ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
When the tone arm on my 4004 Player gets to about the 2nd track (approx) it starts to "WOW" speed variation - when it gets to the next rack it is OK. I have lightly lubricated the threaded rods and the smooth rods with no affect. The Tracking adjust appears to have no effect on the problem?
Any body with a previous history or knowledge would be much appreciated.
Hi Christopher,
There are two known issues, speed relay and speed control pots above deck. I suggest you do a search and you will find heaps of information to help you out. Search for Beogram 4002 rather than 4004 as most own a 4002 which is almost the same deck.
Drew
The carriage movement has no influence on the platter speed.
Check the condition of the platter belt - replace if in doubt.Check the speed setting trimmers on the main board and excersize the fingerwheel trimmers on the panel a bit.Check the condition of the relay contacts - replace if in doubt.If the DC motor version, take the platter motor apart, clean and relubricate the bearings.
These are - by far - the most common causes for wow in these decks.
Martin
Thank you Martin,
I did replace the platter belt on the 4004 -I will try working the trimmer pots-I didn't think of dirty contacts on the pots ! How difficult is it to replace the relays and how do I access them.
By the way I ended up finding another BM 2400 in perfect working order having to give up the one you sent me the new capacitors for after the technicians blew it up while trying to change them out and the next shop estimated $450.00 to repair-instead I found a really nice example for $200.00 and I love it- now if I can get the turntable working, I can be happy playing our collection of over 300 vinyls and I might even start collecting more-thanks as always for your help.
Thanks Drew,
The strange symptom is that the wow occurs only for a few moments at a particular spot on the records -it is fine before and after. Martin suggested a new Platter belt which I have already done and working the speed adjustment pots in case their contacts are dirty-no luck on either change. He has suggested that the "relay" contacts may be dirty or bad and cleaning or changing out the relays but I think that may be above my pay grade!
Cheers Christopher
The strange symptom is that the wow occurs only for a few moments at a particular spot on the records -it is fine before and after. I had already as suggested tried a new Platter belt which I have already done and working the speed adjustment pots in case their contacts are dirty-no luck on either change. Your suggestion that the "relay" contacts may be dirty or bad and cleaning or changing out the relays is appreciated but I think that may be above my pay grade!
Cheers Chris
Once I had a strange wow effect on a BG7000 (I know different record player, chassis etc).
This one once and a while changed speed for no reason. After inspecting the trim potties and the relay, it seemed that a (good measured) capacitor had a broken joint. Hardly visible and after checking it's value nothing seemed to be strange or bad. The solder joint of this powersupply capacitor even looked good. But at a closer look, you could see that the positive lead in the middle (it has 3 minus "leads") moved freely along the solder joint.
Thanks Beobuddy,
Did it always occur at the same spot (on the records? That is what is puzzling me. It would appear that the physical position of the arm has some correlation to the WOW and I can't conceive how the cause would be from a component ?
Chris,
A wow/flutter problem usually is caused by variations in platter rotation. Pull your platter off and remove the sub-platter. Is there lubrication on the bearing. Check for scoring on the bearing shaft. Also check for play in the bearing. I have seen a number of 4000 series tables with dry/damaged bearings.
Let me know what you find.
Tom
Thanks Tom - I checked The bronze bushing looks fine- the platter shaft looks fine- I put a spot of sewing machine oil but unfortunately I still have the problem when the arm is in that area.
Chris