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<1…18192021222324…34>
  • Using an ATX power supply - Spectrum 48kOK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :( There is a MOD to use an ATX power supply on the…

    [QUOTE=Turrican;635259]OK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :(
    [/QUOTE]

    What part of the DC-DC circuit does not work? Which voltages do you have and which are not there?
    Johan1973 Johan1973 June 2012 Hardware
  • Using an ATX power supply - Spectrum 48kOK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :( There is a MOD to use an ATX power supply on the…

    ... circuit does not work? Which voltages do you have and which ...
    Turrican Turrican June 2012 Hardware
  • 48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…

    ... any guide to checking RAM voltages etc, none are getting hot ...
    napoleonblownaparte napoleonblownaparte June 2012 Hardware
  • Spectrum 48K help neededI hav got an old Specrtum 48K issue 3. When I plug-in power connector it doesn't show the home screen (c) Sinclair.... From about 50 times trying to …

    ... 's a good sign the voltages are OK and you get ...
    RetroTechie RetroTechie June 2012 Hardware
  • Internal amp and signal cleaner for tape inHello! Is there known to work INTERNAL schematic which cleans signal from tape in and amplifies it. I need such thing so i can load from my smartpho…

    ... work with such low input voltages?

    I also have ...
    ArtemKuchin ArtemKuchin July 2012 Hardware
  • 48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…

    Ok, now I've got myself together and had time to check, all the voltages seem to be in the right places - is there anything else I can test?
    napoleonblownaparte napoleonblownaparte July 2012 Hardware
  • 48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…

    ... since you have the correct voltages.
    Unless you happen to ...
    Johan1973 Johan1973 July 2012 Hardware
  • Changing the mains cord in PSUI have an UK +3 PSU. I have an adapter to use it in Euro mains jacks but I want to change the mains cord to one with an Euro plug. You have to change…

    actually you might be on to something... I have in the past powered a +2A from a amiga 500 Psu as it has all the same voltages as the Spectrum +2A, +3 might be worth converting one for your Spectrum.
    lips2k11 lips2k11 July 2012 Hardware
  • Interesting Keyboard FaultWhy-oh-why do I keep buying half-dead Speccys off fleabay. Bought this one as a source of spares, it was listed as having a non-working keyboard due…

    ... to decode IORQ+A0? (TR6). A damaged TR6, putting permanently 5V at ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • 48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…

    ... of ZTX313s to replace the TR6 on a machine with a ...
    napoleonblownaparte napoleonblownaparte August 2012 Hardware
  • Interesting Keyboard FaultWhy-oh-why do I keep buying half-dead Speccys off fleabay. Bought this one as a source of spares, it was listed as having a non-working keyboard due…

    Replacing TR6 has done the trick - thanks McLeod.
    napoleonblownaparte napoleonblownaparte August 2012 Hardware
  • Interesting Keyboard FaultWhy-oh-why do I keep buying half-dead Speccys off fleabay. Bought this one as a source of spares, it was listed as having a non-working keyboard due…

    I have a similar problem.
    My 48K issue 2 does not receive keyboard data.
    Keyboard and connectors are OK.
    On my PCB there is no TR6, or is this the transistor on top of the CPU between pins 11&30?
    eptheca eptheca August 2012 Hardware
  • Interesting Keyboard FaultWhy-oh-why do I keep buying half-dead Speccys off fleabay. Bought this one as a source of spares, it was listed as having a non-working keyboard due…

    ... board not to have a TR6 as some were fitted with ...
    napoleonblownaparte napoleonblownaparte August 2012 Hardware
  • Interesting Keyboard FaultWhy-oh-why do I keep buying half-dead Speccys off fleabay. Bought this one as a source of spares, it was listed as having a non-working keyboard due…

    [QUOTE=eptheca;644475]On my PCB there is no TR6, or is this the transistor on top of the CPU between pins 11&30?[/QUOTE]
    Yes, it is.
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • 48K+ losing horizontal syncHello! I've got this 48K plus in perfect cosmetic condition and it works well except for when it gets a tad bit warmer the image rolls around. That w…

    ... regulator would do indeed... the voltages look correct but it might ...
    pkersey pkersey August 2012 Hardware
  • Spectrum+ and dead keyboardI have a Spectrum+ which had no picture just snow on TV. I found instructions, that it might be regulator 7805, so I changed it. Now I saw something …

    I changed TR6, but still no response from keyboard.
    lillaolle64 lillaolle64 August 2012 Hardware
  • (Re) building a ZX Spectrum laserharpThe Cambridge show is nearing, and I want to bring my laserharp with me. Why? Because it's built around a ZX Spectrum +2: [IMG]http://benophetintern…

    ... use them to compare two voltages (comparator), amplify a voltage with ... stable, even with different input voltages.

