Cassette Pick-Up - Canon LBP1760P Service Manual

C. Cassette Pick-up
a. Outline
When the video controller inputs the /PRNT signal to the engine controller, the main motor (M1)
starts rotation. When the main motor reaches its prescribed speed, the feed roller clutch
(CL101) and cassette pick-up solenoid (SL101) are turned ON. As a result, the cassette pick-up
roller, cassette feed roller, separation roller and feed rollers are driven by the main motor rota-
tion.
The cassette pick-up roller makes one rotation with the pick-up solenoid ON, and picks up
the paper in the cassette. Then, the unnecessary sheets are removed by the separation roller
and the picked up paper is fed to the pre-feed sensor (PS102).
The CPU detects the condition of the PS102 for a prescribed period of time. If the PS102 does
not detect no paper within a prescribed time, the CPU turns OFF the feed roller clutch (CL101)
and stops feeding the paper in the prescribed period of time after the top of page sensor (PS103)
detects the paper present condition of the preceding paper. When the top of page sensor (PS103)
detects the trailing edge of the preceding paper, the CPU resumes feeding the stopped paper. By
this, the between-page distance appropriate for the continuous printing is achieved.
The paper then reaches the registration arm where its skew is corrected, goes through trans-
fer, separation, fixing and delivery unit and is delivered to the tray.
• Cassette pick-up timing
/PRNT signal
Main motor (M1)
Feed roller clutch (CL101)
Scanner motor
Pick-up solenoid (SL101)
Cassette pick-up roller
Cassette feed roller
Separation roller
Pre-feed sensor (PS102)
STBY INTR
About 0.7
About 0.15
Figure 2-5-2
CHAPTER 2
(Unit : Second)
PRINT
About 0.1
2 - 41