Service Manual '4! Models
1800, 1850, 8800
and
9800
There are two guide brackets
which support the connecting link
between the solenoid plunger and
the cancel pawl. The guide
bracket nearest the solenoid has
a stop which serves to prevent
i:otation of more than one tooth
on t..
he ratchet wheel -.•hen a
credit is cancelled. The posi
tion of this bracket is adjusta
ble after loosening the one
screw beneath the mechanism
mounting plate. It should be
adjusted so that the ratchet
wheel teeth may move about 1/1611
after the cancel solenoid plun
ger has sealed and the ratchet
escapement level' has engaged the
next tooth of the ratchet v.'heel.
D. INTERLOCi\ING Si··i!TC:H AKD IN
TERLOCKING RELAY
The interlocking switch
(F!g. 24, Item 21; Fig. 19, Item
M6)
is actuated by the cancel
solenoid (Fig. 24, Item 2; Fig.
19, I tern Ml) through the con
necting link. Cont&.ct gap
B
should not close too soon. If
it does, the cancel solenoid may
be tripped out before it has
cancelled a credit from the
ratchet wheel. If it closes at
the extreme end of the stroke,
the contact pressure may be n
suf f ic1 en t and cause erratic op
eration. The adjustment of this
switch is not crl. tical. The
contact wear allowance may be
adjusted by bending the lower
contact blade with a bending
tool.
When selections are made,
the interlockir:g relay (Fig. 24,
Item 22) will operate after the
interlockir:g switch has closed.
The relay is mounted in rub
ber grommets to prevent mechani
cal shock reaching it from the
mounting plate. The normally
closed contact should open before
or at the same time the normally
open contact closes. The normal
ly open contact should have a
wear allowance of at least l/32t1•
6.
S O L E H O I D D R U M A S S E M B L Y
A. ACCESS
TO
SOLENOID DRU:M. AS
SEJ'itBLY
Access. can be gaineu to the
Solenoid DrUJ!I Assembly (Fig. 25)
by removing the rear doors of the
Symphonola cabinet. The solenoid
drum assembly is bolted to the
Symphonola frame and may be re
moved by taking off the two
screws and one hex nut, removing
the electrical selector cable
plug (Fig. 23, Item 13) taking
out the plug connecting the motor
carry-over switch and the selec
tion cancel switch, the plug that
has two wires terminating at the
coin tripper assembly and the 5
15
conductor power cord that termin
ates at the amplifier. For most
maintenance work, it will not be
necessary to remove the solenoid
drum a ssembly from the Symphonola
chassis.
·
B .
SELECTION SOLENOIDS
\�hen selections are made,
one of the solenoid plungers
(Fig. 25, Item 12) should
up. A defective solenoid
25, Item ll) may be replaced by
taking the Solenoid Drum Assem
bly off the Symphonola Chassis
and removing the selector disc
(Fig. 25, Item
8)
and solenoid
Summary of Contents for 7800
Page 40: ...c r f 1 i l r u Z i 33 I 1 1 0 0 00 00 Cl _ 0 0 i ...
Page 44: ...CrSSI S REAR I I Ell CUTAWAY f3 I ll 37 ...
Page 47: ... I iit L 7 8 _ 1 I I I I F I G U R E HO 6 SYM HONf ...
Page 50: ...llll F l GURE H O 7 SYMPHOH II O I ...
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Page 73: ...F I G U R E H O 30 SLUG R E J E C T O R Q FRONT 72 ...