Sharp LC-20S4U-S Service Manual And Parts Listparts List page 14

LC-20S4U-S
5. Take the following procedure when IC2009 (EEPROM) has been initialized or
IC2001 (microprocessor) replaced.
5-1. Connect pins (81) and (82) of IC2001 (microprocessor) to GND, and turn on the power.
5-2. Make sure "20" (inches) is selected for the screen size.
5-3. Make sure the model number "A627B" is selected.
(Onscreen display of adjustment process menu page 1)
0 1 2 3
0 1
1
M O
I N
2
3 E R
4
P U
–
5
V
6
E X
6. Adjustments
6-1. Common bias adjustment
1) Select the "COM BIAS" mode on adjustment process menu page 2. Press the CURSOR RIGHT/LEFT keys
to generate the built-in signal.
2) Using the "cursor RIGHT/LEFT" keys, readjust the setting so that flickering gets to minimum.
3) To quit the built-in signal pattern, press the "cursor UP/DOWN" keys. The adjustment process mode screen
reappears.
6-2. TAMP adjustment
1) Feed the 100% white raster signal through the antenna input.
2) See if the "YDATA" reading on adjustment process menu page 2 is within the range in the table below. If not,
select the "NTSC TAMP" item on the same page. Press the "cursor RIGHT/LEFT" keys to scroll down the
item. Using the "cursor RIGHT/LEFT" keys again, readjust the "YDATA" reading to within the range shown
below.
Then reduce 24 from the "NTSC TAMP" setting and enter this value for "PAL-M TAMP" and "PAL-N TAMP".
3) Finally press the "cursor UP/DOWN" keys to return to the adjustment process mode screen.
Model numbe LC-20S4U-S
Setting (NTSC)
Reference
(Onscreen display of adjustment process menu page 1)
0 1 2 3
0 2
1 C O
T A
2
3 Y D
4
T A
5
N T
6
P A
7
P A
8
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
D E L
C H S I Z E
R O R N O
B L I C M O
C H I P
T C O N T R
155-158
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
M B I A S
M P L
A T A
M P H
S C T A M P
–
L M T A M
–
L N T A M
R E S E T
D E
O L
P
P
Y data
(white 100%)
14
A 6 2 7 B
2 0
0
O F F
1
O F F
1 0 0
1 5 5
1 5 8
1 5 8
1 2 0
9 6
6
9