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3. White balance adjustment Purpose: Optimizing the white balance (back and white) for the image.
Adjustment jig
Color pattern generator
Meassuring location TV screen (visual observation)
Input signal
Studio color bar
170V 3.0
Earth 0V
The items "1. Preparatory adjustment" and "2. Sub-brightness
adjustment" must have been executed.
1. Set to the item [G-CUT] of the adjustment mode [WB
(WB adjustment) and switch the input selector to video or similar for
no input.
(In the following, the adjustment mode will be omitted in the
explanations.)
2. Press the remote control button " " and make the screen one
horizontal line.
For selection of a different adjustment item, press the button " "
again for cancellation.
3. Connect the oscilloscope probe to TPL7 of the picture tube board [L],
and adjust with the remote control buttons [VOL +/-] so that the
waveform level against earth becomes DC170V
the following figure.
4. Turn the screen volume gradually to the right and adjust so that
green just starts to shine.
5. Set to the item [R-CUT] of [WB
6. Adjust with the remote control buttons [VOL +/-] so that red becomes
as bright as green and yellow is obtained.
7. Set to the item [B-CUT] of [WB
8. Adjust with the remote control buttons [VOL +/-] so that blue
becomes as bright as green and white is obtained.
9. Turn the screen volume gradually to the left to where the three color
horizontal line disappears.
Press the remote control button " " to cancel the horizontal line.
11. Receive a studio color bar and either shift the fine adjustment of the
TV or use the chroma cut of the color pattern generator to obtain a
block-and-white screen.
If the screen is greenish, repeat the adjustment 4. to 10..
12. If the black-and-white screen is reddish, select the item [R-DRV] of
[WB
] (WB adjustment), and if it is bluish, select the item [B-
DRV], and then adjust with the remote control buttons [VOL +/-] so
that a normal black-and-white screen is obtained.
Adjust [R-DRV] and [B-DRV] alternately to obtain the best condition.
Confirmation
• Cancel the service maintenance mode.
• Select [
] (Black level) of the menu [
adjustment), change the level, and confirm that a normal black-and-
white screen is obtained. Also confirm the screen brightness for all
channels.
When the screenn is too bright (black floats) or too dark (black is
subdued), use the remote control buttons [VOL +/-] to adjust the
item [S-BRT] of [WB
When a normal screen is not obtained, repeat the adjustments 1.
to 12..
13. Return the item [
adjustment) to the recorded value.
If the TV fine adjustment has been shifted, return it to the original
setting.
- 24 -
3.0 as shown in
] (WB adjustment).
] (WB adjustment).
] (Image
] (WB adjustment).
] (Color darkness) of [
]
] (Sub-
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