Toshiba 50A50 55A60, 50A60 service manual Electrical Adjustment, Adjustment Procedure

ELECTRICAL ADJUSTMENT

ITEM			ADJUSTMENT PROCEDURE
VERTICAL POSITION (VCEN)	1.	Call up the adjustment mode display, then select item VCEN.
	2. Press the VOLUME s or t button to get the voltage +30 ±10 mV.
	3. Measuring method of voltage as follows.
		TP-V
		(on SIGNAL board)			DIGITAL
					VOLT METER
		TP-G		C
		(on SIGNAL board)
SUB-BRIGHTNESS	1.	Constrict the picture height until the
(BRTC)		vertical retrace line appears adjusting
		the HEIGHT control on the MAIN board.
	2.	Adjust the CONTRAST to the minimum
		and BRIGHTNESS to the center.
	3.	Enter the service mode, then select
		“BRTC” register.
	4.	Adjust the data value so the belt of
		vertical retrace line just disappear.

	5. Adjust the HEIGHT control.
		* Adjust the SUB-BRIGHTENESS after		Vertical	retrace line
		adjusting the WHITE BALANCE.
SUB-COLOR	1.	Receive color-bar signal from color-bar generator.
(SCOL)	2.	Adjust the BRIGHTNESS and CONTRAST to the center (RESET status).
SUB-TINT	3.	Connect oscilloscope to TP501on the MAIN board.
(TNTC)	4.	Enter the service mode, then select “SCOL”.
	5.	Temporarily adjust the data value to		Blue
		achieve about 1V0-pof blue bar.
	6.	Select “TNTC” register.	Magenta
	7.	Adjust the data value to obtain the blue					3 (	1.8V0-P)
						2
		bar to magenta bar ratio of 3:2 as
		shown.	0

8.Select “SCOL” register.

9.Adjust the data value to achieve 1.8V0-pof blue bar on scope.

10.Check the picture with off-air signal.

SUB-CONTRAST	1.	Tune in a color program and adjust the BRIGHTNESS and CONTRAST to
(SCNT)		normal mode(RESET).
	2.	Enter the service mode, then select "SCNT" register.
	3.	Change "SCNT" data to13H.
	4.	Check the picture contrast.
PICTURE POSITION	1.	Receive the pattern signal which shows it's center
		on the screen.
	2.	Adjust the picture position alternately by turning
		CENTERING MAGNETS for proper picture position.
	3.	Check the picture with off-air signal.

SPECIFIC INFORMATIONS GENERAL ADJUSTMENTS

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