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Novametrix Medical Systems OXYPLETH 520A, Service Manual

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Novametrix Medical Systems OXYPLETH 520A Service Manual Download Page 44

Section 9

Electronic Theory of Operation

34

Model 520A Service Manual

5693-90-01

PRELIMINARY

The transmit signal TX1, is dedicated to communication with the Optional Analog
Module (Catalog Number 9622-01) which when connected to the rear panel
connector, provides analog representations of the SpO

2

 and Pulse Rate values, a

plethysmogram signal, and a pass through port for the RS232 connector.

The transmit output TX0 from the CPU and the Receive (RX0) and Clear To Send
(CTS*) inputs to the CPU are connected to the rear panel RS232 connector.

Summary of Contents for OXYPLETH 520A

Page 1: ...520A June 5 2001 Catalog Number 5693 90 01 Novametrix Medical Systems Inc Wallingford Connecticut U S A 06492 Copyright 1992 2001 All rights reserved No part of this manual may be reproduced without...

Page 2: ...ampering with or operation of the equipment without following specific operating instructions will void this guarantee and release Novametrix from any further guarantee obligations Caution Federal U S...

Page 3: ...authorized representative for Novametrix Equipment is European Compliance Services Limited Oakdene House Oak Road Watchfield Swindon Wilts SN6 8TD UK Manufacturing Quality and Safety Novametrix manufa...

Page 4: ...Panel 6 Rear Top Panels 7 Summary of Operation 8 Menu Trees 9 Electronic Theory of Operation 15 2472 Power Supply Board 15 AC Mains and Battery Operation Overview 15 AC Mains Operation 16 Battery Ope...

Page 5: ...vice Controller 31 Watchdog Timer 31 Serial I O Controller 32 RS232 Serial Communication 33 Maintenance 35 General 35 Maintenance Schedules 35 Cleaning and Sterilization 36 Model 520A Monitor 36 Finge...

Page 6: ...rinter 67 Connecting Seiko DPU 411 Thermal Printer 68 Analog Output Module 69 Analog Output Setup 70 Specifications 73 General 73 Oxygen Saturation SpO2 Section 73 Pulse Rate Section 73 General Specif...

Page 7: ...n 01 Model 520A Service Manual vi PRELIMINARY 2755 01 TONE GEN REPL BOARD 87 2775 01 MAIN BOARD ASSY 87 2471 28 MAIN BD KIT part of 2775 01 89 2471 01 MAIN BOARD ASSY 91 Schematic and Assembly Drawing...

Page 8: ...le Voltage Selection Adjustment 41 Figure 8 Removing the Top Cover 42 Figure 9 Monitor Assembly 42 Figure 10 520A Assembly with 2471 Main Board Removed 43 Figure 11 Changing the System Software EPROM...

Page 9: ...LIMINARY T List of Tables Table 1 Display Command Data table 30 Table 2 CSI O Decode Lines 32 Table 3 SpO2 Display tolerances for TB500B settings 57 Table 4 Analog Output Module Voltage Tolerances 71...

Page 10: ...Section List of Tables ix Model 520A Service Manual 5693 90 01 PRELIMINARY...

Page 11: ...s for oxygen saturation SpO2 and pulse rate The monitor can be powered from its rechargeable internal battery or from the AC Mains The Model 520A utilizes sensors containing two light emitting diodes...

Page 12: ...t be used in conjunction with SuperBright Sensors These sensors have an 8700 series part number e g 8776 or 8791 An INCOMPATIBLE PROBE display message will indicate a non SuperBright Sensor e g 86xx s...

Page 13: ...been corrected by qualified personnel Keep OXYPLETH and its accessories clean Do not operate OXYPLETH when it is wet due to spills or condensation Do not operate OXYPLETH if it appears to have been d...

Page 14: ...ant levels of dysfunctional hemoglobin such as carboxyhemoglobin or methemoglobin Significant levels of indocyanine green methylene blue or other intravascular dyes Exposure to excessive illumination...

Page 15: ...e oximeter readings Do not stretch the finger sensor open beyond the limit for which it was designed Overstretching can be prevented avoid opening the sensor by any means other than squeezing the grip...

