JVC AV-21VT14/P Service Manual page 19

Flat colour television basic chassis cw
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4.7.4 VIDEO CIRCUIT ADJUSTMENTS
• 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 PROCEDURE".
• The initial setting values in parenthesis (
Adjustment item
1. SCREEN
BRI
2. CUTOFF
B
G
3. WDR
R
G
B
4. BRIGHT
RF
VIDEO 1(COMPOSITE/S)
VIDEO 2(COMPONENT)
VIDEO 3(COMPOSITE)
5. CONT.
RF
VIDEO
RF 16:9
VIDEO 16:9
6. COLOUR
RF
VIDEO
7. TINT
RF
VIDEO
8. SHARP
RF
VIDEO
9. Y DELAY
RF
VIDEO
S-VIDEO
10. TINT DVD
VIDEO, S-VIDEO
COMPONENT
11. AMP T.SHARP
RF, VIDEO
Measuring
Item
instrument
WHITE
Signal
BALANCE
generator
(Low light)
adjustment
Remote
control unit
REMOTE CONTROL UNIT
B CUTOFF (
)
B CUTOFF (
)
) are fixed offset values, needing no further adjustment.
Variable range
0 ~ 63
0 ~ 63 (-32 ~ +31)
0 ~ 63 (-32 ~ +31)
0 ~ 63 (-32 ~ +31)
0 ~ 63 (-32 ~ +31)
0 ~ 63 (-32 ~ +31)
0 ~ 63 (-32 ~ +31)
(-32 ~ +31)
(-32 ~ +31)
(-32 ~ +31)
0 ~ 63
(-32 ~ +31)
(-32 ~ +31)
(-32 ~ +31)
0 ~ 63 (-32 ~ +31)
0 ~ 63 (-32 ~ +31)
0 ~ 63 (-32 ~ +31)
(-32 ~ +31)
0 ~ 63
0 ~ 63
0 ~ 15
0 ~ 15
0 ~ 15
0 ~ 63
(-32 ~ +31)
0 ~ 63
Test point
Adjustment part
[2. V/C]
2. CUTOFF (B)
2. CUTOFF (G)
SCREEN VR
[In HVT]
V/C
PAL
2. CUTOFF
(B)
(
)
**
**
(G)
(
)
**
**
1
2
3
G CUTOFF (
4
5
6
7
8
9
G CUTOFF (
PAL
SECAM
32
32
11
11
7
7
32
32
32
32
45
45
---
---
(+1)
(+1)
(+1)
(+1)
(+1)
(+1)
---
---
(-3)
(-3)
(-2)
(-2)
---
---
---
---
42
30
---
---
---
---
---
---
54
54
---
---
2
4
7
10
34
31
---
---
0
0
Note:
• Set PICTURE MODE (VSM) to "BRIGHT".
- COMPOSITE WHITE BALANCE -
(1) Receive a PAL black and white signal (colour off).
(2) Select 2. V/C from the SERVICE MENU.
(3) Select 2. CUTOFF (B) and (G).
(4) Set each value to initial setting value with the [4] /
[7] keys and [5] / [8] keys.
(5) Turn the SCREEN VR fully counterclockwise, then
slowly turn it clockwise to where a red, blue or
green colour is faintly visible.
(6) Use the [4] / [7] and [5] / [8] keys to adjust so that
the other 2 colours appear white.
(7) Turn the SCREEN VR to where the single
horizontal line glows faintly.
(8) Press the [DISPLAY] key twice to return to the
normal screen.
- COMPONENT WHITE BALANCE -
(1) Receive a PAL component black and white signal
(colour off).
(2) Select VIDEO-2 SET from the MENU and set
VIDEO-2 SET to COMPONENT.
(3) Adjust COMPONENT WHITE BALANCE in the
)
same way as "COMPOSITE WHITE BALANCE".
Adjustment Item
2. CUT OFF
)
Initial setting value
COMPONENT (V-2)
NTSC3.58
NTSC4.43
525i
32
32
32
11
11
(+3)
7
7
(-5)
32
32
(0)
32
32
(0)
45
45
(0)
39
---
---
(+1)
(+1)
---
(+1)
(+1)
(+2)
(+1)
(+1)
---
32
---
---
(-3)
(-3)
(-2)
(-2)
(-2)
---
---
---
---
37
---
---
(+3)
(+3)
(+9)
32
---
---
(+2)
(+2)
---
54
---
---
54
54
40
3
---
---
3
3
---
7
7
---
32
32
---
---
---
(+1)
0
0
0
Description
Initial setting value
Variable
range
COMPOSITE COMPONENT
B 0 ~ 63(-32~+31)
11
G
0 ~ 63(-32~+31)
7
(No.YA140)1-19
625i
32
(+3)
(-5)
(0)
(0)
(0)
---
---
(+2)
---
---
(-2)
---
---
---
(+0)
---
---
---
40
---
---
---
---
(0)
0
(+3)
(-5)

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