Xerox PHASER 3435, Service Manual

Page: 215 / 247

General Procedures and Information
Phaser 3435 5/08 6-29
Table 4:
• Transfer
The charging voltage, developing voltage and the transfer voltage are controlled by PWM
(Pulse Width Modulation). The each output voltage is changeable due to the PWM duty.
The transfer voltage admitted when the paper passes the transfer roller is decided by
environment recognition. The resistance value of the transfer roller is changed due to the
surrounding environment or the environment of the machine, and the voltage value, which
changes due to the environments, is changed through AD converter. The voltage value for
impressing to the transfer roller is decided by the changed value.
• Fusing
The temperature change of the heat rollers surface is changed to the resistance value
through the thermistor. By converting the voltage value, which impressed to the resis-
tance, to the digital value through the AD converter, the temperature is decided. The AC
power is controller 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.
• Open Heat Error
When the engine operates the warm-up process, if the temperature of the fixing unit is not
higher than a specified temperature, the engine defines Open Heat Error. When this error
is broken out, the engine stops all functions and keeps the error state. Also, the engine
informs the error status of the main system. And then the error message is displayed at
LCD window or LED informing the error status of the user.
• Low Heat Error
When the engine is at stand-by, printing or warm-up mode, if the temperature of the fixing
unit is lower than the specified temperature at each state and the lower temperature state
is maintained during the specified time, the engine defines Low Heat Error. When this
error is broken out, the engine stops all functions and keeps it at the error state. Also the
ITEM Description
JAM 0 - After picking up, paper cannot be entered due to paper is not fed.
- After picking up, paper entered but it cannot reach to the feed sensor in certain time due to slip,
etc.
-After picking up, if the feed sensor is not on, re-pick up. After re-picking up, if the feed sensor is
not on after certain time, it is JAM 0.
*It is a status that the leading edge of the paper doesn’t pass the feed sensor.
-Even though the paper reaches to the feed sensor, the feed sensor doesn’t be ON.
*It is a status that the leading edge of the paper already passes the feed sensor.
JAM 1 -After the leading edge of the paper passes the feed sensor, the trailing edge of the paper can-
not pass the feed sensor after a certain time. (The feed sensor cannot be OFF)
- After the leading edge of the paper passes the feed sensor, the paper cannot reach the exit
sensor after certain time. (The exit sensor cannot be ON)
*The paper exists between the feed sensor and the exit sensor.
JAM 2 -After the trailing edge of the paper passes the feed sensor, the paper cannot pass the exit sen-
sor after certain time.