NELLCOR PURITAN BENNETT Symphony N-3000 Service Manual page 59

5.6.3 Buttons/Knob
Table 5-4 lists symptoms of problems relating to nonresponsive buttons or the
Nellcor Puritan Bennett knob and recommended actions. If the action
requires replacement of a PCB, refer to Section 6, Disassembly Guide .
Table 5-4: Buttons/Knob Problems
Condition
1. The N -3000 turns on
but does not respond
to the knob (buttons
are operational).
2. The N -3000 responds
to some, but not all
buttons.
3. The N-3000 turns on
but does not respond
to either the knob or
any of the buttons.
Recommended Action
1. If possible, verify the problem with the service
mode, menu item 2, knob and lamp test.
2. Verify proper connection between knob and
UIF PCB.
3. If the condition still persists, replace the UIF
PCB.
1. Verify the problem and identify faulty buttons
with the service mode, menu item 3, button
test.
2. If faulty buttons are AUDIBLE ALARM
SILENCE button or NEW PATIENT/
NEONATAL button, replace UIF PCB.
3. If faulty buttons are on front panel, replace
Display PCB. If the buttons still do not work,
replace the UIF PCB.
1. Press the NEW PATIENT/NEONATAL button
twice rapidly. If the NEONATAL MODE
indicator lights, replace the Display PCB.
2. If the NEONATAL MODE indicator does not
light, replace the UIF PCB.
Section 5: Troubleshooting
5- 7