SPECIFICATIONS

The V - M - 950 Tri-o - matic Record Changer Intermix Model is designed to play standard 78 RPM, fine groove 45 RPM, or long-play 33-1 / 3 RPM records of standard commercial dimensions. Records up to 12 inches in diameter can be played manually.

Features of this changer include playing and automatically changing as many as ten - 12 twelve 10 or any assortment of 101 and 12" of the same type (78 RPM or 33-1 / 3 RPM).

A full stack of twelve - 7" 33-1 / 3 RPM records or a full stack of twelve - 7 45 RPM records (with the adapter inserted in the record) will also play on this changer.

The changer shuts off after the last record has been played.

Connect this changer only to an outlet supplying 117 volts, 60 - cycle ac unless otherwise specified. Power consumption 25 watts.

PREPARING FOR OPERATION
SHIPPING BOLTS: Before placing in operation, the machine must be floated freely on the mounting springs. During shipment, the mechanism is secured by means of two shipping bolts. To float the changer, remove the turntable by lifting it straight up the spindle. Turn the two shipping bolts in a clockwise direction as far as they will go and replace the turn table. Before the turntable can be fully seated, the idler wheel must be gently pushed back out of the way to prevent damage to the rubber tire.

OPERATION
Loading
1. Pull straight up on record support knob until record support clears spindle. Swing record support to the left until pin in shaft drops into locating groove.

2. Changer will automatically play ten - 12" either standard or long-play records, twelve - 10" either standard or long-play records, any assortment of ten - 12" and 10" records intermixed, or twelve 7" long-play or fine-groove records.

NOTE; Standard, fine-groove, and long-play records cannot be intermixed. Motor speed control knob must be reset for each type of recording,

3. Place records on spindle and lower to off set shelf. Hold records level and replace record support over spindle.

To Play Standard Recordings
1. Motor speed control knob must be in the 5278" " position.

2. To start, turn changer control knob to " Rej. " and release. Changer will operate automatically until the last record has been played. Pickup arm returns to rest and the changer control knob to tie "Off" position. Changer automatically stops.

LEVELING RECORD CHANGER: It is essential to have the record changer absolutely level. Use a torpedo or similar type level on the record changer baseplate. Use adequate shims to level the record changer pan or radio combination cabinet to achieve perfect level.

To Play Long - Play (33-1 / 3 RPM) Records
1. Motor speed control knob must be in the * " 33" position.

To Play Fine - Groove (45 RPM) Records
1. Motor speed control knob must be in the " 45" position.

2. These records are manufactured with a 1-1 / 2" spindle hole. It is essential that a record adapter be inserted into each 45 RPM record to be played. This is necessary to reduce the spindle hole to conventional size.

REJECTING: To reject a record at any time while changer is operating, turn changer control knob to " Rej. " and release.

STOPPING: To turn off changer before automatic shut-off, turn changer control knob to "Off". Lift pickup arm and place on rest.

UNLOADING: Lift the record support and swing to the left until pin on shaft drops into locating groove. Lift stack of records straight up and off spindle.

MANUAL OPERATION: To play single records or home recordings, allow the changer to go through its complete shut-off cycle. Lift the record support arm and move it to the left clear of the turntable. Place record on spindle and lower to spindle shelf. Tilt record down toward the rear of pickup arm and lower record to turntable. Turn changer control knob to " On" position only. Raise pickup arm and place in lead-in groove of record.

REPEATING OF 7 10 OR 12" RECORDS: TO repeat records, swing record support clear of spindle, place record on the turntable, and start changer. Record repeats until control is turned " Off. " If a 12" record is repeated, wait for the changer to finish cycling and reposition the pickup arm manually to the 12" position.

SUGGESTIONS: When loading and unloading the changer, use care to prevent bending of the spindle. Records should not be left on the spindle except during operation of changer. Records will warp. When machine is not in use, it is suggested that the speed control knob be left in the " 78" position. For best reproduction, keep needle and records clean. Store records flat, in folders or in albums. Do not lay record on record.

CHANGE CYCLE This changer is provided with what is known as a velocity trip mechanism. The change cycle is start ed by the faster inward motion of the pickup arm when the needle enters the trip grooves at the end of the record. Only records having fast-finishing grooves before the eccentric cycling groove will operate this velocity trip.

The pickup arm and hinge assembly and trip finger cam (105) are secured at opposite ends of the pickup arm shaft and sleeve (43) so that they move in unison. As the pickup arm nears the end of the record, the trip finger cam (105) pushes the trip link (110), which, in turn, engages the trip lever (68) rotating the pawl lever (65) to move the trip paw) (69) toward the hub on the turntable. While a record is playing, the small motions of the trip pawl (67) are not sufficient to cycle the mechanism because on each revolution of turntable the wiping contact by the hub projection moves the trip pawl (67) back to clear the projection.

