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Old 19th April 2012, 11:57 AM   #1
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Location: Texas
Default pioneer gm7200m dead

I have a gm7200m im working on. i dont have power anywhere but the fuses. i checked d665 and no voltage present at all on both leads . The unit is dead. Could someone point me in the right direction. I bought Perrys dvd but havent looked at it very much due to time.
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Old 19th April 2012, 12:53 PM   #2
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If you don't have voltage on the FETs, I'd suspect blown fuses or an open trace.
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Old 9th September 2012, 01:41 AM   #3
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Default measured some voltages on the amp

IC 651 the pioneer 2027A 16 pin ic chip on the power supply


1-13.06vdc 9-16 were 0 exept 15 was .137vdc
2-0
3-13.63vdc
4-0
5-o
6-0
7-0
8-0
13.75vdc on one leg of C677
nothing on either leg of D665
T901 0 on all legs
the thermister on it 0 on both legs
0vdc on L601
r650 had 13.75 on one leg and 11.56on the other
and nothing on the power supply transistors
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Old 9th September 2012, 02:06 AM   #4
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Default picture of the amp

i am posting a picture of the amp
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Old 9th September 2012, 03:00 AM   #5
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If you don't have voltage on either leg of L601, there is a break in the connection between the fuses and L601.
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Old 12th September 2012, 07:49 PM   #6
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i cant believe i didnt see it before. L601 had a bad solder joint. I resoldered it and tested it. Its fixed. Thanks for the help. It was a great learning experience.
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