Oki OKIOFFICE84 Maintenance Manual page 317

(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, regist gear, drum gear, hopping roller is shown in the table below and on
the subsequent pages.
Main Motor Electromagnetic Clutch
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 Assy
The heat Assy 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.
Hopping Roller
OFF Non-rotation
ON Rotation
OFF Non-rotation
B - 3
DESCRIPTION OF
PRINT OPERATIONS
Regist Gear Drum Gear
Non-rotation Rotation
Rotation Rotation
Rotation Rotation
40672201TH Rev. 4
Operation
Warm-up
Hopping
Prinitng