Stacker mode
In stacker mode, the paper is stacked in the paper delivery tray without being stapled. The feed
operation in the stacker mode is explained in the following procedure.
1. The printer engine sends a paper-delivery signal to the formatter after the leading edge of the
paper reaches the fixing-delivery sensor.
2. The formatter sends a paper-delivery notifying command to the stapler/stacker driver.
3. The stapler/stacker driver causes the feed motor (M1303) to drive at the same feed speed as
the printer engine on order to feed the paper to the stapler/stacker.
4. After a prescribed period of time upon receiving the signal, the stacker driver drives the feed
motor (M1303) at the same feed speed as the printer engine to rotate the inlet roller, the upper
delivery roller, and the lower delivery roller. Through this process, the paper is fed into the
stapler/stacker.
5. After the leading edge of the paper passes the inlet sensor (PS1301) (when the leading edge
passes the upper and the lower disengagement rollers), the stapler/stacker driver rotates
M1303 at the feed speed of the stapler/stacker.
6. The stapler/stacker driver changes the feed-motor drive depending on whether the paper that
was fed is the last sheet of the job or not.
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If it is not the last sheet of paper, the driver changes the feed-motor speed to the printer
speed and returns to step 2.
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If it is the last sheet of paper, the driver does not change the feed-motor speed.
When the delivery tray is full of paper for a specified period of time, the delivery paper-full sensor
(PS1306) detects this status and notifies the formatter.
Jam detection
The stapler/stacker has sensors that detect whether the print paper is fed correctly.
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Paper-inlet sensor (PS1301)
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Paper-delivery sensor (PS1302)
A jam is detected when paper is present at the sensor unit during check timings conducted by the
CPU.
If the CPU determines that a jam has occurred, it stops the print operation and notifies the formatter.
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Feed-delay jam
If the paper-inlet sensor (PS1301) does not detect the leading edge of the paper within a
prescribed period of time after it has received a paper-delivery notification command, the CPU
detects a feed-delay jam.
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Feed stationary jam
If PS1301 does not detect the trailing edge of the paper within a prescribed period of time after
the paper inlet sensor (PS1301) detects the leading edge of the paper, the CPU detects a feed
stationary jam.
184 Chapter 4 Theory of operation ENWW
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