© Mitsubishi Forklift Trucks 2013. All
© Mitsubishi Forklift Trucks 2013. All
rights reserved.
rights reserved.
Revision: B
Revision: B
Document ID: 615023
Document ID: 615023
122 (244)
122 (244)
PBV20N2
PBV20N2
Service
Service Manual
Manual
8.7
8.7
Horn
Horn
Figure 71. Horn
Figure 71. Horn
Type
Type
AMA S.P.A horn
AMA S.P.A horn
V
V
s
s
24 Vdc
24 Vdc
Electrical wiring
Electrical wiring
Quick connect terminals 6.3 x 0.8 mm
Quick connect terminals 6.3 x 0.8 mm
Spare part
Spare part
RL604758
RL604758
If the horn does
If the horn does not work properly, disconnect it and then measure with a
not work properly, disconnect it and then measure with a multimeter
multimeter
that the horn is
that the horn is not broken. Set the multimeter to the
not broken. Set the multimeter to the ohms range, and connect it
ohms range, and connect it
between the H1/ A1 and H1/A2 terminals. The value should be ~4
between the H1/ A1 and H1/A2 terminals. The value should be ~4
Ω.
Ω.
Normally the horn creates voltage peaks that may cause problems to other
Normally the horn creates voltage peaks that may cause problems to other electrical
electrical
devices. To prevent these voltage peaks, a diode (V8 in
devices. To prevent these voltage peaks, a diode (V8 in the circuit diagram) is installed
the circuit diagram) is installed
parallel to the horn terminals.
parallel to the horn terminals.
8.7.1
8.7.1
Diode
Diode test
test with
with a
a multimeter
multimeter
The basic diode test is
The basic diode test is very simple to perform; only two
very simple to perform; only two multimeter tests are needed to
multimeter tests are needed to
ensure that the diode works correctly:
ensure that the diode works correctly:
1.
1. Remove
Remove the
the horn.
horn.
2.
2. Set the
Set the multimeter to
multimeter to the
the ohms or
ohms or diode
diode range.
range.
3.
3. Connect th
Connect the diode’s
e diode’s cathode
cathode terminal to
terminal to the multime
the multimeter’s positive
ter’s positive terminal an
terminal and the
d the
anode to the multimeter’s negative or common terminal.
anode to the multimeter’s negative or common terminal.
4.
4. Set
Set the m
the multimeter
ultimeter to re
to read
ad ohms
ohms or d
or diode.
iode.
A low or 0 re
A low or 0 reading shou
ading should be obtain
ld be obtained.
ed.
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