HP LaserJet 4200 - Image-formation system

98 Theory of operation Q2431-90912
Duplexer
The duplexer driver controls the operation of the duplexer. An 8-bit microprocessor in the
duplexer driver controls the duplexer sequence and the communication with the DC controller
PCA.
The duplexer driver drives the solenoid, motors, and fan according to commands that the DC
controller PCA sends to the duplexer. The duplexer also communicates its status to the DC
controller PCA.
The printer delivers a charge of +24 vdc to the duplexer, which then generates +5 v for the
integrated circuits.
Figure 29. Duplexer I/O block diagram