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4
1
~
PTXCP
BA
00
1
o
00
00
00
00
00
00
00
00
I/O
CP
00
00
00
00
00
/J
+5VDC
D
~
-5VDC
TPAOl
TPBOl
oTPDOl
TPE030
0
0 TPEOl
O
+~:
TPC
TPD
TPE
TPco4
1
0
o TPCOl
TPF02 0
0 TPF01
TPF
TPG02 0
0 TPGOl
TPH05 0
•
Gnd
6
1
10000
01
TH
TPG
TPH
00
00
L+24VDC
0018
TP24V
o TPHLD
o
rolB
~A
2 1
LEDCP
o TPLED
SCP
4
1
100
01
Figure E-19. 31S0 Control Card
Test
Line
Points
Names
TH01
Diff Read B
TH02
No Pin
TH03
Diff Read A
TH04
Not Assigned
TH05
-Disable Stepper Motor
TH06
+18V
Figure E-20. 31 SO Control Card Cable
PTXCP - PTX Connector Pins
t/O CP - I/O Connector Pins
LEDCP - LED Connector Pins
SCP
- Solenoid Connector Pins
HCP
- Head Connector Pins
SMCP - Stepper Motor Connector Pins
Test
Line
Points
Names
TPA01
+5 Vdc
TPBOl
-5 Vdc
TPC01
+Access 1
TPC02
D1 PTX
TPC03
Write Data
TPC04
Ground
TPD01
+Inner Tracks
TPE01
+Access 0
TPE02
+Head Engage
TPE03
+Index
TPF01
Ground
TPF02
+Write/Erase Enabled
TPH040
0
0
oTPHOl
o TPAMP 1
oTPAMP
2
00
7
HCP
1
1 0 0 0
0
0
1
Test
Points
TPG01
TPG02
TPH01
TPH02
TPH03
TPH04
TPH05
TPAMP1
TPAMP2
TPHLD
TP24V
TPLED
6
100 00
0
I
SMCP
Line
Names
+File Data
+Erase Gate
MC-3
MC-2
MC-1
MC·O
+Write Gate
Preamp TP1
Preamp TP2
-Head Load
+24 Vdc
31SD LED Voltage
Appendix E. IBM 31SD Diskette Drive Maintenance
E-21
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