User Manual

3. Unscrew the screw to remove the brush lead. The old carbon brush may now be lifted away.

4. Install a new brush. Installation is the reverse of removal.

5. Replace the motor tail cover.

CARBON BRUSHES

Due to the brush design, if the machine comes to a stop without any

reason, the brushes have to be checked. The brush design stops the

machine before the carbon brushes are finished and protects the

motor.

MAGNET TROUBLESHOOTING

Full magnet performance is absolutely essential for magnetic drill operation.

If the magnet works, but does not hold well, it is likely that one of the coils has failed. If the magnet does not

work at all, it is likely to be a failed rectifier. (It is highly unlikely that both magnet coils would fail at the same

time)

NOTE: A faulty magnet coil can also damage the rectifier, so whenever there is a magnet problem, BOTH the

magnet coils and rectifier must be checked.

WARNING: Never attempt to operate a magnetic drill with a faulty magnet!

CHECKING THE MAGNET (qualified technicians only)

If the magnet is not working well, it must be checked. Separate the wires of each indiviual coil and test the

resistance of each coil separately. (note that 110V models are wired in parallel and 230V models are wired in

series) The resistance of the coils of different sizes of magnets varies, but it should be in the region of hundreds

of ohms. Most importantly, both coils must have very nearly the same resistance. If one of the coils has zero

resistance, it means that it is shorted. If one of the coils has infinite resistance, it means that the circuit is

broken. If either coil has a problem, the magnet must be replaced. A faulty magnet may also cause damage to

the rectifier. Also check the rectifier when replacing a faulty magnet. (see below)

CHECKING THE RECTIFIER (Qualified technicians only)

The rectifier takes the AC household current and converts it to DC to power the magnet. If it fails, the magnet

coils will not receive power.

Disconnect the rectifier and test the resistance of both circuits of the rectifier between the AC and the DC sides.

Note that polarity matters, so you can only take a reading if test probes are oriented correctly. Each side will be

the opposite of the other. Both circuits should have very nearly the same resistance reading. If one of the