96-8005353_02-17-2022
Information subject to change
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8504 OPERATOR’S MANUAL – SECTION 8
3.
Undesired DC offset at the Output and Input signal.
If the amplifier chronically overheats with suitable
power/load conditions, then the amplifier may not
be receiving adequate airflow. To check for ad
-
equate airflow, proceed with the following steps:
8.6.2
Check for Inadequate Airflow
1.
Check air filters. Over time they can become
dirty and worn out. It is a good idea to clean
the air filters periodically with a mild detergent
and water.
2.
Visually inspect fans to assure correct opera
-
tion while amplifier is On (I). Any inoperative,
visibly slow, or reverse-spinning fan should
be replaced. Please see the Factory Service
information at the end of this section.
An OverTemp condition places the amplifier in
Standby mode. If the OverTemp pulse is ex
-
tremely short, as in the case of defective wiring or
switches, the OverTemp pulse may be too brief to
observe.
8.6.3 Resetting After OverTemp
To reset the amplifier after an OverTemp has oc
-
curred, make sure fans are running. Remove the
input signal from the amplifier and allow the fans
to run until the amplifier has cooled sufficiently and
the amplifier automatically returns to Run mode.
NOTE:
Typically, overheating that occurs in the
amplifier outputs due to inadequate airflow or very
low impedance loads will clear within 5 minutes.
Overheating in the amplifier transformers due to
excessive power requirements will take from 5 to
15 minutes to clear. Timing the cool-down period
for the amplifier may help to determine the cause
of the overheating.
If the fault condition does not clear, return the am-
plifier for Factory Service.
8.7 Fault LED is Illuminated
The 8504 contains protection circuitry that disables
the amplifier if an output stage is behaving abnor
-
mally. This usually indicates an output transistor
has shorted.
To clear the Fault condition, follow these steps:
1.
Turn off the signal source.
2.
Turn off the AC mains.
3.
Turn AC mains power back on. If the Fault LED
doesn’t illuminate again, press the Standby-
Run switch to place the amplifier in Run mode
and turn the signal source on.
4.
If the Fault LED is still illuminated and the Fault
condition doesn’t clear, return the amplifier for
Factory Service. See the Factory Service infor-
mation at the end of this section.
Shut off the signal source before reset-
ting the amplifier. Try resetting the Fault
condition only once. If the Fault condi
-
tion does not clear after one reset, STOP.
Contact AE Techron Support for further
assistance. Repeated resetting can dam
-
age the amplifier.
CAUTION
8.8 Factory Service
If the troubleshooting procedures are unsuccess
-
ful, the amplifier may need to be returned for
Factory Service. All units under warranty will be
serviced free of charge (customer is responsible
for one-way shipping charges as well as any cus
-
tom fees, duties, and/or taxes). Please review the
Warranty at the beginning of this manual for more
information.
All service units must be given Return Authoriza
-
tion by AE Techron, Inc. before being returned.
Return Authorizations can be requested on our
website or by contacting our Customer Service
Department.
Please take extra care when packaging your am
-
plifier for repair. It should be returned in its original
packaging or a suitable alternative. Replacement
packaging materials can be purchased for a nomi
-
nal fee.
Please send all service units to the following ad
-
dress and be sure to include your Return Authori
-
zation Number on the box.
AE Techron, Inc.
Attn: Service Department / RMA#
2507 Warren Street
Elkhart, IN 46516
