2K

20K

100K

100K

8.25K

430

10K

20K

10K

100K

10K

10K

430

33.2

33.2

33.2

33.2

100K

100K

100K

100K

10K

10K

10K

10K

33.2K

0.1

430

100K

10K

1K

20K

10K

3

.01UF

33.2

100K

.01UF

100K

BAT54C

10UF

10UF

220UF

10UF

0.1

.01UF

BAT54C

.01UF

0.1

10K

100K

10K

10K

10K

100K

10UF

VALUE

100K

100K

100K

10K

10K

10K

0.1

0.1

0.1

22UF

22UF

22UF

10K

.01UF

10K

100K

100K

33.2K

10K

1.5K

0_OHM

22UF

0.1

0.1

.01UF

100

10K

10K

100

33.2K

0.1

.01UF

Summary of Contents for NELLCOR NPB-4000

Page 1: ...0 635 5267 outside of the United States call your local Mallinckrodt representative Caution Federal law U S A restricts this device to sale by or on the order of a physician 2000 Mallinckrodt Inc All rights reserved 062643A 0700 SERVICE MANUAL NPB 4000 4000C Patient Monitor ...

Page 2: ...Nellcor Puritan Bennett Durasensor and Oxisensor II are trademarks of Mallinckrodt Inc Purchase of this instrument confers no expressed or implied license under any Mallinckrodt patent to use the instrument with any sensor that is not manufactured or licensed by Mallinckrodt www mallinckrodt com Mallinckrodt Inc 675 McDonnell Boulevard P O Box 5980 St Louis MO 63134 Telephone 314 654 2000 Toll Fre...

Page 3: ...enu 4 1 4 3 Diagnostic Mode 4 3 Section 5 Troubleshooting 5 1 5 1 Introduction 5 1 5 2 How to Use This Section 5 1 5 3 Who Should Perform Repairs 5 1 5 4 Replacement Level Supported 5 1 5 5 Obtaining Replacement Parts 5 1 5 6 Troubleshooting Guide 5 2 Section 6 Disassembly Guide 6 1 6 1 Introduction 6 1 6 2 How to Use This Section 6 1 6 3 Disassembly Sequence Flow Charts 6 3 6 4 Closed Case Disass...

Page 4: ...ction 13 Microprocessor Computer and Control Theory of Operation 13 1 13 1 General 13 1 13 2 Power Supply Connections 13 2 13 3 NIBP Processing 13 4 13 4 Recorder Operation 13 5 13 5 Isolated Front End Interface 13 7 13 6 RS 232 Serial Port Interface 13 8 13 7 CPU Connections 13 9 13 8 DRAM Control 13 12 13 9 FLASH Control 13 14 13 10 LCD Display 13 16 13 11 Real Time Clock RTC 13 18 13 12 DUART C...

Page 5: ...c 15 9 15 10 Alarm Section 15 10 15 11 NIBP Pump Control 15 10 15 12 Safety Devices 15 10 Section 16 MP 205 Service Manual Npb P N 044540A 0296 16 1 16 1 Overview 16 1 16 2 Module Descripton 16 1 16 3 Circuit Description 16 2 16 4 Interconnections 16 2 16 5 Sensor Interconnect 16 2 16 6 Oxichip Circuit 16 2 16 7 Preamp 16 3 16 8 Programmable Gain Amplifier PGA Demodulator and Demultiplexer 16 3 16...

Page 6: ...ower Supply Interface 13 2 Figure 13 2 NIBP Processing Circuitry Block Diagram 13 4 Figure 13 3 Recorder System Block Diagram 13 6 Figure 13 4 Isolated Front End Block Diagram 13 7 Figure 13 5 16 Bit Word 13 8 Figure 13 6 Watch Dog Timer Block Diagram 13 11 Figure 13 7 CPU Signals 13 12 Figure 13 8 DRAM Timing 13 13 Figure 13 9 RAS and CAS Requirements 13 14 Figure 13 10 Flash Cycle 13 15 Figure 1...

Page 7: ... 205 PCB Schematic Sheet 1 of 2 17 3 Figure 17 2 MP 205 PCB Schematic Sheet 2 of 2 17 5 Figure 17 3 NPB 4000 C Power Supply PCB Schematic Sheet 1 of 2 17 7 Figure 17 4 NPB 4000 C Power Supply PCB Schematic Sheet 2 of 2 17 9 Figure 17 5 NPB 4000 C Main PCB Schematic Sheet 1 of 3 17 11 Figure 17 6 NPB 4000 C Main PCB Schematic Sheet 2 of 3 17 13 Figure 17 7 NPB 4000 C Main PCB Schematic Sheet 3 of 3...

Page 8: ...s 4 5 Table 5 1 Problem Categories 5 2 Table 5 2 Power Problems 5 3 Table 5 3 Serviceable Hardware Error Codes 5 4 Table 5 4 Error Code Categories 5 6 Table 5 5 Switches Knob Problems 5 7 Table 5 6 Display Audible Tones Problems 5 8 Table 5 7 Operational Performance Problems 5 9 Table 7 1 Top Assembly Figure 7 1 7 3 Table 7 2 Front Case Assembly Figure 7 2 7 5 Table 7 3 Front Case Assembly Figure ...

Page 9: ...in injury or death to the patient or user Warnings are boxed and highlighted in boldface type 1 2 2 Caution A caution precedes an action that may result in damage to or malfunction of the monitor Cautions are highlighted in boldface type 1 2 3 Note A note gives information that requires special attention 1 3 NPB 4000 C PATIENT MONITOR DESCRIPTION The purpose and function of the NPB 4000 C patient ...

Page 10: ...peration and circuit analysis sections of this manual you must know how to operate the monitor Refer to the NPB 4000 C operator s manual To understand the various Nellcor sensors ECG leads blood pressure cuffs and temperature probes that work with the monitor refer to the individual directions for use that accompany these accessories ...

Page 11: ...g instructions in the directions for use that accompany these accessories 2 2 PERIODIC SAFETY AND FUNCTIONAL CHECKS The NPB 4000 C requires no routine service or calibration other than cleaning and battery maintenance The following performance verification tests may be used following repair or during routine maintenance if required by your local institution 1 Inspect the exterior of the NPB 4000 C...

Page 12: ...al Note Storing the NBP 4000 C for a long period without charging the battery may degrade the battery capacity A complete battery recharge requires 8 hours The battery may require a full charge discharge cycle to restore normal capacity Mallinckrodt recommends that the NPB 4000 C s sealed lead acid batteries be replaced at 2 year intervals Refer to Section 6 Disassembly Guide 2 4 ENVIRONMENTAL PRO...

Page 13: ...PMENT NEEDED Table 3 1 lists the equipment required for performance verification Table 3 1 Required Test Equipment Equipment Description Digital multimeter DMM Fluke Model 87 or equivalent Sensor extension cable EC 8 Durasensor oxygen transducer DS 100A Oxisensor II oxygen transducer D 25 ECG cable CE 10 ECG electrodes standard ECG leads LE series NIBP hose SHBP 10 NIBP cuff SCBP series Pulse oxim...

Page 14: ... indicator is lit 3 Charge battery for at least 8 hours Note The battery may require a complete charge discharge cycle to restore its normal capacity depending on its previous usage 4 The only way to check for a full charge is to perform the procedure in paragraph 3 3 2 Battery Performance Test 3 3 2 Battery Performance Test 1 The NPB 4000 monitor is specified to typically operate on battery power...

Page 15: ...wers down due to low battery condition NPB 4000 C monitor must operate for at least 3 hours before monitor automatically powers down due to low battery condition 11 Verify low battery alarm occurs 15 30 minutes before battery fully discharges 12 Allow monitor to operate until it automatically powers down due to low battery condition Verify audible alarm sounds when monitor automatically shuts down...

Page 16: ...played 3 3 4 Hardware and Software Tests Hardware and software testing include the following tests 3 3 4 1 SpO2 Testing 3 3 4 2 Operation with an ECG Simulator 3 3 4 3 Operation with a Respiration Simulator 3 3 4 4 Verification of Pneumatic System 3 3 4 5 Operation with a Temperature Simulator 3 3 4 6 General Operation 3 3 4 1 SpO2 Testing SpO2 testing includes the following tests 3 3 4 1 1 Alarms...

Page 17: ...n a Pulse bar begins to track artificial pulse signal from SRC 2 b Initially zero is displayed in SpO2 frame c After about 10 to 20 seconds monitor displays saturation and heart rate as specified by tester Verify values are within following tolerances Oxygen Saturation Range 79 to 83 Heart Rate Range 35 to 41 bpm d Audible alarm sounds and both SpO2 and HEART RATE displays will flash indicating bo...

Page 18: ...to SpO2 5 Press Heart Rate Tone Volume switch on front panel of monitor 6 Within 3 seconds of having pressed Heart Rate Tone Volume switch rotate knob CW and verify beeping heart rate tone sound level increases 7 Rotate knob CCW and verify beeping heart rate tone decreases until it is no longer audible 8 Rotate knob CW to return beep volume to a comfortable level Note Three seconds after the last ...

Page 19: ...ystem components to test circuit operation A Nellcor Oxisensor II oxygen transducer model D 25 is used to examine LED intensity control The red LED is used to verify intensity modulation caused by the LED intensity control circuit 1 Connect EC 8 sensor extension cable to monitor 2 Connect D 25 sensor to sensor extension cable 3 Press On Standby switch to turn monitor on 4 Leave sensor open with LE...

Page 20: ...l power up sequence verify the following monitor reactions a After at least five heartbeats monitor displays a heart rate of 30 5 bpm b Audible alarm will sound and HEART RATE display will flash indicating heart rate is below default lower alarm limit 7 Press Alarm Silence switch Verify audible alarm is silenced 8 Increase heart rate setting on ECG simulator to 240 bpm 9 After at least five heartb...

Page 21: ...to ECG input port on NPB 4000 C Note The accuracy of NPB 4000 C ECG measurements is 3 breaths per minute In the procedure below add the tolerance of the simulator to the acceptable range of readings 4 Set simulator for respiration rate of 120 breaths per minute 5 Press On Standby switch to turn monitor on 6 After normal power up sequence verify the following monitor reactions a Monitor displays re...

