Beam Landing Rough Adjustment - Sony Multiscan GDM-2036S Service Manual

I
BRIGHTNESS
I
control ......................... Center
@ Connect the osciloscope probe and obseIVer the
wavefonn at TP2 (KG) on the C board.
®
Tum RV20l on the A board to adjust the video
level to 40 Vp-p.
@ Adjust the pedestal level to 20
±
1 V by RV 405 on
theA board.
l
video level
~--+--
_____
J
------------------------oV
Video level
Pedestal level
+40
±
0.5 [Vp-p]
+20
±
1 [V]
Fig. 6-3-2
®
Connect the oscilloscope probe and obseIVe the
wavefonn at TP (G 1) on the C board.
--------------------oV
G1 level
,..------------, --- - 65
±
2V
Fig. 6-3-3
2) Rough adjust ..... m __ e ...... l).t ____ ----,
<D
Set the !CONTRAST ! control to minimum.
®
Adjust the SCREEN VR so that the back raster
disappears
@ Tum R.BKG (RV404) and B. BKG (RV406) to
adjust the white balance for the dark level.
®
Set the! CONTRAST! control to maximum.
@ Tum R.DRV (RV101) and B. DRV (RV301) to
adjust the white balance for the dark level.
®
Repeat steps
<D
through @ to adjust the white bal-
ance. (This adjustment need not to be precise.)
GDM-2036S
6-3-2. Beam landing rough adjustment
Note: The following beam landing adjustments are not
required for servicing CRTs (ITC) supplied by
SONY.
1) Input a full-green signal. (100 IRE green flat field signal
pattern'f-:)
=-=-===--::-=
2) Set the
I
CONTRAST ! control to minimum.
3) Face the monitor to the east or west.
4) Adjustment the SCREEN (G2) VR to obtain the optimum
brightness.
5) Move the deflection yoke backward.
6) Adjust the purity magnets so that the green is positioned
at the center of the screen. (See Fig. 6-3-4 and 6-3-6.)
7) Move the deflection yoke forward and adjust it so that the
entire screen becomes green.
8) adjust the tilt for the deflection yoke.
9) Fix the deflection yoke lightly.
10) fix the neck twist coil as shown in Fig. 6-3-5.
l
(
(
R
G
(
B
)
(
)
(
Fig. 6-3-4
Neck
twist
coil
Fig. 6-3-5
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