PBV20N2 PBV20N2 Service Service ManualManual
8.78.7 HornHorn
Figure 71. HornFigure 71. Horn
TypeType
AMA S.P.A hornAMA S.P.A horn
VV
ss
24 Vdc24 Vdc
Electrical wiringElectrical wiring
Quick connect terminals 6.3 x 0.8 mmQuick connect terminals 6.3 x 0.8 mm
Spare partSpare part
RL604758RL604758
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 multimetermultimeter
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 itohms range, and connect it
between the H1/ A1 and H1/A2 terminals. The value should be ~4between 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 electricalelectrical
devices. To prevent these voltage peaks, a diode (V8 in devices. To prevent these voltage peaks, a diode (V8 in the circuit diagram) is installedthe 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 multimetermultimeter
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 tomultimeter 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 thConnect the diode’s e diode’s cathode cathode terminal to terminal to the multimethe multimeter’s positive ter’s positive terminal anterminal and thed the
anode to the multimeter’s negative or common terminal.anode to the multimeter’s negative or common terminal.
4. 4. Set Set the mthe multimeter ultimeter to reto read ad ohms ohms or dor diode.iode.
A low or 0 reA low or 0 reading shouading should be obtainld be obtained.ed.
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