Electrical Overview - Dyson DC21 Service Manual

A reading of > 2MΩ is accepted.
2MΩ is the minimal legal requirement. A reading of below 2MΩ is not considered safe and further investigation
and rectification must be made before the product is used. The following components must be visually inspected:
• Cable rewind assembly, both internal and external
• Switches
• PCB assembly
• Motors
• Carbon build up in the motor housings
If you cannot repair a product with an insulation test reading of below 2MΩ you must
inform the customer that it is unsafe to use. Please inform the customer of the required
actions to repair the product (including the charge structure). If the product is left
un-repaired please indicate on your paperwork/hand held device that the product is
electrically unsafe!

Electrical overview

Plugging the powercord into a suitable electrical outlet and pressing the on/off actuator will always turn on
the vacuum and brushbar motor simultaneously. Pressing the brushbar actuator will turn the brushbar motor
off. Pressing the brushbar actuator whilst the brushbar motor is off will turn the brushbar motor on again.
Note: for safety purposes, if the product is unplugged from the electrical outlet without turning the product
off at the on/off actuator first, the brushbar will fail to turn upon plugging the product back into the
electrical outlet. To activate the brushbar it will be necessary to switch the product off and then on again at
the actuator.
The vacuum motor is fitted with a heat sensitive Thermal Cut-out (TCO). This will shut the motor down to up
to 60 minutes if it reaches a temperature >96 degrees. Excessive temperatures within the motor are usually
caused by machine/filter blockages.
The brushbar motor is protected by a current overload switch that turns off power to the brushbar motor if
the brushbar is obstructed (usually caused by a blockage around the brushbar or within the brush housing).
The obstruction must be cleared and the motor reset by pressing the brushbar actuator. If the cause of the
obstruction is not cleared the overload switch will continually activate.
For added protection the underside of the power floor tool assembly neck contains a stow microswitch that
is activated when the floor tool is stowed (stored) on the rear of the product. When activated the brushbar
motor will not operate.
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