4.7.4 FOCUS & BEAM SPOT ADJUSTMENT
Measuring
ItemTest pointAdjustment partDescription
instrument
FOCUS & BEAM Signal R Def. yoke (DY)(1) Receive NTSC cross-hatch signal.
SPOTgeneratorG Def. yoke (DY)(2) Select FULL mode with [ASPECT] key.
adjustmentB Def. yoke (DY)(3) If the picture tilted, adjust the R, G and B DY position
Similar [PROJECTION UNIT]to mark straight horizontal line.
adhesive
LENS FOCUS
(Securing R LENS FOCUS screw
(1) Makes a red single color.
adhesive)G LENS FOCUS screw
NOTE :
B LENS FOCUS screw
When making a single color, while adjusting focus
[PROJECTION UNIT
of one CRT, put the cap on other lens.
(LENS ASS'Y)]
(2) By turning the LENS FOCUS screw (in LENS ASS'Y),
for optimum focus at the screen center. Check for
4 pole magnet
absence of difference in the peripheral focus. If the
2 pole magnet
peripheral focus is poor, slightly shift the center focus
[PROJECTION UNIT
to obtain overall balanced focus.
(R / G / B CRT neck)]
(3) In the same manner, produce green and blue single
color and adjust their respective focus.
R FOCUS VR
(4) After adjustment, it fixes a screw.
G FOCUS VR
NOTE :
B FOCUS VR
There is not a difference in the focus in the top and
[FOCUS PACK]
the bottom, on either side, in the diagonal.
When the difference of the focus is big, it removes
DEFLECTION
YOKEa main lens, and it puts a washer between the main
LENS FOCUS CENTERING lens and the coupler and it adjusts it.
SCREWMAGNET
BEAM SPOT
MAGNET
LOCK(5) Receive NTSC dot pattern signal.
(6) Makes a red single color.
OFF(7) Turn the R FOCUS VR clockwise from just focus
point, to set the dot diameter equal to O30mm.
LOCK
(8) Turn the 4 pole magnet of the projection unit CRT
4 POLE 2 POLE neck and make beam shape round as circle on the
MAGNET MAGNET
position between center and both ends of the screen.
Note:(9) Adjust the R FOCUS VR for optimum focus at the
MAGNET LOCK is added.position indicated in the figure.
Turn to right to LOCK, turn to left to OFF.(10) In the same manner, adjust for the green and blue
single color focus.
PROJECTION UNIT & LENS ASS'Y
(11) Turn the 2 pole magnet of the CRT neck to minimize
expansion of the dots.
(12) Secure the 4 and 2 pole magnets with similar
adhesive.
CRT FOCUS
(13) Receive NTSC cross-hatch signal.
(14) Makes a red single color.
(15) Adjust the R FOCUS VR for optimum focus at the
position indicated in the figure.
(16) In the same manner, adjust for the green and blue
single color focus.
BEAM SPOT & FOCUS adjustment point
red
bluegreenblue
CRT FOCUS adjustment point
1-52 (No.52168) |
ACEC
