Today the problem has worsened. The arm will not move to the edge of the record to begin play. I have to send the arm back to rest by using the Stop button, but even then it doesn't go completely to rest and turn off. I have to give it a gentle push to the right to turn it off. So, not possible to play records now.

The turntable was serviced a few months ago by Analogique here in NYC but is out of warranty. They service B&O from back in the 1980s (or 1990s) and know the units. They lubed and went through the 4002 and it worked beautifully for a while until these new problems began. I hoped that I may be able to fix it myself, but...

I am not certain what you would like me to photograph or what exactly I should look for. Everything looks clean and in order inside to me. If you tell me specifics I will check and report back. If I can figure out how to post photos, I will do that too.

Thank you for your help and patience.
Brian

Did you try some more testing with the platters (and belt) completely removed so you can just observe the tangential arm activity?  The things to look for would be if the motor stops turning or the belt is slipping. Also checking for any squeaking sounds you heard before.

If nothing mechanical is causing the problem then it could well be electrical. I always exhaust the mechanical and connection trouble-shooting first. Are you the original owner or did you buy it used and had it serviced there in NYC? Do you know if any service on the Beogram involved the electronics? 

sonavor 

Hi Sonavor

The Analogique service was in August 2016, because the arm didn't move (it was a broken belt), and here is what was performed:
Replaced belts
Replaced lamp(s) and/or LED(s)
Replaced capacitor(s)
Traced located and repaired electronic problem(s)
Reconditioned and lube bearings/carriage/cam
Cleaned and lubricated as necessary
Tested and ran

I have owned the turntable since around 1990. The last service before 2016 was in 1997! At that time, Technetron in NYC did:
Replaced belt drive
Replaced arm belt
tip 141 transistor x2
tip 146 transistor x2
BC 156 (?) transistor
10 MF 16V cap (?)
Relay
The items with (?) are due to unclear handwriting. But perhaps this gives you an idea of some upgrades that may have happened.

I took all the platters off and can see what is a clear problem:

Sometimes the arm moves all the way along the path. Sometimes it gets stuck part way. Sometimes it gets stuck at the very end of the play or before returning to full rest.
When this happens, the pulley and belt for the arm is still spinning BUT the gold threaded shaft which turns with the pulley stops turning. This is when the squeakiing sound happens.

If I give it a nudge the shaft will begin turning again and the arm continues to move.

The belt on the arm pulley is new and appears to be tight. The pulley has two screws to the left of it which feel tight to me. The pulley also has a small hole on its right side, near the end of the shaft. There is nothing in this hole. Is that correct or should it have a small screw there.

When it gets stuck at what would be the end of the LP, the only thing that makes it return is to hit the stop button.The pulley seems to have some lateral movement on the shaft (left to right). When the pulley is hard left on the shaft, a very small amount of the shaft protrudes on the right. During the course of the arm moving, when it gets stuck (at this point the shaft stops spinning) the pulley seems to have shifted slightly to the right and there is no longer any shaft protruding. If I push the pulley to the left, the shaft and the arm begins to move again.

FYI, it had been suggested to lube the 4002 as a first try at fixing it. The threaded pulley shaft had some grease on it. As I didn't have grease, I used "Zoom Spout Oiler" Highest Quality Turbine Oil, paraffin based non-gumming (the same oil I used on the other lube points). Now there is really no grease on the shaft, only that oil. However, the arm was already getting stuck before I applied the oil. What type of grease should be on the shaft (which can be easily obtained)?

I took photos of all of these things but I don't know if they tell you much. I can try to upload them if they help you.

Thank you
Brian

bbrandt wrote:

When this happens, the pulley and belt for the arm is still spinning BUT the gold threaded shaft which turns with the pulley stops turning. This is when the squeakiing sound happens.

The pulley is loose on the gold threaded shaft. (missing screw ?)

The belt should not be tight but nearly loose to the feel of it, get a correct set of belts from member Dillen, 2016 original belt didnt exist and member Dillen is the only one we know to supply the correct ones

Hi Søren

The belt for the arm appears correct to me. The tension is as  you described. If I push down in the center, the belt compresses to almost the top of the shaft of the motor pulley post (sticking out of the black motor). Doesn't this sound correct?

What does look odd is that the belt has a slight twist to it when it goes around the black motor shaft/pulley). It is not absolutely flat, but it is flat on the big pulley wheel. Is this correct?

I will purchase a belt from Dillen if needed. Just want your opinions first.

Brian

bbrandt wrote:

I will purchase a belt from Dillen if needed. Just want your opinions first.

Brian

Doesnt sound right, the belt on my BG 4002 is a square profile belt (still original I think). Dillen didnt have the belt for the arm drive when I restored mine so I left the original there, it is very loose but working properly.

The correct belts are essential to these decks, specially the platter belt, too loose and it will slip, too tight and it will destroy the motor bearings and pull the platter out of center position.

Did you check the spindle pulley ?

The original belt was triangular in cross section. If you replace with a belt with square cross section it will appear to be twisted in use.

Not sure what Dillen is supplying now but you can bet it will be better than anybody else can supply.

The belt must not be too tight and,will probably appear to be loose for best results.

Pulleys are fixed to the shafts with grub screws but over the years the threaded hole will have cracked, preventing a tight fit. Some years ago, a member was producing replacement pulleys with a 3D printer. Health problems prevent me remembering which member it was. Suggest search the archived forum.

Down towards the bottom of this page you can see some pictures of a replacement pulley for the Beogram 400x turntables. The pulley is slightly different for the Beogram 4000. Beoworld member Nick makes them. Machined metal and they work great. A lot, if not most, of the Beogram 400x plastic pulleys are cracked. Some get slightly warped. Even with a new pulley you will want to get a proper belt from Dillen though.

All of that being said, I'm not sure that will correct your issues judging from your last post on what you observed with the platters removed. If the Start and Stop always work fine then it sounds like the motor is driving the tangential arm assembly okay. The part about it not detecting the SO (stop) point sounds like it could be the position sensor. 

Your Beogram problem doesn't sound like a lubrication problem to me. Since you had an expert shop adjust it just a few months back a lubrication service should not be needed again. I read where they did change out capacitors and other electrical components so they essentially did a restoration on your Beogram. To me that points now to some component failing related to the position detection. You should still check the pulley and belt as suggested buy I think the noise problem you are hearing is because the Beogram is trying to drive the tangential arm assembly past where it should.

I would be inclined to take it back to your repair shop and demonstrate the problem to them. 

sonavor 

Read this John

When this happens, the pulley and belt for the arm is still spinning BUT the gold threaded shaft which turns with the pulley stops turning. This is when the squeakiing sound happens.

Right Søren. That sounds like the motor is still getting a command to drive but the limit of travel is exhausted. The control logic should have initiated a stop and return. That wouldn't be good long term for the parts involved either :(