Information subject to change
97-7796264_09-04-2020
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 7
32
7
Troubleshooting
7.1 Introduction & Precautions
This section provides a set of procedures for
identifying and correcting problems with the
7548/7794/7796/7796HC 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 these amplifiers may un
-
dergo frequent engineering updates. As a result,
modules and electronic assemblies may not be
interchangeable between units. Particularly, the
Main board undergoes periodic engineering modifi
-
cations that may make interchangeability between
units impossible.
7.2 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 OFF
the power at the rear circuit breaker.
2.
Disconnect the AC mains plug from the ampli
-
fier.
3.
Wait three to five minutes for the Power Supply
capacitors to discharge.
4.
Remove the 16 single screws from the top
cover.
5.
You can verify the capacitor discharge by con
-
necting a voltmeter Vcc and –Vcc test
points on the main board (see
Figure 7.1
).
Verify a reading of less than 5 volts before
proceeding.
6.
Inspect the amplifier’s internal components
(see
Figure 7.2
). Check the following:
•
Inspect modules for charring, breaks, defor
-
mation or other signs of physical damage.
•
Look for any foreign objects lodged inside
the unit.
•
Inspect the entire lengths of wires and ribbon
cables for breaks or other physical damage.
7.
If there is any physical damage to the amplifier,
please return it to AE Techron for repair.
Figure 7.1 – +Vcc and –Vcc Point Locations
Uninsulated terminals with AC Mains
potential are exposed when the panel is
removed. Do not proceed until AC Mains
have been disconnected.
DANGER
Figure 7.2 – Amplifier cover removed for inspection
Summary of Contents for 7548
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