HP Color 9850mfp Service Manual - Page 141
Fixing motor M29, Pressure/release control
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hp Color 9850mfp 12.2.2 Pressure/release control FIXING UNIT The pressure of the fixing roller L onto the fixing roller U is made by the reverse rotation of the fixing motor (M29) and the cam mechanism. A. Pressure/release operation When the fixing motor (M29) [1] rotates in the reverse direction, the cam mechanism applies pressure (a broken line in the drawing) onto the fixing roller L [3]. There is a one-way clutch [4] provided between M29 and the cam mechanism to provide the transmission of driving force when M29 is rotating reversely, this force is limited only to the cam. The detection of pressure/release is made by the fixing pressure release sensor (PS16) provided on the same shaft as the cam. II UNIT EXPLANATION [1] [4] [3] [2] B. Pressure/release control Pressure on the fixing roller L is released while in warm-up. When copy starts, the fixing motor (M29) rotates reversely to apply pressure, and it stops when the fixing pressure release sensor (PS16) turns off. The unit is now in the pressured state. M29 returns to the forward rotation to convey paper. [2] Fixing motor (M29) Forward Backward Fixing pressure release sensor (PS16) [1] [1] START button (ON) [2] Pressure operation [3] [3] Fixing paper in conveyance 2-67
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