JVC AV-20N3/D, AV-20NMG3/-A, AV-20NMG3B service manual Deflection Circuit Adjustment, Position

AV-20N3

AV-20NMG3

AV-20NMG3B

DEFLECTION CIRCUIT ADJUSTMENT

"There are 2 modes of adjustment (setting value) ------ ① 50Hz mode and ② 60Hz mode ----- depending upon the kind of signals (vertical frequency 50Hz / 60Hz).

"When adjusted in mode ① , mode ② will be automatically set.

The setting (adjustmen t) usin g 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 settin g values.

Item

Measuring instrument

Test point

Ad justment part

Description

Ad justment

Signal

1.

VER. POSITION

1. Input a circle pattern signal.

of V.HEIGHT

generator

3.

VER. HEIGHT

2. Enter the SERVICE MENU.

&

Remote

3.

Select 3. DEF. from SERVICE MENU.

Select 1. VER. POSITION with the MENU ▼/▲ key.

V.POSITION

control unit

4.

5.

Set the initial setting value with the MENU - / + key.

SUB MENU 3. DEF

6.

Adjust V and V’ to be equal with the MENU - / + key as shown in

Fig.2.

7.

Input a cross -hatch signal.

DEF

PAL

8. Select 3. V. HEIGHT with the MENU ▼/▲ key.

1. VER. POSITION

***

9.

Set the initial setting value with the MENU - / + key.

10.As shown in Fig.1, adjust VER. HEIGHT and make the vertical

50Hz

screen size 92% of the picture size with the MENU - / + keys of

remote control unit.

/ :SELECT

- / + : OPERATE

DISP : EXIT

Scre en size

	Scre en
							Picture
	size						size
	92%					10 0%
			Picture size 1 00%
				Fig.1
Ad justment		Signal			2.HOR. POSITION			11.Input a circle pattern signal.
of HOR.		generator						12.Select 2. HOR POSITION with the MENU ▼/▲ key.
POSITION		Remote						13.Set the initial setting value of 2. HOR. POSITION with the
								MENU - / + key.
		control unit
								14.Adjust 2. HOR. POSITION to make H=H" as shown in Fig.2
								with the MENU - / + key.

H	H"
	V
	V'
	Fig.2

No. 52025 27