JVC AV-27F476 Service Manual page 25

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
WHITE Signal
BALANCE generator
(HIGH LIGHT)
Remote
control unit
REMOTE CONTROL UNIT
R DRIVE
R DRIVE
SUB BRIGHT Remote
control unit
Test point Adjustment part
[1.V/C (S)]
S01: BRIGHT
S11: R CUTOFF
S12: G CUTOFF
S13: B CUTOFF
[7.LOW LIGHT]
SCREEN VR
EXIT [in HVT]
B CUTOFF
B CUTOFF
[1.V/C (S)]
S14: R DRIVE
S15: B DRIVE
[8.HIGH LIHGT]
EXIT
B DRIVE
B DRIVE
[1.V/C (S)]
S01: BRIGHT
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.
(1) Receive the black and white signal (color off).
(2) Select the 1.V/C (S) from the SERVICE MODE.
(3) Set the initial setting value of < S14 > (R DRIVE) and
< S15 > (B DRIVE).
(4) Return to the main menu in SERVICE MODE.
(5) Select the 8.HIGH LIGHT from the SERVICE
MODE.
(6) Adjust the screen until it becomes white using the
[4], [6], [7] and [9] keys.
• The [3] (EXIT) key is the cancel key for the WHITE
BALANCE.
(1) Receive any broadcast.
(2) Select the 1.V/C (S) from the SERVICE MODE.
(3) Select < S01 > (BRIGHT).
(4) Set the initial setting value of < S01 >.
(5) If the brightness is not the best with the initial setting
value, make fine adjustment of < S01 > until you get
the optimum brightness.
(No.YA243)1-25