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8 Troubleshooting
8.1 Introduction & Precautions
This section provides a set of procedures for
identifying and correcting problems with the 8500
series amplifier. Rather than providing an exhaus-
tive and detailed list of troubleshooting specifica-
tions, this section aims to provide a set of short-
cuts 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 8500 sesries will un-
dergo frequent engineering updates. As a result,
modules and electronic assemblies may not be
interchangeable between units. Particularly, the
circuit boards undergo periodic engineering modifi-
cations that may make interchangeability between
units impossible.
ELECTRIC SHOCK HAZARD.
Follow these safety precautions before
opening the amplifier's back access
door:
• Disconnect the AC power supply.
• Wait at least 3-5 minutes after
disconnecting AC power before
opening the access door.
• Wear safety goggles.
• Contact AE Techron Technical
Support for any questions or
concerns.
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.
24
WARNING
Information subject to change
8508 OPERATOR'S MANUAL – SECTION 8
3. Wait three to five minutes for the Power Supply
capacitors to discharge.
4. Open the back acess door and check the fol-
lowing:
•
Check to make sure the breaker switch on
all amplifier modules is in the ON position.
I nspect the modules for loose or discon-
•
nected wires or connectors.
Inspect the bus bars connecting the ampli-
•
fier module's outputs for any signs of char-
ring or melting.
Inspect the entire lengths of wires and
•
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) on the
Master amplifier module is set to the Follower
(down) position. This DIP switch should be set
to the Master (up) position. 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
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