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Old 20th April 2012, 02:07 AM   #1
timwebb is offline timwebb  United States
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Default autotek mm2000.1d

im repairing this amp everything checks out good.the only this is the relays arent turning on.
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Old 20th April 2012, 02:57 AM   #2
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There is a transistor SOT-23 pkg on the P.S. driver card that turns on the relay.
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Old 20th April 2012, 11:24 PM   #3
timwebb is offline timwebb  United States
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the transistors on there check ok. i checked a few out of circuit and they checked fine
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Old 21st April 2012, 09:09 AM   #4
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Did you measure the DC voltage across the relay coil to see if it had 12v?

Did you follow it back to see if there was a break in the trace or some other component in the circuit that's defective?
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Old 22nd April 2012, 09:40 PM   #5
timwebb is offline timwebb  United States
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there is about 1v on the relay coil. i didnt find and broken traces.. all the other traces have glue on them. which transistor on the ps board turns the relays on?
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Old 22nd April 2012, 10:12 PM   #6
timwebb is offline timwebb  United States
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ok there is a faint sound coming from the relay.could it be bad?
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Old 23rd April 2012, 01:34 AM   #7
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The relay will need at least 8-9v to engage.

If there are no other components between the driver board and the relay, use your meter to find continuity between the relay coil pins and the driver board pins. From there trace the circuit on the driver board.
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