Sharp 20D2-S User Manual

9
9-1
9-2
20D2-S/G
21D1-S/G
21D2-S/G
CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT
(Continued)
HORIZONTAL AND VERTICAL DEFLECTION LOOP ADJUSTMENT
No. Adjusting point Adjusting procedure/conditions Waveform 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 Volume 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 Volume key
till the picture is centered.
1. Call the "V-AMP" mode.
2. Increase or decrease "V-AMP" by Volume 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 Volume key
to center the picture horizontal.
1. SET DATA TO 20(21"), 17(20").
* 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 DATA TO 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
PAL CHROMA ADJUSTMENT
No. Adjusting point Adjusting procedure/conditions Waveform and others
SUB COLOUR
(I
2
C BUS
CONTROL)
1. Receive the "PAL Colour Bar" signal.
2. Press R/C to set Picture Normal condition.
3. Connect the oscilloscope to
Red Cathode(D882 Cathode) for 21" (Normal
Neck).
Red Cathode(D881 Cathode) for 20" (Mini
Neck).
» Range : 20 V/div. (AC) (Using 10:1 probe)
» Sweep time : 10 µsec/div.
1
No. Adjusting point Adjusting procedure/conditions Waveform 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 1100 ± 100 µ
A.
4
6
PAL CHROMA ADJUSTMENT
(Continued)
No. Adjusting point Adjusting procedure/conditions Waveform and others
1
4. Using the R/C call "SUB COL" in SERVICE mode.
Adjust SUB COLOUR bus data, so that the 75%
White & Red portions of PAL Color Bar be at the
same level shown as Fig. 1-1.
5. Clear the SERVICE mode.
Cy
G
B
W
Y 100%W
75%
Mg R
Fig. 1-1
*Before adjust SUB-COL, make sure COL-OP=8,
COL-OS=8, COL-O3=4, COL-O4=4.
After adjust SUB-COL, set COL-OP=14, COL-
OS=14, COL-O3=10, COL-O4=10.
SUB COLOUR
(I
2
C BUS
CONTROL)
No. Adjusting point Adjusting procedure/conditions Waveform and others
SUB-TINT (I
2
C
BUS CON-
TROL)
1. Receive the "NTSC 3.58 Colour Bar" signal thru
AV in.
2. Connect the oscilloscope to TP47B (P882 pin 5)
BLUE-OUT.
» Range : 100mV/div. (AC)(Use Probe 10:1)
» Sweep time : 10 µsec/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 SERVICE mode.
1
Fig. 1-1
NTSC CHROMA ADJUSTMENT
No. Adjusting point Adjusting procedure/conditions Waveform and others
BEAM PRO-
TECTOR
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-
TOR
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
PROTECTOR OPERATION CHECKING
W
Y
Cy G Mg R
B
SAME LEVEL

Sharp 20D2-S Specifications

General

Brand	Sharp
Model	20D2-S
Category	TV
Language	English