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[Deflection Circuit]
4. Centering
Adjustment Set the picture to the screen center.
purpose
Symptom when
The picture center is not in the right position.
incorrectly adjusted
Measuring
1. Supply a Centering signal (No.20).
1--l_n_s_tru_m_e_n_t_t------------il Note :
Set the 2-Pole Magnet in the condition that different catches are placed
Test Point
External Trigger
Measurement
Range
Input Signal
VG-814 (No.20)
Centering
one upon another on the magnet.
2. Press the "R" and "B" buttons on VG-814 to produce a Green monochrome picture.
3. Press the "TEST', "1 ", "1 ", and "8" buttons on the remote hand unit in that order
to set to the TEST 1 .1.8 mode.
4. Press the "RIB" button to select the item "H-WIDTH" and "V-WIDTH" in the
"DAC" adjustment mode.
5. Tum the Centering Magnet for the Deflection Yoke (Green) shown in Fig. 1 to adjust
the item "H-WIDTH" and "V-WIDTH" so that the top and bottom of the picture and the
middle of left and right edges (C, D, E and F) can· be seen in Fig. 2.
Input Terminal RGB Input Terminal
Note :
Confirm that the difference between C and D is 8mm at maximum and
PCB-DEFL V (Component side)
6[)VR452
6[)VR451
IC451
1 Omm at maximum with the difference between E and F. The position of
the screen center is 453mm away from the Top Board of the product and
570mm away from the Side Board.
6. Press the "R/B" button to select the "CONV" adjustment mode.
7. Set the items "2 HPCC" and "62 VPCC" to the center as shown in Fig. 2.
8. Set the initial data for "HSTA", "VSTA", "TILT', "SKEW", "HLIN" and "VLIN" to
"127" respectively. ("
<IC"
or"~"
button) ("HLIN" adjusts only G (Green).)
9. Select the item "VBOW' so that Line B in Fig. 2 is straight. (Adjust G (Green) only.)
1 0. Keep pressing the "RIB" button to select the "DAC" adjustment mode again.
11. Adjust the "V-POSI" so that the top and bottom edges of the picture shown in
Fig. 2 do not disappear and the picture is positioned almost at the center.
(" <IC"
or"~"
button).
12. Select the "H-POSI" and adjust so as not to position without returning at the left
and right edges in Fig. 2. ("
<IC"
or
"~"
button)
13. After adjustment, press "ENTER"
to
write the data into memory.
14. Press the "TEST' button to terminate the TEST 1.1.8 mode.
Note:
Adjust VR452 (V-WIDTH) when not being able to position the vertical
height to optimum.
15. Turn the Deflection Yoke (Green)
to
adjust so that Line A (a horizontal line at
the middle of the picture) is horizontal in Fig. 2.
Note :
Perform adjustment immediately so as not to change the magnet filed
when operating fixed screws for the Deflection Yoke.
16.
P~rform
adjustments with a centering magnet for the Deflection Yoke (Green)
shown in Fig. 1 so that the center mark of the picture (intersection point between A
line and Bline) is positioned at the center of the screen. Also adjust VR451 (V-UN)
alternately so thatthe clearance of C and D from the center is equal.
17.1nput Red and Blue in sequence. Adjust the Centering Magnet of each
Deflection Yoke for R (Red) tube and B (Blue) tube so that the center of the
picture and the inclination of A line against Green will be overlapped.
Note : The deviation of overlap shall be less than the width of A line and B line.
Centering Magnet
2-Pole Magnet
6-Pole Magnet
Screen Edge
A
Line
Deflection Yoke
CRT
4-Pole Magnet
Fig.1
Fig. 2
-20-
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