Page 16: ...u Press and release to disable Audio Off 9 Audio Off Indicator Flashes yellow as a warning that the audible alarms have been disabled 10 Alert Indicator Flashes red when an alert alarm occurs Continue...

Page 17: ...C Mains input voltage is identified here 5 AC Mains Power Switch With switch in O position AC Mains voltage does not enter monitor With switch in position AC Mains voltage allowed into monitor to powe...

Page 18: ...e Menu System menus include ALRT softkey Use SEL to select SpO2 or Pulse limits then use the or to set the limit to the desired value Note that the monitor will maintain a spread of at least 5 digits...

Page 19: ...5 Jun 01 Model 520A Service Manual 9 PRELIMINARY 8 Menu Trees The OXYPLETH menus are described on the following pages...

Page 20: ...2 HIST PREV TREND RETAINED ERASING TRENDS PLEASE WAIT SpO2 XX Hr RUN EXPAN D Moves Cursor Left Right Will select one of four settings 12Hr 8Hr 2Hr 30m Will increase decrease limits on selected paramet...

Page 21: ...k light On Off SELECT IABP MODE ON OFF IABPwill appear only if selected in SpO2 SETUP OPTIONS menu Varies volume where XX 00 through 07 Previous Menu Previous Menu Varies volume where XX 00 through 07...

Page 22: ...EL message center ALRT TRND CARD MENU SELECTS FROM LAST LAST 30 MINS LAST 1 HR LAST 2 HRS LAST 4 HRS LAST 8 HRS LAST 12 HRS LAST 24 HRS Previous Menu Previous Menu Previous Menu Previous Menu message...

Page 23: ...MENU key for 5 seconds Varies volume from 00 07 SELECT OPERATING MODE NICU ICU ANST SLEEP PREV Previous Menu Select the option to have the Pleth waveform automatically scaled to fit in the display wi...

Page 24: ...YES NO NOVACOM1 INTERFACE SET PREV NEXT NOVACARD INTERFACE SET PREV NEXT Previous Menu MONITOR OPTIONS 2 RUN SER CLOCK REC NEXT HH MM DD MMM YY SET SEL CALIBRATE RECORDER RUN ZERO HALF FULL PREV Sets...

Page 25: ...powered from the line voltage If AC Mains power is removed by unplugging the line cord or setting the rear panel power switch to the 0 Off position the monitor will operate for up to four hours from...

Page 26: ...ough current sense resistor R3 and fuse F302 to J302 pin 1 VBAT The battery float charge voltage is maintained at 13 2 volts except for fast charge which is regulated at 14 4 volts The output is also...

Page 27: ...y unplugging the line cord or setting the rear panel power switch to the 0 Off position the monitor will operate for up to four hours from its internal 12 volt lead acid battery As the battery voltage...

Page 28: ...is in turn shorts out R12 which affects the feedback control FB to IC1 pin 1 With R12 shorted out the control resistors R14 and R13 set the output voltage to 14 4 volts When the charge current lowers...

Page 29: ...at IC10 pin 2 is High the MOSFET Q7 is turned on and pulls the gate of MOSFET Q8 to ground thus causing Q8 to conduct as well With Q8 conducting the currently active monitor power source either the AC...

Page 30: ...CK is regulated by IC12 from the VIN supply Capacitors C22 and C27 serve as filters and D17 allows VCC to power VBACK circuitry when the monitor is on At this point D18 is biased off so IC12 is idle W...

Page 31: ...igh This means IC11 pin3 momentarily goes Low Q6 starts to conduct and IC10 pin 4 goes High In this reset condition the Q1 output 1 flip flop of IC10 pin 2 will be held high even if the user presses t...

Page 32: ...POWER key is pressed flip flop 1 is clocked IC11 pin11 goes High MOSFETs Q7 and Q8 turn on the supply to IC9 pin 7 is restored the pulse width modulator restarts energizes T1 and the monitor turns bac...

Page 33: ...the effects of any ambient light signals returning from the sensor See Sensor Photodiode Return Path on page 24 The IC42 INSIG and SIGND outputs are used in conjunction with the SC1 and SC2 inputs See...

