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Old 28th August 2011, 09:43 PM   #21
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Have you tried installing the outputs?

There may be no problem.
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Old 28th August 2011, 09:50 PM   #22
timwebb is offline timwebb  United States
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i tried it.one group of 640's get hot and it has dc current on the speaker terminals. i pulled the driver cards out it does the same thing.
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Old 28th August 2011, 09:59 PM   #23
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Are they new transistors?
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Old 28th August 2011, 10:02 PM   #24
timwebb is offline timwebb  United States
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yeah i just got them in.
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Old 28th August 2011, 10:23 PM   #25
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How much DC voltage is there on the tabs of the output transistors (no driver board in the circuit)?
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Old 28th August 2011, 10:24 PM   #26
timwebb is offline timwebb  United States
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on the card behind the opamps the two pins labeled output and sync has that same signal as before.
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Old 28th August 2011, 10:31 PM   #27
timwebb is offline timwebb  United States
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12.3 volts
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Old 28th August 2011, 10:36 PM   #28
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With the black probe on the amp ground, what is the DC voltage on the secondary center tap of the power transformer?
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Old 28th August 2011, 10:42 PM   #29
timwebb is offline timwebb  United States
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12.5v
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Old 28th August 2011, 10:46 PM   #30
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Measure the resistance between the B+ terminal and the secondary center tap with no power applied. What's the resistance?
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