Adjusting The Landing (Itc/4 Corner Purity Adjustment); Adjusting The Picture Size, Position And Distortion, Dbf Amplitude And Phase; Adjusting The Picture Inclination; Adjusting The Back Raster Position - NEC DPro2070SB Service Manual
Crt display nec-mitsubishi electric visual systems corporation september 2002
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2.4.2.5
Adjusting the landing (ITC/4 corner purity adjustment)
Adjustment item
Status
landing
indicator
(1) Input the timing No. 12 (106. 25kHz/85Hz, 1600x1200) full green signal.
(2) Turn OFF the monitor power to carry out hand degaussing.
(3) Select GLOBAL SYNC (TL) on OSM.
(4) Adjust to the best condition using (-) (+) buttons. Here, make sure that the adjusted value
is within the range of OSM display value = 38h (56) to C6h (198).
(5) Carry out similar adjustment for TR/BL/BR (GLOBAL SYNC).
Note) When the substrate is replaced at the time of repair, set TL/TR/BL/BR to the values
before replacement before carrying out adjustment.
(6) Input the timing No.12 (106.25kHz/85Hz, 1600x1200) full white signal.
2.4.3
Adjusting the picture size, position, distortion, DBF amplitude and phase
The manual adjustment methods are explained below. The adjustments are executed in the
factory adjustment (factory) mode.
Adjust the picture size to the value indicated in the list of adjustment values.(Refer to 2.5.1.10
Adjustment value list.)
Adjust the distortion to the value indicated in the picture performance inspection item. (Refer
to 2.5.1.8 Picture distortion.)
2.4.3.1
Adjusting the picture inclination
Adjustment item
Status
Picutre inclination
indicator
Set OSM to ROTATE, and using (-) (+) buttons, set the raster inclination to be horizontal to
the CRT face surface.
2.4.3.2
Adjusting the back raster position
Adjustment item
Status
Back raster position
indicator
(1) Set BRIGHTNESS to 100% to show the back raster.
(2) Select LEFT/RIGHT and DOWN/UP, adjust the horizontal back raster position to the center
of the bezel using (-) (+) buttons.
At this time, the raster width should be |L1-L2| ≤ 2.0mm.
OWN
H2-OW-**
(Initial data file name)
Adjustment mode/set
Adjustment mode/set
Factory
Adjustment mode/set
Factory
L1
2 - 9
VER
2.*.**
Imput signal/pattern
No. 12:106.25kHz / 85Hz, 1600x1200
Full green
Imput signal/pattern
No. 12:106.25kHz / 85Hz,1600x1200
Crosshatch with frame
Imput signal/pattern
No. 12:106.25kHz / 85Hz, 1600x1200
Only the sync. signal input
Back raster
L2
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