Service Manual '41
Mod�ls
7800. 7850,
8800 and 9800
$.
ELECTR I CA L
SELECTOR
.A. CREDIT
MECHANISN
The credit magnet (
F
i
g.
24,
I
t
em
17)
which
o
pe
r
ate
s
t
he
r
a
tc
h
et e
s
c
a
p
e
m
e
n
t lever (Fi
g
.
24,
Item 13)
sho
u
J..d
have a re
sistance of'
1
0
.
5
ohms per coil
or 21
ohms for
two
coiJ..s;
if
this
is
not the true
res
i
st
an
ce
,
the credit
magnet
maY
be defec
t
i
v
e
.
The escapement lever
should
engage the tooth
of
the
r
a
t
c
h
e
t
wheei (Fig. 24,
I tem
9)
at least
l/32 ft.
A
d
J
u
st
m
en
t
can be
made
by
loosening
t
h
e two screws
which hold
the r
at
c
h
e
t escape
ment st�p bracket
(Fig. 24,
I
t
em
16)
a
n
d
tightening them again
with the
bracket
at the p
r
o
pe
r
p
l
a
c
e.
The
ratchet escapement
stop bracket should be bent at
s
u
c
h
an
a
ngl
e
that
it strikes
the
ratchet escapement lever
at
the
lower edge of
the lever.
This
will
help
prevent b
o
tmc!
n
g
of
t
h
e
escapement
l
ev
e
r
:end
i
n
sure
cancel.1ation or cre
dit
.
The
r
el
at
i
v
e position
of the
credit
magnet
to the escapement
1ever should be
such that when
the escapement
lever
is
aguinst
the c
r
e
d
i
t
magnet p
ol
e
f
a
c
e
,
the
rat
c
he
t
wheel tooth which
has
just escaped wilJ..
clear
the
es
ca
p
em
e
n
t lever by approxi
ma
tel
y 1/32" .
When
credit is established
on t
he ratchet wheel the
c
on
tacts of the
credit switch
(Fig. 24,
Item
24;
F
i
g
. 19,
Ite:n
M3)
should close.
The con
tacts
should
o
p
e
n
about .02on
t o
.oion
when
there
is no credit
on the ratchet wheel.
I
�
B.
S
ERI.E
S
RELAY
The relay (Fig. 24,
Item 1)
loca
t
e
d
�n
t
h
e
left side
of
the
Relay
Box
is
t
he
series reJ..ay.
•
The
series relay has two
sets
of
contacts.
The wear
al
lowance on the contacts of the
Series Felay
s
ho
u
l
d
be
.020"
to
.030".
The
a
r
c
gap of the
double-tr..row
e
o
n
t
a
c
t should
be
between
.015"
and
.025".
Both
normally
open
con�ac�s
of t
h
e
series r
e
l
a
y
should close
at
the same
time.
Adjustments
necess�rY to secure t.�e proper
cor1tact wear
a
ll
o
w
anc
e
or
to
make the contacts close a t t
he
same
time, s
ho
u
l
d
be
m
a
de by ad
j
u
s
t
i
n
g the
m
o
v
i
n
g
contact
blade
and the armature s
t
o
p
.
C .
CA.NCEL
SOLENOID
The
c
a
nc
e
l
solenoid
(
Fig
.
24,
I
t
e
m
2)
o
p
e
r
a
t
e
s
each ti�e
a
selection is made
�u
cancels
e.
cr
e
d
i
t
i"rom the
ratchet
11'heel
by
m
e
an
s
of the e
n
g
e.
g
!n
g pawl .
When
the cancel soler1oid
plunger
i
s
p
u
she
d
thr
ough its
entire stroke by
hand,
th
e
ratchet wheel should be rotated
far enough to allow the ratc�et
escapement lever to en
g
a
g
e
the
next tooth with a
clearance
of
.010°
to .020"
be
t
w
een
the es
capement lever
and
the
tooth.
The proper clee.rance
between
the
ratchet
whee1
and
t
h
e
escaoemer.t
lever
ce.n
be
adjusted by
aeans
of
the
brass
s
c
r
e
ws
on
the s
o
l
eno
i
d
bracket
24j
I
t
e
m
4) .
Содержание 7800
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