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Old 12th January 2011, 05:21 PM   #1
stoke is offline stoke  ominican Republic
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Question rockford 501s one bad channel

this amp came with one not working channel but after replaced all the transistor of the bad channel, pulldown resistor and gate driver transistor i get the audio distorted. the opamp look fine, what other things i have to check?
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Old 12th January 2011, 05:21 PM   #2
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Do you have a scope?
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Old 13th January 2011, 12:42 AM   #3
stoke is offline stoke  ominican Republic
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i bought one, but i'm waiting for the shipping delivered it hasn't arrived yet.
Perry, what component you replace in most case to fix the distortion on one channel, knowing that all transistor, gate resistor, pulldown resistor and gate drivers transistors are good?

help me on, to see if i can fix this one before the tektronik arrives
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Old 13th January 2011, 11:07 AM   #4
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There's no specific component that causes distortion. Which output transistors failed? I need the exact circuit board designation.

Did any 0.1 ohm source resistors fail?
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Old 13th January 2011, 06:58 PM   #5
stoke is offline stoke  ominican Republic
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yes found 2 of then with a high value
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Old 13th January 2011, 07:06 PM   #6
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When the source resistors open or read significantly higher than they should, you need to check the low value resistors connected to those source resistors. Specifically which of the source resistors (R...?) failed?
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Old 8th February 2011, 05:11 AM   #7
stoke is offline stoke  ominican Republic
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Finaly i got my scope!!! all the opamps signals look ok the only dif were on gate drivers for audio amp section
this is the measure the same signal on R141 and Q113 gate
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maybe later you can tell me how i can fix my scope back light problem, it's a tektronix tds210 i found on ebay with only this problem i hope could be an easy fix.
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Old 8th February 2011, 05:44 AM   #8
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What does the output look like?

I have no information about that scope but if you ask for information on the tekscopes group at Yahoo. Someone there may be able to help. The group is mainly for vintage scopes but some of the members also repair newer scopes.
TekScopes : All about classic Tektronix CRT o'scopes
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Old 8th February 2011, 04:55 PM   #9
stoke is offline stoke  ominican Republic
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output

Pos
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neg
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Old 8th February 2011, 06:15 PM   #10
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Lift D102 and D104. Does that allow the amp to produce audio?

Be careful when doing this. It will defeat the protection circuit and the amp may draw excessive current.
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