JVC AV-21Q3/D Schematic Diagrams page 33

VIDEO / CHROMA CIRCUIT ADJUSTMENT
The setting (adjustment) using the REMOTE CONTROL UNIT is made on the basis of the initial setting values.
The setting values which adjust the screen to the optimum condition can be different from the initial setting values.
Do not change the initial setting values of the setting items not listed in "ADJUSTMENT".
Measuring
Item
instrument
Signal
Adjustment
generator
of WHITE
BALANCE
Remote
(Low light) control unit
V/C
1. CUTOFF
50Hz
/ :SELECT
- / + : OPERATE
KEY ASSIGNMENT OF REMOTE CONTROL UNIT
CUTOFF OFF
(H.LINE OFF)
1
CUTOFF ON
(H.LINE ON)
4
R. CUTOFF( )
▲
R. DRIVE( )
▲
7
R. CUTOFF( )
▼
R. DRIVE( )
▼
R
Signal
Adjustment
generator
of WHITE
BALANCE
Remote
(High light) control unit
V/C
2. DRIVE
50Hz
/ :SELECT
- / + : OPERATE
Test point Adjustment part
1. CUT OFF (R)
CUT OFF (G)
CUT OFF (B)
SCREEN VR
[IN HVT]
PAL
(R) * **
(G) * **
(B) * **
DISP : EXIT
2 3
G.CUTOFF( )
▲
5 6
B. CUTOFF( )
▲
B. DRIVE( )
▲
8
9
B. CUTOFF( )
B. DRIVE( )
G.CUTOFF( )
G B
2. DRIVE (R)
DRIVE (B)
PAL
(R) * **
(B) * **
DISP : EXIT
1. Input a black and white signal (colour off).
2. Enter the SERVICE MENU.
3. Select 2. V/C from the SERVICE MENU, then select 1. CUT OFF
(R), (G) and (B) .
4. Set each value to initial setting value with 4～9 keys of the
remote control unit.
1
5. Press the key of the remote control unit to show the single
horizontal line on screen.
6. Turn the SCREEN VR fully counter-clockwise, then slowly turn it
clockwise to where one of a red, blue or green colour is faintly
visible.
4 9
7. Use keys ～ of the remote control unit and adjust the other 2
colours which except the appeared colour to where the single
horizontal line appears white.
8. Turn the SCREEN VR to where the single horizontal line glows
faintly.
2
9. Press the key to turn off the single horizontal line.
10. Press the DISPLAY key twice to return to the normal screen.
Adjustment item
1. CUT OFF
1. Input a black and white signal (colour off).
2. Enter the SERVICE MENU.
3. Select 2. V/C from the SERVICE MENU.
4. Select 2. DRIVE (R) / (B) with MENU ▼/▲ key, and set each
value to initial setting value with 4 and 7 or 6 and 9 keys of the
remote control unit.
4 7
5. Use the keys and
6. Press the DISPLAY key twice to return to the nomal screen.
Adjustment item
2. DRIVE
No. 52027
Description
Variable Initial setting
range value
-128～+127
R -50
-128～+127
G -50
-128～+127
B -50
6 9
or and to produce a white screen
Variable Initial setting
range value
-128～+127
R +0
-128～+127
B +0
AV-21Q3
AV-21QMG3
AV-2115EE
23