ENWW Pickup/feed system 185
Duplexing feed unit (HP 3700 printer only)
The duplexing feed unit reverses the paper after one side is printed and re-feeds it to the pickup/
feed unit for printing the other side.
The following is the sequence of paper feed at the duplexing feed unit.
1 The paper passes through the fuser after the front side is printed.
2 The delivery motor (M2) rotates counterclockwise after a specified period of time from when
the paper has passed the fuser and delivers the paper to the duplexing feed unit. The paper is
reversed here.
3 When the reversed paper sensor (PS9) detects the edge of the reversed paper, the duplexing
feed solenoid (SL5) is turned on to rotate the duplexing feed roller.
4 The paper is fed to the duplexing feed unit by the roller, being positioned in line by the oblique
roller and the delivery guide.
5 The paper stops at the duplex pickup position, as the edge of the paper reaches the PS10,
and the SL5 is turned off.
6 When the duplex pickup is ready, the SL5 is turned on and it feeds the paper into the printer.
7 The paper, after re-correction of skew by the registration roller, is fed to the delivery tray for
printing the other side.
Note Two stationary A4 or letter size papers may be inside the printer during duplex printing; only one
legal size paper may be inside the printer during duplex printing.
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