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    Rework station pcb design

    Hi

    I'm in the early stages of trying to build myself a rework station so I would like to keep things as simple as possible and also within reason cost wise.

    Whilst doing some research on what others had done i came across a design that had been done in fritzing which i have attached. The person who designed this seems to have abandoned it as I am unable to contact him.

    I couldn't get on well using fritzing so i have created a schematic from the fritzing layout.

    There's quite a few component values that I'm not sure about, but for now if you guys can cast your expert opinion on whether I've draw the schematic correctly that would a great help.
    Attached Files
    Last edited by pintglass; 01-23-2020, 04:59 PM.

    #2
    Re: Rework station pcb design

    Can I ask for the reason you want to design and build a rework station

    Because you have struck some interest in me about this question about building one
    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


      #3
      Re: Rework station pcb design

      I've wanted to build one for ages's but never found the time, I mess around repairing game consoles and mobile phones so it would mainly be for that.

      This is just a hobby for myself so an other reason is i enjoy making things and learning from it. At the moment I was just looking for some advice as to whether I've draw the schematic correctly, and as the original design is from an other hobbyist a bit of reassurance that the circuit wouldn't have any major issues, mainly on the A/C side.

      Comment


        #4
        Re: Rework station pcb design

        Do you know if the actual circuit is built and tested?
        The TRIAC Gate drive/snubber R5 of 2.2K is way too high.
        Read and study the ST application notes attached.
        Power supply filter caps C5, C7 should be hihger value.
        You should also have the 0.1uF ceramic close to VCC pin of each IC.
        Thermo couple measurement circuit is also very questionable.
        How well do you want to maintain the tempearture?
        Study here:
        https://cdn.badcaps-static.com/pdfs/...b2f4b7ac65.pdf
        https://www.analog.com/en/analog-dia...ocouples.html#
        https://www.youtube.com/watch?v=5aFSLzeLQ6c
        Attached Files
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment


          #5
          Re: Rework station pcb design

          Originally posted by pintglass View Post
          I've wanted to build one for ages's but never found the time, I mess around repairing game consoles and mobile phones so it would mainly be for that.

          This is just a hobby for myself so an other reason is i enjoy making things and learning from it. At the moment I was just looking for some advice as to whether I've draw the schematic correctly, and as the original design is from an other hobbyist a bit of reassurance that the circuit wouldn't have any major issues, mainly on the A/C side.
          Consoles with large thick PCBs are very different to small delicate mobile phones.
          I wouldn't even think about putting a phone on my Scotle (clone?) BGA rework station, it's far to large and powerful. I think you need to decide if you're making it for console/tv/laptop boards which will need a large bottom heater and large hot air/IR nozzle or for phones which will be a lot smaller and won't need nearly as much power.

          Comment


            #6
            Re: Rework station pcb design

            Originally posted by budm View Post
            Do you know if the actual circuit is built and tested?
            The TRIAC Gate drive/snubber R5 of 2.2K is way too high.
            Read and study the ST application notes attached.
            Power supply filter caps C5, C7 should be hihger value.
            You should also have the 0.1uF ceramic close to VCC pin of each IC.
            Thermo couple measurement circuit is also very questionable.
            How well do you want to maintain the tempearture?
            Study here:
            https://cdn.badcaps-static.com/pdfs/...b2f4b7ac65.pdf
            https://www.analog.com/en/analog-dia...ocouples.html#
            https://www.youtube.com/watch?v=5aFSLzeLQ6c
            Thanks for all the info.

            According to the guys hackaday page he has tested it but I don't know to what extent.

            https://hackaday.io/project/10541-di...rework-station

            I would like to maintain the temperature as accurately as possible which i don't think this design will allow. I'm looking into changing the thermocouple circuit.

            Comment


              #7
              Re: Rework station pcb design

              Well I've been reading as much info on this as I can, but being honest alot of it goes over my head.
              Anyway I was just going to order a few parts to have a mess around with but I'm unsure on the voltage rating of the ceramic snubber caps C1, C2 in my schematic.

              Should these be rated for my line voltage peak?

              Comment


                #8
                Re: Rework station pcb design

                You one of each of the following

                https://www.ebay.com/itm/NEW-LCD-Dis...EAAOSwXRleLK3W

                And one of these

                https://www.ebay.com/itm/New-Part-So...QAAOSwmdtd5Y2a

                If you decide to use both of these items

                Please let me know and I will help you hook it up
                Last edited by sam_sam_sam; 02-03-2020, 07:36 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


                  #9
                  Re: Rework station pcb design

                  I thought about doing the same thing


                  If you buy one of these units
                  do a mod to and do a way with
                  air hose and pump and buy the soldering
                  iron and use the temperature sensor in it

                  Hook up you heater setup in place of the air pump and the heater in the handle

                  You would have a good temperature controller

                  ZD-939L


                  Hot air repair/rework stationwith LCD Display.
                  Features: internal air supply, stable temperature, comfort grip handle, interchangeable hot air nozzles for SMT devices.
                  LCD Display: "SET" Temperature & "Actual" Temperature of Nozzle
                  Selectable "C" or "F" Readings
                  Specifications:
                  Voltage: 110-130VAC 60Hz
                  Power input: 320W
                  Adjustable Air Flow: ~22L/minute(max)
                  Adjustable Air Temperature 150-500deg "C"
                  Sensor: Type K Thermocouple
                  Air Pump: diaphragm
                  Hose Length: 1m
                  Accepts most 22mm Nozzles.
                  Supplied Nozzles: ~10x10mm, 14x14mm, 2.5mm Dia & 4.5mm Dia.


                  You buy it here

                  https://m.reichelt.com/de/en/digital...LE=161632&&r=1
                  Last edited by sam_sam_sam; 02-04-2020, 04:26 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


                    #10
                    Re: Rework station pcb design

                    Thanks for the idea, but I don’t see how you would be able to control the rate of rise of temperature with this setup

                    I’m still doing more reading than anything at the moment and just making a circuit to use a
                    Ad8495 temperature ic which I think will be better than what I had in my schematic.
                    Last edited by pintglass; 02-10-2020, 08:25 AM.

                    Comment


                      #11
                      Re: Rework station pcb design

                      I'm not able to see how a hot air station that's 320W can control a 600W top heating element.

                      Why not buy a PID controller, relay and thermocouple ?
                      https://www.ebay.co.uk/itm/220V-NEW-.../173982370797?

                      Comment

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