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8 – English
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 self-adhesive tape,
which is why care should be exercised when the keyboard is
replaced and must be removed. All remaining adhesive should
be removed using acetone or a similar solvent but not white
spirit, to ensure the new keyboard is correctly attached.
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).
Gentle bends give a
stronger electromag-
netic field.
Sharp cable bends = risk
of escaping.
535 04 43-01
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
oxide-proof joints use jointing sleeves 535 04 43-01.) Use only
original loop cables from Husqvarna.
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
Eng-SOL VERK 98-01-15, 10.078