Brightness And Cut-Off Circuit - NEC MultiSync 4FGe Service Manual

3-2. Brightness and cut-off circuit

The raster brightness level is determined by clamping the video output blanking level from IC703. The DC clamp
level is determined by using the voltage drop of R780G (which is basically determined by the current of Q78lG).
The raster brightness level is determied by the voltage at ihe output of lC704-3. When the voltage of 0781 G emitter
is same voltage as the output of lC704-3, the DC clamping level is at cut-off level.
120v 0 ;
R905
----it
CPU
R790
(Fig 3-2-l) Brightness and cut-off Circuit
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