JVC AV-21PM Service Manual page 20

AV-21PM
DEFLECTION CIRCUIT ADJUSTMENT
There are 2 modes of adjustment (initial setting value) — 50Hz mode and 60Hz mode — depending upon the kind of signals (vertical
frequency 50Hz / 60Hz).
When adjusted in 50Hz mode, 60Hz mode will be automatically set.
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.
[SUB MENU 3. DEF]
Setting item
1. VER. POSITION Vertical center
2. HOR. POSITION Horizontal center
3. VER. HEIGHT Vertical height
4. VER. LINEARITY Vertical linearity
5. VER. SCURVE Vertical scurve
6. HOR. VCO ADJUST Horizontal VCO
7. HOR. WIDTH Horizontal width
8. EW-PIN Side pin correction
9. EW-CORNER Side pin fore correction
10. TRAPEZ Trapezoidal distortion correction
11. VER. EDGE Vertical edge correction
12. HOR. COMP Horizontal compensation
13. VER. POS2 Vertical center 2
: Do not adjust.
Measuring
Item
instrument
Adjustment Signal
of generator
V-POSITION Remote
control
unit
H
20
Adjustment name
Test point Adjustment part
1. VER. POSITION
H'
V
V'
No. 56055
Variable range
50Hz
−4 ~ +3 −2
−16 ~ +15 −1
−64 ~ +63
+13
−16 ~ +15
+7
−16 ~ +15 −5
−64 ~ +63
−32 ~ +31 −1
−32 ~ +31 −5
−8 ~ +7 −3
−32 ~ +31 −13
−8 ~ +7
−8 ~ +7 −2
−4 ~ +3
[ fv : 50Hz mode]
1. Receive a circle pattern signal.
2. Select 3. DEF from the SERVICE MENU.
3. Select 1. VER. POSITION with the MENU a key.
4. Set the initial setting value of 1. VER. POSITION with the MENU
− / + key.
5. Adjust VER. POSITION to make V = V'.
(to be continued)
Initial setting value
60Hz
−2
+1
−2
0
0
0 0
−5
0
+2
−5
0 0
−2
0 0
Description