B Print Operation Description B.1 Mechanical Components - Oki OF5700 Service Manual

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Service Guide OKIFAX 5700/5900
Chapter B Print Operation Description
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
thermister, and regulates the heater roller at a predetermined temperature (about 185 °C for OKIFAX 5700/5900) 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.
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