In the first revolution of the turntable during which the pickup arm advances rapidly, the trip pawl (67) is moved far enough to definitely engage the projection on the turntable hub. The gear on the turntable hub will now engage the main gear (62) and start its rotation. This, in turn, starts the lateral motion of the slide and cam assembly (120). The slide and cam assembly (120) moves to the rear through the action of an eccentric pin (71) on the main gear (62) moving in the cross slot on the slide and cam assembly (120). As the slide and cam assembly (120) begins to move, the cam surface at the rear pushes the lift pin (35) upward, raising the pickup arm clear of the record. At the same time, the tab on the rear of the slide and cam assembly (120) contacts the trip finger cam (105) swinging the pickup arm clear of the turntable.

The front edge of the ejector link slot in the slide and can assembly (120) then contacts the ejector link on the ejector link assembly (117). The ejector link moves the pusher shaft and housing assembly (14) upward actuating the spindle assembly (3), causing the record pusher (6) to move straight up so as to enter the center hole of the record, and then to be pivoted forward, dropping a record to the turntable.

The spindle guide (4) inside the spindle (3) prevents more than one record at a time from being ejected. When records are removed from the turntable, the guide slides straight up allowing free movement up the spindle, then slides back into position by gravity.

Simultaneously, the tab on the rear of the slide and cam assembly (120) contacts the pickup arm return locator (95), moving it clear of the reset lever (81); at the same time, the pickup arm return locator (95) is locked in position with the trip finger cam (105) by means of matching holes in the pickup arm return locator (95) and detents in the trip finger cam (105). This is accomplished by the pressure of the com pressed conical lift pin spring (107) overcoming the pressure of the lift pin compression spring washer (97).

At the same time, the cam surface of the bracket on the main gear assembly (62) moves the reset lever (81) to mid-position (10" set-down) where it is held by the 12" record selector (42). The slide and cam assembly (120) continues to the rear and then starts forward. If 7" records are being changed, the rubber bumper (89) of the 7 set-down lever (90) is free to move upward permitting the other end to drop into the hole in the main gear (62) as this gear rotates. This action of the 7" set-down lever (90) raises the reset lever (81) to the upper position (7" set-down).

If 10" records are being changed, the 7 set-down lever (90) will not operate as the rubber bumper (89) will contact the edge of the record and the reset lever (81) will remain in the mid-position (10'set-down) as originally placed by the caming action of the bracket on the main gear (62).

If a 12" record is being changed, the edge of the record strikes the 12" record selector (42) releasing the reset lever (81) which drops to the bottom position (12" set-down).

As the slide and cam assembly (120) continues for ward, the tab on the rear of the slide will move clear of the pickup arm return locator (95) and trip finger cam (105), which are still locked together. These rotate under the action of the pickup arm return spring (87) until one of the three set-down steps in the pickup arm return locator (95) strikes the reset lever (81), which has been positioned by the record being changed (see above). This stops the inward movement of the pickup arm return locator (95), trip finger cam (105) and pickup arm. The pickup arm is then lowered to the lead-in grooves of the record at this point as the lift pin (35) rides'down the rear cam surface of the slide and cam assembly (120). As the pressure is released from the conical lift pin spring (107), the lift pin compression spring washer (97)

separates the pickup arm return locator (95) and trip finger cam (105), permitting the pickup arm to ride freely across the record.

As soon as the last record has been dropped, the record support assembly (1) drops below the shelf on the spindle assembly (3) and the lower end of the record support post contacts the arm of the shut-off lever on the shut-off lever bracket assembly (117). This pulls the control link (112), which, in turn, rotates the crank of the lever assembly (102). This forces the tab on the lever assembly (102) against the slide and cam assembly (120). At the end of the change cycle, which drops the last record, this tab on the lever assembly (102) drops into the cut-out in the main slot on the slide and cam assembly (120), and the other end of the lever assembly. (102) is pushed against the pickup arm return locator (95).

When the last record has been played, the change cycle starts again; however, this time, as the pickup arm return locator (95) is pivoted clear of the reset lever (81) by the tab on the slide and cam assembly (120), the lever assembly (102) rises to the shut-off position. A tab on the lever assembly (102) raises the trip link (110) to the upper position. As the pick up arm return locator (95) starts to return the pickup arm to the record, it is stopped by the lever assembly (102) with the pickup arm positioned over the

pickup arm rest post (45). The main gear continues to rotate pulling the trip link (110) forward to reset it. A tab on the upper surface of the trip link (110) contacts a lever on the control shaft assembly (88) rotating the control shaft assembly to turn off the motor and return the control knob to the "Off" > position.

