Nellcor N-180, Manual

Page: 42 / 83

N-180 Pulse Oximeter Service Manual
5-16
Rear Panel
Rear panel interface component symptoms occur in the following categories:
• DIP Selector Switch
• Power Switch
• RS-232 Communications Port
Table 5-17: DIP Selector Switch Troubleshooting Chart
Symptom Probable cause Action
No NEO LED Incorrect DIP switch
setting
Refer to monitor
operator’s manual
for correct switch
settings
Cannot change alarm
limits from Adult to
Neo or vice versa
Defective monitor Contact qualified
service authority
Cannot change baud rate Defective CPU PCB. Replace CPU PCB.
The Power switch must be set to ON to operate the monitor on AC power and
to charge monitor batteries when the ON/STDBY switch is set to STDBY. The
Power switch problems can be caused by the conditions listed in table 5-18.
Table 5-18: Power Switch Troubleshooting Chart
Symptom Probable cause Action
Monitor does not
charge battery
Defective monitor or
power cable
Contact qualified
service authority
BATT IN USE indicator
lighted when Power
switch is set to on
Defective AC input
assembly
Replace AC input
assembly
Table 5-19 lists symptoms, probable causes and actions that apply to the
RS -232 port.
Table 5-19: RS-232 Communications Port Troubleshooting Chart
Symptom Probable cause Action
Garbled output Incorrect DIP switch
baud rate settings
Refer to monitor
operator's manual
for correct switch
settings.
Defective peripheral
device
Replace peripheral
device
Defective or incorrect
interface cable.
Check interface cable,
replace if required.
Defective monitor Contact qualified
service authority
No signals on send and
receive lines
Defective CPU PCB
(optical isolators or
drivers)
Replace CPU PCB.