GE S5 Service Manual

							Display Unit for F-CM(C)1 (Rev. 04), F-CM(C)REC1 (Rev. 01)
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                                          Document no. M1031520-02
2.10.2 Serial data interface
The serial interface is an asynchronous RS-232 connection, which uses hardware flow control. The 
communication speed is 115.2 kbps. The communication uses the following parameters: Parity 
None, Data bits 8 and Stop bits 1.
2.10.3 Digital and analog outputs
Digital outputs
 There are separate digital outputs. Both signals use TTL level. The outputs are: Defibrillation Sync. 
and Nurse Call.
The Defibrillation Synchronization Signal is obtained from Synchronization connector X8, pin 2.
The Nurse call is obtained from Coding element connector X4, pin 8.
Defibrillation Sync indication is generated by ECG. When active, the signal is in state 1. After 10 ms 
the signal is reset to state 0. New Defibrillation Sync is not generated before the indication is 
deactivated. The delay from the R wave peak to the start of the signal is maximally 35 ms.
Nurse Call indication is generated by red and yellow alarms. When activated, it is set to state 1 and 
remains at that state until the alarm situation is over or 
SILENCE ALARM key is pressed.
The range of state 0 is from 0 to 0.8 V, and the range of state 1 is 2.8 to 5 V.
Analog outputs
Compact Anesthesia/Critical Care Monitor produces two analog real-time signals. The Direct ECG 
signal is available in Coding element connector X4 pin 7 and Synchronization connector X8, pin 3. 
The other signal is Invasive pressure output. It is available in Synchronization connector X8 pin 4.
NOTE:  When the source of the selected analog output becomes invalid (for example, transducer is 
disconnected), the last valid waveform information remains on the output and the numerical 
information is no longer valid.
Direct ECG 
Delay (max.): 15 ms
Gain ECG (out)/ECG (in): 1 V/1 mV 
NOTE: The direct ECG out signal is not available with modules M-ESTP rev. 01, M-EST rev. 00 and 
M-ETP rev. 00.
Invasive pressure signal: P1
Delay (max.): 25 ms
Gain Signal (out) / Pressure (in): 1V/100 mmHg
Pressure area 0…300 mmHg
The Invasive pressure output signal is 1 V/100 mmHg, originally ranging from 0 to 300 mmHg, and 
with a delay of approximately 25 ms. The signal requires an input impedance of 100 k.
2.10.4 Printer connection
For connecting a printer to the monitor, the serial data interface is used. When parallel printing is 
desired, a serial to parallel converter (ref. 78030) is needed.
For further information see Part I, Interfacing. 
						

							Datex-Ohmeda S/5 Compact Anesthesia and Compact Critical Care Monitors
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Document no. M1031520-02                                                                           
3 Service procedures
3.1 General service information
The field service of the S/5 Compact Anesthesia Monitor and S/5 Compact Critical Care Monitor is 
limited to replacing faulty PC boards and mechanical parts. Return the faulty PC boards to GE 
Healthcare for repair.
GE Healthcare is always available for service advice. Please provide the unit serial number, full type 
designation and a detailed fault description. 
CAUTION Only trained personnel with appropriate tools and equipment shall perform the tests 
and repairs outlined in this section. Unauthorized service may void the warranty of the 
unit.
3.2 Service check
S/5 Compact Anesthesia Monitor, F-CM(REC)1
S/5 Compact Critical Care Monitor, F-CMC(REC)1 
Display Unit
These instructions include complete procedures for a service check. The service should be performed 
after any service repair. Additionally, the service check procedures can also be used for determining 
possible failures.
The procedures should be performed in ascending order.
The instructions include a check form (“APPENDIX A”), which should be filled in when performing the 
procedures.
The symbol 
 in the instructions means that the check list should be signed after performing the 
procedure.
3.2.1 Recommended tools
Tool Order No. Notes
Power cord
Screwdrivers
MemCard - Menu for MemCard Option
MemCard - Data for MemCard Option
Anaesthesia Keyboard, K-ARKB
K-ARK interface cable 881154
Hemodynamic Module 
						

							Display Unit for F-CM(C)1 (Rev. 04), F-CM(C)REC1 (Rev. 01)
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                                          Document no. M1031520-02
3.2.2 Recommended parts
3.2.3 Before beginning
•
Make sure that the monitor is switched to standby.
•Disconnect the power cord and press the service reset switch until the LED next to it turns off.
•If the monitor is connected to the Datex-Ohmeda Network, disconnect the Mon-Net cable from 
the Frame Unit. Take out any memory cards, if installed.
•Detach the Display Unit from the Frame Unit.
•Open the Display Unit by detaching the Front Unit.
NOTE: Wear a static control wrist strap when handling PC boards. Electrostatic discharge may 
damage components on the board.
3.2.4 Visual inspection
1. DC/DC power supply board
Disconnect the DC/DC power supply board. Check the Display Unit – Frame Unit connector 
under the board:
• screws are tightened properly
• the connector is clean and intact

