Modifying the Sony ST-SB920 Tuner

 from my own Personal Experience

Please be aware that mains voltages are present. Do not remove cover until unit is un-plugged from the Mains Electricity Supply. Do not plug in again until the cover is replaced.

 

Main Chassis removed from the tuner showing points of interest:

1 Location of I.F. Filters
2 RF and Stereo Gain Controls
3 Location of Audio for Conrad RDS Manager
4 Squelch Links
5 RDS Chip

 

 

AUDIO FEED TO CONRAD RDS MANAGER

Firstly to connect the tuner to the Conrad RDS Manager. This can be done with out having to remove the chassis. So if you do not intend to replace the filters it is a quick and easy job.

 

 

Connections are at JW116 and the end of C269 by the connector, (which is the nearest Earth Point).

 

 

SQUELCH MOD

The second modification can also be carried out without removing the chassis. This is to disable the squelch or muting. Two links require cutting, they are JW 75 and JW 72. Location of the links can be seen from the picture below:

 

 

RF GAIN & STEREO SENSIVITY

The Gain control, RV231, seems to be factory set to just past half