Smiths Medical BCI 3304 Service Manual Download Page 4 | Manualshive

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Table of Contents

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3304 Service Manual

Input buffer ..................................................................................................2-4
Synchronous Serial Port ..........................................................................2-4
Asynchronous Serial Port ........................................................................2-4
RS-232 Isolation Interface .......................................................................2-4

A/D Converter ......................................................................................................2-5
LED Drive ...............................................................................................................2-5
Signal Processing ................................................................................................2-6
Display Board .......................................................................................................2-6
Signal Dictionary ................................................................................................2-7

Oximeter Board ..........................................................................................2-7

Display Board ....................................................................................................2-10
Test Equipment and Tools Required .........................................................2-10
Voltage Test Points ..........................................................................................2-11
Waveform Test Points .....................................................................................2-11

Appendix .................................................................. App-1

Parts Lists .........................................................................................................App-1

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Summary of Contents for BCI 3304

Page 1: ...og Number 1858 Version 7 April 2008 2008 Smiths Medical family of companies All rights reserved 98 80 B M SENSOR bpm SpO2 J o n H L 98 80 B bpm SpO2 o n L PULSE VOLUME ALARM VOLUME SILENCE LO BATT ALARM ARTIFACT SEARCH SENSOR ALARM SELECT ID CLEAR ...

Page 2: ......

Page 3: ...ce ix Chapter 1 Introduction 1 1 About this Manual 1 1 Symbol Definitions 1 1 Warnings 1 3 Cautions 1 8 Notes 1 8 Chapter 2 Oximeter Circuit Description 2 1 Functional Structure 2 1 Battery Charger 2 1 General Description 2 1 Oximeter On Off Control 2 2 System Power Supply 2 2 Microprocessor Circuit 2 2 Reset Circuit 2 3 Memory and I O Decoding 2 3 Dual microprocessor operation 2 3 Interface Circu...

Page 4: ...Serial Port 2 4 RS 232 Isolation Interface 2 4 A D Converter 2 5 LED Drive 2 5 Signal Processing 2 6 Display Board 2 6 Signal Dictionary 2 7 Oximeter Board 2 7 Display Board 2 10 Test Equipment and Tools Required 2 10 Voltage Test Points 2 11 Waveform Test Points 2 11 Appendix App 1 Parts Lists App 1 ...

Page 5: ...1 and 5 558 096 BCI and the Smiths design mark are trademarks of the Smiths Medical family of companies The symbol indicates the trademark is registered in the U S Patent and Trademark Office and certain other countries All other names and marks mentioned are the trade names trademarks or service marks of their respective owners ...

Page 6: ...Table of Contents iv 3304 Service Manual This page is intentionally left blank ...

Page 7: ...art Updated warnings cautions and notes Changed some cautions and notes to warnings Updated Appendix for Assembly drawings and Schematics revision date Rev 6 June 2006 changes Updated line art Updated copyright statement on front cover Added trademark and patent information to table of contents Updated company name Updated warranty section Moved information from Chapter 3 to Chapter 1 Added symbol...

Page 8: ...Revision History vi 3304 Service Manual This page is intentionally left blank ...

Page 9: ... as of the date of publication or revision but does not constitute a warranty Warranty Limited Warranty Smiths Medical PM Inc Seller warrants to the original purchaser that the Product not including accessories shall be free from defects in material and workmanship under normal use if used in accordance with its labeling for two years from the date of shipment to the original purchaser Seller warr...

Page 10: ...ructions for use and others Conditions of Warranty This warranty is void if the Product has been altered misused damaged by neglect or accident not properly maintained or recharged or repaired by persons not authorized by Seller Misuse includes but is not limited to use not in compliance with the labeling or use with accessories not manufactured by Seller This warranty does not cover normal wear a...

Page 11: ...ing material including foam inserts If you need to ship the device use only the original packaging material including inserts Box and inserts should be in original condition If original shipping material in good condition is not available it should be purchased from Smiths Medical PM Inc Damages occurred in transit in other than original shipping containers are the responsibility of the shipper Al...

Page 12: ...Warranty Service Information x 3304 Service Manual This page is intentionally left blank ...

