Detection And Clearing Of Paper Jams - Toshiba 1550 Service Manual

When the PRINT key is pressed, sheets of paper start being fed from the paper feeding unit (PFU) in
the sequence described below:
(1) About 0.1 sec. later, the drive motor M10 !º is energized, causing the pick-up roller 1 and paper
feed roller 2 to rotate. The pick-up roller is rotated through the pick-up roller clutch CLT6 !¡.
The paper feed roller is rotated through the feed roller clutch CLT5 !™ and the transport rollers are
rotated through the transport roller clutch CLT4 !£.
(The transport rollers are driven by copier's main motor).
(2) The top sheet of paper in the cassette is fed out by the pick-up roller to the paper feed roller which
separates the top sheet from other sheets if more than one sheet has been fed out and sends only
the top sheet to the transport roller. When this sheet turns on the paper stop switch 6 located under
the transport roller, the feed roller clutch !™, pick-up roller clutch !¡ and drive motor are deenergized,
causing the pick-up and paper feed rollers to stop.
(3) At this time, if the copier's aligning switch 7 is off, the transport roller clutch maintains an on-status
until this switch is turned on. But if the copier's aligning switch is on, the transport roller clutch is
deenergized, csusing the rollers to stop.
(4) When the copier's aligning roller is turned off, transport roller clutch is turned on, the rollers start
rotating again. At this time, since the feed roller clutch !™ is off, only the transport roller is rotated,
sending the sheet fed from the cassette into the copier.
(5) After the sheet turns on the copier's aligning switch and is aligned by the copier's aligning rollers 8
and 9, the transport roller clutch is deenergized, causing the rollers to stop.
(6) After the first sheet's trailing edge has passed the paper stop switch 6 to turn it off, when the paper
feeding unit (PFU) receives the next paper feed signal from the copier, the above sequence of opera-
tion will be repeated.
13.3.2

Detection and clearing of paper jams

(1) Within 1.238 sec. after a sheet of paper is fed, if its leading edge does not arrive at the paper stop
switch 6, the jam detection device of the paper feeding unit (PFU) activates to turn off the drive
motor !º, pick-up roller clutch !¡ and feed roller clutch !™.
Mar. 1998 © TOSHIBA 13 - 5 1550/1560 OPTIONAL