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Search Again :: Adv Search 1000 results in 0.009s
<1234567…34>
  • 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 ... ). There should be some rather low resistance. If there's no connection ... PSU. If it gives approx 12V, the hole in the plug ...
    DEATH DEATH May 2007 Hardware
  • Diagnosing Spectrum 48k (faulty RAM chip?)I have a Spectrum 48k (I believe it may be an upgraded 16k model) that doesn't work, and never has ever since the owner gave it to me. When you turn …

    ... that Ameters had to have low resistance and Voltmeters had to have ... high resistance, I just didn't realise ... would be missing (and the +12V a little too low)?
    Muzer Muzer November 2009 Hardware
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... about 2.3V at the 12V line then I would ... capacitors 100?F at the 12V line and 22?F ... there is a capacitor with low resistance your next transistor TR4 will ... the Spectrum then at the 12V line there should be more ... Check if Diode D15 (in 12V line) acts as diode.
    ingo ingo August 2012 Hardware
  • Opus discovery problemTook delivery of another of these today, bad drives but I got one working, a further issue developed after I plugged a Multiface into the Opus's expa…

    ... the basics: check +5 and +12V on centre pins of the ... edge connector pins for shorts/low resistance to ground.

    Since ... the Opus PCB is really low and it is very easily ...
    Falco-F8L Falco-F8L May 2013 Hardware
  • Keyboard has a life of its own?I just received a Spectrum+ Issue 4S, where I had to replace the MIC connector and I also did the Composite mod. So far it works just fine, but when …

    ... , are the +5V, -5V and +12V supplies in the correct range ... the diode test range (or low resistance range if you don't ... .6 to 0.7V (or low resistance reading) the other way you ...
    1024MAK 1024MAK August 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…

    ... you. That is, measure resistance between +12V and ground (probe both ... If you find a very low resistance on +12V, then desolder briefly C41 ... if you have still very low resistance. If yes, then IC3 ... If you find a very low resistance on 112V, then desolder briefly ...
    Falco-F8L Falco-F8L October 2013 Hardware
  • 'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…

    ... for low resistance on the +12V and -5V rails. Investigate any low resistance readings. Replace ...
    1024MAK 1024MAK September 2014 Hardware
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... digital logic does not like 12V DC (or AC for that ... /> Use a multimeter on a low resistance range to confirm which connection ...
    1024MAK 1024MAK October 2015 Hardware
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... is the one for the 12V regulator. So it should be ... you are looking for a low resistance of 3 ohms or less ...
    1024MAK 1024MAK October 2015 Hardware
  • 128 +2 grey, no video but still beepsGot a grey 128 from ebay, im using a 48k spectrum powers supply, all voltages seem ok. I cant get compostie video using the normal mod or from the 8…

    ... voltage for video. The input resistance is in the kilo ohm ... higher than 9V (up to 12V) to be sure that the ... 16:9 signal. Therefore a low resistance for R15 is needed to ... avoid low voltage. Normally R15 could be ...
    ingo ingo February 2016 Hardware
  • Toastrack - faint monochrome displayHi all, I've got a Toastrack with a video issue on both RGB and RF. I get a faint monochrome screen: on one LCD display it is predominately white,…

    ... show up as a small resistance, so that's fine. It ... should check is for low resistance reading between the +12V line and ground ... and the MC1488 use the +12V supply. It's also present ... on the video connector. The -12V supply generated by the voltage ...
    Peter Mulholland Peter Mulholland February 2017 Hardware
  • No video output from Spectrum +2 (light grey)Got a strange issue with my Spectrum +2 light grey edition. It was working fine then all of sudden it outputs a black screen while I was using it wit…

    Check the +12V supply to IC2 (TEA ... see if you have +12V on the positive leg of ... +12V, remove TR9 from the board. Then test on resistance between ...
    If you get a low resistance reading, renew TR8. You can ... test the machine, the +12V rail will be back and ...
    1024MAK 1024MAK May 2017 Hardware
  • TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…

    ... board (i.e. just a low resistance rather than a true short ...
    Winston Winston 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 ... ). There should be some rather low resistance. If there's no connection ...
    Sonic Sonic May 2007 Hardware
  • AudiophoolsGood grief, there must be some really gullible audiophiles about if Denon is selling this: [url]http://www.usa.denon.com/ProductDetails/3429.asp[/ur…

    ... headphones with some kind of low resistance tungsten cable and gold plated ...
    dm_boozefreek dm_boozefreek June 2008 Chit chat
  • AudiophoolsGood grief, there must be some really gullible audiophiles about if Denon is selling this: [url]http://www.usa.denon.com/ProductDetails/3429.asp[/ur…

    ... headphones with some kind of low resistance tungsten cable and gold plated ...
    GreenCard GreenCard June 2008 Chit chat
  • Gone!!I'm outa here. [IMG]http://www.comp.glam.ac.uk/pages/staff/asscott/Pictures/EmptyDesk.jpg[/IMG] Hopefully I'll be back soon.

