Chapter 5
Diagnostic Mode and Troubleshooting
REF 1029568 Rev B
BiPAP Focus Ventilator Service Manual © Respironics, Inc.
5-31
419
CBIT HIGH TEMP. VIO
User interface processor detected that the enclosure high temperature test failed
during CBIT (> 60
o
C).
1. Ensure that the system is at room temperature or within operating
specifications.
2. Enter Diagnostics mode and use the Sensor Readings screen to check
temperature and ADC readings.
3. If the problem persists replace the user interface PCB.
420-425
Unused
426
CBIT LOW TEMP. ALARM
UI processor detected low enclosure temperature (< 0
o
C).
1. Ensure that the system is at room temperature or within operating
specifications.
2. Enter Diagnostics mode and use the Sensor Readings screen to check
temperature and ADC readings.
3. Replace the user interface PCB.
427-431
Unused
432
3.3V VOLTAGE RAIL FAILED
User interface processor detected that the 3.3V test failed during CBIT.
1. If running on battery, ensure that the battery is fully charged.
2. Check if the problem occurs during AC and battery operation.
3. Enter Diagnostics mode and use the Sensor Readings screen to check the
voltage and ADC readings.
4. Replace the user interface PCB.
433
5.0V VOLTAGE RAIL FAILED
User interface processor detected that the 5.0V test failed during CBIT.
1. If running on battery, ensure that the battery is fully charged.
2. Check if the problem occurs during AC and battery operation.
3. Enter Diagnostics mode and use the Sensor Readings screen to check the
voltage and ADC readings.
4. Replace the user interface PCB.
434
12V VOLTAGE RAIL FAILED
User interface processor detected that the 12V test failed during CBIT.
1. If running on battery, ensure that the battery is fully charged.
2. Check if the problem occurs during AC and battery operation.
3. Enter Diagnostics mode and use the Sensor Readings screen to check the
voltage and ADC readings.
4. Replace the user interface PCB.
435
18VIN VOLTAGE RAIL FAILED
User interface processor detected that the 18VIN test failed during CBIT.
1. Check if the problem occurs during AC and battery operation.
2. Enter Diagnostics mode and use the Sensor Readings screen to check the
voltage and ADC readings.
3. Replace the user interface PCB.
436
CBIT 18VBOOST MONITOR
FAIL
User interface processor detected that the 18VBOOST test failed during CBIT.
1. If running on battery, ensure that the battery is fully charged.
2. Check if the problem occurs during AC and battery operation.
3. Enter Diagnostics mode and use the Sensor Readings screen to check the
voltage and ADC readings.
4. Replace the user interface PCB.
Table 5-3: Significant Event Codes (Continued)
Event ID
Comment / Corrective Action