Page 34: ...e photodiode Some of this light emerges from the tissue and impinges on the photodiode causing the photodiode to conduct current IC40 pins 1 3 is set up as a differential amplifier that converts this...

Page 35: ...the microprocessor sets the CAL line high The System Calibrations input SC1 is set high and SC2 is reset to a logic low The CS5503 ADC will not operate while the CAL line is high On the falling edge...

Page 36: ...pleting a word transmission thus freeing the data line for other uses i e the other ADC channel The Serial Clock speed is controlled through the digital board PEEL IC18 This clock rate is significantl...

Page 37: ...o voltage amplifier IC40 pin 1 This channel IC33 pin 15 is used in determining ambient light interference If this line is examined while the sensor s Red and Infrared LEDs are turned off then any DC l...

Page 38: ...A low pass filter consisting of RP10 pins 1 2 RP8 pins 1 8 and C92 provides a means to measure the cathode voltage of the sensor s Red LED If the channel at IC33 pin 4 is sampled the monitor can deter...

Page 39: ...battery is connected and maintains at least a nominal charge The RTC is activated when its Chip Select line CS0 at IC24 pin 2 is brought low With the monitor on PWRON will be low IC25 pin 13 the RTC...

Page 40: ...14 when the monitor is turned off but still connected to the AC line The 2MIN D3 AUDIO OFF D4 ALERT D5 and LOW BAT D1 LEDs are driven by the 8 bit latch IC13 When each of the corresponding signals is...

Page 41: ...1 2 3 respectively on IC22 With the LPORT line high IC13 is enabled this latches the data on lines D0 D7 1D 8D pins 2 9 on its output pins 19 12 1Q 8Q respectively the outputs correspond to the follo...

Page 42: ...its clocked serial data input RXS at IC16 pin 52 The PEEL IC18 acts as the Clocked Serial I O CSI O Controller Except during powerup or Watchdog Timer reset IC39 pin 3 provides an interrupt to the CSI...

Page 43: ...ransmitter Receiver IC1 uses a single 5 volt supply pin 16 The two Receive Rx inputs can accept 30 volt levels while the two Transmit Tx lines output 9 volt levels The four level translators within th...

Page 44: ...nalog Module Catalog Number 9622 01 which when connected to the rear panel connector provides analog representations of the SpO2 and Pulse Rate values a plethysmogram signal and a pass through port fo...

Page 45: ...used as a spot check to verify system operation if reports of malfunctions are received The test verifies overall functional integrity of the monitor and sensors Section 12 Functional Test on page 51...

Page 46: ...ith no broken or frayed wires or damaged parts Make certain that the connectors are clean and dry with no signs of contamination or corrosion Do not use a broken or damaged sensor or one with wet cont...

Page 47: ...on the front panel is illuminated and allow the monitor to charge for 24 hours before switching it on Mains Voltage Configuration 10 5 The rear panel power entry module indicates the mains voltage se...

Page 48: ...verify that the proper mains operating voltage is displayed Changing the Mains Voltage Setting 10 5 2 1 Check that the monitor is OFF 2 Set the rear panel power entry module switch to OFF O Remove the...

Page 49: ...3 The Model 520A will operate on line voltages of 100 120 220 or 240 VAC 10 at 50 60 Hz At 100 120 VAC two 0 5 Amp 250 Volt Slo Blo time delay AC Mains fuses are required while Two T 250 mA 250 Volt...

Page 50: ...rrow indicator the fuse holder assembly will slide out 4 After replacing the fuse s snap the fuseholder assemblies into the PEM and shut the Fuse Access Door Changing the AC Mains Voltage 10 5 5 1 Tur...

Page 51: ...ions are pictured below 5 Snap the Voltage Selector Drum back into the PEM Be sure that the Voltage Setting Indicator shows the proper voltage Close the Fuse Access Door Assembly Exchanges 10 6 Disass...

Page 52: ...ft first one side and then the other side a little at a time Set the Red Alert Bar lens aside with the cover for safe keeping 3 Unplug P102 The Power Supply connector from the 2471 Main Board disconne...

