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Philips M3921A Service Manual

Patient monitors
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Philips A1 and A3 Patient Monitors
A1 Models:
A3 Models:
Service Guide
*M3921-9000C*
M3921A
M3922A
M3923A
M3924A
M3926A
M3927A
M3928A
M3929A
Part Number M3921-9000C
Printed in the U.S.A. February 2002
First Edition

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Summary of Contents for Philips M3921A

  • Page 1 Philips A1 and A3 Patient Monitors A1 Models: M3921A M3922A M3923A M3924A A3 Models: M3926A M3927A M3928A M3929A Service Guide Part Number M3921-9000C Printed in the U.S.A. February 2002 First Edition *M3921-9000C*...

  • Page 2: About This Manual

    The information contained in this document is subject to change without notice. Philips Medical Systems makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties or merchantability and fitness for Philips Medical Systems shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.
  • Page 3 The following License Terms govern your use of the accompanying Software unless you have a separate signed agreement with Philips Medical Systems. License Grant. Philips Medical Systems grants you a license to Use one copy of the Software. "Use" means storing, loading, installing, executing or displaying the Software. You may not modify the Software or disable any licensing or control features of the Software.
  • Page 4 (Jun. 1987)(or any equivalent agency regulation or contract clause), whichever is applicable. You have only those rights provided for such Software and any accompanying documentation by the applicable FAR or DFARS clause or the Philips standard software agreement for the product involved.

  • Page 5: Text Conventions

    About this Manual Text Conventions The following conventions for Notes, Cautions, and Warnings are used in this manual. NOTE A Note calls attention to an important point in the text. Caution A Caution calls attention to a condition or possible situation that could damage or destroy the product or the user’s work.
  • Page 6 About this Manual NiBP Temperature Located on recorder. Produces a 20 Second Snapshot Located on recorder. Produces a Continuous Print Signal (ECG) Input Signal (ECG) Output Data input/output Alternating Current Direct Current Temperature Humidity Altitude or atmospheric pressure...
  • Page 7 About this Manual Contains parts that may not be put into normal waste disposal but must be recycled or dealt wi disposed as chemical waste Fragile, handle with care Keep dry Consult instructions for use Date of manufacture Refer to User’s Guide DC Lines DC Input Defib Sync.
  • Page 8 About this Manual Recorder’s front-panel charging LED Recorder’s front-panel communication LED Ground Wire viii...

  • Page 9: Table Of Contents

    Contents 1. Introduction ............1 Manual Overview .
  • Page 10 5. Troubleshooting........... . 49 Introduction .
  • Page 11 9. RS-232 Interface ..........115 Cable Connections .
  • Page 12 Contents...

  • Page 13: Introduction

    Introduction Manual Overview This manual contains information for servicing the A1 and A3 patient monitors, subsequently referred to as the monitor throughout this manual. Only where there are differences in service procedures for the two monitor types is each monitor referred to specifically as A1 and A3. Only qualified service personnel should service this product.

  • Page 14: Patient Monitor Description

    The measurement parameters and features for each model are indicated below. Model Measurement Parameters and Features NIBP Temp Resp Integral Color/ Recorder Mono A1 Monitor M3921A Mono M3922A Mono M3923A Mono M3924A Mono M3925A Optional Standalone Recorder for A1 A3 Monitor M3926A...

  • Page 15: Introduction To External Recorder (M3925A)

    Introduction to External Recorder (M3925A) Introduction to External Recorder (M3925A) The recorder is an optional, standalone printer designed for use with the A1 patient monitor. The recorder communicates with the monitor using a null- modem cable connected between each device’s RS-232 connector. The recorder contains an internal battery, which, when fully charged, will operate the recorder for 3 hours (typical, at 25°C, producing fifteen 20-second printouts per hour).
  • Page 16 Related Documents Introduction...

  • Page 17: Routine Maintenance

    (if required by your local institution). 1. Inspect the exterior of the monitor for damage. 2. Inspect labels for legibility. If the labels are not legible, contact Philips’ Response Center or your local Philips representative. 3. Verify that the NiBP performs properly as described in “Verification of Pneumatic System”...

  • Page 18: Environmental Protection

    Environmental Protection The battery can be recharged while the monitor is in use, in which case, the battery requires 14 hours to be recharged. The battery can require a full discharge/charge cycle to restore normal capacity. If the monitor operates for less than one hour on battery power before the low battery alarm occurs, the battery should be conditioned.

  • Page 19: Performance Verification

    Performance Verification Introduction This section discusses the tests used to verify performance following repairs or during routine maintenance. All tests can be performed without removing the covers of the monitor. If the monitor fails to perform as specified in any test, repairs must correct the problem before the monitor is returned to the user.

  • Page 20: Test And Inspection Matrix

    Test And Inspection Matrix Test And Inspection Matrix The following test map shows which tests are required in which situations. Table 1 Test Map Service Event (When Test Blocks Required (…Complete Performing…) these Tests) Installation Visual and Power On Tests Repairs A.
  • Page 21 1. Details of the tests are included later in this chapter. 2. When authorized Philips Medical Systems personnel service the instru- ment. The results are reported back to Philips. The collected data form a database to be used in product development. It is not necessary for hospi- tal personnel to report these results.

  • Page 22: Equipment Needed

    Equipment Needed Equipment Needed The following table lists the equipment required for performance verification. Table 3 Required Test Equipment Required For Equipment Description · · Digital multimeter Fluke Model 87 or equivalent (DMM) · · Sensor extension cable M4787A · ·...

