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Old 12th November 2006, 10:03 AM   #11
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Old 12th November 2006, 11:21 AM   #12
jaycee is offline jaycee  United Kingdom
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It could be me but it looks like a channel's heatsinks and output devices are missing.
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Old 12th November 2006, 11:28 AM   #13
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Default pioneer

Hi there yeh all parts i put in are just pushed into board not soldered they were taken out for testing cheers
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Old 12th November 2006, 03:55 PM   #14
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Homertooties
Look carefully at the two large PSU caps. Notice how the plastic labels have shrunk down ,a good indication that they are running to hot probably leaking soon if not already.
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Old 12th November 2006, 04:18 PM   #15
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Default pioneer

Hi there many thanks for reply ill rip the caps out now and solder a temp pair in....cheers
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Old 12th November 2006, 04:55 PM   #16
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Hi,

I have opened many (even new) Pioneer amps that have caps looking like that, only little short plasic film. Look for bulging and leaks instead.

Edit: And age makes them increase their esr.
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Old 12th November 2006, 05:10 PM   #17
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Default caps

Hi there still does it with other replacement caps ,however when i take the 15volt reg and 2sc tranny out (low voltage supplies it doesnt do it,so im gonna put those 2 parts back in and disable there output from feeding the board many thanks for reply
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Old 12th November 2006, 11:28 PM   #18
ilimzn is offline ilimzn  Croatia
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The caps are fine... but you are missing the output stages of the amps (transistors and heatsinks)!
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Old 12th November 2006, 11:47 PM   #19
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I recently repaired a wall-wart transformer for a friend's D-Link router. The problem was three bad electrolytic caps - all Teapo. Are the tops bulging on any of them?
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Old 17th November 2006, 09:19 PM   #20
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Default pioneer fixed (hoorah)

Hi all finally fixed the pioneer a605 r

Went through the motions of replacing many parts which have now been put back as was ,unbelievable fault,got this amp cheap due to repair of low power supplies,however due to many hours of trying to source fault,did a test on the volume ribbon cable seven wires,did a continuity test from 1 t0 1 and got 1 to 7 alarm bells ringing some plank in past had put this cable in wrong way round so now the amp was not getting + and - 15vdc up the front end,unbeleivable,detatched pioneers crappy socket and soldered each cable through board,

Hey presto amp fixed the old saying springs to mind things are not always as they seem

Many thanks for input members......
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