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UP-250
Technical manual
Rs-232 Serial Interface Circuit Board Diagram - Casio UP-250 Technical Manual
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Technical manual
(10 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
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RS-232 Serial Interface Circuit Board Diagram
U1
C2
RD
DSR
SD
DTR
TO HOST
1
FG
2
SD/SD1
3
RD/SD2
4
RS/RD1
5
/RD2
6
DR/INIT1
7
SG
SG
8
/DR1
9
/DR2
10
/CS1
11
RTS
/CS2
12
13
14
15
16
17
18
19
20
ER
21
22
23
24
25
DSR
INIT2
0
SHELL
CN1
#25INIT
+5V
C1
+12V
16
2
VCC
V+
C3
4
1
C2+
C1+
5
3
C2-
C1-
13
12
RD
R1I
R1O
8
9
DSR
R2I
R2O
14
11
SD
T1O
T1I
7
10
DTR
T2O
T2I
15
6
GND
V-
C7
SG
RTS
D1
R2
C6
R20
S
G
D2
-12V
D3
C4
R15
R12
R11
SG
D4
DSR
DTR
+5V
+
+
1
5
2
V
V
SD
RD
#25_RESET
DSR_RESET
SG
SG
RTS
+12V
R16
D
#
R3
S
2
+12V
R
5
|
|
R
R
E
E
RTS
S
S
R4
8
E
E
3
T
T
1
2
R17
U2A
4
+
5
V
R18
-12V
R5
R8
-12V
R13
+12V
R9
R14
5
7
R6
6
U2B
R10
-12V
R19
— 145
—
TP2
RTS
DSR
R21
DTR
+5V
+
5
V
SD
RD
R1
C5
R
Q1
T
10K
S
R7
10K
Q2
10K
10K
TO MAIN BOARD
CN2
1
DK 1
2
DK S
3
PG
4
PG
5
+24V
6
+24V
7
PG
8
HOST RTS
9
CTS
SG
10
I/F DET
11
RTS
12
CLKOUT/DTR
13
CLKREQ
14
SG
15
+5V
16
DK 2
17
DK G
18
DK P
19
PG
20
+24V
21
+24V
22
PG
SG
23
SG
24
SD
25
RD
26
(RES)
27
#25_RESET
28
DSR_RESET
29
#RESET
SG
30
SG
TP1
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Table of Contents
Troubleshooting
Chapter 4 Troubleshooting
77
Troubleshooting Flowchart
78
Troubleshooting Tables
85
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