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Old 3rd August 2007, 02:17 PM   #1
diyAudio Member
Join Date: Sep 2006
Default ads pq20

im working on an older amp ads pq20 the amp does nothing i checked all diodes transistors and resistors in the power supply all check fine so im thinking it might be the op amp mn3102 wondering if anyone knows a good cross for that part number a more common used one and what else i might check out if thats not the cause of the problem thanks in advance
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Old 3rd August 2007, 08:06 PM   #2
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Join Date: Nov 2003
Location: Louisiana
Generally if the amp does nothing, the best place to begin troubleshooting is the power supply driver IC. Post a list of the voltages on the pins of the IC.
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Old 5th August 2007, 09:42 PM   #3
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Join Date: Dec 2005
Location: Northern California
The mn3102 is a integral pert of this very old school transistor power supply design. The chip was also used in very early kenwood amps, by early I mean the one ones with yellow and black cables coming out of the endplates and thats before the 820 & 920 & 1020 models numbers back in the late 80's < very old >

The part might be available from Kenwood still but I would doubt it, and ADS is now owned by Directed so not much hope there either. The ADS PH-15 has the same part in it also.

The mn3102 is a odd IC and was only used on these two brands of amps that I can remember < its been a long time>.

I see you posted that the board was baked badly Shame the amp was not better cared for. Perhaps someone can help you with the schematic with that you can at least see what the mn3102 does for this supply, as it is a most important part and the supply will not function with out it.

Good luck
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Old 8th August 2007, 01:11 AM   #4
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Join Date: Jan 2006
Location: Central Ohio
Is this the same chip?
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