Information subject to change
97-8004167 07-14-17
7224 & 7226 OPERATOR’S MANUAL –
SECTION 9
40
9
Troubleshooting
9.1 Introduction & Precautions
This section provides a set of procedures for iden-
tifying and correcting problems with the 7224/7226
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 7224 and 7226 amplifiers
will undergo 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.
9.2 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
Breaker/Switch to the Off (O) position.
2.
Disconnect the AC mains plug from the
amplifier.
3.
Wait three to five minutes for the Power Sup
-
ply capacitors to discharge. You can verify the
capacitor discharge by connecting a voltmeter
Vcc and –Vcc test points on the main
board (see
Figure 9.1
). Verify a reading of less
than 50 volts before proceeding.
4.
Inspect the amplifier’s internal components.
Check the following:
•
Inspect modules for charring, breaks, deforma
-
tion 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.
If there is any physical damage to the amplifier,
please return it to AE Techron or an AE Techron
Service Center for repair.
Figure 9.1 – +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