As the slide and cam assembly (120) moves forward, the lift pin (35) rides down the rear cam surface lowering the pickup arm to the pickup arm rest post (45).
LUBRICATION Additional lubrication should not be required for the life of the changer, but in cases of unusual use or high-operating temperature, the changer should be lubricated as follows:

Apply Andok "B" to:

1. Edges of all slots in slide and cam assembly (120),

2. Outer edges of tines on forked end of slide and cam assembly (120).

3. Lift pin cam surface on slide and cam assembly (120).

4. Lower surface of pickup arm return locator (95),

5. Inner surface of tab on rear of slide and cam assembly (120).

6. Turntable ball bearing (10).

7. Eccentric pin on main gear assembly (70).

Apply a small quantity of light mineral oil to:

1. Pickup arm shaft and sleeve bearing (43).

2. Turntable and spindle bearing.

ADJUSTMENTS
NEEDLE SET - DOWN (Refer to Figure 4); The set down position of the needle is adjusted by means of the set-down adjustment screw (41) mounted on the hinge arm assembly (40). Turn this screw adjusting pickup arm for correct set-down on 10" record. When the correct set-down is obtained for the 10" position, the 12" and the 7needle set-down will also be correct.

PICKUP ARM HEIGHT (Refer to Figure 4): The pickup arm height is adjusted by the lift screw (21) located at the rear of the strengthener. To raise the height of the pickup arm, turn this screw counter clockwise. To lower the pickup arm, turn clockwise. The pickup arm height should be adjusted so that with a 1-1 / 8" stack of records the pickup arm lifts 1/4". straight up as the change cycle starts.

NEEDLE PRESSURE: The needle pressure should be between 10 and 12 grams. Adjustment may be made by loosening the screw (22) on the slide which moves in a slot in the tone arm strengthener (see Figure 4). Move the slide back and forth until the correct needle pressure is obtained.

TROUBLE CHART

SYMPTOM CAUSE REMEDY

Turntable does not revolve when control is turned to " Om.'

1. No current at motor.
2. Motor defective.
3. Motor idler wheel (74) not engaging turn table rim,

(a) Check that current is reaching ac leads of changer.
(b) Check that switch is closing.
(c) Check wiring and soldered terminals in the changer.

(a) Remove turntable to allow motor to operate without load. If current is reaching motor and drive spindle does not rotate, the motor is defective. Repair or replace.

If drive spindle is turning but turntable is not:
(a) Check motor idler assembly to determine if it is free to contact the drive spindle and turntable rim.
(b) Wipe off inside rim of the turntable (2) to remove flock, or if oily, clean the turntable rim and rubber tire of the idler wheel (74) with naphtha.

Changer does not cycle when the control knob is turned to the " Rej. "

1. The manual reject not actuating the trip.

(a) Turn the control knob (46) to the reject position, hold and see that the control shaft assembly (88) has moved the trip link (110) to the rear. This should actuate the trip pawl (67) on the main gear (62), which will bring the spur on the trip pawl (67) in contact with the hub gear on the turntable hub.
(b) Check for binding of the pawl lever (65), the trip lever assembly (68) and the trip pawl (67). If binding occurs, clean out all foreign matter and check for freedom.

Control knob cannot be turned to "On" position,

1. Machine shut off during cycle.

Turn the turntable clockwise, by hand, until the contra knob (46) is free.

Pickup arm strikes records on spindle when it raises, or pick up arm rest when it moves out.

1. Pickup arm height not adjusted properly.

(See instructions for adjusting pickup arm height under " Adjustments. ")

Turntable speed too slow

1. Binding in turntable bearing.
2. Motor pulley too small in diameter.
3. Line voltage too low.
4. Operating temperature too low.

Check the turntable bearing for freedom. Hold the motor idler wheel (74) out of engagement with the turntable and spin the turntable, by hand, to see if it turns readily and coasts for a long time. If binding occurs, remove turn table, clean off foreign matter, and lubricate with light mineral oil.

Replace the motor pulley with one having a greater diameter.

The line voltage should not be less than 105 volts or the turntable may be too slow.

If the machine has been stored in a cold place or operated in surroundings at a temperature of less than 600 F., the turntable speed may be too slow.

Turntable speed too fast.

1. Motor pulley too large in diameter.

Replace the pulley with one having a smaller diameter, or grind one or two thousandths off the pulley.

