r
0
Service
Manual
'41
Models 7800, 7860, 8800 and 9800
has been played and the turntable
has returned to its lowest posi
tion. The solenoid plunger and
selector pin are pushed down be
fore the record has moved to the
playing position, but the wotor
carry-over switch (Fig. 25, Item
17; Fig. 27, Item F-12) located
on the rear of the Symphonola
Chassis, keeps the wotor control
relay energized until the record
has been played.
D.
COUNTER UNIT
The Solenoid Druw type
SD20-7Z is equipped with an elec
trically operated counter that
operates every time a selection
is niade frow either the electrical
selector or from a remote control
box. If one number is selected
twice, the counter will register
two selections. It operates
every time a selecting pulse
travels through any of the selec
tor solenoids.
The counter u.nit is located
inside the Solenoid Drum sub
panel, and only the nuwerals are
visable through the window in the
side of the sub panel. To pre
vent tampering with the counter
unit, the sub panel bottow plate
is sealed with a small lead and
wire seal, making it impossible
to open the Solenoid Druw sub
panel without breaking the seal.
Fig.
No.
25 is a photograph
of the Solenoid Druw SD20-7Z
showing its assembly and miscel
laneous parts and Fig. No. 27 is
a Schewatic Wiring diagram show
ing its electrical circuits.
Summary of Contents for 7800
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