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altec lansing vs 2421 powered computer multimedia speaker

i have a powered speaker box system for computer multimedia application. and it is dead so if you can post the schematic diagram or service manual for the unit i will be very thankful. this is a 2.1 desktop audio system. suitable for desktop computer audio application.

altec lansing
powered audio system
vs2421



altec lansing vs 2421 powered computer multimedia speaker

After a lot of study and trial error I have come to an end.
Inside its remote hand control unit there were two chip one of it was smd type jrc4558 and was the faulty one. along with it I had to change 2 smd transistors too which were inside the subwoofer box unit.

And my system is now booming and I am happy too.

thanks

altec lansing vs 2421 powered computer multimedia speaker

It's been my experience with Altec Lansing that they will not supply schematics for any of their products.

altec lansing vs 2421 powered computer multimedia speaker

check if trafo, rectifiers and elco's are ok

altec lansing vs 2421 powered computer multimedia speaker

Transformer rectifier filter capacitor and supply on the tlo74 and even to the power chip are okay.
Also checked the volume control but all there things are up to the mark.
Please tell me how to n what to check next.
Many many thanks for the help.
Tapan