Turntable stalls or slows down during cycle

1. Motor idler not engaging turntable.

(See " Turntable Does Not Revolve When Control Knob Is Turned to 'On' Position. ")

2. Turntable bearing tight.

3. Operating temperature too low.

4. Binding in drive mechanism.

5. Binding between pickup arm lift pin (35) and lift pin cam surface on slide and cam assembly (120).

6. Spindle pusher spring compressing too far.

7. Motor weak.

8. Grease on idler wheel.

9. Idler wheel bent and not making positive engagement with drive pulley.

10. Turrets unseated from lock ring on turret shaft.

11. Idler wheel tension spring weak.

(See " Turntable Does Not Revolve When Control Knob Is Turned to'On'Position.)

The line voltage should not be less than 105 volts.

Hold idler (74) away from turntable, or remove idler wheel. Cycle machine by turning turntable slowly by hand. The main gear should turn freely for the complete revolution without binding at any point:

(a) If binding occurs, check for foreign matter in the gear teeth, a bent gear bearing, or bent spindle bushing Straighten or replace. Clean and lubricate.

Lift pin should ride freely on cam surface without binding.

Cycle the changer and watch the relationship between the bottom of the pusher housing and the lower button of the pusher housing. Just before the slide and cam (120) has completed its backward motion, the pusher housing should stop its upward motion and the lower button should continue up. 005 to. 047" more, slightly compressing the pusher spring. If the spring compresses too much, the changer may stall on the shut-off cycle.

When everything checks all right, but the changer still stalls in cycle, the motor may be weak.

1. Wipe off idler wheel rubber tire; inner rim of turn table and rubber belts with naphtha.

1. Straighten idler, or replace, as necessary.

Remove turret and center lock ring. (If lock ring is distorted, replace with new lock ring.) Replace turret and press down to assure turret of being locked to the turret shaft. (Turret will snap into position when properly locked.)

Replace spring or bend motor tension spring anchor bracket to give desired tension.

Changer continues to cycle.

Reject mechanism binding.

(a) Make certain the trip link (110) is not frozen in the reject position.

(b) Make certain the changer control lever (88) is not binding and that it actuates the trip link (110) when the changer control knob (46) is turned to reject.

(c) Check for binding of trip pawl (67), trip lever (68) and pawl lever (65); these must be free to turn easily.

(d) Check the changer control linkage (23), (53) and (88).

Noise during playing of record.

1. Motor rumble.

2. Defective turntable bearings (10).

3. Defective motor idler wheel.

4. Defective record.

5. Turntable scrapes.

6. Squeaks.

7. Pulleys on motor not properly seated.

8. 7" lever (81) loose.

If a low-pitched rumbling sound comes from the loud speaker while a record is being played, check motor grommets to be sure the motor is freely suspended on them. The motor lead wires should have slack to allow the motor to float. Motor rumble may also come from an unbalanced motor rotor; in this case, replace the motor,

Defective turntable bearings can cause rumble. Check for foreign matter in the bearing, defective balls, binding between balls and ball retainer; rough surface on washers. Clean ball bearing, sleeve bearing, and washers; lubricate with Andok "B" and light mineral oil.

A rapid thumping sound while the motor is running may indicate a flat spot on the motor idler wheel (74). If this condition does not clear up after ten minutes of running time, remove the turntable and check the rubber tire on the idler. If the surface of the rubber tire is not smooth and even, replace the idler. Should the bearing of the idler wheel show signs of excessive wear or be extremely wobbly, the idler wheel should be replaced. Worn or defective records cause needle scratch and distortion of the recorded sound. If the record is warped, it may slip on the other records causing "Wow" (a waver in the recorded sound). An enlarged hole in the record can also cause " Wow.'

If a scraping sound occurs as the turntable revolves, check:

(a) Turntable warped, causing outer rim to rise and fall.

(b) Motor idler or mounting plate bent.

Squeaking sound as changer operates indicates lack of oil. Lubricate points indicated under "Lubrication. "

Check that pulleys are properly seated.

Check 7" lever washer (100) and screw (101) to see if they are tight.

Distortion of Recorded Sound.

1. Defective record.

2. Defective amplifier.

3. Bad cartridge.

(See "Noise During Playing of Record. ")

Check phonograph amplifier and speaker.

Replace. (See "Defective Cartridges")

No Sound During Playing.

1. Defective cartridge.

2. Defective wiring.

3. Defective amplifier.

4. Loose cartridge terminal clips.

Replace. (See " Defective Cartridges. ")

Check pickup leads for a shorted or open lead.

Check phonograph amplifier and speaker.

Remove, squeeze together slightly, and replace.

Excessive Record Wear
1. Binding on pickup arm.