2. Central Processing Board
Check the Central Processing Board in the Display Unit:
•screws are tightened properly
•cables are connected properly
•all ICs that are on sockets are attached properly

3. DC/DC power board
Reconnect and check the DC/DC Power Board:
•screws are tightened properly
•all connectors are clean and intact
•the cables are attached properly

4. Net Unit and Synchronization Unit
Check that: Part Order No. Notes
Display Unit Fan filter  897010
Recorder paper 74205 for recorder unit 
						

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Document no. M1031520-02                                                                           
•screws are tightened properly
•the connector pins are intact

5. Front Unit
Check that:
•the Connector Board screws are tightened properly and the cable connectors are clean 
and intact
•the Inverter Board screws are tightened properly and the cable connectors are clean and 
intact
•the Backlight cables are intact and attached properly
•the keyboard foil cables are intact and attached properly to connectors on the Connector 
Board
•the Connector Board foil cable is intact and attached properly to the connector on the 
Central Processing Board
•the video signal foil cable is intact and attached properly to its connector on the Central 
Processing Board
Reattach the Front Unit.

6. External parts
Check external parts of the Display Unit:
•all stickers are intact
•the LCD display screen is intact
•the ComWheel cover is intact and attached properly
•all mechanical parts are functioning properly
Connect the Display Unit to the Frame Unit.

7.  Inserting module 
Check that the module used goes in smoothly and locks up properly in both module slots.
Leave the module connected. 

8. Fan filter
Clean or replace the Display Unit fan filter.
 
						

							Display Unit for F-CM(C)1 (Rev. 04), F-CM(C)REC1 (Rev. 01)
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                                          Document no. M1031520-02
3.2.5 Functional inspection
9. Stand-by LED
Connect the power cord.
Check that the standby LED starts blinking or is on continuously, if the batteries do not need 
charging.

10. Start-up
Switch the monitor on.
Check that the monitor starts up properly, i.e. the alarm LEDs turn blank, the start-up sound is 
heard from the loudspeaker and the normal monitoring screen appears.
No error messages should appear on the screen. 
If the monitor contains the recorder unit, two lines of start-up information should be recorded.

11. Monitor screen configuration
Configure the monitor screen so that all the needed parameter information is shown:
Monitor Setup
Screen 1 Setup
Waveform Fields
Digit Fields
Check that the selected parameter information is shown on the screen.
NOTE: InvBP waveforms are not shown without a patient simulator. Do no connect the simulator to the 
monitor at this stage.

12. Mark Event or Take Snapshot
Push the menu keys Help and Mark Event, or Take Snapshot.
Check that the picture on the LCD display screen is straight, clear and stable.

13. Time and date
Check that the time and date are correct, adjust them if necessary.
Monitor Setup
Set Time and Date
NOTE: The selection SET TIME AND DATE cannot be accessed if a case is started, or a patient has 
been admitted.
NOTE: If the clock shows time 0:00 continuously (at successive start-ups), the SRAM/TIMEKEEPER 
battery needs to be replaced. 
						

							Datex-Ohmeda S/5 Compact Anesthesia and Compact Critical Care Monitors
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Document no. M1031520-02                                                                           
The FACTORY RESET should be performed after the battery replacement, see “Performing 
Factory Reset” .

14. Loudspeaker
Check the loudspeaker by setting the alarm sound:
Alarms Setup
Alarm Volume
Test the whole volume scale from 1 to 10 by turning the ComWheel and check that the alarm 
volume changes correspondingly. The alarm sound should be clear and audible with all the 
settings.

15. Display brightness
Check the display brightness control: 
Monitor Setup
Display Brightness
Press the ComWheel and check that the display brightness follows the selected brightness.

16. Monitor software
Enter the service menu:
Monitor Setup
Install Service (Password 16-4-34)
Service (Password 26-23-8)
Take down the information regarding Monitor and Power Management Board software.

17. Content of service log
Select Service Log from the menu. 
Check the contents of the Service Log for possible problems. If the monitor contains the 
recorder unit, record the Service Log on the recorder by selecting Record Log.

18. Power supply output voltages
Check the power supply unit output voltages through the service menu:
Monitor Setup
Install Service (Password 16-4-34)
Service (Password 26-23-8)
Frame
Power Supply
The Display Unit voltages should meet the following ranges: 
						

							Display Unit for F-CM(C)1 (Rev. 04), F-CM(C)REC1 (Rev. 01)
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                                          Document no. M1031520-02

19. Watchdog circuitry
Test the watchdog circuitry:
Monitor Setup
Install Service (Password 16-4-34)
Service (Password 26-23-8)
Set/Test
Perform the tests WATCHDOG and WD BY OVERLOAD. Check that the monitor restarts in each 
case.
NOTE: When selecting WD BY OVERLOAD, restarting should take place approximately after
15 seconds.
 