Page 22: ...rder or sequentially Prior to performing any of these tests perform the following setup procedure If these tests are performed in sequence this procedure needs to be performed once prior to the first test 1 Turn on Bio Tek simulator and press MODE button to place simulator in test mode Simulator screen will indicate Internal Cuff and Pressure Gauge 2 Connect simulator hose to NIBP connector on NPB...

Page 23: ... tests may be performed at this time If no further NIBP tests are to be conducted turn the NPB 4000 C off Normal monitoring operation will return the next time the monitor is turned on 3 3 4 4 2 Pneumatic Leakage The pneumatic leakage test verifies the integrity of the pneumatic system A timer stop watch is required for this test 1 Ensure Bio Tek simulator is in test mode The simulator should disp...

Page 24: ...flation rate of the NPB 4000 C A timer stop watch is required for this test 1 Ensure Bio Tek simulator is in test mode The simulator should display Pressure Gauge 2 Ensure simulator is set up for internal cuff 3 Ensure NIBP Test screen is active on NPB 4000 C 4 Press Heart Rate Tone Volume switch on NPB 4000 C to ensure both valves are closed 5 Perform offset adjustment so simulator and NBP 4000 C...

Page 25: ...h display a pressure of 0 mmHg a Press Contrast Adjust switch on NPB 4000 C b Press Zero button on simulator to 6 Press and hold NIBP Start Stop switch on NPB 4000 C to activate pump 7 Hold NIBP Start Stop switch until NPB 4000 C displays a pressure of 280 mmHg 8 Start 1 minute timer and simultaneously press and hold Alarm Silence switch on NPB 4000 C Note This will cause the pneumatic system to d...

Page 26: ...pressurize the system until the monitor s over pressure relief system activates The simulator will display the pressure value that caused the NPB 4000 C over pressure relief system to activate The test will have been successfully completed if the simulator displays a pressure reading of 280 mmHg to 330 mmHg 8 Press and hold Heart Rate Tone Volume switch to ensure NPB 4000 C displays a pressure of ...

Page 27: ... for a qualitative test 1 Connect EC 8 sensor extension cable to monitor 2 Connect Nellcor Durasensor oxygen transducer model DS 100A to sensor extension cable 3 Clip DS 100A to subject as recommended in sensor directions for use 4 Connect a CE 10 ECG cable to NPB 4000 C 5 Connect ECG leads to cable 6 Connect ECG electrodes to leads 7 Apply ECG electrodes to subject according to leads and electrod...

Page 28: ...negative lead to RS 232 connector pin 5 GND or shell of connector 3 Connect DMM positive lead to the following pins in turn and verify voltage values listed in Table 3 3 Note Voltage for pin 9 will be that listed for the no alarm condition Table 3 3 Serial Port Voltages Measurement V Pin Signal Min Type Max 1 not used 0 4 0 0 0 4 2 RXD 0 4 0 0 0 4 3 TXD 5 0 9 0 15 0 4 DTR 5 0 9 0 15 0 5 GND 0 4 0 ...

Page 29: ... ANSI AAMI ES1 1993 3 4 1 Ground Integrity 3 4 2 Electrical Leakage 3 4 1 Protective Earth Continuity This test checks the integrity of the power cord ground wire from the AC plug to the instrument chassis ground The current used for this test is less than or equal to 6 Volts RMS 50 to 60 Hz and 25 Amperes 1 Connect the monitor AC mains plug to the analyzer as recommended by the analyzer operating...

Page 30: ...ge Current Values Test Condition Allowable Leakage Current microamps Normal polarity 300 Normal polarity Neutral L2 open 1 000 Reverse polarity 300 Reverse polarity Neutral L2 open 1 000 3 4 2 2 Enclosure Leakage Current This test is in compliance with IEC 601 1 enclosure leakage current and AAMI Standard ES1 enclosure risk current This test is for ungrounded enclosure current measured between enc...

Page 31: ...he ECG connector on the NPB 4000 C and the appropriate input connector on the analyzer 4 Turn on the NPB 4000 C 5 Perform the patient leakage current test as recommended by the analyzer operating instructions Note Patient leakage current is measured under various conditions of the AC mains and protective earth conductor For each condition the measured leakage current must not exceed that indicated...

Page 32: ...is test requires the same test cables for each patient connector as described in paragraph 3 4 2 3 Warning AC mains voltage will be present on the applied part terminals during this test Exercise caution to avoid electrical shock hazard 1 Configure electrical safety analyzer as recommended by analyzer operating instructions 2 Connect monitor s AC mains power cord to analyzer as recommended by anal...

Page 33: ...Configure the electrical safety analyzer as recommended by the electrical analyzer s operating instructions 2 Connect the monitor s AC mains power cord to the electrical analyzer as recommended by the electrical analyzer s operating instructions 3 Connect the patient test lead combination in table 3 8 to the appropriate input connector on the electrical analyzer 4 Turn on the NBP 4000 4000C 5 Perf...

Page 34: ...sed Open 50 Reversed Open Normal 50 Reversed Closed Normal 10 Normal Closed Open 50 Table 3 9 Allowable Leakage Current Polarity Neutral Line Wire L2 Power Line Ground Wire Allowable Leakage Current microamps Normal Open Normal 50 Normal Closed Normal 10 ...

Page 35: ... do not display any information associated with normal monitoring operation Use the following procedure to configure the power up default settings for the NPB 4000 C monitor 1 Set NPB 4000 C to normal monitoring mode 2 Adjust each accessible setting on monitor as desired Note Use the techniques described in the operator s manual Such settings include alarm limits choice of display type for the gra...

Page 36: ...e audible alarm for a particular parameter via the Alarm Limits Menu Some institutions may wish to prevent audible alarms from being permanently silenced If so Deny Access should be selected Alarm Suspend Make Available Deny Access If Make Available is chosen the caregiver may invoke the Alarm Suspend Mode by pressing and holding the Alarm Silence switch for 2 seconds Some institutions may wish to...

Page 37: ...ted to power down the monitor 6 After making changes to menu items pick menu item Accept current settings as power up defaults 7 Select YES 8 Select Done Upon selecting Done a Notice screen will appear with the directions that the monitor must be powered off and that any changes made to the power up defaults will be in effect next time the unit is powered up 4 3 DIAGNOSTIC MODE The purpose of Diag...

Page 38: ...il on error codes 4 3 2 System Information This screen displays several system related items Monitor On time Displays the number of hours rounded to the nearest hour that the Main PCB has been operational This value may not be reset Note The Monitor On time value is stored in nonvolatile memory located in the real time clock chip when a new Main PCB is installed this value will be reset to zero Ba...

Page 39: ...ficance can be derived from the values of the numbers displayed However others of the A D channels read DC voltages for example power supply voltages and battery voltage those voltage values directly provide useful diagnostic information The Primary and Secondary Status messages from the SpO2 module will be displayed and updated at the rate of about once per second Presence of the correct SpO2 mes...

Page 40: ...or closed Safety Valve Display The display indicates whether the safety valve is open or closed Activate pump For as long as the NIBP Start Stop switch is pressed the pump will run If system pressure reaches the hardware over pressure protection point 280 to 330 mmHg the safety valve will open and the pump will be disabled until the pressure falls below the safety threshold Deflate For as long as ...

Page 41: ...move and replace components or make adjustments If your medical facility does not have qualified service personnel contact Mallinckrodt Technical Services or your local Mallinckrodt representative 5 4 REPLACEMENT LEVEL SUPPORTED The replacement level supported for this product is to the printed circuit board PCB and major subassembly level Once you isolate a suspected PCB follow the procedures in ...

Page 42: ...odt Technical Services or your local Mallinckrodt representative Table 5 1 Problem Categories Problem Area Refer to Paragraph 1 Power No power up Fails power on self test Powers down without apparent cause 5 6 1 2 Error Messages 5 6 2 3 Switches Knob Monitor does not respond properly to switches 5 6 3 4 Display Audible Tones Display does not respond properly Tones do not sound properly 5 6 4 5 Ope...

Page 43: ... cord is connected and green BATTERY CHARGING AC SOURCE indicator is lit or ensure DC source is connected and green BATTERY CHARGING DC SOURCE indicator is lit If monitors operates successfully battery may be discharged 2 Recharge battery as directed in paragraph 3 3 1 If battery fails to hold charge replace battery 3 If problem persists replace main PCB 4 If problem persists replace power supply ...

Page 44: ... by releasing pressure by normal means NIBP system has released pressure using safety valve 1 Cycle power 2 Check for blocked hoses in pneumatic system 3 Replace main PCB Note This error may occur during a blood pressure measurement in STAT mode if the leg cuff is used 4 Measured value of 3 3 volt power supply was low 1 Check power supply 2 Replace power supply assembly 5 Measured value of 3 3 vol...

Page 45: ... MP 205 module 3 If problem persists replace main PCB 65 66 MP 205 SpO2 module has detected an error during initialization 1 Replace MP 205 module 2 If problem persists replace main PCB 6E 71 MP 205 SpO2 module has detected an error on its serial port 1 Replace MP 205 module 2 If problem persists replace main PCB 5 6 2 2 Other Error Codes If an error code occurs that is not listed in paragraph 5 6...

Page 46: ...gories Code hex Explanation 500xxxx internal user interface error 501xxxx remote serial port error 502xxxx date and time error 503xxxx NIBP error 504xxxx front end error 505xxxx alarm error 506xxxx audio error 507xxxx recorder error 508xxxx trend error 509xxxx flash memory data error 50axxxx SpO2 error 50bxxxx ECG error 50cxxxx power down task error 50dxxxx on board diagnostic error 50exxxx power ...

Page 47: ...0 C powers up but some or one of the other switches respond 1 Ensure keypad is plugged into Main PCB If connection is good change keypad 2 If problem persists change Main PCB 3 When knob is rotated no highlight appears on display screen and or monitor does not respond to knob presses 1 Ensure encoder cable is plugged into Main PCB If connection is good change encoder 2 If problem persists replace ...

Page 48: ...mentarily then turning knob four revolutions in each direction Turning knob counter clockwise should brighten screen turning knob clockwise should darken screen Or 2 NPB 4000C Adjust LCD screen contrast by pressing contrast adjust switch momentarily Screen will toggle background color 3 Ensure red LED located on top left corner of main PCB is illuminated If LED is not illuminated monitor is not in...

