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Pioneer GM-D8601
Pioneer GM-D8601
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Old 14th March 2019, 04:11 PM   #1
caraudioguy2100 is offline caraudioguy2100
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Default Pioneer GM-D8601

Amp had a blown power supply and blown outputs .

I replaced the power supply fets and the outputs .

I get + - 15 volts on the opamps and - + 49 volts of rail .


With the gain turned all the way up I get very low output .

Any ideas on where to start looking ?
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Old 14th March 2019, 05:13 PM   #2
jkrokenberger is offline jkrokenberger  United States
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Mute circuit may be stuck on from a failed small component or the protection circuit is seeing a fault.
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Old 14th March 2019, 06:05 PM   #3
Perry Babin is offline Perry Babin  United States
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Do you have rail-rail oscillation on the output FETs?
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Old 14th March 2019, 08:49 PM   #4
caraudioguy2100 is offline caraudioguy2100
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Yes I get rail to rail oscillation on the outputs
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Old 14th March 2019, 09:14 PM   #5
Perry Babin is offline Perry Babin  United States
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Have you checked all switches and pots to make sure that none are intermittent?

Post a photo of the area including the output driver IC.
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Old 14th March 2019, 11:15 PM   #6
caraudioguy2100 is offline caraudioguy2100
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Yes I moved all pots and still same thing very low output .

Hereís is a pic of the area around the driver IC

Is there a way to test these like the ir21844s ?
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Old 15th March 2019, 01:29 AM   #7
Perry Babin is offline Perry Babin  United States
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Did you have another post on this amp? That photo looks familiar.

The Elektrotanya | This site helps you to save the Earth from electronic waste! site has the D9605 service manual.. The sub channel appears to be similar. There is a flow-chart that tells you some things to check for. The 500 series parts are what you want to be concerned with.

I think the IC is likely OK but I don't have a test amp that uses the IRS2092S (wrongly referred to as the IRS2902S in the pioneer SM).

If you have the tutorial, IRAUDAMP5, 7D and 9 in the semiconductor datasheets folder have basic information on this IC. If you don't have the tutorial, they are available online.
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Old 15th March 2019, 01:38 AM   #8
caraudioguy2100 is offline caraudioguy2100
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I didnít have another post on this amp I just got it in today . And I took
That photo right before i posted
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Old 15th March 2019, 01:43 AM   #9
Perry Babin is offline Perry Babin  United States
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This was the post I was thinking of:
GM9601 pioneer
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