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Pioneer GM7300M
Pioneer GM7300M
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Old 7th February 2012, 10:24 PM   #1
mike49504 is offline mike49504  United States
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Default Pioneer GM7300M

Amp powers up and produces + - rail voltages and + - 15 volts of regulated voltage..

I cleaned the Switch But still no output..


Any ideas?
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Old 7th February 2012, 11:30 PM   #2
Perry Babin is offline Perry Babin  United States
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Do you have audio on pins 1 and 7 of IC191?
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Old 8th February 2012, 03:45 AM   #3
mike49504 is offline mike49504  United States
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No
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Old 8th February 2012, 04:56 AM   #4
Perry Babin is offline Perry Babin  United States
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List the op-amps that do have audio on pins 1 and 7.
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Old 8th February 2012, 05:08 AM   #5
mike49504 is offline mike49504  United States
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I only get audio on Pin 1 of IC112


All other op-amps i get nothing on pins 1 and 7
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Old 8th February 2012, 05:22 AM   #6
Perry Babin is offline Perry Babin  United States
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Do you have audio on both legs of R111 and R112?
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Old 8th February 2012, 05:25 AM   #7
mike49504 is offline mike49504  United States
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I didnt notice it til now theres a crack in the board and atleast 5 traces are not making contact..


I will repair all traces and the get back to you..
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Old 8th February 2012, 05:43 AM   #8
mike49504 is offline mike49504  United States
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Ok I have Audio On the following IC's


IC111 Audio on pins 1 and 7

IC112 Audio on pin 1 only

All other op-amps no audio..


R111 audio on both sides

R112 Audio on both sides
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Old 8th February 2012, 07:18 AM   #9
Perry Babin is offline Perry Babin  United States
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Look for another break between pin 1, R133 and pin 5.
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Old 8th February 2012, 08:00 AM   #10
mike49504 is offline mike49504  United States
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Do you have a pic of that area around R133 ?


The board is cracked and i cant locate R133
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