Nellcor N-180 Service Manual page 53

Section 5: Troubleshooting
In table 5-14, the monitor is disconnected from an AC power source and the
ON/STDBY switch has no effect.
Table 5-14: Cannot Turn On Monitor (Battery Operation)
The battery is discharged and the
AC power source is defective,
Defective monitor
Defective AC input assembly
Defective power transformer
Probable cause Action
'The battery is discharged. To restart the monitor, set the
ON/STDBY switch to STDBY,
corinect the AC power cord to a
known good AC outlet, set the
Power switch to ON, and set the
ON/STDBY switch to ON
To restart the monitor, set the
ON/STDBY switch to STDBY,
connect the AC power cord to a
known good AC outlet, set the
Power switch to ON, and set the
ON/STDBY switch to ON
Contact qualified service authority
Replace the AC input assembly
Replace the power transformer
Defective CPU PCB Replace the CPU PCB
Table 5-15: Cannot Turn Off Monitor
Probable cause Action
Defective monitor Contact qualified service authority
Defective ON/STDBY switch Replace ON/STDBY switch
assembly assembly
Incomplete connection at CN1 or Verify connections at CN1 and CN5
СМ on the LED Drive PCB. on the LED Drive PCB.
Incomplete connection at CN2 on the | Verify connection CN2 on the CPU
CPU PCB. - PCB.
Defective CPU PCB. Replace CPU PCB.
Table 5-16: Push Buttons
- | Probable eause- Action- - 一
Defective monitor Contact qualified service authority
Incomplete connection at CN1 or
Verify connections at CN1 and CNG
TRATA Dreta
CN6-onthe LED Drive PCB.
Incomplete connection at CN2 on the
CPU PCB.
Defective CPU PCB.
on the LED Drive PCB.
Verify connection CN2 on the CPU
PCB.
Replace CPU PCB,
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