JVC AV-28ED5BN, AV-28ED5SN, Service Manual

Page: 13 / 20

(No.YA316)1-13
4.6.4 DEFLECTION CIRCUIT ADJUSTMENT
Item
Measuring
instrument
Test point Adjustment part Description
VERTICAL
SHIFT
adjustment Signal
generator
Remote
control unit
V-SHIFT (1) Receive a circle pattern signal.
(2) Enter the SERVICE MODE.
(3) Press the [
RED ] key to enter the H/V adjustment
group.
(4) Select V-SHIFT .
(5) Adjust V-SHIFT to make A=B .
(6) Check and readjust V-SHIFT item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Press the [ INFORMATION ] key to memorize the set
value.
VERTICAL
SIZE
adjustment Signal
generator
Remote
control unit
V-SIZE (1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Press the [
RED ] key to enter the H/V adjustment
group.
(4) Select V-SIZE .
(5) Adjust V-SIZE 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.
(6) Check and readjust V-SIZE item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Press the [ INFORMATION ] key to memorize the set
value.
VERTICAL
S-CORRECTION
& LINEARITY
adjustment Signal
generator
Remote
control unit
S-COR
LINRT
(1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Press the [
RED ] key to enter the H/V adjustment
group.
(4) Select S-COR .
(5) Adjust S-COR 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.
(6) Check and readjust S-COR item if the adjustment
becomes improper after some other geometric
adjustments are done.
(7) Press the [ INFORMATION ] key to memorize the set
value.
(8) Select LINRT .
(9) Adjust LINRT 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.
(10) Check and readjust LINRT item if the adjustment
becomes improper after some other geometric
adjustments (especially after than S-COR
adjustment) are done.
(11) Press the [ INFORMATION ] key to memorize the set
value.
A
B
Screen
size
Very close
Very close
Picture
size
100%
UPPER
CENTRE
LOWER