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  1. dorke

    Electric question

    Welcome to EP. For debugging the Dimer-Stapler issue. Try operating them on different circuits and as far away from one another. For the Cutter, It can be a faultily breaker or another fault in the unit. The proper way to find out is measuring the current with an AMP-meter that can...
  2. dorke

    Reading LCD display

    You need to focus your question: Which LCD display? There are thousands of models and brands. LCD displays are mostly "write" devices, some are readable but not nessasserly all are.
  3. dorke

    DSP/Amp Problem (Reversed Polarity)

    When you say " voltage at the terminals" are you talking about the input voltage to the unit i.e VCAR? If so,I guess you are still working with the P.S. Does that P.S have a current limit "set knob"? If it does crank it up to it's maximum. Can you measure the current that the unit is drawing...
  4. dorke

    DSP/Amp Problem (Reversed Polarity)

    Good question. Don't know,worth trying to see if it makes any difference. Is there a J5(USB connection) on the board? Anything connected to it?
  5. dorke

    Help! Reading Voltage with Arduino

    I think it will be best if you do all measurements in parallel (all 3 "meters" connected) at the same time. I assume you did one at at a time(only one connected).
  6. dorke

    Help! Reading Voltage with Arduino

    There could be other issues. Can you show the circuit and the actual way you measure with the scope and DMM
  7. dorke

    DSP/Amp Problem (Reversed Polarity)

    That would be page 69. How complicated they make the μC controllers now days...;)
  8. dorke

    Help! Reading Voltage with Arduino

    I would trust the scope the most. Which one is it? Is it calibrated? You can check it is with the "cal" point on it, or with an external known an measured voltage(say a 5V DC volts measured with a DMM as well). The scope is giving you the P.T.P(Peak to Peak-full swing) voltage. The DMM is...
  9. dorke

    DSP/Amp Problem (Reversed Polarity)

    I meant TP4 (Test Point) not P4. It is also the anode of D20
  10. dorke

    DSP/Amp Problem (Reversed Polarity)

    No,that is not that. There are 2 different 3.3V 1. 3P3V this is generated by U4 on pin 4 it feeds most 3.3v of the circuit 2. 3P3V_ON a different voltage, it only feeds the μC(U23) and U10,U26.kind of a STBY voltage. (with 5V_ON) I think I found it (from the note on the sch), it is generated by...
  11. dorke

    DSP/Amp Problem (Reversed Polarity)

    Rick, I would check a bit more before swapping. The problem I can see is this: U4 is "turned-off" by the voltage on pins 9-11 going from 3.28v to 0. Why that happens is the question to solve. What puzzles me the most is the voltage called 3P3V_ON. I can't see how this is "generated". Please...
  12. dorke

    DSP/Amp Problem (Reversed Polarity)

    Yes, It is better(looks fine). Now , please measure the same(B,C,E) for Q9. and the voltages on IC4 pins 9,10,11
  13. dorke

    Help! Repairing water damaged PCB from Massage chair.

    Very good news.:) You are correct,looks like the main board is at fault . we can do a compare between Up and Down, but can also measure directly like so: Please measure the 3 red points relative to GND with the jumpers in the IC so that the carriage should move down.
  14. dorke

    Variable Voltage Regulator and Pass Transistor

    I agree with the above writers on the issue of buying a power supply. There are other issues you need to think about. 1st, what is the equipment you will power with the PS. Is it an emergency device, a medical device, what are the consequences of it's failure ? etc. This will lead you to the...
  15. dorke

    Need help with some python debugging

    "We have been trying to debug Jay's program. Since we don't program, we think we've done pretty well ..." That doesn't compute :confused:. Must be my Spanish or your Englisho_O Anyways, A simple line may help you while debugging. It will print the type that causes your problem. put it before...
  16. dorke

    DSP/Amp Problem (Reversed Polarity)

    Please measure voltages on IC4 pins 9,10,11 Base of Q10 is to high. Please check Collector and emitter of Q10 as well
  17. dorke

    B & O Penta amplifier repair and Tr equivalents

    Have you any good Tr.s to test for reference? For instance,check on another channel. Another thing , make sure there is no insulating coating on the pads you have checked(just to be on the safe side of the measurements) That is a very long line of destruction!:eek: I would start removing...
  18. dorke

    Soldering iron trouble.

    Your tip looks fine. I think it must be that you are using poor quality solder. You can improve the bad solder using solder paste. But, I would recommend Kester brand, not cheap but worth every penny.
  19. dorke

    B & O Penta amplifier repair and Tr equivalents

    If the measurements are correct than all the Tr.s are you measured are bad: RED -shorted C-E . Blue-open B-E. Green- somewhere in the middle but also bad. Have you measured out of circuit? Need to check the power resistors and also the next bunch in red below:
  20. dorke

    Question about passing a variable value to an array in C

    A few things: 1. You need to declare the array size and type . 2. What you "printed " is accessing element 3 in the "Random "array,is that what you wanted? 3. How is "TMR0" defined in your code? 4. If you just stick a value directly,you do "find" it there right?
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