Seeburg LS 1 - SOLID STATE STEPPER UNIT, Type SSU4

SERVICE MANUAL
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Page I
SO LID STATE
ST
EPPER UNIT, Typc SSU4
Figure l. Solid
State
Stepper Unit, Type SSU4.
CONT ACT
PLATE
NO. I
INTRODUCTION
This stepper
unit
is used
when
aoy Seeburg
Consolette
or
Wall'O-Matic
is used
with
a
Seeburg
Coio
Opelated
Phonogtaph.
The
purpose
of the stepper
unit
is to establish
a
path
betweeo
the vrite-in
circuit
in the Solid
State Conrol
Ceoter
aod the selected
toroid
rvhen a temote
selectioo
is made.
Th.is is
accomPlished by
initiating two
groups of
ground
pulses
at the
consolette
correspooding
to
a particulat taoid.
The
grouod pulses ate
approrimately
40
milli-
seconds in
duratioo with 40
oillisecoads betweeo
pulses.
There is
apptoxioately 200 oillisecoods
betweeo the
first and secoad
gtoup
of
pulses.
The first
group
of
pulses is used to step Contact
Plate Nuober
1
which
provides the propr
oumber
circuit to the
Toroat
Memory
Unit. The second
group
of
pulse
steps, Contact
Plate Nuobet
2
vhich provides the
proper
letter citcuit
to the
Totmt
Memoty Unit
aad thea initiates
tbe write-
in pulse.
Io additioo.
the srepper unit
iocludes a citcuit to
ptovide
audio to the
phoaograph
speakers
ooly
vhen
selections are made at the
phooograph.
ADJUSTIT'ENTS
a. Ratchet
Retum
Spring
The retuto
spriog teosioo fot step switch No. 2
c,ill
be corect if the spring is
wouod
three
full
turos
wheo
the
switch
is io the rest positioo.
The
retun spting tensioo fc the step switch No.
1
will be co$ect if the spring is wouod two full
turns when tbe
s*itch is io the test
positioo.
CONTACT
PLATE
NO.2