Komatsu PC130-7, Shop Manual

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PC130-7
20-421
TROUBLESHOOTING
E-10 No items of monitor panel light up
Circuit diagram related to monitor panel power supply
Trouble • No items of monitor panel light up.
When the starting switch is turned ON, no items of monitor
panel light up.
Related
information
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1 Defective fuse No.12
If the fuse is broken, the circuit probably has a grounding fault, etc.
(See cause 3.)
2
Disconnection in wiring
harness
(Disconnection in wir
ing harness or defective
contact in connector)
a
Prepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Wiring harness between FB1-12 outlet and J07
and P01 (female) (1), (2)
Resistance Max. 1
z
Wiring harness between P01 (female) (6), (7)
and chassis ground (A11)
Resistance
Max. 1
z
3
Short circuit with chassis
ground in wiring harness
(Contact with ground
circuit)
a
Prepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between FB1-12 outlet – J07 – P01 (female)
(1), (2) wiring harness and chassis ground
Resistance
Min. 1 M
z
4 Defective monitor panel
a
Prepare with starting switch OFF.
P01 (female) Starting switch Voltage/Resistance
Between (1), (2) and
chassis ground
ON 20 – 30 V
Between (6), (7) and
chassis ground
OFF Max. 1
z
E-10
(1)