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Old 17th December 2010, 03:37 PM   #11
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I lifted the 494 off the board and found a broken trace under it and amp powers up and plays fine now.
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Old 17th December 2010, 03:38 PM   #12
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Was it on pin 16?
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Old 17th December 2010, 05:13 PM   #13
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NO pin 7 Amp was working now its doing it again. Pin 16 is high i tracked it back to a diode (1n4148) im gonna lift 1 side and check for leakage.
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Old 17th December 2010, 05:17 PM   #14
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That was the initial open ground that was seen in the first voltages you posted.

The diode likely goes back to one pin on the 324. If you power it up with the diode out of the circuit, be careful.
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Old 5th March 2011, 08:28 PM   #15
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I got this amp back in for repair the guy said his speaker wires touched when hooking it up.

I opened it up and found a bad output replaced it and now the amp has no output and has the following voltages on the output terminals.

Left channel:0.42 volts

Right channel:0.42 volts

I have 0 volts across every emitter resistor

I have rail voltages -59.8 and positive 54.0

On the op-amps that sit on the input board i have the following voltages
( 2068D)

1:111.45
2:9.76
3:9.42
4:10.0
5:9.42
6:10.42
7:11.46
8:12.21

Any ideas on what to check?
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Old 5th March 2011, 08:42 PM   #16
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Ok i got the amp to produce output it had a broken leg on a tip 41C

Now the output out of both channels is distorted
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Old 5th March 2011, 09:52 PM   #17
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Do you have negative supply voltage on pin 4 of the 2068?
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Old 18th June 2011, 02:07 AM   #18
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Well got this thing back again..

It lasted from March to now with no problems.


He said he took the card out and flipped it around with the amp on ..


So now Pin 16 on the 494 is high once again its at 12.94 when powerd up and drops to 10.94 volts and remains constant..


Pin16 connects directly to a diode then branchs off to something else which i havent tracked down yet..


Is Pin 16 usually controlled by a transistor ?
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Old 18th June 2011, 06:31 PM   #19
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Location: Louisiana
Pin 16 being driven high likely means that the amp is in protect mode. Have you checked all of the outputs?

Post a photo of the inside of the amp if you can't find the fault. I'm unfamiliar with this amp.
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