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Old 2nd January 2013, 01:10 AM   #21
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Location: Louisiana
That would tend to indicate that you have no negative rail voltage on those drivers.
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Old 2nd January 2013, 01:15 AM   #22
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If i remove the TIP31C and TIP 32C and the A970 and C2229 heres what i get on the pads for the drivers..


TIP31C

Leg 1:-0.21
Leg 2:52.9
Leg 3:0.00

TIP32C
Leg 1:-0.21
Leg 2:-53.3
Leg 3:0.00

If i re-install the C2229 i get the 53 volts on all 3 legs back..

Is there a good sub for thoose ??

I have some C2235's on hand would thoose be a good replacement or no?
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Old 2nd January 2013, 01:23 AM   #23
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On the working channel, do you read 0 ohms between the center legs of the outputs and the adjacent drivers?
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Old 2nd January 2013, 01:27 AM   #24
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Yes i read 0.2 ohms
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Old 2nd January 2013, 01:28 AM   #25
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Check the dead channel the same way.
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Old 2nd January 2013, 01:29 AM   #26
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I get 0.2 ohms on thoose as well
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Old 2nd January 2013, 01:40 AM   #27
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Look for a bad solder connection on the PNP output transistor. It may be a jumper feeding the outputs.
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Old 2nd January 2013, 02:34 AM   #28
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If i remove all of the outputs and drivers from the right channel the 51 volts remains..

If i remove the C2229 the voltage is gone..

So i guess i will go touch up all of the solder connections in that channel and test the transistors..

If i do find that the C3229 is defective is there a good sub for it ??

The collector of the C2229 connects to the base of the TIP32C
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Old 2nd January 2013, 03:15 AM   #29
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You cannot have a loss of negative rail on the center leg of the transistors (PNP outputs and drivers) unless there is a bad connection to the negative rail. I'm assuming that this is a standard Asian design that takes the output from the emitters of the outputs.
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Old 3rd January 2013, 09:20 PM   #30
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I have the outputs and Drivers roved from the right channel..

I reflowed all the solder connections in the right channel..

Heres what i get on the pads for the Tip 31c,32c

TIP31C
Base:-53.2
Collector:52.9
Emitter:0.00

TIP32C
Base:-53.2
Collector:-53.3
Emitter:0.00

Theese voltages still dont look right to me any thoughts?
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