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  1. Do you have another unit? You can check on the...

    Do you have another unit?
    You can check on the battery unit if the resistance to the ground is the same.

    Or you can feed 3V on the battery holder and check how much current it drain.
    It can be...
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    Of course, the 7805 is compatible. The...

    Of course, the 7805 is compatible.

    The troubleshooting guide here seem reasonable to me:
    https://www.smspower.org/Development/SegaMasterSystemServiceManual

    Follow it.

    Check the voltages,...
  3. No problem :) The only other thing to do is...

    No problem :)


    The only other thing to do is to desolder IC4, or at least lift the pin 27.
    In this way you can check if the short is inside IC4 or not.


    That's what community are for. To...
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    Check on Q301 if you have voltage from the DC...

    Check on Q301 if you have voltage from the DC jack. And check on Q302 if you have voltage from the MD when you power on the MD.
  5. Thanks, i thought they was the tags.

    Thanks, i thought they was the tags.
  6. I can't find either the documentation and the...

    I can't find either the documentation and the source code.
    There is a link somewhere?
  7. It's an emi filter, there is no orientation....

    It's an emi filter, there is no orientation. Probably is a very simple filter something like this:

    15452

    The hope was that the capacitor was broken short, and the filter was pulling the line to...
  8. That's odd, but your multimeter seems to have...

    I mean EM13. Sorry :P
  9. According to this, is not a problem with the...

    According to this, is not a problem with the pull-up resistor.

    Sorry, but, i have to ask this. Is really 0 ohm, right? Not OL.
    I mean, there is a short. If you put the multimeter in the...
  10. Yes, you need a multimeter. With the machine on,...

    Yes, you need a multimeter.
    With the machine on, you can check how many volt do you have on the pin 1 of the connector.
    Set the multimeter on the Volt scale. Put the red probe on pin 1 and the...
  11. If you have the same issue without the pad, Is...

    If you have the same issue without the pad, Is not the pad.
    The D-Pad buttons directly connect the pin to the ground.

    Try to check what do you get fron the pin 1 of the pad connector and ground....
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    They must do something who catch the originale...

    They must do something who catch the originale spirit of the console. It must take at least 8 AA and don't have to last more than 20 minutes.
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    Of course you can. You need a stepdown to match...

    Of course you can.
    You need a stepdown to match the voltage input of the transformer.
    But the output still the same.

    You can't use a UK psu in US without a step down converter.
    But you can...
  14. That's true, there are a lot of people at their...

    That's true, there are a lot of people at their first work, with money to spend and no other expenses, no kids, no rents.
    About younger people, who knows, is just too soon.
    Generally they don't...
  15. Sure this is a bubble, and sure someone is...

    Sure this is a bubble, and sure someone is speculating on this. And probably this will not end tomorrow.
    I'm not sure this is only a piloted bubble, probably there is really a lot of request for...
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    If you don't trust kits buy thm from a well known...

    If you don't trust kits buy thm from a well known reseller.

    Smt or tht is your choiche.
    Tht are easier to solder, the pads still visibile for inspection. If you have to replace them again you can...
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    Check a capacitor in circuit Is tricky, even with...

    Check a capacitor in circuit Is tricky, even with a professional tool. And you can't just probe them around if you don't have a clue of how they are placed in the circuit and what theyr function is....
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    You can test the capacitors in circuit, only if...

    You can test the capacitors in circuit, only if you are sure they are not in parallel with other capacitors.

    For the voltage, unfortunately yes. The MCD1 Is not easy to diagnose
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    I have one of those. They are really handy, but...

    I have one of those. They are really handy, but they are not so accurate especially in things like the esr. So you can't rely on it ti check if a capacitor Is good or not.
    And, again, once you...
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    Personally, i would only replace the fuse and...

    Personally, i would only replace the fuse and tr4. And check the tracks around tr4. Then i would Probably power it by my bech psu, to limit the current, just in case.

    If there are no shorts, but...
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    Nope, when the ESR increase the capacitance still...

    Nope, when the ESR increase the capacitance still the same. Multimeters can only read the capacitance, so they are not good to check if a capacitor is good.
    They can be useful for short capacitors,...
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    @demonseed Sorry, I didn't take any picture when...

    @demonseed
    Sorry, I didn't take any picture when i repaired mine. Once the tray completely removed, is not so easy to put it back in the correct way. I remember when i fixed mine, i made several...
  23. No. When an MD game use the pad, the game itself...

    No. When an MD game use the pad, the game itself must control the state of the pin.
    It must work in a way like this:

    The game set the pin HIGH, then he read the values of the B and C buttons,...
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    Check the belt

    Check the belt
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    The helix screw is engaged only on the last part...

    The helix screw is engaged only on the last part of the movement, when the tray is totally in.
    Is not easy to move it by hand. Most of the time it appear to be very hard. Or the tray seem to be...
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