jcb JS300 Service Manual page 434

Testing a Diode or a Diode Wire
A diode wire is a diode with male connector fitted on one
end and a female connector fitted on the other end. The
diode is sealed in heatshrink sleeving.
1 To test a Diode or a Diode Wire
a On the FLUKE 85.
i Turn the switch to position 9-D.
ii Press the HOLD button and check that the H
sign appears at the top right hand side of the
display window.
iii Connect the black probe to the end of the
diode with a band or to the male connector of
the diode wire. Connect the red probe to the
other end of the diode or diode wire. If the
beeper does not sound the diode or diode wire
is faulty.
iv Connect the red probe to the end of the diode
marked with a band, or to the male connector
of the diode wire, the black probe should be
connected to the other end of the diode or
diode wire. If the beeper sounds or the meter
does not read O.L., the diode or diode wire is
faulty.
v Press the HOLD button and check that the H
sign disappears from the right hand side of the
display window.
b On the AV0 2003.
i Move the right hand slider to position 10-A,
and the left hand slider switch to position 10-C.
ii Connect the black probe to the end of the
diode marked with a band, or to the male
connector of the diode wire, the red probe
should be connected to the other end of the
diode or diode wire. If the Avometer does not
buzz the diode is faulty.
iii Connect the red probe to the end of the diode
marked with a band, or to the male connector
of the diode wire, the black probe should be
connected to the other end of the diode or
diode wire. If the Avometer does not read "1"
the diode is faulty.
C-9
c On an analogue meter.
i Select the Ohms 1000s (1k) range.
Connect the black probe to the end of the
diode marked with a band, or to the male
connector of the diode wire, the red probe
should be connected to the other end of the
diode or diode wire. The meter should read
20-400 k
is faulty.
ii Select the Ohms 100s range.
Connect the red probe to the end of the diode
marked with a band, or to the male connector
of the diode wire, the black probe should be
connected to the other end of the diode or
diode wire. The meter should read 300-400
if it reads less than this the diode is faulty.
9813/5100-1
Section C - Electrics
Overview and Schematics
Using a Multimeter
Ω
, if it reads more than this the diode
Ω
,
C-9