Hitachi UC 18YRL Technical Data And Service Manual page 20

(4) Trouble mode (D)
Pilot lamp flickers red,
indicating abnormality.
connected in reverse
sort of conductive foreign
matter in the hole where the
Is the battery short-circuited
Faulty internal circuit
Is the battery
direction ?
NO
Is there some
battery is inserted ?
NO
or opened ?
NO
Replace PCB.
YES
Install battey in correct
direction.
YES
Remove foreign matter.
YES
Replace the battery.
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