Sharp 21XF30, Руководство по обслуживанию

Страница: 11 / 58

11
21XF30
21XF50
11-1
11-2
No.
Adjusting point
Adjusting pr
ocedure/conditions
W
a
vef
orm and other
s
SUB-TINT (I2C B
US CON-
TR
OL)
1
.
Receiv
e the "NTSC3.58 Colour Bar" signal
through A
V
in.
2
.
Connect the oscilloscope to
TP853 (Pin (5) of
P882) BLUE-OUT
.
»
Range
: 100mV/Div
. (A
C)(Use Probe 10:1)
»
Sw
eep time
: 10
µ
sec/Div
.
3.
Call the "SUB-TINT" mode in ser
vice mode
. Ad-
just the "SUB-TINT" b
us data to obtain the w
ave
-
fo
rm
sho
wn as Fig.
11.
4.
Clear the SER
VICE mode
.
1
Fig. 10
NTSC CHR
OMA ADJUSTMENT
No.
Adjusting point
Adjusting pr
ocedure/conditions
W
a
vef
orm and other
s
BEAM PR
O-
TECT
OR
1.
Receiv
e "Monoscope P
atter
n" signal.
2.
Set CONTRAST MAX.
3.
Set BRIGHT MAX.
4
.
Dur
ing the Collector & Emitter of Q883/5/7 shor
t,
mak
e sure the protector ON and s
witch to standb
y
mode
.
1
* Select one of Q883/5/7 to do
each shor
t test.
H,
V
PR
O
TEC-
TO
R
1.
Receiv
e "Monoscope P
atter
n" signal.
2
.
Connect output of Bias Bo
x to D607 cathode
(R606 side).
3
.
Set v
oltage of Bias Bo
x to 18V and mak
e sure
the protector is not w
or
k.
4
.
Set v
oltage of Bias Bo
x to 27V
, and mak
e sure
the protector is w
or
k.
2
O
THER PR
O-
TECT
OR
1.
Once finish rectified Electrolytic Capacitor shor
t
testing in +B line
, chec
k all possib
le damaged
components on +B line
.
(Use r
a
ndom selected set f
or inspection)
3
PR
O
TECT
OR OPERA
TION CHECKING
No.
Adjusting point
Adjusting pr
ocedure/conditions
W
a
vef
orm and other
s
VIDEO AND A
UDIO
OUTPUT CHECK
1.
Receiv
e the "P
AL Color Bar" signal (100%
White
Color Bar
, Sound 400 Hz 100% Mod.)
2
.
T
e
rminate the
Video output with a 75 ohm imped-
ance
. M
a
k
e
sure the output is as specified (1.0
Vp-p
±
3 dB).
3
.
T
e
rm
inate the A
udio output with a 10k ohm im-
pedance
. M
a
k
e
sure the output is as specified
(1.76 Vp-p
±
3 dB).
1
VIDEO AND A
UDIO INPUT
CHECK
1
.
Using the
TV/A
V k
e
y on the remote controller
,
mak
e
sure that the modes change in order of
TV
,
A
V1, A
V2 &
TV again and the video & audio out-
put are according to the input ter
minal f
or each
mode
.
2
A/V INPUT AND OUTPUT CHECKING
SAME LEVEL
W
Y
Cy
G
Mg
R B
FOCUS ADJUSTMENT
No.
Adjusting point
Adjusting pr
ocedure/conditions
W
a
vef
orm and other
s
Focus
1.
Receiv
e the
“Monoscope P
atter
n”
signal.
2.
Press R/C to set Picture NORMAL condition.
3.
Adjust the f
ocus control to get the best f
ocusing.
1
P
AL CHR
OMA ADJUSTMENT
No.
Adjusting point
Adjusting pr
ocedure/conditions
W
a
vef
orm and other
s
SUB COLOUR (I2C B
U
S
CONTR
OL)
1.
Receiv
e the
“P
AL Color Bar”
signal.
2.
Press R/C to set Picture Nor
mal condition.
3.
Connect the oscilloscope to Red cathode
.
Range :
20
V/Div (A
C)
(Using 10:1 Probe)
Sw
eep Time
:
10
µ
sec/Div
4
.
Using the R/C call
“SUB-COL
” in SER
VICE mode
.
Adjust SUB COLOUR b
us data, so that the 75%
White & Red por
tions of P
AL Color Bar be at the
same le
v
el shown as Fig 10.
5.
Add another 6 STEP from the same le
v
e
l in (4).
6.
Clear the ser
vice mode
.
1
Fig. 9
Cy G
B
W
Y
100%
W Mg R
75%