Seeburg 7800, Service Manual

Page: 36 / 87

Service
Manual '41 Models 7800,
1�, 8800 al\d 9800
B. CREDIT SwlTCf. CONTACTS
If
the credit switch con­
tacts ar-e open or- make poor- con­
tact, the
starting
relay will be
inoperative.
If
necessary, the
contacts may be cleaned with a
burnishing tool. The contact
pressure may be increased by
bending the wov!ng blade w!th
a
bending tool.
C. IN'lERLOCKING RELAY CONTACTS
The nor-mally closed contacts
of the interlocking relay
24,
Item
2 2 ;
Fig.
19,
Item
are
�
part of the series relay
circuit. Oil or dirt ol· a com­
bination of oil and dirt mey
prevent these contacts from
closing. They should be cleaned
o� oil
and
the
surface polished
with a burnishing tool.
1 6 .
CRE D I T D O E S HOT CAHCEL O H E L E C T R I C .\ l SELECTOR
A. SERIES RELAY CONTACTS
The contacts of the series
relay
(Fig.
24,
Item
1)
should
have approximately
.02011
wear
allowance. Both contacts should
close at the same time . I! the
large contacts do not close, the
cancel solenoid cannot operate.
B.
CREDIT CANCEL SOl'.,ENOID
The credit cancel solenoid
(Fig.
24,
l tem
2)
should have a
res is 1�ance of approximately
1 .
5
ohms (plus or minus
10%) .
Cr-edit
may fail to cancel if this coil
has shorted t"urtls. If the coil
is defective, it
should
be re­
placed .
C. XATCliE'!'
wEEEL ESC.�.PE7-wR!
LEVER
The r-atchet wheel escape­
r�ent lever (Fig.
24,
Item lo)
should engage the teeth of the
ratchet wheel by appt'o}:im;stely
1/3211
to
3/64".
The ratchet
escapement stop bracket (?ig.
24,
Item
16)
should strike the
ratchet escapement lever a t the
lower edge of the escapemeh�
lever. If it strikes the e s cape ­
ment lever at
any
other point,
the escapement lever- is likely to
29
bounce
a...'1Ji
fail to engage the
tooth of the ratchet wheel.
D. SOLENOID GOIDE
STOP BRACKET
The solenoid guide stop
bracket is that bracket nearesL
t.l>ie credit cancel solenoid
through �ich the connec�ing
li:nk of:
the S011!m.Oid plunger and
the engaging pawl. slilies. One
edge of this bracket serves to
stop the ratchet wheel from turn­
ing far enough
to
cancel more
than one credit. It should be so
adjusted that after- the solenoid
has sealed, the ratchet wheel may
rotate about
1/16�,
if
measured
at i t s circumference . This
bracket is adjustable after
loosenir..g the mount.il\g screw.
E.
RATCHET WP.EEL STOP
Bru.C"tCZr
Il��.RES
The
last eredit may fail to
cflncel if the engaging pin on the
credit wheel strikes the ratchet
wheel stop bl'acket. This may con­
t?·ibute a bounce: causing the
wheel to rotate backward and pre­
vent the ratchet wheel eseapement
lever from engaging the desired
�ooth on the ratchet wheel . The
stop may be bent back to re�edy
this trouble.