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  1. #1
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    metcal repair

    Does anybody have clues on the operation of these units. I have a failed PS-100 unit.

    •   Alt29th January 2006, 05:05

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  2. #2
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    metcal schematic

    Hi,

    The clever thing about the design is the method of heating. The
    "station" consist of high power rf generator enclosed in well shielded
    case. The power is delivered to the tip via a coaxial cable. The tip
    is so constructed that it absorbs the energy at the working end and
    heats up until it reaches a curie point temperature at which it becomes
    high impedance. This transition is very sharp, meaning that the tip is
    always at the correct temperature


    1 members found this post helpful.

  3. #3
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    metcal soldering station

    Hi

    most times these psu is rudementary control of current using a pot and some sort of regulator

    two things are to be looked at
    the regulation stages

    and the transformer

    first we come to the transformer section
    it will give 30 v dc and usualy is fused and also most
    transformers are double insulated types so also have an intrinsic fuse
    inside there windings on the primary windings

    check this and move on

    the rest is usualy just one adjustable regulator for 5 amps peek current

    sometimes just a wirewound pot {pay for air with these wellers}



  4. #4
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    best soldering station

    Ya, in my opinion the best soldering system on the market. Thatís why Iím trying to fix this one. Iíve gained some headways since my first post. I looked up all the IC and simiís I could find on the Internet and then started piecing them together. The main switching power supply IC was being ďinhibitedĒ by a 2n3904. There are four or five of these little devils sprinkled around the circuit and each one has the ability to shut down the main power supply circuit (switching IC). I assume this is to prevent damage in case of certain conditions which might occur. Basically itís a RF transmitter at 13 Mhz powered by a switching power supply. I bought a STSS version in EBAY lately which is a little newer version of the PS100 and Iíve been using it to compare too. I want to fix the PS100 as a back up. Some of the circuitry is the same and some isnít. Most of the components are in different places on the circuit board. While I can get it functioning, one of the little 2n3904ís is being controlled by something or some condition I canít yet isolate. While it works, I would like to get it working like it was designed. Thereís no information on the internet as far as a schematic or circuit layout that Iíve found after hours of exhaustive research. Itís kinda like a state secret when it comes to finding a schematic. Come on Metcal, these things are 15 years old. Give up the schematic.



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    Re: best soldering station

    Quote Originally Posted by microjock
    Basically it�s a RF transmitter at 13 Mhz powered by a switching power supply. I bought a STSS version in EBAY lately which is a little newer version of the PS100 and I�ve been using it to compare too. Come on Metcal, these things are 15 years old. Give up the schematic.
    hello micro i repaired the metcal 500 and my friend has bits of scematic( we found out with lots of working with ohmeter)
    showing the supply system and transistors u talking about
    we can help u and in turn i need your help me with the stss schematics



    •   Alt10th March 2010, 12:57

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    Re: best soldering station

    Quote Originally Posted by simsim50
    Quote Originally Posted by microjock
    Basically it�s a RF transmitter at 13 Mhz powered by a switching power supply. I bought a STSS version in EBAY lately which is a little newer version of the PS100 and I�ve been using it to compare too. Come on Metcal, these things are 15 years old. Give up the schematic.
    hello micro i repaired the metcal 500 and my friend has bits of scematic( we found out with lots of working with ohmeter)
    showing the supply system and transistors u talking about
    we can help u and in turn i need your help me with the stss schematics
    I'd be interested in the MX500 schematic - I want to convert some MX500s to 230VAC from 110VAC and Metcal want to charge a fortune to do it - I suspect its fairly easy...

    Cheers



    •   Alt4th April 2010, 10:47

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    Re: Metcal Soldering Station Power Supply Repair

    I'd also be interested in any info on repairing MX500's. I just got a dead one off eBay, "as is" no returns. Seller claimed it "power up", but apparently to him that means no smoke. Neither of the two lights stay on for more than half a second, with or without a new iron plugged in.

    A friend of mine said that he heard there is a capacitor that is a weak point in the design, but he didn't have any details.



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    Re: Metcal Soldering Station Power Supply Repair

    I have some experince to repair MX500
    Fault indication : Green light on but soldring Iron not heating.
    It mainly blow it ZTX550 Transitor wich is heat sinked with a small
    round heat sink filled with a small amount of heat sink compound.
    Replaced it and Station working OK



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    Re: Metcal Soldering Station Power Supply Repair

    Tanks for your help



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    Re: Metcal Soldering Station Power Supply Repair

    Hi. Sorry for my language. Metcal MX500.
    I have a problem. When you turn on the station, the orange LED is ON.
    Soldering iron is cold.
    Grounding good.
    Where to start?
    Last edited by Botsman; 23rd September 2011 at 07:22.



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    Re: Metcal Soldering Station Power Supply Repair

    What are typical fault in this model?
    Where can I find a diagram?
    Pleas help me....



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  13. #13
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    Re: Metcal Soldering Station Power Supply Repair

    Can anyone help me solve a problem with an MX500? About a year ago mine failed so I downloaded the schematics mentioned above and found that U4 had died, I replaced it and all was well until last week when the unit failed again. I found that R1 had smoked and Q1 had blown to pieces,so I replaced them, checked surrounding components and plugged the unit in. All looked well so I turned it on, the yellow LED came on for a few seconds and then R1 and Q1 died again. I am a bit flummoxed



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