990db vs 9090db circuit board reference.

[jetman1979]

Ok Quick question I pulled up the circuit board reference and printed it out. My question is are the numbers the same for a 990db as they are for a 9090db? Example would the F-2656 power supply board # be used in both sets?
Also without removing the top of my unit can you tell me if the number is stampted on the board?

 

[hpsenicka]

You should find the board number silk-screened onto the circuit board some place. It may or may not be visible when installed.

 

[Donkey!]

As far as I know, the 990DB is just the EU version of the 9090DB, just with a black face.

They both were made in Japan.

However, sansui is known for revisions and changes. So make sure.

Hell. take the top off and have a look :thmbsp:

 

[LBPete]

The only difference between a 990DB and a 9090DB is the color of the faceplate and knobs. Everything else is identical for a given month of production. There were a number of running changes made to these models during their production so you may see some difference between boards manufactured at different times. The board numbers typically don't change.

- Pete

 

[CDFixer]

LBPete is right. The only number that you will find on the circuit board is the board number such as F-XXXX. Sansui had part numbers for these boards but those numbers are nowhere to be found on any board that I have ever seen.

There are production differences as LBPete notes. For example the Driver board on the early units had a transistor bias circuit, and the later ones had a diode bias circuit but they are interchangeable and Sansui never made change or note in any manual that I have seen.

Also note that the service manual designates the units as Model A and Model B

The 990/9090DB is Model A
The 890/8080DB is Model B

This A or B is located under the antenna mount on the rear of the chassis.