Sansui 990DB AM/FM no sound Help Help!

[PooPoo]

not getting any sound from the AM/FM all the other inputs works fine. Anyone know what the problem is?

 

[PooPoo]

 

[DougBrewster]

check you have +12v to ground at pin 01 on the RF power supply board F-2619; it's the small board behind the tuner signal meters. This board cooks itself; could be just a dry joint..

 

[LBPete]

Clean the function and dolby switches.

Please post the serial number for the database. Click on the link in my signature block.

- Pete

 

[PooPoo]

Clean the function and dolby switches.

Please post the serial number for the database. Click on the link in my signature block.

- Pete

Serial numbers just for the 990DB or all my other sansuis?

 

[PooPoo]

check you have +12v to ground at pin 01 on the RF power supply board F-2619; it's the small board behind the tuner signal meters. This board cooks itself; could be just a dry joint..

Ok I will check that board when I get home. Thanks Doug

 

[LBPete]

Serial numbers just for the 990DB or all my other sansuis?

All of them if you can get to the serial numbers. The database is a great resource for determining when the units were built. It also helps estimate how many were built and can document production changes that frequently were not documented by Sansui.

- Pete

 

[PooPoo]

check you have +12v to ground at pin 01 on the RF power supply board F-2619; it's the small board behind the tuner signal meters. This board cooks itself; could be just a dry joint..

I checked pin 01 and no voltage. So I recapped
All the caps and still nothing??? Any idea what else?

 

[DougBrewster]

do you have 40 or so volts arriving at pin 3 on that same board?

 

[naderpe]

The 303 trany

 

[PooPoo]

do you have 40 or so volts arriving at pin 3 on that same board?

60v I'm showing

 

[PooPoo]

The 303 trany

D313 transistor?

 

[LBPete]

It's usually a combination of bad solder joints on the ceramic resistors and/or the transistor on the heat sink is blown.

- Pete

 

[PooPoo]

It's usually a combination of bad solder joints on the ceramic resistors and/or the transistor on the heat sink is blown.

- Pete

The D313 transistor?

 

[PooPoo]

 

[PooPoo]

View attachment 917774

Is it this one?

 

[LBPete]

Yup. If it tests OK, then start reflowing the solder joints for the two ceramic resistors. Actually even if the transistor is bad, reflow the solder joints.

- Pete

 

[PooPoo]

Reflowed all the joints and still nothing???
Still nothing???

 

[LBPete]

Did you test the transistor? What are those speaker wires on the left side of the board? That's not original, where do they go? It also looks like someone added a bullet connector to the ground wire. Be sure you have a good ground.

- Pete

 

[PooPoo]

The speaker wire is just a temporary extension for the two red power wires so I have room to work on instead of trouble shooting in such a tight space.