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19. X-RAY RADIATION TEST.
19.1 NORMAL HIGH VOLTAGE
19.1.1
APPLY FULL BLACK PATTERN AT 640x480/ 60HZ MODE.
19.1.2
SET CONTRAST 0%, BRIGHTNESS 0%.
19.1.3
MEASURE HIGH VOLTAGE MUST BE 26KV + 1KV.
19.1.4
APPLY FULL BLACK PATTERN AT 1024x768 / 85HZ MODE.
19.1.5 REPEAT
STEP 19.1.3
19.2 HIGH VOLTAGE REGULATION
19.2.1
APPLY FULL WHITE PATTERN AT 1024x768/ 85HZ MODE.
19.2.2
SET CONTRAST 100%, BRIGHTNESS 100%, MEASURE HV.
19.2.3
SET CONTRAST 0%, BRIGHTNESS 0%, MEASURE HV.
19.2.4
COMPARE THE DIFFERENCE BETWEEN ITEM 19.2.2. & 19.2.3, THE VOLTAGE REGULATION
SHOULD BE LESS THAN 1.5KV.
19.3 HOLD-DOWN TEST
19.3.1
APPLY FULL BLCAK PATTERN AT 640x480/ 60HZ MODE.
19.3.2 SET
CONTRAST 100%, BRIGHTNESS 50%.
19.3.3
ZD405 IS PARALLELED WITH 27K RESISTOR, THE MONITOR MUST BE SHUTDOWN.
19.3.4
TURN OFF, REMOVE PARALLELED RESISTOR, THEN TURN ON AGAIN, MONITOR MUST
BE OPERATED NORMALLY.
19.4 FAULT TEST.
19.4.1
APPLY FULL WHITE PATTERN AT 1024x768/ 85HZ MODE.
19.4.2
SET CONTRAST 0%, BRIGHTNESS 50%.
19.4.3
ADJUST VR403 TO MAXIMUM POSITION.
19.4.4
ADJUST FBT SCREEN VR, LET BEAM CURRENT BE 9uA, MEASURING THE H.V AND
X-RADIATION.
19.4.5
THE H.V. SHOULD BE UNDER 29KV AND X-RADIATION SHALL BE LESS THAN 0.1Mr/HR.
19.4.6
THE NORMAL ADJUST SHOULD BE RECOVERED AFTER THIS TEST IS FINISHED.
19.5 X-RAY RADIATION TEST.
19.5.1
TO SIMULATE S-RAY PROTECTION CIRCUIT: USE 18K, 5% RESISTOR TO PARALLED WITH R476
19.5.2
CONTROL VR403 TO SET AT MINIMUM POINT.
19.5.3
APPLY FULL WHITE PATTERN AT 1024x768/ 85HZ MODE.
19.5.4
ADJUST CONTRAST/BRIGHTNESS SETTING BACK AND FROTH TO GET A BEAM CURRENT
AT 50uA, 200uA, 400uA RESPECTIVELY.
19.5.5
ADJUST VR403 TO GET H.V. GRADUALLY UNIT THIS TESED SET IS AT THE THERSHOLD
OF SHUTDOWN BUT STILL WORKING.
19.5.6
RECORD THE HIG VOLTAGE OF THERSHOLD AT 50uA, 400uA, THE H.V. SHALL BE LESS
THAN 31KV.
19.5.7
USE TVX-1A/ 1B/ 2000 AND RF/D TO MEASURE THE X-RADIATION AT THE POSITION OF
TOP, BOTTOM, RIGHT, LEFT, FRONT AND BACK SIDE OF THE MONITOR, THEN WRITE
DOWN THE READINGS AT EACH SIDE OF THE TESED UNIT.
19.5.8
THE X-RAY RADIATION SHALL BE LESS THAN 0.1Mr/hr.
19.5.9
THE NORMAL CONDITION SHOULD BE RECOVERED AFTER ALL TEST ITEMS ARE
FINISHED.
D: CHASSIS ALIGNMENT / TEST SPECIFICATION.
1. POWER SUPPLY ALIGNMENT: INPUT SIGNAL: VGA480 CROSS-HATCH PATTERN/
1.1 ADJUST VR101 UNTIL DC=75V
̈́
0.3V AT TP201
1.2 ADJ VR403 UNTIL VOLTAGE AT TP208 = 63.0V
̈́
0.3V.
2. MEASURE
TP201 = 105 V ± 5%
TP202 = 46.5 V ± 5%
TP203 = 13.5 V ± 5%
TP204 = 7.5
V ± 5%
TP205 = 12
V ± 5%
TP206 = 6.3
V ± 5%
TP207 = 5.5
V ± 5%
TP208 =-13.5 V ± 5%
13
ViewSonic Corporation
Co
nfidential - Do Not Copy
70f+SB-3
E
Содержание E70F - 17" CRT Display
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