2-40
Phaser 7500 Printer Service Manual
Theory of Operation
•
Center Temperature Sensor (non-contact type)
- The Thermistors are electric
resistors that react to temperature changes; they are placed close to, but not
in contact with the Heat Roll to detect the surface temperature of the Heat
Roll. This controls the ON (conducting: light on)/OFF (light off) status of the
Heater Lamp based on the detected temperature.
•
Rear Temp. Sensor (contact type)
- The Thermistors are electric resistors that
react to temperature changes; they are placed in contact with the Heat Roll to
detect the surface temperature of the Heat Roll. This is used to prevent the
Heat Roll from reaching abnormally high temperature.
•
Thermostats (x2)
- The Thermostats are placed in series with the Heater
Lamp power supply. If the Temperature Sensors (Thermistors) have failed to
prevent overheating (primary), and the contact point has reached the
specified temperature, the contact will open to prevent secondary
overheating.
•
Fuser Exit Sensor
- Detects that paper has passed through the Fuser section.
Note
No paper: Sensor blocked
Summary of Contents for PHASER 7500
Page 1: ...Phaser 7500 Color Printer Phaser 7500 Service Manual Xerox Internal Use Only ...
Page 2: ......
Page 60: ...1 30 Phaser 7500 Printer Service Manual General Information ...
Page 448: ...3 310 Phaser 7500 Printer Service Manual Error Messages and Codes ...
Page 484: ...4 36 Phaser 7500 Printer Service Manual General Troubleshooting ...
Page 544: ...5 60 Phaser 7500 Printer Service Manual Print Quality Troubleshooting ...
Page 545: ...6 Chapter Adjustments and Calibrations In this chapter Adjustments Calibrations ...
Page 554: ...6 10 Phaser 7500 Printer Service Manual Adjustments and Calibrations ...
Page 562: ...7 8 Phaser 7500 Printer Service Manual Cleaning and Maintenance ...
Page 900: ...9 118 Phaser 7500 Printer Service Manual Parts List ...
Page 958: ...10 58 Phaser 7500 Printer Service Manual Plug Jack and Wiring Diagrams ...
Page 980: ...11 22 Phaser 7500 Printer Service Manual Reference ...
Page 990: ...I 10 Phaser 7500 Printer Service Manual Index ...
Page 991: ......