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JVC AV-28H4BU Service Manual page 28

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Measuring
Item
instrument
TRAPEZIUM
Signal
generator
Remote
control unit
CORNER
Signal
generator
Remote
control unit
Straight
ANGLE
Signal
generator
Remote
control unit
1-28 (No.YA063)
Test point
Adjustment part
[4.DEF]
5.TRAPEZ
Parallel
[4.DEF]
7.COR-UP
8.COR-LO
9.COR-UP-S
10.COR-LO-S
Straight
[4.DEF]
11. ANGLE
Bring the vertical lines straight.
Description
(1) Receive the cross-hatch signal.
(2) Set the ZOOM mode to FULL.
(3) Select 4.DEF from the SERVICE MENU.
(4) Select < 5.TRAPEZ >.
(5) Set the initial setting value of < 5.TRAPEZ >.
(6) Adjust to bring the vertical lines at the right and left
edges of the screen parallel.
(7) Press the [MENU] key and memorize the set value.
(1) Receive the cross-hatch signal.
(2) Set the ZOOM mode to FULL.
(3) Select 4.DEF from the SERVICE MENU.
(4) Select < 7.COR-UP >.
(5) Set the initial setting value of < 7.COR.-UP >.
(6) Adjust to bring the straight line at the upper corner.
(7) Select < 8.COR-LO >.
(8) Set the initial setting value of < 8.COR-LO >.
(9) Adjust to bring the straight line at the low corner.
(10) Press the [MENU] key and memorize the set value.
(11) If the extreame upper & lower corners are a little pin
or barrel chose < 9.COR-UP-S > or < 10. COR-LO-
S > and adjust.
(12) Press the [MENU] key and memorize the set value.
• In case where there is a parallelogrammical distortion of
images on the screen.
(1) Receive the cross-hatch signal.
(2) Set the ZOOM mode to FULL.
(3) Select 4.DEF from the SERVICE MENU.
(4) Select < 11.ANGLE >.
(5) Set the initial setting value of < 11. ANGLE >.
(6) Adjust to bring the vertical lines straight.
(7) Press the [MENU] key and memorize the set value.

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