Hitachi 36UX52B\CZ77 Service Manual page 28

M7LXU
THE MICROSCOPE
Reference
c-1 'SWITCH
" x 80 MICROSCOPE
diameter = 0.37
xl50T
Fix coil to CRT side of microscope. Set it upside down and measure it. Check that beam moves to the right and left
equally in quantity. Be careful at assembly that core does not tilt because upward (downward) magnetic field by
coil moves the beam to the right (left) or type MS-50X microscope of KANSAI DENKI.
l-3 Purity Adjustment
(This adjustment method applies to purity
adjustment by hand operation.)
(1) Use an artificial magnetic field and set the field
strength as follows,
*Magnetic field in CPT axis direction: 0 Gauss
*Magnetic field which is vertical to CPT axis:
U.S.A., Hawaii, Panama, Guam
Bolivia, Peru, Universal . . . , . .0.3 Gauss
Canada . . . . . . . . . . . . . . . . . .0.15 Gauss
Taiwan . . . . . . . . . . . . . . . . . . .0.37 Gauss
(The direction of the magnetic field should be
from the left side to the right side of the CPT
screen as you face it.)
(2) Adjust Focus coarsely according to item 2.
(3) Adjust Convergence coarsely according to item
1-4 and l-5.
(4) Receive Circle Pattern signal and check that
Contrast and Brightness are maximum.
(5) Receive magenta signal. When the magenta sig-
nal is not available, short-circuit between the
base and emitter of Q855 and set to magenta.
(6) .Press DY fully against CPT funnel and turn the
purity magnet so that the vertical magenta band
comes to the center of the picture (Fig. 1-3-1).
Check that color uneveness of both sides are
approximately equal at this time.
The openings of the purity magnet should be
symmetric (Fig. 1-3-2).
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