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Recent content by IamJatinah

  1. I

    Replacing upper board with pot. for treadmill motor speed control.

    Hi All, This looks to be a digitally driven controller, it shows a single TRX pin. Not a good choice for the project. I may have a decent controller for up to 2hp PMDC that would require a PWM to drive it neatly, but easy to configure. The only "pot" friendly DC controller I know in...
  2. I

    Treadmill motor control board testing

    Hi There.....This is a common unit thru our facility. The part about the PWM LED never lighting up or "flashing" when you press Start or Go, appears to show no speed command getting to that lower board. That LS error is a default error thrown when the belt speed doesn't match a setting upstairs...
  3. I

    treadmill DCMD67 board

    I don't know that I have this unit around but I will check thru the day, but it is unlikely. My point of those resistors being burnt is that the IC U9 will also be fried most likely. The resistors you found burnt are setting up drive signals for the main switching transistor. If these resistors...
  4. I

    Super Hot Capacitors...!

    Correct. Bulging capacitors are a sign of outgassing, the final stages of a capacitors demise. All capacitors listed should be replaced, as well as one you may not have mentioned, that should be somewhat near the 150uf cap, that lives in the primary power circuits, maybe 100uf or 47uf, but this...
  5. I

    treadmill DCMD67 board

    Hi There, well....I can't see the resistors you are talking about in this pic, maybe another pic closer to the parts may help. Are they surface mount resistors? SMT resistors should have tiny writing on them, shown as 122 or 473 or something like that..... These numbers relate to "First Digit...
  6. I

    120 AC to 120 DC

    You mentioned a "smoothing cap", and the correct answer is YES....you are indeed going to find "Storage/Filter" capacitors in "ALL" dc motor control boards except SCR controllers which are horrendously noisy, outdated, ineffecient and ugly. ALL DC Drives have huge capative storage ability for...
  7. I

    Help with controlling a treadmill dc motor controller please.

    Hi All...... I was giving Minder the benefit of the doubt in some past posts, but obviously minder doesn't know I worked for Johnson for many years, know their "2" china factories, JHT1, JHT2 in Shanghai, their facility in Taiwan that makes Matrix equipment, most all the folks at the US...
  8. I

    Diode bridge

    Hmmm...first of all....where would you find a bridge rectifier capable of 20-30A constant current at the loaded supply voltage once the motor reaches it's constant-horsepower region? There are two stages, constant-torque and constant-horsepower. This device, your bridge you're talking with a...
  9. I

    Help with controlling a treadmill dc motor controller please.

    Hi Ironworker! Well, you picked a hard set to use for your application but there is hope ;o)) The Johnson SJED08089 board and the SJED08092 will not operate without valid feedback from a front roller and the motor encoder wheel, that ugly wheel of death attached to the rear end of the motor...
  10. I

    help identifying part

    Hi There...this is the upper control (brain board) of the IFT AC Variable Drive, made by Advanced Drive Technology. Your version of software shown relates to the Precor 932 Treadmill....yes? DO NOT TOUCH those surface mount parts unless you want to kill that control board ;o) I know exactly...
  11. I

    120 AC to 120 DC

    Hi Folks, novel idea, mechanical and mesh nightmare. There are easy ways to regulate motor speeds for all types of motors, but we must open our minds a bit and talk it thru.... for lathes and milling, similar to treadmills, we drive as fast as we'd like via a button or dial(pot). Motor...
  12. I

    Diode bridge

    Hi There....whoa......slow the horses....you cannot drive any motor with a simple bridge rectifier for longer than say.....a few seconds for the diodes to fry. As someone pointed out....POWER is huge in the motor world. Your treadmill motor and controller are from what brand? I can maybe help...
  13. I

    Treadmill motor control board testing

    Hi There, well, nice work on looking up the TL494 and understanding it's use and purpose, although there is a lot going on around that tl494, more than just a magical PWM drive signal and an on/off switch. First lets remember that motor drive rail is a HOT-Grounded power rail with lethal...
  14. I

    Treadmill motor control board testing

    Great penmanship I'd say! Hmm....to find the PWM input signal to that little daughter board, first lets look up the TL494 PWM controller IC that I see int eh picture, which is the main switch controller for the walking belt speed commands. There will be a comparator inside the TL494 which is...
  15. I

    Treadmill motor control board testing

    Hi There, sorry for the delay. I am looking at the pic as I type this reply to help organize things, and thanks for the pic btw. Here are the few things I can spot right off.... 1) 2 left Relays, blue, are for elevation Up/Down, with tab connectors next to them. 2) Large Blue Relay in the center...
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