GE Cardiocap 5 Service Manual

							
Service Procedures 
7.3.6 AC/DC unit replacement 
1. Remove the 3 screws that hold the AC/DC unit to the backplate unit. 
2. Disconnect AC/DC–DC/DC cable from the DC/DC board. 
3. Disconnect the ground wire. 
4. Lift the AC/DC unit carefully up. 
7.3.7 DC/DC board replacement 
You may move the AC/DC unit out of the way first to improve access to the DC/DC board. 
1. Disconnect the DC/DC–AC/DC board cable from the DC/DC board. 
2. Disconnect the DC/DC–Mother board (red & black color) cable from the Mother board. 
3. Disconnect the DC/DC–Battery cable from the DC/DC board. 
4. Disconnect the Fan power cable from the DC/DC board. 
5. Remove the 3 screws from the heat sink from the backside of the inner-part unit. 
6. Remove the 6 screws that hold the board to the holder plate from the corners of the DC/DC board. 
7.3.8 Recorder unit replacement 
1. Press the recorder paper compartment release key on the front panel side. 
2. Take the paper roll out. 
NOTE: Be careful not to stain the thermal printer head. 
3. Loosen the 2 screws in the bottom of the compartment. 
4. Grab the recorder compartment and pull firmly. 
NOTE: If the recorder unit is stuck in the frame, remove the recorder unit’s metal cover from the 
backside of the front-cover unit and push the recorder out. 
7.3.9 Inverter board and Backlight board replacement 
1. Disconnect the CPU-Backlight board cable from the Backlight board. 
2. Remove the 3 screws that hold the Backlight board to the front-cover unit. 
3. Disconnect the Backlight–Inverter board cables (2 pieces) from the Inverter board. 
4. Remove the Inverter and Backlight boards together. 
Inverter board replacement 
Remember to reassemble all the washers and the O-ring or nylon spacers. Be careful not to drive the 
screws so tight that you break the Inverter board.  
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7.3.10 CPU battery replacement 
 CAUTION: Discard the lithium battery according to local regulations. 
Before replacing the battery, determine the monitor software version. Look on the small sticker on the 
rear of the monitor. The software version follows the dash after the part number (for example, in 
898716–1.0, the monitor software is version 1.0; in 898716–2.4, it is version 2.4). If you cannot 
determine the software version from the sticker, look at the Service View screen:  Press the ComWheel 
and select Monitor Setup – Install/Service (16-4-34) – Service (26-23-8).  
• For version 1.0, you must upgrade to the latest monitor software (see the Spare Parts chapter).  
• For version 2.4 or earlier, after replacing the battery you must reconfigure the monitor and, if the 
N-XNET or N-XDNET option is installed, load the N-XNET or N-XDNET software (see Spare Parts).  
• For version 2.5 or later, replace the battery as described below.  
1. Turn off the monitor and disconnect the power cord. Remove the cover. Use a screwdriver to 
carefully detach the battery from the D12 circuit on the CPU board. Align and install the new 
battery as shown below. 
 
Figure 7-1. CPU battery replacement 
2. Reassemble the monitor. 
3. Turn on the monitor and enter the Service View screen: Press the ComWheel and select Monitor 
Setup – Install/Service (16-4-34) – Service (26-23-8). 
4. If your monitor software is version 2.5 or later, go to step 7 (perform a factory reset).   
For version 2.4 or earlier, determine the frame (F-MX or F-MXG) and parameters for your monitor: 
If your monitor frame is F-MXG (monitor with D-fend), select Modules – Gas Unit – General and 
determine which parameters are available. 
NOTE: p&V means the same as Spirometry in Module Configurations. 
5. Return to the Service View screen, select Monitor – Configurations, and choose the Frame and 
Set that correspond to your monitor.  

						

							
Service Procedures 
7.3.11 CPU board replacement 
Important:  The new CPU board does not contain software or network options. If the network is 
required, make sure the CPU board supports the network. You must load the software after you replace 
the board. Refer to the Spare Parts chapter. 
1. Disconnect the following flat cables from the CPU board: 

						

							
Cardiocap/5 Technical Reference Manual 
7.3.13 Enhanced pulse oximetry (N-XOSAT) or SpO2 interface board replacement  
1. Disconnect the Mother board cable from the SpO2 interface board. 
2. Remove the 3 screws that secure the assembly cover to the front panel. 
3. Remove the 4 screws that secure the SpO2 interface board to the assembly cover. 
4. To remove the pulse oximetry board cover from the SpO2 interface board, gently bend the tabs to 
an upright position and lift the cover off.  
5. Remove the 4 screws that secure the OSAT pulse oximetry board to the SpO2 interface board and 
gently lift to separate the boards. 
6. Disconnect the OSAT board cable from the SpO2 interface board. 
7. Disconnect the connector board/cable assembly from the OSAT pulse oximetry board. 
 
