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Zd-939l (main 939a-ver 4)

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    Zd-939l (main 939a-ver 4)

    No heat at all from unit,

    replaced. Element in reflow hot air head end

    replaced bmt08 8amp 600v triac, nothing

    display just reads, error.. Nothing,, not even room temp 0.25 as it should start,, has anyone else had this purchased 2 of ebay. Faulty but brand new ,,, u can see never been opened, im now looking at bmt137 triac. As i have removed this next to optocoupler and still dead, doing the same., so maybe optocoupler or this triac, anyone else. Any info on these cheers, its duratool zd-939l

    #2
    Re: Zd-939l (main 939a-ver 4)

    Found two issues and fixed,, old element temp core sensor was faulty. And wire from temp in element to main 939a ver4 board was faulty at crimp... On 2 of these just goes to show how crap they are,

    Comment


      #3
      Re: Zd-939l (main 939a-ver 4)

      why crap? you got faulty returns - there are a huge number out there that work fine.

      Comment


        #4
        Re: Zd-939l (main 939a-ver 4)

        Originally posted by promo7uk View Post
        Found two issues and fixed,, old element temp core sensor was faulty. And wire from temp in element to main 939a ver4 board was faulty at crimp... On 2 of these just goes to show how crap they are,
        I have found the same thing with the company that makes these units there quality control has lot to be desired

        In the Desoldiering Gun units this sometimes can happen that the temperature sensor goes bad this also happens with the soldering irons as well

        The temperature controller board starts having problems controlling the temperature swings are wider to point that really can not use any more or the back light stops working or the switching power supply take a shit
        Last edited by sam_sam_sam; 08-11-2018, 06:42 PM.
        9 PC LCD Monitor
        6 LCD Flat Screen TV
        30 Desk Top Switching Power Supply
        10 Battery Charger Switching Power Supply for Power Tool
        6 18v Lithium Battery Power Boards for Tool Battery Packs
        1 XBox 360 Switching Power Supply and M Board
        25 Servo Drives 220/460 3 Phase
        6 De-soldering Station Switching Power Supply 1 Power Supply
        1 Dell Mother Board
        15 Computer Power Supply
        1 HP Printer Supply & Control Board * lighting finished it *


        These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

        1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
        2 Hem Saw Computer Stack Board

        All of these had CAPs POOF
        All of the mosfet that are taken out by bad caps

        Comment


          #5
          Re: Zd-939l (main 939a-ver 4)

          Originally posted by promo7uk View Post
          No heat at all from unit,

          replaced. Element in reflow hot air head end

          replaced bmt08 8amp 600v triac, nothing

          display just reads, error.. Nothing,, not even room temp 0.25 as it should start,, has anyone else had this purchased 2 of ebay. Faulty but brand new ,,, u can see never been opened, im now looking at bmt137 triac. As i have removed this next to optocoupler and still dead, doing the same., so maybe optocoupler or this triac, anyone else. Any info on these cheers, its duratool zd-939l
          Check and see if the the temperature controller is sending a 3 volt signal from the connector that only has two wires that go the optic sensor

          You do have to have the temperature on the display show 77*F or you will not have this 3 volt signal try powering a LED on those two wires

          If you do not get the 3 volt signal with the 77*F showing on the display then the temperature controller has taken a shit

          One note you can take the two wires that go to the temperature sensor and short then together
          BUT only do this to see if can get the 3 volt signal only you will not have any temperature control

          I have about ten of different types of units that all use the same temperature controller
          I have had to work on these units many times in the past

          If you need a new temperature controller board you can buy them on eBay also the heater element with the temperature sensor are available on ebay

          If you need any other information just ask me and I see if I can answer your questions
          Last edited by sam_sam_sam; 08-11-2018, 07:13 PM.
          9 PC LCD Monitor
          6 LCD Flat Screen TV
          30 Desk Top Switching Power Supply
          10 Battery Charger Switching Power Supply for Power Tool
          6 18v Lithium Battery Power Boards for Tool Battery Packs
          1 XBox 360 Switching Power Supply and M Board
          25 Servo Drives 220/460 3 Phase
          6 De-soldering Station Switching Power Supply 1 Power Supply
          1 Dell Mother Board
          15 Computer Power Supply
          1 HP Printer Supply & Control Board * lighting finished it *


          These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

          1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
          2 Hem Saw Computer Stack Board

          All of these had CAPs POOF
          All of the mosfet that are taken out by bad caps

          Comment


            #6
            Re: Zd-939l (main 939a-ver 4)

            Originally posted by promo7uk View Post
            Found two issues and fixed,, old element temp core sensor was faulty. And wire from temp in element to main 939a ver4 board was faulty at crimp... On 2 of these just goes to show how crap they are,
            Were you able to fix your unit
            9 PC LCD Monitor
            6 LCD Flat Screen TV
            30 Desk Top Switching Power Supply
            10 Battery Charger Switching Power Supply for Power Tool
            6 18v Lithium Battery Power Boards for Tool Battery Packs
            1 XBox 360 Switching Power Supply and M Board
            25 Servo Drives 220/460 3 Phase
            6 De-soldering Station Switching Power Supply 1 Power Supply
            1 Dell Mother Board
            15 Computer Power Supply
            1 HP Printer Supply & Control Board * lighting finished it *


            These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

            1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
            2 Hem Saw Computer Stack Board

            All of these had CAPs POOF
            All of the mosfet that are taken out by bad caps

            Comment

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