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Alstom SHPM 101
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SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Appendix A
Page 20 of 71
Figure 20: Zone 3 comparators (QUAD version)
+5V
0V
Shift
register
(V+IZ)ABZ3
Comparator
AZ3
Comparator
ABZ3
Q1NHZ3A
(V–IZ)ABZ3
IRA
PdA
PdB
PdC
DIC0
PSBZ3
MCK
MCK/5
SC
MRI
Inhibits and
control
A1
B1
INH1
OUT1
OUT2
A2
B2
MCK/8
(V–IZ)AZ3
&
(V+IZ)/–90
Shift
register
(V+IZ)BCZ3
Comparator
BZ3
Comparator
BCZ3
Q1NHZ3B
(V–IZ)BCZ3
IRB
A1
B1
INH1
OUT1
OUT2
A2
B2
(V–IZ)BZ3
&
(V–IZ)/–90
Shift
register
(V+IZ)CAZ3
Comparator
CZ3
Comparator
CAZ3
Q1NHZ3C
(V–IZ)CAZ3
IRC
A1
B1
INH1
OUT1
OUT2
A2
B2
(V–IZ)CZ3
&
(V+IZ)/–90
Shift
register
(V+IZ)ABZ3
G
A
Comparator
ABZ3
(V–IZ)ABZ3
A1
B1
INH1
OUT1
OUT2
A2
B2
(V–IZ)A
(V+IZ)/–90
DA1
DB1
DOUT1
(V–IZ)AG
(V–IZ)C
A1
B1
INH1
OUT1
OUT2
A2
B2
(V–IZ)B
DA1
DB1
DOUT1
(V–IZ)BG
DA2
DB2
DOUT2
G
B
G
C
(V–IZ)CG
INH9

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