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LOW-LIGHT WHITE BALANCE ADJUSTMENT
Measuring Instruments Signal generator (Crosshatch signal, 10-step gray scale signal)
Oscilloscope
Card (Slot) Component/RGB Input Card (Slot 1)
Test Points TP-47B [CRT SOCKET PWB]
TP-GND [CRT SOCKET PWB]
Adjustment Points W*04 (Cut Off (R)), W*05 (Cut Off (G)), W*06 (Cut Off (B)) [Service Menu]
Notes: • Perform the following adjustments after completing the
screen size adjustment.
• Set the COLOR TEMP./BAL. data in the Setup Menu to
“00”.
1. Apply the 1080/60i component crosshatch signals to INPUT A.
2. Set COLOR TEMP. of “COLOR TEMP./BAL.” in the Setup Menu to
HIGH.
3. Set the PHASE, CHROMA, BRIGHT and CONTRAST
potentiometers on the front panel to the center click positions.
4. Connect the oscilloscope across TP-47B and TP-GND.
5.
Ensure that the
AKB pulse voltage <A> of the waveform at TP-47B
is 15 V ± 2 V. If it is not, adjust it with the SCREEN VR potentiometer.
6. Apply the 1080/60i component 10-step gray scale signal to INPUT
A.
7. Turn the BRIGHT potentiometer on the front panel gradually until
the second gray step in the gray scale lights slightly. (Do not touch
the SCREEN VR potentiometer.)
8. Adjust WO04, WO05 and WO06 in the Service Menu so that the
gray bars are not tinted. (Do not set the values of WO04 to WO06
no more than “50”.)
9. Write the data of WO04 to WO06 in WP04 to WP06 without any
alteration. (Do not adjust the WP items.)
LOW-LIGHT WHITE BALANCE ADJUSTMENT
1 Vertical interval
(V. sync)
AKB Pulse
V. BLK
<A>
15V ± 2V
Let this bar light up slightly
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