Caution Buzzer Does Not Stop - Komatsu PC130-7 Shop Manual

TROUBLESHOOTING
E-22 Caution buzzer does not stop
Trouble

• Caution buzzer does not stop.

Related • The input state (ON/OFF) from the caution buzzer stop switch can be checked with the monitoring func-
information tion. (Code: 045, Right of upper line)
Defective caution buzzer
1 stop switch
(Internal disconnection)
Disconnection in wiring
harness
2 (Disconnection in wiring
Possible causes
harness or defective
and standard
contact in connector)
value in normal
state
Short circuit with power
3 source in wiring harness
(Contact with 24-V circuit)
5 Defective monitor panel
20-442
(1)
Cause Standard value in normal state/Remarks on troubleshooting
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
P03 (female)
Between (1) and (2)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Wiring harness between P02 (female) (16) and
P03 (male) (1)
Wiring harness between P03 (male) (2) and
J05 and chassis ground (A13)
aPrepare with starting switch OFF, then turn starting switch ON and car-
ry out troubleshooting.
Between P02 (female) (16) – P03 (male) (1)
wiring harness and chassis ground
aPrepare with starting switch OFF, then turn starting switch ON and car-
ry out troubleshooting.
Between (16) and
chassis ground
Caution buzzer
stop switch
Released
Pressed
Caution buzzer
P02
stop switch
Released
Pressed
E-22
Resistance
Min. 1 Mz
Max. 1 z
Max. 1 z
Resistance
Max. 1 z
Resistance
Voltage Max. 1 V
Voltage
20 – 30 V
Max. 1 V
PC130-7