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Old 17th April 2010, 02:12 AM   #1
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Default Sony XM-D1000P5

I recieved this amp in for repair. I replaced all power supply fets and gate resistors. Also replaced some of the outputs so far. If i have all 8 outputs
(SSP45N20's) in the amp it will draw excessive current. If i take 4 of them out for the left channel amp powers up and play's fine. I checked to see if the outputs were shorted or leaking and even replaced them with different ones.

So wondering where i go from this point since i cant seem to find the problem ? If all 8 outputs are in the amp it draws excessive current
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Old 17th April 2010, 02:19 AM   #2
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This is a mono amp (only one channel).

Were the replacement outputs SSP45N20As?
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Old 17th April 2010, 02:19 AM   #3
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yes ssp45n20a's
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Old 17th April 2010, 02:32 AM   #4
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From my experience, I've found that the only transistors that work (properly) with these amp are the original outputs. I've tried a few other parts (including the 45N20B) and was not successful in finding a viable substitute. I've purchased NOS 45N20As and they didn't work either. I've taken outputs out of a working amp and installed them in the amp I was having trouble with and the original outputs worked. I did this simply to confirm that there was no other problem with the amp. There may be outputs that will work in this amp but I haven't found them.

Where did you purchase the output from?
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Old 17th April 2010, 02:36 AM   #5
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I took them out of a different sony amp that was working 100% (same model)

There was only 2 outputs that were shorted in the amp im repairing So i took the 2 shorted ones out and tryed powering it up and it draws excessive current with 6 out of the 8 outputs in it. Amp works fine with 4 out of the 8 outputs in it
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Old 17th April 2010, 02:47 AM   #6
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It would seem that one or more of the outputs are leaking. With your meter set to ohms, do you read OL when the resistance is measured from the gate led to the other legs (FETs out of the sink)?

When you say it works fine, do you mean it's not drawing excessive current or do you mean that it's producing clean audio to full power (or at least to clipping)?
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Old 17th April 2010, 02:48 AM   #7
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Ok with only 4 outputs in the amp I put my meter leads on the outputs . I get 28.69 volts on the outputs for a split second upon power up the it will slowly go down to 0 volts. Wondering what could cause this? With only 4 outputs in it it produces clen output and doesnt draw excessive current. The amp i took the outputs from was working 100% flawless. So i have 4 old outputs in the amp im repairing and trying to put 4 in from a differnt amp to see if i have any other problems with the amp

Last edited by mike49504; 17th April 2010 at 02:50 AM.
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Old 17th April 2010, 02:52 AM   #8
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What is the circuit board designations for the 4 transistors you have in the circuit?

Did you check for leakage on the outputs that were out of the other amp?
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Old 17th April 2010, 03:01 AM   #9
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Ok found 2 out of the 4 outputs i do have in the amp to be leaking so im gonna replace them and see if i can get this amp up and running
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Old 17th April 2010, 04:36 AM   #10
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with outputs Fet 17,18,19,20 in the amp it powers up and produces clean output. If i try putting the other 4 in the amp 1 at a time amp will draw excessive current. I have outputs from another amp and they all test fine but when i try to put more then 4 in this amp it draws excessive current.

Wondering where i should go from here?
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