  • Page 23: Performance Tests

    Performance Tests Performance Tests The battery charge and battery performance test should be performed before monitor repairs whenever the battery is suspected as being a source of the problems. All other tests can be used following repairs or during routine maintenance (if required by your local institution).

  • Page 24: Battery Performance Test

    Battery Performance Test Battery Performance Test The the A1 and A3 mono monitors are specified to typically operate on battery power for a minimum of 4 hours, at 25°C, with no printing, and one NiBP measurement every 15 minutes. The A3 color monitor is specified to typically operate on battery power for a minimum of 3 hours, at 25°C, with no printing, and one NiBP measurement every 15 minutes.

  • Page 25: Power-On Self-Test

    Power-On Self-Test The A1 and A3 mono monitors must operate for at least 4 hours before they automatically power down due to low battery condition. The A3 color monitor must operate for at least 3 hours before the monitor automatically powers down due to low battery condition.

  • Page 26: Hardware And Software Tests

    Hardware and Software Tests Hardware and Software Tests Hardware and software testing includes the following tests applicable to the indicated models in the series: Test Applies to Model(s) Testing A1, A3 - all models Operation with an ECG Simulator A1 - M3923A, M3924A A3 - all models Operation with a Respiration Simulator A3 - all models...
  • Page 27 Hardware and Software Tests indicates zero or is blank. The pulse bar can occasionally indicate a step change as the monitor is in the pulse search mode. Move the modulation switch on the SRC-2 to LOW. Verify the following monitor reaction: The pulse bar begins to track the artificial pulse signal from the SRC-2.
  • Page 28 Hardware and Software Tests Power on the monitor and verify that the SpO and heart rate values are correctly displayed. Press the ALARM SILENCE button on the front panel of the monitor to temporarily silence the audible alarm. Verify that the heart rate tone source, found in the Heart Rate Menu, is set to Press the Heart Rate Tone VOLUME button on the front panel of the monitor.

  • Page 29: Operation With An Ecg Simulator

    Hardware and Software Tests Nellcor Puritan Bennett Oxisensor II adhesive sensor, 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. Connect a M4787A sensor extension cable to the monitor. Connect a D-25 sensor to the sensor extension cable.

  • Page 30: Operation With A Respiration Simulator (A3 Only)

    Hardware and Software Tests After normal power-up sequence, verify the following monitor reactions: After at least five heartbeats, the monitor displays a heart rate of 30 ±5 bpm. HEART RATE The audible alarm sounds and the display flashes, indicating heart rate is below the default lower alarm limit. Press the ALARM SILENCE button.

  • Page 31: Verification Of Pneumatic System

    Hardware and Software Tests After the normal power-up sequence, verify the following monitor reactions: The monitor displays a respiration rate of 120 ±3 breaths per minute. RESPIRATION RATE The audible alarm sounds and display flashes, indicating respiration rate is above default upper alarm limit. Press the ALARM SILENCE button .
  • Page 32 Hardware and Software Tests Power on the monitor and enter the NiBP test screen. Use the wheel to select Set up menu (screwdriver icon on bottom of screen.) Select the Power up defaults menu. Use the wheel to select password 2-1-5. Enter Diagnostic Mode = yes Select Select NBP test.
  • Page 33 Hardware and Software Tests Confirm that the Bio-Tek simulator is in test mode. The simulator should display Pressure Gauge Confirm that the simulator is set up for the internal cuff. Confirm that the NiBP Test screen is active on the monitor. •...
  • Page 34 Hardware and Software Tests The pneumatic leakage test verifies the integrity of the pneumatic system. Pneumatic Leakage Ensure that the Bio-Tek simulator is in test mode. The simulator should display Pressure Gauge Confirm that the simulator is set up for the internal cuff. Ensure that the NiBP Test screen is active on the monitor.
  • Page 35 Hardware and Software Tests The inflation rate test verifies the inflation rate of the monitor. Inflation Rate Ensure that the Bio-Tek simulator is in test mode. The simulator should display Pressure Gauge Confirm that the simulator is set up for the internal cuff. Ensure that the NiBP Test screen is active on the monitor.
  • Page 36 Hardware and Software Tests pressure of 0 mmHg by doing the following: Press the CONTRAST button on the monitor. Press the ZERO button on the simulator. Press the NiBP button on the monitor to activate the pump. Hold the NiBP button until the monitor displays a pressure of approximately 250 mmHg.

  • Page 37: Operation With A Temperature Simulator (A1 Only)

    Hardware and Software Tests Hold the NiBP button until the monitor displays a pressure of approximately 250 mmHg. Start 1 minute timer, and simultaneously press and hold the ALARM SILENCE button on the monitor. This causes the pneumatic system to deflate at a rate of 3 mmHg/s ±1.5 mmHg/ After 1 minute, record the pressure displayed on the monitor.

  • Page 38: General Operation

    General Operation Press the ON/STANDBY button to turn monitor on. After normal power-up sequence, verify temperature reads 37°C ±0.1°C (98.6°F ±0.2°F if Fahrenheit is selected as temperature units.) Turn the monitor off. General Operation The following tests provide an overall performance check of the system: •...
  • Page 39 General Operation Table 5 Serial Interface Voltages Measurement (V) Signal Direction Min. Typical Max. not used RXD<<< input –0.4 TXD>>> output –0.5 –9.0 –15.0 DTR>>> output –5.0 –9.0 –15.0 –0.4 DSR<<< input –0.4 RTS>>> output –5.0 –9.0 –15.0 CTS<<< input –0.4 Alarm Out>>>...

