JVC AV-29QT4SU Service Manual page 16

Measuring
Item
instrument
TRAPEZIUM Signal
adjustment generator
Remote
control unit
SIDE PIN Signal
adjustment generator
Remote
control unit
CORNER Signal
adjustment generator
Remote
control unit
Straight
1-16 (No.YA085C)
Test point Adjustment part
021 TRAPEZ
Parallel
020 EW PARAB
Straight
022 UC PARAB
023 LC PARAB
Straight
Description
(1) Receive a crosshatch signal.
(2) Enter the SERVICE MODE.
(3) Select TRAPEZ.
(4) Adjust TRAPEZ until vertical lines, especially lines at
the sides of the picture frame become parallel to the
both sides of picture tubes as close as possible.
(5) Check and readjust TRAPEZ 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 EW PARAB.
(4) Adjust EW PARAB until vertical lines close to the
both sides of the picture frame become straight to
vertical sides of picture tube without any bending to
left or to right side of the screen.
(5) Check and readjust EW PARAB 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 UC PARAB.
(4) Adjust UC PARAB until vertical lines at the upper
corners of the picture frame become vertical and
parallel to vertical corner sides of picture tube.
(5) Check and readjust UC PARAB item if the
adjustment becomes improper after some other
geometric adjustments are done.
(6) Select LC PARAB.
(7) Adjust LC PARAB until vertical lines at the lower
corners of the picture frame become vertical and
parallel to vertical corner sides of picture tube.
(8) Check and readjust LC PARAB item if the
adjustment becomes improper after some other
geometric adjustments are done.