Page 13: ...ns Oximeter Circuit Description Contains circuit descriptions voltage test points and waveform test points for the oximeter and display board Parts Lists Circuit Diagrams Contains detailed parts lists and circuit diagrams for the oximeter Symbol Definitions SYMBOL DEFINITION 6 Caution Federal U S A law restricts this device to sale by or on the order of a physician p Type CF equipment S Type B Equ...

Page 14: ...EE Directive 2006 96 EC and implementing regulations all devices and service items within the scope of the Directive purchased new after August 13 2005 must be sent for recycling when ultimately becoming waste Devices and items must not be disposed of with general waste If purchased before that date they may also be sent for recycling if being replaced on a one for one like for like basis this var...

Page 15: ...he above advice KEYWORD DEFINITION WARNING Tells you about something that could hurt the patient CAUTION Tells you about something that could damage the monitor NOTE Tells you other important information Warnings WARNING Do not use this device in the presence of flammable anesthetics WARNING Do not use this device in the presence of magnetic resonance imaging MR or MRI equipment Warning Operation ...

Page 16: ...ng the sensor site periodically Change sensor site and check skin integrity circulatory status and correct alignment at least every 4 hours WARNING When attaching sensors with Microfoam tape do not stretch the tape or attach the tape too tightly Tape applied too tightly may cause inaccurate readings and blisters on the patient s skin lack of skin respiration not heat causes the blisters WARNING Co...

Page 17: ...roximity It can be eliminated by covering each site with an opaque material Warning Remove fingernail polish or false fingernails before applying SpO2 sensors Fingernail polish or false fingernails may cause inaccurate SpO2 readings Warning Significant levels of dysfunctional hemoglobins such as carboxyhemoglobin with CO poisoning or methemoglobin with sulfonamide therapy will affect the accuracy ...

Page 18: ...the signal output port configures a medical system and therefore is responsible that the system complies with the requirements of the system standard IEC 601 1 WARNING IEC 60950 approved equipment must be placed outside the patient environment The patient environment is defined as an area 1 5 m 4 92 feet from the patient Figure 1 1 Patient Environment WARNING Disconnect the AC power supply from th...

Page 19: ...becoming entangled in the cable If necessary use tape to secure the cable WARNING If there is a risk of the AC power supply becoming disconnected from the monitor during use secure the cord to the monitor several inches from the connection WARNING Under certain clinical conditions pulse oximeters may display dashes if unable to display SpO2 and or pulse rate values Under these conditions pulse oxi...

Page 20: ...clave ethylene oxide sterilize or immerse the monitor in liquid Evidence that liquid has been allowed to enter the monitor voids the warranty Caution Chemicals used in some cleaning agents may cause brittleness of plastic parts Follow cleaning instructions in this manual CAUTION Pressing front panel keys with sharp or pointed instruments may permanently damage the keypad Press front panel keys onl...

Page 21: ...n cable The key labels contains the front panel touch keys The probe connector assembly is a cable connecting main board with patient probe Battery Charger General Description The wall mount charger has an unregulated 12 V DC output that comes into the main board at J10 Transorb D13 prevents electrostatic discharges from entering the system The charger circuit built around linear regulator U27 gen...

Page 22: ...ed either through diode D4 when the Charger is plugged in or through D6 when running on the battery A low power linear 5 V regulator U26 is used to supply continuous power to RAM when the unit is turned off This V RAM supply also provides power to the ON OFF circuitry The main power supply is built around U25 a pulse width modulated switch mode fly back converter The transformer T1 is used to gene...

Page 23: ...H Interrupt request to microprocessor U11 Demultiplexer U16B decodes A14 A15 and IOE to allocate I O space The following chart shows the I O address allocation FROM TO SIGNAL OR ENABLED DEVICE 0000H 3FFFH not used 4000H 7FFFH U20 U21 and U22 strobe signal 8000H BFFFH HOLD signal to A D converted U8 C000H FFFFH U29 strobe signal Dual microprocessor operation Microprocessor U11 is a slave Digital Si...

Page 24: ... converter U8 U6 s data is latched with the I O strobe POT LD display driver chips U1 s and U2 s data is latched with the I O strobe DISP LD Asynchronous Serial Port The microprocessor has two internal asynchronous serial ports TXA0 RXA0 and TXA1 RXA1 TXA1 RXA1 is used for manufacturer test applications TXA0 RXA0 is used for sending printer data to the printer through isolation barrier RS 232 Isol...

