Oki OKIOFFICE44 Service Manual page 306

(3) Pulse motor (Main)
This pulse motor of 48 steps/rotation is two-phase excited by the signal from the main control board; it
performs feeding control by switching normal rotation to reverse rotation or vice versa and turning on/off
the electromagnetic clutch. The relationship between the main motor, electromagnetic clutch, registration
gear, drum gear, hopping roller is shown in the table below and on the subsequent pages.
Main Motor
Normal rotation
Reverse rotation
(4) LED head
The shift and latch registers receive image data from the main control board for each dot line. 2,560 or
2,496 LEDs are driven to radiate the image drum.
(5) Heat Assembly
The heat assembly consists of a heater, a heat roller, a thermistor, and a thermostat.
The power supply unit supplies AC voltage to the heater according to the HEATON signal from the main
control board to heat the heat roller. The main control board monitors the heat roller temperature via the
thermistor and keeps the temperature constant by turning on/off the heater AC voltage supply.
If the heat roller temperature rises abnormally, the thermostat of the heater voltage supply circuit functions
to forcibly suspend the AC voltage supply.
Print Operation Description
Electromagnetic Clutch Hopping Roller
OFF Non-rotation
ON Rotation
OFF Non-rotation
B - 2
Regist Gear Drum Gear
Non-rotation Rotation
Rotation Rotation
Rotation Rotation
Service Manual, P/N 59276801
Operation
Warm-up
Hopping
Prinitng
OKIOFFICE 44