The display on a Kobelco SK220xDLC-10 excavator was staying on even after turning the key off. After troubleshooting, it was found that the alternator regulator was faulty, causing current to continue reaching the display when the switch was off. Replacing the regulator with a new one from another machine confirmed the diagnosis. The customer was advised to replace the faulty regulator as a permanent solution.

1. KOBELCO
Dealer name: Rao Constructions Prepared by: Suresh Vishwkarma
Complain: Electric Problems
Machine Model: SK220xDLC-10 ( YQ15 -B6343 ) HMR: 12869 hours
Symptoms: the Display stays, on even after turning the key off
Application: stone work Attachment: Bucket
Trouble Shooting steps Data sheet/ Circuit ref./ Parts
Photo
1 Check the machine, the Current is reaching the
Display (monitor) even after the switch is off.
2 Display turns off when the relay is removed.
3 All fuses relay check, wiring check found ok
4 Suspected Alternator Regulator to not be working
properly.

2. Cause: Internal failure of regulator (faulty regular)
Correction: another alternator fitment for temporary
work
Trouble Shooting steps Data sheet/ Circuit ref./ Parts Photo
5 Took the Alternator of Another machine and
installed it in this machine (for checking
purpose)
6 After fitting this Alternator, Display turns on/off
as per the switch.
7. Advice the customer to Buy and Replace the
Regulator at the earliest, (proud)
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