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[4] Initialization
4-1. Ground pins (81) and (82) of IC2001 (microprocessor) and turn on the power.
4-2. Make sure the screen size is set at 20 inches.
4-3. Make sure the model number is "A646BH" (LC-20SH3H/SH4H), "A646BM" (LC-20SH3M/X/SH4M/X).
(Adjustment Process Menu Page 1)
0
1
2
3
4
0
1
1
M
O
D
E
I
N
C
H
2
3
E
R
R
O
4
P
U
B
4
E
X
T
6
~:A646BH (LC-20SH3H/SH4H)
:A646BM (LC-20SH3M/X/SH4M/X)
[5]
5-1. Model-by-model sending data
Separately published.
5-2. ROM collection
Separately published.
[6] Adjustment
6-1. Common bias adjustment
1) Feed a built-in signal.
2) Apply the specified instrument at the center of the screen.
3) Observe the instrument output on an oscilloscope.
4) Adjust the "COM BIAS" setting on Adjustment Process Page 2 so that the peak-to-peak of the wave be
minimized.
6-2. TAMP adjustment
1) Receive the standard colour bar signal.
2) See if the "Y" reading (maximum) on Adjustment Process Page 2 is within the range in the following table.
If not, adjust the "NTSC TAMP" setting on the same page to have the "Y" reading (maximum) within this range.
Model
Setting (PAL)
Reference
(Adjustment Process Menu Page 2)
0
1
2
3
4
0
2
1
C
O
M
T
A
M
P
2
3
Y
D
A
4
T
A
M
P
5
N
T
S
C
6
P
A
L
S
E
C
A
7
8
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
L
S
I
Z
E
R
N
O
R
L
I
C
M
O
D
C
O
N
T
R
O
LC-20SH3H/M/X
LC-20SH4H/M/X
155~158
155~158
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
B
I
A
S
L
T
A
H
T
A
M
P
T
A
M
P
M
T
A
M
P
E
S
E
T
E
L
Y Data
(White 75%)
19
LC-20SH3H/M/X
LC-20SH4H/M/X
~
0
2
0
O
F
F
F
O
F
4
5
0
5
1
5
1
5
8
8
1
5
8
4
9
0
9
0
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