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ELECTRIC HORN
(see
Fig. 126)
The electric horn fitted on the
..
V7
..
machine
Is a MARELLI T 12 DEIF type.
The
electric horn
ci
rcuit
consists
of: horn - pushbutton control,
located on
left
handlebar
- ground, the
latter
bei ng the
frame
of the machine.
Horn
is
provided with a diaphragm which Is set
into
vibration
by
means of an electromagnet.
Current
flowing thru electromagnet winding
ori-
ginates a magnetic field. thus attracting a keeper
which is secured
to horn diaphragm.
The
slight movement of
the keeper
flexes
the
diaphragm
and
at
the
same time
electromagnet
contacts
open.
In
this condition the
cu
rrent
does
not flow anymore thru the electromagnet
winding
,
the
keeper
Is
no more attracted and
diaphragm then returns to original position.
Contacts then close
again and a new cycle
starts.
The
continuous
flexure
of the diaphragm causes
a
vibration. thus originating the
sound of the
electric horn.
OVERHAUL AND REPAIR INSTRUCTIONS
If
electric
horn
is
faulty
in
operation or fails to
work
at
all.
before stripping down make sure
that possi
ble
cause
is not in some other part
of
the electrical system.
If electric
horn
fails
to
work check that
pushbut-
ton control is
not
fa
ul
ty
and
also
check co
n-
nections to headlight.
If
electric
horn gives
an irregular
sound
,
check
bolts
which
secure horn unit to
frame.
If
electric
horn sounds uninterruptedly, look
for grounded
contact
In pushbutton control or in connection
between pushbutton control
and electric
horn.
Should above inspections fail to
detect
the fault,
it
is
abvious that
the
cause lies
inside
electric
horn and in such case it is
suggested
to apply
to
an Authorized
Dealer.
To tune the
sound of
the electric horn, act on
adjusting
nut
(see
A
on Fig
.
126).
Fig. 126
-
Electromagnetic horn
(adjustable
block core type).
1.
Body·
2.
Call
-
3.
Core· 4. Breaker - 5. Keeper·
6.
Diaphragm·
7
Resounding disc.
·
1 13
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