JVC AV-21L91-BK Service Manual page 23

VC (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 (adjustment) items not listed in "ADJUSTMENT".
[SUB MENU 2. VC] : Do not adjust.
Setting (Adjustment)
Variable range
item
1 CUTOFF (R/G)
2 DRIVE (R/G/B) -30 – +31
BRIGHT
3 -30 – +31
(COM./TV/V-1/V-2/V-3)
4 CONT -30 – +31
5 COLOUR -30 – +31
6 TINT (TV/VIDEO) -30 – +31
7 SHARP (TV/VIDEO) -30 – +31
8 YDELAY (TV/VIDEO)
Measuring
Item
instrument
Adjustment Signal
generator
of WHITE
BALANCE
(Low light) Remote
control unit
REMOTE CONTROL UNIT
H.LINE OFF
1
H.LINE ON
4
R. CUTOFF ( 8 )
7
R. CUTOFF ( 9 )
PAL SECAM
-7 – +8 0
0
0/-18/0/0/0
-1/-16/0/0/0
-20
0
-5
-5
-5
—
—
-16/-2
-24/-10
-8 – +7 0/+1 +5/+1
Test point Adjustment part
1. CUTOFF (R)
CUTOFF (G)
SCREEN VR
[In HVT]
V/C PAL
1. CUTOFF (R)
**
(G)
**
50 Hz
MENU 89: SELECT
MENU - /+ : OPERATE DISPLAY : EXIT
2 3
G. CUTOFF ( 8 )
5 6
8 9
G.CUTOFF ( 9 )
Initial setting value
NTSC3.58 NTSC4.43
-3 -12
-3 -12
-3 -12 +1
— -15/+4 +1/+1
— -15/+6 +1/+1
0/+1 +5/0
Note:
• Set PICTURE MODE (VSM) to "BRIGHT".
1. Receive a PAL black and white signal (colour off).
2. Select 2. VC from the SERVICE MENU.
3. Select 1. CUTOFF (R) and (G) with MENU &/^ key, and set each
value to initial setting value with the 4 and 7 keys, or 5 and 8 keys on
the remote control unit.
4. Press the 1 key on the remote control unit to produce a single hori-
zontal line.
5. Turn the SCREEN VR fully counterclockwise, then slowly turn it clock-
wise to where a red, blue or green colour is faintly visible.
6. Use the keys 4 and 7 or 5 and 8 on the remote control unit and
adjust the other 2 colours to where the single horizontal line ap-
pears white.
7. Turn the SCREEN VR to where the single horizontal line glows faintly.
8. Press the 2 key to return to 1. CUTOFF screen.
9. Press the DISPLAY key twice to return to the normal screen.
Setting (Adjustment)
Item
1. CUT OFF
No. 51898
Remark
COMPONENT
AV-21L91-BK
AV-25L91-BK
AV-29L91-BK
AV-21L91-BK
—
AV-25L91-BK
— AV-29L91-BK
-2 +10 AV-21L91-BK
-6 +10 AV-25L91-BK
+10 AV-29L91-BK
AV-21L91-BK
—
AV-25L91-BK
— AV-29L91-BK
AV-21L91-BK
—/0
AV-25L91-BK
—/0 AV-29L91-BK
—
Description
Variable Initial setting
range
R –7 — +8
G –7 — +8
AV-21L91
AV-25L91
AV-29L91
value
0
0
23