Preset monitor settings: 
Record/Print
Record Waveforms
Waveform 1 --> ECG1
Waveform 2 --> P1
Waveform 3 --> P2
Delay --> Off
Paper Speed --> 6.25 mm/s
Length --> 30 s
20. Alarm LEDs
Enter the Keyboard service menu:
Monitor Setup
Install Service (Password 16-4-34)
Service (Password 26-23-8)
Keyboard
Select the text Upper Led. Check that the red alarm LED(s) is turning on and off when pressing 
the ComWheel. Check also the yellow alarm LED(s) by selecting Lower Led from the menu.

21. Membrane keys check
Press the keys on the monitor command board one by one. Check that each key generates a 
sound from the loudspeaker. Also, the corresponding text in the menu should change from 
yellow to red.+12V 11.50...12.50 V
+3.3 V 3.00...3.60 V
Vbus 10.00…17.00V
Depends on the power source 
						

							Datex-Ohmeda S/5 Compact Anesthesia and Compact Critical Care Monitors
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Document no. M1031520-02                                                                           
Check also the functioning of the side panel keys.

22. ComWheel check
Turn the ComWheel clockwise and counter clockwise and check that each step generates a 
sound from the loudspeaker and the corresponding values at the bottom of the menu increase.
Select Dummy Press. Press the ComWheel and check that the press generates a sound and the 
corresponding value in the menu increases.

23. K-ARK connector
Check that the command board section of the Anesthesia Keyboard functions normally through 
the K-ARK connector.

24. Module communication
Connect a patient simulator to the module.
Enter the ESTP: ECG service menu:
Monitor Setup
Install Service (Password 16-4-34)
Service (Password 26-23-8)
Parameters
ESTP: ECG
Check that the Timeouts, Bad checksums and Bad c-s by mod values do not increase faster 
than by 5 per second.
Change the module into the other slot. When the module is recognized, check that the values do 
not still increase faster than by 5 per second.

25. Battery
Enter the Battery service menu:
Monitor Setup
Install Service (Password 16-4-34)
Service (Password 26-23-8)
Frame
Power Supply
Battery
Check that the information on the page is correct.
 
						

							Display Unit for F-CM(C)1 (Rev. 04), F-CM(C)REC1 (Rev. 01)
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                                          Document no. M1031520-02
26. Battery voltage
Check that the shown Battery Voltage value is within 10 – 17V.

27. Monitor temperature
Check that the shown Monitor Temperature value is within 20 - 40.

28. Battery operation
Disconnect the power cord (without switching the monitor to standby).
Check that the monitoring continues normally. The battery indicator should appear in the upper 
right hand corner of the screen.

29. Reconnecting the power cord
Reconnect the power cord.
Check that the monitoring continues without problems. The battery indicator should be 
replaced by the text CHARGE.

Recorder Unit
30. Cover open recognition
Open the recorder unit cover. Check that the message ‘Recorder: Cover open’ appears on the 
screen, then close the cover.

31. Recording
Press the key 
Record Wave and check that the module starts recording the selected 
waveforms. Press the key 
Stop on the module to stop recording.
NOTE:  InvBP waveforms are not recorded without a patient simulator.
NOTE: If no recording appears, check that the paper roll is installed in a correct way. Only one side of 
the paper is printable.

32. Paper speed
Press the key 
Record Wave again and this time wait until the recording stops. Check that the 
length of the recorded waveform scale is 18.7 cm (± 1.5 cm).
Change the paper speed setting to 1 mm/s: 
						

							Datex-Ohmeda S/5 Compact Anesthesia and Compact Critical Care Monitors
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Document no. M1031520-02                                                                           
Record/Print
Record Waveforms
Paper Speed --> 1 mm/s
Press the key 
RECORD WAVE and wait until the recording stops. Check that the length of the 
scale is now 3.0 cm (± 0.5 cm).

33. Quality of recording
Check that the quality of the recording is acceptable.

MemCard option 
NOTE: The following steps are applicable only when the MemCard option is installed in the monitor.
34. Memory option recognition
Enter the Memory Card service menu:
Monitor Setup
Install Service (Password 16-4-34)
Service (Password 26-23-8)
Frame
MemCards
Check that the memory option is recognized properly, i.e. Present and Active state YES.

35. Memories and PCMCIA controller test
Check that the Memory board memories and the PCMCIA controller have passed their tests. The 
status for each should be OK.

36. Interface status
Select Communication. Check that Interface status states ACTIVE continuously and the error 
counter values at the bottom part of the menu are stable.

37. Menu Card recognition
Select Module Status. Insert a Memory card labelled Menu in the left hand side memory card 
slot. Check that the message ‘Menu Card inserted’ appears in the message field and the white 
menu card symbol in the upper right hand corner of the screen within 1 minute.
NOTE:  The battery symbol overrides the memory card symbols.