Ricoh M000, Service Manual

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Engine Hardware Specifications
M000/M009 6-10 SM
6.4 ENGINE HARDWARE SPECIFICATIONS
6.4.1 ENGINE FIRMWARE
Driver
By gearing, the main motor drives the rollers such as the feed roller, developing roller, fuser
roller, and exit roller. The BLDC motor is controlled for such acceleration section and
steady section. The BLDC main motor is operated by the BLDC clock and the enable
signal.
Transfer
The charging voltage, developing voltage and the transfer voltage are controlled by PWM
(Pulse Width Modulation). Each output voltage is changeable due to the PWM duty. The
transfer voltage set when the paper has passed the transfer roller is decided by the
conditions of the environment in which the machine is operating. The resistance value of
the transfer roller changes in accordance with the surrounding environment, and the
voltage value, which changes in accordance with the operating environment, is controlled
with the AD converter. The voltage value for impressing to the transfer roller is decided by
the changed value.
Fusing
The temperature change of the heat roller's surface changes according to the resistance
value through the thermistor. By converting the voltage value, which is impressed to the
resistance, to the digital value through the AD converter, the temperature is decided. The
AC power is controlled by comparing the target temperature to the value from the
thermistor. If the value from the thermistor is out of controlling range while controlling the
fusing, the error stated in the below table occurs.
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA