[Mark-sf]

First I would double check that All of the replaced capacitors are in the correct polarity. After plugging in, you should see a red dot in the display. If you are not getting that I would check that you have 5VDC at pin P6-1 which is powering the CPU, then work backwards to the Zener and regulator.

[Mark-sf]

It appears that the arm is being blocked from moving inward once it lowers. I would check with it open and lowering the arm to the right of the platter. It should move freely the 1/2 inch to the sensor arm. Sometimes the optical shutter is sticking or has be rotated so it hits its stop prematurely.

[Mark-sf]

The Beogram 1500 was one of the first tables and had a lift off dust cover. That looks like the rear hinge assemble to a 1900. This is how they go together.

 

 

[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.

[Mark-sf]

There is no harm in adding that jumper as it is simply connecting two ground points together. These boards being single-sided used jumpers all over the place to connect grounds together.

[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.

[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?

[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.

 

[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.

[Mark-sf]

I’d start with replacing C17 as that is too much ripple for a 13vDC line. Are the diodes mounted above the the board? If not then that heat is not normal. How much power is the who player drawing when playing? It should be no more that 20-25W.

[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.

[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?

[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.

[Mark-sf]

I don’t believe so. The stylus on an SP14 includes the outer shell as an integral part of it.

[Mark-sf]

The SP1&2 used a different stylus replacement form from later modeis. One source is https://www.dacapoaudio.com/908-bang-olufsen-sp-1-sp-2.html.

[Mark-sf]

Lucy, welcome. Your turntable is over 50 years old and likely needs at least a new stylus and a stereo amplifier or receiver that has a Phono input or a separate phono preamplifier to connect to the former. To find service possibilities, you’ll need to share your location as that model was sold globally.

[Mark-sf]

I am not familiar with the Armando; however, CAT7 cable is not intended for analog audio use even when it’s shielded. Frequently, a hum issue will be the result of either a coupling problem due to proximity of AC mains lines when run with the CAT7 in the walls or a ground differential issue or loop between where your turntable is plugged in than your system across the room.  Since the RIAA amplifier in the 7000 is not a balanced output there is no common mode rejection along the signal run. I would approach determining which type of hum you have by running a CAT7 cable across the room in lieu of you in wall set up. If the hum goes away you have in-wall coupling which may be mitigated by using isolation line transformers to convert your single ended connection to balanced on bot sides.  If the hum is sill there you then have an AC mains grounding issue, and you need to disconnect the grounded shield from the Almando end. You also might try reversing the mains plug on one side if its a 2-prong one.

[Mark-sf]

Craig, thanks for the kind words. Here is a photo of one with the Grado Signature. I would also replace the tonearm wiring with silver wire and the phono leads with Varian Audio cables. Finally, there was an optional PhonoAmp board that replaced the muting one with an onboard DC-DC power supply to give it +/-15V.

[Mark-sf]

What you have is the packing box of the cartridge that would come when it was included with the turntable. They provided specific models with specific turntables. The retail packaging for the cartridge was much larger and had the model on it. This cartridge is upside down hiding its model and the cantilever looks skewed, so I would avoid.

[Mark-sf]

Nebojsa is correct. I was a B&O dealer back then.

[Author]

Posts