Wurlitzer 3020 Instruction Manual

I
I
i

SERVICE INSTRUCTIONS
AND
DARTS CATALOG
for
WALL BOX MODEL 3020
IMPULSE STEPPER MO:JEL 219
IMPULSE TRANSMITTER MODEL 215
IMPULSE RECEIVER MODEL 216
COMMERCIAL PHONOGRAPH DIVISION
~ lite RUD0 LP" WURLITZER C0 MPA NY
N 0 R T H · T 0 N. A W A N D A. N E W Y 0 R K

DEDI C-A T I 0 N
This manual is dedicated to Wurlitzer Factory-
Approved Music Merchants and their Servicemen,
through whose cooperation and continued loyalty
the unparalleled public and location owner accept-
ance
of Wurlitzer equipment has been maintained .
•
Be assured that the same high standards which
have done so much to solidify Wurlitzer's position
in the music world, will be continued as Wurlitzer
Extends Its Leadership . •
It is our sincere desire that this Manual will
materially assist you in gaining and holding loca-
tions by prompt, complete and efficient service.
The Rudolph Wurlitzer Company
North Tonawanda, N. Y.
- - ---- -- ~

. ;:-..
INTRODUCTION
The instructions contained in this Manual have
been prepared by the Wurlitzer Service Department
to assist the Serviceman in becoming familiar with
the Models 3020 Wallbox, 219 I~pulse Stepper,
215 Impulse Transmitter and 216 Impulse Receiver.
They are presented for your convenience and ref-
erence in the firm belief that a better understanding
of the working principles and required maintenance
of the wallbox will result in increased operating
profits and more satisfactory performance of your
equipment.
All details of the broad subject of service cannot
possibly be covered in this Manual. The Wurlitzer
Service Department will be glad to assist you with
any special problems, through Field Representatives,
Distributors or the . Wurlitzer Factory.
If you will submit problems, advice and suggested
remedies, you will enable us to improve our service
to you through our periodic "Service Slants" bul-
letins and through the medium of this Manual.
Remember, your ideas,will help others ... and their
ideas will help you.
Your comments to:
Milton A. Bartels
General Service Manager
The Rudolph Wurlitzer Company
North Tonawanda, N.Y.

Service lnstrudions
CONTENTS
SECTION
I General Description . . ..
Cycle of Operation for Wireless Wallbox
Introductory . . . . . • . • • .
Cycle
of Coin Registration . . . . .
Cycle
of Selection . . . . . . . . . .
Operation of Model 215 Impulse Transmitter
Operation of Model 216 Impulse Receiver. •
Operation of Model 219 Impulse Stepper .
Introductory . . . • • . . . . . •
Cycle
of Operation . . . . . . . .
Cycle
of Operation for T~ree Wire Wallbox
Introductory . . . . . .
Cycle
of Coin Registration .
Cycle
of Selection . .
Coin Selector Mechanism
II Installation
Three Wire Installation.
Two Wire Installation •.
Wireless Installation . • • •
Tuning of Model 216 Impulse Receivers . . • . . .
Changing Frequency of Model 215 Impulse Transmitter ·
Use of Bridging Condenser No. 39851 ·
III Adjustments. .. • • •
IV
Model 3020 Wallbox •
Coin Selector Mechanism ' Adjustment.
Coin Gate Adjustment
Coin Switch Adjustment
Selector Switch Locking Bar 'Adjustment
Accumulator Adjustment
Selector Button Relay Adjustment
Coin Relay Adjustment • •
Model 219 Impulse Stepper
Stepper Contactor Arm Adjustment
Stepper Operating Arm Adjustment
Stepper Switch Adjustment . ,
Release Latch Relay Adjustment •
Maintenance
Lubrication
Wall box
Impulse Stepper
Cleaning . , •
•
PAGE
1
1
1
1
1
3
3
7
7
7
8
8
8
10
12
13
q
13
13
13
14
14
15
15
15
16
16
17
17
17
17
18
18
18
19
19
20
20
20
20
20

