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
Thanks to Dillen, Solderon, Saint Begrowler and Rudy from Beolover for assisting in getting me to this stage.
If I press start the needle drops too early it is right on the edge of the lead in - but should be a few mm over - I had to quickly press up to save the stylus.
Is there a procedure for adjusting the timings of the carriage? Does it have something to do with the position of the ruler? I also think my carriage is going over too far in the stop position. This would make sense since it is also dropping early... its like everything is a bit off.
I will upload a photo to show how far over the carriage is moving.
You can see in the photo that the carriage will not fully stop until it has moved the cable clip out of place.
If I screw this cable clip in the proper spot - the carriage never makes it to the stop position and the motor keeps driving (uselessly).
Is it possible to loosen the flat head screws at the top of the ruler and slide it to the right (from this top view), or will this cause other problems?
It sounds like the analog control system of your Beogram has problems. If the carriage isn't stopping then the SO switch that the plastic scale passes is not engaging (or working). Take the scale off and see if it works when you operate it by hand. At any point when you press the SO switch the turntable should shut off. As soon as you release the switch the Beogram will be back on. While you are doing that you can check out the ES switch. Pressing it at any time will cause the Beogram to drive the tonearm assembly back home (until the SO switch engages to stop it). There are a number of checks to make. I show some of them on a couple of Beogram 4004 turntables I recently finished....here and here. The Beogram 4004 control system is pretty much the same as the Beogram 4002 Type 5513. I have worked on both of them.
When things like drop down position, start and stop functions don't work there is no computer to suspect. It all comes from the sensors, switches and the analog control circuits. Always suspect wires and connections (including solder joints) first. Why isn't a sensor or switch being detected? Switches can get dirty or something that engages the switch is out of position. Bang & Olufsen engineers loved optical sensors. They used them in the 400x and 800x turntables. Those of course require lamps so you have to make sure those are working. In addition, some of those sensors require the voltages involved in the signals to be at a certain level. Make sure to check those as well. If those checks pass but some function still isn't working then you can start suspecting components in the related control circuit (i.e. a transistor).
-sonavor
Success.
I followed section 3-2 in the service manual "Adjustment of electronic position marker"
Everything is operational. Thanks to all.
I tried to attach a video, but the site wouldn't let me upload it.