Set Adjustments; Measuring Instruments To Be Used; Power Source Voltage; Electrification - NEC MultiSync LCD1550ME Service Manual

3. Set adjustments

3.1. Measuring instruments to be used

The measuring instruments considered necessary for the adjustment of the LCD1550ME set are specified
below.
1) Equipment that can generate an output of the adjusted VG-819 unit or equivalent

3.2. Power source voltage

100 - 120V/ 220 - 240V ± 5%, 50/60Hz

3.3. Electrification

1) Make connections according to the mode intended for VG-819 cable setting.
2) Turn on the POWER switch of the VG-819 unit.
3) Connect an AC power cable to the unit under inspection.
4) Confirm that the vacation switch (seesaw switch) at the left side of the unit being inspected has been
moved to the "I" side, and turn the POWER switch ON at the right side of the front.
5) The LED of the unit under inspection is lit in amber. (In the middle of signal discrimination)
6) After the completion of signal discrimination, the LED is lit in green.
Note 1: When the POWER source switch is turned on for the first time, the initialization of EEPROM is
effected regardless of the ON/OFF position of the POWER switch. In this period (about 1
minutes), the POWER switch must not be moved to the ON or OFF position. Upon the
completion of the initialization, a normal screen is displayed. (If no signal input is entered, the
information OSM is displayed.) If the screen is not displayed for more than 5 minutes after the
electrification, however, this seems to have resulted from failure in the initialization of EEPROM.
Such a condition is regarded as NG.
Note 2: Connections for the connectors should be carried out always under the condition that the AC
POWER cord plug has been pulled out.

3.4. Input signals

Refer to Paragraph 3.6.1 for each adjustment item.

3.5. POWER ON and signal input

1) Turn on the vacation switch located on the side of the main unit (the power supply for the signal
generator turned off) and turn on the power circuit by pressing the POWER key on the front panel.
Confirm in this case that the LED is lit in amber. When the power supply is turned on for the first time
after the completion of PWB assembly, do not turn off the power supply for at least 10 seconds because
initialization is required to be performed.
2) Turn on the power supply of the signal generator and enter an input of Signal 1. Confirm that the LED is
turned from amber to green.
* If this LED is not lit in green at that time, it is regarded as a defective LED.
3) Prior to adjustments, execute the factory reset procedure without fail. The method of this action is
described below.
a) Display the SERVICE menu and adjust the cursor to the item of [FACTORY RESET].
b) Enter a signal 2 input of VGA 640x480(Solid all white pattern).
c) Press the (+) PLUS or (-) MINUS keys to execute the factory reset procedure.
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