Oak Mfg. Co. 6666 Schematic

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Product Information:
Model:6666
Manufacturer:Oak Mfg. Co.

Schematics Content:

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Page 1:

MILWAUKEE STAMPING CO.

RCD.CH. PA E 15-2 MILWAUKEE
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(C)J?hn F. Rider

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(C)John F. Rider

Page 3:

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Rider

Page 5:

RCD.CH. OAK PAQE 15-`

OAK MFG. CO.

TOP VIEW, COMPLETE CHANGER. TURNTABLE REMOVED*

This changer automatically plays ten 12" records
or twelve 10" records. Service information contained
in this bulletin covers the operation, care, and ad-
justments that may be necessary if the mechanism
fails to operate properly.

OPERATION

The motor shaft presses against its idler wheel
which turns the turnable (7103 or 7107) from the
inside rim. The turntable rests on a pin through the
turntable shaft 6655 and causes the turntable shaft
to turn. The pinion 4246 at the base of the turntable
shaft turns in a notch in the drive cam 4207 while
records are playing. When the pickup arm 4283
reaches the inside groove of a record the bracket
6697 on the pickup crank 6694 presses against the
trip screw 7555 which is mounted in the pawl latch

assembly 7809. The opposite end of the pawl latch
assembly releases the starting pawl 6643 allowing
the starting pawl to engage the pinion. This starts
the drive cam 4207 and the change mechanism.

As the cam begins to turn, the lift pin 6876 is
forced upward by the raised portion of the cam.
This lifts the tone arm off the record. The cam
follower 6695 then rides its groove on the cam and
swings the tone arm outward. During this outward
swing the indexing pin 6862 slides of! the index
stop 6856 and is pushed upward by the indexing pin
spring 4272. While lthe tone arm is all the way out;
the starting pawl 6643 is cocked into position by the
bracket 6697 on the pickup crank 6694.

The cam follower swings the tone arm in until
the index pin 6862 contacts the index pin stop thus
getting the proper needle drop position.

(C)J'ohn F. Rider

Page 6:

MODEL 6666

OAK MFG. CO.

BOTTOM VIEW. LESS MAIN GEAR ASSEMBLY.

While the cam is turning the eccentric 6645 turns
the changer blades thru the action of the eccentric
arm 7144 and the tie bar 7562 Which connects the
changer shafts 4229 and 4232 together.

When the cam again comes to rest it is held in
position by the cam stop lever 6659 and cam stop
roller 6660.

MANUAL OPERATION

In manual operation the manual link 6668 holds
the starting pawl 6643 in the cocked position at all

REJECT

The reject link 6667 releases the pawl latch as-
sembly 7809 allowing the starting pawl 6643 to enA
gage the pinion 4246 and start the change cycle.

ADJUSTMENTS

These adjustments are made correctly at the fac-
tory and ordinarily need never be altered. Should it
become necessary to readjust, due to accident or
tampering, proceed as follows:

A, Adiusi'inq The Needle Landing Position

The needle drop adjusting screw 6715 is readily
accessible from the top of the changer, To adjust,
loosen the nut and turn the screw with a screw-
driver. Maximum adjustment is obtained from one
complete turn of the screw-any more than one
turn merely repeats itself. At the factory the needle
drop is adjusted to 4% inches from center for a ten
inch record and 5% inches from center for a twelve
inch record, Both landing positions are governed by

(C)John F. Rider

Page 7:

RCECH. OAK PA 15-

OAK MFG. CO.

IOTTOM VIEW. ONE

the the same screw so adjusting for one or the
other should be sufficient. When completed, tighten
locking nut.

If the landing position is out of range for the ad-
justing screw, the clamp 6858 may have loosened.
With the drive cam 4207 in the rest position, move
the cam follower 6695 in towards center as far as
possible. Then move the tone arm in approximately
ll/z inches from center and tighten the clamp 6858.
For fine adjustment, readjust the needle drop ad-

If the tone arm is bent it may require straighten-
ing. After straightening, run the changer through
a change cycle manually .and make sure the tone
arm has proper height. (For height adjustment see
paragraph B.)

