NEC NEC MultiSync LCD1550X LCD1550X LCD1550X, Service Manual

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2-13
2.8.1.9 Confirming power management function
(1) Input the specified timing with signal generator, and set the pattern to full white.
Mode H V Power voltage Input timing Power consumption
Normal On On AC240V 50Hz 60KHz75Hz
i
XGA75
j
38W or less
Power-Save Off Off
“ “
3W or less
(2) Input the timings mentioned above, and confirm the image display or OSM display.
Turn the signal generator H-sync / V-sync OFF, and turn G signal OFF.
(3) Confirm that Power-On Indicator by power-SW turns to orange.
(4) Confirm that the picture returns within four seconds when H-sync/ V-sync and VIDEO signals are input.
2.8.1.10 Isolation voltage
Confirm that the abnormality is never seen when AC1500V is applied for two seconds across AC earth GND pin
to chassis GND. Cut-off current must be 10mA.
2.8.1.11 Ground resistance
Confirm that the resistance must be less than 100m ohms or less when 25A is applied across AC earth GND pin
to chassis GND.
2.8.1.12 Shock test
(1) Input confirmation timing with signal generator, and set the pattern to OPTION2 (pattern 06).
(2) Confirm that there is no abnormality in the image when shock is applied to the monitor. Do not apply shock
on the front of the liquid crystal panel.
2.8.1.13 Confirming color selecting (AccuColor) function
(1) Input timing No. 14 (60kHz/75Hz, XGA75) with signal generator, and input OPTION2 (pattern 0B), gray-scale
or full white for picture pattern.
(2) Confirm that color temperature varies by switching Color No. (1, 2, 3, sRGB, 5 and N (NATIVE).