Service Instructions
LIST OF ILLUSTRATIONS
FIGURE
TITLE
PAGE
1 Five
Cent Coin Registration Schematic 1
2
Ten Cent Coin Registration Schematic 2
3 Twenty-Five
Cent Coin Registration Schematic . 2
4
Functional Schematic Model 3020 Wallbox, With Model 215 Transmitter . 4
5
Model 3020 Wallbox Schematic . . . . . . . 5
6
Model 219 Impulse Stepper and Model 2i6 Impulse Receiver Schematic 6
7
Wallbox Tuning . Switch in "TUNE" Position. . . · . 7
8
Receiver No. 1 Transformer Switch in "N" Position 7
9 Five
Cent Coin Registration Schematic 9
10
Ten Cent Coin Registration Schematic . . 9
11 Twenty-Five
Cent Coin Registration Schematic 1o
12
Model 219 Impulse Stepper Schematic 11
13
Coin Selector Mechanism . 12
14
Setting Frequency Switch . 14
/''" ""'""' '
15
16
Installation of Wireless System on Power lines Separated by Individual Watt-Hour Meters 14
Installation of Wireless System on Power lines Using Three Wires 14
17
Coin Selector Mechanism Adjustment 15
18
Coin Gate Adjustment 16
19
Coin Switch Adjustment 16
20
Selector Switch locking Bar Adjustment 1 7
21
Accumulator Adjustment 17
22 Coin Relay 17
23
Stepper Contactor Arm Adjustment . 18
24
Stepper Operating Arm Adjustment 18
25
Stepper Switch Adjustment · 19
26
Release latch Relay Adjustment 19
27
Model 219 Impulse Stepper lubrication .20
28
Model 3020 Wallbox lubrication . 21

Service Instructions
SPECIFICA liONS
MODEL 3020
Streamlined, Highly
Polished, all metal
... Picks up and re-
flects surrounding
lights , giving added
Eye-appeal ... Quick-
ly converted from
Three Wire to Wire-
less by merely plug-
ging in a Model 215
Transmitter and a
Line
Cord.
13-i / 4" High-S-3 / 4" Deep-9" Wide-Packed 28·1/ 2 lbs.
Single drop slot for 5, 10 and 25¢ coins to standard
ty pe slug rejector assembly. Credits banked on ac-
cumulator in wall box through positive motor-driven
coin register.
Three Wire System requires no connection to power
line .·May be converted to wireless or two wire system.
IMPULSE STEPPER
MODEL 219
7 -1 /2" High- 7- 1/ 4" Deep- 9-1/2"
Wide-Packed 20 lbs.
Selenium Rectifier used
in place of tubes
assures
long trouble free life and oper·
ating stability.
Single cable
and multi-wire connector
carries circuits to ]unction Box.
Fuses
and terminal strip for Wallbox
line accessi ble at front door of phono-
graph.
115 volt, 60 cycle A. C.
IMPULSE TRANSMinER
MODEL 215
2- 3/ 4" High-2-1 /4" Deep-7" Wide
-Packed 1·1 / 2 lbs.
A plug-in unit ; no adjustment required
as frequency is fixed through use of
crystal · controlled circuit. Various fre·
quencies available to fulfill local
re·
quirements. .
A
6V6GT and 6X5GT tube used. One
Transmitter required for each Wireless
Wallbox . May be ordered separately.
IMPULSE RECEIVER
MODEL 216
6" High-5-1 / 4" Deep-6-1 / 2" Wide
-Packed 4-1/ 2 lbs.
A6SK7,6SQ7,6SN7GT and 5Y3GT / G
tube used in each receiver . A 6U5 / 6G5
tube installed for tuning, may be moved
from one unit to another .
All circuit connections
made by plugging
the Impulse Receiver i nto the Impulse
Stepper.

