Pub. 42004-610L2A
Model 751-801 SmartSeries
®
Speaker Amplifier
Page: 7 of 12
\\s_eng\gtcproddocs\standard ioms - current release\42004 instr. manuals\42004-610l2a.doc
03/04
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
number of times the
watchdog timer has
reset the processor.)
Cause
—The watchdog timer has forced the
processor to reset. This occurs when the Base-16
PCBA reset pins (
J4
) are temporarily shorted or
when the watchdog timer does not receive
regular status pulses from
U2
on the Base-16
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 4th reset the
x
value in the error message resets to 0.
•
Verify that the reset
pins (
J4
) on the Base-
16 PCBA are not
shorted.
•
Replace the Base-16
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-16 PCBA.
Supervised Audio
Path
Speaker Voice Coil
Cause
—Station isn’t detecting ambient noise at
the speaker or ambient noise is lower than the
configured failure threshold. This can occur if
there is a fault in the speaker wire or a fault at the
voice coil. This also can occur if the ambient
noise at the speaker is low, as 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.
•
Verify the speaker wire
is connected and intact.
•
Verify the voice coil is
connected and intact.
•
Verify the Offset Level
adjustment is set
correctly.
•
Replace the Base-16
PCBA.
Polled device
Cause
—This message is output by the MCU
when communication is lost with the station.
This can occur if there is a fault in the page line,
if the station is powered-down, or if there is a
fatal malfunction within the station.
Effect
—The MCU continues to attempt
communication with the station. A restore
message is output when communications resume.
•
Verify the page line is
connected and intact.
•
Verify the station is
installed correctly.
•
Replace the Base-16
PCBA.
Polled end-of-line
device
Cause
—This message is the same as the “Polled
device” fault, except that the affected station has
been defined as an end-of-line station in the
MCU configuration.
Effect
—When this fault occurs, the red
EOL
FLT
LED on the PPI bezel lights. The LED
extinguishes and a restore message is output
when communication with the station is resumed.
•
Verify that the page line
is connected and intact.
•
Verify that the station is
installed correctly.
•
Replace the station
assembly.
