Akai 21CTU93BC Service Manual Page 12

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production doesn't need to carry on M 3~ adjustments of M9.
In "M0"~under"M9" appearance press” CALL” the key can get into "M" appearance.
At “M”under the appearance press “-/-“ the key can get into “BUS OPEN” appearance, at “BUS OPEN under,
press “-/-“ the key recover factory appearance.
Remote Hand Unit keys
[M1] [M2] [M3]
[M0]
[M1] menu
MENU0 Geometrical adjustment
Receive PAL standard Complete pattern signal.
Adjustment steps
a) Adjust V. SLOPE, to the center horizontal line just appeare from half bottom shadow.
b) Adjust V. SIZE, to get 90% of vertical picture contents would be displayed on CRT.
c) Adjust V. SHIFT, the center horizontal line correspond to CRT vertical center.
d) Adjust H.SHIFT, to get the picture horizontal center correspond to CRT horizontal center.
Receive NTSC signal and repeat above [M0] and [M1] adjustment.
[M2] Menu
AGC Adjustment.
Receive 60dB
μ
(1mV)V
H
colour bar pattern signal
adjust AGC value
voltage from high to low
),
to noise
reduce gradually and just disappeared point.
Select “shipping”, push [V+] [V-]key to be shipped.
[M3] Menu
CRTcut off and white balance adjustment.
Receive white signal.
a) CRT cut off adjustment.
1. Select “SC”, then automatically vertical scan will be stopped.
2. Adjust SCREEN control on Flyback transformer to get the darkest single horizontal line (red,
green, or blue, sometimes shows more yellow, more purple or more white).
b) White balance adjustment.
1. Select RD/BD menu.
2. Adjust RD/BD to get colour temperature as x=281, y=311
c) Sub-Brightness adjustment. (Use stair case signal)
1. Select SB menu.
2. Adjust SB to get the darkest step being cutoff.
b
c d e
i
j k
f g h
Horizontal line
Shado
a
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