Oki OKIOFFICE 84 Service Manual page 432

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 sections of this chapter.
Main Motor Electromagnetic
Clutch
Normal rotation OFF
Reverse rotation ON
OFF
(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.
Copyright 1998, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner
Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Hopping Roller Regist Gear
Non-rotation Non-rotation
Rotation Rotation
Non-rotation Rotation
Drum Gear Operation
Rotation Warm-up
Rotation Hopping
Rotation Printing