4-L I White Balance Adjustment; Sub Black Level Adjustment; Agc Adjustment For Sub Video (Except 36Cx35Bkz73) - Hitachi 36UX52B\CZ77 Service Manual

M7LXU
4-11 White Balance Adjustment
Adjustment Preparation
(1) Apply heat-run IO minutes or more after the
power is turned on.
(2) Check that the purity adjustment has been com-
pleted.
(3) Set the vertical incident illumination on the CPT
surface to 20 lux or less.
(4) Receive white raster signal.
(5) Set the color temperature control (white control)
to cool.
(6) Set data of PO9 and PI0 to D128.
(7) Turn the screen adjusting VR fully counterclock-
wise.
(8) Set cut-off mode (see item 4-9).
Adjustment Procedure
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Turn the screen adjusting VR clockwise and set it
to the position where the bright colored line starts
appearing on CPT screen.
Do not change the cut-off data (this data is
named "CODE-A") corresponding to the color
first appearing.
Turn the screen fully clockwise adjusting VR
when a bright co/or line does not appear.
Adjust the cut-off data except Code-A so that the
red, green and blue bright colored line appear
on the screen equally by using "4,) ,A,v"
keys.
Set to normal mode by pressing "ENTER" key.
Change G and B data ("PO9 and PlO") by using
"4 ,)I' keys and adjust the high-brightness white
balance.
Adjust picture control to minimum and check that
the low-brightness white balance is obtained by
directly observing the low-brightness without
using a mirror.
When the low brightness white balance is not
obtained, adjust other low-brightness white bal-
ance code except Code-A and return to item (6).
White balance color temperature setting 9,300"K
Set white control (color temperature control) to
warm, and check that color temperature is
approx. 7,200"K
Adjustment
Code
R cut off
PO6
G cut off
PO7
B cut off
PO8
4-12 SUB-BLACK LEVEL ADJUSTMENT
Adiustment Preparation
(1) Apply heat-run for IO min. or more after the
power is turned on.
(2) Receive color bar signal.
(3) Set CONTRAST and color controls to min.
(4) Set the vertical incident illumination on the CPT
surface to 20 lux or less.
(5) Set BRIGHTNESS control to the center position.
(6) Set white control to WARM.
(7) Select adjustment code "Pll."
Adiustment Procedure
(1) Adjust "PI 1" data by using " 4 F " keys. The
backgrounds of Al, A2 are set to black and A3 is
set to lighter black.
The background is set to black,
perform the adjustment without
observing the boundary parts.
D
Ql
II WiOO% 1 ELK
The background is set to
lighter black.
(2) Check by directly observing the CPT surface,
without using a mirror.
4-13 AGC ADJUSTMENT FOR SUB-VIDEO
(except for 36CX35B/CZ73)
Adjustment Preparation
(1)
(2)
(3)
(4
(5)
(6)
After all the adjustments are finished, heat-run 5
minutes or more in signal receiving condition.
Receive circle pattern signal (for sub-VIDEO).
Set CONTRAST to maximum, and BRIGHTNESS
to on-screen display center.
Antenna Input power: -53dBm (-53dBm--53dBm)
Connect DC voltmeter of internal resistance 1 M&J
or more to R114, (U102 Pin a)
Set adjustment code "PO2."
Adjustment Procedure
(1) Adjust "PO2" data until the indication of DC volt-
meter does not change any more at the maxi-
mum point. The reading of DC voltmeter is
named Vl. Adjust "PO2" data so that the indica-
tion of DC voltmeter is {VI-(0.5+0.2)}V.
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