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Old 21st March 2012, 07:19 AM   #1
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Default marantz pm66se no lights

My pm66 shows no lights on the facia when switched on. The heatsinks and output transistors all get warm, and the source direct relay clicks when the button is pressed but the output relay doesn't click into life as it should.
I have replaced the suspect r807 47r which was faulty, tested all the other resistors I can see [I think!] And replaced the 2 big main caps with 12000uf 63wv ones, but still no lights or relay click.
Can anyone give me any help or advise as to what it could be? Thanks.
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Old 21st March 2012, 09:01 AM   #2
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Burnt out bulbs?
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Old 21st March 2012, 09:39 AM   #3
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you need to verify that all voltage is present according to the schematic where highlights will be he secondary power supply that is located on board P851 there is a regulator there and a transistor circuit for 5 and 24 volt

then you need o verify voltage on board PU01 ( front board) check also LU01 and so on

carefully though it can be complicated
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Old 12th April 2012, 09:08 PM   #4
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still no lights or relay click. When I switch it on the transformer makes a louder than usual humming noise. It sounds like something is putting a drain on it. The fuse will blow eventually, but not immediately. Only kept it on 5 secs incase it is doing futher.damage. Any advice appreciated. Thanks.
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Old 12th April 2012, 09:40 PM   #5
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Sounds like is some serious current flowing, which is never a good sign. Next thing to do would be fashioning a bulb tester and checking voltage and current levels in both channels of the power amp.
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