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Old 26th December 2009, 06:44 AM   #1
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Default soundstream reference 500sx

amps left channel is putting 20.74 volts on the outputs and - 12.78 on the right channel So i have tons of dc on the outputs but the output transistors are testing fine, Wondering what i should check?
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Old 26th December 2009, 07:03 AM   #2
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What is the DC voltage on the point indicated on the attached photo (for each channel)?
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File Type: jpg IMG_8175bx.jpg (84.4 KB, 81 views)
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Old 26th December 2009, 07:17 AM   #3
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ok i see a problem with this amp before i even get to where u asked for the voltages let me fix something a sec and then ill post the voltages
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Old 31st December 2009, 01:29 AM   #4
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ok back to this amp there were npd7050's for the power supply fets but of course this amp has been worked on before to. Wondering is the irfz44's a good fet for this amp?

I have to rebuild the audio section of this amp so far 2 new driver boards and all new 102's and 107's and all new emitter resistors since have of this stuff was bad when i got the amp
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Old 31st December 2009, 02:21 AM   #5
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I don't have the schematic so I don't know what the original was. It could have been the 7050. The IRF1010E has approximately the same current rating as the 7050. The z44 can't handle as much current as the 7050.
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Old 31st December 2009, 02:49 AM   #6
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Were the ndp7060 the upgrades for the 7050's? i dont have any 1010e's so the only thing i have is the 7060's right now
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Old 31st December 2009, 02:57 AM   #7
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The 7060 is essentially identical. I thought they were obsolete but I see they're still available.
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Old 31st December 2009, 03:30 AM   #8
damage is offline damage  United States
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I used 7060s in my 702.
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Old 31st December 2009, 04:49 AM   #9
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Ok now that i put new fets in , new outputs and emitter resistors in, a new 317 and 337 , and 2 new driver boards, this amp has no sound of the left channel and very low ouput from the right

Wondering where i go from here?
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Old 31st December 2009, 05:00 AM   #10
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The switches are commonly a problem. Move them (all of them) and the pots through their entire range to see if there is any change. Leave the gains at the maximum. Set the crossover to full range. Set the airbass to out.
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