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HELP! Laney BC75 Combo Schematic?

Aug 11, 2009
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3,800
OK, I did a real prize-winning stupidity! I just bought two Carvin BX500 bass heads and was testing them out. Just for quick and dirty I was using the speaker in my Laney Combo.

Well, I wasn't paying attention (always the start of expensive trouble, right?) and I plugged the Carvin into Laney AMP and not the speaker. Well, no question who was the winner of the Laney vs Carvin battle.

Laney combo is DOA. I knew I was in trouble when I was trying to get a sound out of it and the POWER led on the Laney was flashing! Well it blew the fuses and when fuses were replaced it just does a loud hum. So far I've tested the output transistors, the output driver transistors and the power supply filter caps (and of course the fuses of which one was blown). But problem remains.

I can see this is going to take some deeper digging. So I went to Laney website looking for a schematic. They seem to have them, but you have to request them. So I sent an email (which they warned you they might just ignore) and so far they've ignored it. The schematic was listed on a number of schematic sites, but for some reason (Pressure from Laney?) they've all been "withdrawn"! This is not good.

So I'm wondering if ANYONE here happens to have this schematic diagram stored away in your computer files?

If so I'm desperate for a copy! Thanks!

Not sure if this is "electronics" or "amps", but I thought I try here first.
 

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