JVC AV-27FA44/BSA Service Manual page 77

4.7.5 VIDEO CIRCUIT
Measuring
Item
instrument
WHITE Signal
BALANCE generator
(Low Light)
Remote
control unit
LOW LIGHT adjustment mode
SETTING ITEM
BRIGHT
R CUTOFF
SINGLE HORIZONTAL LINE
Adjustment item
S11: R CUT OFF
S12: G CUT OFF
S13: B CUT OFF
S01: BRIGHT
1-32 (No.52114)
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]
SETTING VALUE
G CUTOFF B CUTOFF
SETTING VALUE
Initial setting value
30
30
30
64
Description
(1) Receive the black and white signal ( color off ).
(2) Enter the SERVICE MENU.
(3) Select the 1.V/C (S).
(4) Confirm the initial setting value of < S11 > (R
CUTOFF), < S12 > (G CUTOFF), < S13 > (B
CUTOFF) and < S01 > (BRIGHT).
(5) Return the SERVICE MENU and select the 7.LOW
LIGHT.
(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] ~ [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) Adjust the BRIGHT level to become the black
component shines white slightly.
(13) Confirm that whether the color ingredient of R, G, or
B is visible to the black component, which shines
white slightly.
(14) When the color ingredient can be seen, two colors
other than a visible color are adjusted, and it is made
to look white.
(15) 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