Print Head; Print Cartridge; Logic/Control Board Switches - IBM 4975 02L Maintenance Information

Print Cartridge
The print cartridge contains the logic to generate
proportional spacing between characters and the 10 cpi
format. The print cartridge must be in position during
a print operation.
Logic/ Control Board
The logic/control board receives command information
from the host system. The logic/control board sends
an interrupt request to the host ,system. In addition to
communicating with the host system, the logic/control
board contains all logic for controlling the printer.
Printer
Mode switch (3)
t
Left margin signal (2)
I
Power
~
supply
End-of-forms switch (3)
Print wires (8)
Logic/control
Print emitters (3)
board
Print head motor (4)
Forms feed motor (4)
Signal cable
Forms feed emitter (2)
Head lift solenoid (2)
Note:
The number in parentheses is the number of wires.
Logic/ Control Board Switches
The logic/control board switches are to be used by
Customer Engineers as an aid in servicing the IBM
4975 Printer and to select the data line speed (model
02R only).
The switches have different functions for Model 02L
and for Model 02R.
80 Character width
Theory 4-3