Roche Diagnostics April 2007
A-62 Service manual · Version 2.0
5 Electronic diagrams 91xx pH/Electrolyte Analyzers
Electronic diagrams
SBC PCB - analog selector and A/D converter - 9180, 9181
Figure A-27 SBC PCB - analog selector and A/D converter - 9180, 9181
ADRUN
-5VA
ADDAT5
R71
200K 1%
12
VCC
ADDAT0
ADHBEN-
U20
ICL7109
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
35
34
33
36
39
37
38
29
30
31
32
17
21
18
19
20
26
27
24
25
22
23 28
1
40
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
OR
POL
STATUS
INHI
INLO
COMMON
REFIN+
REFIN-
REFCAP+
REFCAP-
REFOUT
BUFFER
AZ
INT
TEST
MOD E
LBEN
HBEN
CE/LOAD
RUN/HOLD
SEND
OSCSEL
BUFFOSCOUT
OSCIN
OSCOUT V-
GND
V+
ADSTATUS
C57
1uF
12
R69
1K
1 2
2.05V
R60
100
12
ADDAT1
"2.500V"
R66
1K
12
ADDAT2
R68
1K
1 2
+2.500V
ADSEL2
U21
MC1403
1
3
2
VIN
GND
VOUT
R73
4.53K 1%
12
R61
100K
1 2
A/D CONVERTER
ADDAT4
VCC
+5VA
Cl/Ca/LiOUT
-5VA
ANALOG CHANNEL SELECTOR
ADCE-
ADDAT[0..7]
ADDAT0
U19
4051
13
14
15
12
1
5
2
4
6
11
10
9
3
8
7
16
X0
X1
X2
X3
X4
X5
X6
X7
INH
A
B
C
X
VSS
VEE
VDD
ADSEL0
DGND
TEMPOUT
ADDAT7
R70
1K
12
A
GND
C54
1nF
1 2
ADDAT1
ADDAT3
TP14
TP
1
1 LSB APPROXIMATELY 1mV
NaOUT
+5VA
ADDAT6
ADDAT5
ADDAT2
ADDAT3
NOTE:
R67
1K
1 2
ADLBEN-
KOUT
ZD5015 G
SCHEMATIC, MAIN BOARD 9180 / 9181
911Monday , May 03, 1999
Tit le
Size Document Number Rev
Date: Sheet
of
ADDAT[0..7]
C55
330nF
12
X1
3.58MHz
1 2
ADDAT4
C56
150nF
12
ADSEL1
R72
1K 1%
1 2
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