(2-l) MAIN PWB ADJUSTMENT
(1)
(2)
(3)
(4)
(5)
Signal 1
(VGA350)
Horizontal Hold
Signal 10
(1024X768(76))
Receive signal
lO(all
"H").
(a)
(b)
(c)
(d)
[F-i
(g)
Adjust
VR852(5.14V
ADJ) so that the voltage across
TP43
and
GND on Adjustment jig (TP-A
@I
and
0)
is OV
±O.O5V.
Short SW46 on Adjusting jig (TP-A
@
and
@>
and adjust VR501
(H
HOLD
1)
so that there is one screen.
Open
SW46 on Adjusting jig (TP-A
@
and
0)
and check for
synchronization.
Receive signal
lO(all
"H").
Short SW46 on Adjustment jig (TP-A
@I
and
0)
and adjust VR502
(H
HOLD 2) so that there one screen.
Open SW46 on Adjustment jig (TP-A
@I
and
0)
and check for
synchronization.
Horizontal Raster Centering
Signal 12
(1024X768(76))
(a) Receive an all-black signal.
(b)
If
necessary, adjust
the brightness control so that the raster is
faintly illuminated.
(c)
If
necessary, press
the user control switch(SW101) and compress
the amplitude until both edges of the horizontal raster can be
seen. (Adjust
the HORIZONTAL RASTEP size about
27Omm)
(d)
Adjust VR552
so that the raster is within the following limits
space between bezel and raster right and left space difference
±2mm.
Vertical Linearity
Signal 6
(800x600(56))
Perform this procedure only necessary.If needed:
(a)
Receive a crosshatch pattern.
(b)
Adjust
VR401(V
SUB HEIGHT) so that the vertical screen size is
approximately
195mm.
(c)
Adjust
VR402(V
LIN) to obtain the best vertical linearity.
Vertical Sub Height
Signal 1
(VGA350)
(a)
Receive a crosshatch pattern.
(b)
Adjust the user control V POS
switches(SW107/108)
to center the
vertical screen position.
(c)
Use the V SIZE
switches(SW105/106)
to increase the vertical
screen size to the maximum size.
(d)
Adjust
VR401(V
SUB HEIGHT) so that the top and bottom horizontal
lines of the crosshatch pattern just meet the front bezel.
Side Pin
Signal 6
(800x600(56))
(a)
Turn the VR431 mechanical center.
(b)
Receive a crosshatch
pattern (with
outside border).
(c)
Adjust
th
e user control
switches (SW101,102,105,and
106) to obtain
the following picture size.
Vertical:
approx.
195mm
Horizontal:
approx.
260mm
(d)
Short SW43
on Adjustment j ig.(TP-A
@
and
@>
(e)
Push MEMORY RECALL
SWITCH(SW109)
for at least 2 seconds.
(f)
Release the short.
(g)
Adjust VR403 so that the vertical lines at left and right edges
of the screen are straight.
19
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