Phaser 7500 Printer Service Manual 2-35
Theory of Operation
1st BTR Contact/ Retract
Depending on the mode, there are 3 positions for the 1st BTR as shown in the
illustration.
1. In Full Color Mode, all four 1st BTRs will contact the Drum through the belt.
2. In Black & White Mode, only the 1st BTR (K) will contact the belt (Drum). The
other three 1st BTRs (Y/M/C) will not contact the belt (Drum). The 1st BTR
Contact Retract Clutch operation controls whether the 1st BTR (Y/M/C) is in
Contact/Retract state with the belt (Drum).
3. When in the replacement position, all four 1st BTRs will not contact the belt
(Drum). This position is attained by releasing the lever at the front of the IBT
Belt Unit.
1. Full Color Mode
1st BTR (K)
1st BTR (C)
1st BTR (M)
1st BTR (Y)
Belt
Drum (Y)
Drum (M)
Drum (C)
Drum (K)
2. B&W Mode
3. Replacement Position
s7500-370
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