Page 49: ...operational but physiological values are suspect or nonexistent 1 Replace each patient cable or hose with a known serviceable cable 2 Ensure internal ECG temperature and SpO2 cables are connected to main PCB Ensure hoses in pneumatic system are properly connected and NIBP pump motor is connected to power supply PCB 3 If problem persists replace main PCB 2 Printer paper will not advance 1 Open prin...

Page 50: ... Action 3 Printer paper will advance but paper remains blank when printing should be present 1 Open printer door and check paper is oriented correctly paper should exit from bottom of roll See operator s manual for an illustration of correct paper orientation 2 If problem persists replace printer ...

Page 51: ...ry cables function switches chassis enclosures The following tools are required small Phillips head screwdriver medium Phillips head screwdriver needle nose pliers 9 16 inch socket for knob encoder WARNING Before attempting to open or disassemble the NPB 4000 C disconnect the power cord from the NPB 4000 C Caution Observe ESD electrostatic discharge precautions when working within the unit Note So...

Page 52: ... paragraphs 6 4 6 5 and 6 6 contain detailed disassembly instructions accompanied by illustrations The rectangular boxes on the flow charts represent the various components or sub assemblies The digits appearing in these boxes are the part numbers of the component or subassembly Section 7 Spare Parts contains a complete listing of the available spare parts and exploded views ...

Page 53: ...Section 6 Disassembly Guide 6 3 6 3 DISASSEMBLY SEQUENCE FLOW CHARTS Figure 6 1 NPB 4000 C Disassembly Sequence Flow Chart Sheet 1 ...

Page 54: ...ling the main case of the monitor Step A1 Procedure To remove front panel knob a Knob is friction fit on encoder shaft Grasp sides of knob firmly and pull straight back from monitor knob should slip off encoder shaft b If knob does not move separate front and rear cases as described in step B1 There is a hole in front cover behind knob insert small screwdriver blade in hole and push firmly against...

Page 55: ... Procedure To remove printer a Press Paper Eject button on printer right side Door will drop forward b Remove paper roll if installed Two fastening screws are visible at back panel of printer c Use screwdriver to back out captive fastening screws d Pull printer straight out side of monitor disengaging connector at rear of module from Printer PCB in assembly Removal of Printer PCB can be accomplish...

Page 56: ...and rear case assemblies a Remove handle as indicated in step A1 b Use screwdriver to remove four screws fastening Rear Case Assembly to Front Case Assembly Retain for reassembly Illustration Procedure c Separate two major case assemblies There is enough cable and tubing slack to permit the two assemblies to remain at approximately a 90 degree angle to each other Illustration Main ribbon cable ass...

Page 57: ...located at corners of SpO2 module lift off ground wire and foil shield pull SpO2 module straight up to disengage it from main PCB ECG Temp cable connector assembly unplug connector from Main PCB remove screws fastening ECG connector to front case rotate temperature connector counter clockwise to unscrew it from fastening nut on outside of front case The encoder assembly unplug connector from main ...

Page 58: ... Guide 6 8 Step B3 Procedure To remove main PCB a Disconnect connectors from main PCB for Switch panel SpO2 ECG Temp Encoder LCD display Backlight Illustration Encoder Switchpanel connector NIBP Tubing connector SpO2 cable ...

Page 59: ... Switch panel is attached with an adhesive to front panel b Carefully lift up one corner of switch panel and peel switch panel away from front panel When switch panel is free feed connector through slot in front panel Step B5 Procedure To remove LCD a Remove six fastening screws around periphery of display back plate Retain fastening screws for reassembly b Carefully remove grounding straps noting...

Page 60: ...bes the items that may be removed replaced on the rear case assembly First perform the procedure described in step B1 to separate the front and rear case assemblies Step C1 Procedure To remove battery a Use screwdriver to remove three screws holding battery cover plate in place Illustration ...

Page 61: ...re b Grasp strap accessible through opening in top foam cover and gently pull battery from its housing Illustration Procedure c Remove wire connectors from battery clips Remember red wire is connected to plus side of battery pack Illustration ...

Page 62: ...stalled remove it as described in step A3 c If a printer is not installed remove printer blanking cover by slipping small flat blade screwdriver into one of the slots on the blanking cover Use screwdriver to gently depress snap tab on inside of cover while pulling cover away from monitor After first tab is released repeat process on other side of cover and remove cover Illustration Battery housing...

Page 63: ...ar case assembly Illustration Procedure f Disconnect speaker twisted pair connector from power supply PCB Speaker is mounted on one side of battery housing g If printer had been installed disconnect ribbon cable from printer PCB Printer PCB may be removed by removing four screws fastening PCB to battery housing Illustration Screws fastening battery housing ...

Page 64: ... a Remove AC power input fuses as shown using fuse pullers Illustration Step C4 Procedure To remove power supply assembly a On rear panel of monitor remove eight screws fastening power supply assembly Illustration Fuse F1 and F2 Screws fastening power supply assembly ...

Page 65: ... Guide 6 15 Procedure b Carefully lift power supply assembly from rear case c Power supply assembly may be disassembled into the following elements Power supply PCB NIBP pump Heat sink chassis Main ribbon cable Illustration ...

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Page 67: ...RTS 7 1 INTRODUCTION Spare parts along with part numbers are shown in Table 7 1 through Table 7 7 Item No corresponds to the circled callout numbers in Figure 7 1 through Figure 7 6 The Step Ref corresponds to the disassembly steps described in Section 6 ...

Page 68: ...Section 7 Spare Parts 7 2 Figure 7 1 NPB 4000 C Top Assembly Drawing ...

Page 69: ...Section 7 Spare Parts 7 3 Table 7 1 Top Assembly Figure 7 1 Item No Description NPB Part No Step Ref NPB 4000 2 Handle 047394 A2 NPB 4000C 2 Handle 047394 A2 ...

Page 70: ...Section 7 Spare Parts 7 4 Figure 7 2 NPB 4000 C Front Case Assembly Diagram Sheet 1 of 2 ...

Page 71: ...Inverter backlight 047378 B3 11 Cable SpO2 060230 B3 12 Switch panel 046787 B4 13 Plate display back 047379 B5 14 Display LCD 047377 B5 15 Bezel front 049623 B5 NPB 4000C 1 Knob 044727 A1 5 SpO2 module 046085 B2 6 Connector cable ECG temp 047376 B2 7 Encoder 291186 B2 8 PCB main 049591 B3 9 NIBP fitting and tubing 047375 B3 10 Inverter backlight 049621 B3 11 Cable SpO2 060230 B3 12 Switch panel 04...

Page 72: ...Section 7 Spare Parts 7 6 Figure 7 3 NPB 4000 C Front Case Assembly Diagram Sheet 2 of 2 ...

Page 73: ...er backlight 047378 B3 11 Cable SpO2 045278 B3 12 Switch panel 046787 B4 13 Plate display back 047379 B5 14 Display LCD 047377 B5 15 Bezel front 049589 B5 NPB 4000C 1 Knob 044727 A1 5 SpO2 module 046085 B2 6 Connector cable ECG temp 047376 B2 7 Encoder 291186 B2 8 PCB main 049591 B3 9 NIBP fitting and tubing 047375 B3 10 Inverter backlight 047378 B3 11 Cable SpO2 060230 B3 12 Switch panel 046787 B...

Page 74: ...Section 7 Spare Parts 7 8 Figure 7 4 NPB 4000 C Rear Case Assembly Diagram Sheet 1 of 2 ...

Page 75: ... C1 18 Battery 047384 C1 19 Housing battery 047381 C2 20 Speaker 047387 C2 21 PCB printer 047388 C2 26 Cable main ribbon 047391 C4 27 Case Rear 047393 C4 NPB 4000C 3 Printer module 060480 A3 4 Plate printer blanking 047386 A3 16 Cover battery 047382 C1 17 Pads battery 047383 C1 18 Battery 047384 C1 19 Housing battery 047381 C2 20 Speaker 047387 C2 21 PCB printer 047388 C2 26 Cable main ribbon 0473...

Page 76: ...Section 7 Spare Parts 7 10 Figure 7 5 NPB 4000 C Rear Case Assembly Diagram Sheet 2 of 2 ...

Page 77: ...ng battery 047381 C2 20 Speaker 047387 C2 21 PCB printer 047388 C2 26 Cable main ribbon 047391 C4 27 Case Rear 047393 C4 è Power Supply Assembly 049622 C6 NPB 4000C 3 Printer module 060480 A3 4 Plate printer blanking 047386 A3 16 Cover battery 047382 C1 17 Pads battery 047383 C1 18 Battery 047384 C1 19 Housing battery 047381 C2 20 Speaker 047387 C2 21 PCB printer 047388 C2 26 Cable main ribbon 047...

Page 78: ...Section 7 Spare Parts 7 12 Figure 7 6 NPB 4000 C Power Supply Heat Sink Assembly Diagram ...

Page 79: ...IBP 047389 C4 26 Cable main ribbon 047391 C4 Some of the accessories available for the NPB 4000 C are listed below Table 7 7 NPB 4000 C Accessories NPB Part No Description CE 10 ECG cable LE 3SI ECG leads IEC color code LE 3SN ECG leads AHA color code ASP3 Oxisensor II sensor assortment pack DS100A Durasensor oxygen transducer EC 8 SpO2 sensor extension cable SHBP 10 NIBP hose 902096 Printer paper...

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Page 81: ...thorization RGA number Mark the shipping carton and any shipping documents with the returned goods authorization number 8 2 REPACKING IN ORIGINAL CARTON If available use the original carton and packing materials Pack the monitor as follows 1 Place the monitor and if necessary accessory items in original packaging 2 Place in shipping carton and seal carton with packaging tape 3 Label carton with sh...

Page 82: ...Section 8 Packing for Shipment 8 2 5 Seal the carton with packing tape 6 Label the carton with the shipping address return address and RGA number if applicable ...

Page 83: ...waveform data as well as trends in graphical and tabular format An optional printer provides for hard copy recording 9 2 GENERAL Size 10 6 in x 8 6 in x 6 5 in 26 9 cm x 21 8 cm x 16 5 cm excluding handle Weight 10 8 lb 4 9 kg excluding accessories options cables Display NPB 4000 Screen Type Liquid Crystal Display LCD Monochrome Cold Cathode Fluorescent Backlit Screen Size 151 mm x 113 mm Resoluti...

