[Mark-sf]

Faced with the two options, I would definitely go with the new MMC4 which has a nude elliptical stylus versus the rebuilt MMC5 that has a bonded diamond. The 4 has less mass to resolve more detail and track better.

• This reply was modified 1 day, 3 hours ago by Mark-sf.

[Mark-sf]

Great progress! As to you hum issue, this is most likely the wrong DIN cable adaptor. Since the table has a DIN socket, unless you are connecting DIN->DIN you need a DIN-RCA that has an additional chassis ground wire designed for turntable outputs.

[Mark-sf]

Welcome to the forum! You really cannot evaluate the stylus with a jewelers loop and given that the cartridge is about 45 years old, even if it was in unplayed condition, the suspension would have aged to become the issue. That cartridge was never sold with that model and was a previous generation, so it may have been used when added to that turntable. As to lubrication, that would be centered around the motor bearings as to whether the infused oil has dried out. Once you get a belt, I would test with a record that you are not concerned about damaging. A good dealer may have a stereo microscope to examine the stylus wear. Test records can determine the state of the suspension and motor bearings.

[Mark-sf]

Alf, it’s important that the pulley is fully counter clockwise against its stoop before mounting the cord. If that is the case then you can manually check its movement by first unplugging it and the push the cam’s toothed bar toward the front and rotate the swing ring counter clockwise to rotate the cam and check its movement.

[Mark-sf]

I would set the tracking force to zero, remove the arm cover and ensure the arm floats with no friction up to down. If it doesn’t you have found your issue and need to find where it is binding. Sometimes its the cover, tonearm wires too tight, sticky bearing, etc.

[Mark-sf]

Emma, you’re welcome. Enjoy with your new addition!

[Mark-sf]

I would check that if you manually lower the arm before the edge of the record that it goes down to just above the top plate. I would also check the tracking force calibration.

[Mark-sf]

Most of the time with these models it is an issue with the ribbon cables between the main board and the other ones including the keypad. I would carefully reflow all of the connections on each cable end. I would also check if your 2MHz clock is running on Pin 11 of IC1.

[Mark-sf]

Emma Kitley wrote:

In the first instance I have bought a new DIN to RCA cable from Sounds Heavenly as it does seem that B&O pins are wired differently – fingers crossed this works… will keep you posted!

Thanks so much again, Emma

Emma, if you get sound but have a hum using the Sounds Heavenly cable, return it and get one that has a separate ground wire that you connect to the thumb screw on your phono preamp. I included an example in my previous reply.

[Mark-sf]

You need a Phono DIN adapter cable to go into your preamp such as this one: https://www.av-connection.com/?PNo=AV-DINPHONO&gad_source=1. The one you’re using is likely connected to the wrong pins and also needs the ground wire.

[Mark-sf]

On a turntable that old, if its motor is not turning then the grease has hardened and bearings dried out. You never posted what is actually not working.

[Mark-sf]

That is simply a chassis ground.

[Mark-sf]

I’m not sure which wire you believe is totally missing. If you are referring to the Red/Black twisted pair in the first picture that appears unconnected, that is normal for 1000’s not equipped with a phono PC board. Yours simply has the jumper board that directly connects the tonearm cable to the output cables which then go into a preamp’s phono inputs. What is actually not working?

[Mark-sf]

That capacitor is not your problem. You say you don’t have voltage at the 01C1 5V regulator. Does this mean that you measure 0V at both its input and output? If that is the case can you check the continuity of the F1 fuse? If it is good that means you have no output out of the diode bridge and its supporting capacitors.  That’s where I would focus.

[Mark-sf]

You need to adjust the aperture (B) so that the arm moves every 2 revolutions. Make sure that stray light does not leak in when doing it.

[Mark-sf]

Your problem is not simply the knob. That amount of damage would have destroyed the arm bearing so that even if you could get the knob in the arm would damage records.

[Mark-sf]

Thanks for the pictures. I’m afraid that level of tonearm bearing damage is not repairable.. You will need to replace the tonearm to restore the turntable. Many of these have bad motors so you may find one for parts that you can use its tonearm.

[Mark-sf]

Dieter, I’m not following your description. Assuming you have a 1200, the rear counterweight when screwed fully in is factory to the tracking force as there was no user adjustment on that model. Perhaps you can post a picture.

[Mark-sf]

Looks like someone did a nice hack job. Here is a link to a picture with all the wires on the correct pads: https://archivedforum2.beoworld.org/cfs-filesystemfile.ashx/__key/CommunityServer.Components.PostAttachments/00.00.12.47.75/bg8000_5F00_din_5F00_pcb_5F00_01.jpg

[Mark-sf]

You need to connect the black lead to a chassis ground which is available many places. For example, the negative terminal of C24 or C27.

[Author]

Posts