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2-6
Phaser 6121MFP Service Manual
Theory of Operation
Automatic Document Feeder (ADF) Print Path
Sensors
The printer contains sensors of various types that perform a variety of functions.
One group of sensors track the progress of the paper along the paper path, and
detects if a jam occurs. Other sensors detect the presence of the Toner Cartridges,
stop printer activity if a door is open (interlock), detect the presence of media in
the trays, and monitor the fusing temperature.
For an overview of sensors in the printer, see “Sensors and Switches” on page 2-11.
Sensor Types
The types of sensors used vary with function. In general, there are three types in
use: photo sensors, microswitches, and thermistors.
Photo Sensors
Two types of photo sensors are used, photo-reflective and photo-receptive. Photo-
reflective sensors use light reflected back from an object to detect its presence.
Photo-receptive sensors use an actuator or the object itself to block the light path
to detect an object or condition.
Photo-reflective sensors have the light emitter and light receiver aligned on a
single surface. Output of the photo-receptor is High (> +4.5 V) when light is being
reflected back and Low (< +.3 V) when it isn’t. Photo-receptive sensors consist of a
LED in one arm of a U-shaped holder, and a photo-transistor in the other arm.
When the sensing area is vacant, nothing is between the arms of the sensor, light
falls on the photo-receptor sending the signal High. If the light is interrupted, the
photo-transistor goes Low.
Microswitches
Microswitches are used primarily as cover interlocks. They are in a normally open
state, and close when actuated. Microswitches employ hooks or catches for
retention in the bracket or frame.
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Содержание PHASER 6121MFP
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Страница 42: ...1 20 Phaser 6121MFP Service Manual General Information...
Страница 92: ...2 50 Phaser 6121MFP Service Manual Theory of Operation Media Handling Tray 1 Feeder s6121mfp 153...
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Страница 109: ...Phaser 6121MFP Service Manual 3 3 Error Messages and Codes s6121mfp 372...
Страница 194: ...3 88 Phaser 6121MFP Service Manual Error Messages and Codes...
Страница 263: ...6 Chapter Adjustments and Calibrations In this chapter Adjust Function Procedures Service Mode Maintenance Mode...
Страница 306: ...6 44 Phaser 6121MFP Service Manual Adjustments and Calibrations...
Страница 307: ...7 Chapter Cleaning and Maintenance In this chapter Maintenance Summary Cleaning Maintenance Procedures...
Страница 327: ...Phaser 6121MFP Service Manual 8 7 Service Parts Disassembly 2 Remove the Imaging Unit s6121mfp 197...
Страница 355: ...Phaser 6121MFP Service Manual 8 35 Service Parts Disassembly 11 Remove the screw metal 6mm and the stopper s6121mfp 212...
Страница 383: ...Phaser 6121MFP Service Manual 8 63 Service Parts Disassembly 4 Unhook the tab and remove the harness guide s6121mfp 242...
Страница 395: ...Phaser 6121MFP Service Manual 8 75 Service Parts Disassembly 10 Disconnect connector CN13 s6121mfp 350 CN3...
Страница 402: ...8 82 Phaser 6121MFP Service Manual Service Parts Disassembly 7 Remove the motor cover s6121mfp 359...
Страница 405: ...Phaser 6121MFP Service Manual 8 85 Service Parts Disassembly 3 Remove the spring s6121mfp 255...
Страница 406: ...8 86 Phaser 6121MFP Service Manual Service Parts Disassembly 4 Remove 2 E rings belt 2 gears and bearing s6121mfp 256...
Страница 411: ...Phaser 6121MFP Service Manual 8 91 Service Parts Disassembly 6 Disconnect connector CN13 s6121mfp 350 CN3...
Страница 412: ...8 92 Phaser 6121MFP Service Manual Service Parts Disassembly 7 Remove the harness from the wire saddle s6121mfp 262...
Страница 414: ...8 94 Phaser 6121MFP Service Manual Service Parts Disassembly 9 Unhook the 2 tabs and remove the fan motor s6121mfp 363...
Страница 431: ...Phaser 6121MFP Service Manual 8 111 Service Parts Disassembly 3 Push the lever and remove the Duplex Unit s6121mfp 302...
Страница 432: ...8 112 Phaser 6121MFP Service Manual Service Parts Disassembly...
Страница 437: ...Phaser 6121MFP Service Manual 9 5 Parts List...
Страница 477: ...Phaser 6121MFP Service Manual 9 45 Parts List...
Страница 488: ...9 56 Phaser 6121MFP Service Manual Parts List...
Страница 489: ...10 Chapter Wiring In this chapter Plug Jack Designations and Locator Diagrams Wiring Diagrams...
Страница 507: ...A Appendix Reference In this chapter Phaser 6121MFP Menu Map Firmware Update Acronyms and Abbreviations...
Страница 530: ...1 6 Phaser 6121MFP Service Manual Index...
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