Magnavox MWC24T5 service manual Cut-off Adjustment, Size Adjustment, Pincushion Adjustment

4. 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

RF Input

Fig. 2

Notes: Screen Control --- FBT (Sub CBA),

FBT = Fly Back Transformer,

Use the Remote Control Unit.

1.Degauss the CRT and allow the unit 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 1-7-1.)

4.Press the [VOL p] button.

(Press [VOL p] button then display will change “C/D”, “7F” and Initial Setting.)

5.Choose CUT OFF/DRIVE mode then press [1] button. This adjustment mode is CUT OFF (R).

6.Increase the screen control so that the horizontal line just appears on the CRT.

7.Press the [CH. o / p] buttons until the horizontal line becomes white.

8.Choose CUT OFF/DRIVE mode then press [2] button. This adjustment mode is CUT OFF (G). Press [CH. o / p] buttons until the horizontal line becomes white.

9.Choose CUT OFF/DRIVE mode then press [3] button. This adjustment mode is CUT OFF (B). Press [CH. o / p] buttons until the horizontal line becomes white.

5. H. Size Adjustment

Purpose: To obtain correct size of screen image.

Symptom of Misadjustment: Size of screen image may not be properly displayed.

Test point	Adj. Point	Mode		Input
---	VR2531	---		Monoscope
Tape	M. EQ.		Spec.
---	Pattern Generator	90+1%/-5%

Note: VR2531 --- Sub CBA

1.Input monoscope pattern.

2.Adjust VR2531 so that the monoscope pattern is 90+1%/-5% of display size and the circle is round.

6. H. Pincushion Adjustment

Purpose: To obtain straight line on the screen.

Symptom of Misadjustment: Straight line image may not be properly displayed.

Test point	Adj. Point	Mode		Input
---	VR2530	---		Crosshatch
Tape	M. EQ.		Spec.
---	Pattern Generator	See below

Note: VR2530 --- Sub CBA

1.Input crosshatch pattern.

2.Adjust VR2530 so that the lines of the crosshatch pattern become straight.

1-7-3 T2202EA