Normal Audio When Power Is Applied; 5-11: Missing One Or More Displays Or Indicators - Nellcor N-180 Service Manual

Audio Present
Section 5: Troubleshooting
Missing all message indicators, but power-up audio (dual-
beep tone present) is normal.
Table 5-10: Normal Audio When Power is Applied
Probable cause Action
Defective monitor
Defective connection between the
LED Drive and LED PCBs.
Defective display components on the
LED PCB.
Defective display decoder and driver | Replace the LED Drive PCB.
ICs on the LED Drive PCB.
Defective CPU PCB. Replace CPU PCB.
Contact qualified service authority
Check the connectors labeled CN on
both PCBs.
Replace LED PCB.
Table 5-11: Missing One or More Displays or Indicators
' | Probable cause
Action
Defective monitor
Defective connection between the
LED Drive and LED PCBs.
Defective display components on the
LED PCB.
Defective display decoder and driver
ICs on the LED Drive PCB.
Contact qualified service authority
Check the connectors labeled CN on
both PCBs.
Replace LED PCB.
Replace the LED Drive PCB.
5-11