Barrett Jewel, Technical Manual

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4.2.10 Switch off the controller, hold the joystick forward and switch the controller on; the
powerchair must not drive. Release the joystick for two seconds and then the powerchair
will drive normally.
4.2.11 Slowly drive the powerchair up a maximum 1 in 6 gradient and attempt to accelerate.
The powerchair will climb at normal speed.
4.2.12 Reverse down a 1 in 6 slope and check that the powerchair will come to a halt if the joystick
is released.
4.2.13 Whilst driving slowly up the gradient release the joystick and check that the powerchair
does not roll back excessively before the automatic parking brakes come on.
4.2.14 Check that all cables are connected to the controller, batteries, motors and brakes.
4.2.15 Check that the circuit breaker push buttons on the battery boxes have not sprung out.
4.2.16 Check that the free wheel devices are releasing and engaging correctly.
4.3. Check that controller rubber gaiter and switch cover are in good condition.
4.3.1 Check the insulation condition of all cables.
4.3.2 Check that the controller is securely mounted.