Page 84: ...to 240 VAC 50 Hz to 60 Hz 1A max DC External 10 VDC to 16 VDC 5A max 9 4 ENVIRONMENTAL Mechanical Shock IEC 68 2 27 100g 6 msec three axes 18 total shocks nonoperating Mechanical Vibration Sinusoidal IEC 68 2 6 10 Hz to 58 Hz 0 15 in displacement 58 Hz to 150 Hz 2g acceleration 4 min sweep 20 sweeps axis nonoperating Temperature Operating 0 º C to 50øC Storage 20 º C to 60øC Humidity Operating 5 R...

Page 85: ...C 300 mV DC Defibrillator Discharge 5 sec per IEC 601 2 27 Recovery 8 sec per AAMI EC13 1992 Standards Meets the performance standards of ANSI AAMI EC13 1992 Instead of a 1 mV standardizing voltage section 3 2 2 9 a fixed 1 cm reference bar is always present in the ECG display along with the ECG size setting expressed in mV cm The following information references particular sections of ANSI AAMI E...

Page 86: ...the monitor will reject all pacemaker pulses having amplitudes of 2 to 700 mV and pulse widths from 0 1 to 2 ms with and without under overshoot Following are pacer pulse conditions that the monitor will reject but are less than the maximum range listed in the standard Pacer pulse width 2 ms double pulse without over undershoot no QRS Pacer amplitude 300 mV Pacer pulse width 2 ms single and double...

Page 87: ...top switch STAT Series of consecutive measurements for 5 minutes Cuff Pressure Display 10mmHg to 300 mmHg Blood Pressure Measurement Range Systolic 60 mmHg to 250 mmHg Mean Arterial Pressure 30 mmHg to 235 mmHg Diastolic 20 mmHg to 220 mmHg Pulse Rate Range 20 BPM to 200 BPM Blood Pressure Accuracy Mean error and standard deviation per ANSI AAMI SP10 1992 Pulse Rate Accuracy Greater of 2 BPM or 2 ...

Page 88: ...r II D 25 sensors 9 6 TRENDS Types Graphical and Tabular Memory Storage 12 hours nonvolatile Data interval 20 seconds Stored data point is the average over 20 second interval Graphical Format One graph per vital sign Display range 2 hours scrollable Vertical Scaling Heart rate 50 BPM to 100 BPM 0 BPM to 250 BPM 25 BPM to 125 BPM NIBP 50 mmHg to 100 mmHg 0 mmHg to 150 mmHg 0 mmHg to 300 mmHg SpO2 0...

Page 89: ...udible alarm signals when settable limits are violated Creating and displaying warning messages when conditions are detected that would degrade or prevent valid measurements Creating and displaying trend waveforms or tabular data Providing a synchronizing pulse for defibrillator operation Providing input to an optional recorder for printout of current or trend waveforms or tabular data The monitor...

Page 90: ...roprocessor computation and control circuitry 10 2 2 NIBP Front End The NIBP section contains the pumps valves pressure measurement circuitry and control circuitry for the noninvasive blood pressure measurement Pressure data is converted to digital format and conveyed to the processor section 10 2 3 Power System The power system section contains a power supply capable of operating the monitor and ...

Page 91: ...sor and to the system power supply Pressing this switch turns off the battery fuse alarm in the system power supply Response of the processor depends upon the action in pressing this switch If momentarily pressed less than 2 seconds alarms are silenced temporarily for a preset interval determined by the menu selection If held pressed for 2 seconds or more the Alarm Suspend condition is initiated T...

Page 92: ...er variables 10 2 8 RS 232 I O This is a rear panel 9 pin connector providing interfaces with other computer systems or equipment The driver for this port is a Universal Asynchronous Receive Transmit UART integrated circuit that interfaces this port with the microprocessor The baud rate for this serial transmission function is programmable from 1200 baud to 38 4 kilobaud One pin 9 of RS 232 connec...

Page 93: ...ay to print a snapshot recording when an alarm condition occurs Printing is accomplished on 50 mm wide thermal paper at printer speeds programmable up to 50 mm sec 10 3 ECG PROCESSING The technique used in ECG senses the varying potential difference between two points at the skin surface which respond to the chemical actions of the muscular activity of the heart Three electrodes are attached to th...

Page 94: ...ean arterial pressure The point at which the system detects a rapid decrease in oscillation is defined as the diastolic pressure 10 6 SPO2 PROCESSING Measurement of oxygen saturation in the blood uses a specrophotometry technique It is based on the facts that oxyhemoglobin and deoxyhemoglobin differ in the their absorption of red and infrared light and that the volume of arterial blood in tissue c...

Page 95: ...anufactured by Yellow Springs Incorporated Interchangeable probes in this series may be used for esophageal rectal skin or surface or airway temperature measurement Probes are furnished with a standard 10 feet lead extension leads are available The signal from the probe is conditioned by the monitor input circuitry processed and used to drive the numeric display ...

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Page 97: ...1 1 BLOCK DIAGRAM See Figure 11 1 The simplified block diagram of the previous section has been reproduced and highlighted to indicate the circuit block that will be described in some detail in the paragraphs that follow As shown the selected block is the isolated Front End circuitry This block contains the interfaces with the patient connections at the input and delivers an isolated output to the...

Page 98: ...lated side It also carries an SpO2 module which uses Front End for isolation and power supply The ECG channel has 3 lead capability and a gain of 285 It provides two levels of low frequency noise filtering T wave filtering R wave detection pacer detection capability and baseline reset The temperature channel provides measurements over the range of 15 to 45øC using YS400 series probes The respirati...

Page 99: ...hing driver and an isolated transformer provide 100 kHz AC power to the isolated side An A D converter on the non isolated side digitizes signals coming from the linear optocoupler line as well as three signals from the NIBP circuit and other analog signals such as samples of power supply voltages on the non isolated part An expanded block diagram of the Front End is presented in the Figure 11 3 F...

Page 100: ... the current limited to approximately 2 5Amps by two 1 kilo ohm 1W resistors installed in a standard ECG cable The same suppressers will clamp ESD voltages close to 80 volts relative to isolated ground The R C networks R278 C162 R279 C164 R254 C150 R261 C157 R247 C148 R246 and C146 provide further voltage and current limiting to the levels safe for inputs of the multiplexers having their own over ...

Page 101: ...cted to the inputs of the instrumentation amplifier U80 configured to have a gain of four A common mode signal at the amplifier input is measured by the amplifier U75B and used to drive the patient body via the amplifier U75A resistor R291 and multiplexer U78 so that the common mode signal on the body and the output of the preamplifier would be eliminated The amplifier U75B is also used for drivin...

Page 102: ...er with U71A amplifier has the center frequency of 14 Hz and the passband of 5 Hz This filtering should eliminate false triggering in case of tall T wave following R wave The signal is rectified by the full wave rectifier made of amplifiers U71B and U71C and dual diode D13 This signal is used as one input to the comparator U74D Sample and hold circuit consists of amplifier U71D diode D17 capacitor...

Page 103: ...e a synchronous detector The DC component of the filtered signal is removed by 0 1 Hz high pass filter C134 C172 R205 and R204 and the remaining low frequency respiration signal is fed for further amplification The capacitors C134 and C172 can be quickly discharged through U63D switch under software control in case of significant baseline drift Amplifier U72B has a gain of 667 and creates 2 5 volt...

Page 104: ...o operational amplifiers U60 and U51 Input current set by multiplexer output and resistor R166 is compared by U60 with the current of input photodiode The LED is controlled by U60 until two currents are equal The current of the output diode mirrors the input diode s current thus producing an image of the multiplexer voltage at the output of U57 Operational amplifiers maintain very close to zero im...

Page 105: ...etriggerable multivibrator U62A for the duration of 130 microseconds The stream is 16 bits long and each pulse retriggers the one shot At the end of the stream and after a 130 microseconds time out the parallel set of bits representing the last eight bits in the serial stream will be latched in an eight bit buffer The bits represent different control functions A group of three bits MuxA MuxB and M...

Page 106: ...le The converter has four control lines ADCS CS ADCRX DATA OUT ADCTX DATA IN and ADCCLK I CLK Clock rate is set at 25 kHz Each control burst is 16 bits long The first eight bit encode control information for the converter MSB first is four bit analog channel address D7 D4 two bit data length select D3 D2 output format MSB or LSB first encode D1 and unipolar or bipolar output select D0 The last eig...

Page 107: ...ess Bits D7 D6 D5 D4 LS1 LS2 LSBF BIP Inputs AIN0 Isolated data 0 0 0 0 AIN1 NIBPPSR1 0 0 0 1 AIN2 NIBPPSR2 0 0 1 0 AIN3 OSC 0 0 1 1 AIN4 VBATTAD 0 1 0 0 AIN5 TEMAD 0 1 0 1 AIN6 3 3VAD 0 1 1 0 AIN7 12AD 0 1 1 1 AIN8 24AD 1 0 0 0 AIN9 NC 1 0 0 1 AIN10 NC 1 0 1 0 Internally connected inputs Vref Vref 2 1 0 1 1 Vref 1 1 0 0 Vref 1 1 0 1 Software power down 1 1 1 1 Output data length 8 bits 0 1 12 bit...

Page 108: ...y the main power supply 12 volts regulator 11 11 SPO2 BOARD The SpO2 board MP 205 plugs into the main board and uses it for power supply and isolation The SpO2 input signal through D type panel connector and Front End connector J101 is fed to the receptacle J100 power control and output signals go to the receptacle J10 Two output signals are asynchronous serial link RX and TX Serial TX controls op...

Page 109: ...olved from the major circuitry dedicated to the NIBP functions 3 Lead ECG Temp 1 Isolated Front End EKG Resp Temp SpO2 Circuitry SpO2 uP Memory and Control Circuitry Keypad Switches Display Front End NIBP Circuit NIBP Defib Sync RS 232 I O Speaker Printer I O Power System Battery DC In AC Line In LNA Power Figure 12 1 NPB 4000 C System Block Diagram The major blocks involved from the cuff to the m...

Page 110: ...og signals to the digital hardware where they are digitized and processed to obtain systolic diastolic and mean blood pressure values as well as the beat rate The technique for translating the pressure signals into the required measurements makes use of the action of the oscillatory characteristic of the returning arterial pressure The phenomenon is illustrated in the diagram below See Figure 12 3...

