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40 Troubleshooting
Related information on troubleshooting
Information in troubleshooting table
a The following information is summarized in the troubleshooting table. Before performing troubleshooting,
understand that information fully.
Action level
Failure code
Display on
Display on
machine
machine monitor
monitor
Detail of
Description of the failure detected by the machine monitor or controller
failure
Action of
An action that is performed to protect the system and devices when a failure is detected by
controller
the machine monitor or controller
A problem that appears as a failure on the machine as a result of an action (above) that is
Problem on
performed by the machine monitor or controller.
machine
Related
Information on occurred failure or troubleshooting
information
No.
Cause
1
Defective
Open or short circuit in wiring
2
harness
Open circuit in wiring harness
3
(wire breakage or defective
contact of connector)
Ground fault in wiring harness
4
(contact with ground circuit)
5
Hot short circuit
Short circuit in wiring harness
6
40-42
(ALL-5170-421-A-01-A)
Failure name displayed on the Abnormality Record screen
Failure
of the machine monitor
Procedure, measuring location, criteria and remarks
<Contents of description>
Procedure
Measuring location
a "Between A and B" denotes measuring values such as voltage
and resistance between A and B.
a "Between A and ground" means the measurement of voltage,
resistance or others between terminal A and the place which has
a continuity with chassis frame such as unpainted hexagonal
head bolt or bolt hole which has no rust, etc.
Criteria to judge probable causes (standard value), remarks
<How to use troubleshooting sheet>
Perform troubleshooting procedures in numerical order.
If the check result does not meet the criteria, the probable cause
described on the left column is the actual cause of the failure.
If the check result meet the criteria and there is no specific
instruction, proceed to the next step (cause).
If a defect is found and repaired, check that the defect has been
corrected.
<Failures in wiring harness>
Open circuit
Connection of connector is defective or wiring harness is broken.
Ground fault
A harness not to be connected to the ground (earth) circuit comes
into contact with the ground (earth) circuit or chassis accidentally.
Hot short circuit
A harness not to be connected to the power circuit comes into
contact with the power circuit accidentally.
Short circuit
An independent wire in the harness erroneously comes into contact
with another independent wire.
(poor insulation at connector and others)
(Rev. 2011/12)
PC88MR-10
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Troubleshooting
