ViewSonic E70F Service Manual - Page 6

Specification - monitor

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2. Specification A. GENERAL 1. ALL SPECIFICATION MUST BE MET OVER LINE VOLTAGE RANGE OF 90 VAC TO 264VAC 50HZ/ 60HZ, UNLESS OTHERWISE SPECIFIED. 2. OPERATING TEMPERATURE RANGE IS 0o C TO 40o C WITH A RELATIVE HUMIDITY OF 10% OR LESS TO 90%. 3. THE MONITOR MUST BE OPERATIONAL IN AN USABLE STATE WITHIN 30 SECONDS AFTER TURN-ON. 4. ALL SIGNAL LEVELS ARE MEASURED ASSUMING TERMINATION AT THE MONITOR'S INPUT JACKS OR IN ITS CHARACTERISTIC IMPEDANCE. 5. AN AMBIENT LIGHTING LEVEL OF 400 TO 600 LUX IS ASSUMED WHEN SETTING BRIGHTNESS FOR RASTER EXTINCTION THRESHOLD. 6. ALL PURITY RELATED SPECIFICATIONS MUST BE MET WITHOUT EXTERNAL DEGAUSSING. 7. ALL CONTROLS MUST HAVE EXCESS RANGE (NO CONTROL MAY BE LEFT AT AN END STOP WHEN PROPER ALIGNMENT IS COMPLETED). 8. THE MONITOR IS NOT REQUIRED TO MEET SPECS DURING THE FOLLOWING BUT MUST TOLERATE, WITHOUT DAMAGE TO THE CRT OR CIRCUITS, ANY SEQUENCY OR COMBINATION OF POWER ON AND OFF, SIGNAL ON AND OFF, ERRATIC, WRONG FREQUENCY OR NOISY INPUTS WHILE AT ANY POSSIBLE UNPLUGGING OF POWER OR SIGNAL, SETTINGS OF USER ACCESSIBLE CONTROLS. LIKEWISE, THE MONITOR SHOULD SURVIVE EXTENDED PERIODS OF OPERATION WITH LINE VOLTAGE REDUCED BELOW THE SPECIFIED MINIMUM. 9. AN ISOLATION TRANSFORMER SHOULD BE USED WHEN PERFORMING ALIGNMENT AND TESTS. PORTIONS OF THE POWER SUPPLY BOARD ARE HOT GROUND. THE REMAINING BOARDS ARE COLD GROUND. 10. DISCHARGE OF CRT ANODE SHOULD BE DONE ONLY TO CRT GROUND STRAP. 11. GEOMETRIC MEASUREMENT IS ASSUMED TO BE MAKING ALONG A STRAIGHT SURFACE WITH A FLAT RULE OR TEMPLATE. B. INSTRUMENT ALIGNMENT 1. DEFLECTION PRESETS CONTROL POTS VR101, VR401, VR403, FOCUS VR ARE SET AT MIDDLE POINT. SCREEN VR SET TO MIN. 2. POWER SUPPLY ALIGNMENT 2.1 INPUT VGA 640X480 SIGNAL CROSSHATCH PATTERN & BEAM CURRENT SET AT 0uA. 2.2 ADJUST VR101 UNTIL DC=105V̈́0.3V AT TP201 2.3 ADJUST G2 UNTILL PICTURE VISIBLE. 2.4 ADJ VR403 UNTIL VOLTAGE AT TP208 = 63.0V ̈́ 0.3V. 3. SIZE & GEOMETRY ADJUSTMENT 3.1 RASTER CENTERING 3.1.1 INPUT CROSSHATCH PATTERN AT 60KHZ 1024*768 MODE. 3.1.2 ADJUSTCONTRAST TO 10FL, ADJUST SCREEN JUST RASTER VISIBLE. 3.1.3 ADJUST VR401 TO CENTER RASTER ON SCREEN SUCH THAT THE HORIZONTAL DISTANCE FORM THE MIDPOINT OF THE LEFT DISPLAY EDGE TO THE LEFT BEZEL EDGE IS WITHIN 2MM. OF THE DISTANCE FROM MIDPOINT OF THE RIGHT BEZEL EDGE. ViewSonic Corporation A B I A-B I < 2mm BEZEL RASTER Confidential - Do Not Copy E70f+SB-3 3

