Video Gain - Omron 8025G Maintenance Manual

ADJUSTMENTS SECTION 7
Figure
7-3.
Normal 8025 CRT presentation.
(24
line display shown)
If required, adjust the BRIGHTNESS control on the keyboard to just "extin-
guish" the raster. Figure 7-3 illustrates the correct setting. Figures 7-9 and
7-13 show displays for which the BRIGHTNESS control is set too high.
7.4.2 +55 V de (B+) Adjust
The B+ adjustment (R134) is located on the Monitor Deflection Board (see
Figure 7-4).
Connect the positive lead of the multimeter to the cathode of CRl06, and
the negative lead to the anode of VRlOl (see Figure 7-4). Set R134 to provide +55
volts de.
7.4.3
Video Gain
The video gain adjustment (Rl19) is located on the Monitor Deflection Board
(see Figure 7-4).
Adjust Rl19 (see Figure 7-4) just enough for maximum contrast between the
characters and the black background.