Crt Disp1Ay.adjustments; Preliminary Procedure - Omron 8025G Maintenance Manual

ADJUSTMENTS SECTION 7
Set R25 for the desired click/beep volume. This adjustment sets the volume
for both click and beep.
Figu~e 7-2. Cursor Control Card click/beep
volume adjustment location.
7.4 CRT DISPLAY ADJUSTMENTS
7.4.1
NOTE: All display adjustments are made with the terminal operating,
the screen filled with data, and the cabinet removed.
WARNING: DANGEROUSLY HIGH VOLTAGES ARE PRESENT IN THE CRT AREA.
Preliminary Procedure
Turn the terminal on and enter characters from the keyboard to fill the
screen completely. The pattern shown in Figure 7-3 gives a good picture for making
CRT display adjustments.
With an oscilloscope, check that horizontal and vertical sync signals are
a nominal +4 volts peak-to-peak. Horizontal sync is available at pin 6, and verti-
cal sync at pin 9, of Pl12 (the plug connected to the edge connector of the Monitor
Deflection Board). Pins 1 and 10 of Pl12 are at ground.
NOTE: A significantly lower amplitude indicates a possible
problem in the Timing Control Card or the Video Card.