JVC AV-48P777/H Service Manual page 36

4.7.3.2 PREPARATION
Measuring
Item
instrument
SCREEN TILT Remote
adjustment control unit
H. POSITION / Signal
H. SIZE (coarse) generator
adjustment
Remote
control unit
RASTER Remote
CENTERING control unit
adjustment
R G B
L1 = 40mm
1-36 (No.YA455)
Test point Adjustment part
Conver Service
[3. Conver Off]
G DEF. YOKE
R DEF. YOKE
B DEF. YOKE
[PROJECTION UNIT]
TV-Micro Service
[1. Adjust]
D005 : H. SIZE
D020 : H. CENT
Conver Service
[3. Conver Off]
G CENTERING
magnet
R CENTERING
magnet
B CENTERING
magnet
[PROJECTION UNIT]
mechanical
center
R G B
L2 = 45mm
Description
• Confirm correct FOCUS adjustment.
(1) Enter Conver Service [3. Conver Off].
(2) Select crosshatch pattern with [INPUT] key.
(3) Make a green single color.
NOTE :
When making a single color, while adjusting of
one CRT, put the cap on other lens.
(4) Temporarily secure the G deflection yoke to the top
of the neck and adjust the tilt of the deflection yoke
so that the horizontal line at the center becomes flat.
After adjustment, fasten the temporal screw.
(5) Adjust the tilt of the R and B deflection yokes in the
same manner as for G.
NOTE :
Make sure that the adjustment of CRT FOCUS is
optimized at the center and at the fringe of the
center in turn. If the proper adjustment has not
been done, adjust FOCUS VR again.
(1) Receive NTSC circle (or crosshatch) signal.
(2) Switch off the convergence circuit.
(3) Enter TV-Micro Service [1. Adjust].
(4) Make a green single color.
NOTE :
When making a single color, while adjusting of one
CRT, put the cap on other lens.
(5) Select <D005> (H. SIZE) and shorten the level until
and perpendicular amplitude of vibration with until
the blanking in Left and Right and on either side can
be seen.
(6) Select <D020> (H. CENT) and adjust horizontal
position to make the screen center and signal center
same.
(7) Select <D005> and adjust horizontal size to make
screen picture approx. 92% of H-SIZE.
(8) Press [MUTING] key to memorize the set value.
(9) After adjustment, switch on the convergence circuit.
NOTE :
Refer to the FLOWCHART OF ADJUSTMENT for the
way to switch off/on the convergence circuit.
NOTE :
Carry out after finishing adjustment of H. POSITION and
H. SIZE.
(1) Enter Conver Service [3. Conver Off] and select
crosshatch pattern with [INPUT] key.
(2) Adjust G CENTERING magnet to make horizontal
and vertical line center as mechanical center of
screen.
(3) Red and blue color too, are reflected by it.
(4) Using R CENTERING magnet and B CENTERING
magnet, adjust for the line of the red(L1) and the
blue(L2) to become the position of the left figure.
NOTE :
Vertical center position of the red and blue are the
same as green.