  • Page 40: Printer Verification (For A1 Optional Printer M3925A)

    General Operation Printer Verification (For A1 Optional Printer M3925A) Printer verification consists of connecting the printer to the monitor and the monitor to a human subject for a qualitative test. Connect the output of the appropriate power supply, PS-240V or PS-120V, to the labeled connector on the rear of the printer.

  • Page 41: Safety Tests

    Safety Tests Safety Tests Philips safety tests meet the standards of, and are performed in accordance with IEC 601-1, Clause 19 (EN60601-1, Second Edition, 1988; Amendment 1, 1991-11, Amendment 2, 1995-03). The A1 patient monitor is a Class II device. It is double insulated and does not require a protective earth (ground) wire.
  • Page 42 Safety Tests Safety Test Diagram - Protective Earth Test or Inspection to Perform Measures impedance of Protective Earth (PE) terminal to all exposed metal parts of IUT, which are for safety reasons connected to the Protective Earth (PE). Max. 100 mOhm.

  • Page 43: Electrical Leakage

    Safety Tests Electrical Leakage The following tests verify the electrical leakage of the monitor: Earth Leakage Current (A3 only) Enclosure Leakage Current Patient Leakage Current Patient Source Current, with Mains Voltage on the Applied Part Perform all leakage tests any time the unit is opened. This test is in compliance with IEC 601-1 (Earth Leakage Current).
  • Page 44 Safety Tests Connect analyzer test cable to the snap as arrowed (or alternatively, to the handle fixing screw) NOTE: do NOT use this snap on the rear of the case, or any of the other screws on the rear of the monitor Turn the monitor on.
  • Page 45 Safety Tests Table 8 Enclosure Leakage Current EN60601-1 (1990 + A1, A2, A11, A12, A13) and UL2601 (2 Ed. 1997) US Deviations Test Condition Polarity Allowable Leakage Current Normal 100 µA Normal Reversed 100 µA Normal 150 µA S.F.C Open Supply Reversed 150 µA (A1 Only)
  • Page 46 Safety Tests Table 9 Patient Leakage Current Values Allowable Leakage Current (Max.) Test Condition Polarity Type CF Normal 10 µA Normal Reversed 10 µA Normal 50 µA S.F.C. (Open Supply) (A1 Only) Reversed 50 µA Normal 50 µA S.F.C. (Open Earth/Ground) (A3 Only) Reversed 50 µA...
  • Page 47 Safety Tests Safety Test Diagram - Patient Leakage Current - AC Test or Inspection to Perform Measures patient leakage current from Applied Part to earth caused by external mains voltage on Applied Part with switch S5 open and closed. Each polarity combination possible is tested using S2 and S6.
  • Page 48 Safety Tests Performance Verification...

  • Page 49: Power-Up Defaults Menu And Diagnostic Mode

    Power-up Defaults Menu And Diagnostic Mode Introduction This section discusses use of the Power-up Defaults Menu to configure power-on default settings, and the Diagnostic Mode to obtain service-related information about the monitor. Power-up Defaults Menu The purpose of the Power-up Defaults Menu is to allow the authorized user to create a power-up default for each setting in the monitor.
  • Page 50 Power-up Defaults Menu Menu Item* Choices** Explanation Accept Current If Yes is chosen, the current monitor Settings as Power-Up settings become the power-up defaults. Defaults? Adult/Neonatal Mode Neonatal mode is not available at this time; (A3 only) thus, when this item is selected, the following pop-up message will appear: Selection not available.
  • Page 51 Power-up Defaults Menu Menu Item* Choices** Explanation Language*** The language selected will be used for all English Dutch the text shown on the display; the selected French Turkish language will be effective the next time the German Arabic monitor is powered up. Italian Norwegian Note: Language selection screen upon...

  • Page 52: Diagnostic Mode

    Diagnostic Mode Diagnostic Mode The purpose of Diagnostic Mode is to allow factory, field-service, and hospital biomedical technicians access to a series of test and system-related information screens for the purpose of verifying monitor performance or troubleshooting problems. To access the Diagnostic Mode: Invoke the Power-up Defaults Menu.

  • Page 53: System Information

    Diagnostic Mode error code. Error codes cannot be changed or reset in this screen. When in the Error Code screen, the Return item is always highlighted; a press of the wheel returns the user to the Diagnostic Menu. Rotating the wheel while in the Error Code screen has no effect.

  • Page 54: System A/D Values

    Diagnostic Mode operational. This value can be reset to zero, for instance at the time when a technician installs a new recorder. • Battery Deep Discharges: Displays the number of deep-discharge cycles seen by the battery. The monitor records a deep discharge cycle when the battery volt-age reaches 5.6 volts, the voltage at which a Low Battery...