Page 53: ...s are improperly connected 7 After the monitor is fully assembled perform safety checks Reconnect the line cord to the AC Mains and to the monitor Set the AC Mains switch to the On position Verify the...

Page 54: ...e changing the system software 2 Use a PLCC extraction tool to carefully pry the EPROM IC17 from the socket 3 Install the update EPROM into the socket Align the EPROM so that IC17 pin 1 is inserted in...

Page 55: ...to pry the EPROM IC17 from the socket be careful not to bend the pins 3 Install the new EPROM into the socket Align the EPROM so that IC17 pin 1 is inserted into pin 1 of the socket 4 Reverse the abov...

Page 56: ...Section 10 Maintenance 46 Model 520A Service Manual 5693 90 01 PRELIMINARY This page intentionally blank...

Page 57: ...to Monitor s rear panel fuse has blown monitor switched over to battery power and has depleted battery life CAN T I D PROBE Sensor is placed on too thick of a site Reposition the sensor on a thinner...

Page 58: ...monitor operation Reposition sensor MONITOR ERROR Monitor faulty Record error message appearing on bottom line of display and contact qualified service personnel RAM SELF TEST FAILED Ram failed the po...

Page 59: ...ed from patient improperly applied or placed on an area too translucent for proper sensor operation Reposition sensor PULSE HIGH Selected pulse rate high alert limit has been violated PULSE LOW Select...

Page 60: ...Section 11 Troubleshooting 50 Model 520A Service Manual 5693 90 01 PRELIMINARY This page intentionally blank...

Page 61: ...t the monitor and line cord Verify there is no external damage Shake the unit to check that there is no loose hardware inside 12 2 3 Inspect the sensor s Verify mechanical integrity 12 2 4 Check the r...

Page 62: ...UN 12 2 14 Press the Menu key and then the AUDIO key Press the PULSE key to display the SET AUDIO FEATURES menu Press the key to set the value to 01 then press RUN 12 2 15 Do not apply the sensor to y...

Page 63: ...up with the factory default settings in place After the self test is complete turn the monitor off 12 2 26 This completes the Functional Test If the monitor and sensor performed as described above the...

Page 64: ...containing the system software Press and hold Softkey 3 while the checksum is displayed and the monitor enters Production Test Mode Softkey 2 Extended Display and Watchdog Test Turn the monitor on whi...

Page 65: ...Equipment Required Model 520A to be tested AC Mains Line Cord supplied with monitor TB500B Sensor Simulator Cat No 5530 00 13 2 2 Press and release the front panel POWER key The monitor will Briefly...

Page 66: ...hold both the TB500B RED and INFRARED push buttons Verify the displays blank out and CONNECT SPO2 PROBE is displayed Release the buttons Verify the displays and Pulse Activity Bar return 13 2 11 Disc...

Page 67: ...Main Menu 13 2 15 This completes the Monitor Accuracy Test If the monitor does not meet the above listed specifications refer to Section 14 Calibration Tests on page 59 or contact the Novametrix Serv...

Page 68: ...Section 13 Accuracy Test 58 Model 520A Service Manual 5693 90 01 PRELIMINARY This page intentionally blank...

Page 69: ...g The TB500B is an updated version of the TB500A2 Test Box If the monitor does not pass the Calibration Tests remove it from use and contact the Novametrix Service Department for repair replacement as...

Page 70: ...when the Mains switch is set to if this occurs turn the monitor off with the front panel button 14 3 2 Measure the voltage at J102 pin 2 and verify 13 2 VDC 0 4 volts This voltage is dependent on a f...

Page 71: ...o MONITOR TEST 2 Of the list below only the tests with next to them are performed in the auto test Upon completion of the auto test the monitor will default to MONITOR TEST 2 The following is a list o...

Page 72: ...e main monitoring screen 14 3 14 Press the Menu softkey followed by the Avg and 2s softkey then press Run 14 3 15 Set the TB500B to the settings in the chart Verify the saturation values are within th...

Page 73: ...3 27 Set the current time date Press and hold the Menu softkey Press the Next softkey until Monitor Options 2 appears Press the Clock softkey Use the appropriate softkeys to set the correct Time Mins...

