Troubleshooting
Maintenance, Troubleshooting, and Repair
7-111
Repair
Once the problem has been localized to a specific hardware device or software application,
causes of the problem can be identified and corrective actions taken.
Philips
Hardware
For most Philips system hardware -- processing units, displays, printers, switches, repeaters,
media translators -- the User’s Manual provided with the unit is the primary source of
repair information. Refer to the User’s Manual for proper troubleshooting, maintenance, and
repair procedures for these units.
UPS One exception is troubleshooting and repair of the UPS. The following table gives
Symptoms, Possible Causes, and Corrective Actions to be followed for problems with
the UPS.
Notes The following table departs slightly from a similar table given in the APC UPS User’s
Manual and should be followed instead of that table.
The most common problems encountered are:
- tripped UPS circuit breaker due to excessive loads.
Remove the excess loads and reset the circuit breaker.
- incorrect rear panel switch settings.
Switch settings for 120V models are shown in Figure 2-27.
Table 7-12. Troubleshooting the UPS
Symptom Possible Cause Corrective Action
UPS will not turn on (lamp within
power I/O switch is not
illuminated), but beeps when power
I/O switch is on.
Rear panel circuit breaker is tripped
(Circuit breaker is tripped when button is
extended.)
Unplug excessive loads and press button to
reset breaker.
Line cord plug is not properly connected Check line cord plug and engage it properly
No power at wall socket Check power at wall socket and establish
proper power
UPS operates normally, but SITE
WIRING FAULT indicator is
illuminated
Building wiring error, such as a missing
ground, hot and neutral polarity reversed,
or overloaded neutral wiring.
A qualified electrician should be called to
correct the building wiring problem. The
UPS will not provide rated noise and surge
suppression with incorrect building wiring.
Ground not connected, e.g. “cheater” plug
or adapter installed on line cord plug
Plug the UPS into a proper 3 wire grounded
outlet only
UPS occasionally emits a beep, but
connected equipment operates
normally
The UPS is briefly transferring the
equipment to its alternate power source
due to incoming power spikes or sags
This operation is normal. The UPS is
protecting connected equipment from
abnormal line voltages. If the audible alarm
becomes annoying, set option switch #1 to
its up position.
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