Sharp SX76NF8, Руководство по обслуживанию

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7
7-1
7-2
SX76NF8
CHECKING FUNCTION OPERA
TION (TEXT MODE)
NO
1 2
ADJUSTMENT POINT
TEXT TEXT k
e
y
ADJUSTMENT CONDITION / PR
OCEDURE
(1) Receiv
e
E-12ch signal.
(2) Press
TEXT k
e
y
to chec
k change
TEXT mode /
SPLIT SCREEN mode /
TELETEXT mode / MIXED
mode
.
(1) Receiv
e
E-12ch signal.
(2) Press HALF P
A
GE, HOLD
, REVEAL, CLOCK, CANCEL,
LIST
, INDEX, and RESET k
e
y
to chec
k whether each
eff
ect is OK or not.
(3) Select
V
-SIZE, Press
V
o
lume Up/Do
wn k
e
y
to chec
k
whether the
V
-SIZE eff
ect is OK or not.
W
A
VEFORM OR O
THERS
PURITY AND CONVERGENCE ADJUSTMENT NO
1
ADJUSTMENT POINT
D
Y
location (YPB)
adjustment procedure
ADJUSTMENT CONDITION / PR
OCEDURE
(1)
T
u
rn
on the set to mak
e coarse adjustments to the CR
T
cut-off
, white balance
, etc.
as w
e
ll as the pur
ity static
con
v
e
rgence
.
(2)
T
o
impro
v
e the pur
ity adjustment accur
acy
, perf
o
rm
coarse adjustments to the H-SIZE/center
,
V
-SIZE/LIN
and side pin.
(3) Enter the video mode to set the beam current to the
standard v
a
lue belo
w
using the screen
VR.
(Or it is
possib
le to use the noise signal of an empty channel.)
Age the set f
o
r more than 30 min
u
tes with the f
o
llo
wing
current. Standard v
a
lue of beam current:
1000
µ
A
±
200
µ
A
(4) Receiv
e
the monoscope signal to adjust the cut-off
v
o
ltage
.
Consequently
, adjust the contr
ast, color le
v
e
l and then
set the beam current to the abo
v
e
standard v
a
lue
.
Age the set f
o
r more than 2 min
u
tes
.
Note:
If other adjustments betw
een step 3 and 4 (the
area mar
k
ed b
y
*) aff
ect the conditions of the beam
current, complete the adjustment f
o
r each point within 2
min
u
tes
, which is not included in the aging time).
* P
e
rf
or
m the adjustments in an ear
th magnetism room
with Bh and Bv set to 0.20G and -0.50G respectiv
ely
.
(5) Under the abo
v
e
conditions
, mo
v
e
D
Y
and the pur
ity
magnet to mak
e the f
o
llo
wing adjustments
.
- 1.
Set
YPB of D
Y
to 2.5 mm tempor
ar
ily
.
- 2.
Adjust the center to A r
ank b
y
mo
ving the pur
ity
magnet. - 3.
Inser
t a tempor
ar
y w
edge to balance D
Y
v
e
rtically
.
- 4.
Mo
v
e
D
Y
bac
k and f
o
rt
h to set L and R to the
standard v
a
lue belo
w
. (Apply to the pur
ity correction
magnet if L and R are imbalanced.) - 5.
Correct the center to "AB r
ank" if the L and R are
imbalanced. - 6.
After making sure the landing is proper
ly positioned,
fix D
Y
.
Note:
Preliminar
y adjustments are made to set L and R
to the standard v
a
lue after con
v
e
rgence adjustment.
Standard v
a
lue:
-25
µ
m
±
5
µ
m at the 90 mm point
W
A
VEFORM OR O
THERS
Pur
ity adjustment Aging f
or more
than 2 min
utes
Aging f
or more than 30 min
utes
Raster output
PURITY AND CONVERGENCE ADJUSTMENT (Contin
ued)
NO
2
ADJUSTMENT POINT
P
e
ri
pher
al landing
correction
ADJUSTMENT CONDITION / PR
OCEDURE
(1) Place the set in a magnetic room with the hor
iz
ontal line
and v
e
rtical line set to 0G and - 0.5G respectiv
ely
, and
receiv
e
red monochrome
.
(2) After a complete e
x
ter
nal;
demagnetization, gener
ate a
hor
iz
ontal magnetic field of
±
10000nT (0.1G) and apply
the pur
ity correction magnet to the m
u
lti-colored areas
.
Chec
k b
lue monochrome equally
.
(3) Retur
n the magnetic field to z
e
ro and perf
or
m a
complete demagnetization.
(4) Gener
ate a re
v
e
rse hor
iz
ontal magnetic field, chec
k red
and b
lue monochrome and apply the magnet to m
u
lti-
colored areas
.
(5) After correcting the magnet in step 4, chec
k the re
v
e
rse
magnetic field again.
3
D
irectional toler
ance
chec
k
(1) Place the set in a magnetic room the hor
iz
ontal line and
v
e
rtical line set to 0.2G and - 0.5G respectiv
ely
, and
receiv
e
red monochrome
.
(2) Mo
v
e
the set from side to side at the f
our points of the
compass to chec
k the status of the m
u
ltiple colors and
ensure L and R are w
e
ll-balanced.
(3) Apply to the pur
ity correction magnet if L and R are
imbalanced.
(4) If the magnet w
as applied in step 3, chec
k from other
directions equally
.
W
A
VEFORM OR O
THERS
4
Con
v
e
rgence
adjustment procedure
(1) Set the video adjustment le
v
e
l to nor
mal, and receiv
e
a
crosshatch patter
n
.
(2) Center con
v
ergence adjustment
Super
impose RGB of the screen center area f
or
optimization, b
y
using the 4 pole and 6 pole of the pur
ity
magnet.
Super
impose the red and b
lue b
y
the 4 pole
magnet, the g
reen and magenta b
y
the 6 pole magnet.
As f
o
r v
e
rtical lines
, a
v
oid setting the red line to the left,
b
lue to the r
ight.
(3) P
e
ri
pher
al con
v
ergence adjustment
Combine the f
o
llo
wing item with the f
err
ite sheet to mak
e
optimal adjustments
.
1.XV cross
Rotate the v
a
ri
ab
le coil on the D
Y
PWB f
o
r
optimization.
2.YH cross
Adjust with the v
o
lume on the D
Y
PWB
.
If per
ipher
al PQH is o
v
ersiz
ed, correct with the f
err
ite
sheet or b
y
shaking slightly
.
3.XH, YV
Use the dedicated correction str
ip to correct them.
YH
YV XV