How To Diagnose Assembly Faults - GAI-Tronics 701-902 SmartSeries User Manual

®
701-902 S S H
MART ERIES

How to Diagnose Assembly Faults

When the assembly is in an ADVANCE system that includes a vacuum fluorescent display (VFD), faults
may be automatically detected, transmitted to the MCU in data messages, and displayed or printed. Fault
messages and possible solutions for their causes are described in the table below.
Fault Message
Watch-Dog timer
Processor has Reset
xd times
(Where x is the
decimal number of
times the watchdog
timer has reset the
processor.)
Stuck Contact on
Polled Device
Paging Pressbar
Depressed
Stuck Contact on
Polled Device
Handset Off-hook
Supervised Audio
Path
Handset
Supervised Audio
Path
Page Amp
f:\standard ioms - current release\42004 instr. manuals\42004-658l2g.doc
03/12
/S A
ANDSET PEAKER MPLIFIER
Cause and Effect
Cause—The watchdog timer has forced the
processor to reset. This occurs when the reset
pins (J2) on the Handset/FSK/P PCBA are
temporarily shorted or when the watchdog
timer does not receive regular status pulses
from U4 on the Handset/FSK/P PCBA.
Effect—The processor maintains a count of
the number of resets. If the station is powered
down, the count restarts at zero. The station
still amplifies incoming pages. For the fourth
and subsequent resets, the count is zero.
Cause—The station has been in page mode
longer than the configured page limit.
Effect—Station page is cut off. When the
pressbar is released, a restore message is sent
to the MCU. The station then resumes normal
operation.
Cause—The station has been in the off-hook
state longer than the configured time limit.
Effect—Station handset operation is cut off.
When the station is returned to the on-hook
state, a restore message is sent to the MCU.
The station then resumes normal operation.
Cause—The station failed its internal health
check of the Handset/FSK/P PCBA.
Effect—The station disables the handset
amplifier health-check function after the first
failure.
Cause—The station failed its internal speaker
amplifier health check.
Effect—The station disables the speaker
amplifier health-check function after the first
failure.
Pub. 42004-658L2G
11 of 14
P
AGE
Possible Solution

Verify that the reset pins
2 and 3 (J2) on the
Handset/FSK/P PCBA
are not shorted.

Replace the
Handset/FSK/P PCBA.

Verify that the handset
pressbar is not stuck.

Replace the
Handset/FSK/P PCBA.

Replace the Speaker
Amp/Power Supply
PCBA.

Verify that the handset is
not off-hook.

Replace the
Handset/FSK/P PCBA,
or cradle.

Replace the Speaker
Amp/Power Supply
PCBA.

Replace the
Handset/FSK/P PCBA.

Replace the Speaker
Amp/Power Supply
PCBA.
Replace the Speaker
Amp/Power Supply PCBA.