HALF CHANGE CYCLE.

B. Adjusting the Tone Arm Height

The needle should clear the turntable by l'/4 inches
when at maximum height during change cycle.
Adjustments can be made by turning the lift ad-
justing screw 4245. Before the power switch is
turned on the changer should be run through its
cycle manually to make sure that the tone arm
passes underneath the lower change blade and does
not jam.

If this adjustment is correct and the tone arm
doesn't drop low enough to play the bottom record,
inspect the main cam and see that the tone arm
lift pin 6876 is all the way down in the hollow on
the cam. If not, inspect the cam stop roller 6660
and see that it is in the proper position. Grasping
the eccentric arm 7144 and pulling downward may
help if the trouble is due to binding.

Page 8:

C. Adjusfing the Position of Trip
The change mechanism should start when the tone
arm is approximately 11,5; inches from center. The

trip occurs When the tone arm lever presses against
the trip screw 7555 on the pawl latch assembly 7809.
This screw can be adjusted to change the trip posi-

D. Adiusi'ing I'lle Record Drop

Both lower change blades are adjusted to drop
a record simultaneously. A loosened driving crank
4224 would allow a record to drop on one side be-
fore the other. To reset, turn the turntable manually
until the record is just about to drop, loosen the
the driving crank 4224 and adjust change blades
so they are even. Then tighten clamp.

OAK MFG. CO.

BOTTOM VIEW, IN OPERATION.

E. Adjusting Needle Pressure

The needle pressure can be adjusted by turning
the pickup spring adjusting Washer 4308-1 which
changes the pressure of the pickup spring 7818. This
adjustment is made for the particular cartridge
being used and adjustment may be advisable if a
substitute cartridge is used.

TROUBLE SHOOTING

SQUEAKS & NOISES
Squeaks sometimes occur due to friction between
the unplayed stack of records and the spindle. This
may be eliminated by applying a thin coat of wax
or vaseline to the spindle at the point of contact.
Check the oil wick 4228 on the main cam, perhaps
it needs oil. If the wick appears dirty or gummy it

(C)John F. Rider

Page 9:

RQLH. oAK Page 15-'

OAK MFG. CO.

MAIN GEAR ASSEMBLY.

should be removed, thoroughly cleaned, and re-

WEAK OR NO OUTPUT
Check the pickup lead from the pickup to the

If the amplifier is OK. replace crystal pickup.

TURNTABLE WILL NOT TURN

No power applied to the changer.

Faulty switch 7478-4i
Burned out motor winding. (See replacing motor.)
Idler wheel spring disconnected.
Foreign material jamming motor armature.

If in change cycle-cam jammed or tie bar 7562
rubbing against the sub frame assembly 7806.

IMPROPER SPEED
Improper voltage or frequency.
Drag on turntable or motor.
Motor or turntable bearings binding.

FAILS TO TRIP

Starting pawl spring disconnected.

Trip screw missing or set improper.

Bent starting pawl or pawl latch.

Dirt binding starting pawl or pawl latch rivets.

Tone arm lever loosened. (See adjustment A.)

The pickup lead wire which emerges from the
rear of the tone arm and goes down through the
metal base is so placed that it will not hinder the
movement of the tone arm. This lead should be
free at all times, do not attempt to push excess wire
through the base.

(C)John F. Rider

Page 10:

OAK MFG. CO.

TONE ARM ASSEMBLY WITH BRACKET. WASHERS. ETC.

CHIPS RECORDS

Warped records are the most common cause for
jamming or chipping records. Should the change
blades chip fiat records they should be bent to have
a ,06" clearance between them.

RECORDS DROP ON ONE SIDE ONLY
This is most likely due to the driving crank 4224

having loosened, For resetting instructions see Ad-

REPLACING A MOTOR
Remove the turntable by lifting and giving the
spindle a sharp tap to release it. Remove the power

switch by taking out the two Phillips screws. Remove
the switch cover and disconnect the motor wires.
Disconnect the motor ground connection, remove
motor and replace with a new one.

