Oki OKIFAX 5950, Maintenance Manual

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DESCRIPTION OF
PRINT OPERATIONS
OF5750/5950 Series January 2001 B - 1
B.1 Mechanical Components
1) EP drum cartridge
The EP (image) cartridge consists of an EP (image) drum, a charger, and a developer.
The cartridge forms a toner image on the drum, using an electrostatic latent image
formed by the LED print head.
2) Resist motor
This resist motor is a pulse motor of 48 steps/rotation that is two-phase excited by the
signal from the M76 board. It drives the hopping roller and the resist roller via two one-
way clutches according to the direction of rotation.
3) Drum motor
This drum motor is a pulse motor of 48 steps/rotation that is two-phase excited by the
signal from the M76 board and is the main motor of this mechanism.
4) LED head
Image data for each dot on a line from the M76 board is received by the shift registers
and latch registers. The Letter size LED head are driven to radiate the image data on to
the EP (image) drum.
5) Fuser
The fuser consists of a heater, a heat roller, a thermister and a thermostat.
An AC voltage from the power supply board (H10, and Low Power Voltage Unit) is applied
to the heater under the control of the HEAT-N signal from the M76 board. This AC
voltage heats the heater. The M76 board supervises the heat roller temperature via the
thermistor, and regulates the heater roller at a predetermined temperature (about 185 ½C
for OKIFAX 5750/5950) by connecting or disconnecting the AC voltage supply to the
heater.
If the heater roller temperature rises abnormally, the thermostat of the heater voltage
supply circuit is activated to cut off the AC voltage supply forcibly.