  • Page 55: Nibp Test

    Diagnostic Mode A/D Channel Designators RWAVE RWAVE PACEMAKER PACEMAKER TEMP 1 (93° TO 112°) RESPIRATION PRESSURE XDUCER 1 PRESSURE XDUCER 1 PRESSURE XDUCER 2 PRESSURE XDUCER 2 NiBP OSCILLATORY NiBP OSCILLATORY ECG LEAD OFF ECG LEAD OFF TEMP 2 (59° TO 93°) TEMPERATURE ISOLATED VOLTAGE REF ISOLATED VOLTAGE REF...
  • Page 56 Diagnostic Mode NiBP TEST Pressure (mmHg) Valve: OPEN Press NiBP to activate pump; release to stop pump. Press Volume to open valve; release to close valve. Alarm Silence Press to open proportional valve and deflate at 3 mmHg/s; release to close valve. Contrast Press to perform offset...

  • Page 57: Restoring Factory Settings

    Restoring Factory Settings is pressed, the proportional valve opens and bleeds off pressure at the rate of 3 ±1.5 mmHg/ s. It is useful to control the bleed rate to 3 mmHg/ second to facilitate certain AAMI SP10 tests. Any time the bleed rate falls below 3 mmHg/second, the valve opens and remains at maximum as long as the button is pressed.
  • Page 58 Restoring Factory Settings settings which were originally established at the factory: With the monitor powered off, simultaneously press the VOLUME CONTRAST buttons on the front keypad. While continuing to press the VOLUME and CONTRAST buttons, power- up the monitor. Continue to keep the VOLUME and CONTRAST buttons depressed until the power-up diagnostic sequence is complete.

  • Page 59: Troubleshooting

    Who Should Perform Repairs Only qualified service personnel should open the monitor housing, remove and replace components, or make adjustments. If your medical facility does not have qualified service personnel, contact Philips’ Response Center or your local Philips representative. Replacement Level Supported The replacement level supported for this product is to the printed circuit board (PCB) and major subassembly level.

  • Page 60: Obtaining Replacement Parts

    Refer to the section indicated for further troubleshooting instructions. Taking the recommended actions discussed in this section will correct the majority of problems you may encounter. However, problems not covered here can be resolved by calling Philips’ Response Center or your local representative. Problem Area Refer To: 1.
  • Page 61 Troubleshooting Guide problems. Condition Recommended Action 1. With external power 1. Ensure that the external power supply input (PS-120V supply connected or PS-240V) is plugged into an operational AC outlet the green of appropriate voltage and frequency. EXTERNAL 2. Disconnect the power supply output cable from the POWER indicator monitor.

  • Page 62: Troubleshooting Guide

    Troubleshooting Guide Condition Recommended Action 4. The A1 turns on, 1. Press the alarm silence button to terminate the then shuts off and audible alarm. Ensure that the external power supply sounds an alarm is connected and the green EXTERNAL POWER and no error code is indicator is lit.

  • Page 63: Error Codes

    Troubleshooting Guide Condition Recommended Action 2. The A3 turns on, 1. Press Alarm Silence switch to terminate audible then shuts off and alarm. Ensure AC power cord is connected and green sounds an alarm BATTERY CHARGING/AC SOURCE indicator is lit, and no error code is or ensure DC source is connected and green displayed.

  • Page 64: Serviceable Hardware Error Codes

    Troubleshooting Guide 4. Simultaneously press the button and the CONTRAST button to power up the monitor. Keep the contrast STANDBY button depressed until the monitoring screen appears (after 10 seconds). The error code printout is generated automatically. If error codes listed on the Diagnostic Mode error code screen or on the error log printout are in the range from 1 to 65 (hex), a hardware problem has been detected.
  • Page 65 Troubleshooting Guide Hex Code Explanation Recommended Action The measured value of the 1. Check power supply. isolated reference supply on the 2. Replace Main PCB. front end is low. The measured value of the 1. Check power supply. isolated reference supply on the 2.
  • Page 66 Troubleshooting Guide Hex Code Explanation Recommended Action NiBP Pressure Violation Error. 1. Cycle power. • The pressure on the cuff 2. Check for blocked tubing in could not be removed by the pneumatic system. normal means. 3. Replace Main PCB. •...

  • Page 67: Other Error Codes (All Monitors)

    4. If the Error Code screen indicates that the same error has occurred previously, take the monitor out of service and contact Philips’ Response Center or your local Philips representative for advice on remedial action. 5. If the Error Code screen indicates no previous occurrences of this error, the monitor can be returned to service.

  • Page 68: Buttons/Wheels (All Monitors)

    Troubleshooting Guide Code (hex) Explanation 508xxxx trend error 509xxxx flash memory data error 50axxxx error 50bxxxx ECG error 50cxxxx power-down task error 50dxxxx on-board diagnostic error 50exxxx power monitor error 50fxxxx temperature measurement error 510xxxx internal user interface error 511xxxx error handling error 513xxxx serial driver error...

  • Page 69: Display/Audible Tones (All Monitors)

    Troubleshooting Guide Display/Audible Tones (All Monitors) The following lists recommended actions to address problems with the display and audible tones. Condition Recommended Action 1. System powers-up Note: Pressing the A3 contrast adjust switch and… causes the LCD contrast setting to immediately change to normal, factory- •...

  • Page 70: Operational Performance

    Troubleshooting Guide Operational Performance The following lists recommended actions to address problems related to Operational Performance operational performance of the A1. Problems - A1 Condition Recommended Action 1. The monitor appears to 1. Replace each patient cable (or tubing) with a be operational, but the known good cable.
  • Page 71 Troubleshooting Guide Condition Recommended Action 3. Recorder paper will 1. Open recorder door and check paper is oriented advance but paper correctly; paper should exit from bottom of roll. remains blank when See User Guide for an illustration of correct paper printing should be orientation.
  • Page 72 Troubleshooting Guide Chapter 5 - Troubleshooting...

