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Duplexing unit (HP Color LaserJet CP4525dn, HP Color LaserJet CP4025dn,
and HP Color LaserJet CP4525xh only)
For supported models, the duplexing unit reverses the paper and feeds it through the paper path to print
the second side.
Figure 1-43 Duplexing unit
Duplex block
Duplex media path
Simplex media path
Duplexing reverse and feed control
The duplex reverse control reverses the paper after the first side is printed and feeds it to the duplex re-
pickup position to print the second side of the page.
1. At a specified time after the first side of a page is printed, the duplex reverse motor rotates, and
the duplex reverse solenoid is turned on.
2. The duplex flapper moves, and the paper is fed to the duplex reverse unit.
3. After a specified period of time, the duplex reverse motor is reversed, and the paper is fed to the
duplex feed unit.
4. The duplex reverse motor and the pickup motor move the paper to the duplex re-pickup position.
52 Chapter 1 Theory of operation ENWW