Service manual

4 • Troubleshooting/Diagnostics
4-6 DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)
Fault Checkpoints Possible Causes/Solutions
Transport fails to
drive, PS1 okay
(continued).
Drive shaft fails to turn. Drive shaft is binding. Check pulleys. Make sure they are securely
mounted on shaft.
Transport drive belt. Check belt for proper tracking. Check for wear,
glazing, cracks, etc.
Lower transport problems. Make sure lower transport locks in operating
position and that idlers contact transport drive
belt. Check that all idlers are correctly posi-
tioned and turn freely
.
Inconsistent gap
between pieces.
Speed variations in transport. Check distance encoder function.
Frequent jams. Debris in transport; envelope thickness out of
spec.
Check transport, clean as required. Maximum
envelope thickness is 3/8 inch.
Frequent skews. Operator error. Instruct operator to make sure top edge of mail
piece is against registration wall. Customer
should not hold on to mail as he or she feeds it
onto deck. If oversized mail piece, use a tape
strip.
No printing
occurs.
Envelope blank, no errors. Check ink cartridge. Perform purge. Clean elec-
trical connections; check electrical connections.
4.2 Troubleshooting Tables
Table 4-4 Mailing Machine Transport Faults (cont’d)