Ricoh Aficio SP 5100N, Service Manual

Page: 154 / 175

Engine Hardware Specifications
G186 6-16 SM
ITEM Description
JAM 2
ƒ After the trailing edge of the paper has passed the feed sensor, the paper
does not pass the exit sensor for a certain time.
DUPLEX
JAM 1
ƒ After the trailing edge of the paper has passed the exit sensor, the
leading edge of the paper does not reach the duplex sensor for a certain
time.
DUPLEX
JAM 0
ƒ After the leading edge of the paper has passed the duplex sensor, the
leading edge of the paper does not reach the feed sensor for a certain
time.
Driver
By gearing, the main motor drives the rollers such as the feed roller, developing roller, fuser
roller, and exit roller.
The step motor is controlled for such acceleration section and steady section. In the initial
stage of the motor run, appoint the acceleration section to prevent the step-out of the motor.
It is controlled by the A 3977 motor driver IC. The step signal and the enable signal are sent
to make the phase for driving the motor in CPU.
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.