Oki B4100 - Manual (Page 507)

40055101TH Rev.4 507 /
(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.
(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
OFF
ON
Hopping Roller
Non-rotation
Rotation
Non-rotation
Regist Gear Drum Gear Operation
Warm-up
Hopping
Prinitng
Non-rotation
Rotation
Rotation
Rotation
Rotation
Rotation
Normal rotation
Reverse rotation
OFF