(See "Needle Does Not Track Across Record Properly."

Changer does not shut off after last record has been played

1. Record support binding (1).

The record support must drop below the off-set shoulder of the spindle or the changer will not shut off. (See "Two Records Drop at Once. " 3)

2. Lever assembly binding (100).

3. Control link broken (112).

4. Spring (115) loose or broken.

5. Shut-off lever bind-ing.

Clean out dirt and make sure this operates smoothly.

Replace.

Replace.

Check lever and if bent, straighten.

1. Horizontal defects.

Rough pickup arm motion.

(a) Check pickup arm return locator (95) for tightness.

(b) Check that pickup arm return spring (87) is not weak and is hooked up.properly.

(c) Check that fiber washer (95A) is installed under pick up arm return locator.

2. Vertical defects.

(a) Lift pin (35) binding; clean out dirt and lubricate.

(b) Slide and cam (120) binds; check bearing points clean and lubricate.

(c) Burrs in main slot in slide and cam (120) - remove with fine file.

(d) Ejector lever on ejector bracket assembly (117) binding in slide and cam slot: straighten, remove burrs, and lubricate.

(e) Pickup arm shaft and sleeve binding: clean and lubricate,

Noise during change cycle.

1. Tines on the forked end of the slide and cam assembly (120) bent.

2. Control lever bent.

3. Lack of lubrication Grinding noise.

Replace.

Straighten or replace. Check that "C" washer (95) holds.

Lubricate ejector lever (117) where it contacts lower end of spindle (3).

Control knob does not detent on " 33, " " 45, "or" 78" positions.

1. Bent parts.

(a) Insure that forked shaped stamping under idler is not catching in de tent notch. Straighten or replace motor..

(b) Insure that speed control arm (126) and speed control rod (77) are not bent.

Cartridge drags on record.

1. Needle bent.

2. Cartridge mounting screws loose.

Replace.

Tighten.

Shuts off when last re cord drops.

1. Shut-off spring (115 and link (112) too short.

2. Shut-off bracket (113) bent.

3. Shut-off link (112) bent.

4. Shut-off lever assembly (102) binding.

Check length of shut-off spring (115) and shut-off link (112) by comparing with another set-may be too short. Replace.

Straighten or replace.

Straighten or replace.

(a) Check for burrs: remove with fine file.

(b) Check for tight bearings: clean and lubricate.

Will not play manually.

1. Trip link (110) bent.

2. Trip finger cam (105) bent.

Straighten or replace.

Straighten or replace.

Impossible to adjust set-down.

1. Pickup arm shaft and sleeve assembly (43) defective.

Shift the safety plate (39) toward the eccentric set-down adjusting screw (41), and tighten pickup arm shaft and sleeve nut (36). Hold pickup arm against rear stop and push on trip finger cam (105). The safety plate (39) should move away from the set-down adjusting screw (41) and snap back when the trip finger cam (105) is released: if it does not, replace the pickup arm shaft and sleeve assembly (43). Hinge pivot screws may be adjusted favoring one side or the other.

Record does not drop when changer cycles.

1. Spindle pusher shaft and housing assembly (14) broken.

2. Record pusher (6) in spindle not moving far enough forward to reject a record.

3. Record pusher (6) raises outside the spindle body (7).

If the pusher shaft (inside the spindle) is broken, the lower end (housing) will drop out of the spindle (7) (see Figure 5). Loosen spindle nut (78) and remove spindle (3). Replace with new spindle unit.

The record pusher should move up inside the spindle body (7), then move forward until it has reached a point flush with, or a maximum of,. 010" beyond the spindle body (7).

To insure that the record pusher (6) is all the way for ward, the lower button on the shaft and housing assembly (14) should be raised high enough by the ejector lever to slightly compress the pusher spring inside the pusher shaft and housing assembly (14). (See'Turntable Stalls During Cycle. ") If the spring is compressed and the re cord pusher (6) does not move far enough forward to eject a record, the spindle (3) should be replaced. If a record is not pushed completely off the ledge, it may hang on the spindle momentarily, then drop on the pickup arm when it moves in over the turntable.

When changer cycles, the record pusher (6) should rise up just inside the spindle body, then move forward inside the center hole in the record. If the record pusher (6) rises outside the spindle body (7), it will raise the record instead of pushing it off the spindle ledge. Remove the spindle (3) and replace with a complete new spindle assembly.

Two records drop at once

1. Hole in record too large.

2. Spindle guide (4) not fully down.

3. Record support (1) binding on spindle, or bent out of square with shaft.

Check the diameter of the hole in the record. An over size hole will cause two records to drop at once.

