Sansui 9090DB Problems???

[GARDJBLAR]

see thats the only problem with these big beauties, These things are a royal PITA I wish you luck friend, at the very least you will be quite buffed up after lifting this thing 20 or 30 times to flip it over hahaha

:thmbsp: Just got one to trouble shoot On my way to the 6th lift.

 

[Kris_R]

patfont, I think a rebuild thread on the 9090DB as detailed as one of your famous Marantz threads is in order!

 

[GARDJBLAR]

Resistors on the way and I have some caps we will see @@

 

[sKiZo]

Gonna pin the dolby board long as you're in there?
Those are always fun ...

 

[GARDJBLAR]

Paul thanks a ton for walking me through this. I will try and get her up and running first and adjust bias and DC offset and let it play a bit. Then I would say a full recap is in order!

It works for me!

 

[Happyrock78]

ok parts have arrived, and I installed the 4 new outputs on the one channel:



The driver board had 14 resistors replaced and 8 e-caps, and the 2 VD1212's





Bias and DC offset are adjusted and I am now playing FM on my small mission work area speakers. Too heavy to carry up to the main system for now, maybe tommorow. The volume control is noisy so I hit it with deoxit. I am going to have to take some time and flush and clean and lube all the controls and switches. As a side note every light is working as well as meters. Gonna order some more parts and get this thing rebuilt, sounds very nice.

And again I would like to thank Paul for the guidance on this!

*******As a note for bias adjustment at the fuses, they are labeled wrong as far as channels go in the 9090DB SM.

Hi
I have a Sansui 9090db I just replaced the two files resistors with 180 ohm resistor and I got the rec to work . But how do I set the bias for the driver transistors and power transistor?