Sharp 29A-SX1, Service Manual

Page: 15 / 86

15
29A-SX1
29A-SX5
29A-SX8
SX-68JF200
15
PURITY ADJUSTMENT
NO
.
Adjustment par
t
Adjusting procedure and conditions
W
a
v
e
fo
rm
and others
1
Purity adjust- ment
1
Select the g
reen monocolour screen with the
remote controller
, and set the beam current of
1.5mA with the contr
ast control.
2
Sufficiently degauss CR
T with the degusing coil.
Note
:
F
or the adjustab
le magnetic field, ref
er to
the job instr
uction sheet.
The adjustab
le magnetic field is as sho
wn
page 9.
3
The pur
ity magnet m
ust be pre
viously set at
the 0 magnetic field, and the con
v
ergence m
ust
be adjusted to be rough. With P-MG, adjust it to the center - r
ank A.
4
Obser
ving the points a and b of Fig.
1-1 with
the microscope
, mo
v
e
D
Y
f
ore and aft to set
the landing at the point (Rank A) of 10
µ
m.
4
If the a/b balance is poor
, compensate it to the
center “Rank
AB”.
5
Align it to z
ero
, k
eeping the r
aster rotation in
the east direction.
6
Tighten the deflection coil f
astening scre
ws
.
Tightening torque: 108N
±
20N (11kgf
±
2kgf)
7
Chec
king the CR
T cor
ner area, bond the mag-
netic sheet to set the landing at Rank A f
or com-
pensation.
Note
:
Apply the adjustment after aging with the beam current 1,500
±
50
µ
A or more f
or 30
min
utes or more
.
Note :
Select the ser
vice mode, and press the
monocolour k
e
y of R/C f
or process
, and the
monocolour screen (g
reen) will be selected.
Note
:
After adjusting the con
v
ergence
, perf
or
m
rough adjustment so that a/b gets to 10
µ
m.
*
E
v
e
ry
push of the monocolour k
e
y changes the
screen as f
ollo
ws
.
ab
A–B= 20
µ
m
AB
B–A= 20
µ
m
AB
Fig. 1-1
Fig.
1-2 Rank A’
CR
T RIGHT
Fig.
1-3 Rank A’
CR
T LEFT
Ev
en with
TEXT k
e
y or
“R.G.Cy”
k
e
y,
it can be directly s
witched to each
monocolour screen. With "Y" k
e
y,
it can be s
witched
WHITE screen.
Monocolor
screen
GREEN
Monocolor
screen
BLUE
Monocolor screen
release
Monocolor
screen
RED
P
e
ripher
al pur
ity
adjustment
2
1
After
YPB adjustment of D
Y
, receiv
e the cross-
hatch, and coarsely adjust
Yh and
Yv b
y
s
wing-
ing D
Y
. (Fix it with the w
edge within 30 sec-
onds
.)
2
In the monocolour screen (g
reen), set the beam
current at 1,400
µ
A.
3
In Bh=0 and Bv=
“Ref
er to the f
actor
y setting
and geomagnetic adjustment b
y
model (ref
.)”,
v
e
rify that the landing in the cor
ner area is pr
ac-
tically at the r
ank A.
If it is de
viated, bond the
Pu compensation Mg f
or adjustment.
Note :
Set to natur
al magnetic field.