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  • Re: Beomaster 1700 (type 1701) revisited - Tech Help needed

    Wow! I'm impressed! Congratulations! To be honest, I wasn't very hopeful after having seen what you allowed your soldering iron do to the original board and after seeing some blatant mistakes in your "latest draft" in the post above (sorry for not posting when I saw it;I had 2 hectic weeks). I was actually hoping that you'd take up Martin's offer of getting your hands on a proven working board.. But now that you've managed to make a new board from scratch, all I can
    Posted to The Workbench (Forum) by manfy on Mon, Jun 15 2020
  • Re: Beo6 with no touch functionality.

    [quote user="BeoMotion"] Sorry, but I really don’t see where this should be a CSP package. Have a look at the datasheet. It’s a standard QFN with EP and 0.5 mm pitch. I agree that you should only try to replace it if you know what you are doing. I’m working with embedded systems every day so might have forget to mention that disclaimer... If you are trained doing such rework it is certainly much easier and quicker than any other possibilities after confirming power supply
    Posted to The Workbench (Forum) by manfy on Tue, Jun 2 2020
  • Re: Beo6 with no touch functionality.

    [quote user="BeoMotion"] The best way to start is just taking an oscilloscope and try to see if there is clock & data activity and a stable power supply. Due to the good availability of the chip the next step would be replacing it carefully. While dead ceramic caps are very unlikely one additional thing could be replacing the single aluminum one. Even there I think a fault is pretty unlikely. [/quote] I fully agree with the first part. Measuring various pins on the chip with a scope
    Posted to The Workbench (Forum) by manfy on Tue, Jun 2 2020
  • Re: Beo6 with no touch functionality.

    [quote user="BeoMotion"] The number of cap sense inputs does not equal to the maximal possible touch points. Those values are not 1/0 but more like an analogue reading from multiple cells that the controller will then use for calculating the exact position. When placing your finger on the screen the value of multiple cells will change. [/quote] Good point. But it still seems an odd thing to do, repurposing this chip for touchscreen use when you have proven dedicated chips for that purpose
    Posted to The Workbench (Forum) by manfy on Tue, Jun 2 2020
  • Re: Beo6 with no touch functionality.

    [quote user="Weebyx"] It is this IC. https://www.analog.com/media/en/technical-documentation/data-sheets/AD7147.pdf /Weebyx [/quote] No, that seems unlikely! The chip has only 13 sensor inputs, so at best you'd get a 6x7 matrix of touchscreen points and that's way too low for an acceptable touchscreen resolution. I'm quite sure that the AD7147 is the chip that provides the wheel functionality on the keypad. Just look at the "Typical Application Circuits" section at
    Posted to The Workbench (Forum) by manfy on Mon, Jun 1 2020
  • Re: Beogram 1200 Rotor assembly

    [quote user="MattSquire75"] Yes its very strange indeed. The top section of the rotor shows no bearing at all? [/quote] I'm sure there's something there. It's just hard to spot the top bearing in those drawings. (On page 15 you see a jig for centering the rotor in the stator. So there must be some movable adjustment thinggy on the frame where you mount the motor!) Actually, pos 101 on page 21 is probably the top bearing for the record spindle and not the motor. Don't get
    Posted to The Workbench (Forum) by manfy on Fri, May 22 2020
  • Re: Beogram 1200 Rotor assembly

    [quote user="MattSquire75"] Forgot to mention. I looked at the full page in the manual that shows the top parts, but it seems to be missing quite a few parts. [/quote] Yes, the complete motor/gear assembly you see on page 24 doesn't seem to have a top bearing. You can find that on page 21, pos 101: "Bearing housing with top bearing". But the design looks quite different from your brass bearing pos. 230. And according to the service manual, there's only one place that holds
    Posted to The Workbench (Forum) by manfy on Fri, May 22 2020
  • Re: Beogram 1200 Rotor assembly

    The service manual doesn't say anything about the plastic washer, but yes, the only place where it seems to make sense is between the rotor (226) and the brass bearing (230).
    Posted to The Workbench (Forum) by manfy on Fri, May 22 2020
  • Re: Beo6 with no touch functionality.

    I've done some more digging and it seems that you may not be completely out of luck after all. The official B&O marketing video shows some details that are very interesting. This is the main board, ie. the motherboard of the unit and it is part of the display module. The bad thing about that is that the official replacement display module from B&O is probably prohibitively expensive. The good thing is that it shows the flex cable connector, which is a potential source of a malfunctioning
    Posted to The Workbench (Forum) by manfy on Wed, May 20 2020
  • Re: Beomaster 1700 (type 1701) revisited - Tech Help needed

    [quote user="Pete"] Signal GND to Chasis = 90 k Ohms Signal GND to GND on Power Supply = 0.5 Ohms I notice on the PCB there are two holes drilled, one on signal GND and the other on Power supply GND... Could the GND issue be the cause of all these components frying? I wander, when I construct the new board should I merely connect signal GND to Power GND to test the new board? [/quote] 0.5 ohms between both ground planes at the power supply is normal because that's where they are centrally
    Posted to The Workbench (Forum) by manfy on Tue, May 19 2020
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