JVC AV-28T5BK/P Service Manual page 29

Measuring
Item
instrument
V. S-SHAPE Signal
CORRECTION generator
&
V. LINEARITY Remote
control unit
4.8.4 VIDEO CIRCUIT
Measuring
Item
instrument
WHITE BALANCE Signal
generator
Remote
control unit
REMOTE CONTROL UNIT KEY
CUTOFF G
WDR G
CUTOFF R
WDR R
CUTOFF R
WDR R
SUB BRIGHT Remote
control unit
SUB CONTRAST Remote
control unit
Test point Adjustment part
[4.DEF]
12.V.S-CR
13.V.LIN
TOP
CENTRE
BOTTOM
Test point Adjustment part
[2. V/C]
2.CUTOFF R/G
3.WDR R/B
CUTOFF G
WDR G
1 2 3
4 5 6
WDR B
7 8 9
WDR B
[2. V/C]
4. BRIGHT
[2. V/C]
5. CONT.
Description
• When the vertical linearity has been deteriorated
remarkably, perform the following steps.
(1) Receive the cross hatch signal.
(2) Set the ZOOM mode to FULL.
(3) Select 4.DEF from the SERVICE MODE.
(4) Set the initial setting value of < 13.V.LIN >.
(5) Set the initial setting value of < 12.V.S-CR >.
(6) Adjust < 13.V.LIN > and < 12.V.S-CR > so that the
spaces of each line on top, centre and bottom
become uniform.
(7) Press the [MENU] key to memorize the set value.
Description
(1) Receive the black and white signal (colour off).
(2) Set the ZOOM mode to FULL.
(3) Set the PICTURE mode to STANDARD.
(4) Set the COLOUR TEMP. to NORMAL.
(5) Select 2.V/C from the SERVICE MODE.
(6) Select < 2.CUTOFF >.
(7) Each select (R), (G) and adjust the screen until the
black portion in the screen becomes black.
(8) Select < 3.WDR >.
(9) Each select (R), (B) and adjust the screen until the
white portion in the screen becomes white.
NOTE: Do not adjust < 3. WDR G >.
(10) Press the [MENU] key to memorize the set value.
(11) Change the contrast and brightness from low light
to high light and check that the tracking of the white
balance is good.
(1) Receive the any broadcast.
(2) Set the ZOOM mode to FULL.
(3) Set the PICTURE mode to STANDARD.
(4) Select 2.V/C from the SERVICE MODE.
(5) Set the initial setting value of < 4.BRIGHT >.
(6) If the brightness is not the best with the initial set-
ting value, make fine adjustment until you get the
best brightness.
(7) Press the [MENU] key to memorize the set value.
(1) Receive the any broadcast.
(2) Set the ZOOM mode to FULL.
(3) Set the PICTURE mode to STANDARD.
(4) Select 2.V/C from the SERVICE MODE.
(5) Set the initial setting value of < 5.CONT >.
(6) If the contrast is not the best with the initial setting
value, make fine adjustment until you get the best
contrast.
(7) Press the [MENU] key to memorize the set value.
(No.YA261)1-23