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2-4) Adjustment of Vertical Linearity, Vertical Height, and Vertical Bias
(V. LINEARITY, V. SIZE, and V. BIAS)
(1) V. LINEARITY
During reception of the crosshatch pattern of Signal 1 (44.8 kHz, 60 Hz), use VR404
(V. LIN (S)) fully to the right.
(A) Top/Bottom Adjustment
Adjust VR403 (V. LIN (C)l so that the top and bottom linearity is equal.
(B) Top/Center/Bottom Adjustment
a) If the center is elongated, rotate VR404 slightly to the left until the elongation is
corrected (but do not rotate it fully to the point where top elongation occurs).
b) Adjust V R403 so that the top and bottom linearity is equal.
(C) Confirmation
a) Repeat steps a) and b) of (B) until the linearity is approximately 6%.
b) Receive Signal 7 (31.5 kHz, 70 Hz, 350 lines). and check that the linearity is within
8%.
(D) Compensation
If the linearity is not within 8%, receive Signal 1.
For top elongation:
Rotate VR403 slightly to the right until top elongation is elimi-
nated, then perform (B) and (C).
For bottom elongation: Rotate VR403 slightly to the left until top elongation is elimi-
nated, then perform (B) and (C).
For center elongation: Rotate V R404 slightly to the left until center elongation is
corrected, then perform b) and c) of (B).
(E) Confirmation
Based on the reception of Signals 1 and 7, check that the linearity is within 8%.
(2) V. SIZE
Set the MANUAL switch (SW802) to ON, and perform centering of VR3 (V. SIZE).
a)
Receive Signal 1 (60 Hz), then use VR440 to adjust Signal 1 to 190mm.
b)
Receive Signals 2, 4, and 9, then check that the back rasters are practically filling the
screen.
c)
Set the MANUAL switch to OFF.
Receive Signal 6 (60 Hz, 480 lines), then use V R441 to adjust Signal 6 to 175mm.
d)
Receive Signal 4, and check that it is 161 mm
±
5mm.
Receive Signal 7, and check that it is 170mm
±
5mm.
Receive Signal 8, and check that it is 180mm
±
5mm.
*When receiving Signal 8, be sure to set V. MODE to LOW.
(3) V. BIAS
Receive Signal 1, then use VR402 (V. BIAS) to adjust Signal 1 to 13.5V
±
O.2V.
The measurement point is the VDY 3 terminal of the deflection yoke (the terminal con-
nected to the yellow lead wire of the deflection yoke).
Set V. POSITION (VR5) to the position where the screen is centered.
Set V. SIZE (VR3) to the center position.
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