NEC JC-1531 VMA-2, Service Manual

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(10) Screen Position,Size,Side Pincushion,Digital control
(10-l) Screen position and size Signal 1,2,3,4,5,6,7,8,9
* Independent adjustments of each signal
(a) For signals 1 to 9(except signal 6), check that the screen
position and size fall within the following limits.
Screen Size Horizontal: 26Omm±2mm
Vertical : 195mm±2mm
Screen Position Space between bezel picture edge
Top and bottom space difference
:
±2mm
Right and left space difference
:
±2mm
If the screen position and/or size dose not fall within the above
Iimits,carry out the following readjustment procedure.
Receive a crosshatch pattern(with border) of the signal in
question.
Short SW41 and SW42 on adjustment jig.(TP-A and
Adjust the screen position and size to within the limits listed
above using the user control switches(SWlOl-108).
Push MEMORY RECALL SWITCH(SW109) for at least 2 seconds.
If more than one signal requires readjustment, repeat steps (b)
I
through (e).
Release the short.
(10-2) Side Pincushion Signal 1,6,7,9
* Repeat the following procedure for each of the 4 signa
(a) Receive a crosshatch pattern.
(b) Check to if th e side pincushion distortion is within
If readjustment is necessary,carry out the following
procedure starting with step (c).
If no readjustment is required, check the next signa
(c) Short SW41 on adjustment j ig.(TP-A and
S.
±1.
0mm.
adjustment
(d) Switch level 2 and check that the user level LED lights.
(e) Adjust V SIZE DOWN(SW106) and V POS DOWN(SW108) so that the
vertical lines on both sides of the screen image are straight.
(f) Return to level 1.
(g) Release the short.
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