Deflection Circuit Adjustments - JVC AV-21VT15 Service Manual

4.7.6 DEFLECTION 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.
• When performing deflection circuit adjustment, adjusts PAL signal (fv: 50 Hz) in 4:3 mode and 16:9 mode respectively, and adjust
the NTSC signal (fv: 60 Hz) similarly.
Note:
Proceed to the following adjustment after having completed the adjustments of SUB BRIGHT and SUB PICTURE.
4. DEF
Adjustment item
1. V-SHIFT
2. V-SLOPE
3. V-SIZE
4. H-CENT
5. H-SIZE
6. TRAPEZ
7. EW-PIN
8. COR-UP
9. COR-LO
10. ANGLE
11. BOW
12. V-S.CR
13. V-LIN
14. V-ZOOM
15. V-SCROLL
NOTE: The value with an asterisk * is variable for adjustment. The values in parenthesis (
COMPRESS: OFF (4:3)
Measuring
Item
instrument
V. SLOPE Signal
adjustment generator
Remote
control unit
V. POSITION Signal
adjustment generator
Remote
control unit
Variable range
4:3
Others
50Hz
0 ~ 63 -32 ~ +31
0 ~ 63 -32 ~ +31
0 ~ 63 -32 ~ +31
0 ~ 63 -32 ~ +31
0 ~ 63 -32 ~ +31
0 ~ 63 -32 ~ +31
0 ~ 63 -32 ~ +31
0 ~ 63 -32 ~ +31
0 ~ 63 -32 ~ +31
0 ~ 63 -32 ~ +31
0 ~ 63 -32 ~ +31
0 ~ 63 -32 ~ +31
0 ~ 63 -32 ~ +31
0 ~ 63 -32 ~ +31
0 ~ 63 -32 ~ +31
Test point Adjustment part
[4. DEF]
2. V-SLOPE
A
Blanking
line
B
[4. DEF]
1. V-SHIFT
Initial setting value
4:3
50Hz 60Hz
+32 0*
+32 0*
+38 0*
+32 0*
0 0*
0* 0*
0 0*
0* 0*
0* 0*
+32 0*
+32 0*
+32 0*
+32 0*
(+30) 0
(+32) (0)
) are fixed values.
Description
- PAL V. SLOPE -
(1) Receive a PAL circle pattern signal of vertical
frequency 50Hz.
(2) Select 4. DEF from the SERVICE MENU.
(3) Select 2. V-SLOPE.
(4) Set the initial setting value of 2. V-SLOPE.
(5) Adjust 2. V-SLOPE to make "A = B".
(6) Press the [DISPLAY] key twice to return to
SERVICE MENU screen.
- NTSC V. SLOPE -
(1) Receive a NTSC circle pattern signal of vertical
frequency 60Hz.
(2) Make similar adjustment of NTSC V-SLOPE in the
same way as for "PAL V-SLOPE".
- PAL V. POSITION -
(1) Receive a PAL circle pattern signal of vertical
frequency 50Hz.
(2) Select 1. V-SHIFT.
(3) Set the initial setting value of 1. V-SHIFT.
(4) Adjust 1. V-SHIFT to make "A = B".
- NTSC V. POSITION -
(1) Receive a NTSC circle pattern signal of vertical
frequency 60Hz.
(2) Make similar adjustment of NTSC V. POSITION in
the same way as for "PAL V. POSITION".
COMPRESS (16:9)
50Hz 60Hz
0* 0*
0* 0*
-14 0
0* 0*
0* 0*
0* 0*
0* 0*
0* 0*
0* 0*
0* 0*
0* 0*
0* 0*
0* 0*
-13 +3*
(0) (0)
(No.YA254)1-23