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The interesting video is the one where you (should be able to) see the belt running its path.
“when I play without a record it only spins for a couple of seconds.”
That’s normal. It won’t play without a record but needs to spin the platter to check for one.Martin
For the white leads going to the transformer it doesn’t matter which one sits left or right.
Martin
Did you try the method stated in the service manual?
Martin
The motor runs all the time, when the Beocord is out of standby.
Martin
Could be the safety circuit kicking in. It kicks in if the motor is loaded abnormally.
This can happen, if something has seized or running rough in the mech. or if the belts are not correct (too thick or too tight).
– Ebay belts?Martin
That depends on the territory version, as some have polarized mains plugs and capacitive
decoupling to chassis in accordance with local regulations.If your mains plug can be plugged into the wall outlet any side up, it’s safe to swap the leads.
If you have a three-prong mains plug that cannot be reversed, or your mains plug for
some other reason can only be plugged in one way, you should keep the mains leads in their original positions.Martin
In test-mode press 7 to delete RAM settings and revert to defaults.
Service manual page 7-2 and 7-3 describes it.Martin
Where in the world, apprx.?
The interesting video is the bad one. I simply can’t see if the belt scrapes on something
– or the motor pulley, it can also scrape on the motors metal bracket (bad motor mounts).Martin
The scraping sound could come from the belt rubbing on something.
If you run the deck without the platter, the belt could run on the subplatter flange.Or it could be from the record sensing mech.
Have you tried with a record on the platter?Martin
The three locks must be rotated a little using a wide-bladed screwdriver, enough to allow
the subplatter to pass.
They will usually move in “loud chunks”.The belt will come off, and you may have to take off the black plastic surround to get at the
motor pulley to put it back (renew it and the motor mounts while in there).Martin
The “skeleton” sub-platter can be lifted off.
That would ease inspection.Martin
I looked through my notes, and I don’t have the measurements anylonger, but I
do remember my surprise experiencing the huge difference from foam to rubber, and
I also remember that the driver that was restored with foam was closer to the
(same) driver with original, old but intact surround than ones that were restored with rubber.Another thing is, that the glue often supplied with new rubber surrounds usually won’t hold for very long.
It just doesn’t grip very well and, even after several weeks/months, you can often peel
the surrounds off again completely intact with no remains of glue sticking to them.
Most rubber surrounds are rubbish when it comes to finding a suitable glue (read: that is commercially available and not toxic).Martin
Does the relay make an audible click when the Beomaster goes in and out of standby?
Martin
Has the center bearing come lose from the base plate?
Martin
Sorry, I didn’t keep the numbers.
It was several years ago, but it should be easy to replicate for someone with time and means.Martin
Compare the T/S parameters of a driver restored with foam to one restored with rubber (both played in to losen up the stiff new surrounds), and you will no longer
have any doubts.I did exactly that.
I was expecting a difference but… oh dear, was I surprised.Foam!
Martin
Where’s that? Can’t for the life of me find a supplier in Belgium. Only option seems the be the one seller on eBay who charges 60 euros a piece now
Not in Belgium, though.
Martin
I would check
-Power supply ripple (bad filter capacitors).
-DC on a speaker output (bad differentiel amplifier stage).
-Idle current trimmer(s) bad.In that order.
Martin
Could be.
Or the supplied power is not clean, making the processor run unpredictable.Martin
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