Service Instructions
Section I
General Description
SER VI C E~
I-NSTRUCTIONS
SECTION I
GENERAL
DESCRIPTION
CYCLE OF OPERATION FOR WIRELESS WALLBOX
INTRODUCTORY
The Wurlitzer Wireless Remote Control System
provides for transmission of pulses over 60 cycle wir·
ing circuits from wallboxes to the phonograph.
The source of the signals is a transmitter in the
wallbox which sends out radio frequency pulses. The
device which responds to these signals or pulses is
the radio impulse receiver, located in the phonograph.
The receiver actuates the stepper, which in turn sets
up the circuit required for obtaining the desired se-
lection on the phonograph.
Generally, external wiring is not required with the
Wireless Remote Control
System; wallbo:ices are sim-
ply plugged into the elec·
the coin relay closes the motor is started through con-
tacts 3
and 4, the register circuit is completed .through
contacts 7 and 8 and the selector circuit is isolated
through contacts 5 and 6. When the coin relay is
energized, contacts 5 and 6 break the selection ci~cuit
while the coins are being registered. ·
The coins are held on the coin switch by the coin
gate, as the coin disc contact rotates in a clockwise
direction from the at rest position . The coin swi tch ,
which is still closed, is disconnected from the coin
relay circuit ( Segment A of coin disc) and connected
into the accumulator coil circuit ( Segment B of coin
tric wiring outlets and the
receiver is plugged into
the stepper in the phono·
graph.
TO SELECTOR SWITCHES
CYCLE OF COIN
REGISTRATION
The coin disc contact
arm in its ~ rest position,
sets up a circuit for the 54
or 10¢ or 254 coin switch
and the coin relay. When a
coin is inserted it passes
through the slug rejector
and falls against the " coin
switch. The coin switch
closes, rhus closing the coin
relay. (See Figures 1, 2 and
3.) This relay interlocks
through contacts 1 and 2
until near the end of the
revolution when the release
switch opens it. When
5¢
COIN SWITCH
COIN
RELAY
TO SEL PLATE
TO
117 v.
TO MOTOR
TO
24 " ·
Figure l-Five Cent Coin Registration Schematic
•
1

Section I
General Desc;ription Service Instructions
TO SELECTOR SWITCHES
10¢ COIN SWITCH
COIN
RELAY
COIL
TO SEL. PLATE
TO SEL. BUTTON RELAY
ACCUM. SWITCH
TO
117 v.
TO MOTOR
TO
2.4 v.
I
disc). If a quarter is insert·
ed, six
24 volt A.C. pulses
are sent to the accumulator
coil
moving the ratchet
wheel six teeth. (See Figure
3.)
If a dime is inserted,
three 24 volt A.C. pulses
are
sent moving the ratchet
wheel three teeth. (See Fig·
ure 2.)
If a nickel is in-
serted, two 24 volt A.C.
pulses are
sent moving the
ratchet wheel two teeth.
(See
Figure 1.) After the
money is registered, the
coin gate opens through
the action of a cam con•
trolled by
the motor . This
allows· the coin to drop in-
to the cash box, thereby
opening the coin switch.
Further action of the cam
is immediately in effect to
actuate
the cancel lever,
canceling
the ratchetwheel
one tooth. This leaves five
registrations if a
quarter
has been inserted, two
registrations if a
dime has Figure
2-Ten Cent Coin Registration Schematic
2
TO SEL . BUTTON RELAY
TO SELECTOR
SWITCH£~
ACCUM. SWITCH
8
A /;: :•\
\\
\
I I
'- ----- __ _;
CONTACT
PLATE
·COIN
REGISTER
2 5¢ COIN SWITCH
COIN
RELAY
COIL
INTERLOCK
~-o-'l~:KI
MOTOR __ ~w-7-~~~-·T_O __ M __ O•T~OR
ISOL. REG.~~i--~..J
SEL . REG.
TO SEL. PLATE
TO
117 V.
TO
24 v.
Figure 3-Twenty-Five Cent Coin Regipration Schematic
I
••
been inserted, or one regis-
tration if a nickel has been
inserted. Near the end of
the cycle the release switch
rotates to its. open segment,
releasing
the coin relay.
The full q.cle switch keeps
the -' moio ~
1
running until
the open segment is reach-
ed, thus
stopping the mo-
tor.
When th:e motoc stops,
the contact arm is Ill rest
on contacts H and F of the
contact disc. (See Figure 4.)
After a nickel; dime or
quarter has been registered
on the ratchet wheel, the
accumulator switch is clos-
ed.
·The contact arm, at
rest on disc contacts H and
F, completes the circuit
through the .accumulator
switch to energize the se-
lection
button relay coiL
This relay remains ener-
gized until released by the
release switch, at the time
it · reaches the open seg-
ment.
The wallbox is now
ready for a selection.

