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Adjustment; How To Select The Factory Adjustment (Factory) Mode; Selecting With Front Panel Switches; Adjustments Before Aging - NEC DPro2070SB Service Manual

Crt display nec-mitsubishi electric visual systems corporation september 2002
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2.4

Adjustment

2.4.1

How to select the factory adjustment (FACTORY) mode

2.4.1.1

Selecting with front panel switches

(1) Turn the power ON while holding down EXIT button.
(2) After step (1), release EXIT button after one to two seconds.
(3) Confirm that 255 is displayed for the counter of FACT DATA on OSM display.
(4) Set to 05 with (+) button.
(5) When SELECT S/B MODE button is pressed, the factory mode will be entered.
This factory adjustment mode is entered with the above steps.
*The factory adjustment mode remains valid even after the power is turned OFF.
Note that steps (3) to (4) must be carried out within ten seconds. If ten seconds are exceeded,
the mode will return to the user mode.
<Returning to the user mode from the factory mode>
(1) Display FACT DATA on OSM picture with the group selection.
(2) Set the counter value to 010 with (-) (+) buttons.
(3) When SELECT S/B MODE button is pressed, the mode will return to the user mode.
2.4.2

Adjustments before aging

Adjustment item
Status
Before aging
indicator
2.4.2.1

Adjusting the high voltage and high voltage protector

Adjustment item
Status
High voltage and high
indicator
voltage protector
(Timing No. 12 (106.25 kHz/85 Hz, 1600x1200) SYNC signal is only input)
(1) Turn the monitor power OFF and connect a high voltage indicator to the anode of CRT
before turning the monitor power ON.
(2) Select "FACT DATA***" on OSM and set to 250 using (-) button before pushing the SE-
LECT S/B MODE button.
(3) Select HVADJ (HV-ADJ CAUTION) on OSM to adjust the high voltage to 27.0kV±0.5kV.
(4) Select XPCAL (XPRO-CALIBRATION) on OSM and turn the screen VR all the way down
counterclockwise before adjusting the high voltage to 31.0kV±0.5kV by manipulating (+) (-
) buttons.
(5) With SELECT S/B MODE button pushed, the protector operation point is set, causing the
high voltage to return to 27.0kV±0.5kV.
(6) Rotate the screen VR so that OSM can be confirmed.
(7) Select XPROT (XPRO-TST CAUTION) on OSM by the manipulation shown above and turn
the screen VR all the way down counter-clockwise.
(8) Raise the voltage manipulating (+) button and make sure that the high-voltage protection
circuit gets activated at 31.0kV±0.5kV.
Adjustment mode/set
Adjustment mode/set
2 - 7
Imput signal/pattern
The only the sync. signal of
No. 12:106.25kHz / 85Hz, 1600x1200
Imput signal/pattern
The only the sync. signal of
No. 12:106.25kHz / 85Hz, 1600x1200

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