JVC LT-26X575/KA, Service Manual

Page: 22 / 130

1-22 (No.YA179)
4.7 ADJUSTMENT PROCEDURE
4.7.1 VIDEO CIRCUIT
Item
Measuring
instrument
Test point Adjustment part Description
525i
A-D OFFSET Remote
control unit
Signal
generator
[1.ADJUST]
S001: PREPARE
(Adjustment setting mode change)
S008: 5i CB OF(525i cb offset)
S009: 5i CR OF(525i cr offset)
S030: R DRIVE(Red drive)
S031: G DRIVE(Green drive)
S032: B DRIVE(Blue drive)
(1) Receive a 525i component ramp pattern signal.
(2) Set “VIDEO STATUS” to STANDARD.
(3) Set “ASPECT” to FULL.
(4) St "COLOR TEMPERATURE" to LOW.
(5) Select "1.ADJUST" from the SERVICE MODE.
(6) Set < S030 > (R DRIVE), < S031> (G DRIVE)
and < S032 > (B DRIVE) to "255".
(7) Set < S001 >(adjustment setting mode change)
to set "008" and it change to the 525i A-D offset
adjustment setting mode.
(8) Set < S008 > (525i Cb offset) and < S09 > (525i
Cr offset) to lose the gap (red line, green line
and blue line) which appears at both ends of a
white part at the center of the screen.
(9) Set < S001 > to set “000“ and it change to the
normal mode.
(10) Press the [MUTING] key to memoirze the set
value.
1125i
BRIGHTNESS Remote
control unit
Signal
generator
[1.ADJUST]
S001: PREPARE
(Adjustment setting mode change)
S012: HD BL(1125i brightness)
S030: R DRIVE(Red drive)
S031: G DRIVE(Green drive)
S032: B DRIVE(Blue drive)
(1) Receive a 1125i gray scale pattern signal .
(2) Set “VIDEO STATUS” to STANDARD.
(3) Set “ASPECT” to FULL.
(4) Set "COLOR TEMPERATURE" to LOW.
(5) Select "1.ADJUST" from the SERVICE MODE.
(6) Set < S030 > (R DRIVE), < S031> (G DRIVE)
and < S032 > (B DRIVE) to "255".
(7) Set < S001 > (adjustment setting mode change)
to set the values “012“ and it change to the
1125i black level adjustment setting mode.
(8) Set < S012 > (1125i brightness) to set the 0%
black part in the upper half of the screen to be
brightest.
(9) Set < S001 > to set “000“ and it change to the
normal mode.
(10) Press the [MUTING] key to memoirze the set
value.
Disappears the color at both ends.
Set the 0% black part to be brightest.