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Old 23rd August 2007, 10:42 PM   #11
genes66 is offline genes66  United States
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fets center leg 13.75v all 4 transistors read the same and the resistors read same voltage on both sides.
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Old 23rd August 2007, 10:48 PM   #12
genes66 is offline genes66  United States
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it is kind of hard to tell which resistors to test because they are very small like chip capacitors do you know which one to check r5,r6 r17,r18,r19,r35,r36.r37.r58,r59 they are tiny
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Old 23rd August 2007, 10:51 PM   #13
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If those were measured with the remote applied, it seems like D6 and D7 are open. Or, there could be a weak trace between D6/7 and the third leg of the transistor.

Measure the voltage on the striped side of D6/7 with remote applied. If they have ~12v, the trace is likely open. This could be due to leaking electrolyte from the large filter capacitors.
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Old 23rd August 2007, 10:55 PM   #14
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The important resistors are the two closest to D6 and D7. R17 and R35, if I'm not mistaken.
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Old 23rd August 2007, 11:32 PM   #15
genes66 is offline genes66  United States
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i getting a reading of 13.42v on the striped side of d6 and d7
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Old 23rd August 2007, 11:35 PM   #16
genes66 is offline genes66  United States
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do you think the fets are good and maybe large capacitors are bad
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Old 24th August 2007, 12:02 AM   #17
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The FETs are likely OK.

If the capacitors leaked, the electrolyte could have damaged the trace.

You could try running a jumper from the striped side of D6/7 to the third leg of the transistor to see if the amp will power up normally. If you do this, the jumper should be fused with a 1 amp fuse and you should have a 10 amp fuse as the main power fuse in the amp.

If the amp powers up and operates properly, you would need to disassemble the amp, remove the flter caps, clean up the corrosion and replace the capacitors (with new caps, don't reinstall the old caps).
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Old 24th August 2007, 12:17 AM   #18
genes66 is offline genes66  United States
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i am guessing that the bigger caps are the filter caps this amp has 6 big caps what are the 4 taller ones for? the 2 closest to d6 and d7 is what you are referring too right c24 and c40 i hope.do you want me to run a jumper from d6 and d7 to third leg of transistor 2n6714?
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Old 24th August 2007, 12:29 AM   #19
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Correct, the trace that connects Q30 to D6 and D7 passes under the two filter caps nearest to the diodes. These are the ones you need to remove.

You need to use a fused jumper (very important). A standard inline fuse holder with a 1 amp fuse may be long enough to reach between the diodes and Q30. Don't jump it without a fuse.
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Old 24th August 2007, 01:14 AM   #20
genes66 is offline genes66  United States
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2n6714 Q30 is getting 13.75v on third leg does it matter if i run a jumper from D/6andD/7 if voltage is present on third leg of transistor?.
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