Hitachi UC 18YRL Technical Data And Service Manual page 18

(2) Trouble mode (B)
Red pilot lamp does not stay lit
(continues to flash) after battery
has been connected.
Are the connection terminals
of the charger or the battery dirty, deformed,
or otherwise abnormal ?
Check with tester.
Is the resistance between
(S) and (
2 KΩ to 100 KΩ ?
Is the fuse on secondary side blown ?
Faulty internal circuits
NO
--- ) terminals
YES
NO
Replace PCB.
YES
Remove dirt or
correct abnormality.
NO
Replace the battery.
YES
Replace the fuse.
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