LC-20SH3H/M/X
LC-20SH4H/M/X
19
[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)
[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.
Reference
(Adjustment Process Menu Page 2)
0
1
2
3
4
5
6
7
8
9
10
11 12 13
14 15 16
17 18 19
20 21 22
23 24 25 26
1
M
O
D
E
L
~
~
:A646BH (LC-20SH3H/SH4H)
:A646BM (LC-20SH3M/X/SH4M/X)
2
O
F
0
0
F
I
N
C
H
S
I
Z
E
E
R
R
O
R
N
O
R
E
S
E
T
P
U
B
L
I
C
M
O
D
E
0
1
2
3
4
O
F
F
E
X
T
C
O
N
T
R
O
L
4
6
Model
LC-20SH3H/M/X
LC-20SH4H/M/X
Setting (PAL)
155~158
155~158
0
1
2
3
4
5
6
7
8
9
10
11 12 13
14 15 16
17 18 19
20 21 22
23 24 25 26
2
C
O
M
B
I
A
S
4
5
5
1
0
5
5
1
8
5
1
8
8
4
9
0
9
0
T
A
M
P
L
Y
D
A
T
A
S
E
C
A
M
T
A
M
P
H
0
1
2
3
4
N
T
S
P
A
L
C
T
A
M
P
T
A
M
P
T
A
M
P
5
6
7
8
Y Data
(White 75%)
Summary of Contents for LC-20SH3H
Page 31: ...33 6 5 4 3 2 1 A B C D E F G H LC 20SH3H M X LC 20SH4H M X SCHEMATIC DIAGRAM ËINVERTER Unit ...
Page 32: ...35 34 LC 20SH3H M X LC 20SH4H M X 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 1 5 ...
Page 33: ...37 36 LC 20SH3H M X LC 20SH4H M X 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 2 5 ...
Page 34: ...39 38 LC 20SH3H M X LC 20SH4H M X 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 3 5 ...
Page 35: ...41 40 LC 20SH3H M X LC 20SH4H M X 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 4 5 ...
Page 36: ...43 42 LC 20SH3H M X LC 20SH4H M X 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËMAIN Unit 5 5 ...
Page 37: ...45 44 LC 20SH3H M X LC 20SH4H M X 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËSUB Unit 1 3 ...
Page 38: ...47 46 LC 20SH3H M X LC 20SH4H M X 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËSUB Unit 2 3 ...
Page 39: ...49 48 LC 20SH3H M X LC 20SH4H M X 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H ËSUB Unit 3 3 ...
Page 40: ...50 6 5 4 3 2 1 A B C D E F G H LC 20SH3H M X LC 20SH4H M X ËOPERATION Unit ...
Page 41: ...51 6 5 4 3 2 1 A B C D E F G H LC 20SH3H M X LC 20SH4H M X ËR C LED Unit LC 20SH3H M X ...
Page 42: ...52 6 5 4 3 2 1 A B C D E F G H LC 20SH3H M X LC 20SH4H M X ËR C LED Unit LC 20SH4H M X ...
