Komatsu BR380JG-1E0, Shop Manual, Page: 729 / 841

SEN02095-00 40 Troubleshooting
44
BR380JG-1E0
E-20 One-touch start, stop switch cannot be operated by radio control 1
Trouble • The crusher cannot be turned ON and OFF by radio control.
Relative
information
• Radio control system is an optional specification.
• (1) Start the engine and turn the radio control selector switch to the remote control position, (2)
Turn the power switch of the radio control transmitter ON, (3) Check that the radio wave from the
radio control transmitter is received by the receiver (The antenna of the receiver is built in). If the
radio wave is received, the yellow radio control lamp lights up and the machine can be radio-con-
trolled.
• If the mode selector switch is set in the WORK position under the above condition, the work equip-
ment can be operated.
• The machine does not work on the conveyor up position.
• The work equipment starts up in linear sequence when the one-touch start switch is pressed within
about 30 seconds after the working mode selector switch of radio controller is pressed.
• It is not necessary to press the selector switch beforehand when the one-touch start switch of radio
controller is being pressed.
• If any of (1), (2), and (3) above is not established (If the radio control lamp does not light up), the
machine cannot be radio-controlled.
Possible
causes and
standard value
in normal state
Cause Standard value in normal state/Remarks on troubleshooting
1 Defective fuse No. 13 If the fuse is broken, the circuit probably has a grounding fault.
2
Defective radio control
power supply circuit
(Disconnection or short
circuit)
a
Prepare with starting switch OFF, then turn starting switch ON and carry
out troubleshooting.
Receiver connector
A33 (female)
Radio control
selector switch
Voltage
Between (1) – (2)
Panel Max. 1 V
Remote control 20 – 30 V
If the above power supply circuit is found to be defective, carry out troubleshooting for 2-1 to 2-4 below.
2-1
Defective radio
controller selec-
tor switch (Inter-
nal disconnection
or short circuit)
a
Prepare with starting switch OFF, then carry out troubleshooting without
turning starting switch ON.
Radio controller selec-
tor switch B50 (male)
Radio controller selec-
tor switch
Resistance
(2) – (4)
Panel Min. 1 M
z
Remote control Max. 1
z
2-2
Disconnection in
wiring harness
(Disconnection or
defective contact
in connector)
a
Prepare with starting switch OFF, then carry out troubleshooting without
turning starting switch ON.
Between B28 (13) – A20 (1) – A44 (1) – A33
(female) (1)
Resistance Max. 1
z
Between B50 (female) (2) – A20 (2) – A44 (2) – A33
(female) (2)
Resistance Max. 1
z
2-3
Grounding fault in
wiring harness
(Contact with
ground circuit)
a
Prepare with starting switch OFF, then carry out troubleshooting without
turning starting switch ON.
Between wiring harness B28 (13) – A20 (1) – A44
(1) – A33 (female) (1) and chassis ground
Resistance Min. 1 M
z
Between wiring harness A33 (female) (16) –
RR04 (female) (2) and chassis ground
Resistance Min. 1 M
z
2-4
Hot short circuit
in wiring harness
(Contact with 24V
circuit)
(Troubleshooting
with radio control-
ler selector
switch turns to
Panel.)
a
Prepare with starting switch OFF, then turn starting switch ON and carry
out troubleshooting.
Between wiring harness B50 (female) (2) – A20
(2) – A44 (2) – A33 (female) (2) and chassis
ground
Voltage Max. 1 V