Page 74: ...Section 14 Calibration Tests 64 Model 520A Service Manual 5693 90 01 PRELIMINARY This page intentionally blank...

Page 75: ...85 00 interface cable to the monitor s RS232 connector and to the printer s serial input connector the 9 pin D connector 2 Connect the AC adapter and turn the printer on Configuring the Seiko DPU 414...

Page 76: ...E mode CAUTION DIP SW Set Mode cannot be cancelled once it is initiated Answer ON or OFF for every setting CAUTION Never turn the printer off while it is writing the new settings to memory Wait until...

Page 77: ...kJet If Model 520A has an Analog Module attached connect to the module s RS232C connector 4 Connect the printer s AC input and turn the printer on 5 Select T Jet ThinkJet from the Ser Serial portion o...

Page 78: ...r to the Model 315 documentation for further printer details Connecting Seiko DPU 411 Thermal Printer 15 4 To connect the SIEKO Model DPU 411 Thermal Printer to the Model 520A 1 Set the DIP switches l...

Page 79: ...15 5 The optional Analog Output Module Catalog Number 9622 01 provides the necessary analog output voltages for use with analog instruments such as strip chart recorders The Model 520A does not direct...

Page 80: ...With the monitor in normal running mode press and hold the MENU key until SPO2 SETUP OPTIONS appears on the display Press the NEXT key until Figure 17 Analog Output Module Figure 18 Analog Output Modu...

Page 81: ...RO key and adjust the analog baselines on the recorder Press the FULL key and adjust the recorder full scale deflection Press the HALF key and check that the recorder registers at half scale Note Earl...

Page 82: ...l return to Monitoring Mode and automatically begin outputting analog data to the Analog Output Module Note This setup procedure does not have to be performed each time the monitor is turned on the mo...

Page 83: ...pitched beeps Settling Time Display settles to within 1 of the final reading less than 15 seconds after the sensor is properly applied Alerts Continuously displayed Menu selectable high and low limits...

Page 84: ...cessive alerting reduces battery life When 15 minutes of battery life remain the low battery indicator illuminates When the battery becomes exhausted the monitor display shuts down Connect to AC power...

Page 85: ...ible with Seiko DPU 414 Thermal Printer Seiko DPU 411 Thermal Printer Hewlett Packard ThinkJet Printer Novametrix Model 315 Printer Novametrix Model 1260 Capnograph Novametrix Model 1010 Telemetry Cen...

Page 86: ...ect a Finger Sensor or Y Sensor Management Plan for each SuperBright Pulse Oximeter The plan you select determines the length of coverage 36 or 60 months How the Plans Work Included in each Plan are T...

Page 87: ...ue 8832 00 25mm Finger Style Taping System 100 per box Use on adult finger color coded green 6929 00 Adhesive Foam Wraps Large 25 per box 6968 00 Adhesive Foam Wraps Small 25 per box 8836 00 Non Adhes...

Page 88: ...Saturation Sensor Extension Cable 4 feet 4942 00 Saturation Sensor Extension Cable 6 feet 4943 00 Saturation Sensor Extension Cable 10 feet 5266 00 Saturation Sensor Extension Cable 25 feet 6147 00 S...

Page 89: ...140101 Mounting Plate Kit ROLLSTAND AND MOUNTING ACCESSORIES 140095 Adapter Plate Kit for 515B C 520A 2001 1265 7100 860 and CO2SMO Plus 140099 Laptop Tray with Adapter Plate 140030 Wall Mount 140031...

Page 90: ...Section 17 Accessories 80 Model 520A Service Manual 5693 90 01 PRELIMINARY This page intentionally blank...

Page 91: ...mbly 5693 01 MAIN ASSEMBLY 18 2 Seq Item Nbr Description Qty 013 140002 CARD GUIDE 2 5 L 2 005 5713 01 SPEAKER ASSY 1 007 5719 01 FRONT PANEL ASSY 1 014 161067 TAPE CL CELL 0 2471 2775 MAIN BD ASSY 56...

Page 92: ...001 LOCK WASHER NO 6 0 019 285005 FLAT WASHER NO 8 0 003 5812 10 SPACER SUPPORT 2 002 4109 10 SUPPORT BRACKET PC 1 024 161092 ADHESIVE 262 0 006 9090 01 POWER CABLE ASSY 1 001 2726 01 POWER SUPPLY BD...

