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
The tone arm moves across but will not lower onto the record. How do I fix this?
It is difficult to advise without actually seeing the problem. The Beogram 4000 has a lot of sensor switches and a logic circuit to determine set down position and other various functions. You will have to go through those from the service manual and debug where specifically your problem is.
-sonavor
I have basic electrical knowledge.
Do i go through all the resistors, capacitors and transistors with a multimeter and find which is faulty?
If it has been some time since it has been used, it could be a lubrication issue!
There are a number of bearings involved in the arm drop procedure which have a habit of drying out and effectively seizing up. If you hear the solenoid click at the appropriate time, but no drop, lack of lubrication will be the issue.
Regards Graham
G7Trader: I have basic electrical knowledge. Do i go through all the resistors, capacitors and transistors with a multimeter and find which is faulty?
No!You can't repair anything like that. You will only risk introducing more faults, which would make it more difficult to repair.If the tonearm doesn't stop at the lead-in groove, it's because the deck doesn't recognize the record.This is typically a switch problem or a fault in the logic ICs.
If the tonearm stops over the lead-in groove, (it has recognized the record), but won't lower, it's typically a problemwith the mechanics related to the solenoid, lift/lower arms etc. and the damper. If the solenoid is never powered, it could bea problem with the power change switch on the carriage and/or the solenoid driver circuit, the solenoid itself or controlling logic.
Look at the schematics and in the deck.Learn and understand how the deck is supposed to work and find out which part of the deck and/or which part of its circuits is at fault.Measure voltages and signals in the circuits related to the problem, compare them to the manual and what you would expect.Diagnose and repair.Just like any other repair to any other electronic thing.
Beogram 4000 is a somewhat complicated beast and definitely not good for a beginner.Not helped in any way by the fact that all of these decks need a very thorough restoration by now (if not already done), ratherthan a few discrete repairs.
Martin
Dillen: Beogram 4000 is a somewhat complicated beast and definitely not good for a beginner.Not helped in any way by the fact that all of these decks need a very thorough restoration by now (if not already done), ratherthan a few discrete repairs. Martin
The above statement cannot be emphasized enough. I see so many vintage audio components that are this old that people seem to think just need a tweak here or there or some oil here and there. The fact is these electromechanical machines need full servicing. They are great turntables so you are fortunate to own one. Now put in the necessary work to make it new again. As Martin said, these are not units that you want to learn turntable restoration on. The adjustments that need to be made are many and one adjustment can affect another.
If your goal is to learn how to restore vintage B&O audio components then by all means, welcome to the club. There are people on the forum that will help but be prepared to put in the time and invest in proper tools. However, start on some easier components like a small amplifier or receiver. Something with a lot less moving parts. If you are just trying to save money on an expensive restoration then I understand but it is what it is. A complicated machine and it requires a lot of work.
sonavor