pioneer gm7200m dead

eroc1313 · 19th April 2012, 10:57 AM

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.

Perry Babin · 19th April 2012, 11:53 AM

If you don't have voltage on the FETs, I'd suspect blown fuses or an open trace.

eroc1313 · 9th September 2012, 12:41 AM

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

eroc1313 · 9th September 2012, 01:06 AM

i am posting a picture of the amp

Perry Babin · 9th September 2012, 02:00 AM

If you don't have voltage on either leg of L601, there is a break in the connection between the fuses and L601.

eroc1313 · 12th September 2012, 06:49 PM

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.

19th April 2012, 10:57 AM	#1
eroc1313 diyAudio Member Join Date: Jul 2009 Location: Texas	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.

19th April 2012, 11:53 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If you don't have voltage on the FETs, I'd suspect blown fuses or an open trace. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

9th September 2012, 12:41 AM	#3
eroc1313 diyAudio Member Join Date: Jul 2009 Location: Texas	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

9th September 2012, 02:00 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If you don't have voltage on either leg of L601, there is a break in the connection between the fuses and L601. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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12th September 2012, 06:49 PM	#6
eroc1313 diyAudio Member Join Date: Jul 2009 Location: Texas	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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