Sakai SW880-1, Shop Manual

Page: 215 / 428

11-005
TROUBLESHOOTING
1-2) Measuring resistance of harness (measuring resistance between terminal 1 of equipment A and terminal 2
of equipment B)
3 4 2 5 1
2 3 1
2 3 1
1 2 3 1 2 3 4 5
Equipment A
Connector A Harness
Ohmmeter
(tester)
Main power source
of equipment B
Ground of
equipment A
Signal from
equipment A
Power to
equipment A
Connector B
Equipment B
Equipment A
Equipment B
TS-10003
Inspection procedure
①
Disconnect the connectors of equipment A and equipment B.
②
Connect the test probe (+) to connector terminal 1 of equipment A and the test probe (-) to connector
terminal 2 of equipment B and measure the resistance. At this time, reversing the connector terminals
between the probes (+) and (-) does not make any difference in the measurement.
Criteria for harness defects
when there is no abnormality in the harness: Less than 10 Ω (measured value)
If there is any abnormality in the harness such as broken wire: 10 Ω or higher (measured value)
1-3) Measuring resistance of grounding wire (measuring resistance between terminal 5 of equipment B and
ground)
1 2 3 4 5
5 1
Connector A Harness
Ohmmeter
(tester)
Main power source
of equipment B
Equipment B
Battery
Equipment B
TS-10004
Inspection procedure
①
Disconnect the connector of equipment B.
②
Connect the test probe (+) to connector terminal 5 of equipment B and the test probe (-) to a machine
ground point (the bolt fastening the ground terminal or an unpainted portion on the body) and measure
the resistance. At this time, reversing the connector terminals between the probes (+) and (-) does not
make any difference in the measurement.
(NOTICE)
When measuring the resistance, connect the test probes to both ends of the portion to be
measured. Make also sure that no voltage is applied to the portion to be measured.
When measuring the internal resistance of equipment, be sure first to disconnect all harnesses
from the equipment.
When measuring the resistance of a harness, disconnect the equipment connected to both ends
of the harness.
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