Page 111: ...ay valve In the V1 deenergized position the portion of the pneumatic system encompassing the cuff and pump are open to the atmosphere thus preventing the cuff from being pressurized In the V1 energized position the cuff and pump are connected to V2 and the pressure transducers When V2 is closed action of the pump will pressurize the cuff Control valve V2 is used to bleed pressure from the cuff dur...

Page 112: ... pump and valve enable signal that is generated in U16 7 level detector amplifier circuit One input to that amplifier is the NIBPRSR2 signal from transducer P2 The other is a value determined by voltage divider R68 and R64 and feedback resistor R61 The pump and valve drivers are enabled only when cuff pressure is below nominal 330 mmHg for adult mode and below 165 mmHg for neonatal measurements 12...

Page 113: ...the pump is fully off As the duty cycle increases from 0 to 100 percent the pump power changes smoothly from full OFF to fully ON This control technique minimizes overshoot of the targeted pressure Diode D32 suppresses voltage spikes while R78 ensures that Q18 will be OFF if the line opens Resistor R77 and capacitor C46 suppress motor brush noise 12 3 7 Digital Signal Processing and Information Di...

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Page 115: ... board DMA unit The LCD display is a 640x480 black and white display that is connected to an S MOS 1351FLB controller chip This chip interfaces via the data bus to the 386EX It has two 32kx8 SRAMs for data storage The backlight is controlled by enabling 12 volts to the inverter board The contrast for the LCD is controlled from the onboard 24 volts The main executable memory is a 256Kx16 flash memo...

Page 116: ...NS Figure 13 1 Power Supply Interface See Figure 13 1 The power supply system provides the power for the main board and all of the circuitry in the system It also contains control circuits for turning on and off the power as well as supplying the battery backup for the system 13 2 1 Voltages The microprocessor and its associated circuits are powered from the regulated 3 3 volts generated on the po...

Page 117: ... generate two LED driving signals one that indicates that the AC mains is connected and one that indicates that the DC power is connected When the AC Mains LED is being driven on a high voltage level goes to the 386EX port 1 bit 6 as the AC mains input status bit When the LED is off the signal is a logic low The software will interpret the signal levels so as to tell whether the AC mains is connec...

Page 118: ...sducer 1 is used for the main cuff pressure signal from which blood pressure results are calculated Transducer 2 is used as the backup cuff pressure signals from which over pressure warnings are obtained These pressure voltages go to the A D converter and are monitored by the software 13 3 3 Oscillatory Signal Transducer 1 s signal is also filtered and amplified to separated cuff pressure oscillat...

Page 119: ...bit register in the FPGA which outputs a high pulse level for a programmable time then a low level for a period of time The high level is programmed by the software and the FPGA circuit automatically generates the low portion of the signal When this signal is low the valve is fully closed As the duty cycle of the PWM is varied from 0 to 100 percent the valve changes smoothly from fully closed to f...

Page 120: ...transferred to the UART which will transmit serially to the recorder The UART generates RS 232 signals in TTL CMOS compatible signal levels The recorder takes 0 5 volt signals so each of the signals to from the recorder must be translated from to 3 3 volts 5 volts This is done with the HCT244 buffers The UART signals and recorder signals are listed below Host transmit printer receive printer reset...

Page 121: ...d timer channel 0 to work together to transfer control words to the A D and Front End The timer is set for a rate of 800 Hz and its output is programmed to go directly to the DMA unit The DMA unit passes data from the DRAM to the SSIO unit which in turn transmits the 16 bit word to the A D and the Front End The first eight bits transmitted are stored by the A D and interpreted A conversion starts ...

Page 122: ...ts it to the SpO2 13 5 5 ISOLATED FRONT END POWER SIGNALS The isolated Front End requires its own power supply and voltages separate from the other voltages in the system The FPGA generates a 100 kHz signal that connects to an isolation transformer These signals are enabled disabled by a bit in the CS5 control register These signals are also connected to and in synchronization with the 50 kHz powe...

Page 123: ...CD controller RTC address data mux DRAM address mux and the boot and trend flashes Six address lines go to the FPGA The data bus connects to the data bus buffers which in turn connect to the DRAM RTC DUART boot flash trend flash LCD controller and the FPGA The address and data control signals are distributed to the FPGA DRAM RTC LCD controller boot and trend flashes and DUART RESET comes from the ...

Page 124: ... wait states associated with each of the CSU s selects and they are defined as follows CS0 read write six wait states CS1 read write six wait states CS2 read write four wait states CS3 read wrote 18 wait states CS4 read write two wait states CS5 read write no wait states CS6 read write one wait state UCS read two wait states write four wait states 13 7 5 Timer Unit The timer unit has three timers ...

Page 125: ...e 16th clock it will activate the EOC signal that turns off the STXCLK signal The A D makes a conversion and passes the data back the next time it receives the STXCLK signal The SRXCLK signal is connected to the STXCLK and each time a new conversion is initiated the previous conversion s data is transferred to the 386EX via the SSIORX data line 13 7 8 Asynchronous Serial Port There are two asynchr...

Page 126: ...PH1 PH2 ADS W R BLE BHE CSO 6 UCS D C M IO A1 25 RD WR LBA READY D0 15 Figure 13 7 CPU Signals 13 8 DRAM Control The DRAM control consists of one 256kx16 DRAM chip three 74ACT157 address mux chips address resistors and the FPGA control circuit The CS6 a low true signal signal has been assigned to the DRAM memory address space 0 3FFFF words or 0 7FFFF bytes The CS6 control register in the chip sele...

Page 127: ... wait state for each DRAM access and a total of three T states which is 150 nanoseconds Since the DRAM minimum access time is 130 nanoseconds we have 20 nanoseconds of margin The Hitachi HM51W4260AL has a RAS time of 70 nanoseconds a precharge time of 50 nanoseconds a CAS time of 20 nanoseconds and a WE time of 15 nanoseconds The BLE and BLH signals are used to select byte oriented reads and write...

Page 128: ...resh 13 9 Flash Control The flash memory and control consists of two flash chips a bootable flash also called the executable flash and a trend flash The control consists of the random logic in the FPGA The bootable flash is a 256Kx16 Intel part no E28F400BVT60 or Micron part no MT28F400 SG 8 flash with the boot in the top section T and is preprogrammed on the data I O or some other unit with the b...

Page 129: ... external devices See Figure 13 10 The read cycle time for the executable flash is 110 nanoseconds The write pulse width must be at least 150 nanoseconds Refer to the timing diagrams for the flash for minimum timing parameters T1 25NS 25NS T2W T2W T2 CLK2 PH2 FLSHCE FLSHRD 50NS 50NS 50NS 50NS Figure 13 10 Flash Cycle In the FPGA control logic the executable flash chip select is anded with the tren...

Page 130: ...y Typical worst case write erase times for 64 bytes is less than 1 second 13 10 LCD Display The LCD display is a black and white B W 640x480 pixel display used as a 1 bit pixel B W display Gray shading is not used in this display It is a dual panel dual drive unit and the 1351 drives the display directly It operates from 3 3 volts The LCD display is divided into two sections each section is 640x24...

Page 131: ...ct signal It is connected to CS1 directly and display data is transferred to the display ram using this address space IORD IOWR MEMRD and MEMWR are used to read and write to from the control registers and the display memory The two read signals are connected directly with the RD signal from the 386EX The two write signals are connected directly with the WR signal from the 386EX The MPUCLK is conne...

Page 132: ...d lower display panels The XSCL is the data shift clock and the LCD display stores the data on the falling edge of this clock The LP signal is the latch pulse and is used to latch the data into the X drivers The YD signal is the frame pulse which indicates a start of frame 13 10 3 LCD FPGA Control Circuits The LCD display chip interfaces directly with the 386EX The only circuit that is necessary t...

Page 133: ...one by assigning CS4 to the DUART I O space with four addresses assigned to each UART The DUART channel 0 is the base address assigned to CS4 and the channel 1 address is the base address 8 A3 There are four addresses assigned to each UART 0 1 2 and 3 Software must program two wait states for CS4 and define them as a byte device A state machine in the FPGA is used to generate the proper signals fo...

Page 134: ...in the status register The software debounces and detects the length of time the switch is depressed The software determines which switch was depressed by reading CS5 A bits 4 through 7 13 15 MISCELLANEOUS CONTROL CS5 The NIBP PUMP PWM NIBP VALVE PWM SPEAKER FREQUENCY DUTY CYCLE and a miscellaneous control register are all assigned to the I O space programmed to CS5 The addressing scheme is as fol...

Page 135: ...egin the tone frequency Software has complete control over the duty cycle of this tone by programming the high and low values and being able to select the clock frequency for the counter The TONE_OUT signal is low until the low counter overflows and sets the TONE_OUT flip flop high Now the high counter is enabled and the TONE_OUT signal stays high until the high counter overflows at which time it ...

Page 136: ...Bit 1 Not used Bit 2 Not used Bit 3 Knob push button switch Bit 4 Knob channel B rotation Bit 5 Knob channel A rotation Bit 6 Push Button occurred Bit 7 Knob rotation occurred 13 15 5 CS5 C Write Enables WDT READ Push Buttons After powering up the software must enable the watch dog timer function by writing to this register The act of writing to CS5 C automatically sets the WDT flip flop to a 1 an...

Page 137: ...e 2 wherever necessary Page 1 of the schematics is mostly the digital portion of the design It contains the following chips 386EXMP microcontroller ACT1000F programmable device with the control circuits LCD CONTROLLER 1351FLB LCD display control chip 74HCT244 buffer chips for the signals from the LCD controller to the display itself 74LVC16245 data bus buffer to interface the 386EX to the other ch...

Page 138: ... supply connector the defib connector and the speaker The speaker circuit consists of a software programmable digital potentiometer chip U28 which is a Dallas DS1666S 10 The software sets the tone frequency by setting the high register with a value setting the low register with a value then programming the digital potentiometer up down according to the timing specified in the requirement specifica...

Page 139: ... using the maximum numbers in the data sheets of the devices Typically the devices operate significantly lower 386EX 130 mA 4M DRAM 95 mA 4M FLASH 30 mA LCD CNTLR 20 mA 256k SRAM 50 mA x2 100 mA DUART 3 mA RS232 XCVR 5 mA 256k FLASH 15 mA RTC 15 mA 40MHz osc 9 mA Subtotal 422 mA misc logic 78 mA Grand Total 500 mA Available Power 3 3 volts x 500 mA 1 65 W ...

