Pub. 42004-658L2H
701-902 SmartSeries
®
Handset/Speaker Amplifier
Page 13 of 15
P:\Standard IOMs - Current Release\42004 Instr. Manuals\42004-658L2H.docx
08/19
Problem
Possible Solution
Feedback during page
only
•
Check within the enclosure for a purple wire on terminal 7: this is the
default setting for local speaker mute. If the wire is on terminal 8,
then the speaker is unmuted and may be causing feedback. Reconnect
the wire to terminal 7.
•
An adjacent speaker could be causing feedback. If an adjacent speaker
is the source of the feedback, adjust the orientation of the speaker so
that it is not aimed directly at the station. Enable the mutual muting
function of the station as a last resort. Do this by interconnecting
terminal 7 of the two stations with the spare orange wire in the system
cable (if the wire is available).
Crosstalk
likely to be external to the assembly and related to system cable faults
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
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 (
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.
•
Verify that the reset pins
2 and 3 (
J2
) on the
Handset/FSK/
P PCBA
are not shorted.
•
Replace the
Handset/FSK/
P 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/FSK/
P PCBA.
•
Replace the Speaker
Amplifier/Power Supply
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/FSK/
P PCBA,
or cradle.
•
Replace the Speaker
Amplifier/Power Supply
PCBA.
