JVC I'Art AV-27CF36 Service Manual page 25

Measuring
Item
instrument
H. SIZE / Signal
H. POSITION / generator
SIDE PIN
Remote
control unit
Screen size 90%
Picture size 100%
4.8.4 VIDEO CIRCUIT
Measuring
Item
instrument
WHITE Signal
BALANCE generator
(LOW LIGHT)
Remote
control unit
REMOTE CONTROL UNIT
H.LINE ON H.LINE OFF
R CUTOFF G CUTOFF
R CUTOFF G CUTOFF
Test point Adjustment part
[2.DEF (D)]
D03: H POSI
D15: H SIZE
D23: EW PARA
D19: EWCR TOP
D21: EWCR BTM
Test point Adjustment part
[1.V/C (S)]
S01: BRIGHT
S11: R CUTOFF
S12: G CUTOFF
S13: B CUTOFF
[7.LOW LIGHT]
SCREEN VR
[in HVT]
EXIT
B CUTOFF
B CUTOFF
Description
(1) Receive the crosshatch signal.
(2) Select 2.DEF(D) from the SERVICE MODE.
(3) Select < D03 > (H POSI).
(4) Adjust < D03 > to the left width and right width of the
crosshatch screen becomes equal.
(5) Select < D15 > (H SIZE).
(6) Adjust < D15 > to the horizontal screen size become
setting value is 90%.
(7) Select < D23 > (EW PARA).
(8) Adjust < D23 > to vertical line at both side to become
straight.
(9) If it is necessary, readjust step 3 to 8.
NOTE:
If it is not straight at the vertical upper and bottom corner
line, adjust the upper and bottom conrner pin by < D19 >
(EWCR TOP) amd < D21 > (EWCR BTM).
Description
(1) Receive the black and white signal ( color off ).
(2) Select the 1.V/C (S) from the SERVICE MODE.
(3) Confirm the initial setting value of < S11 > (R
CUTOFF), < S12 > (G CUTOFF), < S13 > (B
CUTOFF) and < S01 > (BRIGHT).
(4) Return to the main menu in SERVICE MODE.
(5) Select the 7.LOW LIGHT from the SERVICE MODE.
(6) Display a single horizontal line by pressing the [1]
key.
(7) Turn the SCREEN VR all the way to the left.
(8) Turn the SCREEN VR gradually to the right from the
left until either one of the red, blue or green colors
appears faintly.
(9) Adjust the two colors which did not appear until the
single horizontal line that is displayed becomes
white using the [4] to [9] keys.
(10) Turn the SCREEN VR until the single horizontal line
is displayed faintly.
(11) Press the [2] key to cancel the single horizontal line
mode.
(12) Return to the main menu in SERVICE MODE.
(13) Select the 1.V/C (S) from the SERVICE MODE.
(14) Adjust the BRIGHT level to become the black
component shines white slightly by < S01 >.
(15) Confirm that whether the color ingredient of R, G, or
B is visible to the black component, which shines
white slightly.
(16) When the color ingredient can be seen, two colors
other than a visible color are adjusted, and it is made
to look white.
(17) Return the value of < S01 > to initial setting value.
• The [3] (EXIT) key is the cancel key for the WHITE
BALANCE.
(No.YA257)1-25