  • Page 73: Disassembly Guide

    Disassembly Guide Warning Performance verification: do not place the monitor into operation after repair or maintenance has been performed, until all recommended Performance Tests and Safety Tests listed in Chapter 3 of this service manual have been performed. Failure to perform all tests could result in erroneous monitor readings.

  • Page 74: How To Use This Chapter

    How To Use This Chapter Caution If the internal battery cable has been disconnected, pay particular attention to the polarity of the cable before reattaching. If the battery cable polarity is reversed, it is likely that circuit damage will occur. How To Use This Chapter The step-by-step procedures that are used to access replaceable parts of the monitor are illustrated in the Disassembly sections which follow.

  • Page 75: Disassembly Procedures (A1)

    This section describes the items that can be removed without disassembling the main case of the A1 monitor. Procedure to remove the battery from Models M3921A and M3923A when a temperature module is not installed: 1. Use a Phillips-head screwdriver to remove the two screws fastening the battery cover to the rear case.
  • Page 76 Disassembly Procedures (A1) 5. As required, remove the battery cushions on the inside of the battery compartment, and the battery cover. Foot cushions Battery cover Procedure to remove the battery from the monitor when a temperature module is installed: For models with temperature module Temp module 1.
  • Page 77 Disassembly Procedures (A1) 2. Remove the temperature module housing and the battery cover. Battery cover Removed temperature module housing 3. The probe sensor contact switch is mounted on the outer side of the battery cover. As required, disconnect the leads from the probe sensor switch to the rear panel connector.

  • Page 78: Separation Of Front And Rear Case Assemblies

    Disassembly Procedures (A1) compartment, and the battery cover. Foot cushions Battery cover Separation of Front and Rear Case Assemblies This section describes the procedures required to separate the front and rear case assemblies of the A1 monitor. Procedure to separate the front and rear case assemblies: 1.
  • Page 79 Disassembly Procedures (A1) Rear case assembly Front case assembly During reassembly, align the ridge in the front case assembly with the groove in rear case assembly. The gasket snake break should be placed at the bottom of the unit. Line up the connector panel with the slots in the rear case, making sure speaker wire is out of the way.

  • Page 80: Front Case Disassembly Procedures

    Disassembly Procedures (A1) Caution During reassembly, pay particular attention to the polarity of the battery cable before reattaching. The polarity is marked on the circuit board. Red connects to the +ve terminal, black connects to the –ve terminal. If battery cable polarity is reversed, it is likely that circuit damage will occur.
  • Page 81 Disassembly Procedures (A1) 2. Remove the board by gently pulling to disconnect from LED connector. Pull straight back to avoid bending the pins. During reassembly, line up the LED connector when replacing the main PCB in the front case assembly, press gently into position, and feed the ribbon cable through the hole for the wheel.
  • Page 82 Disassembly Procedures (A1) Procedure to remove the display: Caution Perform this step in a dust-free environment to avoid damage to the LCD display. 1. Use a Phillips-head screwdriver to unfasten the four corner screws. These screws also hold the LCD assembly in place. 2.
  • Page 83 Disassembly Procedures (A1) Procedure to remove the speaker: 1. Remove the retaining spring clip. 2. Remove the speaker. 3. Orient the speaker wires towards the handle (as shown in the photograph). Handle Spare speaker, leads attached Procedure to remove the wheel and encoder: 1.
  • Page 84 Disassembly Procedures (A1) Procedure to remove the keypad: The keypad is attached with an adhesive to the front panel. 1. From the front side of the panel, carefully pry up one corner of the keypad from the cover, and then peel it away from the cover. 2.

  • Page 85: Rear Case Disassembly Procedures

    Disassembly Procedures (A1) Rear Case Disassembly Procedures This section describes the items that can be removed or replaced on the rear case assembly of the A1 monitor. First separate the front and rear assemblies as described in the section “Separation of Front and Rear Case Assemblies” on page 78.
  • Page 86 Disassembly Procedures (A1) Procedure to remove handle and foot cushions: Each end of the handle is friction-fit onto a cross-shaped boss. 1. Use flat-bladed screwdriver to carefully pry one end of the handle. 2. When the end of the handle has begun to loosen from the boss, use the same technique to begin to pry up the other end.

  • Page 87: Main Pcb Disassembly Procedures

    Disassembly Procedures (A1) Main PCB Disassembly Procedures This section describes the items that can be removed or replaced from the main PCB assembly of the A1 monitor. The main PCB assembly is separable from the front case assembly. First separate the front and rear assemblies as described in the section “Separation of Front and Rear Case Assemblies”...

  • Page 88: Connector Panel

    Disassembly Procedures (A1) Patient connector PCB assembly Main PCB assembly Foot of moulded connector panel after removal of Tinnerman nut Procedure to separate the patient connector PCB from the connector panel: 1. Use a Phillips-head screwdriver to remove four screws fastening the two assemblies together.

  • Page 89: Disassembly Procedures (A3)

    Disassembly Procedures (A3) Disassembly Procedures (A3) Closed Case Disassembly Procedures This section describes the items that can be removed without disassembling the main case of the A3 monitor. Procedure to remove front panel wheel: The wheel is friction-fit on the encoder shaft. 1.

