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Old 21st January 2011, 05:48 AM   #21
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PIN9:-120.0
PIN14:-120.0


RA18 is a 330 ohm and it measures 328.7 ohms

RA19 is a 200 ohm and measures 199.1
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Old 21st January 2011, 05:51 AM   #22
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It appears that there is a bad connection between the cathode of DP11 and R18.
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Old 21st January 2011, 06:05 AM   #23
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I reflowed the solder on all parts from DP11 to RA18 and have -120.1 volts still on pins 9 and 14.

I have no voltages on QA1 and QA2 still.
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Old 21st January 2011, 06:08 AM   #24
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QA1 is fed via DA1. Is it open?
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Old 21st January 2011, 06:12 AM   #25
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No I checked it out of the board and it measures 0.487 and the other direction 0L
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Old 21st January 2011, 06:17 AM   #26
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There's an open trace between the cathode of DP11 and that diode. The trace may be under some other components.

Run a 'fused' jumper (2 amp max) between the cathode of DP11 and the anode of DA1. Does the fuse blow?

If not, does the amp produce audio?
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Old 21st January 2011, 06:18 AM   #27
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QA1 on the cathode side i get 0.3 volts on the other side i get -92.9 volts

And voltage directly across it :93.2
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Old 21st January 2011, 06:26 AM   #28
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Ill have to go get a fuse in the morning to try it.
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Old 21st January 2011, 06:42 AM   #29
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Ok i did find a fuse. Tryed that and still no output.

With that jumper hooked up i still get no voltages on QA1 and QA2

the voltage is like .03 volts
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Old 21st January 2011, 06:49 AM   #30
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Look at the attached images. You can see how DP11 connects to the points I mentioned. +24VEE isn't now connected as shown. You have to determine why. The jumper should have restored the connection.
Attached Images
File Type: jpg xxx650001.jpg (125.2 KB, 61 views)
File Type: jpg xxx650002.jpg (35.3 KB, 61 views)
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