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Page 141: ...is design has a Vcc 3 3 volts The data from the front end ECG temperature respiration etc is multiplexed through a linear opto isolator to a 12 bit A D converter which is connected to the on board synchronous serial port The synchronous serial port is controlled by the on board DMA unit The LCD display is a 640x480 TFT color display which is connected to an S MOS 1354F0A controller chip This chip ...

Page 142: ...mmable digital potentiometer The software controls the volume by programming this digital pot The DEFIB SYNC pulse is bit programmed via software and goes to the outside world via a digital driver The DEFIB SYNC pulse s purpose is to indicate on the leading edge that now is the time to fire the defibrillator The NIBP circuit is controlled by various port bits and control circuits in the ASIC It au...

Page 143: ...3 3 volts DC generated on the power supply board The 3 3 volts DC powers the microcontroller DRAM flash LCD controller and a portion of the LCD contrast circuit memory the DUART and real time clock The 5 volts DC powers the Nellcor knob the TFT color display and a portion of the speaker circuit The A D converter is powered by its own 5 volt regulator The 12 volts DC powers the speaker circuit the ...

Page 144: ...te two LED driving signals one that indicates that the AC mains is connected and one which indicates that the DC power is connected When the AC MAINS LED is being driven on a high voltage level goes to the 386EX port 1 bit 6 as the AC mains input status bit When the LED is off the signal is a logic low The software will interpret the signal levels so as to tell whether the AC mains is connected or...

Page 145: ... trend flash U14 Six address lines go to the FPGA U505 The 386EX s data bus connects to the data bus buffers which in turn connect to the DRAM U501 RTC U4 DUART U24 boot flash trend flash LCD controller and the FPGA The 386EX s control signals are distributed to the FPGA DRAM RTC LCD controller boot and trend flash and DUART Reset to the 386EX is generated in the FPGA CLK_40MHZ is a 40 MHz signal ...

Page 146: ...converter TIMEROUT0 Speaker volume adjust pulse TIMEROUT1 DMA request for initiating an A D conversion TIMEROUT2 100 kHz output to the FPGA for generating the 100khz and 50 kHz signals for the power supply 14 3 6 INTERRUPTS There are 2 interrupts used INT2 DUART channel 0 interrupt INT5 Early warning from the power supply 14 3 7 SYNCHRONOUS SERIAL UNIT The synchronous serial port is connected to t...

Page 147: ...e signal 14 3 9 WATCH DOG TIMER UNIT WDT The watchdog timer unit within the 386EX has one output which goes to the FPGA 14 4 LNA 386EX CONNECTIONS Figure 14 2 LNA 386EX CONNECTIONS 14 5 CPU TIMING SIGNALS The 386EX runs from a 40mhz crystal oscillator and the main timing is derived from this clock It is called CLK_40MHZ Inside the CPU CLK_40MHZ is divided by 2 generating two new clocks PH1 and PH2...

Page 148: ... circuit CS6 a low true signal has been assigned to the DRAM memory address space 0 100000 words or 0 200000 bytes The CS6 control register in the chip select unit CSU must be programmed for 1 WAIT STATE Since the data bus is 16 bits wide and the DRAM is a x16 part most transfers will be of the 16 bit variety However 8 bit transfers are allowed and we have made provisions for byte addressing This ...

Page 149: ...which is 150 ns Since the DRAM minimum access time is 104 ns we have 46 ns of margin We are using the Hitachi HM51W18165LTT or equivalent which has a RAS time of 60 ns a precharge time of 40 ns a CAS time of 10 ns and a WE time of 10 ns The BLE and BLH signals are used to select byte oriented reads and writes There are 2 CAS lines which are used to implement the byte writes The RAS and CAS require...

Page 150: ...boot program The executable program can also be programmed this way or by downloading it to the 386EX via the RS 232 connection The trend flash consists of Atmel AT29LV256 32kx8 devices which stores the trend data and which writes 64 bytes at a time It takes 1 wait state for reading the executable 2 wait states for reading the trend and 4 wait states to write either of these flashes 14 7 1 EXECUTA...

Page 151: ... flash is connected directly to CS2 because it has priority over the executable if an overlapping addressing scheme is used The write pulse width is generated via a state machine to give the proper pulse width Figure 14 7 Flash Write Timing 14 7 2 FLASH FPGA CONTROL CIRCUIT The FPGA decodes the boot flash and trend flash select signals and generates the boot flash FLSH1CE signal whenever the trend...

Page 152: ...r 16 bits per pixel and it was very inexpensive The SED1354 supports either a 50 ns or 60 ns access time DRAM The 60 ns access time is used The LCD display interfaces to the S MOS LCD controller chip SED1354F0A through some 74HCT244 buffers This controller chip is connected to the 386EX and one 1MX16 EDO DRAM The LCD controller has control registers which must be setup by software before writing t...

Page 153: ...d WE1 are low it indicates that Data Bits 15 0 are being written to the 1354 RD is generated by anding BLE and RD of the 386EX and it comes out of the FPGA pin 59 RD WR is generated by anding BHE and RD of the 386EX and it comes of the FPGA pin 60 WE0 is generated by anding BLE and WR of the 386EX it then gets synchronized with a flip flop WE0 is on pin 56 of the FPGA WE1 is generated by anding BH...

Page 154: ... to the DRAM The LCD display interfaces directly with the SED1354 through the 74HCT244 buffers The signals used are DRDY FPFRAME FPLINE FPSHIFT and FPDATA 15 0 The FPLINE signal is the line pulse which indicates the start of a line It is an active low signal The FPFRAME signal is the frame pulse which indicates a start of frame It is an active low signal FPSHIFT is the data shift clock and the LCD...

Page 155: ...urned on and off by a digital control bit in the FPGA Control Register When power is applied it is reset to 0 The backlight requires an AC high voltage which is generated by an inverter which takes 12 volts DC and generates the AC voltage When software wants the backlight on it sets this bit and it turns on FET Q1 which completes the circuit to ground and allows the inverter to generate the AC vol...

Page 156: ...ssigned to the recorder The FIFOS are 16 bytes deep and transfers to from the DUART would save time if done on 8 or 16 byte boundaries Interfacing to the DUART is done by assigning CS4 to the DUART I O space with 4 addresses assigned to each UART The DUART channel 0 is the base address assigned to CS4 and the channel 1 address is the base address 8 A3 There are 4 addresses assigned to each UART 0 ...

Page 157: ...BUTTON CONTROL There are 5 push button switches and one knob push button switch All of these push buttons go to the FPGA control circuit except for the ON OFF push button which goes directly to the power supply control circuit Each of the push button circuits have a debounce resistor and capacitor associated with them and then go to the FPGA The signals ALRMSIL NIBPPB AUDTONVOL LCDCONTRST and KNOB...

Page 158: ...signal is generated this way until it is shut off by resetting the VALVE_PWM_GO bit in the CONTROL REG The same register is used for both PWMs because they are mutually exclusive and software uses only one at a time 14 13 2 CS5 4 SPEAKER HIGH CS5 6 SPEAKER LOW VALUE The speaker tone frequency is generated using two 8 bit registers one which is the value for the high portion of the frequency and on...

Page 159: ...ONS The I O address of CS5 6 has 2 functions associated with it Writing to this register generates a KNOB_INT_RST signal which resets the knob interrupt flip flops This would be done by software after a knob interrupt occurs The software polls this register every 50 ms and looks to see if the PB_INT bit bit 6 or the KNOB_INT bit bit 7 is set true indicating that a button has been pressed or the kn...

Page 160: ...5 E as explained above 14 14 SPEAKER The speaker circuit consists of an 8 ohm speaker driven by a circuit which consists of U26 U27 Q12 Q13 and some discrete resistors and capacitors U26 is a logarithmic potentiometer which is set by software Pulses are sent to this potentiometer from a timer in the processor and these pulses turn the volume up and down A tone is generated by programming the regis...

Page 161: ...king blood pressure measurements the cuff is placed around the arterial location of an upper arm left or right The NIBP measurement system is initiated by commands responding to pressing the NIBP switch on the front panel The cuff is inflated at a rate controlled by the pump excitation current to a pressure above diastolic at which level the artery is effectively occluded Then as the cuff pressure...

Page 162: ...ontrol are defined as described in the following text Figure 14 12 Pneumatic Assembly Block Diagram Control valve V2 is used to control the rate of deflation The smoothly variable opening of the valve is controlled by the valve excitation current 3 Way valve V1 is either fully ON or fully OFF It performs two functions 1 It dumps the remaining pressure from the cuff at the end of the deflation cycl...

Page 163: ...t separates and amplifies the oscillatory signals OSC from the deflating cuff transducer signal NIBPRSR1 Amplifier U16 8 provides hysteresis 14 15 1 2 3 Power Supplies Battery power VBATTP connected to the board at J3 pins 13 and 14 is regulated in U15 when that component is enabled by the NPANPWR analog power On Off signal input to U10 4 The regulator accepts a battery voltage of 6 to 8 volts and...

Page 164: ...lt protection the pump requires two signals PUMPON and PVENB to activate the pump PUMPON when high turns on FET Q18 that pulls the bottom lead of the motor to ground PVENB through level translator Q19 turns on FET Q17 that pulls the top motor lead to VBATT When no voltage is present at Q18 the pump is fully OFF As the duty cycle increases from 0 to 100 the pump power changes smoothly from full OFF...

Page 165: ...smits to the SSIO the previous conversion s data and the front end changes it s multiplexer to the new input channel Since the A D converter has its own sample and hold once the conversion begins the input to the A D can change without affecting the conversion Thus the front end sets up for the next conversion the A D starts a conversion and the A D also transmits the previous conversion s data On...

Page 166: ...ircuits and some additional circuits which need explanations The schematic contains the following chips 386EXMP microcontroller 42MX09 programmable device with the control circuits LCD CONTROLLER 1354F0A LCD display control chip 74HCT244 buffer chips for the signals from the LCD controller to the display itself 74LVC16245 data bus buffer to interface the 386EX to the other chips RTC DS1693 real ti...

