Mindray BeneVision N19, Service Manual

Page: 57 / 105

BeneVision N22/BeneVision N19 Patient Monitor Service Manual 4-7
4.7.5 Output Interface Failures
Fault Symptom Possible Cause Countermeasure
No output for the nurse call DCDC interface board cable loose 1. Verify the cable connecting the DCDC interface
board to the main board is properly connected.
2. Verify the cables and connectors are not
damaged.
DCDC interface board damaged Replace the DCDC interface board.
Main board failure Replace the main board.
USB Device Unusable
USB enumeration failure Restart the system.
Cable defective or improperly
connected
1. Verify the cable connecting the USB Hub board to
the main board is properly connected.
2. Verify the cables and connectors are not
damaged.
USB Hub board failure Replace the USB Hub board.
Main board failure Replace the main board.
4.7.6 Power Supply Failures
Fault Symptom Possible Cause Countermeasure
Battery cannot supply
power Battery damaged Replace the battery.
Cable defective or improperly
connected
1. Verify the cable connecting the battery interface
board to the power module is correctly connected.
2. Verify the cables and connectors are not
damaged.
DCDC interface board damaged Replace the DCDC interface board.
Battery cannot be recharged Battery damaged Replace the battery and charge fully. If this is
successful, the original battery is faulty.
Cable defective or improperly
connected
1. Verify the cable connecting the battery interface
board to the DCDC interface board is correctly
connected.
2. Verify the cables and connectors are not
damaged.
DCDC interface board damaged Replace the DCDC interface board.
No +3.3 V output
1. Power supply protected
2. DCDC interface board damaged
1. Turn off the patient monitor then restart it.
2. If the problem persists, disconnect the AC mains
for 5s and reconnect it, and then restart the patient
monitor.
3. If the problem persists, replace the DCDC interface
board.
No +5.0 V output
No +12 V output