2-34 Phaser 7500 Printer Service Manual
Theory of Operation
MOB ADC Assembly (PL18.1.4)
The MOB ADC Sensor is a Sensor Unit related to the Image Formation Control
(Process Control, Color Registration Control).
The MOB ADC Assembly is made up of the following main components.
• ADC Sensor Assembly - Consists of the ADC Sensor and the Shutter Solenoid.
• ADC Sensor - Detects the toner patch density on the belt before the
secondary transfer.
• Shutter Solenoid - Uncovers the belt detection section of the ADC Sensor
during the detection of toner patch density on the belt and opens/closes
the shutter.
• Environment Sensor - Detects the temperature and humidity in the machine.
• IBT Belt Home Position Sensor - Detects the reference position of the belt.
• MOB Sensor In - Detects the regi shift for each of the colors - Y, M, C, K by the
Chevrons printed at the rear of the belt.
• MOB Sensor Out - Detects the regi shift for each of the colors - Y, M, C, K by
scanning the Chevrons printed at the front of the belt.
IBT Belt Unit (PL6.1.10)
The Primary Transfer Unit transfers the toner image that was formed on the Drum
surface for each color onto the belt.
The IBT Belt Unit is made up of the following main components.
• 1st BTR Roll (Y/M/C/K) - During printing, these apply positive charge to the
bottom side of the belt to transfer the toner image that was created on the
Drum onto the belt.
• Belt - Overlays the toner images that were formed by each color and transfers
it.
• Backup Roll - Contacts the 2nd BTR through the belt during the Secondary
Transfer to transfer the toner image from the belt onto the paper.
IBT Belt Cleaner (PL6.1.7)
The IBT Belt Cleaner cleans any toner remaining on the Transfer Belt after the
transfer of toner image onto the paper.
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