If the spindle guide is not all the way down, more than one record may be dropped at a time.
(a) Check the guide to be sure it is free and does not bind at any point. Clean out foreign matter or straighten if necessary. Do not oil.

(b) When records are placed on the spindle, be sure the guide is all the way down. The guide will normally raise as a record is being dropped, but it should re turn to place immediately, by gravity.

The record support (1) must be able to slide freely, by gravity, down the spindle. If the support does not follow the records down as they are being ejected, two or more records may be ejected at once. If binding occurs:

(a) Check the spindle (3) to determine if it is straight. Bend carefully with the fingers, if necessary.

4. Record pusher (6) defective,

5. Slide play in spindle (3).

(b) Straighten the record support (1) if it is not square with the record support shaft.

(c) When the pin in the record support shaft has just entered the slot in the record support shaft post on the baseplate, the play in the record support (1), as it is swung from side to side, should be equal on both sides of the spindle. To correct bent condition, hold the support shaft and carefully force the record support into proper position. If the support is loose on the shaft, remove the knob and restake with hammer and punch,

The record pusher (6) may be deformed, etc. This may cause two records to drop at once. Replace with new pusher or replace spindle assembly.

Tighten spindle nut (78). If stripped, replace.

Record hits pickup arm

1. Record pusher (6) not moving far enough forward to eject re cord.

2. Record pusher (6) extending beyond out side diameter of spindle.

3. Pickup arm not adjusted properly.

(See " Record Does Not Drop When Changer Cycles -
2.)

Cycle changer, by hand, until pusher shaft and housing assembly (14) is at the top of its travel. Using new re cord as a gauge, pass it over the spindle to see if it binds at any point. File off high points on record pusher (6), with a fine file, until record will pass freely over spindle.

(See "Adjustments ")

Needle does not set down on 10" record in proper position

1. Pickup arm not adjusted properly.

2. Pickup arm shaft and sleeve (43) binding.

3. 7" set-down lever (90) and 12 record selector (42) not operating properly.

4. Needle bent.

5. Wire spring (83) broken.

6. Bent pickup arm return locator (95).

7. Bent trip finger cam (105).

(See " Adjustments ")

(a) Loose nut (36) on pickup arm shaft and sleeve (43).

File off burrs and rough surfaces. Polish and lubricate shaft.

Insure that the proper operation and reset of the 7" set down lever (90) and 12" record selector (42) is not being interfered with.

Replace with new needle.

12" record selector (42) does not cock: check for broken 12 record selector spring (83). Straighten or replace.

Straighten or replace.

Needle does not set down on 12" record in proper position

1. Diameter of 12" record undersize.

2. Enlarged center hole in record.

The set-down position of the needle for 12" records is determined by the edge of the record striking the 12" record selector (42). If a 12record has a diameter of less than the standard size of 11-7 / 8 plus or minus 1/32 it may fail to depress the 12" record selector far enough.

An enlarged center hole might fail to set the 12" record selector because it could produce the same effect as a small record.

3. Pickup arm not adjusted properly
4. Binding of pickup arm shaft and sleeve (43).

5. Reset lever spring (82) broken.

6. 12" record selector spring (83) broken.

7. 12" record selector (42) binding.

8.'Bent pickup arm return locator (95).

9. Bent trip finger cam (105).

(See " Adjustments ")

(a) Loose nut (36) on the pickup arm shaft and sleeve (43). Tighten. Clean and polish shaft (43), and lubricate with light oil.

Replace spring (82).

Replace spring (83).

The 12 record selector must be free to operate smoothly. Clean out dirt and straighten if bent, or re place.

Straighten or replace.

Straighten or replace.

Needle does not set down on 7" record properly.

1. 7" set-down lever spring (9 9) broken or weak.

2. Pickup arm not adjusted properly.

3. 7" set-down lever screw (101) loose.

4. 7" set-down lever (90) hitting frame or baseplate when it goes through hole in frame.

5. Reset lever (81) bent.

6. 7" set-down lever. (90) does not fall into opening in main gear.

7. Bent pickup arm return locator (95).

8. Bent trip finger cam (105).

Replace.

(See " Adjustments ")

(a) Loose nut (36) on pickup arm shaft on sleeve: tighten.

Tighten.

Straighten, or replace.

Replace.

Replace.

Straighten, or replace.

Straighten, or replace.

Changer does not cycle when record has been played.

1. No finishing trip groove on record.

2. Needle jumps out of grooves in record.

Check record for eccentric trip groove in center of re cord. Some old records and home recordings do not have this eccentric trip groove.

