Service manual

4 • Troubleshooting/Diagnostics
DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)
4-7
Fault Checkpoints Possible Causes/Solutions
Failure to Feed
Tape Strips.
Operator may be loading tapes improperly. Check that operator is loading tapes properly
and in the correct orientation. See Operator
Guide. Also check that operator is not exceed-
ing hopper capacity (50 to 55 tapes).
Operator may be using substandard material. Check that tape strips meet PB published
specifications. Tape strips from other sources
are not recommended.
Debris in tape path. Check tape path for debris and paper frag-
ments. Clean as required.
Possible tape motor failure. Tape fails to feed,
but carriage moves to print position. No error
message appears.
Run a zero stamp. Does tape motor turn when
tape switch is pressed? If not, check motor us-
ing service diagnostics. If test fails, check tape
motor harness and connection at J117.
Tape drive roller worn or glazed. Check roller. Clean or replace as necessary.
Tape pressure plate. This small plate is spring-loaded and is de-
signed to apply force to the tape stack and
assist in separation. Check spring. Make sure
pressure plate is not binding.
Broken drive gears. Inspect gear train between tape motor and tape
drive roller.
Encoder sensor. Suspect the encoder sensor if no tape feeds
and the system locks up. Check connection at
Main Logic Board, J122.
Last few tapes
fail to feed.
Tape pressure plate may be hung up on bezel. Make sure pressure plate is not binding.
Tape Motor
Tape Drive Roller
Gear Train
4.2 Troubleshooting Tables
Figure 4-2 Tape Drive
Table 4-5 Tape Feeder Faults