Dell 21N21E2 service manual Contrast Cent, NO. Function

ELECTRICAL ADJUSTMENTS

2-13: TINT

1.Receive the NTSC color bar pattern. (Audio Video Input)

2.Using the remote control, set the brightness and contrast to normal position.

3.Connect the oscilloscope to TP024.

4.Activate the adjustment mode display of Fig. 1-1and press the channel button (20) on the remote control to select "TINT".

5.Press the VOL. +/- button on the remote control until the section "A" becomes a straight line. (Refer to Fig. 2-2)

"A"

Fig. 2-2

2-14: CONTRAST CENT

1.Activate the adjustment mode display of Fig. 1-1and press the channel button (22) on the remote control to select "CONTRAST CENT".

2.Press the VOL. +/- button on the remote control until the contrast step No. becomes "35".

3.Receive a broadcast and check if the picture is normal.

4.Set to the AV mode. Then perform the above adjustments 1~3.

2-15: Confirmation of Fixed Value (Step No.)

Please check if the fixed values of the each adjustment items are set correctly referring below.

NO. FUNCTION		RF	AV
02	AGC GAIN	00	---
04	R CUTOFF	00	---
06	G CUTOFF	00	---
07	B DRIVE	45	---
09	V POSI (50)	08	---
10	V POSI (60)	00	---
18	BRIGHT MAX	40	40
19	BRIGHT MIN	09	09
20	TINT	32	ADJ.
21	SHARP	02	02
23	CONTRAST MAX	50	50
24	CONTRAST MIN	10	10
26	COLOR MAX	50	50
27	COLOR MIN	10	10
30	M B CUT OFF	127	---
31	CVBS OUT	31	---
32	APR THRESHOLD	00	---
33	BELL FILTER	10	---
34	BANDPASS	00	---
35	H POSI OSD	118	---
36	V POSI OSD	50	---
37	H POSI TEXT	122	---
38	V POSI TEXT	58	---

*To check for the fixed values of the RF (60Hz), indicate the adjustment mode screen while input the 60Hz video signal.

D-3