Yes first check is that the Gnd wire from your turntable is connected to the Gnd (ground) post at the back of your amplifier with a good clean tight connection. If the problem persists, check ALL your hi-fi components mains plugs for earth connections including your turntable, then remove the earth connections on all but one component so that you are left with only item earthed. What does sometimes cause problems is if 2 or more hi-fi separates are earthed and connected to each other the earth cables along with the hi-fi interconnects form an inductive loop that picks up interferance such as mains hum etc. Regards John
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When the turntable plays, do you get a howling bass heavy sound? Have you tried turning down the volume and bass? If that corrects the problem, you have what's known as Acoustic Feedback. Check to make sure the tonearm is properly set up first. If it is, please visit my website at Audioserviceclinic.com. You may contact me there. Thank you.
When the turntable spins the light shines on the edge. You will see at least two indications. One for 45 and one for 33. With the record playing you should adjust the speed control, till one of the indents appears static and not moving. You will have to do this for both speeds. You also might see some varations in speed. These are quite normal and getting it right is trial and error. It will only read true when the stylus is on the record too. If you can't get the indication to stay still then there is something wrong with the drive.
If the player has a MD/MC pickup head, you need to use an input suitable for MD/MC (Magneto Dynamic/Moving Coil). If that is not available, you need to buy a standalone phono pre-amp (pre-amplifier with RIAA-correction curve). Like the TCC TC-400G/L. Example: See HERE and some info HERE.
I suppose the only way to do it would be to stop it functioning completely. The only way would be to dissasemble the auto function. What you would need to do is work out which parts are essential for the turntable operation and which only activate the return. So you need to whatch the mechanism working. You will need to remove the base and look at from underneath, just like going underneath a car!
I can't say for certain if you can do it, only you will be able to determine it can be removed without affecting the operation of the entire turntable.
on page 8 of the above service manual for your model it shows 4 electrical switches that tell the computer what 'state' the mechanism is in at any given time. Either one or more of the switches are intermittant or the mechanism has dried up grease that is slowing down the operation and basically gumming up the works. the old grease would have to be removed and replaced when it is causing binding. The switch just to the right of where is says "microswitch ksf-023" is an 'open air' type and so would be the most likely suspect. it simply needs to be cleaned with a super fine file designed only for cleaning switch contacts. THIS SERVICE SHOULD ONLY BE PERFORMED BY QUALIFIED PERSONNEL ONLY!!!!!