SERVICE
I\,IANUAL
10-
22
SELECT-O-MATIC
PHONOGRAPH,
Model LS1
wlth th€ hechanlsm ln REST POSITION.
Seosing
aod Trip Relay
Circuit.
Page
17
tr,-1
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NOTE: All
cortactB
shown
Figure
10. Sioplified
use of a cootact
plunger
block on the carriaSe
as-
sembly
and the readout circuit
contacts on the
bottom of the Tcoac Memory Unit.
d. Sensing and Trip Relay Circuit
The seosing
circuit consists of a loop of
wire
threaded through the toioids
in the
Toroat
Memory
Uoit
aod tetoioated at the trip circuit in the SSC7.
Refer to Figute 10. If a toroid is in the
selected
state vhen a readout
pulse is
passed
through it, the
toroid changes state.
This chaoge is detected io
the sense loop
as a
3-volt
pulse which is fed
directly to
the trip circuit io the SCCT
(J3106).
The
3-volt
pulse
causes
sil.icon conrolled switch
SCSIl00 to
begin conducting.
This
causes the ttip
relay
to
energize
closing a
pair
of contacts that
complete
a
circuit
to the tip solenoid io the
160sT17.
e. Trip Solenoid Circuit
The trip solenoid, if eoergized
duriog a scao
cycle,
causes the oechanism
to detent and
play
a selec-
tion. Refet to
Figure 11. This circuit is completed
through the
2Ml cootacts of the clutch switch
aod
lE12 contacts of the
trip relay, The clutch switch
operates
imoediately opeoing
the 2Ml contacts and
de-energizing
the
trip
solenoid.
At the end of
play,
the 4Ml contacts of
the trip
switch
complete a
path
to the Eute-trip
relay .in the
T5A6.
Wheo the
Eute-trip
relay energizes,
a circuit
is coopleted
to
the uip
solenoid through
the
3M12
cootacts of the cam switch.
Energizing dle
trip
soleooid
causes the clutch switch to opetate
which
results in the mechaniso return.ing
to the
scan
cycle.
f, Mechanism Motor
Power Circuit
This
circuit provides 120 volts a.c.
at
60
Hertz to
the
play motor for both scao aod 45
rpo. record
play
and
95
volts
^.c.
aa 44 Hertz to the
play motor for
1)-l/3
tpa, record play.
Refer to Figure 12.
During the scao
operation aod
45 rpm. recotd play,
the line
voltage is applied
directly to the play
motor via rhe
2E2
cootacts of
the
play
coouol
assembly aod
contacts lA2 and
1A12
of the
power
relay. Yhet
a
11-l/3
rpo. tecord
is placed
on the turntable, the power relay
in the
SASI
is
energized. The circuit
between the
play
ootor aod dre lioe
voltage is then
opeoed
and
a
circuit from the
44 Hettz power converter ro rhe
play mota
is completed.
i3
ln
2?V OC
Flrol
IEI
Y
HOtt,
3rx
(61
Or ONE
HUttDPEO
srrTY l!601 Toioros sllorx
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