(a) Check trip pressure: the lateral pressure should not exceed 3 grams. (If pressure is excessive, see " Changer Trips Before Needle Reaches End of Record.")

(b) The record may be defective: the finishing groove is often too shallow. Check with a record that is known to be good.

3. Trip pawl (67) binding on gear face.

4. Trip finger cam (105) bent.

5. Trip link (110) bent.

(c) The needle point may be damaged or affected by an excessive accumulation of dust, lint, etc.; check needle pressure as described under " Adjustments. "

(d) There may be binding in the pickup arm shaft and sleeve assembly (43) or between the pickup arm return locator (95) and the trip finger cam (105): see " Needle Does Not Track Properly Across Record. ")

The trip pawl must be free to move forward and engage the boss on the turntable hub when the trip lever releases it. Check for burrs or foreign matter lodged between the trip pawl (67) and main gear (62). Do not oil as this might collect dirt and gum up the pawl.

Straighten, or replace.

Straighten, or replace.

Changer trips before needle reaches end of record.

1. Hole in record too large.

2. Binding of trip link (110).

If the hole in the record is too large, the groove may turn eccentric with the spindle and cause premature tripping With the trip link released, check the trip link for freedom of motion. It should be free to move without binding

Needle does not track across record properly.

1. Needle may be clogged by accumulation of lint, dirt, etc., or worn.

2. Trip finger cam (105) does not disengage from the pickup arm return locator (95) when cycle i's completed.

3. Check the bearing in the pickup arm post for binding.

4. Changer not level.

5. Pickup leads too tight.

(a) Clean foreign material from around needle (105).

(b) Check needle to see if the tip is bent or broken. Re place, if necessary. (Refer to paragraph on "Damaged Needle. ")

There should be a 1/32" gap between the trip finger cam (105) and the pickup arm return locator (95) when the machine is not in cycle. If the gap is small enough to allow the parts to touch and bind as the needle moves across the record, the compression spring washer (97) may be weak or broken. Replace.

(a) Check pickup arm return locator (76) and trip finger cam (80) for binding. (See 2 above.)

(See Leveling Record Changer During Long Play " under "Preparation for Operation. ")

Give the pickup leads enough slack to allow the tone arm to move freely across a record.

CARTRIDGES
1. Damaged Cartridge (Astatic LQD)

To remove the cartridge, proceed as follows:

(a) Rotate the cartridge so the cartridge mounting screw (28) is facing downward.

(b) Loosen the set screw (26) and remove the cartridge control knob (27).

(c) Carefully pull the cartridge lead up from the rear section of the arm until adequate slack is obtained.

(d) Remove the cartridge mounting screw (28),

(e) Disconnect the pickup leads and re move cartridge.

(f) Replace cartridge and connect pickup leads.

(g) Secure pickup cartridge to mounting bracket (18).

(h) Replace the cartridge control knob (27) and tighten set screw (26).

(i) Push excess pickup lead into rear section of pickup arm.

Damaged Needle (Astatc LQD)

(a) Rotate cartridge control knob to correspond with needle to be removed.

(b) The needle may now be removed by pulling it straight out of its mounting.

(c) In replacing the new needle, make sure that the colored needle is used on the side of the pickup cartridge having the corresponding color spot.

2. Damaged Cartridge (Shure P - 81)

(a) Disconnect the pickup leads.

(b) Loosen the two cartridge mounting screws and remove cartridge.

(c) Replace cartridge and connect leads.

Damaged Needle (Shure P - 81)

(a) Loosen knurled thumb nut that secures needle to the cartridge.

(b) Carefully remove needle and replace with a new needle of the same part number.

CAUTION: The replacement needle will have to be adjusted, before it is tightened in the pickup cartridge, to assure that the needle shank is securely held by the knurled thumb nut. Do not use pliers on knurled thumb nut. Tighten with fingers only.

3. Damaged Cartridge (Shure P - 77)

(a) Rotate the cartridge so the cartridge mounting screws may be loosened.

(b) Remove the cartridge control knob (27).

(c) Carefully pull the cartridge lead up from the rear section of the arm until adequate slack is obtained.

(d) Disconnect the leads and remove the cartridge.

(e) Replace the cartridge and connect the pickup leads.

(f) Secure the cartridge to the mounting bracket (strengthener) (29).

(g) Push excess pickup lead into rear section of pickup arm and re-install plastic cartridge control lever,

Damaged Needle (Shure P - 77)

(a) Rotate the cartridge control knob to the position corresponding to the type needle to be replaced.

(b) Loosen the knurled thumb nut that secures needle to the cartridge,

(c) Carefully remove needle and replace with a new needle of the same part number.