    ... , but the volume is very low and it doesn't ring ... setting (the frequency is fairly low though, about 18Hz or so ... whether the solenoids have appropriately low resistance across their coils. Also note ...
    Winston Winston September 2008 Chit chat
  • The Goldfinch updates thread([url=http://www.worldofspectrum.org/forums/showthread.php?t=25034]original announcement thread here[/url] - I figured it was worth starting a new to…

    ... , and "looks" like a very low resistance. This means reset out will ... zero volts. Reset is active LOW for pretty much any chip ... the threshold voltage is quite low, around 1.8 volts or ...
    Winston Winston September 2009 Development
  • Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…

    Any ideas what could be causing the low resistance problem for IC6-IC13, and will this be my display problem? Could it be TR5 having a lower voltage than the others? Or possibly a failed C46?

    Anyone?
    kamilb1998 kamilb1998 February 2012 Hardware
  • TR4 continues blowing up!The TR4 of my Speccy Issue 3 continues burning even after I changed all electrolytic capacitors and the BA157 diode. If these things serve only to h…

    ... your DMM to a lowish resistance range and measure across the ... most common cause of a low resistance reading here is TR4 failing ...
    Zorn Zorn May 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…

    ... own multimeter. And measured the resistance towards ground of all Z80 ... was found, which is the low resistance on the MEMRQ line. This ...
    roko roko June 2012 Hardware
  • Kempston Joystick on Pentagon 128As most of you know, I'm currently in the process of building a Pentagon 128, good news first, almost everything is working nicely, except for the ke…

    ... /> I guess that the too low resistance connected to the GND was ...
    TK90XFan TK90XFan March 2013 Hardware
  • Spectrum 128K +2 problemhello, i am try to repair my spectrum 128k +2 grey, i remove all ram chips and i have some new ones spares, now i have remove all ram chips, i want …

    ... a multimeter, test using a low resistance range (0 to 200 ohms ... you are looking for a low reading, between 0 ohms and ... , switch the meter to higher resistance range (say 20k) and test ... readings. If you get a low reading (say less than 100 ...
    1024MAK 1024MAK March 2013 Hardware
  • Keyboard has a life of its own?I just received a Spectrum+ Issue 4S, where I had to replace the MIC connector and I also did the Composite mod. So far it works just fine, but when …

    In the past one described an error on a spectrum board that was caused by low resistance between copper lines of the PCB. Maybe measuring the resistance between lines in the neighborhood of the KB0 line could help.

    Ingo.
    ingo ingo August 2013 Hardware
  • Op-amp question for the more knowledgeable tech headI have a dual op-amp IC in a 9 pin SIL package. Pin 1 and 9 are Vcc as marked on the datasheet. The internal schematic as supplied on the datasheet…

    ... just going on the internal resistance between the Vcc pins 1 ... to be separate, then any low resistance would be too much? The ...
    roko roko August 2013 Hardware
  • Op-amp question for the more knowledgeable tech headI have a dual op-amp IC in a 9 pin SIL package. Pin 1 and 9 are Vcc as marked on the datasheet. The internal schematic as supplied on the datasheet…

    ... be separate, then any low resistance would be too much? ... and 9, and no resistance is shown between them. ... Yes I have measured the resistance "both ways" to make ... have factored in the resistance of my test leads. ... 've even tested the resistance with a second meter, ...
    DEATH DEATH August 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…

    ... a short, or a very low resistance, on the component itself and ... you still have the same low reading, then you know the ...
    Falco-F8L Falco-F8L October 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…

    ... the resistance between the connections of the same winding is low, ... winding, you will get a low resistance reading.

    Unless ... meter designed for measuring low resistances and you have ... should get a very high resistance reading (most likely higher ...
    1024MAK 1024MAK October 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... , the +5V, the +12V and the low current -12V all have return paths ... the 0V/GND (less the +12V / -12V difference current flow that can ...
    1024MAK 1024MAK December 2013 Hardware
  • IF1bis StabilityI just thought I would start a different thread relating to the IF1bis, and leave the copyrighters to it elsewhere...:-P I've had mine for a few mon…

    ... in damp conditions causing a low resistance between adjacent contacts.

    1024MAK 1024MAK January 2014 Hardware
<1234567…34>

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