Failure Code [Daf8Kb] Camera Power Supply Short Circuit - Komatsu PC88MR-10 Shop Manual

Failure code [DAF8KB] Camera Power Supply Short Circuit

Z0-A)
Action level Failure code
L03 DAF8KB
Detail of Output power supply voltage from machine monitor to camera (rated voltage is 8 V) drops
failure to 6.0 V or less or increases to 10 V or more.
Stops driving power supply voltage to camera (rated voltage is 8 V).
Action of
Even if cause of failure disappears, machine does not become normal until starting switch
machine
is turned to OFF position.
monitor
Problem on
Camera image is not displayed on monitor screen.
machine
Related
Method of reproducing failure code: Turn starting switch to ON position.
information
No. Cause
Defective camera
1
(internal short circuit)
Defective machine
2
monitor
Ground fault in wiring
harness
3
(contact with ground
circuit)
Hot short circuit in
wiring harness
4
(contact with 24 V
circuit)
Circuit diagram related to camera power supply
PC88MR-10
Camera Power Supply Short Circuit
Failure
(Machine monitor system)
Procedure, measuring location, criteria, and remarks
1. Turn starting switch to OFF position.
2. Disconnect camera connector A45, and turn starting switch to ON
position.
After disconnecting camera connector and performing failure code
reproducing procedure, if failure code disappears, camera has internal defect.
1. Turn starting switch to OFF position.
2. Disconnect connector CM04.
3. Connect T-adapter to male side of connector CM04.
4. Turn starting switch to ON position.
Voltage Between CM04 (male) (1) and ground
1. Turn starting switch to OFF position.
2. Disconnect connector CM04 and camera connector A45.
3. Connect T-adapter to female side of connector CM04.
Resistance Between CM04 (female) (1) and ground
1. Turn starting switch to OFF position.
2. Disconnect camera connector A45.
3. Insert T-adapter into connector CM04.
4. Turn starting switch to ON position.
(Disconnect camera and check that camera is not defective in advance.)
Voltage Between CM04 (1) and (5)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
(PC88MR-DAF8KB-400-A-
6 to 10 V
Min. 1 Mz
Max. 10 V
40-273