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<1234567…34>
  • Faulty rubber speccy - advice neededHello all speccy hardware gurus :) Recently I moved to a new flat and after a long time have some space (and time) to dig out my old Speccy hardware…

    ... for the IC7 where the resistance on the pin 2 was ... to manual, I checked the resistance on leg 2 of the ... ), and the manual suggests to measure resistance of legs 2 and 14 ... of the socket and the resistance is out of my instrument ...
    deckard deckard January 2012 Hardware
  • Determining +3 revisionI have two +3's and have only just got around to inspecting the insides to look for the known +3 sound "bug". The problem is that one machine appear…

    Fast method... locate TR5 and measure resistance between GND and the upper ...
    Zup Zup March 2010 Hardware
  • Determining +3 revisionI have two +3's and have only just got around to inspecting the insides to look for the known +3 sound "bug". The problem is that one machine appear…

    ... ]Fast method... locate TR5 and measure resistance between GND and the upper ...
    brownb2 brownb2 March 2010 Hardware
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    ... out by the meter to measure resistance seems to be lower than ... has bearing on the resistance that you measure at the -5V line ...
    roko roko January 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…

    ... by desolder one end, then measure resistance with DMM, in the right ... up basically to infinity in resistance as the cap is charging ...
    Johan1973 Johan1973 August 2012 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... had your meter set to measure resistance rather than to the diode ... the diode test mode to measure the voltage drop.

    Zorn Zorn April 2013 Hardware
  • One more grey +2 with video problemsI guess I need your help again to hopefully be able to do some proper troubleshooting myself one day. Here I have a grey +2, which could be a bottom…

    ... 1024MAK suggested you. That is, measure resistance between +12V and ground ( ... Then, measure coil T1, not only for continuity and resistance, but ... you find a very low resistance on +12V, then desolder ... you find a very low resistance on 112V, then desolder ...
    Falco-F8L Falco-F8L October 2013 Hardware
  • Finally got round to itFinally got round to giving my old speccy a close look. Details 1982 Issue 2 Seriel No 001 196193 Hmm... Followed the initial tests on You tube w…

    Measuring components on the resistance range (with the component/board ... the meter actually measures the resistance (limited voltage or limited ... current the meter uses to measure resistance and of course the ... to show up on a resistance test (well, unless you ...
    1024MAK 1024MAK February 2015 Hardware
  • Dead 48k and +2I have a couple of questions. My old 48k had a very wobbly power socket so bought a new one and soldered it on. It will not work at all now? Is ther…

    ... This is called resistance. Most multimeters can measure resistance. The units ... gear designed to measure Voltage, Current and Resistance.

    measure the resistance of the circuit.
    measure the voltage. Electronic ...
    1024MAK 1024MAK January 2016 Hardware
  • Harlequin 48k and 128kHi all i have been putting together a harlequin 128k and have a few components assembled on the board including some sockets and today arrived the…

    ... decoupling capacitors. Then I would measure resistance between +5V and GND lines ...
    Claudius Claudius March 2017 Hardware
  • In-game Screen FlickeringHi folks, today while playing 'Beyond the Ice Palace' I noticed strange behavior of my Issue 6a Spectrum+. When I pressed '2' (for UP) + 'O' (for …

    ... has to be unpowered to measure resistance, because it's actually putting ... get odd things like negative resistance, which is obviously not possible ... 6k.

    Can you measure it unpowered without the keyboard ...
    RobeeeJay RobeeeJay September 2017 Hardware
  • 48k Issue 6a Very sick indeed.Hi Guys. I have a 48k Issue 6a board that shows a white screen with grey border. The white screen has three black squares spaced equally on the le…

    Measure resistance between GND and all power lines, and between all power lines. In every case the reading should be 1k Ohms or above.

    It would be worth checking TR5 and diodes (D15 & D17) in +12V section.
    Claudius Claudius October 2017 Hardware
  • What resistance should primary of a mains toroidal transformer measure?Not speccy related but still hardware. I am fixing a dual audio mixer at work. When you plug it in it blows the mains fuse straight away. Opening u…

    ... and I measured its primary resistance and got 400ohms. Checking the ...
    IN31 IN31 May 2008 Hardware
  • Midnight Resistance (missing artist)[URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0003188"]Midnight Resistance[/URL] CHAS in the lower left. [img]http://www.worldofspectrum.o…

    [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0003188"]Midnight Resistance[/URL]

    CHAS in the lower left.

    [img]http://www.worldofspectrum.org/showscreen.cgi?screen=screens/load/m/gif/MidnightResistance.gif[/img]
    ZnorXman ZnorXman October 2009 Infoseek database
  • Another question on solderingWell, I thought of creating a cool little input device much like this one: [url]http://www.instructables.com/id/HDDJ_Turning_an_old_hard_disk_drive_…

    ... surface, it's possible to measure the resistance. I measured it, it ...
    wilsonsamm wilsonsamm January 2010 Chit chat
  • CPU speed measure possible?Is it possible to measure the CPU speed and shows the result on a LED display? Micky

    Is it possible to measure the CPU speed and shows the result on a LED display?


