Problem with Beogram 4002 Type 5521

[Mark-sf]

Paul, we appear to have a language issue as I don’t understand what you mean by “plugging in the tray into a 20-Volt outlet”.  There are no IR diodes in this model as the end fixed arm light logo and the tonearm movement optical shutter all use incandescent bulbs.

I previously asked you to perform specific tests which you have not reported on and I need this info to assist further. If after plugging into the wall and pressing Start nothing happens, then you may have blown a fuse which is located in the back right hand corner in a black plastic box.

You have done things to the table that are totally unnecessary such as removing the control panel and its PC board and the result can be breaking something. It is also easy to misalign the board connectors and cause problems. How much experience do you have working on electronics and reading and understanding circuit diagrams?

[Paul Mac]

Hi Sr. When I refer to connecting the turntable, I mean 220 volts (mains). Secondly, the turntable does absolutely nothing and has no blown fuses. And the sensor light behind the transparent ruler is an IR LED, it’s categorical. I sent you a photo of that LED; it’s not incandescent, except for the optical shutter light for the arm movement. Regarding removing the control panel and its circuit board, I work with a grounded static discharge wristband, and I specialize in electronic repair of laptop computers. Audio isn’t my specialty, but there’s no one in Argentina who understands this brand of turntable. I repeat, the turntable does absolutely nothing when plugged into the mains. And there are no blown fuses. I’m attaching a photo of the IR LED. It’s not incandescent. I already tested it with 1.5 volts, and I can only see whether it lights up or not with an infrared lens. Finally, you insist there’s no infrared LED. I’ll prove it to you. I’ve already identified the circuit. Please see the circuit in the attached photo. Sincerely.

P.D.: My model, unlike yours, has an IR sensor, not a fluorescent one.
I’m attaching a photo of the IR LED. It’s not incandescent. I already tested it with 1.5 volts, and I can only see whether it lights up or not with an infrared lens. That said, please tell me how I proceed from here. Do you have a flowchart?”

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

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[Paul Mac]

Mark-sf wrote:

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?

          When I press the Start key absolutely nothing happens, whether I press it once and release it or if I keep it constantly pressed.

[Mark-sf]

Paul, yes the LED you posted in the second picture is an OP160 IR LED; however, I was addressing the Beolover picture that you posted earlier and the visibly lit areas.  This LED however, is not the source of your problem. If you are not getting any response from pressing Start then you are likely not getting 1TR1 turning on 0TR1 so that 22v is sent to activate the arm motor circuit. If you are looking for a troubleshooting flowchart, you can upgrade your membership to Silver and get access to the 4002 service manual which has that chart.

[Paul Mac]

Hi, thanks for the info. I have the diagram for my equipment, and I found transistor 1TR1, but I still haven’t found 0TR1. This is the diagram I have for the Beogram 4002 5521.

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[Dillen]

The “0” in 0TR1 suggest it is NOT fitted on a PCB.
It sits at the bottom of the Beogram.

The speed issues could be down to a faulty relay or trimmer.

But please consider if you are the right person to do this repair /these repairs.
You seem to be lacking experience and you seem to be guessing, neither of which will help.
Not performing the steps and diagnostic suggestions provided only adds to the mess.
With all respect, and I mean this in the best of ways. It’s not an easy unit to service, and definitely not one for a beginner.
You’ve already caused several problems that weren’t there when you started.

Martin

[Paul Mac]

We agree that I’m not the right person to repair it, nor that it’s a simple tray to repair, but there’s no one here who wants to do it, so what do I do, throw it away…? On the other hand, I respectfully disagree that it caused any problems since I lubricated it in accordance with the technical service manual and with the appropriate products. I was also right that this sensor was an IR type and not an incandescent one. Furthermore, when you tell me: “1TR1 turning on 0TR1 so that 22V is sent to activate the arm motor circuit,” in reality, according to the diagram, it’s 22 volts. Your model is different from mine. The problem was always the same; there were no other problems caused by my intervention. I’m sorry for the inconvenience and thank you for your time.

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

[Mark-sf]

As Dillen replied 0TRi is mounted on a metal block heat sink screwed to the bottom and connected to the board on the solder-side. You can easily measure the voltage across it while pressing the start button to see whether it is passing 22V which is shorthand for “22 volts”.  This is my last message to you on this as your combative responses and insistence that you did nothing to cause this non-operation are preventing a successful diagnosis and my help.

[Paul Mac]

Thank You!.

[Dillen]

Well, perhaps it wasn’t because you lubricated something but, apparently, “something” happened while you did it.

And of course it can be repaired. They can all be repaired. None of these should be thrown away.

Your Beogram is welcome here – but, based on your IP location, Denmark could be a little too far away from you, and I’m sure there must be someone closer capable of repairing this.
Try posting a new thread asking for a repairer and state where you are based.

Martin

• This reply was modified 2 weeks, 5 days ago by Dillen.

[Paul Mac]

Hello Dillen. First of all, thank you for your response. Yes, I am in Argentina and sending it there is not profitable for me. And as you mentioned, something happened during the lubrication I performed, probably malpractice on my part. I found a person on Google with the same problem and they attribute it to a couple of transistors that control the voltage to the main motor and the small belt of the displacement mechanism, so I will try to check the circuit and continue looking for a solution. And also a competent technician here from that brand. Very kind!

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