View Full Version : B&O 4002 arm wont lower


sweetlaraine
06-09-2008, 08:21 PM
Recently picked this table up. The arm does everything but lower. It moves smoothly from outer to inner groove, but when I push the button to have it move back to it's resting spot, it makes a squealing sound. It does move back tho, just the noise. Is it a belt? Or something more complicated? Thanks for any advice. Also, just for my own curiousity, the cartridge is a 4000. Decent?

asoundhound
06-09-2008, 08:59 PM
barring some mechanical issue with the transport mechanism, you may just need viscous fluid in the cueing cylinder. if you can find the manual for this tt, it may tell you what kind to use, how to, etc.
the noise may be caused by lack of lubricant on the transport mechanism. here the manual would help, too.

sweetlaraine
06-09-2008, 09:05 PM
barring some mechanical issue with the transport mechanism, you may just need viscous fluid in the cueing cylinder. if you can find the manual for this tt, it may tell you what kind to use, how to, etc.
the noise may be caused by lack of lubricant on the transport mechanism. here the manual would help, too.

Thanks for the info. I am off to track down a service manual. From your answer, I am assuming there are different types of fluid?

hakaplan
06-09-2008, 09:36 PM
This turntable uses a motor and pulley that requires a small belt to move the tonearm transport system. The belt is likely stretched out and needs replacement. Rarely do linear turntables use damping fluid. The cueing is usually motorized and replacing that belt might solve that problem, too. If you can't find an exact replacement, buy a bag of assorted small rubber bands and experiment until you find one that's just the right tension.

The 4000 is the predecessor to the MMC20EN, an excellent cartridge with a nude elliptical stylus.

sweetlaraine
06-09-2008, 09:43 PM
This turntable uses a motor and pulley that requires a small belt to move the tonearm transport system. The belt is likely stretched out and needs replacement. Rarely do linear turntables use damping fluid. The cueing is usually motorized and replacing that belt might solve that problem, too. If you can't find an exact replacement, buy a bag of assorted small rubber bands and experiment until you find one that's just the right tension.

The 4000 is the predecessor to the MMC20EN, an excellent cartridge with a nude elliptical stylus.

Do I need to pull bottom of turntable to access the belts? Or is there another area to access/ Thanks

resqguy
06-09-2008, 11:07 PM
You may want to do a search on B&O for more information.

To access the belts you need to remove the base plates. The plates come off by moving the trim pieces forward, then lift the plates off.

Look at the type number on the back on the unit and make sure your manual covers that model and type.

Tinman
06-10-2008, 01:38 PM
I think the arm lowering is actually done by a small solenoid.
Last one I fixed, the big capacitor that's attached to the base was dead. Without this capacitor, the solenoid does not have enough current to engage and stay engaged. Try looking at it, and as a test, jumper another capacitor across it. If the tonearm lowers, replace the cap. Hopefully the solenoid did not get burned. The only belts are for the platter, and the left-right motion of the tone arm.

Marc

sweetlaraine
08-12-2008, 08:24 PM
I think the arm lowering is actually done by a small solenoid.
Last one I fixed, the big capacitor that's attached to the base was dead. Without this capacitor, the solenoid does not have enough current to engage and stay engaged. Try looking at it, and as a test, jumper another capacitor across it. If the tonearm lowers, replace the cap. Hopefully the solenoid did not get burned. The only belts are for the platter, and the left-right motion of the tone arm.

Marc

Just got around to looking at the tt. I removed the top aluminum plate and platter. The arm still functions going left to right. When I press the lowering control, I hear a click and see the mechanism try to lower the arm. There is a copper colored device, and a brass looking device next to each other. The mechanism has 2 springs on it. When I press the lower control button, I see the lever try to lower the arm and hear the click at the same time. You mentioned a capacitor. Where is it located? And what does it look like? Do I need to remove any other parts of the table to see it? Thanks

pfcs49
08-13-2008, 10:49 PM
If it was an 800/8002 I could tell you but I think you'll get your answers here:

"To spare the rest of you BeoFans who own (or are considering owning) this magnificent turntable, most of the troubleshooting I had to go through, I have compiled this list of what mostly needs to be repaired on a unit with an unknown history.

http://forum.beoworld.org/forums/thread/94148.aspx

Beogram 6000 / 4002 ToneArm not lowering - Lubrication Points
Beogram 6000 / 4002 33/45 Speed Problem
Beogram 6000 / 4002 CD4 PCB Capacitor replacement
Beogram 6000 / 4002 prematurely ends play
Beogram 6000 / 4002 33/45 LED Indicator Upgrade
phil

sweetlaraine
08-14-2008, 12:03 AM
If it was an 800/8002 I could tell you but I think you'll get your answers here:

"To spare the rest of you BeoFans who own (or are considering owning) this magnificent turntable, most of the troubleshooting I had to go through, I have compiled this list of what mostly needs to be repaired on a unit with an unknown history.

http://forum.beoworld.org/forums/thread/94148.aspx

Beogram 6000 / 4002 ToneArm not lowering - Lubrication Points
Beogram 6000 / 4002 33/45 Speed Problem
Beogram 6000 / 4002 CD4 PCB Capacitor replacement
Beogram 6000 / 4002 prematurely ends play
Beogram 6000 / 4002 33/45 LED Indicator Upgrade
phil


Thanks. This sure makes it easier to pinpoint specific issues. I will let you know how it turns out. Much appreciated. :thmbsp:

sweetlaraine
08-18-2008, 10:38 PM
If it was an 800/8002 I could tell you but I think you'll get your answers here:

"To spare the rest of you BeoFans who own (or are considering owning) this magnificent turntable, most of the troubleshooting I had to go through, I have compiled this list of what mostly needs to be repaired on a unit with an unknown history.

http://forum.beoworld.org/forums/thread/94148.aspx

Beogram 6000 / 4002 ToneArm not lowering - Lubrication Points
Beogram 6000 / 4002 33/45 Speed Problem
Beogram 6000 / 4002 CD4 PCB Capacitor replacement
Beogram 6000 / 4002 prematurely ends play
Beogram 6000 / 4002 33/45 LED Indicator Upgrade
phil

Hi, Well I pulled the platter, and took a look under the hood. Your reference looks somewhat different. The board on yours is quite a bit larger, and the red cap is non existent on mine. Were these upgrades of yours? Also, sewing machine oil, only one type I assume? Once I can get the correct oil, if there are differences, I will try that 1st, then go from there. Thanks again for your help. Really appreciated :thmbsp:

pfcs49
08-19-2008, 07:22 PM
I, Phil, only know about 8000/8002 TTs.
That's a link to the beoworld.org group, to an archive about the 4002 series TTs. Join up-go there-and ask the experts.
Phil
PS: listen to Dillen

Tinman
08-20-2008, 08:19 PM
The 4002 should have a large can capacitor screwed to the base of the turntable. It's laying on it's side. That's the main filter and causes problems as well as the tone arm solenoid not staying engaged.

Oh, it's been a while, but you'll need to remove the platter and the covers anyway to service everything. Maybe you can take a pic and post it.