QSC PowerLight Series Technical & Service Manual page 12

Figure 2.4. Removing or installing the
chassis rear panel.
20. Remove the chassis rear panel from the main chassis.
21. Cut and remove the tie wraps that secure the output wires to
the rear panel.
Removing the audio modules
22. There is a ground screw at the back of each audio module
(see Figure 2.4). Remove it.
23. Slide the audio module toward the front of the chassis so that
its keyed mounting holes are clear of the standoffs.
24. Lift up the back of the audio module slightly, then lift the
entire module clear of the chassis.
Removing the power supply modules
25. If you need to remove one or both power supply modules, you
will need to remove both audio modules. Invert one audio
module and set it on top of the other channel's audio module,
then set them aside.
26. Straighten the five power supply wires on each channel.
27. Remove the three screws from the front of the chassis
partition.
28. Remove the side-facing screw from the front of the partition
on channel 1's side.
10
Locations of
ground screws
for audio modules
Key QSC Part Description
1 CH-000078-00 Chassis, PL 9.0
2 WP-000172-00 Rear chassis assembly
3 SC-082051-PL Screw, #8 × 5/16", pan head
4 SC-080051-PU Screw, #8-32 × 5/16", flat head
5 SC-082051-PL Screw, #8 × 5/16", pan head
29. Remove two black pan head screws from the center line of
the chassis partition.
30. Slide the chassis partition back, then lift up on the channel 2
side of it. Press down on the back of the partition, then lift it
clear of the chassis.
31. Remove the two screws at the front of the power supply
module.
32. Use a 5/64" hex (Allen) key to remove the screw at the rear of
the power supply module.
33. Use an 11/32" nutdriver or socket wrench to remove the two
nuts on the AC connection (a white and a black wire).
34. Slide the power supply module toward the rear of the chassis,
then lift it up and out of the amplifier.
Inspecting the power supply modules
35. Visually inspect the power supply module. Check the leads of
diodes D1 and D12, because they sometimes crack due to
flexing of the circuit board.
36. Using isopropyl alcohol and a brush, clean any dirty or charred
parts of the circuit board. Look for burned-off circuit board
traces, especially around the switching MOSFETs; missing or
damaged ones can be repaired using a trace repair kit. If the
Qty.
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QSC Audio Products, Inc.
TD-000083-00