Emerson 6420FE service manual Cut-off Adjustment, White Balance Adjustment, Tape Spec, Mode Input

12. Cut-off Adjustment

Purpose: To adjust the beam current of R, G, B, and screen voltage.

Symptom of Misadjustment: White color may be reddish, greenish or bluish.

Test Point	Adj. Point	Mode	Input
	Screen-Control		Black
---	CH o / p	RF
			Raster
	buttons
Tape	M. EQ.		Spec.
---	Pattern	See Reference
	Generator	Notes below.

Figure

PATTERN GENERATOR

EXT. INPUT Fig. 2

Note: Screen Control FBT --- Main CBA

F.B.T= Fly Back Transformer

Use service remote control unit

1.Degauss the CRT and allow CRT to operate for 20 minutes before starting the alignment.

2.Input the Black Raster Signal from RF Input.

3.Enter the Service mode. (See page 5-1)

4.Press "VOL p" button on the service remote con- trol unit and select "C/D" mode. (Display changes "C/D," "7F," "LANGUAGE," "ACCESS CODE," "SOUND TYPE," "VIDEO TONE," "FM MODE," "V-OUT," "VIDEO," "AV MEMO," "STABLE SOUND," "FILTER," "1000," "YUV MEMORY," "NO SIG BRT," "A-MUTE POL," and "V-MENU" cyclically when "VOL p button is pressed.) then press "1." The display will momentarily show "CUT OFF R" (R= Red). Now there should be a horizon- tal line across the center of the picture tube. If needed gradually turn the screen control on the fly- back, clockwise until the horizontal line appears. Adjust the Red Cut off by pressing the "CH o/p" buttons. Proceed to Step 5 when the Red Cut off adjustment is done.

5.Press the "2" button. The display will momentarily show "CUT OFF G" (G=Green). Adjust the Green Cut off by pressing the "CH o/p" buttons. Proceed to step 6 when the Green Cut off adjustment is done.

6.Press the "3" button. The display will momentarily show "CUT OFF B" (B=Blue). Adjust the Blue cut off by pressing the "CH o/p" buttons. When done with steps 4, 5 and 6 the horizontal line should be pure white if not, then attempt the Cut off adjust- ment again.

13. White Balance Adjustment

Purpose: To mix red, green and blue beams correctly for pure white.

Symptom of Misadjustment: White becomes bluish or reddish.

Test Point	Adj. Point	Mode	Input
			White
Screen	CH o / p	RF	Raster
	buttons		(APL
			100%)
Tape	M. EQ.	Spec.
	Pattern
---	Generator,	See below
	Color analyzer
	Figure
	Color Analyzer		Fig. 3

Note: Use service remote control unit

1.Operate the unit more than 20 minutes.

2.Face the unit to east. Degauss the CRT using De- gaussing Coil.

3.Input the White Raster (APL 100%).

4.Set the color analyzer to the CHROMA mode and after zero point calibration, bring the optical recep- tor to the center on the tube surface (CRT).

5.Enter the Service mode. Press "VOL p" button on the service remote control unit and select "C/D" mode. (Display changes "C/D," "7F," "LANGUAGE," "AC- CESS CODE," "SOUND TYPE," "VIDEO TONE," "FM MODE," "V-OUT," "VIDEO," "AV MEMO," "STABLE SOUND," "FILTER," "1000," "YUV MEMORY," "NO SIG BRT," "A-MUTE POL," and "V-MENU" cyclically when "VOL p" button is pressed.) then Press No. 8 button on the service re- mote control Unit.

6.Press No. 4 button on the service remote control unit for Red adjustment. Press N0. 5 button on the service remote control unit for Blue adjustment.

7.In each color mode, Press "CH o/p" button to adjust the values of color.

8.Adjusting Red and Blue color so that the temperature becomes 9200K (x: 286 / y: 294)±3%.

9.At this time, Re-check that Horizontal line is white. If not, Re-adjust Cut-off Adjustment until the Hori- zontal Line becomes pure white.

10.Turn off and on again to return to normal mode. Re- ceive APL 100% white signal and Check Chroma temperatures become 9200K (x: 286 / y: 294)±3%.

Note: Confirm that Cut Off Adj. is correct after this adjustment, and attempt Cut Off Adj. if needed.

5-5 L2401EA