Page 167: ...4 POWER SUPPLY SYNC ALARM control 15 A D CONVERTER SERIAL CLOCK control 16 LCD control 14 17 2 DRAM CONTROL CIRCUIT The DRAM control circuits consist of a small state machine to generate RAS LCAS UCAS DRAMOE WRITE CASADREN FDRRD and ENDTABFR The process of reading writing and refreshing the DRAM is controlled by these circuits Each portion of the circuit is described below RAS Row Address Strobe i...

Page 168: ...the RAS2FF is set 25 ns after that and the RAS3FF is set 25 ns after that It takes another 75 ns for each of these flip flops to turn off and this extends into the first T state of the next cycle If it is a valid cycle everything is OK If however it is an idle state then the state machine just continues to turn back on because CS6 remains low during the idle state even though it s not doing a DRAM...

Page 169: ... true LCD_MEM_SEL is false and D_CB is high indicating a data operation As a note a WRITE must be generated in glue logic because various memory and peripheral chips require a hold time when writing data to it The 386EX turns the WR signal off at the end of the last T2 state of a cycle When this happens the data bus buffer is also turned off and the data lines go into a tri state condition This ca...

Page 170: ... DOG TIMER ENABLE The WDT output from the 386EX is anded with a 50 kHz signal which is derived from the 100 kHz output of timer 2 of the 386EX When powering up the WDT is not in the correct mode of operation until the software programs it Therefore to prevent the power supply from shutting down prematurely the WDTENFF must be set high after the WDT has been programmed Writing to address 30C automa...

Page 171: ...nd CLK_PH2 always follows CLK_PH1 and is the inverse of CLK_PH1 These clocks are 50 percent duty cycle clocks running at 20 MHz 50 ns period Each T state of the processor is composed of 2 phases or clock states first CLK_PH1 then CLK_PH2 and is 50 ns long 14 17 11 READY CIRCUIT The READY circuit is complicated by the fact that either the processor or an external peripheral can generate the READY s...

Page 172: ...RTCAND gate which ands RTC_SEL low and RTCS8 low ENDTABFR goes low at the start of state 9 by anding RTCS9 low and RTCS8 high During the time ENDTABFR is high the address is enabled by RTC_ADREN which is generated when RTCS2 is high and while RTCS8 is low At this same time RTC_ALE is generated between states 1 and 5 latching the address into the RTC When state 9 is reached either a read or write h...

Page 173: ...lid and to meet the maximum delay from WR0 low to data valid of the 1354 The flip flop will become cleared when ADS goes low for the start of the next cycle The output signal is called LCD_LWR This signal comes from pin 56 of the FPGA and goes to pin 8 of the 1354 The WR1 is generated by an AND gate and a flip flop The AND gate is anding BHEB with WRB The flip flop is used to delay the WR1 The rea...

Page 174: ...ter and are mutually exclusive The software loads a value into the 8 bit holding register The counter is clocked by a 313 kHz clock and on all the time When the counter overflows the value in the holding register is loaded into the counter synchronously with the 313 kHz clock The counter operates as a count up then count down circuit always generating the same frequency but with different duty cyc...

Page 175: ...resetting the FREQ_GO bit in the control register 14 17 21 CONTROL REGISTER The control register is an 8 bit register with miscellaneous programmable control bits These 8 bits are programmable and can be read back via the read back multiplexer 14 17 21 1 PUMP_PWM_GO and VALVE_PWM_GO BITS The PUMP_PWM_GO is bit 0 and VALVE_PWM_GO is bit 1 These bits have been mentioned above and are used to control...

Page 176: ...ed and activated it operates in an unusual manner If new data is not ready after a transmission the serial unit will transmit the same data over again The solution is to generate the synchronous serial clock in the FPGA rather than the 386EX SSIO unit The TIMER0 S output is routed to the FPGA on pin 95 and enables a 25 kHz clock which goes out on pin 134 This is the master synchronous serial clock...

Page 177: ...are wave 14 17 25 KNOB ROTATION DETECT The rotating knob on the front of the unit has an optical interface Five volts are supplied to it and it generates 2 signal channels A and B which are input to the FPGA on pins 163 and 164 When the knob rotates clockwise the square wave on CHANNEL A leads the square wave on CHANNEL B by 90 degrees When rotating counter clockwise CHANNEL B leads CHANNEL A by 9...

Page 178: ...Section 14 Main Color Board Digital Theory of Operation 14 38 Figure 14 14 NPB 4000C Color Motherboard Block Diagram ...

Page 179: ...umbers in the data sheets of the devices Typically the devices operate significantly lower 386EX 130 mA 16M DRAM 170max2 340 mA 8M FLASH 20 mA LCD CNTLR 30 mA DUART 3 mA RS232 XCVR 5 mA 256K FLASH 15 mA RTC 15 mA 40mhz osc 9 mA subtotal 567 mA misc logic 78 mA grand total 645 mA power 3 3 volts x 645 mA 2 12 Watts worst case Typical numbers are 3 3 volts at 300 mA 0 99 Watts ...

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Page 181: ...er 90 264 volts RMS 47 63 Hz Provides safety line isolation and produces 18 volts DC at 2 amps 36 Watts for the Battery Charger Battery Charger Accepts input from either an external DC source vehicle battery of 10 16 volts DC or from the output of the AC Mains Supply 18 volts DC Provides a tailored charging profile for the NPB 4000 C lead acid 3 cell battery Includes current limiting and temperatu...

Page 182: ... OFF control from the front panel membrane switch Early Warning OFF notification to the processor board OFF on command from the processor board Alarm driver based on processor fault watch dog time out Alarm Silence from front panel NIBP Pump control from logic levels Battery Voltage transmittal to the processor board Figure 15 2 Power Supply Detail Diagram 15 2 AC MAINS FLYBACK POWER SUPPLY ...

Page 183: ...nd transferred to a load during switching cycles In the first part of the cycle the switch is closed the input voltage is applied to the inductor and current builds linearly When the switch opens the voltage at point A which was grounded flies back up until it hits the output diode The energy stored in the inductor now depletes into the load In the NPB 4000 C power supply the inductor is a transfo...

Page 184: ...n 3 supplies power through D4 for the controller The primary tap also creates the voltage on C12 which is regulated by the controller to 11 volts DC The transformer secondary is indirectly regulated by turns ratio and magnetic coupling to provide about 18 volts DC Resistor R11 and capacitor C14 set the fixed operating frequency about 100 kHz of the converter Current loop feedback enters the contro...

Page 185: ...to satisfy the load the switch is opened The current flowing in the inductor causes the input lead to fly down until it is caught by the catch diode at a voltage slightly below ground The inductor current then diminishes until the switching cycle is repeated The battery charger receives input DC either from the external DC supply 10 to 14 volts or the AC main supply which provides 18 volts DC Dual...

Page 186: ... times the recommended charged cell voltage as shown in Figure 15 6 Figure 15 6 Float Voltage vs Temperature Capacitor C42 resistor R27 and capacitor C24 provide frequency compensation for the voltage error amplifier 15 4 3 Drive Translator The switch control output of the controller does not drive the buck switch directly but through the inverting driver U3 The series buck switch is P channel FET...

Page 187: ...s 12 volts gate drive for low on resistance efficient operation so the controller IC U4 is powered from the 12 volts DC output generated by the operating supply 15 7 1 Voltage Doubler In order to get started we have a voltage doubler to pump up the battery voltage until supply operation has commenced When the PWRUP signal goes low the startup sequence begins Transistor Q12 goes on providing the ba...

Page 188: ...uce 12 5 3 3 and 24 volts DC The 24 volt winding has snubbing R35 C31 to damp secondary leakage inductance ringing 15 7 4 Control Circuits The system supply is turned ON and OFF by the PWRUP signal that controls Q11 and Q12 The supply is started when Q12 turns on powering the voltage doubler to start the controller When the supply turns OFF the voltage doubler is stopped but by that time the suppl...

Page 189: ...or U10 will begin to oscillate and will produce a positive edge on its Q14 output after about 1 second This edge will clock a low into U8 pin 11 shutting off the system supply 15 9 2 Early Warning The one second delay between the request for OFF from the push button and the actual OFF action is called the early warning delay This delay period allows the processor on the Main Board to store data an...

Page 190: ... circuitry that allows logic level control of the pump power from the processor board For single point fault protection the pump requires two signals PUMPON and PVENB to activate the pump The PUMPON signal when high turns on the N channel FET section of U15 which pulls the bottom lead of the motor to ground The PVENB signal through level translator Q19 turns on the P channel section of U15 which p...

Page 191: ...LARM pulse from the processor board This 50 kHz square wave from the processor has two purposes it synchronizes the switching frequency of the system power supply and its absence indicates a time out of the watch dog timer in the processor section Transistor Q16 produces a 5 volt pulse for synching the supply and the periodic pulsing allows Q15 to keep C49 discharged If the sync pulse disappears t...

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Page 193: ...205 This product is to be serviced only by qualified service personnel 16 2 MODULE DESCRIPTON The MP 205 is a printed circuit module containing signal processing circuits to measure oxygen saturation and pulse rate based on signals supplied by Nellcor oxygen transducers sensors connected to the host system and applied to a patient The MP 205 is built around an 80C552 microcontroller and has been i...

Page 194: ...m the power on reset RXD the receive data line to the oximetry module TXD the transmitted data line from the oximetry module U6 provides a buffer for this signal C_LOCK a hardwired timing pulse active high transmitted to the oximetry module via the host instrument from an external ECG monitor The rising edge of this pulse is used by the module to satisfy the software requirements necessary to perf...

Page 195: ...ignal from the preamp by a programmable gain the demodulator shifts the frequency down to baseband while the demultiplexer separates the IR and Red components of the signal The PGA has a programmable gain from 1 to 128 in powers of 2 The PGA output goes to the peak detectors for status monitoring and to the demodulator demultiplexer U1A5 which is internal to the Oxichip circuit for signal processi...

Page 196: ...rent exceeds 44 milliamps The over current trip level is set by passing the LED current through R10 and C9 and comparing the voltage drop to VDD 0 3 volts Components CR5 and CR6 serve as ESD protection diodes See Figure 17 2 16 10 1 References There are three voltage references on the Oxichip U1 circuit The 3 125 volt reference is used for Rcal stimulus and the high resolution A D converter refere...

