Service Manual
Operating Principles
The paper stacked in the paper cassette is pushed by the feed rolls. This causes the top of the paper
stack to contact them. The feed solenoid
or disconnect the main motor drive to the feed
roll assembly. When the feed solenoid is on and the feed rolls rotate, the top sheet of paper is
separated from the others and transported to turn rolls by friction separation.
The turn rolls send the paper supplied at the paper pick-up section (feed rolls) toward the
registration section
roll assembly and
sensor). The turn solenoid connects or
disconnects the main motor drive to the turn roll assembly. While the turn solenoid is on and the
turn rolls stop, paper waits before the registration section. This causes through-put up. This printer
is long between paper pick-up position and registration section. If paper pick-up is started by the
trigger of the START (print start) signal, the video controller waits at paper feeding time. This
timing chart is Figure 2-16.
I
Video l/F Signal
Paper Position
Video Controller Job
Total Job Time
Drum
Feed Rolls
Roll
Image processing
Figure 2-16. Printing Timing Chart (1)
This printer fed paper until before registration section before
the START signal of engine
controller (MC
so that through put up. This printer add
Feed) signal of video
interface.
When the video controller sends
Feed) signal of video interface signals to engine
controller (MC
before START (print start) signal of video interface signals, this printer sends
paper to before
sensor sensed position, and holds the sending paper on this position by turn
solenoid on. Then printer starts sending paper and printing when the engine controller (MC
receives START signal. The video controller process printing image between
signal and
START signal sending. This timing chart is Figure 2-17.
The
signal used sequence is through put better than no used sequence.
Video l/F Signal
●
Wait position
Drum
Exit
Feed
Fuser
●
Video Controller Job
Image processing
Total Job Time
Figure 2-17. Printing Timing Chart (2)
Rev.
2-9
