JVC LT-32C50BU Service Manual page 21

4.7 ADJUSTMENT PROCEDURE
4.7.1 VIDEO CIRCUIT
Measuring
Item
instrument
625i Remote
A-D OFFSET control unit
Signal
generator
Disappears the color at both ends.
1125i (50Hz) Remote
BRIGHTNESS control unit
Signal
generator
Set the 0% black part to be brightest.
1125i (50Hz) Remote
A-D OFFSET control unit
Signal
generator
Minimize the red and blue noises in
the upper half of the screen.
Test point Adjustment part
[1.ADJUST]
S001: PREPARE
(Adjustment setting mode change)
S008: 5i CB OF(625i cb offset)
S009: 5i CR OF(625i cr offset)
S030: R DRIVE(Red drive)
S031: G DRIVE(Green drive)
S032: B DRIVE(Blue drive)
[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.ADJUST]
S001: PREPARE
(Adjustment setting mode change)
S013: HD CB OF(1125i cb offset)
S014: HD CR OF(1125i cr offset)
S030: R DRIVE(Red drive)
S031: G DRIVE(Green drive)
S032: B DRIVE(Blue drive)
Description
(1) Receive a 625i component ramp pattern signal.
(2) Set "PICTURE MODE" to STANDARD.
(3) Set "ZOOM" to FULL.
(4) Set "COLOUR TEMP." to NORMAL.
(5) Select "1.ADJUST" from the SERVICE MODE.
(6) Set < S030 > (R DRIVE), < S031> (G DRIVE)
and < S032 > (B DRIVE) to "128".
(7) Set < S001 >(adjustment setting mode change)
to set "8" 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 centre 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.
(1) Receive a 1125i (50Hz) gray scale pattern signal.
(2) Set "PICTURE MODE" to STANDARD.
(3) Set "ZOOM" to FULL.
(4) Set "COLOUR TEMP." to NORMAL.
(5) Select "1.ADJUST" from the SERVICE MODE.
(6) Set < S030 > (R DRIVE), < S031> (G DRIVE)
and < S032 > (B DRIVE) to "128".
(7) Set < S001 > (adjustment setting mode change)
to set the values "12" 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.
(1) Receive a 1125i (50Hz) 30% all white pattern
signal.
(2) Set "PICTURE MODE" to STANDARD.
(3) Set "ZOOM" to FULL.
(4) Set "COLOUR TEMP." to NORMAL.
(5) Select "1.ADJUST" from the SERVICE MODE.
(6) Set < S030 > (R DRIVE), < S031> (G DRIVE)
and < S032 > (B DRIVE) to "128".
(7) Set < S001 > (adjustment setting mode change)
to set "13" and it change to the 1125i A-D offset
adjustment setting mode.
(8) Set < S013 > (1125i Cb offset) to minimize the
blue noise in the upper half of the screen.
(9) Set < S014 > (1125i Cr offset) to minimize the
blue noise in the upper half of the screen.
(10) Set < S001 > to set "000" and it change to the
normal mode.
(11) Press the [MUTING] key to memoirze the set
value.
(No.YA204)1-21