Troubleshooting
16 AP-74700 – Rev. 1.0 – 10/03/2008
1.5 COMMAND ERRORS
Command errors are displayed when trouble occurs during analysis of the command data that is sent to this
product from the computer.
If a command error occurs, the following error messages are displayed and the printer stops.
Solve the problem to delete the error message and restart the printer.
No. Message Phenomenon Check point Action Refer to
1 MH01 error
command [ ]
Undefined ESC: A
command that has
not been defined in
command modes
was analyzed.
2 MH02 error
command [ ]
Parameter error:
Number of
parameters
following command
is incorrect.
3 MHO3 error
command [ ]
Numeric error:
Number of
parameters
following command
is incorrect.
4 MH04 error
command [ ]
Undefined letter set:
Letter sets that
should not exist (do
exist).
5 MH05 error
command [ ]
Buffer overflow:
Polygon buffer or
downloadable
character buffer
overflows.
Check the printing
data for contents
that may be judged
as an error.
The Mainboard
assembly may
have a problem.
• Try a different
drive for the
application
• Replace
Mainboard
assembly
• Replacing the
Mainboard
assembly
• HDD_Extensi
on board
assembly
• HEAD_DRV
board
assembly
• cooling fan
assembly
Notes
• The command codes for errors may be indicated between brackets [ ].
• For the settings on a computer, refer to the computer's operation manual.