Nellcor N-180 Service Manual page 47

Section 5: Troubleshooting
Table 5-8: AC Operation
Probable cause Action
The battery is discharged and the To restart the monitor set
Power switch is set to OFF. ON/STDBY switch to STDBY,
set Power switch to ON, and set
ON/STDBY SWITCH to ON .
The battery is discharged and the To restart the monitor set
AC power source is defective. ON/STDBY SWITCH to
STDBY. Connect the AC power
cord to a known good power
source. Set Power switch to ON
and set ON/STDBY to ON.
Defective monitor Contact qualified service authority
Defective AC Input assembly Replace the AC input assembly
Blown fuse Replace AC fuse
Defective power transformer. Replace the power transformer
Defective CPU PCB Replace the CPU PCB
No Audio (second case) The monitor is not connected to an AC power source,
all displays and indicators are dark, and the power-
up audio (dual-tone beep) is missing.
Table 5-9: Battery Operation
Probable cause Action
The battery is discharged. To restart the monitor set
ON/STDBY switch to STDBY.
Connect the AC power cord to a
known good power source. Set
Power switch to ON and set
ON/STDBY to ON.
The battery is discharged and the To restart monitor set ON/STDBY
AC power source is defective, switch to STDBY, connect AC
power cord to a known good AC
outlet, set Power switch to ON,
and set ON/STDBY switch to ON.
Defective monitor Contact qualified service authority
Defective CPU PCB Replace CPU PCB
5-9