Sharp 14EM4RU, Руководство по обслуживанию

Страница: 9 / 50

9
9-1
9-2
14EM4RU
21EM4RU
HORIZONT
AL
AND VERTICAL
DEFLECTION LOOP
ADJUSTMENT
No.
Adjusting point
Adjusting procedure/conditions
W
aveform and others
V
-SLOPE (I
2
C
BUS CON- TROL) V
-SHIFT
-50
(I
2
C BUS
CONTROL) V
-AMP50 (I
2
C
BUS CON- TROL) H-SHIFT (50) (H-CENTER) S-CORREC- TION
(I
2
C BUS
CONTROL) SUB-SHARP- NESS Focus
1.
Receive Monoscope Pattern Signal.
2.
Call the "V
-LIN" mode.
3.
Increase or decrease "V
-LIN" by V
olume key till
the horizontal line in the center of monoscope is just at the position where the blanking starts.
1.
Call the "V
-CENT" mode.
2. Increase or decrease "V
-CENT" by V
olume key
till the picture is centered.
1.
Call the "V
-AMP" mode.
2.
Increase or decrease "V
-AMP" by V
olume key to
set overscan of 9.5% typical. Adjustment Spec 9.5% range +1% -0%.
1.
Call the "H-CENT" mode.
2.
Increase or decrease "H-CENT" by V
olume key
to center the picture horizontal.
1. SET
DA
T
A
T
O
(17 for 14") and (20 for 21").
* Check the E-5 CH Monoscope Pattern then re-
adjust V
-Slope, V
-Shift and V
-Amp to makesure
adjustment is in acceptable Ring-Shaped.
1. SET
DA
T
A
T
O
20.
1 2 3 4 5
1.
Receive the "Monoscope Pattern" signal.
2.
Press R/C to set Picture NORMAL condition.
3.
Adjust the focus control to get the best focusing.
1
P
A
L
CHROMA
ADJUSTMENT
No.
Adjusting point
Adjusting procedure/conditions
W
aveform and others
SUB COLOUR (I
2
C BUS
CONTROL)
1.
Receive the "P
AL
Colour Bar" signal.
2.
Press R/C to set Picture Normal condition.
3.
Connect the oscilloscope to Red cathode (D881 Cathode) for 14". Red cathode (D882 Cathode) for 21".
»
Range
: 20 V/div
. (AC) (Using 10:1 probe)
»
Sweep time
: 10
µ
sec/div
.
4
.
Using the R/C call "SUB COL" in SER
VICE mode.
Adjust SUB COLOUR bus data, so that the 75% White & Red portions of P
A
L
Color Bar be at the
same level shown as
Fig. 1-1
.
5.
Add another 6 step up into the value of SUB-COL
obtained in (4)
6. Clear the SER
VICE mode.
1
Cy
G
B
W
Y
100%W
75%
Mg
R
Fig. 1-1
CRT CUT
-OFF
, BACKGROUND
AND SUB-CONTRAST
ADJUSTMENT
(Continued)
No.
Adjusting point
Adjusting procedure/conditions
W
aveform and others
Max beam check
1.
Receive the "Monoscope Pattern" signal.
2.
Press R/C to set Picture NORMAL condition.
3
.
Connect the DC miliammeter between
TP603 (+)
&
TP602 (–). (Full Scale: 3 mA
Range)
4
.
Beam current must be within 800
±
100
µ
A (14")/
1,100
±
100
µ
A (21").
4 6
No.
Adjusting point
Adjusting procedure/conditions
W
aveform and others
SUB-TINT (I
2
C
BUS CON- TROL)
1.
Receive the "NTSC 3.58 Colour Bar" signal thru A
V
in.
2.
Connect the oscilloscope to
TP47B (P882 pin 5)
BLUE-OUT
.
»
Range
:
100mV/div
. (AC)(Use Probe 10:1)
»
Sweep time
: 10
µ
sec/div
.
3.
Call the "SUB-TINT" mode in service mode.
Ad-
just the "SUB-TINT" bus data to obtain the wave- form shown as Fig. 1-1.
4.
Clear the SER
VICE mode.
1
Fig. 1-1
NTSC CHROMA
ADJUSTMENT
No.
Adjusting point
Adjusting procedure/conditions
W
aveform and others
BEAM PRO- TECT
OR
1.
Receive "Monoscope Pattern" signal.
2.
Set CONTRAST MAX.
3.
Set BRIGHT MAX.
4.
During the Collector & Emitter of Q883/5/7 short, make sure the protector ON and switch to standby mode.
1
* Select one of Q883/5/7 to do
each short test.
H•V PROTEC- TO
R
1.
Receive "Monoscope Pattern" signal.
2
.
Connect output of Bias Box to D603 cathode (R610 side).
3
.
Set voltage of Bias Box to 18V and make sure the protector is not work.
4
.
Set voltage of Bias Box to 27V
, and make sure
the protector is work.
2
Other protectors
1.
Once finish rectified Electrolytic Capacitor short testing in +B line, check all possible damaged components on +B line. (Use random selected set for inspection)
3
PROTECT
OR OPERA
TION CHECKING
No.
Adjusting point
Adjusting procedure/conditions
W
aveform and others
VIDEO AND AUDIO OUTPUT CHECK
1.
Receive the "P
AL
Color Bar" signal (100% White
Color Bar
, Sound 400 Hz 100% Mod).
2
.
T
erminate the V
ideo output with a 75 ohm imped-
ance.
Make sure the output is as specified (1.0
Vp-p
±
3 dB).
3
.
T
erminate the
Audio output with a 10k ohm im-
pedance.
Make sure the O/P is as specified
(1.76 Vp-p
±
3 dB).
1
VIDEO AND AUDIO INPUT CHECK
1
.
Using the
TV/A
V key on the remote controller
,
make sure that the modes change in order of
TV
,
A
V
&
TV again and the video & audio output are
according to the input terminal for each mode.If connect input to Front and Rear
A
V
terminal, in-
put terminal of Front
A
V
will be selected.
2
A/V INPUT
AND OUTPUT CHECKING
W
Y
Cy
G
M
g
R
B
SAME LEVEL