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Old 8th January 2013, 07:04 AM   #11
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This one has the revision done for the initial power up issue.

Pins 1 and 2 are soldered together and pin 13 has been removed.

pin 1: 1.776
pin 2: 1.776
pin 3: 13.65
pin 4: 0.095
pin 5: 1.381
pin 6: 4.41
pin 7: 4.70
pin 8: 0.785
pin 9: 0.785
pin10: 4.90
pin11: 8.31
pin12: 0.001
pin13: missing
pin14: 0.001

I posted a pic of the MOD the description of it was included with the copy of the schematic I sent you awhile back.
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File Type: jpg lm339 001.jpg (998.4 KB, 20 views)
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Last edited by seankane; 8th January 2013 at 07:15 AM.
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Old 8th January 2013, 07:20 AM   #12
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A pic of the MOD.
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File Type: png X6 mod.png (126.5 KB, 20 views)
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Old 8th January 2013, 07:24 AM   #13
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Desolder leg 1 from pins 1 and 2 of the 339. Does that allow the amp to power up?
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Old 8th January 2013, 07:29 AM   #14
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No it does not because pins 1 and 2 are connected by a trace on the board anyway.
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Old 8th January 2013, 07:36 AM   #15
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Do you still have approximately 1.7v on pins 1 and 2?
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Old 8th January 2013, 07:38 AM   #16
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yes
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Old 8th January 2013, 07:44 AM   #17
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If you have a 339, replace the one in the amp. With the input on pins 4-7, the output should be open and pulled up by R19.

There is a chance that the SD pin on the 3526 is causing the problem but the 339 is easier to replace.
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Old 8th January 2013, 07:48 AM   #18
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Should I remove all the mods because R19 is fed from pin 13 which is missing on the lm339.
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Old 8th January 2013, 07:50 AM   #19
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You can leave the leg of the 34064 disconnected.
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Old 8th January 2013, 07:58 AM   #20
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replaced 339 same result.
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