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Old 27th September 2012, 03:08 AM   #11
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Here is a photo, keep in mind I have not removed this board from the heat sink yet to inspect the bottom of the board.
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File Type: jpg 250M CT 001.jpg (988.3 KB, 54 views)
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Old 27th September 2012, 07:16 AM   #12
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Do you read 0 ohms between the two points indicated by the arrow?

Are you using the inner terminal as the positive speaker terminal?
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File Type: jpg 250M parts board pic 001x.jpg (182.9 KB, 53 views)
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Old 27th September 2012, 09:06 AM   #13
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Quote:
Originally Posted by Perry Babin View Post
Do you read 0 ohms between the two points indicated by the arrow?

Are you using the inner terminal as the positive speaker terminal?
Yes I read 0 ohms now I was using the wrong pad on the board.

I read 0 ohms between the arrows in the pic and I read 0 ohms from the pads to the + speaker terminal.
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Old 27th September 2012, 09:11 AM   #14
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Touch a dummy load across the speaker terminals to see if the 2v drops to 0v and remains there after removing the dummy load.
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Old 27th September 2012, 09:29 AM   #15
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Yes touching a dummy load to the terminals drops the dc to 0 but it returns when the load is removed.
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Old 27th September 2012, 09:46 AM   #16
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If the current draw doesn't increase when you touch the dummy load, the output stage is likely OK.

Is either Q125 or Q126 leaky?

Check all of the resistors on the part of the diagram shown below to confirm that all are within tolerance.
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Old 28th September 2012, 06:39 AM   #17
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Q125 and Q126 were not leaky. Every resistor I tested was removed from the circuit and all tested within tolerance. Some reason my voltage has jumped up to over 3vdc now.
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Old 28th September 2012, 06:49 AM   #18
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Reinstall Q125/6. Post the DC voltage on all 3 terminals of Q101, 102 and 103.
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Old 28th September 2012, 07:46 AM   #19
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Q101

B: -1.624
C: +14.54
E: -1.620

Q102

B: -1.820
C: +23.99
E: -2.320

Q103

B: -3.878
C: -2.520
E: -4.47
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Old 28th September 2012, 06:12 PM   #20
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With the black probe on the negative speaker terminal. what is the DC voltage on the positive terminals of C108 and C110?
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