Swing Holding Brake Does Not Operate Properly - Komatsu PC200-8M0 Shop Manual

400 Troubleshooting of electrical system (E-mode)
E-21 Swing holding brake does not operate properly
E-21 Swing holding brake does not operate properly
Failure 1) When swing brake cancel switch is set to CANCEL position, machine cannot swing.
q
Related infor- Signal of swing lock switch can be checked with monitoring function.
mation (Pump controller system code: 02200 Switch input 1)
Cause
1 Defective fuse F01-1
Defective swing brake can-
2 cel switch (internal short cir-
cuit)
Defective diode array D01 or
3
D03 (internal short circuit)
4 Defective wiring harness
Open circuit in wiring har-
ness
5
(wire breakage or defective
contact of connector)
Ground fault in wiring har-
6 ness
(contact with ground circuit)
PC200, 200LC, 220, 220LC-8M0
Procedure, measuring location, criteria and remarks
If fuse F01-1 is broken, circuit probably has ground fault. In this case, perform trou-
bleshooting for cause 6 first.
1. Turn starting switch to OFF position.
2. Disconnect connector S25 and connect T-adapters to male side.
Between S25 (male) (13)
and (14)
1. Turn starting switch to OFF position.
2. Remove diode arrays D01 and D03, and connect T-adapters to male side.
a Check the continuity in diode range.
Between D01 (male) (7) (+) and (3) (-)
Between D01 (male) (3) (+) and (7) (-)
Between D03 (male) (7) (+) and (3) (-)
Between D03 (male) (3) (+) and (7) (-)
1. Turn starting switch to OFF position.
2. Disconnect connector V03 and connect T-adapters to female side.
3. Turn starting switch to ON position.
Between V03 (female) (1)
and (2)
a If no failure is found by check on cause 4, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors V03 and S25 and connect T-adapters to each male side.
Between V03 (female) (1) and S25 (female) (14)
Between V03 (female) (2) and C02 (female) (115)
a If no failure is found by check on cause 3, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors S25, V03, D01 and D03, and connect T-adapters to
female side of V03.
Between V03 (female) (1) and ground
swing brake cancel switch:
Normal
swing brake cancel switch:
FREE
swing brake cancel switch:
FREE
swing brake cancel switch:
Normal
SEN06138-00
Resistance Min. 1 Mz
Max. 1 z
Resistance
Continuity
No continuity
Continuity
No continuity
Voltage 20 to 30 V
Voltage Max. 1 V
Max. 1 z
Resistance
Max. 1 z
Resistance
Resistance Min. 1 Mz
39
40-400