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8 Troubleshooting
8.1 Introduction & Precautions
This section provides a set of procedures for
identifying and correcting problems with the 8504
amplifier. Rather than providing an exhaustive and
detailed list of troubleshooting specifications, this
section aims to provide a set of shortcuts intended
to get an inoperative amplifier back in service as
quickly as possible.
The procedures outlined in this section are direct-
ed toward an experienced electronic technician;
it assumes that the technician has knowledge of
typical electronic repair and test procedures.
Please be aware that the 8504 will undergo fre-
quent engineering updates. As a result, modules
and electronic assemblies may not be interchange-
able between units. Particularly, the circuit boards
undergo periodic engineering modifications that
may make interchangeability between units impos-
sible.
Uninsulated terminals with AC Mains
potential are exposed when the cover is
removed. Do not proceed until AC Mains
have been disconnected.
8.2 Visual Inspection
Before attempting to troubleshoot the amplifier
while it is operating, please take time to complete
a visual inspection of the internal components of
the amplifier.
1. To perform a Visual Inspection, first turn the
Power switch to the Off (O) position.
2. Disconnect the AC mains from the amplifier.
3. Wait three to five minutes for the Power Supply
capacitors to discharge.
4. Remove the cover and Inspect the amplifier's
internal components. Check the following:
I nspect modules for charring, breaks, defor-
•
mation or other signs of physical damage.
Look for any foreign objects lodged inside
•
the unit.
30
DANGER
Information subject to change
8504 OPERATOR'S MANUAL – SECTION 8
Inspect the entire lengths of wires and
•
ribbon cables for breaks or other physical
damage.
5. If there is any physical damage to the amplifier,
please return it to AE Techron for repair.
8.3 No Signal
Missing Output signal may be caused by one of
the following:
1. The Control Configuration DIP switch (#7) is set
to the Follower (down) position. The amplifier
should only be configured for Follower operation
if it is in a multi-amplifier system; otherwise this
DIP switch should be set to the Master (up) posi-
tion. See the Advanced Configuration section
in this manual for more information.
2. A signal source is not connected to either in-
puts on the amplifier. See the Amplifier Setup
section in this manual for more information.
8.4 No LEDs Illuminated
If none of the LEDs on the Display Panel are il-
luminated, check the following:
1. The AC mains are not connected or not on
(see the Amplifier Setup section for more
information).
8.5 Over/Under Line LED Lit
The amplifier will protect itself from AC mains volt-
age that is 10% above or below the voltage indi-
cated on the back panel. If the AC mains voltage is
more than 10% outside the range of the operating
voltage, increase or reduce the AC mains voltage
to the proper level. When the line voltage condition
is corrected, the amplifier will automatically return
to Run mode. If the amplifier does not reset, the
amplifier's internal transformers may need to be
replaced. Please see the Factory Service infor-
mation at the end of this section.
8.6 Run/Standby LED Remains Amber
When the Run/Standby LED is lit solid amber, the
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