Uniwell LX-5700 Repair Manual page 34

1 2
H
(IC23) (IC20) (IC19) (IC21)
VCC
+
C94 C101 C99 C93 C104
10u/16V
0.1u 0.1u 0.1u 0.1u
GND
G
D[0..7]
D[0..7]
VCC
C95
0.1u IC16
6
G1 Y7
4
CSLCD# G2A Y6
F
5
G2B Y5
Y4
Y3
A0 3
A0 C Y2
2
WR# B Y1
1
RD# A Y0
74HC138
E
D
R110
220
C96 IC21B
4
0.1u
6
5
74HC08 x 3
LCDCNT
C
IC21A
1
RES#
3
2
LCDRES#
74HC08
LCDLIGHT
PGND
B
A
1 2
3 4
IC20
D0 18 2
1Y1 1A1
16 4
D1
1Y2 1A2
D2 14 6
1Y3 1A3
D3 12 8
1Y4 1A4
9 11
D4
2Y1 2A1
D5 7 13
2Y2 2A2
D6 5 15
2Y3 2A3
3 17
D7
2Y4 2A4
1
1G
19
2G
7 74HC244
9
10
11
12
13
14
15
IC23
3 2
D0
D0 Q0
D1 4 5
D1 Q1
7 6
D2
D2 Q2
D3 8 9
D3 Q3
D4 13 12
D4 Q4
14 15
D5
D5 Q5
17 16
D6
D6 Q6
D7 18 19
D7 Q7
1
OC
11
CLK
74HC374
IC19
D0 3 2 RS
D1 Q1
4 5
D1 W/R
D2 Q2
7 6
D2 E
D3 Q3
D3 8 9 CS1
D4 Q4
13 12
D4 CS2
D5 Q5
14 15
D5
D6 Q6
D6 17 16
D7 Q7
18 19
D7
D8 Q8
11
CLK
1
CLR
74HC273 VCC
IC21C IC21D
9 12
R80
8 11
10 13
33K
THE MARK "-","NU-" SHOWS THE PART WHICH ISN'T MOUNTED.
3 4
5
IC24A
1 2
74HC04
IC9B
LM358
6
7
5
R79
100K
IC9A
LM358 R104
3 2
+
1
VO
3.3K
2
R103
-
C70
4.7K
0.1u
5
6 7
+
C89
C91
100u/10V
0.1u
CN20
GND
1
VCC
2
VO
3
RS
4
R/W
5
E
6
DB0
7
DB1
8
DB2
9
DB3
10
DB4
11
DB5
12
DB6
13
DB7
14
CS1
15
CS2
16
RSTB
17
VOUT
18
19
SLK
20
JS-1200-20
(LCD)
R105
4.7 1W
Q9
2SD1817
Uniwell Corporation
MPU131-C LCD CONTROL CIRCUIT
Title
GW.Lai
Drawened By: Date:
Page
Anthony Liu
Approves By:
Revision:
6 7
PRINT INDEX
8
LX57XX
H
G
F
E
D
C
B
20-JULY-2004
A
of
5 10
1.07
8