  • Page 90: Separation Of Front And Rear Case Assemblies

    Disassembly Procedures (A3) Procedure to remove recorder: 1. Press the button on the right side of the recorder. The door Paper Eject drops forward. 2. Remove the paper roll, if installed. Two fastening screws are visible on the back panel of the recorder. 3.
  • Page 91 Disassembly Procedures (A3) Connector to recorder PCB NiBP tubing Main ribbon (when installed) cable assembly 4. Disconnect the large ribbon-cable connector from the main PCB. 5. Unscrew the NiBP tubing connector from the pump to the main PCB. The front and rear case assemblies are now completely separate from one another.

  • Page 92: Front Case Disassembly Procedures

    Disassembly Procedures (A3) Front Case Disassembly Procedures Procedure to remove SpO module, ECG/Temp connector assembly, and encoder assembly: • module: remove the three screws located at the corners of the module and lift off the ground wire and the foil shield. Then pull the SpO module straight up to disengage it from main PCB.
  • Page 93 Disassembly Procedures (A3) cable NiBP tubing Switch panel Encoder connector connector 2. Use a screwdriver to remove the six fastening screws around the periphery of the main PCB. Retain the fastening screws for reassembly. 3. Lift the main PCB slightly and unscrew the tubing connector near the NiBP front panel fitting.
  • Page 94 Disassembly Procedures (A3) Procedure to remove the switch panel: 1. The switch panel is attached with an adhesive to the front panel. 2. Carefully lift up one corner of the switch panel and peel it away from the front panel. When the switch panel is free, feed the connector through the slot in the front panel.

  • Page 95: Rear Case Disassembly Procedures

    Disassembly Procedures (A3) Rear Case Disassembly Procedures Procedure to remove the battery: 1. Use a screwdriver to remove the three screws holding the battery cover plate in place. 2. Grasp the strap, accessible through the opening in the top foam cover, and gently pull the battery from its housing.
  • Page 96 Disassembly Procedures (A3) Procedure to remove the recorder and the battery housing: 1. Remove the battery as described in the procedure on page 83. Carefully remove the two foam battery pads from the battery housing. 2. If a recorder is installed, remove it as described in the procedure on page 78.
  • Page 97 Disassembly Procedures (A3) 5. Carefully slide the battery housing from the rear case assembly. Screws fastening battery housing 6. Disconnect the speaker twisted-pair-connector from the power supply PCB. The speaker is mounted on one side of the battery housing. 7. If a recorder is installed, disconnect the ribbon cable from the recorder PCB.
  • Page 98 Disassembly Procedures (A3) Procedure to remove fuses: 1. Remove the AC power input fuses, as shown, using the fuse pullers. Fuse F1 Fuse F2 Procedure to remove the power supply assembly: 1. On the rear panel of the monitor, remove the eight screws holding the power supply assembly.
  • Page 99 Disassembly Procedures (A3) Main PCB NiBP pump Main ribbon assembly cable Chapter 6 - Disassembly Guide...
  • Page 100 Disassembly Procedures (A3) Chapter 6 - Disassembly Guide...

  • Page 101: Spare Parts

    Spare Parts Introduction Spare parts, along with part numbers, are listed in the tables that follow. Item No. corresponds to the callout number in Figure 1 through Figure 12. The Page Ref. indicates the page number of the relevant disassembly procedures in Chapter 6.

  • Page 102: Top Level Assembly

    Top Level Assembly Top Level Assembly Figure 1 A1 Top Level Assembly Drawing (1 of 2) Chapter 7 - Spare Parts...
  • Page 103 Top Level Assembly Figure 2 A1 Top Level Assembly Drawing (2 of 2) Chapter 7 - Spare Parts...

  • Page 104: Top Level Assembly

    Top Level Assembly Item Page Part No. Description Ref. M3921-60100 Battery Cover (no temperature module) page 63 M3922-60100 Battery Cover (with temperature module) page 64 M3921-60101 Battery page 63 M3921-60102 Battery Pads page 64 M3922-60200 Temperature Module Housing page 64 M3922-60201 Temperature Probe Sensor Switch page 63...
  • Page 105 Top Level Assembly Figure 3 A3 Top Level Assembly Drawing Chapter 7 - Spare Parts...
  • Page 106 Top Level Assembly Item Page Part No. Description Ref. All A3 Models M3926-60800 Handle page 77 Chapter 7 - Spare Parts...

  • Page 107: Front Case Assembly

    Front Case Assembly Front Case Assembly Figure 4 A1 Front Case Assembly Drawing (1 of 3) Chapter 7 - Spare Parts...
  • Page 108 Front Case Assembly Figure 5 A1 Front Case Assembly Drawing (2 of 3) Chapter 7 - Spare Parts...

  • Page 109: Front Case Assembly

    Front Case Assembly Figure 6 A1 Front Case Assembly Drawing (3 of 3) Connector Panel and Patient Connector PCB Item Page Part No. Description Ref. M3921-60400 Front Cover Assembly (with keypad and page 70 display window) M3921-60401 Display Shield page 70 M3921-60402 LCD Assembly page 70...
  • Page 110 Front Case Assembly Figure 7 A3 Front Case Assembly Drawing (1 of 2) Chapter 7 - Spare Parts...
  • Page 111 Front Case Assembly Figure 8 A3 Front Case Assembly Drawing (2 of 2) Chapter 7 - Spare Parts...
  • Page 112 Front Case Assembly Item Page Part No. Description Ref. All A3 Models M3921-60406 Wheel page 77 M3926-60400 module page 80 M3926-60305 Connector/cable, ECG/temp page 80 M3921-60407 Encoder page 80 M3926-60600 NiBP fitting and tubing page 81 M3926-60401 Cable, SpO page 80 M3926-60304 Switch panel page 82...

