Chapter 4; Troubleshooting - Bematech MP-4000 User Manual

MP-4000 TH . Revision 1.2

Chapter 4

Troubleshooting

The following table describes some of the problems that may occur while using the printer. For
every problem there is a possible cause and a suggested procedure to solve the problem.
Problem
The printer does not turn on.
The printer does not respond
to the commands.
Communication is faulty.
The LEDs are blinking.
Poor printing.
Possible Cause
There is no power in the
electric outlet.
Possible problem with the
power cord – it may be
broken or not well connected
to the printer and / or outlet.
The communication cable has
one or more lines with faulty
connections / broken wires.
Wrong programming
sequences.
The communication cable has
one or more lines with faulty
connections / broken wires.
The pin layout does not follow
the correct protocol.
The baud rate is incorrectly
set.
The printer informs you its
status
Paper dust and paper residues
on the print head can
influence printing quality
Wrong print density
configuration
Procedure
Check if there is a central switch for the room /
outlets. Connect any other equipment to the outlet
to check its operation.
Turn off the printer;
continuity and a perfect connection between the
printer and the electric outlet.
Check for a good connection between the printer
and the host or change the communication cable.
The programming sequences can be checked in the
dump mode. Put the printer in dump mode and run
your application again. The printer will show the
hexadecimal and ASCII codes of all bytes being
received from the host.
Check the command set that the printer are
configured.
You can configure to Bematech or ESC/POS
Check for a good connection between the printer
and the host or change the communication cable.
Check if the adopted pin layout complies with the
protocol being used for data transmission. Cables
and Dip switches.
If the baud rate set in the printer is different from
the host's baud rate, the printer will print random
characters or not print at all. Check carefully the
host's serial baud rate configuration as well as the
printer's Dip switches settings.
Check the LED Table at chapter 3.
A yellow light means an error that you can fix
easily.
Generally a red light means that you have to call
for assistance.
Clean the print head as described at chapter 3.
You can configure the print density to Normal,
Strong, Very Strong, Very Weak or Weak Print
Density.
This configuration is very important when you use
different paper thicknesses.
check the power cord
TM
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