Xerox 7142, Service Manual

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RJ-901C/RJ-900C Maintenance Manual 9 Troubleshooting
9-17
9.2.4 Command Errors
This section describes the message contents of command errors as well as the check items and recovery
actions.
These errors are displayed when an abnormal condition is found during analysis of PC command data.
Upon an occurrence of a command error, the machine stops its operation at the same time.
The error can be cancelled by removing the error causes. After that, the machine will restart its operation.
Table 9-5 Symptoms and Check Items for Command Errors
No. Message Event/
symptom
Check item Action Reference
1 MH 01 Error
Command [ ] Undefined
command:
Command
being analyzed
is not defined
in applicable
command
mode.
1. Attempt
communication
using PC and cable
on hand.
2. Is there any error
statement in
printing data?
3. Does the symptom
remain the same
even if application
driver is replaced?
4. Main board
assembly may be
defective.
• Contact our
customer support
center.
• Replace application
driver
• Obtain printing
data.
• Contact our
customer support
center.
• Replace main board
assembly.
"4.3.3
Replacing
Main Board
Assembly"
p.4-21
2 MH 02 Error
Command [ ] Parameter
error:
Number of
parameters
following
command is
inappropriate.
3 MH 03 Error
Command [ ] Numeral value
error:
Number of
parameters
following
command is
inappropriate.
4 MH 04 Error
Command [ ] Undefined
character set:
Unknown
character set is
present.
5 MH 07 Error
Command [ ] Buffer
overflow:
Polygon buffer
or
downloadable
character
buffer
overflows.