CAUTION: Make sure that the colored needle is used on the side of the pickup cartridge having the corresponding color spot. The replacement needle will have to be adjusted, before it is tightened in the pickup cartridge, to assure that the needle shank is securely held by the knurled thumb nut. Do not use pliers on knurled thumb nut. Tighten with fingers only.

PARTS LIST

GENERAL INFORMATION
THE MODEL 950 SERVICE MANUAL (V - M FORM 2544) MAY BE USED IN THE SERVICING OF ALL MODEL 950 TRI-O-MATIC RECORD CHANGERS, EVEN THOSE PRODUCED AFTER OCTOBER 15th, 1950 AT WHICH TIME MANY PRODUCTION CHANGES WENT INTO EFFECT. These changes are outlined in the following paragraphs and should be noted, as it is of the utmost importance when ordering replacement parts.
You will find that most of the new items are interchangeable with those used in earlier models with the exception of the shut-off lever (item 126) V - M part 2591. Should it become necessary to replace this item, the slide and cam assembly (item 120). V - M part 2288 should also be replaced and vice versa with the later design. (Refer to parts list in this supplementary manual).
The last record shut off mechanism has been altered slightly and functions as follows: When the last record is dropped to the turntable the record support arm also slides downward contacting the shut off bracket assembly. This, in turn, pivots the shut off lever (126) through the media of spring (131) and connecting shut off wire. However, the full pivot of the shut off lever (126) is blocked by the escape lever (130A) of the slide on cam assembly (130), which has moved in under the shut off lever. This prevents the changer from shutting off. As the changer completes, the change cycle, the shut off lever (126) slides off the escape lever (130A) and drops into the slot of the cam and slide assembly (130). When the last record has been played, the change cycle starts again, however, this time, as the pickup arm moves outward, the way is clear for the shut off lever (126) to raise to the shut off position, thus causing the mechanism to shut off upon completing the change cycle (see Change Cycle " in the V - M 950 Manual, Form No. 2544, for complete description of the shut off mech.).

REASONS FOR ADDITIONS AND CHANGES To The Record Changer Mechanism

Hinge Button Bearing
This hinge button bearing replaces the 2310 pivot screw in order to maintain better control over the vertical friction of the tone arm.

Jam Nut
This jam nut replaces the 1975 palnut inasmuch as the palnut had tendency to strip the threads of the brass housing in which the tone arm lift pin rides.

Lock Washer
This lockwasher replaces the 2937 flat washer inasmuch as a locking device was needed to secure the 2887 jam nut into position. No lockwasher was needed with the 1975 palnut as the palnut was self-locking.

Brace for Base Plate
This brace was added to the baseplate in order to straighten the well in which the turntable rides to prevent turntable scraping and also to prevent bending of the baseplate while in transit.

Record Support Hold down Spring
This spring was added shortly after the beginning of the 950 production in order to facilitate the shut off after the last record had been played.

"C" Washer for Record Support
This "C" Washer was omitted from the original exploded view of the Model 950 and it was felt necessary to show it on this drawing.

Spring for Trip Lever Assembly
This spring replaces the 2516 spring washer in order to maintain a more uniform friction within the trip lever assembly.

Motor Mtg. "C" Washer
This "C" Washer was adapted for motor mounting purposes inasmuch as the original snap fastener proved to be unsatisfactory.

Slide Support
This support was added to the mechanism to stabilize the slide and cam assembly during the change cycle.

4-40 Hex Hd, Screw
This screw is used to secure the # 3915 slide support in position.

Reject Spring
This spring replaces the 1721 reject spring and tends to give better return action on the reject rod assembly.

Shut Off Lever Assembly
This replaces the 2591 shut off lever assembly which consisted of two separate items and will also serve to simplify and improve upon the last record shut off.

Shut Off Lever Spring
This replaces the 2585 shut off lever spring inasmuch as the 2585 spring did not have the proper tension for the new shut off lever.

Tinnerman Nut
This tinnerman nut replaces the 2932 self tapping screw on some models due to change in the die cast subframe.

Escape Lever Spring
This spring was necessary to help actuate item 130A which is an escape lever located on the main slide and cam assembly.

Slide and Cain Assembly
This replaces the 2288 slide and cam assembly inasmuch as the earlier assembly did not carry the escape lever and spring for the shut off mechanism.

Shut off Spring
This spring replaces the 2978 shut off spring inasmuch as the 2978 Spring did not have the proper tension when used with the new shut off mechanism

Most of the changes which have taken place on the Model 950 Tri-O-Matic record changer were so done to improve upon the product and from time to time we will incorporate more changes either to simplify or improve upon the mechanism.