Machine Control System - HP LaserJet II Serie Manual De Instrucciones

HP 33440/HP 33449 COMBINED SERVICE MANUAL
5H4. MACHINE CONTROL SYSTEM
The DC Contro~er PCA-the machine control system-is responsible for coordinating dl activities
involved in the printing process. It drives the laser beam, coordinating dot patiern (video)
data from the Interface/Formatier PCA tith paper size, drum sensitivity, and laser beam
motion information. The machine control system dso controls and monitors paper motion, the
high-voltage system, fuser temperature, erase lamps, and W motors. It dso shares machine status
information tith the Interface/Formatter PCA so that proper diagnostic messages are displayed
on the Control Panel (see Figure 5-16). A fist of the signals monitored or contro~ed by the DC
Controller PCA is in Chap&r 7, Section 7-7.
In summary, the folloting items are controlled by the machine control system:
Paper motion.
Paper size and availabilim.
Laser dfive.
High-voltage system.
Erase Lamps.
Fuser temperature.
Timing.
Smnner and M~n Motor drive.
Machine s~tus.
+24 V operation.
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Dc
controller
PCA
Fomatterl
Interface
PCA
External
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Figure 5-%6. DC controller Block Diagram
5-16