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Old 10th April 2003, 04:23 PM   #1
Netlist is offline Netlist  Belgium
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Question Help with Yamaha Pro-Amp

Hi,

Anyone here has experience with or a schematic of a Yamaha PC1002 PA amp?
At switching on, the amp goes immediately in protection.
Output transistors ok. Bridge rectifier ok, voltage remains long enough at PSU-caps. No resistors burned.

/Hugo
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Old 10th April 2003, 05:37 PM   #2
OliverD is offline OliverD  Germany
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Have you checked the amp's output before the speaker relay? If there is not too big an offset, probably something is wrong with the protection circuit itself.

Sorry, no schematic, but I don't think you really need one to fix an amp.
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Old 10th April 2003, 07:58 PM   #3
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Thanks for the reply.
The amp shuts off immediately, so it's not possible to measure anything. Basically, a schematic would be handy to debug the protection circuit or to find out if and where it could be disabled. (Saves a lot of time).

/Hugo will debug it anyway.
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Old 11th April 2003, 08:30 AM   #4
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The mains switch was broken.
Thanks for the help

/Hugo
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