Technical Note: TN008

@atari

Published in 

atari

 · 3 years ago

Date: 17 April 1986

Re: STM UHF Modulator Adjustment

The UHF TV output may not appear central on some TV sets, slight modulator adjustment should correct inconsistent positioning.
Proceed as follows:-

1. Only Qualified service personnel should attempt to carry out the following procedure on the 520STFM and 1040STFM as mains voltage exists within these models.
2. Remove plastic cover and R.F. shield
   
3. Remove modulator shield
   
4. Apply power and adjust the plastic cross head screw on the modulator PCB until the display is central.
   
5. Replace shields and all screws.
   

As well as producing a modulated output, the STM also provides an un-modulated composite colour output on pin 2 of its 13-pin Din socket which connects to pin 20 of the Atari Scart Connector.

-END-