How do I perform Preventive Maintenance on the A-2000?
A-2000 Monitor System Checkout Procedure
The following test procedure should be performed periodically to ensure that the A-2000 is functioning properly.
IF ANY FAILURES ARE NOTED, SEE ERROR MESSAGE AND OPERATOR ACTIONS SECTION OF THE OPERATING OR SERVICE INFORMATION MANUALS |
- Secure all components.
- Monitor with power cable
- DSC
- PIC (Patient interface cable, connects DSC to patient)
- BIS Sensor or test sensor or Sensor Simulator.
- Connect power cable to monitor, plug power plug into appropriate wall outlet.
- Power up monitor by pressing power switch (right lower side of case).
- Verify beep tone as power switch is activated.
- Verify fan (rear case wall) moves air outward.
- Verify all power on self-tests complete successfully (approx. 30 seconds).
- Verify next screen says "CONNECT DSC CABLE TO FRONT OF MONITOR."
- Connect DSC with PIC and Sensor (or Test Sensor or Sensor Simulator).
- Verify DSC test completes.
- Verify SENSOR CHECK screen displays.
- Exit from SENSOR CHECK screen by passing impedance check or by exiting with MENU/EXIT key.
- Disconnect power cord from rear of monitor.
- Verify ‘OPERATING ON BATTERY BACKUP (E33)’ is displayed.
- Verify battery icon displays in BIS banner.
- Reconnect power cord.
- Verify battery icon is not displayed in BIS banner.
- Verify no ‘OPERATING ON BATTERY BACKUP (E33)’ is displayed.
- Perform keyboard checkout:
- Press SILENCE key: Verify icon shows at BIS banner.
- Press ARROW BACK key: Verify REVIEW MODE screen displays.
- Press MENU/EXIT key: Verify REVIEW MODE screen exits.
- Press ARROW AHEAD key: Verify REVIEW MODE screen displays.
- Press MENU/EXIT key: Verify REVIEW MODE screen exits.
- Press MENU/EXIT key: Verify Setup menu displays.
- Press DOWN ARROW key: Verify highlight bar moves down with each press.
- Press UP ARROW key: Verify highlight bar moves up with each press.
- Press SELECT key: Verify that highlighted menu line is selected.
- Press MENU/EXIT until BIS banner is displayed.
- Check real time:
- Press MENU/EXIT key
- Use the arrows to highlight “Advanced Setup”, then press SELECT key.
- Verify that the time and date are correct for the local area. If incorrect, follow the instructions in Section II of the A-2000 Operating Manual to reset.
- End of checkout.
DSC Checkout Procedure
Periodically the DSC and associated cables and connectors should be inspected for physical damage and verification that the self test will pass.
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IF ANY FAILURES ARE NOTED, SEE ERROR MESSAGE AND OPERATOR ACTIONS SECTION OF THE OPERATING OR SERVICE INFORMATION MANUALS |
- Using a known good A-2000 monitor, power up the A-2000 and verify the screen message “Connect DSC Cable to Front of Monitor” displays.
- Connect the DSC that you are testing and verify the screen message “Connect Sensor to DSC” displays.
- Perform DSC Self Test.
- Repeat DSC Self test while flexing cables to see if intermittent opens or shorts exist.
- If PIC and Sensor are available, perform PIC Checkout Procedure.
- Repeat Sensor check while flexing cable to see if intermittent opens or shorts exist.
Patient Interface Cable (PIC) Checkout Procedure
The Patient Interface Cable (PIC) checkout is done using the A-2000 monitor’s Sensor Check routine and a Sensor Simulator or Test Sensor.
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IF ANY FAILURES ARE NOTED, SEE ERROR MESSAGE AND OPERATOR ACTIONS SECTION OF THE OPERATING OR SERVICE INFORMATION MANUALS |
Using a known good A-2000 monitor and a known good DSC, connect the PIC to be tested to the DSC and the DSC to the A-2000 monitor.
Power ON the A-2000 monitor and DSC. At the completion of the power up self-test, verify that the screen message “Connect Sensor to DSC” displays.
Connect a Sensor Simulator or Test Sensor to the PIC cable. Press firmly together.
A sensor check is initiated automatically when the sensor and PIC are connected to the DSC. (It may also be initiated by the user in the Setup Menu.) The impedance value for each electrode, in kilo ohms, appears on the screen along with its status:
PASS - An electrode passes if the impedance for that electrode is less than 7.5 kilo ohms. The ground electrode must be less than 100 kilo ohms to pass.
HIGH - An electrode is labeled "HIGH" if its impedance value is above 7.5 kilo ohms. As long as the combined impedance is less than 15 kilo ohms, the Sensor Check will be considered successful. If the combined impedance is over the 15 kilo ohms limit, you will need to re-prep the electrodes and check all connections. The monitor will continue to check impedance until it is acceptable.
NOISE - If the signal from the electrode goes beyond the measurable range, the label "NOISE" will appear.
LDOFF - If a lead is too loose or disconnected, the label "LDOFF" will appear.
NOTE: Sensor Check is used in clinical application as an indicator of the patient’s skin conductivity. When used with a Sensor Simulator or Test Sensor, it serves the purpose of verifying the DSC and PIC cable conductors. Therefore the status indications called out above need to be interpreted as conditions relating to the DSC and PIC ability to conduct the sensor check signal. Values that are too high must be investigated as possible failures to be repaired.
Expected Impedance Values
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Sensor Simulator Values |
Test Sensor Values |
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|
Electrode # |
Typical |
Range |
Electrode |
Typical |
Range |
|
1 |
5 K Ohms |
4-6 K Ohms |
1 |
1 K Ohms |
1-2 K Ohms |
|
2 |
10 K Ohms |
8-17 K Ohms |
2 |
1 K Ohms |
1-3 K Ohms |
|
4 |
4 K Ohms |
3-5 K Ohms |
4 |
1 K Ohms |
1-2 K Ohms |
|
3 |
3 K Ohms |
2-4 K Ohms |
3 |
1 K Ohms |
1-2 K Ohms |
Repeat the Sensor Check. Press the MENU/EXIT key, then press ARROW key to highlight the SENSOR CHECK line on the menu. Press SELECT key to initiate the Sensor Check routine again. During the Test sequence, flex the cable and connections at the PIC/SENSOR, and PIC/DSC and also the DSC box to Patient end cable. Note that gentle flexing of these cables and connectors should not cause the Sensor Check to fail.
Physical Integrity Inspection
Periodically check the system (A-2000 Monitor, DSC, PIC cable) for physical damage to cases, and associated cables and connectors.
Inspect the cases of the monitor and the DSC to insure plastic is not cracked or broken
Inspect the gasket seal around the case joining surfaces to insure the integrity of the splash resistance seal.
Inspect the cables and strain relief mechanisms.
Inspect the connectors for damage, faulty strain relief or contamination
Source: A-2000 XP Service Information Manual P/N 075-0014 Rev. 1.00.
For technical assistance contact:
In the U.S.A.:
Technical Service Department
Aspect Medical Systems, Inc.
Tel: 800-442-2051 (USA)
Tel: 617-559-7000 (USA)
Email: techsupport@aspectms.com
Outside the U.S.A.:
Technical Service
Aspect Medical Systems B.V.
Haagse Schouwweg 8b
NL – 2332 KG Leiden
Tel: +31-715 725 935