LUBRICATION

Normally, this mechanism should require no ad-
ditional lubrication. However, a drop of any good
machine oil on the turntable shaft bearings, motor
bearings, and frictional surfaces once a year will do

CAUTION: Do not lubricate the trip mechanism or
allow any oil to come in contact with the idler wheel.

(C)John F. Rider

Page 11:

OAK MFG. CO.

SERVICE PARTS LIST

Furl' No. Description Puri No. Description

1842-3 Steel Ball 13g" Diameter
4206 Control Spring
4207 Drive Cam ......
4210 Starting Pawl Spring - 6699 control Button
4214 Pickup Adjusting Sprin ._ _ __ -
4215-37 # 10-24 x 3/8" Phillips ofal Hd. ggiiifgsilggefssembly
M- SC~ (Chrome P1ate)~- - _# 6856 ladexing step
4216 Laich Spmng """ 6857 Scissors Arm
4224 Driving Crank 6858 C1
4228 oil Wick ____________ amp ~
4229 Changer Blade Drivmg Shaft 6859 Tube ,
4231 Pickup Hinge Pin YYYYYYYYYYYYYYYYYYYY 6862 Indexmg -
4232 Changer Blade Driven shaft 6867 Knob Insert
4239 Turntable Bearing 6869 PleUP Shaft -

6694 Pickup Crank
6695 Cam Follower
6697 Bracket eeeeeeeeeeee

4240 Bearing vSupport _ ____- 6870 Pin eeeeeeee
4241 Bearing Support _ ____ 6871 Spring __
4242 Pickup Cartridge _ _ 6872 Spring.__

4245 Lift Adjusting Screw . "___ 6873 Spring _.
4246 Pinion ___________________ . ___.__ 6874 Index Link

4251 Mounting Clip _ __ 6875 Spring (Pickup Crank) __
4252 Mounting Screw "_ 6876 Lift Pin ________________________
4253 Mquntins Semis 6877 Pickup Hinge Pin Tube
4262 R'eJQCt SRng >>- 7101 Rubber Grommet

4272 Indexing Pin Sp g _

4279 changer shaft cap Fg?n?sslflef
4283 Pickup Arm ___________ ____
4292 Pickup Rest Bumper _ _w_____ Egbber Grommet
4302 Motor Cord Clamp _______ 7107 T Onomotor
4308-1 Pickup spring Adjusting Washer 7144 AQ;-

6630-1 Base ________________ _
6638 Cable Clamp ____ 7145 Eccentric Arm Slide _.
6641-1 Post _ _ _ 7146 Slide Spring ................
6641-2 Post _____ _ _ 7477-1 Switch Cover Assembly _

7478-4 Slider Switch Assembly _

7555 6-32 Hex. Hd. Mach. Screw
7562 Tie Bar
7563 Trust Bearing Disc

7580 Needle ..........................
7583 Idler Pulley Kit (For 7102 Motor)
7584 Idler Pulley Kit (For 7106 Motor)
7587 Needle Screw
7800 Base Assembly _
7801 Index Stop and Link Assembly _

7802 Pickup Crank Assembly
7803 Pickup Arm and Shaft Assembly
7804 Index Lever Assembly __
7805 Tie Bar Assembly ......
7806 Sub-Frame Assembly
7807 Eccentric Arm Assembl
7808 Drive Cam Assembly
7809 Pawl Latch Assembly __
7810 Changer Blade Assembly _
7818 Spring Pickup Crank) _____

6642 Pickup Res _.

6643 Starting Pawl __
6645 Eccentric __

6646 Eccentric Ring
6649 Cam Extension
6650 Cam _Extension Spring
6652 Sub Frame ___________________
6653 Sub Frame Bracket _
6654 Cam Shaft
6655 Turntable Sha _
6657 Cam Stop Spring
6659 Cam Stop Lever _
6660 Cam Stop Roller
6661 Bracket ________
6667 Reject Link __
6668 Manual Link
6683 Escutcheon _____
6684 Lower Change Blade
6685 Upper Change Blade

6693 Guide, Index Lever ________

(C)John F. Rider

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