Makita DC1804 Technical Information page 2

R
epair
< 1 > The circuit board cannot be repaired, because the circuit itself is molded on the board .
It has to be replaced entirely with new one.
< 2 > In case of damaged varistor or fuse, they can be repaired according to the following procedure without
replacing the circuit board.
(1) How to find broken varistor
a. In case that the surface of varistor has broken or has become black, and fuse (F1) has been disconnected,
the varistor has been damaged.
b. Varistor can be damaged easily, if the charger is plugged in a double voltage of the rating one.
c. In case of no damaged varistor but disconnected fuse (F1), the charger can be broken for other reason.
The circuit board has to be replaced in this case.
(2) How to find broken fuse (F2)
a. If the charging light flashes alternately red and green, when the battery has been inserted into the charger
connected with power source, fuse (F2) may be broken.
b. If the easily conductive material other than battery would be connected with charger's terminals
by mistake, fuse (F2) can be easily broken by short circuit in the charger.
c. In case of no damaged fuse (F2) but charging light flashing alternately red and green, the charger can be broken
for other reason. The circuit board has to be replaced in this case.
Top view of circuit board
Power supply cord
LED1
TH1
LED2
L1
C2
T1
C1
VS1
Q1
F1
Varistor
Fuse (F1)
CN1
F2
Fuse (F2)
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