  • Page 113: Rear Case Assembly

    Rear Case Assembly Rear Case Assembly Item Page Description Part Ref. M3921-68500 Rear Connector PCB (with ribbon cable) page 73 exchange M3921-60500 Rear Connector PCB (with ribbon cable) page 73 M3921-60501 Pump Clamp page 73 M3921-60502 Pump Pad page 73 M3921-60503 NiBP Pump, Fitting, and Tubing page 73...
  • Page 114 Rear Case Assembly Figure 9 A3 Rear Case Assembly Drawing (1 of 3) Chapter 7 - Spare Parts...

  • Page 115: Rear Case Assembly

    Rear Case Assembly Figure 10 A3 Rear Case Assembly Drawing (2 of 3) Chapter 7 - Spare Parts...
  • Page 116 Rear Case Assembly Figure 11 A3 Rear Case Assembly Drawing (3 of 3) Chapter 7 - Spare Parts...

  • Page 117: Main Pcb Assembly (A1)

    Cable, main ribbon page 86 Main PCB Assembly (A1) Page Part No. Description Ref. M3921-68600 Main PCB (Model M3921A) - exchange page 75 M3921-60600 Main PCB (Model M3921A) - new page 75 M3922-68600 Main PCB (Models M3922A/M3924A) page 75 exchange...
  • Page 118 There are two jumpers, marked JP101 and JP102 located immediately below the NiBP valve. Ensure that the jumpers are installed as noted in the table which follows. Model JP101 JP102 Number M3921A Installed Installed M3922A Installed Empty M3923A Empty...

  • Page 119: Power Supply, Cables, And Miscellaneous Parts

    Power Supply, Cables, and Miscellaneous Parts Power Supply, Cables, and Miscellaneous Parts Figure 12 A3 Power Supply/Heat Sink Assembly Drawing Chapter 7 - Spare Parts...
  • Page 120 Power Supply, Cables, and Miscellaneous Parts Part No. Description M3921-61000 Power Supply Assembly - 110V M3921-61010 Power Supply Assembly - 220V Item Page Part No. Description Ref. M3926-60700 Power Supply Assembly-new part page 86 M3926-68700 Power Supply Assembly-exchange part page 86 Located in Small Fuse, 0.75A, slo-blow, 250V, 5x20 mm page 86...
  • Page 121 Power Supply, Cables, and Miscellaneous Parts Applies To Part No. Description · · 8120-8376 Power Cord, China (922) 2.0m · M3926-60801 Feet · M3926-60402 Door · M3926-61000 DC Input Cable · M3926-61010 Defib Sync Cable · · M3921-61030 Nurse Call Cable ·...

  • Page 122: Exchange Unit Part Numbers

    Exchange Unit Part Numbers Exchange Unit Part Numbers Part Number Description M3925-60000 Thermal Recorder for A1 Patient Monitor GSI M3921-68020 A1 Patient Monitor, Exchange Unit M3922-68020 A1 Patient Monitor, Exchange Unit M3923-68020 A1 Patient Monitor, Exchange Unit M3924-68020 A1 Patient Monitor, Exchange Unit Part Number Description M3927-62000...

  • Page 123: Packing For Shipment

    If the original shipping carton is not available, use another suitable carton. Prior to shipping the monitor, contact your Philips Response Center for a returned goods authorization (RGA) number. Mark the shipping carton and any shipping documents with the RGA number.
  • Page 124 Repacking In A Different Carton Chapter 8 - Packing For Shipment...

  • Page 125: Rs-232 Interface

    Anyone who connects additional equipment to the signal inport port or signal output port configures a medical system and is therefore responsible to ensure that the system complies with the requirements of system standard IEC Standard 601-1-1. If in doubt, consult Philips’ Response Center or you local Philips representative. •...

  • Page 126: Cable Connections

    Cable Connections Cable Connections The 9-pin connector mounted on the rear panel provides an access port for a serial (RS-232) interface to a suitably configured personal computer. Or, alternatively, qualified service personnel can use the connector to send a Nurse Call signal. Pin # Signal Direction...

  • Page 127: Training Program

    Training Program Introduction The purpose of this chapter is to provide a complete, flexible training program that addresses the needs of technical personnel who service the monitor at all levels of involvement. The training is self-paced. This chapter guides you through the entire service training program.

  • Page 128: Training Materials

    Essential Materials The essential materials to complete this training: • This A1 & A3 Service Guide (M3921-9000C) For Philips Service Personnel, a Training Completion Form must be signed and returned to your supervisor referencing the course number "MWPMD- A1/A3SUPP". Optional Materials Optional materials that can assist you in this training: •...

  • Page 129: Overview

    This section provides a high level overview of the monitors and their options. Model Measurement Parameters and Features NiBP Temp Resp Integral Color/ Recorder Mono A1 Monitor M3921A Mono M3922A Mono M3923A Mono M3924A Mono M3925A Optional Standalone Recorder for A1 A3 Monitor...

  • Page 130: Support Strategies

    These tests are listed in detail along with the Test Map in Chapter 3. At the Philips parts center, we will stock the board level assemblies and mechanical parts based on existing failure data and customer demand. These parts are listed in Chapter 7.

