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Honda C50 - Speedometer; Inspecting the Selenium Rectifier

Honda C50
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5.
11
SPEEDOMETER
83
-= ,:e e
..
,
ium
recti!Jer
:-::-
·"e
l
ead
wire
from
the
r
ect
ifi
er
:-_:;._--;; in the
norma
l
direction
!C50
,
C65,
:~:
:
5.
Co
nn
ect the
EB
side
of
the tester
·ermin
als
and
the
white
lead
of
the
se
lenium
-e::-i"
er
with
test l
ead,
connect
the
e side
o=
he
teste
r
"X"
terminals
and
the
red
lead
of
the
rectifier
and
then meas
ure
the
resist-
ance
.
The
selenium
rectifier
is in
good
condition
in
the
norma
l
direction
if
it
measures less
than
15.fl
(Fig.
5-40)
c.
Measuring
in
the
reverse
direction
!C50,
C65,
550,
S65l.
Perform
the
measurement in
the
same manner as
fo
r
the
normal
direc
tion
measu
re
ment
bu
t
with
the
tester
"X"
t
er
minals
connected
in
re
verse,
the
e
conn
e
cted
to
the
white
lead
of
the selenium
rectifier
and
t
he
EB
side to
the
red
le
ad
o f
the
rectifier.
The
selenium
rectifier
is in
good
condit
ion
in
the
reverse
d
irec
ti
on
if
it measures
over
1500
f2
(Fig. 5- 41)
Fo r
C50M
,
C65M
,
connect
the
EB
side
of
the
tester
"X"
term
i
nal
s to
the
brown
a
nd
y
ellow
leads
and
the
e
side
to
the
red
lead
of
the
re
c
ti
fier
for
the
normal
directi
on,
and
for
the
reverse
direction,
connect
the
EB
s
ide
to
the
red
lead
and
e side to
the
brown
and
yel
l
ow
leads
. The selenium
rectifie
r is in
good
condition
if
the
measured resistance values
are
the
some as
above
. (Fig. 5- 42)
(4)
Check
i
ng
the
co
nditi
on
of
the
se
lenium
rectifie
r
as
described
a
bov
e,
the
low
resistance in t he
normal
dire
c
ti
on
and
a
high
resistance in the
r
everse
direction
ind
ic
ates
a
good
condi
ti
on
of
the
selenium
rectifi
er.
(Note)
The
service
te
ster
will
give
a
co
ndition
in
d
icat
i
on
of
the selenium
rectifier,
however
,
sin
ce
the
true
characteristics
will
vary
wi
th
the
app
l
ied
voltage
and
wave
f
orm,
on
electrical
test
should
be
per
-
formed
by
a specialist in a
cco
rdan
ce
with
the
specification
.
Wn
i e-
6
or
12
V
power
s
uppl
y
Figure 5- 40. Measuri
ng
in
th
e normal direction
.....
.:::
"'
E
E
:::1
(/)
"'
"'
E
Wh
i
tel
?:;.
Re
_j
+ -
Figure 5-
41.
Measuring in t
he
reverse direction
Bro
wn
Yellow
-=-
Bat
tery
Figure 5- 42. Wiring method for
C5
0
Figure
5-43.
S;oee~ome
·
e'

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