I have now swapped out my MMC20EN from my 4002 and that does the same. The stylus 'swings' from 17:00 to 19:00 as the arm tracks. At certain points in the record, the record(s) gets stuck.

I put the MMC20E in the 4002 and it does not 'swing' . The 'sticking' must therefore be something to do with the left/right swing of the arm. No records mis -track

Any information would be greatly appreciated.

Does the tonearm swing freely or does it have a sticky feel?
Perhaps it was once lubricated with something bad.

Martin

Hi Martin,

Thank you for the reply.

It seems to be free but obviously something isn't right. It would not take much to prevent the arm from moving.

It appears as if the arm is standing still until the record revolves a few times, bends the stylus to the point where the arm overcomes its inertia and swings across to catch up.

Could it be anything to do with the clutch mechanism at the base of the arm near the anti skate? I don't really understand what that clutch mechanism is for.

(PS do you still have the 24V bulbs for the 4002 speed selector/ arm? If so please send a PM with details)

The saga continues. 

Disappointingly, there is no real difference. Some records still get stuck, others play fine. It can be anywhere on the record but seems to get worse as the arm moves to the centre.

I disassembled the arm, cleaned all 13 ball bearings - 3 on top an 10 below and everything around. I don't recommend this!

I would like to check I have re-assembled the bearing correctly as the manual isn't clear to me.

The attached picture shows the top of the arm mount. You can see the centre spindle is not round (looks like it was done in the factory) so you cannot remove the brass washer under the E clip to totally disassemble the arm. Under the brass washer is a plastic retainer with 3 recesses which hold the 3 top ball bearings. It looks as if the bearings should sit under the plastic piece, which is where I have put them. Can anyone confirm this?

Any other thoughts on why the arm should stick  would be appreciated.