Cannot Turn On Monitor {Ac Operation) - Nellcor N-180 Service Manual

Front Panel Problems
Section 5: Troubleshooting
Front panel action table 5-12 lists possible defective components and
connections that could cause the symptoms noted in the related decision tree.
Table 5-12: Front Panel Control Knob
Probable cause Action
Defective monitor
Defective control knob assembly
' | Incomplete connection at CN1 or
CN7 on the LED Drive PCB.
Incomplete connection at CN2 on the
CPU PCB.
Defective CPU PCB.
Contact qualified service authority
Replace control knob assembly
Verify connections at CN1 and CN7
on the LED Drive PCB.
Verify connection CN2 on the CPU
PCB.
Replace CPU PCB.
ON/STDBY Switch
| In table 5-13 the monitor is connected to an AC power source. Operating the
ON/STDBY switch has no effect.
Table 5-13: Cannot Turn On Monitor (AC Operation)
- 'Probable cause
The battery is discharged and the
AC power source is defective.
Defective monitor
Action
The battery is discharged and the To restart the monitor set the
Power switch is set to OFF ON/STDBY switch to STDBY ,
set the Power switch to ON, and
then 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 power source. Set
the Power switch to ON and set
the ON/STDBY switch to ON.
Contact qualified service authority
Defective AC input assembly Replace the AC input assembly
Defective power transformer Replace the power transformer
Defective CPU PCB Replace the CPU PCB
Defective switch Replace switch
5-13