Service Instructions Section I
CYCLE OF SELECTION
After a coin has been inserted and registered, the
wallbox is ready for a selection. When any one of the
24 selector buttons is depressed, the following cy cle
takes place:
The coin relay remains open, keeping the selector
circuit closed through its normally closed contacts 5
and 6. (See Figures 4,
5, and 6. ) The motor is started
by the 117 volt contacts on any one of the selector but·
ton switches which are in series with contacts 3 and 4
of
the selector button relay and in parallel with t he
full cycle switch. The selector buttons are latched
mechanically through cam action, powered by the rno·
tor.
The selector contact arm rotates to complete the
cathode circuit of the transmitter through contacts I
and G. This generates. a long R.F. pulse or signal
which is transmitted over. the 117 volt power lines to
the phonograph . This pulse, or signal, comes out of
the j unction box through terminals 32 and 33, of the
.B connector stepper socket, into the stepper and out •
through the 12 prong socket terminals 6 and 12 to
the receiver
12 prong plug terminals 6 and 1~, which
are the receiver R.F. Input terminals. The signal is
~hen amplified and passes through the receiver, there·
by actuati
ng the receiver relay. The contacts of the re·
ceiver relay
complete the circuit to terminals 5 and
8 of the 12 prong receiver plug and through terminals
5 and 8 of
the 12 prong stepper socket, the circuit
is completed to energize . the stepper coil. This first
long R.F. pulse closes
the stepper coil thereby advanc-
ing the stepper contact arm one step . It also corn·
pletes
the circuit through its contacts l and 2 ~o the
coil of the timing relay which closes. The clos1ng of
the timing relay and its conta~ts l and 2 completes a
ci
rcuit to close the release latch relay. Additional
R.F. pulses picked up by the receiver advance the
stepper contact arm to the desired point o( selection.
As the motor completes its cycle, cam action cancels
one registration
on the ratchet wheel and also releases
the selector button latch bar permitting the selected
button to return to a normal position through spring
loading.
OPERATION OF MODEL 215
IMPULSE
TRANSMinER
The Model 215 Impulse Transmitter consists of a
6V6GT /G oscillator rube, a 6XSGT /G rectifier tube
a nd other associated components. (See Figure 4.) The
oscillator frequency is controlled by a quartz crystal
in the
6V6GT/G grid circuit. The 6Y6GT/G plate
circuit is runed to the crystal frequency at the factory.
This tuning, generally, should not be molested in the
field. The oscillator is keyed in the cathode circuit
by means of the rotating contact arm as it rides over
the contact scrips.
The secondary or output coil, coupled to the oscil-
lator coil connects to the A.C. line when a selection
General Description
is being made, through the .1 MFD C-8 condenser and
the frequency change switch. The C-8 condenser pre-
vents 60 cycle current from affecting the output coil
but does not i mpede the radio frequency signal being
transrnitted.
Transm itters are shipped from the factory equipped
with a red crystal unit and with che three-posicion
switch
turned to " RED ". Blue and yellow crystals are
available from the Service Department, but should be
used
only when it becomes necessary to change fre-
quency
on one of two locations close together to avoid
interference.
The three crystal units (red, blue and
y ellow ) provide three operating frequencies. When
blue or yellow crystals are used, the transmitter switch
must be turned to the corresponding color position.
The transmitters are carefully peaked or tuned,
working into a proper load at the factory. In general,
it is advisable not to attempt to improve on the fac-
tory adjustment on location, because it is possible to
upset
the peaking enough co prevent the cr ystal fr om
oscillating during normal wallbox key ing . Repeaking
of the transmitter can best be done in the Distributor 's
or Operator 's Service Department, which is ~quipped
with suitable test apparatus.
OPERATION OF MODEL 216
IMPULSE
RECEIVER
The Model 216 Impulse Receiver installed in the
phonograph, gets its filament and "B" power from the
stepper into which its plugs. The tube complement
includes a 6SK7 amplifier, a 6SQ7 detector and D. C.
amplifier, a 5Y3GT rectifier and a 6SN7 GT for oper-
ating the relay. An additional cube, a 6U5/6G5, is
used for tuning the receiver. This may be purchased
from
your Distributor.
Signals from the wallboxes are amplified by the
6SK7 tube and are then rectified by the diodes 'of the
6SQ7 tube . (See Figure 6 ). Each diode of the 6SQ7
rube
is connected to a separate secondary winding of
the second R.F. transformer. One diqde c- ircuit sup-
plies a
lengthened pulse of negative potential for the
6SK7 grid, which makes the receiver less sensitive to
extraneous noise between pulses. The other diode cir-
cuit supplies a signal pulse, also of negative polarity .
co the 6SQ7· grid, causing the triode section to become
non-conducting. With no signal, the triode section
conducts, causing the 6SQ7 plate and 6SN7 grids to
become more negative than the 6SN7 cathode, so that
the 6SN7 draws no plate current.
The triode section of the 6SQ7 and the paralleled
sections
of the 6SN7 form a direct coupled D.C. am-
plifier.
With no signal coming in, the 6SQ7 triode
conducts and the 6SN7 is cut-off. When signals are
received, each pulse causes a negative voltage
co ap-
pear on the 6SQ7 grid and drives it to cut-off, i.e., it
does not· draw plate current. The potential of the
6SQ7 plate and. 6SN7 grids immediately rises to chat
of the 6SN7 cathodes and the 6SN7 conducts, thereby
3

