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Trying to repair circa 1965 HMV "Imperial" Solid State record player. The turntable is not revolving at the correct speed so I want to dismantle and see if I can fix it or find what parts I need. So my question is :- How do I remove the turntable?

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A turntables speed can be affected when components deteriorate. Records sound distorted. In replacing any part, use an exact duplicate or a substitute that is recommended by the manufacturer.


A turntable platter rotates at 78, 45, or 33 and 1/3 revolutions per minute by direct drive(a drive wheel and rubber rollers) or by belt drive.
. To check the speed, chalk a point on the edge of a record and one on the chassis near the platter. Line them up, and then turn on the record player. Clock how many times the two points meet during 1 minute.

Remove the platter by prying the c-clip from the spindle with needle-nose pliers and lifting the spindle out, then lift the platter from the chassis.

On a direct drive, the drive wheel is held to the chassis by a c-clip that clutches a drive shaft. While grasping the clip with the needle-nose pliers, pry it from the shaft with a small screwdriver. Normal 0 MicrosoftInternetExplorer4 Don't forget the positions of the washers above and below the wheel so that you can replace them correctly.

To replace a belt, remove the turntable platter and wrap a new belt around the pulley and the rim under the turntable platter. Reinstall the platter.
Remember to always use care when servicing anything that uses electricity; always unplug before removing or replacing any part.
Even if your turntables belt is stretched it may need to be replaced because it can have an effect on the quality of the sound. Just these few replacements could turn an old record player into tip top shape.

Turntable Setup

General
Most turntable companies provide reasonably good instructions for the proper setup and operation of their products. But sometimes, these instructions are not very clear, or are translated in a peculiar way. Hopefully, this section will remedy some of the questions that come up during turntable setup


The Platter

Direct Drive
For direct drive turntables, place the platter over the spindle and lower into place gently. There is usually a strong magnetic force that will pull the platter into place. Be prepared for that and lower the platter gently into position on the spindle. Now. place the mat on top and this step is complete.

Belt Drive
There are 2 kinds of belt drive. dual platter designs and single platter designs. In the dual platter design the 2 parts are the drive or inner platter and the top platter. The drive platter is permanently part of the turntable body. The drive belt runs around this platter and the motor pulley. Install it now if required. Now place the top platter in position, then the top mat and this step is complete.
In a single platter design, there must be a way to contain the belt when installing the platter. If you look under the platter, you will see an inner ring running around the middle third of the platter. The belt should be already installed by the factory there. If not, do it now. The belt will stretch and stay in place. Now, place the platter over the spindle. You should notice a hole in the the top platter. Align this hole over the motor spindle. Now, reach in and pull the belt across to the motor pulley. Now place the top mat and this step is complete.

Cartridge Mounting

Standard Mount Style
Some turntables come with the cartridge already mounted. This makes life easy. But if you are changing the cartridge or simply need to mount it, here are the details.
You will need:

  • Small screw driver
  • Small needle nose pliers
  • Overhang Gauge
  • Cartridge Hardware
  • Contact Enhancer (optional)
  • Tonearm Headshell (if separate)
I will use the procedure we follow here for Stanton cartridges and Technics Head shells, the process is basically the same for other tonearm designs.
Use the self threading plastic slip on nuts, they prevent electrical grounding of the cartridge body to the headshell. This can be a major cause of ground loop hum. Slip the nuts onto the cartridge mounting flange wings.

FIRST, REMOVE THE NEEDLE AND PLACE IT OUT OF THE WAY
Now, hold the cartridge in place against the bottom of the head shell and insert a screw through the top of the head shell and into the self threading nut. Use the screwdriver to start this screw. Once started, insert a screw in the remaining side and start it too. Snug each screw into place a little at a time, until they are just almost home. Leave the cartridge slightly loose so it can move back and forth in the slotted openings.
NOW, INSERT THE NEEDLE, BUT FROM HERE ON BE VERY CAREFUL
Now slip the overhang gauge onto the back of the head shell and use your eyes to sight down the tip of the gauge. Move the cartridge in the slots until the stylus tip is just in line with the end of the gauge. This is the proper location for the cartridge. carefully tighten only one of the screws and re check to see that the overhang is still correct. Now, remove the gauge , and looking a the outline of the cartridge body against the headshell outline, slightly rotate the cartridge body until it is square with the head shell outline. Now tighten the remaining screw and recheck. If all is correct, replace the stylus guard and this step is now complete. If your turntable does not have an overhang guage, you will have to seek out an aftermarket alignment gauge or protractor.




Posted on Jun 30, 2009

  • SAM JAYANTH CHANDRASEKAR

    P-Mount
    Style

    P-Mount or T4P style tonearms are very easy
    to install cartridges into. The tonearm terminates in a square socket and will
    usually have a single screw on the right hand side. Remove the screw. Take the
    P-Mount cartridge and insert it into the mating tonearm socket. Be sure it is
    inserted all the way (The screw will not go in unless the cartridge is fully
    seated.) Insert the screw and tighten snug. Since P-mount cartridges and
    tonearms are designed to install with perfect alignment, there is no alignment
    procedure. This step is now complete.


    Cartridge Wiring
    If you have
    some DeoxIT or ProGold contact enhancer. apply it now to the cartridge pins.

