Pioneer VSX-9500S A/V Receiver under maintenance, need support...

smartx21 · 17th November 2010, 12:46 AM

A friend of mine asked me to help get his A/V receiver up and running. Some guys have tried to fix it, without success.
First informations are as follows:
After an unpredictable time, it goes into protection mode, and only resets if powering off and on.
There is a pair of output transistors missing.

I will post some photos.
Does anyone have schematics for this amp? (I haven't tried to find them as yet).
Thanks for any advice.
Regards,
Max.

smartx21 · 17th November 2010, 01:01 AM

By the moment, I've found schematics (service manual) for VSX-9700S only...

ostripper · 17th November 2010, 03:48 AM

Quote:

Originally Posted by smartx21

A friend of mine asked me to help get his A/V receiver up and running. Some guys have tried to fix it, without success.
First informations are as follows:
After an unpredictable time, it goes into protection mode, and only resets if powering off and on.
There is a pair of output transistors missing.

I will post some photos.
Does anyone have schematics for this amp? (I haven't tried to find them as yet).
Thanks for any advice.
Regards,
Max.

Channel w/ missing OP's is 'floating" ... triggering protect circuit. Either short that channel out with 1k resistor to ground or fix it. Did this on my 4.1 sony receiver before I "moved on" to DIY.

OS

infinia · 17th November 2010, 04:44 AM

Usually DC on one of the outputs sends a relay open somewhere. I usually bypass the relay and using a variac or a series light bulb start trouble shooting to find the fault.

smartx21 · 17th November 2010, 11:43 PM

Thank you OS and Infinia. I was thinking of both situations, and I will manage to execute those procedures.
Attached some pictures.
Regards,
Max.

ostripper · 04:36 AM

Your main PS capacitors are all bad by the looks of things. (melted sleeves)

Recapping is a must in this case .. that could be the main problem !!!

It has been along time since I saw an OEM amplifier .. How do they get away with only 8200uF X 2 ??? Mine is 40,000+ X2 !
OS

AKN · 18th November 2010, 04:54 AM

Hi ostripper,

It's common that Pioneer amps have caps with sleeves looking like that (from new).

jitter · 18th November 2010, 05:23 AM

Agreed. Besides, the tops are flat and not bulged.

smartx21 · 12th January 2011, 01:39 AM

The only free manual available throughout the internet is only 16 pages long, out of 40+, and is for VSX-9700S, not 9500.
So, if anybody has the whole document and would like to share, please let me know.
Thanks.
Max.

PeterLeest · 12th January 2011, 09:36 AM

I have it in jpeg format, file is quite huge, about 50+ MB, just upload to megaupload, send me a mail if you can't retrieve.

MEGAUPLOAD - The leading online storage and file delivery service

17th November 2010, 12:46 AM	#1
smartx21 diyAudio Member Join Date: Mar 2010 Location: Santiago, RS/ Brasil	Pioneer VSX-9500S A/V Receiver under maintenance, need support... A friend of mine asked me to help get his A/V receiver up and running. Some guys have tried to fix it, without success. First informations are as follows: After an unpredictable time, it goes into protection mode, and only resets if powering off and on. There is a pair of output transistors missing. I will post some photos. Does anyone have schematics for this amp? (I haven't tried to find them as yet). Thanks for any advice. Regards, Max. __________________ We should not dwell on what we do not have, but, instead, be grateful for what we do have!

17th November 2010, 01:01 AM	#2
smartx21 diyAudio Member Join Date: Mar 2010 Location: Santiago, RS/ Brasil	By the moment, I've found schematics (service manual) for VSX-9700S only... __________________ We should not dwell on what we do not have, but, instead, be grateful for what we do have!

17th November 2010, 04:44 AM	#4
infinia diyAudio Member Join Date: May 2005 Location: Californication	Usually DC on one of the outputs sends a relay open somewhere. I usually bypass the relay and using a variac or a series light bulb start trouble shooting to find the fault. __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

18th November 2010, 04:33 AM	#6
ostripper diyAudio Member Join Date: May 2008 Location: Albany , NY (smallbany)	Your main PS capacitors are all bad by the looks of things. (melted sleeves) Recapping is a must in this case .. that could be the main problem !!! It has been along time since I saw an OEM amplifier .. How do they get away with only 8200uF X 2 ??? Mine is 40,000+ X2 ! OS __________________ Mongrel website , always current and updated : http://67.248.209.21/D%3A/WEBSITE/ Last edited by ostripper; 18th November 2010 at 04:36 AM.

18th November 2010, 04:54 AM	#7
AKN Enjoy good sound diyAudio Member Join Date: Aug 2005 Location: In the middle of Sweden	Hi ostripper, It's common that Pioneer amps have caps with sleeves looking like that (from new). __________________ / Anders


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18th November 2010, 05:23 AM	#8
jitter diyAudio Member Join Date: Aug 2004 Location: Eindhoven, The Netherlands	Agreed. Besides, the tops are flat and not bulged.

12th January 2011, 01:39 AM	#9
smartx21 diyAudio Member Join Date: Mar 2010 Location: Santiago, RS/ Brasil	The only free manual available throughout the internet is only 16 pages long, out of 40+, and is for VSX-9700S, not 9500. So, if anybody has the whole document and would like to share, please let me know. Thanks. Max. __________________ We should not dwell on what we do not have, but, instead, be grateful for what we do have!

12th January 2011, 09:36 AM	#10
PeterLeest diyAudio Member Join Date: Jun 2004 Location: Singapore	I have it in jpeg format, file is quite huge, about 50+ MB, just upload to megaupload, send me a mail if you can't retrieve. MEGAUPLOAD - The leading online storage and file delivery service

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