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Section I
Generol Description
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Service Instructions
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Figure 6-Model 219 Impulse· Stepper and
Model 216 Impulse Receiver Schematic
Section I
General Description
~
::~e

Service lnstrudions
Section I
Figure
7-Wallbox Tuning Switch in "TUNE" Position
closing
the relay in the receiver and cawing the ·step-
per to operate, as described in Operation of Model'
219
Impulse Stepper.
The impulse receivers are tuned at the factory for
the red frequency. In case retuning is necessary when
a receiver is installed on location, it may be done by
inserting a 6U5/6G5 tuning eye tube and getting a
steady signal
from any wallbox. To obtain a steady
signal,
open the wallbox door and throw the switch
to the "TUNE" position. (See Figure 7.) The sensi-
tivity
control should be turned clockwise to begin
tuning and backed-off counter-clockwise as the receiver
is
brought more i'nto tune. The tuning procedure is
to
adjwt the four trimmers on the R.F. transformers
to
obtain closing of the tuning eye. Flip the receiver
No. 1 transformer switch to the "N" position. (See
Figure 8.) As the eye closes, turn the sensitivity con·
trol counter-clockwise to open the eye and to allow
more peaking with the trimmers. Continue backing-
off on the sensitivity control setting and tuning with
the trimmers until the best peaking is obtained. Then
throw the receiver No. 1 transformer sy.-itch back to
rhe "B" positioq.
NOTE
It is imfJortantto remember that merely getting the
tuning eye to close does not mean that the receit•er is
tuned.
The receiver can be considered tuned only
when the eye is ofJen very slightly and further adjust·
ment of the four trimmers will not cause it to close
farther.
In general, it is desirable to keep the sensitivity con-
trol as far counter-clockwise as possible while still
getting operation from all wallboxes with all the
lights and other ·loads of the location turned on. This
will allow the receiver to be . less sensitive to extran-
General Description
eous noises
on the A.C. line and will also minimize
interfering signals from nearby locations. The sensi-
tivity
control should be turned counter-clockwise until
some one wallbox just fails to operate the receiver;
the control should then be turned clockwise about 10
divisions from the setting at which the first failure
occurred. For example, assume
that at 30 divisions a
wallbox failure was noted; 30 plus 10 equals 40 divi-
sions,
at which setting we may expect to get operation
and also less noise than if we were to put the control
at 85 or 100 divisions. Sometimes it may be possible
to set
the sensitivity control full counter-clockwise and
obtain satisfactory performance. This setting will give
least interference from other locations and may fre-
quently permit operation where higher settings would
require a shift of frequency. Also, a low setting of the
sensitivity control greatly reduces the effect of extran•
eous transients.
OPERATION OF MODEL 219
IMPULSE
STEPPER
INTRODUCTORY
The Model 219 Impulse Stepper is designed to
operate by itself on three · wire operation. By adding
a Model 216 Impulse Receiver it is used on wireless
operation. · Its purpose is to pick up impulses either
by direct wire or through radio frequency over the 11;
volt power · line, depending on - the type of remote con-
trol selectors used. Each impulse received by the
stepper is mechanically registered by the stepper arm,
the number of impulses received determining the
selection.
CYCLE OF OPERATION
The impulse stepper will not operate unless first
Figure
8-Receiver No. J Transformer Switch- in "N"
Position
7

