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3. AUTOMATIC DUPLEXING UNIT – ADU
This is a very useful option for operators. I've maintained such units for years without even
replacing the rubber feed rollers. All they needed was a periodical cleaning with rubber restoring
fluid.
How ever there are some underwater stones with these modules. First of all sometimes
operators open too rough the two metal sheet transport plates and bend them. As a result the gap
between them becomes too narrow or even disappears, causing paper jams. The other effect if that
the sheet would stop in the middle of its path to the stack tray at the bottom of the module. This is
caused again by the bent plates. They have two paper actuated transport sensors, which position has
become too high and they cannot contact with the receiving led parts. The solution to these
problems is to gently bend the plates to their original position.
Another problem is paper jams, when the sheets enter the ADU, but fail to be picked up for
copying on their back side. This is caused by a failed spring clutch, located at the back of the
module. See Disassembly chapter. Bellow is the periodical maintenance list:
Periodical maintenance and replaceable parts
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