    Micky
    -Micky -Micky May 2010 Hardware
  • Need help on a PSUI want one of these to go with a speccy 48: [url]http://cgi.ebay.co.uk/NEW-ZX-SPECTRUM-POWER-SUPPLY-PSU-16K-48K-SINCLAIR-/170630125650?pt=UK_VintageC…

    ... am correct? EDIT: I could measure the resistance over the 'chopped' area ... and that would give me a resistance ...
    Van_Dammesque Van_Dammesque April 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…

    ... new regulator I can now measure +5V at all the RAM ... /> (exactly the same as I measure for -5V on a working ... ULA, with the expected 470ohms resistance in them between the CPU ...
    ULA. They also all measure ~5.5Kohms to the +5V ...
    Zorn Zorn November 2011 Hardware
  • Souce Code for Midnight ResistanceI just saw this on ebay and was wondering if this was the real deal. Does anyone know ? [url]http://www.ebay.co.uk/itm/Sinclair-ZX-Spectrum-Midnight…

    ... /itm/Sinclair-ZX-Spectrum-Midnight-Resistance-Source-Code-Jim-Bagley-/110778560627 ...
    morcar morcar January 2012 Games
  • Spectrum +3 FavourCan a kind soul with a multimeter and a +3 measure the resistance on the power socket between the 5V and the ground? I have a dead +3 that only has 0…

    ... multimeter and a +3 measure the resistance on the power socket between ... the PSU brick, knowing the resistance across a working +3 will ...
    Womble Womble June 2012 Hardware
  • Midnight ResistanceHey guys & gals How good was Midnight Resistance!! I wonder if you'd like to check out this review by WOS member florinthedwarf [URL="http://www.r…

    ... />
    How good was Midnight Resistance!!
    I wonder if you ... ="http://www.retroyak.com/midnight-resistance-zx-spectrum-arcade-conversion/"]http ... ://www.retroyak.com/midnight-resistance-zx-spectrum-arcade-conversion/[/URL ...
    RetroYak RetroYak August 2014 Games
  • RESISTANCE: new adventureSomething a bit different from my previous AGD games: this one's a text adventure! I was inspired to fire up The Quill for the first time in 30+ year…

    ... back to me...

    RESISTANCE is set in Nazi-occupied ... prove your worth to the Resistance and fight back against the ...
    Payndz Payndz January 2019 Brand new software
  • 48K Speccy not workingHey, A few months ago (hope it&#180;s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…

    ... it's absent, check the resistance of primary transformer coil (put ... in ohm-meter mode and measure the resistance between AC plug contacts ... should be some rather low resistance. If there's no connection ... to the AC power and measure voltage on a secondary ...
    Sonic Sonic May 2007 Hardware
  • 48K Speccy not workingHey, A few months ago (hope it&#180;s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…

    ... it's absent, check the resistance of primary transformer coil (put ... in ohm-meter mode and measure the resistance between AC plug contacts ... should be some rather low resistance. If there's no connection ... to the AC power and measure voltage on a secondary ...
    DEATH DEATH May 2007 Hardware
  • 48K Speccy not workingHey, A few months ago (hope it&#180;s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…

    ... [/url]
    We need to measure voltages between pins 3 and ... +5V.
    Alternatively you may measure between pins 9 and 16 ... capacitor will strongly have zero resistance. This can be quickly verified ...
    Sonic Sonic May 2007 Hardware
  • Does anyone else find Dan Brown suspect?Don't get me wrong, he's a good entertaining [i]fiction[/i] writer -- as long as the emphasis is on "fiction"; unfortunately, he has the annoying hab…

    ... "; but ohms are a measure of electrical resistance, not of magnetic flux ...
    robert@fm robert@fm May 2007 Chit chat
  • Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…

    ... 't be possible to just measure the resistance of one of them ...
    gtsamour gtsamour July 2007 Sales
  • Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…

    ... 't be possible to just measure the resistance of one of them ...
    DEATH DEATH July 2007 Sales
  • What resistance should primary of a mains toroidal transformer measure?Not speccy related but still hardware. I am fixing a dual audio mixer at work. When you plug it in it blows the mains fuse straight away. Opening u…

    primary resistance should be very low, in ... , you're only measuring the resistance of a few tens of ... /> what you need to measure is the resistance between the primary and ...
    bleugh bleugh May 2008 Hardware
  • Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…

    ... /repair2/rep_spec.html[/url]
    Resistance between pin 1 of IC6 ... to the right of C4, resistance remained approx 5kOhm. Pin 8 ... resistors seems discoloured, I'll measure them tomorrow.
    After replacing ...
    65C02 65C02 June 2008 Hardware
<1234567…34>

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Related Threads

  • What resistance should primary of a mains toroidal transformer measure?Not speccy related but still hardware.<br /> <br /> I am fixing a dual audio mixer at work. When you plug it in it blows the mains fuse straight away…
  • Midnight ResistanceAnyone else a fan of this great game ?<br /> <br /> For some reason when i tried it ages ago i just didnt like it, played the arcade version which i…
  • Midnight Resistance (missing artist)[URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0003188"]Midnight Resistance[/URL]<br /> <br /> CHAS in the lower left.<br /> <br /> [img]http…
  • CPU speed measure possible?Is it possible to measure the CPU speed and shows the result on a LED display?<br /> <br /> <br /> Micky
  • Souce Code for Midnight ResistanceI just saw this on ebay and was wondering if this was the real deal. Does anyone know ?<br /> <br /> [url]http://www.ebay.co.uk/itm/Sinclair-ZX-Spect…
  • Spectrum 4 Ever : Midnight Resistance[url]https://www.youtube.com/watch?v=NC2ts8CbSWI[/url]
  • Midnight ResistanceHey guys &amp; gals<br /> <br /> How good was Midnight Resistance!! <br /> I wonder if you'd like to check out this review by WOS member florinthedwa…
  • RESISTANCE: new adventureSomething a bit different from my previous AGD games: this one's a text adventure! I was inspired to fire up The Quill for the first time in 30+ year…

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