Section Service Instructions
General Description
set
up to receive selection pulses. Using a three wire
operation, the long A.C. pulse closes the A.C. pulse
relay. This action closes contacts 4 and 5 of the pulse
relay and opens contacts 5 and
6. (See Figures 6 or
12 .) Contacts 4 and 5 complete the circuit to energize
the stepper coil. Contacts 5 and 6, being open when
the relay is energized, isolates the D.C. selenium
rectifier
power supply from the A.C. pulse received.
These two currents superimposed may cause damage
to
the rectifier. The purpose of contacts 1 and 2 of
the pulse relay is to keep the coil energized for the
full duration of the A.C. pulse, as the actuation of
the release latch relay opens its contacts 3 and 4 to dis-
connect the A.C. pulse relay. The stepper is now set
up to allow a three wire remote selector to operate
the stepper coil from the D.C. power supply. The se-
lector now becomes a D.C. interrupter switch.
In using a wireless remote selector, the long R.F.
pulse is picked
up by the impulse receiver, amplified
by
the 6SK7 R.F. amplifier and then rectified by a
diode of
the 6SQ7 which supplies a signal of negative
polarity to the grid of the 6SQ7 triode section. This
causes the 6SQ7 to stop drawing current, causing the
potential of the 6SN7 grids to rise. The C-11 con-
denser, across
the 6SN7 grids and cathodes, acts as a
protector against extraneous noises because the
charging of this condenser slows the potenfial rise on
the grids of the 6SN7. When this condenser receives
its full charge,
the potential has risen to such a point
that the plates of the 6SN7 will draw sufficient current
to energize the radio pulsing relay. The contacts of
the radio pulsing relay, when closed, energize the
stepper coil. The protective C-ll condenser of the
impulse receiver is isolated from the grid circuit of
the 6SN7 by the normally closed contacts 8 and 9 of
the timing relay and becomes fully discharged through
contaCts 7 and 8 of the timing relay. The stepper is
now receptive to short R.F. pulses delivered from a
wireless remote
control selector.
As
previ _ously pointed out, the A.C. pulse relay, in
closing, energizes the stepper coil by three wire
operation and the radio pulsing relay, in closing; ener-
gizes
the stepper coil by "Wireless operation", thus
holding the stepper coil closed for the duration of the
long pul$e. The balance of the cycle of operation is
identical for three wire or wireless as follows:
Contacts 1
and 2 actuated by the stepper arm com-
plete the circuit to energize the timing relay coil.
When the timing relay closes, it closes its contacts 1
and 2 and 5 and 6 and opens its contacts 3 and 4
whi~h isolate the selector magnet registering circuits.
Its contacts 1
a~d 2 complete the circuit to energize
the release latch relay. Its contacts 3 and 4 (normally
closed) complete the registering circuit through con-
tacts 1 and 2 of the release latch relay, to a selector
magnet in the phonograph when the timing relay is
released. Contacts 5 and 6 of the timing relay com-
plete
the D.C. circuit through normally closed con·
tacts 5 and 6
of the pulse relay, to energize the stepper
coil. This circuit being interrupted by the selector
contact switch
in the wallbox. The number of im-
pulses received by
the stepper is determined by the
selected number at the wallbox: The timing relay
and
the release latch relay are equipped with copper
slugs. These slugs have a definite action on the relays.
They are large shorted turns on the poles of the mag-
nets of
the relays. When the relay coils are energized,
the slugs store
up energy. This energy is discharged-
slowly
which delays the releasing of the armature
from the pole piece. The timing relay and the release
latch relay have
approximately the same slugs. They
are provided to hold the relays closed between pulses.
The timing relay is energized by pulses delivered
through contacts 1 and 2 of the stepper coil· while the
release latch relay is energized constantly through
contacts 1 and 2 of _ the timing relay as long as the
timing relay is closed. After pulses cease, the dissipa-
tion of energy in the slugs of the timing relay takes
place.
This means the timing relay opens first, clos-
ing its contacts 3 and 4 which through contacts 1 and
2
of the release latch relay give a positive impulse to
a selector magnet in the phonograph and completes
the circuit registering a play on the electric counter.
At this time, the slugs in the release latch relay have
dissipated
their energy allowing the relay to open to
release the stepper contaCt arm pawl and at the same
time, opens its contacts 1
and 2 to break the common
circuit to' the selector magnet in the phonograph. The
stepper arm is then restored to a rest or starting posi-
tion through spring loading.
CYCLE OF OPERATION FOR THREE WIRE WALLBOX
INTRODUCTORY
The Wurlitzer Three Wire Remote Control System
provides for transmission
of pulses through a three
wire cable connected directly to the Model 219 Im-
pulse
Stepper in the phonograph. The cable also
conducts
power to the wallbox; no other wiring is
required.
The power for the first long pulse is obtained from
the wallbox- transformer 24 volt secondary winding
and the stepper transformer 24 volt phase winding. _
8
Additional pulses are obtained through D.C. power
delivered from the seleni~ rectifier in the stepper.
The pulses actuate the impulse stepper directly, step-
ping the stepper arm to the desired selection.
CYCLE OF COIN REGISTRATION
The coin disc contact arm in its 111 ~:est position, sets
up a circuit for the 5f or lOf or 25f coin switch and
the coin relay. When a coin is inserted it passes
through the slug rejector and falls against the coin
switch. The coin switch closes, thus closing the coin

