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  • 48k dots appear but not with CUB monitorToday I tried out an issue 3 and an Issue 2 with the CUB monitor, to my surprise they both worked flawlessly, now before when I tried them on any oth…

    ... isolation between AC and DC voltages.

    On the other ...
    mcleod_ideafix mcleod_ideafix June 2011 Hardware
  • 48k dots appear but not with CUB monitorToday I tried out an issue 3 and an Issue 2 with the CUB monitor, to my surprise they both worked flawlessly, now before when I tried them on any oth…

    ... stray current may create unwanted voltages somewhere. But such is rarely ...
    roko roko June 2011 Hardware
  • Dead 128 ToastrackHi! I bought 128 toastrack motherboard and seller said it's working. Maybe it was when he sent it but motherboard was only put into envelope. So it …

    ... multimeter so you can check voltages.

    I would start ...
    Zetr0 Zetr0 June 2011 Hardware
  • rubber key Spectrum 48k problem :(when i plug the spectrum in all i get is a black screen with a red border and sometimes flashing blocks. the spectrum worked until about 20 mins ago…

    ... is [i]always[/i] the voltages on the 16K lower RAM ... still don't get the voltages, turn the machine off [i ... /> If you get the correct voltages, it may boot. If it ... no hot chips, and all voltages are good, chances are you ...
    Spirantho Spirantho June 2011 Hardware
  • Microdrive using simple coilWhile listening to my iPod using cassette car adapter I came to idea - why not doing the same for the microdrive? Anyone ever tried that? Do you thin…

    ... wires, two coils, understanding the voltages involved and something like this ...
    tstih tstih July 2011 Hardware
  • Got a PC to mend, need some opinionGot this PC in yesterday to mend, what happened was after a load of updates and after a complete shutdown, the next day he goes to turn it on and rig…

    ... give out all the possible voltages, and some people think they ...
    zxbruno zxbruno July 2011 Chit chat
  • Spectrum not working, can anyone help this lady?[URL="http://www.retrogamer.net/forum/viewtopic.php?f=6&t=29734#p674152"]http://www.retrogamer.net/forum/viewtopic.php?f=6&t=29734#p674152[/URL]

    ... 4116 DRAM's and measure voltages at the three rail pins ...
    mcleod_ideafix mcleod_ideafix July 2011 Sinclair Miscellaneous
  • +2/+3 Sync problem on Commodore 1084sI have a strange issue, I got an RGB monitor cable from ebay for the +2/+3 to the Commodore 1084s (d-sub socket). It works fine on my Spectrum+ 128k …

    ... composite sync, which drops the voltages down a bit I guess ...
    RobeeeJay RobeeeJay July 2011 Hardware
  • Composite spectrum problemHowdy, Found an old rubber key in a bag full of games recently which had seen better days. Rigged it up and to my suprise it worked! It needed som…

    ... wire, because these are low voltages in the modulator, nothing that ...
    Hedegaard Hedegaard July 2011 Sinclair Miscellaneous
  • Composite spectrum problemHowdy, Found an old rubber key in a bag full of games recently which had seen better days. Rigged it up and to my suprise it worked! It needed som…

    ... (one of) the powerlines. Checking voltages (-5, +5, +12) might be ...
    roko roko July 2011 Sinclair Miscellaneous
  • Composite spectrum problemHowdy, Found an old rubber key in a bag full of games recently which had seen better days. Rigged it up and to my suprise it worked! It needed som…

    ... (one of) the powerlines. Checking voltages (-5, +5, +12) might be ...
    LCD LCD July 2011 Sinclair Miscellaneous
  • Power Supply fuse ratingHi, I've hunted about a good bit but not been able to track down any info, so: I am sorting out my spectrum power supplies just now and want to mak…

    ... +3 power supply offers three voltages (+5v, +12v and -5v), and ...
    Zup Zup July 2011 Hardware
  • try to fix issue 4 board problemHi I try to fix speccy 48. All voltages are in place, ula 100% ok, cutted +5v from ic25 so far no luck. What next? ROM or upper memory? wojtek (i…

    If voltages ok, then 4116 lower 16K memory (most likely) or ROM.

    It's tricky to tell.... Do the 4116's get hot?
    csmith csmith August 2011 Hardware
  • Help with Spectrum 128k reparationHi! I have the following symptoms with a 128k unit version 6U - On power on, black and white bars (one char width each), white background - Once po…

    ... was working fine), and measure voltages at the edge connector, everyone ... />
    I want to measure voltages on the RAM, but it ...
    kwyjibo kwyjibo September 2011 Hardware
  • 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…

    Try to replace ULA with working one. Working low memory should be enough to see the screen. Check all voltages. Hot RAM = bad, probably.
    kpuchatek kpuchatek September 2011 Hardware
  • 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
  • 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
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