Dip Selector Switch Troubleshooting Chart; Power Switch Troubleshooting Chart - Nellcor N-180 Service Manual

N-180 Pulse Oximeter Service Manual.
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 Refer to monitor
setting operator's manual
for correct switch
settings
Cannot change alarm Defective monitor
limits from Adult to
Neo or vice versa
Cannot change baud rate | Defective CPU PCB.
Contact qualified
service authority
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 Defective monitor or Contact qualified
charge battery power cable service authority
BATT IN USE indicator | Defective AC input Replace AC input
lighted when Power assembly assembly
switch is set to on
RS-232 port.
© Table 5-19 lists symptoms, probable causes and actions that apply to the
Table 5-19: RS-232 Communications Port Troubleshooting Chart
516
Symptom Probable cause Action
Garbled output Incorrect DIP switch Refer to monitor
baud rate settings operator's manual
for correct switch
settings.
Defective peripheral Replace peripheral
device device
Defective or incorrect Check interface cable,
interface cable. replace if required.
Defective monitor Contact qualified
service authority
No signals on send and | Defective CPU PCB Replace CPU PCB.
receive lines (optical isolators or
drivers)