Roma Medical Shoprider, Service Manual, Page: 13 / 27

9. Brake Removal And Testing
The electromagnetic brake is located on the end of the motor and
can be removed by undoing the three screws.
When 24v is applied, the brake will release allowing the powerchair
to drive (this can be heard by an audible ‘click’). If the powerchair fails
to move there may be a problem with the joystick controller or the
brake itself may be faulty. Use a multimeter to determine if 24v is
reaching the brake when the throttle is applied. If there is 24v
measured at the plug and the brake fails to operate the brake is
either faulty or possibly stuck.
It is easier to diagnose brake faults when the brake is removed from
the motor as you can see the internal mechanism physically release
and lock. A brake may stick if the powerchair has not been used for a
prolonged period of time. If power is reaching the brake but it does
not release check to see if there is any corrosion inside the end of the
brake (by the plate with the hexagonal hole). If necessary, use a
release agent such as WD40 to lubricate the brake and re-apply
power to try and release the brake. If the brake is releasing you will
be able to move the internal plate with the hexagonal cutout when
power is applied. The brake should show continuity when tested
with a multimeter – if this is not the case, replace the brake.
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