JVC HD-52Z585 Service Manual page 31

4.7.2 VIDEO CIRCUIT
Measuring
Item
instrument
525i Signal
A-D OFFSET generator
adjustment
Remote
control unit
Disappears the color at both ends.
1125i Signal
BRIGHTNESS generator
adjustment
Remote
control unit
Adjust the white area of 0% part largest.
<AD offset adjustment mode>
Test point Adjustment part
[1. ADJUST]
S001: PREPARE
S008: 5i CB OF
(525i Cb offset)
S009: 5i CR OF
(525i Cr offset)
[1. ADJUST]
S001:PREPARE
S012:HD BL
(1125i brightness)
S030:R DRIVE
(Red drive)
S031:G DRIVE
(Green drive)
S032:B DRIVE
(Blue drive)
Description
(1) Input a 525i ramp pattern from COMPONENT
VIDEO INPUT terminal.
(2) Set VIDEO STATUS to [STANDARD].
(3) Set ASPECT to [FULL].
(4) Set COLOR TEMPERATURE to [LOW].
(5) Select [1.ADJUST] from the SERVICE MENU.
(6) Adjust < S001 >(PREPARE) from 000 to 008, goes
into the [525i Cb offset] adjustment setting mode.
(7) Adjust < S008 > (525i Cb offset) and < S009 > (525i
Cr offset) to sets the lose gap (red line, green line
and blue line) which disappears the colors at both
ends of the center screen.
(8) Press the [MUTING] key to memorized the set
value.
(9) Repeat from (6) and (7), then check to see that both
ends color to white.
(10) Adjust < S001 > from 008 to 000, it change
to the normal mode.
(1) Input a 1125i gray scale pattern from COMPONENT
VIDEO INPUT terminal.
(2) Set VIDEO STATUS to [STANDARD].
(3) Set ASPECT to [FULL].
(4) Set COLOR TEMPERATURE to [LOW].
(5) Select [1.ADJUST] from the SERVICE MENU.
(6) Adjust < S030 > (Red drive), < S031 > (Green drive)
and < S032 > (Blue drive) to set the values [128].
(7) Adjust < S001 > (PREPARE) from 000 to 012,
it goes to [A/D offset] adjustment mode.
(8) Adjust < S012 > (HDBL) to set the 0% black part in
the upper half of the screen to be largest.
(9) Press the [MUTING] key to memorized the set
value.
(10) Adjust < S001 > from 012 to 000, it change
to the normal mode.
(No.YA092B)1-31