MX-C250 OPERATIONAL DESCRIPTIONS 11 – 22
14. Fusing section
A. Electrical and mechanism relation diagram
B. Fusing unit drive
The driving of fuser unit is; the driving force is transported to fuser
roller, thru the fuser motor (FUM) and connection gears, based on
the controlling signal from PCU.
C. Heater lamp drive
The temperature on the fuser roller which detected by fuser therm-
istor is transferred to PCU.
If above temperature is low than predetermined one, PCU sends
the heater lamp signal to the heater lamp drive circuit in HL-PWB.
The power triac in heater lamp drive circuit is turned ON, then AC-
power is supplied to heater lamp. Finally the heater lamp is turned
ON and fuser roller (heat roller) is heated up. If above temperature
is higher than predetermined one, PCU stops send the heater lamp
signal to the heater lamp drive circuit in HL-PWB.
In case of abnormal high temperature of fuser roller (heat roller) is
occurred, the thermostat becomes OFF condition, physically cuts
off the power line of heater lamp.
Signal name Name Function and operation
FUFM Fusing cooling fan motor Cools the fusing unit.
FUM Fusing drive motor Drives the fusing unit.
HL_LM Heater lamp (HL\LM) Heats the fuser heat roller.
TH_UM Thermistor UM Regulates Heat Roller Temperature at center of the Heat Roller.
TH_US Thermistor US Regulates Heat Roller Temperature at the end of the Heat Roller.
TS_UM Thermostat UM
Fusing roller overheat protection. Cuts off power supply to heat lamp when over heat condition
is determined.
To Next Page
Loading...
Need help?
General
