Service manual

3 • Theory Of Operation
DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)
3-11
Sequence of Operation
The mailing machine is equipped with a sophisticated motion control system
that continuously monitors envelope or tape strip position along the trans-
port and triggers all key operations at the appropriate time in the machine
cycle.
The motion control system is designed to:
• Detect the presence of a stack (DM400c) or an envelope or tape strip;
• Move the print carriage assembly from the home to the print position
and initiate a purge (type E—see Table 3-2), if necessary;
• Start the transport;
• Measure envelope length;
• Maintain a consistent gap between pieces;
• Detect feed failures, jams and skew conditions and set the appropriate
error flag;
• Trigger the meter debit process;
• Initiate printing;
• Repeat the process or return the print carriage to the home position.
3.4 Envelope/
Tape Transport