Autostudio E-80.2 in protection mode, schematic diagram needed. - diyAudio
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Old 31st January 2014, 08:38 AM   #1
diyAudio Member
Join Date: Jan 2014
Default Autostudio E-80.2 in protection mode, schematic diagram needed.

Hey, I know there is old topic already of this problem, but I'm in hurry and I need schematic diagram to fix it.

I already measured diodes and transistors, I didn't find anything unexpected ://

if someone could help, I would be thankful!
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Old 4th February 2014, 05:03 PM   #2
tiomilo is offline tiomilo  Costa Rica
diyAudio Member
Join Date: Apr 2012
Location: Costa Rica (retired)
hi that amp is a classic AB circuit chinese design. step number 1 measure voltage at large capacitors to verify oscillation PSU is ok , should be +-25v if there is no Voltage at all short pin #16 of upc494 or TL494 or whatever oscillation IC family to ground for a second or less, check quickly if there is voltage on rails, or power led should turn on, if that happens focus on thermal circuitry should be faulty some where no so hard to find it out, if not short again pin #16 to ground to override protection and check warming output devices. that will guide you on most AB class amps.
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