  • Page 131: Theory Of Operation And System Architecture

    General This section contains a high level overview of the theory of operation of the major functional modules of the monitor. Philips service providers perform Bench Repair at the assembly level. For this purpose, they should review this high level information.

  • Page 132: Block Diagram - A1

    Theory of Operation and System Architecture Block Diagram - A1 Figure 1 A1 Block Diagram Chapter 10 - Training Program...

  • Page 133: System Overview - A3

    Theory of Operation and System Architecture System Overview - A3 The A3 is a full function monitor for use on adult and pediatric patients. The functions performed by the system include monitoring patient ECG, heart rate, respiration rate, blood pressures, blood oxygen saturation, and temperature.
  • Page 134 Theory of Operation and System Architecture Block Diagram - A3 Figure 2 A3 Block Diagram Isolated Front End The Isolated Front End section includes all the circuitry to convert ECG, Chapter 10 - Training Program...
  • Page 135 Theory of Operation and System Architecture SpO2, and temperature measurements to digital format and to connect this information to the processor. The respiration detection is obtained from two of the three electrodes of the ECG connections. Galvanic isolation of these circuits from the remainder of the monitor is accomplished by utilizing an isolated power supply and by incorporating opto-isolators between the Front End outputs and inputs to the microprocessor computation and control circuitry.
  • Page 136 Theory of Operation and System Architecture no monitoring is performed. However, the batteries are charging if either an AC or DC power source is connected to the rear panel. The alarm silencing switch is connected directly to the processor and to the system power supply.
  • Page 137 Theory of Operation and System Architecture 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.
  • Page 138 Theory of Operation and System Architecture Printing is accomplished on 50 mm wide thermal paper at recorder speeds programmable up to 50 mm/s. ECG Processing The technique used in ECG senses the varying potential difference between two points at the skin surface which respond to the electro-chemical actions of the muscular activity of the heart.
  • Page 139 Theory of Operation and System Architecture oscillation increases sharply is defined as systolic pressure. As the cuff continues to deflate, oscillation amplitude increases to a maximum, and then decreases. The peak oscillation amplitude is defined as the mean arterial pressure. The point at which the system detects a rapid decrease in oscillation is defined as the diastolic pressure.

  • Page 140: Troubleshooting

    Troubleshooting Troubleshooting Service personnel concerned with troubleshooting should review the following topics in this manual: • Error Codes (see Chapter 5) • Boot Sequence (see Chapter 3) • Performance verification (see Chapter 3) This is intended to be a practical, hands-on part of the training program. If possible, therefore, use a monitor to help you learn about troubleshooting the monitor.
  • Page 141 For monitors that are defective on arrival, first go through points 1 to 4 in the troubleshooting table above. If these are not successful, and a replacement monitor is necessary, please contact an Philips sales representative to arrange a replacement.

  • Page 142: Disassembly

    Disassembly Disassembly Disassembly procedures are described in the disassembly guide in Chapter 6. Please read the whole chapter. Whenever the monitor has been opened, there are specific steps regarding reassembly, described in the disassembly instructions in Chapter 6, that must be followed.

  • Page 143: Preventative Maintenance

    Preventative Maintenance Preventative Maintenance This part of the training program shows you how to carry out effective preventative maintenance. For the tools required for this, see page 10 of this service guide. Please read: • Routine Maintenance - Chapter 2 Please review: •...
  • Page 144 Preventative Maintenance Chapter 10 - Training Program...

  • Page 145: Index

    Index Cautions, 1 ECG connector, 82 Channel designators encoder assembly, 82 Accessories analog-to-digital, 43 LCD, 84 understanding, 3 Cleaning, 5 main PCB, 82 Alarms Closed case disassembly. See module, 82 Alarm Underway condition, 29 Disassembly procedures switch panel, 84 and alarm silence, 14 Connector panel temp.
  • Page 146 Index Error codes, 40 window removal, 72 and audible alarm tone, 53 LED excitation test, 17 Handle hex codes, 55, 56 removal, 79 hexadecimal representation, 53 A1 series models, 76 other, 58 A3 series models, 79 general categories, 58 Main PCB Hardware and software tests, 14 serviceable hardware checking fuse F301, 52...
  • Page 147 Index pneumatic assembly pneumatic system explanation, 37 removal from main PCB, 77 verification, 20–25 Power-up defaults menu, 37–39 processing, 129 power-on self-test, 13 adult/neonatal mode, 38 pump RS-232 interface, 27 alarm silence period, 38 removal serial interface, 27 alarm suspend, 38 A1 series models, 75 testing, 14 auto-set limits, 38...
  • Page 148 Index documents, 133 ground integrity, 30 removal, 82 website, 133 patient leakage current, 34 troubleshooting, 56, 57 Repair AC on applied part, 35 processing, 129 support strategies, 120 Screwdriver testing, 14 Repair methods icon, 37 alarms and alarm silence, 14 bench repair, 120 Phillips-head, 63 dynamic operating range, 17...
  • Page 149 completion form, 118 other, 58 disassembly, 133 serviceable hardware UART, 121 for phone support/service, 117 A1 series models, 54 Unit exchange, 120 for preventative maintenance, 117 A3 series models, 56 Use models levels of involvement, 117 error messages, 50 common, 119 materials, 118 NIBP system faults essential, 118...

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