JVC AV-20N3/D, AV-20NMG3/-A, AV-20NMG3B service manual Video / Chroma Circuit Adjustment

AV-20N3

AV-20NMG3

AV-20NMG3B

VIDEO / CHROMA CIRCUIT ADJUSTMENT

The setting (adjustment) 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 setting valu es. Do not change the initial setting values of the setting items not listed in “ADJUSTMENT”.

	Item	Measuring		Test point			Ad justment part		Description
		instrument
Ad justment		Signal				1. CUT OFF (R)			1. Input a black and white signal (colour off).
of WHITE		generator						CUT OFF (G)	2. Enter the SERVICE MENU.
BALANCE		Remote						CUT OFF (B)	3. Select 2. V/C from the SERVICE MENU, then select 1. CUT OFF
(Low light)		control unit							(R), (G) and (B) .
								SCREEN VR	4. Set each value to initial setting value with 4～9 keys of the
								[IN HVT]	remote control unit.
									5. Press the 1 key of the remote control unit to show the single
									horizontal line on screen.
									6. Turn the SCREEN VR fully counter-clockwise, then slowly turn it
			V/C		PAL				clockwise to where one of a red, blue or green colour is faintly
			1. CUTOFF						visible.
					(R) * **
									7. Use keys 4 ～9 of the remote control unit and adjust the other 2
					(G) * **
					(B) * **				colours which except the appeared colour to where the single
			50Hz						horizontal line appears white.
		/ :SELECT
									8. Turn the SCREEN VR to where the single horizontal line glows
		- / + : OPERATE			DISP: EXIT
									faintly.
									9. Press the 2 key to turn off the single horizontal line.
									10.Press the DISPLAY key twice to return to the normal screen.
	KEY ASSIGNMENT OF REMOTE CONTROL UNIT

CUTOFF OFF
(H.LINE OFF)	1
CUTOFF ON
(H.LINE ON)
R. CUTOFF( ▲ )	4
R. DRIVE( ▲ )
R. CUTOFF( ▼ )	7
R. DRIVE( ▼ )
	R

2

5

8

G

3

6

9

B

G.CUTOFF( ▲ ) B. CUTOFF( ▲ ) B. DRIVE( ▲ )

B. CUTOFF( ▲)

B. DRIVE( ▲ )
G.CUTOFF(	▲	)

Ad justment item		Variable	Initial setting
		range	value
	R	-128～+127	-50
1. CUT OFF	G	-128～+127	-50
	B	-128～+127	-50

Ad justment	Signal	2. DRIVE (R)
of WHITE	generator	DRIVE (B)
BALANCE	Remote
(High light)	control unit

		V/C	PAL
	2. DRIVE		(R) * **
		50Hz	(B) * **
/		:SELECT
- / + : OPERATE			DISP : EXIT

1.Input a black and white signal (colour off).

2.Enter the SERVICE MENU.

3.Select 2. V/C from the SERVICE MENU.

4.Select 2. DRIVE (R) / (B) with MENU ▼/▲ key, and set each value to initial setting value with 4 and 7 or 6 and 9 keys of the remote control unit.

5.Use the keys 4 and 7 or 6 and 9 to produce a white screen

6.Press the DISPLAY key twice to return to the nomal screen.

Ad justment item		Variable	Initial setting
		range	value
2. DRIVE	R	-128～+127	+0
	B	-128～+127	+0

22 No. 52025