JVC PD-50X795 Service Manual page 35

4.7.3 VIDEO CIRCUIT [RECEIVER UNIT]
Measuring
Item
instrument
525i Remote
A-D OFFSET control unit
Signal
generator
Disappears the color at both ends.
1125i Remote
BRIGHTNESS control unit
Signal
generator
Set the 0% black part to be brightest.
1125i 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(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.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 525i component ramp 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 "133".
(7) Set < S001 >(adjustment setting mode change)
to set "008" and it change to the 525i A-D offset
adjustment setting mode.
(8) Adjust < S008 > (525i Cb offset) and < S009 >
(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.
(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 "133".
(7) Set < S001 > (adjustment setting mode change)
to set the values "012" and it change to the
1125i brightness adjustment setting mode.
(8) Adjust < 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 30% all white 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 "133".
(7) Set < S001 > (adjustment setting mode change)
to set "013" 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
red 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.YA100)1-35