Pub. 42004-645L2C
Model 723-801 SmartSeries
®
Remote Subset Amplifier
Page: 13 of 15
d:\standard ioms - current release\42004 instr. manuals\42004-645l2c.doc
01/04
When the assembly is in an ADVANCE system, faults may be automatically detected, transmitted to the
MCU in data messages, and printed out. Fault messages and possible solutions for their causes are
described in the table below.
Fault Message
Cause and Effect
Possible Solution
Watch-Dog timer
Processor has
Reset
x
d times
(Where
x
is the
decimal number of
times the
watchdog timer
has reset the
processor.)
Cause
—The watchdog timer has forced the
processor to reset. This occurs when the reset
pins (
J4
) on the Base-24 PCBA are temporarily
shorted or when the watchdog timer does not
receive regular status pulses from
U2
on the Base-
24 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. On the fourth and
subsequent resets, the
x
value in the error message
is 0.
•
Verify that the reset pins
(
J4
) on the Base-24
PCBA are not shorted.
•
Replace the Base-24
PCBA.
Stuck Contact on
Polled Device
Paging Pressbar
Depressed
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.
•
Verify that the handset
pressbar is not stuck.
•
Replace the Handset
Amplifier PCBA.
•
Replace the Base-24
PCBA.
Stuck Contact on
Polled Device
Handset Off-hook
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.
•
Verify that the handset is
not off-hook.
•
Replace the Handset
Amplifier PCBA.
•
Replace the Base-24
PCBA.
Supervised Audio
Path
Handset
Cause
—The station failed its internal health
check of the Handset Amplifier PCBA.
Effect
—The station disables the handset amplifier
health-check function after the first failure. This
is a non-restorable fault.
•
Replace the Handset
Amplifier PCBA.
•
Replace the Base-24
PCBA.
Supervised Audio
Path
Page Amp
Cause
—The station failed its internal speaker
amplifier health check.
Effect
—The station disables the speaker amplifier
health-check function after the first failure. This
is a non-restorable fault.
•
Replace the Base-24
PCBA.
