E-16 Alarm Buzzer Does Not Sound Or It Keeps Sounding - Komatsu WA250-6 Shop Manual

SEN03848-00

E-16 Alarm buzzer does not sound or it keeps sounding

Contents of
• Alarm buzzer does not sound or it keeps sounding.
trouble
• Disconnection or ground fault in alarm buzzer output circuit
Related
• The output state (ON/OFF) from the alarm buzzer to the machine monitor can be checked with the
information
monitoring function (Code: MONITOR PANEL 40952, D-OUT-0).
• If failure code is indicated, carry out troubleshooting for it first.
Defective fuse No.6 of fuse
1
box 1
Defective alarm buzzer
2
(Internal trouble)
Possible
causes and
Disconnection in wiring har-
standard value
ness
3
in normal state
(Disconnection or defective
contact in connector)
Ground fault in wiring harness
4
(Contact with ground circuit)
5 Defective machine monitor
68
40-400
Causes
If the fuse is burn, the circuit probably has a grounding fault, etc.
(See cause 4.)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
• Remove the buzzer then connect +24 V to L46 (male) (1) and
GND to L46 (male) (2).
Alarm buzzer sounds
Alarm buzzer does not sound
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between fuse No. 6 of fuse
box FS1 – L46 (female) (1)
Wiring harness between L46 (female) (2) –
L24 (female) (14)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between fuse No. 6 of fuse
box 1 – L46 (female) (1), – circuit branch end
and ground
Wiring harness between L46 (female) (2) –
L24 (female) (14) and ground
• When above 1 – 4 are normal, failure on the machine monitor can
be suspected.
400 Troubleshooting of electrical system (E-mode)
E-16 Alarm buzzer does not sound or it keeps sounding
Standard value in normal state/Remarks on troubleshooting
1
Alarm buzzer is
normal
Defective alarm
buzzer
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis- Min.
tance 1 Mz
Resis- Min.
tance 1 Mz
WA250, 250PZ-6