Page 197: ...he data bus and the control lines CS and LE Table 16 1 Oxichip Circuit Pin Descriptions Pin Name Pin type Signal Description CS 1 DI Chip Select latches the data bus into the storage registers Connected to WR U4P3 6 LE 2 DI Latch Enable enables writing to the storage register Connected to U4 P1 1 CYCLE 3 DO Indicates whether the Oxichip circuit is in a Red or IR cycle High is Red low is IR Connect...

Page 198: ...fier 2 inverting input A1INPOS 27 AI Photodetector amplifiers 1 and 2 non inverting inputs A1INNEG 28 AI Photodetector amplifier 1 inverting input A1OUT 29 AO Photodetector amplifier 1 output VREF 3125 30 AO 3 125 volt reference output 31 AO VREF25 2 5 volt buffered reference output 32 AO VREF22 2 2 volt reference output 33 AO IR IR demodulator demultiplexer output 34 AI FI1NEG IR filter chain ope...

Page 199: ...nterconnections Check 5 volt digital power supply Check processor clock Y1 Check TXD buffer U5 Check BAUD rate jumpers Error X00 no sensor Sensor may be disconnected or damaged Cable between sensor and MP 205 may be disconnected or not functioning properly Error P00 pulse search The sensor may be improperly applied to the patient or may be damaged Try another sensor Try an SRC 2 pulse oximeter tes...

Page 200: ...ed MP 205 continues with normal operation Nonfatal error host design decides what action to take E017 Calibration already in progress MP 205 continues with normal operation Continue processing E018 Calibration request denied MP 205 continues with normal operation Continue processing E019 Communication syntax error on command sent by host command discarded normal operation continues Check command d...

Page 201: ... 9 16 18 4 SRC 2 Settings Rate 112 Light High2 Modulation LOW Remote Local RCAL 63 Figure 16 1 Preamplifier and PGA Outputs 16 18 5 Trace Descriptions CHNL 2 TP3 Primary Input Preamplifier CHNL 1 TP4 Secondary Input Preamplifier CHNL 3 TP9 PGA output ...

Page 202: ...0A 0296 16 10 16 18 6 SRC 2 Settings Rate 112 Light High2 Modulation HIGH Remote Local RCAL 63 Figure 16 2 Filter Outputs and ADC Input 16 18 7 Trace Descriptions CHNL 3 TP5 ADC Input CHNL 1 TP6 Red Filter Output CHNL 2 TP2 IR Filter Output ...

Page 203: ... 044540A 0296 16 11 16 18 8 SRC 2 Settings Rate 112 Light High2 Modulation HIGH Remote Local DC RCAL 63 Figure 16 3 MP 205 with an SRC 2 Filter Output 16 18 9 Trace Descriptions CHNL 2 TP6 Red Filter Output CHNL 1 TP2 IR Filter Output ...

Page 204: ...Section 16 MP 205 Service Manual 044540A 0296 16 12 16 18 10 SRC 2 Settings Rate 112 Light High2 Modulation HIGH Remote Local DC RCAL 63 Figure 16 4 MP 205 with an SRC 2 LED Drive Current Test at TP7 ...

Page 205: ... another suitable carton or call Mallinckrodt Technical Services Department to obtain a shipping carton Prior to shipping the device contact your supplier or your local office Mallinckrodt Technical Services Department for a returned goods authorization RGA number Mark the shipping carton and any shipping forms with the RGA number 16 19 2 Repackaging in Original Carton If available use the origina...

Page 206: ... beats per minute bpm Accuracy SpO2 1 Adults 70 100 2 digits 0 69 unspecified Neonates 70 100 3 digits Pulse Rate 20 250 bpm 3 bpm 1 Accuracies are expressed as X digits saturation points between saturations of 70 and 100 percent This variation equals one standard deviation 1SD which encompasses 68 percent of the population All accuracy specifications are based on testing the subject monitor on he...

Page 207: ... apparatus not used Patient free of injected intravascular dyes Insignificant concentration of carboxyhemoglobin and methemoglobin Sensor at a temperature between 28º C and 42ºC External illumination less than 5 000 lumens square meter typical office lighting Response mode set at Mode 1 16 20 3 Sensors 16 20 3 1 Measurement Wavelengths Red 660 nm nominal Infrared 920 nm nominal ...

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Page 209: ... Figure 17 2 MP 205 Schematic PCB Sheet 2 of 2 17 5 Figure 17 3 NPB 4000 C Power Supply PCB Sheet 1 of 2 17 7 Figure 17 4 NPB 4000 C Power Supply PCB Sheet 2 of 2 17 9 Figure 17 5 NPB 4000 C Main PCB Schematic Sheet 1 of 3 17 11 Figure 17 6 NPB 4000 C Main PCB Schematic Sheet 2 of 3 17 13 Figure 17 7 NPB 4000 C Main PCB Schematic Sheet 3 of 3 17 15 Figure 17 8 NPB 4000 C Interconnect Diagram 17 17...

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Page 211: ...Section 17 Drawings 17 3 Figure 17 1 MP 205 PCB Schematic Sheet 1 of 2 ...

Page 212: ...Section 17 Drawings 17 5 Figure 17 2 MP 205 PCB Schematic Sheet 2 of 2 ...

Page 213: ... 36 37 38 39 40 P2 1 P2 2 MAINSLED PSOFF ERLYWRN SYNC ALARM VBATSNS SPKR ON OFF DCLED PUMPON PVENB SILENCE VBATMEAS 5V 24V 3 3V 12V PWRGND SIGRTN 10K 1 R60 TP40 BAW56 D26 1 2 3 VBATSNS 12V 10UF 25V 10 C51 100K 1 R62 100K 1 R61 100K 1 R63 TP41 4049 U11 3 2 4049 U11 5 4 BAV70 D24 1 2 3 0 01UF 10 C44 VBATSNS ON OFF battery connection during original Positive Pulse 4071 U12 13 12 11 100K R83 TP45 TP44...

Page 214: ... 1 0 1UF 5 C43 DCSRC 10K 1 R46 TP32 TP34 TP31 2N4401 Q10 2 1 3 DCIN 8T 1W TO 220 3300UF 25V 10 C18 1000PF 5 C10 240 5 R17 TP19 MBR20100CT D5 1 2 3 8 TEMPCO 1K 1 R18 TP9 TP8 2N4401 Q3 2 1 3 DCSRC CVREF 10UF 25V 10 C19 2K 5 R21 1K 1 R20 10K 1 R19 TP13 TP17 TP10 TP11 2N4401 Q4 2 1 3 NC2 OUTA V OUTB INB GND INA NC1 MIC4426 U3 1 2 3 4 5 6 7 8 BAV70 D7 1 2 3 D S G IRF9Z30 Q2 1 2 3 MURS120T3 D20 1K 1 R22...

Page 215: ...13 14 16 17 18 19 20 21 22 23 24 25 26 27 28 74AC240 2 18 1 2N4403 2 1 3 2N4401 2 1 3 Y A 6 14 11 10 9 8 7 6 5 4 3 2 1 3 2 1 4 5 6 7 8 9 10 11 12 13 14 15 16 15 14 13 12 VCC GND G1 G2 74LVC541 1 19 20 10 Y A 7 13 Y A 4 16 Y A 5 15 Y A 3 17 Y A 2 18 74LVC541 6 14 1 28 WE A12 A7 A6 A5 A4 A3 A2 A1 A0 I O0 I O1 I O2 GND I O3 I O4 I O5 I O6 I O7 CE A10 OE A11 A9 A8 A13 A14 VCC TC55V328J 27 2 3 4 5 6 7 ...

Page 216: ...5V 5V 5V 5V 5V 5V 5V 5V 5V 5V NIBPCNTLVLV VBATTAD R87 TXDATA RTS GND GND GND GND GND GND GND GND GND GND ALARM_SILENCE ALARM_SILENCE ALARM_SILENCE PSOFF NPANPWR ACMAINST NIBPRSR2 LCDCNTRSTUP 5REF LCDCONTRAST AUDTONVOL LCDCONTRST PTR_CTS PTR_RXD PTR_RESET RXDATA DTR DSR CTS V DCST DC LED PB2IN PB3IN SPKR_ADJ_PLS PB4IN PUMPON SYNC ALARMSOUND LCDCNTRSTDWN ON OFF ON OFF 5VREG 5VREG 5VREG 5VREG 5VREG 5...

Page 217: ...P4 TP28 TP107 TP142 TP85 2 4K R165 TP110 U75 TP117 TP46 Q20 TP60 TP62 TP47 TP130 TP50 120PF C151 D16 TP56 TP33 100K R250 TP92 TP140 TP31 TP51 TP411 TP6 1K 1K 1K Fc 33kHz VS VS OUT REF IN IN AD620A 2 1 8 3 4 5 6 7 BAV99 1 2 3 TL034C 14 13 12 TL034C 8 9 10 MC34184D 7 6 5 TLO34C 14 13 12 OUT COM IN NJM78L05UA 1 2 3 AD706J 1 2 3 TL034C 7 6 5 BAW56 1 2 3 NO Y Z E CD4016 1 2 13 4 3 1 2 5 6 7 8 9 10 11 1...

Page 218: ... ON OFF 5V CHANNEL A CHANNEL B PB GND GND TEMP TEMP SHIELD LL NIC LC LA RA AMP 1 102153 0 MALE ESQ 107 23 G D ESQ 105 23 G D SAMTEC SAMTEC AMP 640457 6 MALE AMP 640457 8 MALE AMP 640457 8 MALE AMP 102153 3 MALE AMP 640457 4 MALE P6 P5 BATTERY 6V 8AH BEADS RECEPTACLE BEAD 6 PIN SPEAKER 2 PIN 2 PIN PUMP 2 PIN PUMP PWB INTERFACE PRINTER 50 PIN HEADER TO PRINTER 20 PIN HEADER FEMALE TO PRINTER INTERFA...

Page 219: ... TP373 1 TP392 1 JP1 1 2 3 TP369 1 10K R152 Y A U3 9 11 0 1 C7 0 1 C37 VCC GND G1 G2 74LVC541 U3 1 19 20 10 120pf C522 74AC240 U12 17 3 TP248 1 TP255 1 TP260 1 74AC240 U12 13 7 T3OUT T1OUT T2OUT R2IN R2OUT T2IN R1IN GND VCC C1 V C1 R1OUT T1IN C2 C2 V R5IN R5OUT T3IN T4IN R4OUT R4IN EN SHDN R3OUT R3IN T4OUT MAX211E U19 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 10 74AC2...

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