12
Troubleshooting
1.2.6 Excess Luminance
START
ADJUST THE CONTRAST CONTROL
TO DETERMINE IF THE
CIRCLE−CROSSHATCH IMAGE
DISPLAY THE CIRCLE−
CROSSHATCH SCREEN
VARIES IN BRIGHTNESS
THE CONTRAST
NO
YES
ARE
DISCONNECT THE THREE VIDEO
INPUT CABLES FROM THE REAR
OF THE MONITOR
THE THREE
NO
REPLACE THE
POWER SUPPLY
BOARD (3.4)
VOLTAGES WITHIN
TOLERANCE
YES
REPLACE THE
H/J CONTROL
BLOCK (3.12)
IS THE
BACKGROUND
THE PROBLEM IS NOT
IN THE MONITOR.
REFER TO THE SYSTEM
DOCUMENTATION AND RUN
THE GRAPHIC DIAGNOSTICS
THE G2 CONTROL
REPLACE THE
A BOARD (3.7)
RECONNECT THE VIDEO CABLES
AND PERFORM THE A BOARD
NO
REPLACE
THE WHOLE
(2.3)
MONITOR
YES
STOP
SECTION NUMBERS ARE IN PARENTHESES.
DOES
CONTROL INCREASE AND
CHECK THE +12, −12,
AND +60 VOLT POINTS
ON THE B BOARD
DESCREASE THE
NO
YES
IS THE
RASTER DISPLAY
ON THE
SCREEN
S1 SWITCH
SET THE S1 SWITCH IN
THE CENTER POSITION.
SETTING S1 IN ANY OTHER
POSITION DISPLAYS
EXCESSIVE RASTER
ADJUSTMENTS
IMAGE
RASTER STILL VISIBLE
IN THE CENTER
NO
YES
NORMAL
IS THE
ADJUSTING
DOES
TURN DOWN THE
NO
YES
(NORMAL)
POSITION
RASTER