JVC AV-20F475 Service Manual page 23

4.8.5 VIDEO CIRCUIT
Measuring
Item
instrument
WHITE Signal
generator
BALANCE
(LOW LIGHT)
Remote
control unit
LOW LIGHT adjustment mode
SETTING ITEM
BRIGHT
R CUTOFF G CUTOFF B CUTOFF
SINGLE HORIZONTAL LINE
Setting item
S11: R CUT OFF
S12: G CUT OFF
S13: B CUT OFF
S01: BRIGHT
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]
BRIGHT
Initial setting value
30
30
30
64
Description
(1) Receive the black and white signal ( color off ).
(2) Set the VIDEO STATUS to STANDARD.
(3) Set the COLOR TEMPERATURE to LOW.
(4) Select the 1.V/C (S) from the SERVICE MODE.
(5) Set the initial setting value of < S11 > (R CUTOFF),
< S12 > (G CUTOFF), < S13 > (B CUTOFF) and <
S01 > (BRIGHT).
(6) Return to the main menu in the SERVICE MODE.
(7) Select the 7.LOW LIGHT from the SERVICE MODE.
(8) Display a single horizontal line by pressing the [1]
key.
(9) Turn the SCREEN VR all the way to the left.
(10) Turn the SCREEN VR gradually to the right from the
left until either one of the red, blue or green colors
appears faintly.
(11) Adjust the two colors which did not appear until the
single horizontal line that is displayed becomes
white using the [4]~[9] keys.
(12) Turn the SCREEN VR until the single horizontal line
is displayed faintly.
(13) Press the [2] key to cancel the single horizontal line
mode.
(14) Return to the main menu in the SERVICE MODE.
(15) Select the 1.V/C (S) from the SERVICE MODE.
(16) Adjust the BRIGHT level to become the black
component shines white slightly by < S01 >.
(17) Confirm that whether the color ingredient of R, G, or
B is visible to the black component, which shines
white slightly.
(18) When the color ingredient can be seen, two colors
other than a visible color are adjusted, and it is made
to look white.
(19) Return the value of < S01 > to initial setting value.
• The [3] (EXIT) key is the cancel key for the WHITE
BALANCE.
REMOTE CONTROL UNIT
H.LINE ON H.LINE OFF
R CUTOFF G CUTOFF
R CUTOFF G CUTOFF
EXIT
B CUTOFF
B CUTOFF
(No.YA052)1-23