Mitsubishi Electric 1786FD2 Service Manual page 51

MEA 1786FD2 CRT Monitor Service Guide
5.2 Blanking CKT
To avoid the disturbed picture display on the screen , we have to blank the monitor in the
following situations.
(1) when display mode is changed.
(2) when the monitor enter the power saving mode.
(3) blank the vertical retrace line
when the " blank" signal becomes "high" Q209 "ON" , Q203 "OFF".G1 voltage is about ( -190 *
R253/(R253+R241)) ¡ Ü
and coupling to G1.During the vertical retrace interval , the G1 voltage will be drop down about 48V.
-184V. The signal which is IC201 (pin 16) is inverted and amplified by Q202,
Fig5 Brite & Spotkiller circuit
Circuit Operation Theory
5