General and Operation Overview
Xerox Internal Use Only Phaser 7100 Service Manual 1-59
• IBT Belt Assembly - Transferred the toner image that was formed on the Drum to the media. The
IBT Belt Assembly is made up of the following main components:
– 1st BTR Roller (Y/ M/ C/ K) - During printing, these Rollers apply positive charge to the
underside of the Intermediate Transfer Belt to transfer the toner image that was created on
the Drum onto the Intermediate Transfer Belt.
– Intermediate Transfer Belt - Forms the complete toner image (CMYK) on the belt surface
and transfers it onto the paper.
– Backup Roller - Contacts the 2nd BTR through the Intermediate Transfer Belt during the
secondary transfer to transfer the toner image on the Intermediate Transfer Belt onto the
paper.
– Belt Cleaner - Cleans any toner remaining on the Intermediate Transfer Belt after the toner
image has been transferred onto the paper.
• Belt Retract Motor (IBT Retract Cam Assembly) - Drives the Cam that moves the position of the
IBT Belt Assembly.
• Belt Retract Sensor (IBT Retract Cam Assembly) - Detects the position (Color Mode/ BW Mode)
of the IBT Belt Assembly.
• Color Toner Density (CTD) Sensor Assembly - The CTD Sensor Assembly is related to the Image
Formation Control (Process Control, Color Registration Control). The CTD Sensor Assembly is made
up of the following main components:
– CTD Sensor (Left) - The Left CTD Sensor is a reflective Color Toner Density Sensor. This
Sensor contains a LED that emits light to shine on the Intermediate Transfer Belt, a photo
detector that detects the light that is reflected by the Intermediate Transfer Belt, and outputs
an electric signal according to that brightness. The Left CTD Sensor detects the toner patch
density on the Intermediate Transfer Belt before the secondary transfer. It is installed on the
left side of the Intermediate Transfer Belt.
– CTD Sensor (Right) - The Right CTD Sensor is the same type as the Left CTD Sensor. It is
installed on the right side of the Intermediate Transfer Belt.
– Temperature Sensor - Monitors the temperature inside the printer (in the vicinity of the
Intermediate Transfer Belt). The detected temperature is used to manage the timing to
perform the Color Density Control.
• 2nd BTR (Transfer Roller) - Contacts the paper at the opposite side of the toner transfer surface
and transfers the toner image that was formed on the Intermediate Transfer Belt surface onto the
paper.
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