Troubleshooting Guide; Troubleshooting Based On Pilot Lamp Indications; Troubleshooting And Repair Procedures - Hitachi UC 18YK Technical Data And Service Manual

9. TROUBLESHOOTING GUIDE

9-1. Troubleshooting Based on Pilot Lamp Indications

Phenomenon
Pilot lamp fails to light after
battery connection

9-2. Troubleshooting and Repair Procedures

(1)Trouble mode
Pilot lamp fails to light or flash
Rated
voltage applied
to plug ?
YES
Check with tester
Any continuity
between AC cord plug
blades?
YES
Suspected causes
(1) Faulty AC cord
(2) Blown fuse (3.15 A)
(3) High battery temperature
(4) Poor terminal connection
(5) Faulty battery
(6) Faulty PCB
NO
Apply rated voltage
NO
Replace fuse
-8-
Refer to trouble mode
Open circuit in
AC cord?
NO
YES
Blown fuse?
NO
A
Check procedure
YES
Replace AC cord