Illuminance Of Rear View Monitor Cannot Be Adjusted - Komatsu WA900-3E0 Shop Manual

Troubleshooting for machine monitor (M-mode)
M-4 Illuminance of rear view monitor cannot be adjusted
M-4 Illuminance of rear view monitor cannot be adjusted
Detail of failure

Illuminance of rear view monitor cannot be adjusted

q
Illuminance of rear view monitor can be adjusted in seven steps separately in the cases where clear-
q
Related infor-
ance lamp is turned off and turned on. Adjusted illuminance values are saved in monitor even if start-
mation
ing switch is at ON or OFF position.
No. Cause
Defective rear view monitor
1 (when voltage measured at power
supply pin is normal)
Open circuit in wiring harness
2 (wire breakage or defective con-
tact of connector)
Defective reverse-Interlock switch
3
(Internal open circuit)
40-80
Procedure, measuring location, criteria and remarks
1) Turn starting switch to OFF position.
2) Disconnect CA7 and connect T-adapter.
3) Turn starting switch to ON position, set reverse-interlock switch to
reverse-interlock position, then perform troubleshooting.
Between CA7 (5) and (2)
Between CA7 (5) and (2)
Voltage
Between CA7 (6) and (2)
Between CA7 (6) and (2)
1) Turn starting switch to OFF position.
2) Disconnect CA7 and CA6
Between CA7 (female) (5) and CA6 (female) (4)
Resistance Between CA7 (female) (6) and CA6 (female) (6)
Between CA7 (female) (12) and CA6 (female) (5)
1) Turn starting switch to OFF position.
2) Disconnect CA7 and CA5.
Resistance Between CA7 (female) (7) and CA5 (female) (4)
1) Turn starting switch to OFF position.
2) Disconnect CA6
Between CA6 (female) (5) and (6)
Between CA6 (female) (5) and (6)
Resistance
Between CA6 (female) (5) and (4)
Between CA6 (female) (5) and (4)
4 0 - 8 0
20 to 30 V
during illumi-
nance increase
adjustment
Max. 1 V
during illumi-
nance decrease
adjustment
20 to 30 V
during illumi-
nance increase
adjustment
Max. 1 V
during illumi-
nance decrease
adjustment
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
MAX. 1 z during
illuminance
increase adjust-
ment
MIN. 1 Mz dur-
ing illuminance
decrease adjust-
ment
MAX. 1 z during
illuminance
increase adjust-
ment
MIN. 1 Mz dur-
ing illuminance
decrease adjust-
ment
WA900-3E0