Page 93: ...000 474145 RESISTOR 215 OHM 000 481530 DIODE KBU4G 4 AMP 000 474214 RESISTOR 332K OHM 1 000 474137 RESISTOR 1M OHM 1 000 481549 DIODE MBRS14OT3 1 000 152096 CAPACITOR 220UF 1 000 484529 VOLTAGE REGULA...

Page 94: ...Y BD 1 032 481530 DIODE KBU4G 4 AMP 1 040 515046 FUSE 2A 250V 1 020 472022 RESISTOR 4 99K OHM 1 044 161049 ADHESIVE HOT MELT 0 028 472185 RESISTOR 61 9K OHM 1 035 484529 VOLTAGE REGULATOR 1 014 180014...

Page 95: ...0 285000 LOCK WASHER NO 4 0 002 5676 27 MEMBRANE KEYPANEL 1 008 284200 4 40 X 1 4 SLOTTED 0 007 280187 STANDOFF 187 DIA 0 004 6278 10 SHIELD VFD 1 009 284204 4 40 X 1 2 SLOTTED 0 Seq Item Nbr Descript...

Page 96: ...2EAWG PVC INS 0 003 180009 FERRITE SLEEVE 1 013 605065 WIRE 26AWG PVC INS 0 012 605064 WIRE 26AWG PVC INS 0 002 161060 EPOXY 2 PART 5 7 0 005 211630 CONNECTOR 6 PIN 1 009 605060 WIRE 26AWG PVC INS 0 0...

Page 97: ...011 211814 CONNECTOR 8 PIN 2 010 154104 CAPACITOR O1UF 4 002 2755 03 SCHEM TONE GEN REPL 0 003 9074 07 IC TONE GENERATOR 1 016 474235 RESISTOR 24 9K OHM 2 019 474270 RESISTOR 200K OHM 1 011 211815 CO...

Page 98: ...1 000 474132 RESISTOR PACK 41K 2 000 472276 RESISTOR 6 49K OHM 2 000 470016 RESISTOR 22 OHM 1 000 472268 RESISTOR 8 66K OHM 1 000 5833 01 GROUND WIRE ASSY 1 000 472003 RESISTOR 100 OHM 2 000 472146 RE...

Page 99: ...eq Item Nbr Description Qty 001 180012 FERRITE BEAD 1 000 484535 VOLTAGE REGULATOR L 1 000 486295 IC MM74HC4OS1N 1 000 484534 VOLTAGE REGULATOR 1 000 486625 MC74HC32N I C QUAD 3 000 211414 CONNECTOR 4...

Page 100: ...86685 IC DUAL 8 BIT 1 000 486256 IC K6TO8O8C1D DB7O 1 000 485529 TRANSISTOR VNO61OL 7 000 154057 CAPACITOR 470pF 1 000 485527 MOSFET 1RF9523 1 000 211412 CONNECTOR 4 PIN 1 000 484014 NPN TRANSISTOR ZT...

Page 101: ...IN BD 0 058 472021 RESISTOR 4 75K OHM 1 004 5715 07 PROGRAM SPO2 520A 1 001 2471 02 FAB MAIN BOARD 1 020 153003 CAPACITOR O1UF 1 070 472193 RESISTOR 23 7K OHM 1 094 481541 DIODE bOy 1A 4 090 475034 PO...

Page 102: ...0 OHM 1 145 474086 RESISTOR PACK 10K 1 003 5711 10 TRANSFORMER MAIN BD 0 060 472034 RESISTOR 12 1K OHM 1 025 153038 CAPACITOR OO1UF 1 016 152075 CAPACITOR 47UF 25V 2 028 154016 CAPACITOR 1UF 59 142 21...

Page 103: ...nit Assy 2471 01 Main Board Assy 2471 03 Main Board Schematic 2775 01 Main Board Assy 2775 03 Main Board Schematic 2755 01 Tone Generator Replacement Bd 2755 03 Tone Generator Replacement Bd 5728 01 C...

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