Sharp 25WG3, Service Manual

Page: 10 / 44

10
25WG3
HORIZONT
AL,
VER
TICAL,
DEFLECTION LOOP ADJUSTMENT
.
NO
ADJUSTMENT POINT
ADJUSTMENT CONDITION/PROCEDURE
WAVEFORM OR OTHERS
1.
Receiv
e the "CR
OSSHA
TCH P
A
TTERN"
signal.
2.
Call the "S-COR" IN SER
VICE mode
.
3.
Increase or decrease the "S-COR" b
y
using the
V
olume UP/DO
WN k
e
y to get
the best LINEARITY
.
4.
Adjustment with S-COR:
O
VERALL
VER
TICAL LINEARITY
.
5.
Readjust the "V
-AMP" to mak
e the
o
v
erscan 8.5%.
Readjust or align "V
-
SIFT" to match the screen center with the CR
T’
s geometr
ical center
.
5
S-COR (I
2
C B
US CONTR
OL)
V
-LINEARITY
:
±
5% Max
1.
Receiv
e the "P
AL Color Bar" signal.
2.
Using remote controller
, call NORMAL
mode
.
3.
Connect the oscilloscope to
TP852
(Red cathode). Range:
20
V/Div
(Using
10:1
Probe)
Sw
eep:
20
µ
sec/Div
4.
Using the R/C call "SUB COL" adjustment mode
. Adj SUB-COL b
u
s
data, so that the 75%
White & Red
por
tions of P
AL Color Bar be at the
same le
v
el.
5.Clear the adjustment mode
.
P
AL CHR
OMA ADJUSTMENT
NO
ADJUSTMENT POINT
1
SUB COLOUR ADJ
.
(I
2
C BUS CONTR
OL)
ADJUSTMENT CONDITION/PROCEDURE
WAVEFORM OR OTHERS
Cy
G
B
R
Mg
100% W
WY
Same level
Figure 8
1.
Receiv
e the A
V
NTSC 3.58 Colour Bar
signal.
2.
Connect the oscilloscope to
TP853.
Range: 500mV/Div Sw
eep time:
20
µ
sec/Div
3.
Set the "SUB-TIN" mode at ser
vice mode
.
Adjust the "SUB
TIN" b
us data so that
the
FIRST AND SECOND por
tions of
the
colour Bar are SAME le
v
el sho
wn
in Figure 9.
NTSC CHR
OMA ADJUSTMENT
NO
ADJUSTMENT POINT
1
A
V
-TINT
(I
2
C BUS CONTR
OL)
ADJUSTMENT CONDITION/PROCEDURE
WAVEFORM OR OTHERS
Figure 9
Note:
Be sure that A
V
TINT set to 00 at SER
VICE mode
.
(1) Receiv
e the P
AL B/G PHILIPS patter
n
signal.
(2)
Switch on ser
vice mode then press
channel up/do
wn k
e
y to select
Y DELA
Y
mode
.
(3)
Press v
olume up/do
wn k
e
y
to select a
suitab
le number so that luminance dela
y
similar to color dela
y,
sho
wn as fig.
10.
(4)
The
Y DELA
Y data is betw
een 6~8.
(5) Switch off the ser
vice mode
.
NO
ADJUSTMENT POINT
1
Y
DELA
Y
(I
2
C D
A
T
A
)
ADJUSTMENT CONDITION/PROCEDURE
WAVEFORM OR OTHERS
Figure 10
Y DELA
Y ADJUSTMENT
same distance
1.
Call "SECAM" in SER
VICE mode
.
2.
Switch the "SECAM" b
y
using the
V
olume UP/DO
WN k
e
y to "OFF".
OPTION ADJUSTMENT
NO
ADJUSTMENT POINT
1
SECAM SETTING
ADJUSTMENT CONDITION/PROCEDURE
WAVEFORM OR OTHERS
1.
Call "M" in SER
VICE mode
.
2.
Switch the "M" b
y
using the
V
olume
UP/DO
WN k
e
y to "OFF".
2
M
SETTING
1.
Call "S-SYS" in SER
VICE mode
.
2.
Switch the "S-SYS" b
y
using the
V
olume UP/DO
WN k
e
y to "OFF".
3
S-SYS SETTING
1.
Call "C-SYS" in SER
VICE mode
.
2.
Switch the "C-SYS" b
y
using the
V
olume UP/DO
WN k
e
y to "OFF".
4
C-SYS SETTING