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– 5 –
8
Adjust the Increment Button (+) or Decrement Button (–)
so that the screen is set to the horizontal center position.
8
Repeat above adjustment until they are satisfied.
(6). Character Size Adjustment
Test Point:
Emitter of Q118
Adjust:
MENU SIZE
Increment Button (+)
Decrement Button (–)
8
Supply the Colour Bar signal to the Video Input
Connector.
8
Connect CH1 of the Oscilloscope to the Emitter of Q118.
8
Connect CH2 of the Oscilloscope to the Video Output
Connector.
8
Select the MENU Button to the DEF MENU.
8
Select the Cursor Buttons (
i
) or (
o
) to the MENU SIZE
position.
8
Adjust the Increment Button (+) or Decrement Button (–)
so that the H-scan time becomes 44 ± 0.5 µs as shown in
Fig. 4-4.
Fig. 4-4
(7). Audio Maximum Output Power Setting
Adjust:
MAX AUDIO
Increment Button (+)
Decrement Button (–)
Observe:
Audio Analyzer
8
Set the Selector (Audio Out or Speaker Out ) SW1 to the
Speaker Out position.
8
Set the Output Level of the Audio Analyzer to -14±0.3
dBV, 1 kHz ± 3 %.
8
Select the MENU Button to the SUB MENU.
8
Select the Cursor Buttons (
i
) or (
o
) to the MAX AUDIO
position.
8
Observing the Audio Analyzer, adjust the Increment
Button (+) or Decrement Button (–) so that the output level
becomes 5. 2± 0.2 dBV.
(8). Screen Cut off Fine Adjustment
Test Point:
TP802 (G)
CRT Board
Adjust:
STD BRIGHT
Increment Button (+)
Decrement Button (–)
CUTOFF G
Increment Button (+)
Decrement Button (–)
SCREEN Control
Flyback Transformer on the Main Board
8
Supply the Grayscale signal to the Video Input Connector.
8
Connect the Oscilloscope to TP802.
8
Set the Input Selector of the Oscilloscope to the DC mode.
8
Select the Cursor Buttons (
i
) or (
o
) to the STD BRIGHT
position.
8
Adjust the Increment Button (+) or Decrement Button (–)
so that the STD BRIGHT becomes 70.
8
Select the MENU Button to the W/B MENU.
8
Select the Cursor Buttons (
i
) or (
o
) to the CUTOFF G
position.
8
Adjust the Increment Button (+) or Decrement Button (–)
so that the G Pedestal becomes to 110 ± 2 V as shown in
Fig. 4-5.
Fig. 4-5
8
Adjust the SCREEN control so that the 8th step of the stair
step becomes cut off.
(9). White Balance Coarse Adjustment
Adjust:
CUTOFF R
Increment Button (+)
Decrement Button (–)
CUTOFF B
Increment Button (+)
Decrement Button (–)
DRIVE R
Increment Button (+)
Decrement Button (–)
DRIVE B
Increment Button (+)
Decrement Button (–)
Observe:
Colour Video Monitor
8
Select the Cursor Buttons (
i
) or (
o
) to the CUTOFF R,
CUTOFF B, DRIVE R or DRIVE B position.
8
Adjust the Increment Button (+) or Decrement Button (–)
so that the 2nd step and the 7th step of the stair step
become white.
44.0
±
0.5
µ
s
H
CH1
CH2
110
±
0.2 V
GND
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