IBM 5280 Maintenance Information Manual page 19

51TO
II
PTX Connector
1m
Solenoid Connector
AOl diskette 1 col (+5 V)
AOl 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)
m
Head Connector
m
I/O I nterface Connector
A01 not used
AOl -5 V
A02 blank
A02 power supply ground A03
head 0 read/write coil
A03 - A18 ground
A04 head 0 center tap
BOl +5 V 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
Al0
head 1 erase common
B07 +file data
All head 1 erase
B08 +inner tracks
A12 head 1 read/write coil
B09 +erase gate
A13 head 1 center tap
Bl0 +access 0
A14 head 1 read/write coil
B 11 +se lect head 1
if)
B12
not used
Stepper Motor Connector
B13 +access 1
B14 +write gate
AOl +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
D
A06
MC-O
LED Connector
AOl diskette 2, 20 ground
A02 blank
A03 diskette 2, 20 ground
A04 blank
A05 diskette 1 ground
A06 diskette 1 anode
333
Locations 7