i have some pics of unwell pioneer - Page 2

homertooties · 12th November 2006, 10:03 AM

jaycee · 12th November 2006, 11:21 AM

It could be me but it looks like a channel's heatsinks and output devices are missing.

homertooties · 12th November 2006, 11:28 AM

Hi there yeh all parts i put in are just pushed into board not soldered they were taken out for testing cheers

XEAGLEKEEPER · 12th November 2006, 03:55 PM

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.

homertooties · 12th November 2006, 04:18 PM

Hi there many thanks for reply ill rip the caps out now and solder a temp pair in....cheers

AKN · 12th November 2006, 04:55 PM

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.

homertooties · 12th November 2006, 05:10 PM

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

ilimzn · 12th November 2006, 11:28 PM

The caps are fine... but you are missing the output stages of the amps (transistors and heatsinks)!

keith721 · 12th November 2006, 11:47 PM

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?

homertooties · 17th November 2006, 09:19 PM

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......

12th November 2006, 11:28 AM	#13
homertooties diyAudio Member Join Date: Nov 2005 Location: suffolk	pioneer Hi there yeh all parts i put in are just pushed into board not soldered they were taken out for testing cheers

12th November 2006, 03:55 PM	#14
XEAGLEKEEPER diyAudio Member Join Date: Jan 2006 Location: central Iowa	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. __________________ Ret. USAF... AKA- Avionic * Solder slinger for hire...*

12th November 2006, 04:18 PM	#15
homertooties diyAudio Member Join Date: Nov 2005 Location: suffolk	pioneer Hi there many thanks for reply ill rip the caps out now and solder a temp pair in....cheers

12th November 2006, 04:55 PM	#16
AKN No snake oil diyAudio Member Join Date: Aug 2005 Location: In the middle of Sweden	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. __________________ / Anders

12th November 2006, 05:10 PM	#17
homertooties diyAudio Member Join Date: Nov 2005 Location: suffolk	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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12th November 2006, 10:03 AM	#11
homertooties diyAudio Member Join Date: Nov 2005 Location: suffolk

12th November 2006, 11:21 AM	#12
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	It could be me but it looks like a channel's heatsinks and output devices are missing.

12th November 2006, 11:28 PM	#18
ilimzn diyAudio Member Join Date: Feb 2005 Location: Zagreb	The caps are fine... but you are missing the output stages of the amps (transistors and heatsinks)!

12th November 2006, 11:47 PM	#19
keith721 diyAudio Member Join Date: Oct 2006	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?

17th November 2006, 09:19 PM	#20
homertooties diyAudio Member Join Date: Nov 2005 Location: suffolk	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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