JVC AV-29QT4SU Service Manual page 14

4.7.3 DEFLECTION CIRCUIT ADJUSTMENT
Measuring
Item
instrument
VERTICAL Signal
SHIFT generator
adjustment
Remote
control unit
VERTICAL Signal
SIZE generator
adjustment
Remote
control unit
Very close
Screen
size
Very close
VERTICAL Signal
S-CORRECTION generator
& LINEARITY
adjustment Remote
control unit
1-14 (No.YA085C)
Test point Adjustment part
013 VERT SHIFT
A
B
014 VERT AMP
Picture
size
100%
015 SCORRECTION
017 V-LINEARITY
UPPER
CENTRE
LOWER
Description
(1) Receive a circle pattern signal.
(2) Enter the SERVICE MODE.
(3) Select VERT SHIFT.
(4) Adjust VERT SHIFT to make A=B.
(5) Check and readjust VERT SHIFT item if the
adjustment becomes improper after some other
geometric adjustments are done.
(1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Select VERT AMP.
(4) Adjust VERT AMP until horizontal black lines on
both the upper and lower part of the crosshatch
pattern become very close to the upper and lower
horizontal sides of picture size and nearly about to
disappear.
(5) Check and readjust VERT AMP item if the
adjustment becomes improper after some other
geometric adjustments are done.
(1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Select SCORRECTION.
(4) Adjust SCORRECTION until the size of squares on
both the upper and lower part of crosshatch pattern
become equal to the squares laying on the vertical
centre of the crosshatch pattern.
(5) Check and readjust SCORRECTION item if the
adjustment becomes improper after some other
geometric adjustments are done.
(6) Select V-LINEARITY.
(7) Adjust V-LINEARITY until all the size of squares of
the crosshatch pattern become in equal size from
the top of the screen to its bottom of the whole
screen.
(8) Check and readjust V-LINEARITY item if the
adjustment becomes improper after some other
geometric adjustments
SCORRECTION adjustment) are done.
(especially after than