Problem with Beogram 4002 Type 5521

[Paul Mac]

I purchased this turntable, which worked, but the belt wasn’t original. While waiting to buy it, I decided to lubricate the threaded shaft and the rear steel shaft of the shifting mechanism. After that, every time I press the Start key, it doesn’t stay on, and therefore the turntable doesn’t work. If I move the carriage by hand toward the center of the turntable, it works. When I press the Stop key, the carriage moves to the rest position, and I can no longer get it to work properly. Thank you very much!

[hcraig244]

Its unlikely that lubricating the carriage drive screw and associated wheel would cause the problems you describe, I would take a close look at the carriage position sensor and ensure it hasn’t become detached or damaged..see the attached blog from the beolover….his issue was different to yours but i suspect it could be related…send some pics of your unit for us to view

https://beolover.blogspot.com/2016/04/beogram-4002-5513-non-working-end-groove-detection.html

[Paul Mac]

First of all, thank you for your response. The IR diode has the correct voltage, 1.1 volts, and the receiver has 5 volts at the collector and 0.7 volts at the output.

• This reply was modified 3 weeks, 6 days ago by Paul Mac.

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[Paul Mac]

I unsoldered the IR diode and tested it with my cell phone’s camera, and it works. And the receiver didn’t move at all (I think).

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[Mark-sf]

It sounds to me like the servo belt is slipping due to wear or the pulley’s lock screw support is cracked. You can also have this problem is the threaded rod is not parallel with he supporting rods.

• This reply was modified 3 weeks, 5 days ago by Mark-sf.

[hcraig244]

Ok…..when you press start does the turn table rotate?…..also as Mark suggests does the transport motor drive with the belt removed, if so this would prove a fair amount of the unit is operational….hopefully it is an issue withthe belt slipping as this will be an easy fix for you…

Craig

[Paul Mac]

Thanks for your reply. The drive belt for the scroll motor is new and the motor works perfectly. and the threaded shaft is parallel and has not suffered any impact in such a way that it could have been damaged.

[Paul Mac]

Thanks for your reply. The engine runs at both 33 and 45 volts, and the drive motor runs normally without the belt, and it does with the (new) belt.

[Mark-sf]

When you press start, the inward movement of the tonearm activates a switch on the slide PC board that causes it to remain on. If that is not happening you will get that problem. If you keep holding the Start button, does the arm advance to the middle as long as you hold it as it should?

[Paul Mac]

Now, another problem: if I move the tangential arm by turning the motor by hand, I can raise and lower the arm. The Start works at 45 RPM, but not at 33 RPM, which controls that speed?. I took out the Transistor TIP120 and TIP125 RPM models and checked them with a tester, and they were fine.

• This reply was modified 3 weeks, 4 days ago by Paul Mac.

[hcraig244]

I dont understand that last post?

[Paul Mac]

Good morning. I clarify my last post. Now, when I plug the turntable into a power outlet, the speed control and rear sensor lights come on. If I set the speed to 33 RPM, it makes half a turn and stops, but if I set it to 45 RPM, the motor spins. Without the metal covers, I press the Stop key; the motor (without the belt) that moves the tangential tone arm spins. If I press Start, does it stop? With the belt in place, it doesn’t move, as if the threaded bronze shaft were stuck to the right, like it’s locked. However, if I insert the covers and set the turntable to play a record, the Start function doesn’t activate, nor do the right-left arrow keys. I do press the key to raise and lower the tone arm. I don’t know which component controls the speed, because only the motor works at 45 RPM, not 33 RPM. Try recording a video.

• This reply was modified 3 weeks, 4 days ago by Paul Mac.

[hcraig244]

Ok….I dont have a manual for the type 5521, however the image you posted of the 5513 position sensor suggest to me that it may be very similar….the speed control is via 1RL1

[Paul Mac]

Hellow hcraig244. I have it, and I also made a video. I’ll review what you mentioned in the diagram. Thanks for your input.

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[Mark-sf]

You have multiple issues which is making troubleshooting this online very difficult.

First Problem: Plugging in the turntable should NOT cause any lights to turn on on motors to run. Since the 33 one is that means that the SO switch is not making proper contact. Either the switch’s spring has come off or the slide is not causing it to close at its rest position.

Second Problem: Missing Servo Belt: The belt that drives the threaded shaft is not installed and needs to be to properly test the arm movement. Once this is installed then my question above about pressing and holding Start is relevant.

Lets get this working first before removing any parts or making adjustments.

[Paul Mac]

The servo belt is installed and is new. I probably removed it to take the photo. Secondly, the switch that controls 33 or 45 is working fine, and there’s continuity to the connector. Second, could someone tell me what powers the motor at 33 RPM? I’m not referring to the preset or the switch; it must be a transistor or some other component, because at 45 RPM, 3.34 VDC reaches the motor connector, but when I switch to 33 RPM, there’s no voltage. Thanks.

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[Mark-sf]

 

Paul, not sure why you are ignoring my troubleshooting questions. You’ve come here for help and collectively we have decades of experience; however, from what you have posted you are not approaching this systematically.  We are trying to guide you by establishing a functional baseline – thus the questions.

Per the manual, there is a relay that switches between speeds based upon either the control panel switch or an optical pulse generated by the tonearm carriage position.

• This reply was modified 3 weeks, 2 days ago by Mark-sf.

[Paul Mac]

Every time I plug the gearbox into the mains, a new problem appears. Now, no lights come on, either on the gearshift panel or the sensor. And regarding what you mentioned in your answer 69123, the relay that switches between 33 and 45 RPM may not be working properly, as it only switches at 45, not at 33. That said, and since there’s no one in Argentina who can repair my gearbox, how can we proceed with troubleshooting my gearbox? If you have a diagram, please let me know, and I’ll follow it step by step. I’m sorry for wasting your time…

[Mark-sf]

Paul, in your first post you stated that you just purchased this turntable and it worked until you began taking it apart and lubricating it. Can you please confirm the details as to what worked on it and how you reached that connclusion.

NEXT, as I have stated earlier, no lights should be coming on when you plug the turntable in. On that model nothing should happen until you press the Start button. If you Press and Hold the Start button the arm should move to the center of the table and then reverse and come back. During that process the platter speed will change from 33 to 45. Please put all the belts and platters on and perform this test and report back the specifics of how it behaves.

NEXT put on a record and Press and Release the start button. Report if and where to the arm moves, does the turntable spin and at which speed, and whether the arm lowers.

With the above information, we can begin giving you meaningful directions.

 

[Paul Mac]

Good morning, Mark. When I bought it, it worked fine, except the belt wasn’t the right one, so I cut and glued it to size while I shopped for the original on eBay. In the meantime, I moved the carriage that moves the arm from the motor until I discovered the threaded bronze shaft and the rear steel shaft. That’s all I did. Now it doesn’t do anything at all. I re-welded some of the wires, and no lights come on anymore when I plug the tray into a 20-volt outlet. Another question, the light seen in this photo, does it come from the tangential adjustment arm or from the IR diode 4D1…?

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