relay. (See Figures 9, 10 and
11.) This relay interlocks
through contacts 1 and 2
until near the end of the
revolution when the re-
lease switch opens it. When
the coin relay closes the
motor is started through
contacts 3 and 4, the regis-
ter circuit is completed
through contacts 7 and 8
and
the selector circuit is
isolated through contacts 5
and
6. When the coin relay
is energized, contacts 5 arid
6
break the selection cir-
cuit while the coins are be-
ing registered.
Service
lnstrudlons
TO SELECTOR SWITCHES
5 ¢ COIN SWITCH
COIN
RELAY
COIL
TO SEL . PLATE
Sedion I
General Description
TO SEL BUTTON RELAY
ACCUM. SWITCH
TO
117 v.
TO MOTOR
TO
24V .
7
• •
The coins are held on
the coin switch by the coin
gate , as the coin disc con-
tact rotates in a clockwise
direction from the at rest
position. The coin switch,
which is still closed, is dis-
connected
from the coin
relay circuit (Segment A of
coin disc) and connected
into the accumulator coil Figure
9-Five Cent Coin Registration Schematic
TO SELECTOR SWITCHES
D
10¢ COIN SWITCH
COIN
RELAY
COIL
TO SEL . PLATE
TO.SEL. BUTTON RELAY
ACCUM. SWITCH
TO
117 v.
ACCUM . COIL
TO MOTOR
TO
24 v.
I
Figure JO-Ten Cent Coin Registration Schematic
circuit ( Segment B of coin
disc.)
If a quarter is insert -
ed, six 24
volt A.C. pulses
are sent to the accumulator
coil moving the ratchet
wheel six teeth. (See Figure
11.) If a dime is inserted,
three 24 volt A.C. pulses
are
sent moving the ratchet
wheel three teeth. (See Fig-
ure 10.) If a nickel is in-
serted, two 24
volt A.C.
pulses are
sent moving the
ratchet wheel two teeth.
(See
Figure 9.) After the
money is registered, the
coin gate opens through
the action of a cam con-
trolled by
the motor. This
allows the coin to drop in-
to
the cash box, thereby
opening the coin switch.
Further action of the cam
actuates
the cancel lever,
canceling
the ratchet wheel
one tooth . This leaves five
registrations if a
quarter
has been inserted, two reg-
istrations if a
dime has been
9

