GAI-Tronics 751-905 Smart SERIES Handbuch - Seite 10

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751-905 SmartSeries
Speaker Amplifier

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.)
Supervised Audio
Path
Page Amp
Supervised Audio
Path
Speaker Voice Coil
f:\standard ioms - current release\42004 instr. manuals\42004-686l2d.doc
03/12
Cause and Effect
Cause—The watchdog timer has forced the
processor to reset. This occurs when the reset
pins (J2) on the FSK/P PCBA are temporarily
shorted or when the watchdog timer does not
receive regular status pulses from U4 on the
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 failed its internal speaker
amplifier health check.
Effect—The station disables the speaker
amplifier health-check function after the first
failure.
Cause—The station is detecting no ambient
noise at the speaker or is detecting an ambient
noise lower than the configured failure
threshold. This may occur if there is a fault in
the speaker wire or a fault at the voice coil.
This also may occur if the ambient noise at the
speaker is too low, as is the case in a quiet
room.
Effect—The station continues measuring
speaker ambient noise. When acceptable noise
levels are subsequently measured, a restore
message is sent to the MCU.
Pub. 42004-686L2D
9 of 11
P
AGE
Possible Solution
Verify that the reset
pins 2 and 3 (J2) on the
FSK/P PCBA are not
shorted.
Replace the FSK/P
PCBA.
Replace the Speaker
Amp/Power Supply
PCBA.
Replace FSK/P PCBA
Verify that the speaker
wire is connected and
intact.
Verify that the voice
coil is connected and
intact.
Replace the Speaker
Amp/Power Supply
PCBA.
Replace FSK/P
PCBA.