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QSC Audio Products, LLC
7.2 PSU/amplifier board
Removal
1. Remove the faceplate assembly to gain access to the PSU/amplifier PCB. Follow removal instructions in “7.1 Faceplate”
on page 23.
2. Remove all screws that secure the PSU/amplifier PCB to the bucket chassis.
3. Remove the rectangular plate and nylon spring seat.
4. Gently lift the PSU/amplifier PCB out of the bucket.
Installation
1. Prepare the PSU/amplifier PCB for installation. Apply new thermal grease to the large MOSFETs and thermal sensor
mounted to the bottom-side of the PCB.
2. Verify that the thermal pads are clean and placed in their appropriate locations on the bottom of the bucket chassis.
Warning: Thermal pads are also used to isolate the body of the MOSFETs from the bucket chassis (ground). If there is
any part of the MOSFET grounded to the chassis, the BOP won’t power on or output audio.
3. Place the PSU/amplifier PCB in the bucket chassis and align the mounting holes.
4. Set the nylon spring seat and the rectangular plates.
5. Beginning with the corner screws, fasten all short screws to secure the PCB to the chassis.
6. Fasten the two long screws last. This will press the MOSFETs against the chassis for good heat transfer.
Figure 7.3 - PSU/amplifier PCB removal from the bucket chassis.
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