TROUBLE SHOOTING
Keyboard
The keyboard is used to deactivate the theft alarm and to enter the security code and to change limit values for a number of the lawn mower’s parameters.
If the keyboard ceases to beep when the keys are pressed this can be due to, in addition to a discharged battery and/or insufficient light, bad contact between the cables and the connectors on the circuitboard.
The keyboard is attached to the box using
!WARNING! The box must not be washed while electronic equipment is fitted.
Generator and loop cable
The generator is used together with the loop cable to form an electromagnetic enclosure that the lawn mower senses and keeps within.
The lawn mower gives a signal of 3 beeps/sec. if it does not sense the electromagnetic field emitted by the loop cable. The problem can be due to the sensor under the front of the lawn mower being faulty, or the generator and/or loop cable also being faulty. If the cable has been routed in the wrong direction around "islands" then this will extinguish the electro- magnetic field.
Metal objects and electrical cables on the lawn can weaken the loop cable's electromagnetic field. If the lawn mower only signals 3 beeps/second in certain areas of the garden this can mean that it's experiencing a disturbance in just this area. Try moving the loop cable. Sharp bends (90 degrees) in the loop cable bring about a weakened electromagnetic field and this can result in the lawn mower escaping (see diagram).
Sharp cable bends = risk of escaping.
Gentle bends give a stronger electromag- netic field.
If the loop cable is correctly connected a signal should be given when the momentary switch on the generator makes. If the generator does not give a signal, start by bridging the generator using a piece of cable and make the generator's switch again. If a signal is now heard then the loop cable is not correctly connected or there is a break in the loop cable. Start by check- ing the cable's connection to the generator. If the cable is corroded, cut and strip it so that a good contact is obtained. Measurement of the loop cable's resistance is carried out with the cable disconnected from the generator. The resistance should be max. 2 ohm/100m per loop cable (max. loop cable length is 500 m).
If a cable break is established, (R=infinity), start by checking the joints and the transition between ground and air. (For damp and
535 04 43-01
The easiest way to check the operation of the generator is to measure the current flow in series with a functioning loop cable. There is a risk, with a measurement value under 7mA AC, that the electromagnetic field will be too weak.
Check that the cables and connections inside of the generator are correct. Another quick check is to test using a new battery (allow to charge in daylight).
A > 7mA AC
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