NEC MultiSync 3D JC-1404HME Service Manual page 22

4. Horizontal Hold Adjustment
5. Horizontal Linearity Adjustment
6. Side Pin Adjustment
This adjustment is user control to adjust with the signal 3~12.
Th is condition is memorized and the signal pattern is reversed cross hatch.
(1) Setting
BRIGHT VR
: Max
CONTRAST VR : Min
(2) Procedure of adjustment
1 Short TP151 and TP152.
2 Receive Signal 3 (CGA).
3 Adjust so that the screen is in the center of the back raster with User Control Horizontal
Position Switch.
4 Adjust so that the horizontal screen size is 240mm±2mm with User Control Horizontal Size
Switch.
5 Adjust so that vertical position of the screen is in the center of CRT with User Control Vertical
Position Switch.
6 Adjust so that the vertical screen size is 180mm±2mm with User Control Vertical Size Switch.
7 Push the Memory Recall Switch. (over 5 sec.)
8 Receive Signal 4 (MDA).
9 Turn on the Mode Switch.
10 Perform the shown above 3~7.
11 Turn off the Mode Switch.
12 Receive Signal 5 (EGA).
13 Perform the shown above 3~7.
14 In the same way, perform the shown above 3~7 with signal 6~12.
However, adjust so that the horizontal screen size is 250mm±2mm and the vertical screen size
is 187mm±2mm with signal 10 (8514A).
15 Remove the test pin short after confirm that the adjustments with signal 3~12 are finished.
16 Confirm by watching that the screen size position is correct on the all mode.
If not, re-adjust on the mode only and re-confirm on the all mode.
3-2) VIDEO CRT PWB (Adjustment of Video Amplitude and White Balance)
NOTE: Check that the video signals are as shown below before performing the main adjustment. In
particular, for L VG-1603, the video signal output level varies according to the signal pattern,
so check the level with the signal to be adjusted.
Video : Analog 0. 7Vp-p
Synchronizing : H.V Separate TTL level
(1) Initial Setting of Adjustment VRs
VR901 ~903 GAIN VR
VR904 SUB CONT. VR
BIAS VR
Fully counterclockwise (MIN)
Fully clockwise (MAX)
Fully clockwise (cathode voltage rising
VR906, 908, 910
VR905, 907, 909
SCREEN VR
SUB BRIGHT VR : Mechanical Center
Fully counterclockwise (MIN)
(2) Video Contrast Adjustment (Window pattern)
a) GAIN VR adjustment
1 Receive the window pattern (the video area of 1/3~1/2H x 1/~V in which there is no ABL
even with contrast at maximum is preferable_) (Signal 12)
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