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Old 1st January 2013, 01:29 AM   #11
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Pin 2:12.33
Pin 3:6.59
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Old 1st January 2013, 01:48 AM   #12
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I'm using a different amp as a reference (the photos posted weren't of high enough resolution). IC 3 is the IC next to the 494. Pins 1 and 7 are the outputs. If those voltages were from pins 1 and 7, post the DC voltage on all pins of that IC.
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Old 1st January 2013, 01:51 AM   #13
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yes IC3 next to the 494

Pin 1:0.00
Pin 2:12.36
Pin 3:6.60
Pin 4:0.00
Pin 5:11.53
Pin 6:4.96
Pin 7:11.60
Pin 8:13.17
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Old 1st January 2013, 02:12 AM   #14
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If the cathodes of D6 and D7 are directly connected, lift D6. That should disable the protection circuit.
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Old 1st January 2013, 02:21 AM   #15
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With D6 lifted amp powers up and idles perfectly..

I get 51 volts on the right channel measured directly across the speaker terminals
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Old 1st January 2013, 02:27 AM   #16
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There may be multiple problems. With that much DC, the differential amp should be driving the amp to draw current as it tries to eliminate the DC. Since it is not, either the differential amp circuit is damaged, there is a shorted driver or both. There are other possibilities but those are the most likely.
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Old 1st January 2013, 03:02 AM   #17
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So IC 3 may be defective?

Heres what i get when the amp is powerd up on IC3

Pin 1:0.00
Pin 2:12.36
Pin 3:6.60
Pin 4:0
Pin 5:13.16
Pin 6:4.96
Pin 7:11.95
Pin 8:13.16
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Old 1st January 2013, 03:19 AM   #18
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I don't see a problem with IC3. It appears that pin 5 is being driven high by the fault in the defective channel and that was preventing the amp from powering up.
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Old 1st January 2013, 03:23 AM   #19
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Guess i will check everything in that channel since i put new driver ic's in it also all outputs test fine and still same problem
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Old 2nd January 2013, 01:06 AM   #20
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I found that the Drivers (TIP31C and TIP32C) for the outputs have 53 volts on all 3 legs ..

I started removing 1 transistor at a time to get rid of the 51 volts on the legs of the drivers..

i think a few are defective..

anyone know if there are any good subs for theese??

C2229
A970


I have some C2235's on hand wondering would thoose be a good sub for the C2229 or not?

Last edited by S Merlington; 2nd January 2013 at 01:10 AM.
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