Troubleshooting Guide - Nellcor NPB-75 Service Manual

Section 5: Troubleshooting
5.6

TROUBLESHOOTING GUIDE

5-2
If you encounter a problem that cannot be resolved through a visual
inspection, refer to Table 5-1: "Troubleshooting Guide" which provides a
list of symptoms, probable causes, and recommended actions to take to
correct the problem. It is recommended that corrective actions be
performed in the order presented. For a symptom that is not listed in
Table 5-1: "Troubleshooting Guide", contact your local distributor.
If a Caution or Advisory message is displayed on the LCD, refer to
Table 5-1: "Troubleshooting Guide"for the indicated failure and corrective
action. Caution messages appear on the display screen followed by !! and
Advisory messages are followed by !.
Check in the Service Mode for any Error Code and refer to Table 5-3:
"Event Messages"for the indicated failure and corrective action.
Table 5-1: Troubleshooting Guide
Symptom Probable Cause
The unit does not The battery pack is
turn on when the missing or is installed
ON/OFF button incorrectly.
is switched ON
when the unit is
operated with
batteries.
The battery pack's
charge is low.
The battery pack's
contacts are defective.
The contacts for the
battery pack on the CO
board are defective or a
CO
has failed.
The unit does not The ON/OFF button has
turn on when the a mechanical defect.
ON/OFF button
is switched ON
when the
monitor is
connected to
mains line
power.
A CO
has failed.
2
board component
2
board component
2
Corrective Action
Check if there is a
battery pack in the
monitor, if not, place
one in the monitor. Be
sure the battery pack
is installed correctly.
Install a fully charged
battery pack; charge
the empty battery
pack.
Install a new battery
pack and check the
monitor functions.
Connect the monitor
to mains line power
and if the monitor
functions, replace the
CO board.
2
Inspect the button for
cracks, deformations
or other damage.
Replace with a new
button.
Replace with a new
CO board.
2