Figure 7-2. SpO2 interface board 
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Service Procedures 
Installation notes (refer to figure 7-2):  

						

							
Cardiocap/5 Technical Reference Manual 
7.4 Adjustments and calibration 
You use service menus to perform procedures in this section. Once you have entered the Service View 
menu, you can enter and exit the specific service menus at which you make the adjustments.  
To enter the Service View menu, from which you access all other service menus: 
1. Press the ComWheel and select Monitor Setup. 
2. Select Install/Service and enter the password (16-4-34). 
3. Select Service and enter the password (26-23-8)  
The Service View menu is displayed. 
NOTE:  Refer to the Service Menus chapter for illustrations and detailed explanations of the service 
menus and screens. 
7.4.1 Pressure safety-level detection OFFSET 
The pressure safety-level adjustment trimmer is located on the NIBP board beside the calibration 
protection gear wheel. To access the pressure safety-level adjustment trimmer, you must detach the 
NIBP board from the NESTPR unit frame.  
 
 
Figure 7-3. NIBP board 
Tools 
Tube to transducer B2 
Trimmer 
• Troubleshooting extension cable (884298) 
1. Connect the NIBP board to the NESTPR connector on the mother board using the troubleshooting 
extension cable. 
2. Switch on the monitor.  
3. To enter the NIBP Pneumatics menu from the Service View menu, select:  
Modules 
NIBP 
Pneumatics 
4. Apply 13 mmHg/1.7 kPa (11 to 15 mmHg/1.5 to 2.0 kPa) pressure to pressure transducer B2 
with a precision manometer and adjust the trimmer to change the AD5 value on the screen from 
negative to positive. 
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Service Procedures 
7.4.2 NIBP calibration check 
NIBP pressure measurement electronics are calibrated at the factory. The processor maintains zeroing 
pressure automatically. If the zero point of the pressure transducer drifts more than specified, an error 
message is given and the NIBP board should be recalibrated or replaced. 
Checking the primary pressure channel calibration 
1. To check the primary pressure channel calibration, press the NIBP key and select NIBP Setup to 
open the NIBP Setup menu. 
2. If an NIBP hose is connected, disconnect it to expose atmospheric pressure to the pressure 
transducers. 
3. Select Calibration Check. 
Autozeroing is performed at start. The primary pressure is displayed. The zero-offset value should 
be zero.  
4. Reconnect the NIBP hose and pressurize to 200 mmHg (26.7 kPa). 
Using a manometer to check NIBP calibration 
1. To enter the NIBP Calibration service menu from the Service View menu, select:  
Modules – NIBP – Calibrations. 
2. Set Calibration Check to ON. 
3. Connect an external precision manometer to the NIBP connector. 
4. Manually pump the following pressures to the NIBP tubing and check the difference between the 
manometer and monitor pressure display for pressure channels B1 and B2: 
Pressure Maximum Error Example 
0 mmHg  (0 kPa) ± 9 mmHg (= zero offset) – 2 
100 mmHg (13.3 kPa) 100 + zero offset ± 2 mmHg 98 ± 2 
200 mmHg (26.7 kPa) 200 + zero offset ± 3 mmHg 198 ± 2 
If the error for pressure channel B1 is larger than specified above, recalibrate.  
The error for pressure channel B2 may be twice as large because it does not affect blood pressure 
measurement accuracy. When the B2 error is larger than specified above, however, recalibration is 
recommended to ensure the best possible operation. 
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Cardiocap/5 Technical Reference Manual 
7.4.3 NIBP calibration 
A hole in the middle of the monitor bottom plate provides access to a gear wheel for the Temperature and 
NIBP calibration protection switches. Turning the gear wheel moves a slide that operates the switches. 
CAUTION:  Turning the gear wheel more than 1/4 turn can damage the calibration switch. 
 
