Xerox Phaser 6115 MFP, Руководство по обслуживанию

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2-12 Phaser 6115MFP Multifunction Product Service Manual
Theory of Operation
* The temperature is controlled at 159 ×C if the system’s interior temperature is 20 ×C or
more and relative humidity is 40% or higher.
Note
Fuser thermal regulation stops and the Fuser heat lamp turned Off when
the system enters Energy Saver mode, a door is opened, or an error
occurs.
Fuser Overheat Protection
The machine provides protection at three different stages to prevent
abnormally high temperature of the Fusing Unit.
■
Soft Protection. If the Thermistor detects a temperature exceeding a
predetermined value, the error code representing abnormally high
temperature is displayed. At this time, the heater lamp is turned Off, and
new print cycles are prohibited.
■
Hard Protection. If the CPU overruns and the output level of the CPU of
the Mechanical Control Board becomes a HIGH or LOW level, and not a
pulse output, and a predetermined temperature or higher is detected, a
circuit within the Mechanical Control Board turns OFF the relay to shut
down the power supply to the Heater Lamp.
■
Thermostat Protection. If neither the soft protection nor hard protection
detect an abnormally high temperature due to a defective Thermistor or
other reason, the Thermostat operates at the specified temperature. This
shuts down the power supply to the Heater Lamp, thus forcibly turning it
OFF.
T r iac Ci r c u it
Powe r S witch
Watchdog
Ci r c u it
A/D
F us e r Wdt
Re s et
Heate r
Remote
ON/OFF
Heati n g Rolle r
F us i n g P r e ssur e Rolle r
The r mo s tat
La s e r S afety S witch
Heate r Lamp
The r mi s to r
GND
5V
E n gi n e Co n t r ol Boa r d
CPU
Ha r d
P r otectio n
Ci r c u it
s 6115-101