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Old 9th June 2014, 01:09 PM   #1
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Default soundstream ref200 S repair

I'm trying to fix this broken SSref200 S

Q21 and Q22 were shorted so I replaced them with IRFz44's, I read in another thread that they were suitable replacements.

On powering up the amp keeps blowing the internal fuse, I used a 10 amp

D15 and D16 were now testing as failed so I pulled them, I tested them again - off the board and they appear to be fine?

So, I have two questions

I will be replacing D15 and D16 with new components, can anyone tell me the correct order ie is D16 FEP16CT or FEN16CT?

Also why is the amp blowing fuses?

I tested the IRFZ44's and they are fine?

I also tested all the outputs and they are all good

Tested the FEB boards and they are also fine

Thanks in advance
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Old 9th June 2014, 01:15 PM   #2
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D4 looks like it has been replaced at some stage, does anyone know the correct value, I will replace it for good measure as it's failing diode test
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Old 9th June 2014, 01:17 PM   #3
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Did you test the drivers before installing the FETs?

If you're looking for subs:
FEP16CT = MUR1620CT
FEN16CT = MUR1620CTR

FEN = D16

If you have a current limiter, power it up through the limiter (all PS transistors clamped and the rectifiers out of the board) and twist the transformer to see if the current draw changes.
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Old 9th June 2014, 01:18 PM   #4
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1N5402. If that diode is shorted, it would draw excessive current with no remote voltage applied.

Email me if you want the diagram,
babin_perry@yahoo.com
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Old 9th June 2014, 01:19 PM   #5
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Thanks Perry,

where are the drivers located?
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Old 9th June 2014, 01:24 PM   #6
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[IMG]Click the image to open in full size.[/IMG]
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Old 9th June 2014, 01:30 PM   #7
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IN5402 tested fine so I soldered it back in
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Old 9th June 2014, 02:04 PM   #8
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I tested it with a current limiter and nothing overheats, The yellow protect light is on,

There is no audio.

Also the screw that clamps the board next to the high current switch has a plastic insulating washer, I've never seen these on SS amps?
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Old 9th June 2014, 02:20 PM   #9
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Apologies- yellow fault light - not protect light
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Old 9th June 2014, 02:22 PM   #10
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Also found the insulator washer was in the wrong place, google images suggest the plastic washer screw is the one that clamps q21 and q22
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