Figure 7-4. Calibration switch 
1. Detach the NIBP hoses from the front panel connector to enable proper zeroing. 
2. To enter the NIBP Calibration service menu from the Service View menu, select  
Modules – NIBP – Calibrations. 
3. If Protection is OFF and Calibration is highlighted, go to step 7. Otherwise, continue with step 4.  
4. Place the monitor on its left side. Insert a medium-sized, flat-head screwdriver into the hole that 
accesses the gear wheel for the calibration protection switches (see Figure 7-4). 
5. Turn the gear wheel approximately 1/4 turn counterclockwise until Protection is highlighted on 
the screen. Select Protection OFF and push the ComWheel. 
6. Turn the gear wheel approximately 1/4 turn clockwise until Calibration is highlighted. The 
”Calibration not protected” message appears in the NIBP digit field. 
7. With Calibration highlighted, push the ComWheel to start the calibration. The ”Zeroing” message 
will appear. After successful zeroing, the pressure adjustment bar will appear. 
8. Connect an external mercury manometer with pump to the NIBP connector through both tubes 
of the hose (transducers B1 and B2 must be calibrated simultaneously). Pump up to about 
200 mmHg (26.7 kPa) pressure, according to the manometer, to the NIBP tubing. Calibration 
is possible in the range of 150 to 300 mmHg (20.0 to 40.0 kPa). 
9. Verify that both pressure values on the screen match the manometer reading. If not, adjust by 
turning the ComWheel. When the values are equal, push the ComWheel to confirm the calibration. 
When the calibration data has been saved, the Calibrated message will appear. 
NOTE: When calibrating NIBP, always change the displayed pressure value slightly, even in cases 
where the value would be correct (that is, use the ComWheel to change the value one step higher 
and then back, one step lower, for example). The “Calibrated” message should be displayed. This 
process ensures that the calibration procedure is correctly registered and stored. 
10. Place the monitor on its left side. Insert a medium-sized, flat-head screwdriver into the hole that 
accesses the gear wheel for the calibration protection switches (see Figure 7-4).  
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Service Procedures 
11. Turn the gear wheel approximately 1/4 turn counterclockwise until Protection is highlighted. 
Choose Protection ON and push the ComWheel. Turn the gear wheel approximately 1/4 turn 
clockwise until Calibration and Protection become faint.  
12. Perform the NIBP calibration check (earlier in this chapter) to verify the new calibration. 
7.4.4 Temperature calibration 
Always calibrate the temperature: 
• When measured test values deviate more than ± 0.1 °C.  
• After replacing the STP board. 
Tools 
• Temperature calibration test plugs, 25 °C and 45 °C (884515) 
1. To enter the STP Calibrations service menu from the Service View menu, select  
Modules – ESTP :  STP – Calibrations 
2. Place the monitor on its left side. Insert a medium-sized, flat-head screwdriver into the hole that 
accesses the gear wheel for the calibration protection switches (see Figure 7-4). 
CAUTION:  Turning the gear wheel more than 1/4 turn can damage the calibration switch. 
3. Turn the gear wheel approximately 1/4 turn counterclockwise until Protection is highlighted on 
the screen. Select Protection OFF and push the ComWheel. 
4. Turn the gear wheel approximately 1/4 turn clockwise to highlight Calibrate T1 and choose 
Calibrate T1 (or highlight Calibrate T2 and choose Calibrate T2). 
5. Insert a calibration plug (25 °C) into the appropriate connector (T1 or T2). Push the ComWheel. 
6. Remove the plug and insert a calibration plug (45 °C) into the same connector. Push the ComWheel. 
7. To reset the protection, turn the gear wheel approximately 1/4 turn counterclockwise until 
Protection is highlighted. Select Protection ON and push the ComWheel. Turn the gear wheel 
approximately 1/4 turn clockwise until Calibration and Protection become faint. 
7.4.5 Invasive pressure calibration 
Calibrate invasive pressure when the pressure transducer (probe) is replaced with a different type of 
transducer and when the STP board is replaced. 
1. To enter the ESTP : STP Calibrations service menu from the Service View menu, select  
Modules – ESTP : STP – Calibrations 
2. Connect a pressure transducer to the P1/P2 connector.  
3. Choose Calibrate P1 or Calibrate P2.  
4. Expose the transducer to ambient pressure. 
5. Push the ComWheel to start zeroing. 
6. Connect a pressure manometer with a pump to the transducer dome. Pump a pressure of 
100 mmHg to 300 mmHg (13.3 to 40.0 kPa) to the transducer. The recommended 
pressure is 200 mmHg (26.7 kPa). 
7. Turn the ComWheel to adjust the pressure on the display to match the pressure reading on the 
manometer, then push the ComWheel. A tolerance of ± 1 mmHg is allowed. 
The “Calibrated” message will be displayed. 
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7.4.6 General checks for gas system components 
These faults can occur in the sampling system:  
• Leaks or blockages in the tubing. 
• Sampling pump or magnetic valves failure. 
• Diminished flow rates because of dirt accumulation in the internal tubing. 
The following checks should help in localizing the fault. Whenever you suspect the sampling system 
and always after you work on the sampling system, check and (if necessary) adjust the flow rate. 
CAUTION: The special internal sample tube is mechanically fragile. Sharp bends will cause leaks. 
Oxygen measuring (OM) unit 
CAUTION: Because of the complex and sensitive construction of the oxygen measuring unit, no repairs 
should be attempted inside the unit. If a fault is found in the measuring unit, the entire airway gas 
measurement unit should be replaced. Send the faulty unit to GE Healthcare for repair. 
In cases of no response to O2 or strong drift, check the tubing for loose connections, blockages, and 
leaks. 
CAUTION: To avoid permanent damage to the pressure transducer, never apply overpressure to the 
oxygen measuring unit. 
If the O2 signal is noisy, check the measurement unit suspension. 
TPX measuring unit 
If liquid enters the TPX measuring unit due to the failure of the water trap filter, contact GE Healthcare 
Technical Services. 
CAUTION: The TPX measuring unit can only be calibrated and repaired at the factory. In case of failure, 
the entire airway gas unit should be replaced and sent to GE Healthcare for repair. 
PVX measuring unit 
The PVX unit can be replaced in case of failure. 
NOTE: Never apply overpressure or negative pressure of more than 300 cmH2O to the flow and volume 
tubing. Also never apply differential pressure of more than 25 mmHg on one PVX connection at a time. 
Gas unit CPU board 
Due to the complexity of the large-scale integrated circuitry, few faults in the CPU digital electronics 
can be located without special equipment. Check only that socketed ICs are properly installed. 
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