IBM 5280 Maintenance Information Manual page 100

51TD
II
PTX Connector
1m
Solenoid Connector
A01
diskette 1 col (+5 V) A01 not used
A02
blank
A02 blank
A03 diskette 1 PTX emitter
A03 +head load
A04 diskette 2, 20 PTX emitter
A04 -head load
A05
diskette 2, 20 col (+5 V)
II
m
Head Connector
I/O
Interface Connector
A01 not used
A01 -5 V A02 blank
A02 power supply ground
A03 head 0 read/write coi I
A03 - A18 ground
A04 head 0 center tap
B01 +5V
A05 head 0 read/write coil
B02 blank
A06 head 0 erase
B03
+24 V
A07 head 0 erase common
B04 +index
A08 .ground
B05 +diskette 2 sense
A09 ground
B06
+write/erase sense
A10 head 1 erase common
B07 +file data
A11 head 1 erase
B08
+inner tracks
A12 head 1 read/write coil
B09 +erase gate
A13 head 1 center tap
B10 +access 0
A14 head 1 read/write coil
B11 +select head 1
1m
B12 not used
Stepper Motor Connector
B13 +access 1
B14 +write gate
A01 +24 V
B15 +head engage
A02 blank
B16 +switch filter
A03 MC-3
B17 write data
A04 MC-2
B18 not used A05 MC-1
II
A06 MC-O
LED Connector
A01 diskette 2, 20 ground
A02 blank
A03
diskette 2, 20 ground
A04 blank
A05 diskette 1 ground
A06 diskette 1 anode
333
Locations 7