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t-a rNIo
~w
,
Ih
UU!
~.lIr1'·
8
BI-IOUI't{ 01
vohog~ A~
the
ban.TY)@..,I-_
____
,
r--:
I
---~~
,=i
f7l
.'
F.
~J;.emlti
... elv. a circuit tes.ter
mOlY
be llstd. I"
·~s
casc
o
bear in mind that
the
(+)
lenninal of
Ihe
tester
lS
ConneC[E~:D
10 rhe
t-)
side of its
buill·in b,ucry
and
the
(-)
terminal to
the
(+)
sid-e.
":"c.s,ter
Altljlr~tOI
coupler
.--"
'
-'\
I\WI
I
,
,lo.
'\
---+
..-
,...
.
1
.
-
r---:-':'"
:heckinq
diodes
with
a
circuit
tenet
:R
the
fore2oin~
check
Je~·tal$
that the reetilier
" .....
~
,·
.. "
.
...
'(HI!
.~f1nllj'
i
nn
fhpn
rllc:r:k
each
,
~
~"i'
/Jl
r
~.
:',
...
,
-
".
Check
ing diodes
for
ground
Diodes
found
short-circuited, open-circwted
or
ground-circuited by
the
foregoing methods must
be
repl.ced
.
(0)
Che cking the field coils
ror
short through
j.yers
Check
the ohmic
res.istance
of
field
cucuit by
tls)ng the
circuit
tester.
wi
th
~ts
fe-sling
prods
put ro
thO!
two slip rings.
The field
coils
are
in
MAI
NTENANCE
AND
ADJUSTMENT
;
ounoJ conoition
if
I
resistance reading
or
approx.i.",ate!y
27 o)un, I.t 20'C
(68
'
F)J
is
obtained.
A lower
reading than
this
ca!Js for
rotor
replacement.
...::.---..;~
-
I
,-
~_/
r.heckinq
field
t:o
ils fo
r
layer~short
(d)
Chocking the arm,ture wInding' for opell and
~IOun
d
windinl;ts and
Lne
core
. .
...
_p!. :
r.-cHc
uneu or
lirtJUllueu
ItJun
L_
Check
i
ng a rmatu re:
wind;
ngs
for open
and
short
(e) Each brush may be
left
in
service
until
it
wears
down to
the
lim]t line
marked
on
it.
Be sure
to
use genuine replacement
brushes.
Wear limit line
Wear
limi
t
mark on
brush
83
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