174 Theory of operation ENWW
The DC controller notifies the formatter of each error when the following errors are found during
image density detection. The initial value is reset to the new image density adjustment value when
an error occurs.
● Image density sensor abnormality warning: No light is received at the light receivers.
● Image density out of guaranteed range warning: The measurement is found to be out of
specified range.
Pickup/feed system
The pickup/feed system, being comprised of various feed rollers, picks up and feeds a sheet of
paper.
This printer has two pickup trays (the Tray 2 (cassette) and the Tray 1 (multipurpose), and two
delivery trays (the face-down tray and the face-up tray).
The Tray 1 (multipurpose tray) paper sensor (PS1) detects the presence of paper on the Tray 1
(multipurpose tray) and the Tray 2 (cassette) paper sensor (PS2), and detects the presence of
paper in Tray 2.
The DC controller controls three motors (feed motor: M1, delivery motor: M2, drum motor: M3) and
four solenoids (SL1, SL2, SL4, SL5) to drive each feed motor. (SL5 is only for the 3700 printer.)
There are 6 photo interrupters (PS4, PS6, PS7, PS8, PS9, PS10) along the paper path to monitor
the arrival or passing of papers. (SL9 and PS10 are only for the 3700 printer.)
Duplex printing is available only on the 3700 printer.
Figure 5-56 illustrates the motors, solenoids, switches, and sensors.
Note The terms fixing and fuser refer to the same operation (or assembly) and are be used interchangeably
in this document. Also, ITB unit and transfer unit refer to the same assembly and are used
interchangeably throughout this document.
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