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Sansui 9090db will not put out sound, help please~

C5Chris

New Member
Good Morning AK! I am a new member to the Forum yet have lurked for help for over a year and love the site!

After much excitement getting a Sansui 9090db for my Feb birthday this year, and enjoying it the past 45-50 days, it has stopped.

The previous owner said he replaced the Power Supply ten years ago, and everything has worked great. I used Deoxit on the pots and it has sounded awesome. The Dolby didn't work until the pots were cleaned out and then it has worked as well.

I was playing new records from Sundays record show and when switching out to a new LP and the music wouldn't play. I had changed nothing, the lights are on and the power button is green. There was also a melting plastic, chemical smell for a bit as well, that seemed to generate from the front of the receiver, middle to the right. When this was happening I switched to the FM tuner, it played, then when I switch back from AUX, none of it worked again. I have been so bummed for the last couple of days. None of my other Vintage amps/receivers sound the same, sad.

Well, I have spent the last 2 nights searching the forum and reading past posts, and I am sure the repair is probably more then I could handle, I have only sprayed out Pots.

I have read the posts about suggestions of who can repair that are really trusted and talented Techs for repair, yet they are quite old post and some say the best people are backlogged for a year.

So please any suggestions on who is the best, trusted audiophile techs out there, to have my 9090 brought back to life. I know there are the Ebay choices, just worried about who is the best and most trusted to do it right, and relatively reasonable.

I am in the Springfield, Mo area but could ship or travel, yet hoping for someone within a weekend drive or so. Any type of suggestions are welcome and thanks for taking your time.

Chris
 
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I would remove the cover and do a visual inspection.There are fuses in there but I can't remember if they're accesed from the top or bottom.Check all your connections.Could be your turntable maybe?
 
Now I am assuming you term "power button is green" is the protection indicator lamp. This means that the power amp side of your DB is OK. The Front of the receiver middle to right is where the Dolby Board is located. I would try this first if you have another receiver/amp with removable pre/main plugs. Remove the pre/main amp jumpers (The "U" shaped metal plugs) from you DB and your other amp. Then using RCA cables plug into the pre out of the good amp and run them into the Main In connectors of the DB. Make sure the volume on the DB is turned down to a reasonable level, power up both units. The source amp will supply the signal to your DB's power amp side. Hopefully you will get a good strong output from the DB. The volume control, balance, and tone controls will work on the DB but the selector/and Dolby switches will be isolated in the preamp section.

What does this do for you? If the DB power amp side is OK you will get good clear audio. If the power amp side sounds good then we have somewhat isolated the problem which most likely is the Dolby circuit to include the board the switches and possibly the inter connect cables or flex PCB. At this point I would get DeOXit and really work out the switches. Read the DeOxit post and make every effort to get the DeOxit INTO the switches. That may help or fix. It may clear up some of the issues but if not there are issues that can only be resolved with a Dolby Board rework. Since this is a labor intensive task your hope for reasonable cost becomes relative.
 
I checked my wiring diagrams and the balance, tone control, and volume are controlled in the pre amp section so the volume, balance, and tone will be controlled by the source amp. Make sure your volume is turned down on the source amp before firing up the DB.
 
I would remove the cover and do a visual inspection.There are fuses in there but I can't remember if they're accesed from the top or bottom.Check all your connections.Could be your turntable maybe?
Thank you, I tried these items instantly, I appreciate the suggestions.
 
Thank you so much, this helps me make some deductions, I will let you know when I get these steps finished. I really appreciate such detail and I would not have known I could bypass like this to even check that.
 
I checked my wiring diagrams and the balance, tone control, and volume are controlled in the pre amp section so the volume, balance, and tone will be controlled by the source amp. Make sure your volume is turned down on the source amp before firing up the DB.
Thank you so much, I am following these steps and will post the result.
 
I checked my wiring diagrams and the balance, tone control, and volume are controlled in the pre amp section so the volume, balance, and tone will be controlled by the source amp. Make sure your volume is turned down on the source amp before firing up the DB.
Thank you so much, I am following these steps and will post the result.
 
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