Memphis 16-mcd1000 voltage on output - diyAudio
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Old 24th May 2012, 03:25 PM   #1
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Default Memphis 16-mcd1000 voltage on output

Hello DIYAudio Friends

Now I m checking an memphis 16-mcd1000
All the mosfets appear be fine.
Not visible damage in the amplifier.

The power source is producing + - 55V
The problem is when apply remote, the amplifier drain 1 amp, and after a few seconds, protect-on-protect-on-protect-on....it turn on.
See video:

YouTube - Broadcast Yourself

When is turn on...I put charge in the outputs, the amplifier come into protection mode.


I measure the output terminals and the positive have 55v !!
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Old 24th May 2012, 03:57 PM   #2
timwebb is offline timwebb  United States
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Location: memphis tn
U check the fets in the power supply out of circuit? The 640s fail fast too
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Old 24th May 2012, 06:00 PM   #3
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Pull the audio driver boards. Does the DC go away?
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Old 2nd June 2012, 04:32 PM   #4
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I remove the 2 audio cards and it's the same problem what you see in the video.

the voltages in the TL494cn (with out the audio cards):
1.- 0.00v
2.- 4.8v
3.-0.05v
4.-2.5v
5.-1.4v
6.-3.6v
7.-0.00
8.- 12v
9.- 0.00 changing intermittently to0 .2V
10.-0.00 changing intermittently to0 .2V
11-.12.3v
12.-12.v
13.-4.5v
14.-4.8
15.-4.8v
16.-0.00v

Mosfets are solder but all measure ok.

No visual damage parts or bad solders.

I check the transistors and diode in the relay area, its OK about it. Thanks to Perry and the repair tutorial.
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Old 4th June 2012, 04:07 AM   #5
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Please don't use '-' as a separator. It looks like a negative sign and can be confusing where there could be negative voltage.

Do you still have DC on the tabs of the output transistors?
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Old 4th June 2012, 06:38 PM   #6
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Today the amplifier turn on without protection mode
Click the image to open in full size.
Click the image to open in full size.

Last edited by Solosound; 4th June 2012 at 06:46 PM.
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Old 5th June 2012, 01:46 AM   #7
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Location: Louisiana
Reinstall the audio driver boards and remove the board just behind the RCA jacks. Do you still have 55v on the tabs or is it back to near 0 v?

If you still have 55v on the output, reinstall one audio driver board at a time to see if one or both boards cause 55v to be driven to the tabs of the output transistors.
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