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  1. dorke

    Help! Repairing water damaged PCB from Massage chair.

    O.K the solder diameter is too large for this job. This is why you can't get the proper profile and you have too much solder. you should use smaller diameter 0.6mm would be fine. Get your solder from a good firm like kester (worth every penny ,no cheap Chinese stuff it is mostly rubbish and the...
  2. dorke

    dirty waveform

    Take a single sample,without average.and show it After the data is in the scope memory ,zoom in the area shown and show it as well.
  3. dorke

    Help! Repairing water damaged PCB from Massage chair.

    The soldering looks much better.:) It looks clean and seems shiny. But still too much solder used. You should get the "mount Fuji silhouette" Using liquid soldering flux helps a lot if the PCB isn't clean. What is the diameter of the solder you use? How did you clean the soldering?
  4. dorke

    How to Solder properly

    Soldering, still a vital skill for all of us with "hands-on" attitude to electronics. Unfortunately skills are lacking especially with beginners. The PCAE videos on soldering is an old great and very thorough way to learn properly the art of soldering, watch them all, learn, and enjoy. And...
  5. dorke

    How to Solder properly

    dorke submitted a new resource: How to Solder properly - A series of profesional Videos from PACE Read more about this resource...
  6. dorke

    Merry Christmas and a happy new year ...

    Yes, as we say here, May the coming year be better... in any way possible.:)
  7. dorke

    Help! Repairing water damaged PCB from Massage chair.

    It is a series of videos ,take your time watch them and learn, they are very good professional ones. The pump suckers may suck the solder with the Pad. I have seen that many times ,especially if the PCB quality isn't very good. If you know how to use the wick it is safer an cleaner. What did...
  8. dorke

    dirty waveform

    What kind of signal is it? Is the trigger level about 19V? No, averaging is a distortion of reality. Can you use a "single time Acquisition" What is the ground clip of the scope probe connected to?
  9. dorke

    Help! Repairing water damaged PCB from Massage chair.

    Jona, Please see the videos. Only then we can discuss what is wrong...;) For now ,I'll just say that you should have used a "solid single wire" for bridging.
  10. dorke

    Help! Repairing water damaged PCB from Massage chair.

    That is a good solder iron. Please show the solder wire. Don't use the sucker,it makes more damage than good, instead use a solder wick 0.1" or so. Please watch the video above and learn how to solder, then practice on some junk board( desoldering and soldering). when you think you can do a...
  11. dorke

    Help! Repairing water damaged PCB from Massage chair.

    Wow, That's an understatement :confused: Jona , I see a total mess:eek: ' I'm afraid you have to "repair the repair",all of it,that bad. Please show the soldering Iron you use. Look here for a good old soldering video
  12. dorke

    Help! Repairing water damaged PCB from Massage chair.

    Cozzia, that's a start. You can contact them an inquire about a service manual. A bit difficult without the model number but a photo of the chair and remote may do the trick here
  13. dorke

    Help! Repairing water damaged PCB from Massage chair.

    Hi Jona Welcome back. Nice looking chair. and a jungle of wires underneath. Is there a manufacture name and product model? In you first post you say you fixed 2 other chairs. Do you still have them? They can be used as a precious reference to a working unit, that can make life a lot simpler...
  14. dorke

    oscillator help

    What site ?
  15. dorke

    dirty waveform

    I'm not familiar with that specific scope and the way "settings" are displayed on the CRT. What are(though a picture is worth thousand words ;)): 1.The trigger setting. 2.Acquisition method. 3.Time/div
  16. dorke

    transistor pairing? or not?

    No,the gate resistors don't adjust gain. Their purpose is totally different: Maintain the Amp stability(prevent oscillations of the Amp.) Look at section 7.1 I'm wondering, are you actually going to build the AMP? To be able to build a ultra-HiFi High Power AMP needs a lot of Knowledge and...
  17. dorke

    A hard to resist problem

    Agree,the smaller ones look like 1/4W. You can actually check the wattage by a simple worm up test: Use a PS to create 1/4W on the resistors. a 1/2w one will not get warm while a 1/4w will.
  18. dorke

    Drive two relays based on input voltage.

    Yep, here is a fail safe relay connection for this application. In no case can the 2 solenoids/motors be activated at the same time. If such a "command is erroneously issued " both will be disconnected .
  19. dorke

    dirty waveform

    And please show a photo of all the Scope knobs and settings
  20. dorke

    Help! Repairing water damaged PCB from Massage chair.

    Jona, Don't ever think about "taking off every component on this board cleaning it up and re-soldering it". That is not the way to fix stuff...probably the safest way to turn this unit into junk. "I was going in to take out all the diodes with my soldering tool to test them and there was a...
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