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A. GENERAL
1.
ALL SPECIFICATION MUST BE MET OVER LINE VOLTAGE RANGE OF 90 VAC TO 264VAC 50HZ/ 60HZ, UNLESS OTHERWISE
2.
OPERATING TEMPERATURE RANGE IS 0
o
C TO 40
o
C WITH A RELATIVE HUMIDITY OF 10% OR LESS TO 90%.
3. THE MONITOR MUST BE OPERATIONAL IN AN USABLE STATE WITHIN 30 SECONDS AFTER TURN-ON.
4. ALL SIGNAL LEVELS ARE MEASURED ASSUMING TERMINATION AT THE MONITOR'S INPUT JACKS OR IN ITS
CHARACTERISTIC IMPEDANCE.
5.
AN AMBIENT LIGHTING LEVEL OF 400 TO 600 LUX IS ASSUMED WHEN SETTING BRIGHTNESS FOR RASTER
EXTINCTION
THRESHOLD.
6. ALL PURITY RELATED SPECIFICATIONS MUST BE MET WITHOUT EXTERNAL DEGAUSSING.
7.
ALL CONTROLS MUST HAVE EXCESS RANGE (NO CONTROL MAY BE LEFT AT AN END STOP WHEN PROPER
ALIGNMENT
IS COMPLETED).
8.
THE MONITOR IS NOT REQUIRED TO MEET SPECS DURING THE FOLLOWING BUT MUST TOLERATE, WITHOUT
DAMAGE
TO THE CRT OR CIRCUITS, ANY SEQUENCY OR COMBINATION OF POWER ON AND OFF, SIGNAL ON
AND OFF, ERRATIC,
WRONG FREQUENCY OR NOISY INPUTS WHILE AT ANY POSSIBLE UNPLUGGING OF POWER
OR SIGNAL, SETTINGS OF
USER ACCESSIBLE CONTROLS. LIKEWISE, THE MONITOR SHOULD SURVIVE EXTENDED
PERIODS OF OPERATION WITH
LINE VOLTAGE REDUCED BELOW THE SPECIFIED MINIMUM.
9.
AN ISOLATION TRANSFORMER SHOULD BE USED WHEN PERFORMING ALIGNMENT AND TESTS. PORTIONS OF
THE
POWER SUPPLY BOARD ARE HOT GROUND. THE REMAINING BOARDS ARE COLD GROUND.
10. DISCHARGE OF CRT ANODE SHOULD BE DONE ONLY TO CRT GROUND STRAP.
11. GEOMETRIC MEASUREMENT IS ASSUMED TO BE MAKING ALONG A STRAIGHT SURFACE WITH A FLAT RULE OR
TEMPLATE.
2. Specification
SPECIFIED.
B. INSTRUMENT ALIGNMENT
1.
DEFLECTION PRESETS
CONTROL POTS VR101, VR401, VR403, FOCUS VR ARE SET AT MIDDLE POINT. SCREEN VR SET TO MIN.
2.
POWER SUPPLY ALIGNMENT
2.1
INPUT VGA 640X480 SIGNAL CROSSHATCH PATTERN & BEAM CURRENT SET AT 0uA.
2.2
ADJUST VR101 UNTIL DC=105V
0.3V AT TP201
2.3 ADJUST G2 UNTILL PICTURE VISIBLE.
2.4
ADJ VR403 UNTIL VOLTAGE AT TP208 = 63.0V
0.3V.
3. SIZE & GEOMETRY ADJUSTMENT
3.1 RASTER CENTERING
3.1.1
INPUT CROSSHATCH PATTERN AT 60KHZ 1024*768 MODE.
3.1.2
ADJUSTCONTRAST TO 10FL, ADJUST SCREEN JUST RASTER VISIBLE.
3.1.3
ADJUST VR401 TO CENTER RASTER ON SCREEN SUCH THAT THE HORIZONTAL DISTANCE
FORM THE MIDPOINT OF THE LEFT DISPLAY EDGE TO THE LEFT BEZEL EDGE IS WITHIN
2MM. OF THE DISTANCE FROM MIDPOINT OF THE RIGHT BEZEL EDGE.
A
B
BEZEL
RASTER
I A-B I < 2mm
3
ViewSonic Corporation
Co
nfidential - Do Not Copy
70f+SB-3
E