Information Contained In Troubleshooting Table - Komatsu Galeo PC800-8 Shop Manual

40 Troubleshooting

Information contained in troubleshooting table

a Troubleshooting Table and Related Circuit Diagram collectively carry the following information. Carry out
troubleshooting work after fully grasping their contents.
Failure
Phenomenon occurring on machine
phenomenon
Relative
Information on the failure occurred as well as the troubleshooting
information
1
2
Possible causes
Possible causes of trouble
and standard
(Given numbers are refer-
value in normal
3
ence numbers, which do
state
not indicate priority)
4
5
Relative Electrical Circuit Diagram
This is part of the electrical circuit diagram which shows the portion
where the failure occurred.
• Connector No.: Indicates (Type – numbers of a pin) (color)
• Arrow : Roughly indicates the location in the machine where it is
installed.
PC800, 850-8
Cause Standard value in normal state/Remarks on troubleshooting
<Contents of description>
• Standard value in normal state to judge possible causes
• Remarks on judgment
<Troubles in wiring harness>
• Disconnection
Connector is connected imperfectly or wiring harness is broken.
• Ground fault
Wiring harness which is not connected to chassis ground circuit is
in contact with chassis ground circuit.
• Hot short
Wiring harness which is not connected to power source (24 V) cir-
<Precautions for troubleshooting>
(1) Method of indicating connector No. and handling of T-adapter
Insert or connect T-adapter as explained below for troubleshoot-
ing, unless otherwise specified.
• If connector No. has no marks of "male" and "female", disconnect
connector and insert T-adapters in both male side and female side.
• If connector No. has marks of "male" and "female", disconnect con-
nector and connect T-adapter to only male side or female side.
(2) Entry order of pin Nos. and handling of tester leads
Connect positive (+) lead and negative (–) lead of tester as
explained below for troubleshooting, unless otherwise specified.
• Connect positive (+) lead to pin No. or wiring harness entered on
front side.
• Connect negative (–) lead to pin No. or harness entered on rear
side.
SEN00793-02
5