Table 16. Switches/Knob Problems; Table 17. Alarms/Audible Tones Problems - Nellcor OxiMax N 5500 Service Manual

5.5.3 Switches/Knobs
Table 16 lists symptoms of problems and recommended actions to address problems
with the knob and front panel switches.
Symptom
1. N5500 fails to power-
up when Power On/Off
switch is pressed.
2. N5500 powers-up,
but some or one of the
other switches respond.
3. When knob is rotated,
no highlight appears on
display screen, and/or
monitor does not
respond to knob presses.
5.5.4 Alarms/Audible Tones
Table 17 lists symptoms of problems and recommended actions to address problems
with the display and audible tones.
Symptom
1. Alarm sounds for no
apparent reason
2. Audible alarm does
not sound.
3. N5500 responds to
switch press, but key
press tone fails to
sound.

Table 16. Switches/Knob Problems

1. Take steps as noted in paragraph 5.5.1.
1. Ensure Function switch PCB is plugged into Main PCB
assembly. If connection is good, change Function switch
PCB.
2. If problem persists, change Main PCB assembly.
1. Ensure encoder wire is plugged into Main PCB assembly.
If connection is good, change encoder.
2. If problem persists, replace Main PCB assembly.

Table 17. Alarms/Audible Tones Problems

1. Moisture or spilt liquids can cause an alarm not to sound.
Allow the monitor to dry thoroughly before using
2. If the problem persists, replace Main PCB assembly.
1. Check alarm silence status.
2. Verify alarm volume setting in Set-up menu.
3. Check 50 pi speaker connection. Ensure 50 pi speaker wire
is connected to rear communication PCB.
4. If problem persists, replace 50 pi speaker assembly.
5. Check the flat cable between main PCB and rear
communication PCB.
6. If problem persists, replace Main PCB assembly.
7. If problem persists, replace rear communication PCB.
1. Check Key Beep volume setting in Set-up menu.
2. Ensure 30 pi speaker wire is connected to rear
communication PCB.
3. If problem persists, replace 30 pi speaker assembly.
4. Check the flat cable between Main PCB and rear
communication PCB.
5. If problem persists, replace Main PCB assembly.
6. If problem persists, replace rear communication PCB.
N5500 Service Manual
Troubleshooting
Recommended Action
Recommended Action
41