HAKO Minuteman MAX RIDE 20, Service Manual

Page: 124 / 150

Page 125
RoboScrub Service Manual
CAUTION: These tests should only be performed by a qualified technician. Working with electricity can
be dangerous. When using jumper wires to help diagnosis an electrical component, care must be
exercised to prevent a short circuit from occurring. Do not allow the two test leads (jumpers) to touch
or personal injury or damage to the equipment will result.
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Where Used:
On all automatic scrubbers and battery powered burnishers and vacuums.
Purpose:
A diode is a one-way electrical check valve that prevents electrical current from flowing in one direction.
This allows us to protect a circuit and electrical components from electrical spikes. A diode also allows us
to prevent back feeding of current in a shared circuit.
How to Test:
To test a diode, you will need a continuity tester or an OHM meter.
To test the diode:
1). Put your OHM meter on the highest scale, i.e. R x 10,000 scale and “zero” out your meter and remove
the diode from the circuit.
2). Put the red lead of your OHM meter on the cathode side of the diode (the side with the silver or white
band - In Photo - Side “A” ).
3). Put the black lead from your OHM meter on the opposite side of the diode. (In Photo - Side B). Your
OHM meter or continuity tester should show no counting through the diode if it does, your diode is
defective and must be replaced.
4). Reverse the leads and check the diode again. The red lead should be on the “B” side as shown in the
photo, and the black lead should be on the cathode or a side of the diode. At this time your OHM meter or
continuity tester will show continuity.
NOTE: If the customer has had repeated tripping of the circuit breaker the breaker must be replaced
and the components in the circuit must be tested for excessive current draw. A circuit breaker valve
drops each time it is tripped.