    I hope to ...
    bverstee bverstee August 2012 Hardware
  • (Re) building a ZX Spectrum laserharpThe Cambridge show is nearing, and I want to bring my laserharp with me. Why? Because it's built around a ZX Spectrum +2: [IMG]http://benophetintern…

    ... get the positive and negative voltages that float around zero, to ...
    bverstee bverstee August 2012 Hardware
  • THE VOLTAGE OF THE POWER SUPPLY UNITCould anybody who has a ZX Spectrum 128k +2 count with a voltameter the voltage which the power supply unit gives to the Spectrum and tell me the [B]…

    ... DC power plug, the output voltages on my PSU are:-
    1024MAK 1024MAK August 2012 Hardware
  • Spectrum +2A not workingI bought my first Spectrum, the +2A, and it's not working. When I try to start it, only the power led is blinking and no picture to TV. What could be…

    Something weird has happened to PSU because earlier it gave right voltages, but now voltages are too low. I tried AT-power from old PC and now Spectrum is working. At first it didn't load tapes but cleaning helped.
    zapper zapper August 2012 Hardware
  • (Re) building a ZX Spectrum laserharpThe Cambridge show is nearing, and I want to bring my laserharp with me. Why? Because it's built around a ZX Spectrum +2: [IMG]http://benophetintern…

    ... work properly)
    - Stable output voltages, fast response, built in protections ...
    bverstee bverstee August 2012 Hardware
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... diodes don't allow dangerous voltages to enter the logic cells ...
    mcleod_ideafix mcleod_ideafix August 2012 Sinclair Miscellaneous
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... diodes don't allow dangerous voltages to enter the logic cells ...
    ANDREW RYALS ANDREW RYALS August 2012 Sinclair Miscellaneous
  • Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…

    ... .

    How is your voltages out from the power circuit ...
    Johan1973 Johan1973 August 2012 Hardware
  • Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…

    ... are okay. [/QUOTE]

    Voltages look good compared to another ...
    pkersey pkersey August 2012 Hardware
  • Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…

    ... =Johan1973;648210]How is your voltages out from the power circuit ... ?[/QUOTE]

    So far, voltages look ok. Will keep inspecting ...
    pkersey pkersey August 2012 Hardware
  • ZX Spectrum power supplyHi, I'm looking for a small lightweight power supply that would be a perfect substitute for the original, it's meant for a video patched zx spectrum…

    ... - since it has all the voltages and amperages to power several ...
    Zetr0 Zetr0 August 2012 Hardware
  • Replacing ZTX650 with BD139Today I blew up one of the GALs on one of my DivIDEs while testing on my Toastrack. Shorted M1 with 12V and the 12V circuit broke. I had to replace T…

    ... it is still holding.
    Voltages seem ok with the exception ...
    Knik Knik September 2012 Hardware
  • Replacing ZTX650 with BD139Today I blew up one of the GALs on one of my DivIDEs while testing on my Toastrack. Shorted M1 with 12V and the 12V circuit broke. I had to replace T…

    Any transistor that does not get hot and that leads to the correct output voltages is ok. I used several different types as for example the SD349 (from former GDR) which works since many years without any problems.

    Greets Ingo.
    ingo ingo September 2012 Hardware
  • Needing new capacitors. Where to buy online?Hi. I need new axial capacitors for a whole bunch of Speccy boards I have. Problem is, it's been hard to buy some of them online. Some shops will onl…

    ... replacements tho as the exact voltages aren't to be found ... 6v will be 25V. Ultrarated voltages but at least if it ...
    pkersey pkersey September 2012 Hardware
<1…18192021222324…34>

Latest Posts

  • I am currently watching.....
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    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
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    mel the bell on April 21
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    harriusherbartio on April 21
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    harriusherbartio on April 21
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    mel the bell on April 20

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