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4. Adjustment Procedure
8
Refer to the Location of Test Points and Adjusting
Controls on the page 10.
(1). 120V Adjustment
Test Point:
TP901 (120V)
Main Board
Adjust:
Increment Button (+)
Front Panel
Decrement Button (–)
Front Panel
8
Turn on the power while pressing the Increment Button
(+), the Decrement Button (–) and the Menu Button
(MENU) simultaneously, and enter to the Service Mode.
8
Supply the Grayscale signal to Video Input Connector.
8
Adjust the SCREEN control so that the stair steps become
visibly certain.
8
Enter to the DEF MENU by pressing the Menu Button
(MENU).
8
Select +B by pressing the Direction Button (
C
or
D
).
8
Connect the Digital Multimeter to TP901.
8
Adjust +B by pressing the Increment Button (+) or the
Decrement Button (–) so that the DC voltage at TP901
becomes 120 V ± 0.5 V.
(2). Screen Cut off Coarse Adjustment
Test Point:
TP802 (G)
CRT Socket Board
Adjust:
Increment Button (+)
Front Panel
Decrement Button (–)
Front Panel
SCREEN Control of Flyback Transformer
Main Board
8
Supply the Grayscale signal to Video Input Connector.
8
Enter to the SUB MENU by pressing the Menu Button
(MENU).
8
Select STD BRIGHT by pressing the Direction Button (
C
or
D
).
8
Connect the Oscilloscope to TP802.
8
Set the Input Selector of the Oscilloscope to the DC Mode.
8
Adjust STD BRIGHT by pressing the Increment Button (+)
or the Decrement Button (–) so that G Pedestal becomes
135 V ± 2 V as shown in Fig. 4-1.
Fig. 4-1
8
Adjust the SCREEN control so that only the 8th step of
stair steps becomes cut off.
(3). Contrast Adjustment
Test Point:
TP802 (G)
CRT Socket Board
Adjust:
Increment Button (+)
Front Panel
Decrement Button (–)
Front Panel
8
Supply the Grayscale signal to the Video Input Connector.
8
Enter to the SUB MENU by pressing the Menu Button
(MENU).
8
Select STD BRIGHT by pressing the Direction Button (
C
or
D
).
8
Note the current value of STD BRIGHT, and set STD
BRIGHT to 0 by pressing the Increment Button (+) or the
Decrement Button (–).
8
Select MAX CONTRAST by pressing the Direction Button
(
C
or
D
).
8
Connect the Oscilloscope to TP802.
8
Set the Input Selector of the Oscilloscope to the AC Mode.
8
Adjust MAX CONTRAST by pressing the Increment
Button (+) or the Decrement Button (–) so that the output
of TP802 becomes 70 V ± 3 V[p-p] as shown in Fig. 4-2.
Fig. 4-2
8
Select the STD BRIGHT item by pressing the Direction
Button (
C
or
D
).
8
Set STD BRIGHT to the noted value.
(4). Centering and Size Coarse Adjustment
Adjust:
Increment Button (+)
Front Panel
Decrement Button (–)
Front Panel
Observe:
Video Monitor Screen
8
Supply the Monoscope Pattern signal to the Video Input
Connector.
8
Enter to the DEF MENU by pressing the Menu Button
(MENU).
8
Select H CENTER by pressing the Direction Button (
C
or
D
).
8
Adjust H CENTER by pressing the Increment Button (+) or
the Decrement Button (–) so that the screen is set to the
horizontal center position.
8
Select H SIZE by pressing the Direction Button (
C
or
D
).
8
Adjust H SIZE by pressing the Increment Button (+) or the
Decrement Button (–) so that the full horizontal width
becomes approx. 8 % overscanning.
70 V
±
3 V[p-p]
135 V
±
2 V
GND
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