Adjusting The Left/Right Distortion, Picture Width, Picture Position; Right) And Vertical Linearity (All Preset); Adjusting The Dbf Amplitude And Phase - NEC DPro2070SB Service Manual

2.4.3.3 Adjusting the left/right distortion, picture width, picture position (LEFT/RIGHT)
and vertical linearity (all preset)
(1) Set DOWN/UP of the user mode to 50%.
<Setting in the factory mode with the following steps>
(2) Adjust the vertical size to approx. 297mm, and the vertical position to the approximate
center.
(3) Select LINEARITY (VER.) and VERTICAL BALANCE with OSM, and adjust so that the
vertical linearity is equal at the very top of the picture, at the very bottom of the picture,
and at the center of the picture.
(4) Select SHORT/TALL and DOWN/UP with OSM, and adjust the vertical width and vertical
position to the specified values using (-) (+) buttons.
(5) Select IN/OUT, ALIGN, PCC CENTER, TOP and BOTTOM with OSM, and adjust the verti-
cal line at both side of the picture to the straight line using (-) (+) buttons.
(6) If the left and right distortions differ, select LEFT/RIGHT (PIN VAL), TILT, TOP-BALANCE
and BOTTOM-BALANCE with OSM, and adjust so that the distortions are visually bal-
anced.
(7) Select LEFT/RIGHT with OSM, and adjust the horizontal raster position to the center of the
picture using (-) (+) buttons.
(8) Select NARROW/WIDE with OSM, and adjust the horizontal raster width to the value given
in the adjustment list using using (-) (+) buttons. (Refer to 2.5.1.10 Adjustment value list.)
* Note (1) PCC SINE, LEFT/RIGHT (PIN VAL) and PCC CENTER are used only for touch
up.
Note (2) The picture position and distortion must be within the ranges given in the
picture performance inspection items. (Refer to 2.5.1.8 Picture distortion.)
2.4.3.4

Adjusting the DBF amplitude and phase

(1) Connect the oscilloscope to the lead of R7A2 (SG702 side) on PWB-MAIN and to one of
the signal outputs for the signal sources full R, G, B (VIDEO).
(2) Set OSM to the select picture of HFOCUS (DBF-H-AMP) in FACT 1, and using (-) (+)
buttons adjust the horizontal parabola wave amplitude (image area) to the value given in
the list of adjustment values. (Refer to 2.5.1.10 Adjustment value list.)
Vertical parabola wave
Image signal 1V
DBF-V-AMP adjustment
2 - 10
Measure
the center.
DBF-V-AMP