TECH TIPS
Troubleshooting tips and solutions to common service problems
For models: HTS-10,* HTS-20,* BU80E (See Note below) TIP# INFTT2001-03
Subject:
Disassembly instructions for power amp module CN1/CN101:
Synopsis:
The entire heatsink/shield assembly on the power amp module is attached with two screws, and will slide off
the PCB, exposing the components.
Instructions:
1) Unplug all external cables from the subwoofer; place the cabinet on a padded surface.
2) Remove all Phillips screws holding the amplifier to the cabinet; remove the amplifier.
3) Detach the plug connecting the amplifier to the woofer.
4) Remove the two large Phillips screws, with nuts & washers, holding the metal transformer shield in place;
remove the shield.
5) At the bottom of the main PCB locate the two Phillips screws holding the heatsink/shield assembly to the
main PCB; remove them.
6) If required, with the addition of a screwdriver blade or similar tool, carefully pry the heatsink away from the
main PCB, working both sides evenly. Pull it straight off the PCB (it?s in a slot in the heatsink).
Replacement:
Follow instructions above in reverse order.
WARNING: If Q2 or Q3 are replaced, care must be taken to duplicate original Q2/Q3 position on the PCB
(mated flat on the board, complete with thermal sleeves and silicon grease). If this is not observed, the parts
may be dislodged, damaged, or may fail when the heatsink is replaced and the amplifier is powered up.
* Instructions are only valid for late versions of the HTS-10 and HTS-20 that have the words ?Made in China?
on the faceplate. For versions with ?Made in Canada? on the faceplate, the power amp module, if defective,
must be replaced in its entirety, part# 60301, following the instructions in the service manual..
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ACEC
