4 • Troubleshooting/Diagnostics
DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)
This chapter explains how to troubleshoot the DM300c/DM400c/DM450c/
DM475. It includes troubleshooting charts, and a list of error codes and their
meanings. It also includes instructions for withdrawing the mailing machine
Chapter 3, Theory of Operation, contains valuable information that can help
you analyze a problem and isolate the cause. A good understanding of ma-
chine timing is very helpful in this respect.
Before troubleshooting the equipment, check that the customer's material
falls within the specifications published in Chapter 2 of this manual. You can
often trace frequent feed failures to substandard or out-of-spec material or
to improper feeding techniques on the part of the operator.
If the problem involves poor print quality, run a test print (Menu > Scroll
Down > Maintenance > Printer Maintenance > Print Test Pattern) and evalu-
ate the sam ple. If the test print is not acceptable, select No, Clean Nozzle
when prompted. This action automatically runs the manual maintenance
functions. Repeat the maintenance procedure if necessary.
The mailing system has a resident diagnostic program accessible through
the service menu (see Chapter 6 - Service Menu). Service representatives
can use the program to query the system for certain information and also to
test specific functions.
Tables 4-1 through 4-11 present troubleshooting information for:
Power On and Initialization Faults
Automatic Feeder Faults (DM400c/DM450/DM475)
Transport Faults (DM300c)
Tape Feeder Faults
Carriage Movement Faults
Postage By Phone Errors
Integrated Scale Faults
The system can display a number of error messages that describe fault
conditions. Table 4-12 is a general summary of these messages arranged
by their most significant digits. Tables 4-13 through 4-21 list all codes, ar-
ranged by class. They may help you to isolate a problem further and pro-
vide helpful data should engineering analysis be required.