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ENWW Tray 2/3 paper feed unit 79
MFP unit explanation
Paper up drive control
Paper stacked in the tray is pushed up by
transmitting the drive force of M16/17 (tray
up drive/1/2) to the up/down plate in the tray
via drive wires. M16/17 are controlled by the
PRCB (printer control board). Related
signals are PS2/8 (tray upper limit/1/2) and
PS4/10 (remaining paper/1/2).
1 Operation
a Paper up drive control
When Tray 2/3 is loaded, M16/17 (tray
up drive/1/2) turns on to lift the up/down
plate in the tray. When PS2/8 (tray
upper limit/1/2) detects the upper limit of
paper as the paper up/down plate in the
tray goes up, it turns on and
consequently M16/17 goes off, causing
the tray to stop going up. When PS2/8
turns off after paper is fed, M16/17 goes
on again to move the paper up/down
plate upward. The up/down plate in the
tray is lowered mechanically by its own
weight.
b Paper up drive timing
1 ON timing
M16/17 (tray up drive/1/2) is turned
on when loading of a tray is detected
(by shorting wires at both ends of the
drawer connector).
2 OFF timing
One of M16/17 (tray up drive/1/2) is
turned off when PS2/8 (tray upper
limit/1/2) is turned on.
c Remaining paper detection control
The level of paper remaining in each
tray is detected according to the time
that M16/17 (tray up drive/1/2) requires
to lift up the up/down plate when the
tray is set. This lift-up time (operation
time of M16/17) is saved in the PRCB
(printer control board). After this, the
remaining paper is detected using the
paper feed counter. The detected
remaining paper level is displayed on
the control panel in five steps. PS4/10