Komatsu PC200-8M0, Shop Manual

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304 Troubleshooting by failure code, Part 4
Failure code [DR21KX] Camera 2 Picture Rev. Drive Abnormality
40-304
30
PC200, 200LC, 220, 220LC-8M0
SEN06136-00
Failure code [DR21KX] Camera 2 Picture Rev. Drive Abnormality
Action
level
Failure code
Failure
Camera 2 Picture Reverse Drive Abnormality
(Machine monitor system)
L01 DR21KX
Detail of failure
q
Output voltage of camera 2 image reverse drive line (pin 6 of connector CM04) differs from com-
mand voltage output from machine monitor.
Action of con-
troller
q
Does not display image of camera 2.
Problem on
machine
q
Image of camera 2 is not displayed.
Related infor-
mation
q
When output voltage of camera 2 image reverse drive line (pin 6 of connect CM04) is 0 V, original
image is sent. When it is 8 V, mirror image is sent (since power supply voltage of camera is 8 V, 8
V is used as command voltage to sent mirror image).
q
You must check connector A41 to identify which camera is assigned to camera 2.
q
Method of reproducing failure code: Turn starting switch to ON position.
Cause Procedure, measuring location, criteria and remarks
1
Open circuit in wiring harness
(wire breakage or defective con-
tact of connector)
1. Turn starting switch to OFF position.
2. Disconnect connectors CM04 and A46, and connect T-adapters to each
female side.
Between CM04 (female) (6) and A46 (female) (3) Resistance Max. 1
z
Between CM04 (female) (5) and A46 (female) (4) Resistance Max. 1
z
2
Ground fault in wiring harness
(contact with ground circuit)
1. Turn starting switch to OFF position.
2. Disconnect connectors CM04 and A46, and connect T-adapters to either
female side.
Between ground and CM04 (female) (6) or A46
(female) (3)
Resistance Min. 1 M
z
3
Hot short circuit in wiring harness
(contact with 24 V circuit)
1. Turn starting switch to OFF position.
2. Disconnect connector A46 and connect T-adapters to female side.
3. Turn starting switch to ON position.
a
Check that camera 2 is set for original images.
Between A46 (female) (3) and (4), or between A46
(female) (3) and ground
Voltage Max. 1 V
4 Short circuit in wiring harness
1. Turn starting switch to OFF position.
2. Disconnect connector CM04, A46 and connect T-adapters to CM04 female
side.
Between CM04 (female) (6) and each pin other
than pin (6)
Resistance Max. 1
z
5 Defective camera 2
If no failure is found by above checks, camera 2 is defective. (Since this is an
internal defect, troubleshooting cannot be performed.)
6 Defective machine monitor
If no failure is found by above checks, machine monitor is defective. (Since
this is an internal defect, troubleshooting cannot be performed.)