15
VT-G14
VT-G21
a
b
Left
Right
Beam landing equally outwards.
Left
Right
Beam landing shifted to right.
Left
Right
Beam landing shifted to the left.
Ë
Ë
Ë
Ë
Ë
PURITY ADJUSTMENT
1. PURITY ADJUSTMENT
1. First of all, let a beam current of over 700
µ
A flow
in the set to warm it up for 30 minutes or longer.
(over 400
µ
A for VT-G14).
2. Keep the purity magnet in the zero magnetic field
in advance. Roughly adjust the static conver-
gence.
3. Receive the green-only colour signal. Adjust the
beam current to about 770
µ
A. (about 500
µ
A for
VT-G14)
4. Degauss the cathode ray tube enough with the
degaussing coil.
ADJUSTMENT
Eastward magnetic field specified
1) Observe the beam landings “a” and “b”, as
shown in
Fig. A, through a microscope. Ad-
just the landings as specified.
2) If the right and left landings are equally out-
ward as shown in
Fig. B, move the deflection
yoke forward.
3) If the right or left landing is shifted to the right
or to the left, as shown in
Fig. C and Fig. D,
adjust the opening angle of the purity magnet.
4) Make sure the right and left beam landings are
just as specified about the screen center. Now
check the cathode ray tube corners.
Be sure that all the landings are at rank “B”.
5) If any other colour appears on the screen,
move the deflection yoke back and forth.
LANDING ERROR
»
Outward: Move the deflection yoke forward.
»
Inward: Move the deflection yoke backward.
6) Receive the monoscope pattern signal.
RASTER ROTATION
7) Adjust the raster rotation to “0” eastward.
»
Adjustment error : 0 ±2 mm
8) Tighten up the deflection coil screws.
»
Tightening torque : 11±2 kg
Note : Each time the single-colour button is
pressed, the screen colour changes as
follows.
Fig. A
Fig. B
Fig. C
Fig. D
Green-only
screen
Red-only
screen
Single-colour
screen cleared
Blue-only
screen
Summary of Contents for VT-G14
Page 69: ...71 VT G14 VT G21 70 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H BLOCK DIAGRAM OF TV SECTION 1 ...
Page 88: ...98 VT G14 VT G21 6 5 4 3 2 1 A B C D E F G H BLOCK DIAGRAM OF VCR SECTION Ë Y C BLOCK DIAGRAM ...
Page 95: ...109 VT G14 VT G21 108 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H PWB A MAIN Unit Wiring Side ...