Bose Speaker AMP Service 01
by
, 21-04-2011 at 11:11 PM (6094 Views)
Managed to finish the service on the CCU board and sent out the Final report to the owner.
Now, it’s time to work on the Bose Speaker AMPs.
Bose modified the AMP board design around mid 90’s but still, the spec of electrolytic capacitors were not upgraded and thus, sooner or later, they will start leaking the acid.
There was no major leakage so decided to check the gain control first on the bench.
Removed capacitors from all three AMPs and in the process of cleaning both surface.
Checked any damages to the track and pad and installed the upgraded capacitors.
In order to get max heat sink effect, applied thermal compound on both side of FET.
The circuit board itself is acting as the heat sink addition to the obvious heat sink at the silver metal cover.
Quick check and applied comformal coating on both side.
Passenger foot well AMP is done.
Time to test it on the bench with MP3 player and actual Bose speaker for at least 2 hours.
Working on the two remaining Front door AMPs now.
Kaz