    If you are using the Technics original head shell, you
    must open the connections slightly to make attachment easier or risk breaking
    them. If you look closely at the connectors at the end of each wire, you will
    see that they have a slot that runs the full length. Grasp the connector at its
    rear(where the wire is crimped) with the needle nose pliers, and push the screw
    driver blade into the opening just a little to widen the slot. Do this to all 4
    wire connectors.
    Now, select a wire, Grasp the connector at its rear(where
    the wire is crimped) with the needle nose pliers, and push it on to the
    cartridge's matching color connector. If there seems to be too much resistance,
    go through the spreading operation described above and open the connector up a
    little more. Attach the 4 wires and this step is complete.


    Tonearm Setup & Adjustment

    First, insert the headshell into the tonearm. Most tonearms use
    a bayonet pin style collar locking mechanism. The pin is on the headshell.
    insert the headshell, pin facing up, into the end of the tonearm. Holding the
    headshell in position with one hand, rotate the knurled collar nut on the back
    of the tone arm, and you should see the head shell being drawn into the
    tonearm. Tighten snug. (Note: never remove the rubber washer on the end of the
    headshell. it is important.).
    Locate the counterweight. Slip it onto the
    back of the tonearm and push it all the way forward. You should be able to read
    the counterweight dial scale from the front of the turntable
    Now,
    remove the stylus guard, and unlock the the
    tonearm from its rest.
    Holding the tonearm lightly against the rest with
    one hand, begin rotating the counter weight clockwise. The weight will be
    moving towards the rear. Keep checking the condition of the tonearm at the arm
    rest. You will reach a point where the tonearm just begins to lift off of the
    arm rest. STOP turning the counterweight, This is the
    Zero position..
    Now, lock the arm back down. Hold the chrome part of
    the counter weight with one hand and turn the dial scale to read zero. Friction
    coupling will keep the dial set properly.
    Now, turn only the chrome part of
    the weight counterclockwise until the scale reads the desired tracking
    force.

    Set the anti-skate setting to the same number as
    the tracking force.


    The Tonearm
    Height

    If your turntable has a tonearm height
    adjustment, set it this way.
    Place an old record on the turntable and cue
    the needle down in the center, It need not be turning.
    Now come down so that
    your eye is level with the platter. Sight the tonearm from the left or right
    side of the turntable. Does the tonearm wand appear parallel to the record? It
    must be to perform it's best. Make a note of the condition (too high, too low.)
    and adjust the tonearm height as required to achieve this condition.


    Finding The Best
    Location

    Few turntables made today have springy
    suspensions. Therefore today's tables are more sensitive to foot falls. The
    best location for a turnable is a wall mounted stand. This will eliminate
    problems from floor bound vibrations. Home centers have good wall shelf systems
    that work very well and are adjustable


    Connecting The Turntable
    The
    turntable will have a left signal wire, a right signal wire and a electrical
    ground wire. Connect these to your stereo or phono preamp. Connect the ground
    wire to the screw provided or, if no screw was provided, then loosen a chassi
    screw and use that. The ground wire is important in minimizing
    hum
    .
    I'm Hearing Alot Of
    Hum!

    This is the most common problem encountered
    with phono playback systems. And it can be puzzling sometimes to track down.
    First, you must isolate the source. Is it
    :



    • The Stereo


    • The Phono Preamp


    • The Turntable Wiring


    • The Phono Cartridge


    The
    Stereo

    Switch the stereo to CD or AUX, and
    with nothing playing, turn the volume up to your normal listening position. If
    there is no hum now, then we can eliminate the stereo. If there is a hum,
    powersupply service is probably indicated
    .

    The Phono
    Preamp

    This will require one accessory, a
    shorting plug. You need to get a couple of standard RCA plugs from Radio Shack
    for instance, and you need to short the center pin to the outside ground. Now,
    in place of the turntable, plug the shorting plugs into the phono input. Now,
    set the stereo to phono and turn the volume up to your normal listening
    position. If there is no hum now, then we can eliminate the phono preamp or
    phono stage. If there is a hum, phono stage service is indicated.


    The Turntable
    Wiring

    This will require one accessory. a pair of
    alligator clips. You can also get these at RS. You need to clip together, I.E.
    short out the left and right cartridge pins. Do this on the back of the
    cartridge. You needn't remove the cartridge connections. Just connect one pair
    of clips between the red and green pins and another between the white and blue
    pins. Now, set the stereo to phono and turn the volume up to your normal
    listening position. If the hum is gone now, then we can eliminate the turntable
    wiring. If there is a hum, something is amiss with the turntable wiring. either
    a bad connection. or perhaps someone has changed the factory wires for some
    "fancy" wires that do not give sufficient shielding.


    The Phono Cartridge
    If
    you've come this far, then the problem must be the phono cartridge.
    Most
    cartridges use hi permeability steel shells to protect the coils from
    electrical fields that can cause hum. However, not all companies use this
    system. As such , there are some cartridge brands that are sensitive to
    external electric fields and will hum. The only solution you have is to replace
    the offending cartridge. Or, if you love the sound and want to keep it, you
    will have to play with the location of the turntable and try to minimize hum.
    Sources of hum fields are power transformers in equipment, wiring in the walls,
    certain turntable drive motors. Experiment by listening to the hum while you
    move the tonearm through its arc(cued up!!) and see if you can find a null
    location that will give you the best results.



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