Page 25: ... is read serially clocked by the CKS signal LED Drive The red LED drive circuit consists of a programmable current sink formed by U3A U6 and Q3 and MOSFET bridge Q1 and Q2 LED current is defined by the voltage generated by the second channel of digital potentiometer U6 referred to the output of the 2 5VDC voltage reference U7 This voltage is compared with the voltage across current sense resistors...

Page 26: ...or measurement Display Board The display board contains the LED display driver chips the 7 segment displays the LED bar graph and the indicator lights The display board connects to the main board through a fourteen conductor ribbon cable The display driver chips U1 and U2 are connected in a data chain and receive synchronous data from the microprocessor s TXS and CKS lines The data is loaded with ...

Page 27: ...by microprocessor to turn power off INT1 INT1 is used to inform microprocessor that power control flip flop U19A A19B was switched to the power off condition and power will disappear soon IO1 Strobe to U20 to read input data and to U21 and U22 to latch output data IO2 HOLD ADC strobe signal starts data conversion IO3 Strobe to U29 to latch output data RD WR ME IOE Signals used by master microproce...

Page 28: ...GRAT RST INT Signals used to control integrator U4A IR DRV RED DRV IR ENBL RED ENBL Signals used to control MOSFET bridge Q1 and Q2 which powers probe LED s KEY INx KEY OUTx Keypad input output scan control signals LED DRV Signal which defines LED drive current ME ME is the microprocessor s memory enable output ME is routed to decoder U16A to enable memory decoding ON STBY Line connected to the O ...

Page 29: ...hronous serial output transmitted data signal V AMB V AMB is the output of the front end differential amplifier V BATT Signal used to monitor battery voltage V POWER Input external voltage Also used to light green CHARGE LED on the display board V RAM 5 VDC voltage generated by U26 to power RAM and on off circuitry V REF 2 500 VDC reference voltage VCC VCC is the regulated 5 VDC supply generated b...

Page 30: ...ly regulator DSP powers the display drivers U1 and U2 Sa Sg Sa Sg originate at display driver U1 and are routed to the seven segment displays and the led bar graph The state of Sa through Sg determine which display or bar graph segments light when the corresponding DIG signal is strobed TXS Same as oximeter board TXS Test Equipment and Tools Required To diagnose and repair the full extent of possi...

Page 31: ...TP3 FLTR 5 Same as TP3 Same as TP3 V REF Oximeter on 2 500 VDC V RAM Oximeter on or off 5VDC 0 25 VDC U10 71 Oximeter on 6 144 MHz 50 duty cycle TP7 Referred to TP6 4 7 VDC to 5 3 VDC TP5 Oximeter on or off 5 2 VDC to 7 2 VDC depending on the state of the charge of the battery TP14 Oximeter is on 3 65 VDC 0 1 VDC Waveform Test Points The waveforms are measured with respect to ground at TP1 The osc...

Page 32: ...Chapter 2 Oximeter Circuit Description 2 12 3304 Service Manual A 0V A 0 2 V TB 0 4 ms A 0 V A 1 V TB 0 4 ms A 0V A 1 V TB 0 4 ms A 0 V A 1 V TB 0 4 ms A 0V A 1 V TB 0 4 ms TP16 TP15 TP10 TP11 TP12 ...

Page 33: ...er BOM A 1 2 71200A1 F ASM Drawing A 2 4 71200S1 F ASM Schematic A 3 1 71204B1 PWB ASM Main Bd A 4 2 71204B1 PWB ASM Main Bd Parts List A 5 4 71204S1 PWB ASM Main Bd Schematic A 6 8 71206B1 PWB ASM Display A 7 1 71206B1 PWB ASM Display Parts List A 8 1 71206S1 PWB ASM Display Schematic A 9 1 Appendix ...

Page 34: ...Appendix App 2 3304 Service Manual This page is intentionally left blank ...

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Page 36: ... Ltd Colonial Way Watford Herts WD24 4LG UK Phone 44 1923 246434 Fax 44 1923 240273 Australian Representative Smiths Medical Australasia Pty Ltd 61 Brandl Street Eight Mile Plains QLD 4113 Australia Tel 61 0 7 3340 1300 H Manufactured By Smiths Medical PM Inc N7W22025 Johnson Drive Waukesha WI 53186 1856 USA ...

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