Sansui AU-9900a Service Manual Needed. - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools

Equipment & Tools From test equipment to hand tools

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 27th August 2009, 04:37 PM   #1
diyAudio Member
 
Join Date: Aug 2009
Location: Adelaide
Default Sansui AU-9900a Service Manual Needed.

Well, I've just received my new Sansui AU-9900a - a wonderful, well-built machine! The stereo imaging is superb. It used to belong to a church and was driven only on Sundays, literally. But given it's age, I will be re-capping it soon and then I'll give it tune-up. Can anyone out there share their copy of the service manual with me? Many thanks.

xxxfarmerfranco@gmail.comxxx (delete the xxx before & after address)
  Reply With Quote
Old 3rd September 2009, 08:49 PM   #2
diyAudio Member
 
Geek's Avatar
 
Join Date: Sep 2004
I might have one of these coming up for service too and could use a manual.

geek <at> classicvalve <dot> ca

Cheers!
  Reply With Quote
Old 4th September 2009, 04:02 AM   #3
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi Black Gate,
Blindly "recapping" an amplifier only really helps when you replace the bad capacitors. It's certainly not going to correct the several other issues that crop up in older equipment.

I had a look in your user information, trying to discern your level of technical experience, but I see you haven't filled anything out yet. No insult intended, but I always like to see if someone knows how to service equipment rather than just swap parts. It gives me an idea how much damage may or may not occur.

I would caution other members to not take a soldering iron to anything unless the have some training (of some sort) and do know exactly what they are doing.

-Chris
__________________
"Just because you can, doesn't mean you should" İ my Wife
  Reply With Quote
Old 29th November 2009, 04:35 AM   #4
hew128 is offline hew128  Singapore
diyAudio Member
 
Join Date: Jan 2006
Location: Singapore
Hi "Blackgate",

I have a AU-9900A too and was recapping it a couple months ago.

I discovered the advise Anatech (Christ) is providing is generally correct. For the 9900A, all you really need to be is change all the old electrolytic caps.

I managed to locate the service manual (from Rapid share) and the bias is 50mV - basically a Class-A int amp.

I did find the sound a bit too raw for myself so I changed the film caps on the pre-amp board as well as a few of the film caps on the driver board. Please note there are a two bi-polar caps on the driver board, a bi-polar on the psu board and another two bi-polar on the pre-amp board.

Also becareful when desoldering on the pcb(s) as this particular unit has pcb masks which are a little mis-aligned (compared to other Sansui's inmy collection). My best advise is to take a high-res pix of the pcb(s) - both sides, before you start.

I ran into a dry-joint issue on the driver board a couple times. The most troublesome incident was due to a joint which I loosen by mistaken on a resistor when searching for another hole. This cause the amp to go into protect on-off repeately. When I checked via multi-meter the problematic joint shows connectivity. Managed to correct the issue when I notice the problematic joint look a little higher than the neighbours.

Sounds like a valve amp now! In fact, it sounds so good I sold my AU-20000 and kept the AU-9900A!
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sansui G-6700 service manual needed markoramius Solid State 6 3rd July 2009 12:37 PM
Sansui au-d9 service manual mosfet1 Solid State 1 1st October 2008 03:49 AM
SANSUI XR-Q7 service manual east electronics Solid State 0 5th March 2008 01:25 PM
Service Manual For Sansui AU-D5 needed Wynand Solid State 0 24th April 2006 12:48 PM
Sansui TU-X1 FM Tuner : Service Manual Needed bordins Analog Line Level 1 4th March 2006 02:26 PM


New To Site? Need Help?

All times are GMT. The time now is 06:24 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright İ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2