Makita DFT087F Repair Manual page 28

Symptom
All charging lamps on the
charger do not light up.
Although Battery is set in place
on the charger, the charging
lamp on the charger keeps on
blinking in green.
Probable Cause
The charger is unplugged.
Power supply cord of the charger is
broken.
Fuse and/or Varistor on Circuit board
of the charger is broken.
Circuit board of the charger is broken.
Dust on the contacts of the battery or
the charger.
Connector(s) in the charger are
disconnected.
Lead wire(s) in the charger are broken.
Battery is broken.
Circuit board of the charger is broken.
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Corrective Action
Plug in the charger.
Check Power supply cord with an
ammeter, and if there is no electrical
continuity in it, replace it with a
new one.
When only Varistor is broken,
replace Varistor and Fuse.
When both Varistor and Fuse are
broken, replace them.
When only Fuse is broken, replace
Circuit board.
Replace Circuit board.
Remove the dust.
Connect it securely.
Check the wire(s) with an ammeter,
and if there is no electric continuity
in them, replace the wire(s).
Replace Battery.
Replace Circuit board.