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  • Dead Spectrum+Hi! Any suggestions where to start finding what's broken: Spectrum+ with issue 6A motherboard and nothing on TV. Top row of the upper memory chips g…

    ... 'd start CHECKING for bad voltages before replacing anything. Take into ... if this is absent, no voltages will be generated even if ...
    mcleod_ideafix mcleod_ideafix September 2011 Hardware
  • TV is on the blink - litterally.My TV has gone on the blink. Its a Philips Matchline 32" CRT (See image below). When I turn it on the sound comes on, it makes the usual Bzzzt of th…

    ... power supply (CAUTION, very high voltages can be present in some ...
    Winston Winston September 2011 Chit chat
  • TV is on the blink - litterally.My TV has gone on the blink. Its a Philips Matchline 32" CRT (See image below). When I turn it on the sound comes on, it makes the usual Bzzzt of th…

    ... =Winston;566176](CAUTION, very high voltages can be present in some ...
    guesser guesser September 2011 Chit chat
  • Speccy 2010 UpdateI've made myself a to Speccy 2010. In addition to TurboSound (2xAY) it adds SounDrive and Covox support. Supported modes are SounDrive Mode 1, SounDr…

    ... AY implementation, based on the voltages gasman measured eons ago, and ...
    csmith csmith October 2011 Announcements
  • Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…

    ... .

    But if those voltages aren't good, chances are ... you focus on restoring those voltages before trying further tests. The ...
    RetroTechie RetroTechie October 2011 Hardware
  • The development of (possibly) the worst car in the world...which is of course the Morris Marina. For some reason, YouTube gave me this as a suggested video (I don't know why!). It was interesting at least.…

    ... , it's no Spitfire or TR6, but I wouldn't have ...
    ccowley ccowley October 2011 Chit chat
  • The development of (possibly) the worst car in the world...which is of course the Morris Marina. For some reason, YouTube gave me this as a suggested video (I don't know why!). It was interesting at least.…

    ... , it's no Spitfire or TR6, but I wouldn't have ...
    Scottie_uk Scottie_uk October 2011 Chit chat
  • ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…

    ... the 5v supply, the other voltages are only needed by non ...
    r0jaws r0jaws October 2011 Hardware
  • Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…

    ... :[LIST]
    [*]Check internal supply voltages (+5, +12, -5V), just to ...
    RetroTechie RetroTechie October 2011 Hardware
  • Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…

    what sort of pattern?

    Have you gone through the steps in the repair guide to isolate the lower ram so you can test the supply circuits? If so are you getting all three voltages correct now?
    guesser guesser October 2011 Hardware
  • Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…

    ... /> Yep I just checked the voltages on all the 4116 chips ...
    absinthe_boy absinthe_boy October 2011 Hardware
  • Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…

    ... ]Yep I just checked the voltages on all the 4116 chips ...
    guesser guesser October 2011 Hardware
  • black +2 go awayHi, All what is my problem if i have the proper voltages inside my black Spectrum +2 black (+5v+12v) in all the important IC's , and not have any vi…

    ... big problem this time have voltages and nothing more ...... :) may be ...
    gorski gorski October 2011 Hardware
  • Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…

    ... 4116s are very sensitive to voltages.
    It could also be ...
    Spirantho Spirantho October 2011 Hardware
  • Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…

    You're right about the voltages, of course - the power circuit ...
    Spirantho Spirantho October 2011 Hardware
  • Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…

    Point taken regarding the multiple voltages generated prior to the 5v ...
    mcnaugg mcnaugg October 2011 Hardware
  • Merging romsHello, I want to flash an eprom with two roms so I can make a speccy be able to have a dual rom using an external switch. I thought i had it right b…

    My willem had always issues with voltages on ZIF socket. Probably I should return it to seller, but I left it to fix it myself. Then.... It was easier to get new better programmer :grin:
    kpuchatek kpuchatek November 2011 Hardware
  • Merging romsHello, I want to flash an eprom with two roms so I can make a speccy be able to have a dual rom using an external switch. I thought i had it right b…

    ... willem had always issues with voltages on ZIF socket. Probably I ...
    gtsamour gtsamour November 2011 Hardware
  • Merging romsHello, I want to flash an eprom with two roms so I can make a speccy be able to have a dual rom using an external switch. I thought i had it right b…

    ... stated that faulty (or unstable) voltages are directly related to:
    Zup Zup November 2011 Hardware
  • Merging romsHello, I want to flash an eprom with two roms so I can make a speccy be able to have a dual rom using an external switch. I thought i had it right b…

    If you read EZO forum, there are a lot of issues with incorrect voltages on Willem. My Willem has only 12V power supply, but DC-DC converter, yes it could be source of problems. Maybe one day I will give it a look again.
    kpuchatek kpuchatek November 2011 Hardware
  • Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…

    ... Speccy is running with this Voltages far away from the specification ... degraded over time to change voltages but the Speccy still running ...
    maskenlos maskenlos December 2011 Hardware
  • Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…

    ... the lower RAM when supply voltages are off (especially -5V).
    RetroTechie RetroTechie December 2011 Hardware
  • Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…

    ... will it clean up the voltages, it'll make the display ...
    Spirantho Spirantho December 2011 Hardware
  • Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…

    ... be nice to know the voltages over T60 and T61, and ...
    roko roko December 2011 Hardware
  • Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…

    ... , roko let me update the voltages on Friday to you. But ...
    maskenlos maskenlos December 2011 Hardware
  • Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…

    ... the pulsating nature of the voltages no real meaning can be ...
    roko roko December 2011 Hardware
  • Opus Discovery issues!All happens at once when things go wrong eh? This time its the dual drive Opus, neither drive will read/write, motor spins, when formatting you can …

    ... /connections the +5 and +12 voltages should be checked for correct ...
    roko roko December 2011 Hardware
  • Opus Discovery issues!All happens at once when things go wrong eh? This time its the dual drive Opus, neither drive will read/write, motor spins, when formatting you can …

    ... /connections the +5 and +12 voltages should be checked for correct ...
    bverstee bverstee December 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... works perfectly. So, either timings/voltages in the Spectrum+ just happen ...
    Zorn Zorn December 2011 Hardware
  • Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…

    ... . Here we go for the voltages:

    R60, 100 ohm ...
    maskenlos maskenlos December 2011 Hardware
<1…15161718192021…34>

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    John Elliott on April 21
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