Section I Service Instructions
General Description
TO SEL . BUTTON RELAY
inserted, or one registra-
tion if a nickel has been in-
serted.
Near che end of the
cycle, che release switch
rotates co its open segment,
releasing
the coin relay.
The full cycle switch keeps
the mocor
running until
the open segment is reach-
ed, thus
stopping the motor.
When the motor stops, the
contact arm is at rest on
contacts H and F of the
contact disc.
TO SELECTOR SWITCHES ACCUM. SWITCH I
B
A ~~ : :o \
\\ \
I I
\. _ __ _ __ _ __ ;
CONTACT
'
PLATE:
COIN
REGISTER
r
,..
25¢ COIN SWITCH
COIN
RELAY
• ISOL . REG. r-~~
SEL . ~EG .
TO SEL . PLATE
TO
117 V.
• •
ACCUM. COIL
TO MOTOR
After a nickel, dime or
quarter has been register-
ed
on the ratchet wheel,
the accumulator switch is
closed.
The contact arm,
at rest on disc contactS H
and F, completes the cir-
cuit through the accumula-
tor switch co energize rhe
selection
button relay coil.
This relay remains ener-
gized
until released by the
release switch, at the time
it . reaches the open seg-
ment.
The wallbox is now
ready for a selection to be
made. Figure J
J-Twenty-Five Cent Coin Registration Schematic
* * * *
CYCLE OF SELECTION
After a coin has been inserted and registered, the
wallbox is ready for a selection. When any one of the
24 selector buttons is depressed, the following cycle
cakes
place .
The coin relay remains open, keeping the selector
circuit closed through normally closed· contacts 5 and
6. (See Figure 5. ) The motor is started by the 117
volt contacts
on any one of the selector switches
which are in series with contacts 3 and 4 of the se-
lector
button relay and in · parallel with the full cycle
switch.
The selector buttons are latched mechani-
cally
through cam action powered by the motor. The
selector contact . arm rotates co complete the long pulse
circuit through contacts I and G on the selection
place
and throug.l\ the 24 volt secondary of the wall-
box
transformer. This long pulse closes the pulse re-
lay
in the impulse stepper . (See Figure 12.) This ac-
tion closes contacts 4 and 5 of the pulse relay, com-
pleting the circuit to actuate the stepper coil which
is powered by D.C. from the selenium rectifier in the
stepper. This ·advances the stepper arm one position
The action of. che stepper ratchet closes the · stepper
switch contacts 1 and 2 completing the D.C. circuit
co actuate the timing relay. This action closes contacts
10
1 and 2 of the-timing relay which completes che D.C.
circuit co energize che release-latch relay. .
After the wallbox selector. contact arm has deliv-
ered
the long A.C. pulse and the stepper relays are
energized, the selector contact arm begins its action as
an
impulse switch co actuate the stepper coil. Cur-
rent is now being supplied over wires 1 and 2 of the
three wire cable co the wallbox from the selenium
rectifier in the stepper. For each impulse made by the
selector contact arm, che stepper arm is advanced one
posicion. When che selector arm in the wallbox
reaches the desired selection, che remaining contacts,
if any,
on the selector plate are open and no further
impulses can be made. The stepper arm stops and is
held
on the desired contact of the stepper switch by
che release latch relay. Since no more impulses can
be delivered beyond the desired selection point, the
timing relay·'is de-energized and opens. While the
timing relay is open and the release ' latch relay is
closed, a
circuit is completed to the desired selection
magnet through contacts 3 and 4 on timing relay and
contacts 1 and 2 of release latch relay. The release
latch relay chen releases
and permits the stepper arm
to return to the at rest posicion by spring loading .

)
RELEASE LATCH RELAY
CDNTACT TERMINALS
0
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C l TRANSFORMER
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SCHEMATIC WIRING DIAGRAM tv'ODEL 219 IMRJLSE STEPPER
. .
TIMI"'G RELAY CONTACT TtRMINALS
STEPPER CDNTACT ARM
"'
1\
::1"
II
STEPPER CDNTACT ARM
12 WI RE .or-ES RE C TO RADo0 Rfl.(III(R
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Sedion I Service lnstrudions
General Description
COIN SELECTOR MECHANISM
The S, 10 and 25 cent coin selector is built into a
single
unit, all coins having a common entrance. The
coin immediately encounters a weighing device which
rejects light slugs and dete~mines the path for 5, 10
and 25 cent coins to pass through the mechanism.
(See Figure 13.) A wire stop takes out any stugs hav-
ing a hole in the center, such as washers. The sizing
10c SIZE SLUG GAUGE
gauge eliminates thick slugs. Steel slugs are ejected
by
the action of a wiping blade moved by the linkage
from the reject button at the coin entrance. The coins
are
guided through, against or past gauges as deter.
mined by their speed and are controlled bv the actioo
of the magnetic field on them.
SCAVENGER WIPER BLADE
WASHER STOP
Figure J 3-Coin Selector Mechanism
12