Sansui 9090 service bulletin changes help

[quadmatrix82]

Hi Sansui experts, I am in the process of restoring my Sansui 9090 which I’ve had in long term storage, it’s time to do the service bulletins and hoping I can get some pointers. Looks like it was made in Feb 1976.

It says to remove the jumper to the L01-2 coils on the driver board F-2436-1, my board has no coils but a jumper pictured in red close to c-08-7 caps, does this still need to be removed? If not are there any jumpers here I have missed?

What is the best way to remove the GND points for the relay mentioned in the bulletin scratch out the track?

F-2436- remove jumpers for 38/6 and 37/5 - i don't see any? Photo attached looks like someone has reflowed that section before

Hope that made sense, thanks in advance for your help

 

[mrk229]

Hi Sansui experts, I am in the process of restoring my Sansui 9090 which I’ve had in long term storage, it’s time to do the service bulletins and hoping I can get some pointers. Looks like it was made in Feb 1976.

It says to remove the jumper to the L01-2 coils on the driver board F-2436-1, my board has no coils but a jumper pictured in red close to c-08-7 caps, does this still need to be removed? If not are there any jumpers here I have missed?

What is the best way to remove the GND points for the relay mentioned in the bulletin scratch out the track?

F-2436- remove jumpers for 38/6 and 37/5 - i don't see any? Photo attached looks like someone has reflowed that section before

Hope that made sense, thanks in advance for your help

It looks like you may have an already modified driver board? Pictures of the top would confirm or deny.

Use a hobby knife to cut across the trace. I sometime make two cuts very close together and peel out the trace in between the cuts. Not sure it is the best way but it works for me.

 

[quadmatrix82]

It looks like you may have an already modified driver board? Pictures of the top would confirm or deny.

Use a hobby knife to cut across the trace. I sometime make two cuts very close together and peel out the trace in between the cuts. Not sure it is the best way but it works for me.

Thanks for the advice I think this board already had the coil jumpers removed here’s the board rebuilt just waiting on new zeners to arrive

 

[mrk229]

Thanks for the advice I think this board already had the coil jumpers removed here’s the board rebuilt just waiting on new zeners to arrive

The fuses cover the place where the coils/jumpers would have been, so you will have to confirm no jumper is there.