ViewSonic VA521 Manuel de service télécharger pdf (Page 19)

5.1.

ADJUSTMENT CONDITIONS AND PRECAUTIONS

Approximately 30 minutes should be allowed for warm up before proceeding.

Adjustments should be undertaken only on those necessary elements since most of them have been carefully

preset at the factory.

ESD protection is needed before adjustment.

5.2.

MAIN ADJUSTMENTS

NO. FUNCTION DESIGNATION

1. V-com Voltage On the back of the Panel

2. Eeprom Initial Function Key

3. White Balance Function Key

5.3.

ALIGNMENT PROCEDURES

Adjustment Conditions and Precautions:

(A).

Power supply voltage:

AC 110/120V±10% 60 Hz±5%, AC 220/240V±10% 50 Hz ±5%.

(B).

Warm up time:

The display must be power ON for at least 30 minutes at full white pattern before starting alignments.

This is especially critical in color temperature and white balance adjustments.

(C).

Signals: reference the front detail specifications and timing table.

Video : reference the front detail specifications.

1. Adjustment of V-com Voltage:

Timing : 1024x768@60Hz. 48KHz

Pattern : The picture of “ Shut down windows” or Full screen pixel ON/OFF pattern.

Adjust V-com to let the center of the screen no flash.

2. Eeprom Initial:

Timing : 1024x768@60Hz.

Pattern : Cross hatch.

Switch off the power and press the “▲” and “ 2 “ key simultaneously, then switch on the power. At

this time we can enter into the factory mode when press the “ 1 “key.

Select the “EEPROM INIT” item and press “ 2 “key to reset the Eeprom.

3. White Balance Adjustment :

Timing : 1024x768@60Hz.

Pattern : 16Gray Level. or 5-MOSAIC (Pattern 42)

Set CA210 color analizer at the center of screen and along a perpendicular to the screen at 0cm from

the display.

Move “▼” key to select the “ WHITE BALANCE” item in the factory mode and press “ 2 “key,

then the white balance will be auto dadjusted.

Color temperature verification: (Set Brightness and Contrast to Maximum)

6500K verify : press “▼” ,“▲” key to move cursor to 6500K at factory mode

and press “ 2 “ key, and then check the color temperature is

x=0.313 ±0.02

y=0.329 ±0.02

Y≧200 cd/m

5. Adjusting Procedure

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ViewSonic VA521 Manuel de service Page 19

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