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<1234567…34>
  • 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…

    ...
    [code]

    +5v -----/\/\/\/-----+------||------ 0v
    |
    |
    ... "looks" like a very low resistance. This means reset out will ... be right around 2.5v (and something like 4V ...
    Winston Winston September 2009 Development
  • 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 ... have any idea why the -5V would be missing (and the ...
    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…

    ... at the -5V. If there is a capacitor with low resistance your next ... there should be more than 5V because the 9V input voltage ...
    ingo ingo August 2012 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 …

    ... , this can only be no +5V or 0V supply to the ... CPU on pin goes from +5V to 0V and then back ... to +5V when the reset button is ... a multimeter, test using a low resistance range (0 to 200 ohms ... each data line to the +5V line, the 0V line, all ...
    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 …

    ... is to say, are the +5V, -5V and +12V supplies in the ... correct range.
    Is the +5V supply free of excessive ripple ... 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
  • Edge Connector InformationHi Everyone, Hope I'm posting in the correct forum. I've recently been playing with an Arduino and got to thinking it would be fab if I could do so…

    ... multimeter. Switch it to "the "low" resistance (Ohms) range (e.g. 200 ... pin 7. If you get +5V, it not only is suitable ... voltage of around +3V to +5V on these pins, again it ...
    1024MAK 1024MAK April 2014 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…

    ... (TR4) which then caused the -5V rail to fail, which may ... 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 …

    ... to switch it to a low resistance range and test each track ... with the meter. Note: all resistance tests are carried out with ... chip will drop too low, causing the 5V output to the logic ... check the voltage of the 5V supply (either on the regulator ...
    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 …

    Err, 5V digital logic does not like ... /> Use a multimeter on a low resistance range to confirm which connection ...
    1024MAK 1024MAK October 2015 Hardware
  • Harlequin 128K minor problems.....Hi All, I've just assembled my Harlequin 128K kit, I had initial problems with it that I traced to not having soldered all of the pins on a couple…

    ... µH in series to the 5V output of the DC-DC ... have very low resistance to avoid voltage drop on the 5V line.
    ingo ingo March 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…

    ... on C41 is missing or low (below 10V), renew C22 ( ... the board. Then test on resistance between TR8 (ZTX213) emitter ( ... connected to the +5V line) and TR8 collector (also ... />
    If you get a low resistance reading, renew TR8. You can ...
    1024MAK 1024MAK May 2017 Hardware
  • +3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…

    ... I am looking for, really.. 5v should always be high, right ... the behaviour of a rippling 5v line? +/- 2v? something like that ... on the PCB although low resistance, still have some resistance. And with an ... ripple and noise on the +5V supply should be below 100mV ...
    1024MAK 1024MAK July 2019 Hardware
  • +3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…

    ... I am looking for, really.. 5v should always be high, right ... the behaviour of a rippling 5v line? +/- 2v? something like that ... on the PCB although low resistance, still have some resistance. And with an ... ripple and noise on the +5V supply should be below 100mV ...
    colourclash colourclash July 2019 Hardware
  • Redesigning the ZX Spectrum 128k - A lifelong dreamHello, I am myPinballs (Jim) and i run a small business here in the uk making replacement 8-bit hardware pcbs for arcade pinball games as well as…

    ...
    • Power leds
    • Low power 5v regulator
    • Single 12v supply ...
    myPinballs myPinballs August 2016 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
  • 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 ...
    DEATH DEATH 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
  • Dead 48K Speccy.Blow this up as a child... thought I'd get it down from the loft and see if I can repair it. Upon power up, it displays this: [IMG]http://i266.photo…

    ... : check the voltages at low memory (5V, 12V, -5V) and see if there ...
    mcleod_ideafix mcleod_ideafix September 2009 Hardware
  • Dead 48K Speccy.Blow this up as a child... thought I'd get it down from the loft and see if I can repair it. Upon power up, it displays this: [IMG]http://i266.photo…

    ... 8~9V DC input, and 5V output (to be checked at ... Spectrum internally generates +12 and -5V from this (check at supply ... 4116 DRAMs - see schematic). The -5V isn't needed to obtain ... : check the voltages at low memory (5V, 12V, -5V) and see if there ...
    cycyc cycyc September 2009 Hardware
  • Help with broken SpectrumHi There, Just received a ZX Spectrum computer. It's an issue 3B (48k version). When I power it up (9V centre pin -V) nothing happens. It's complete…

    ... /> Pin 9 (low right) = +5V
    Pin 1 (upper left) = -5V
    Pin ...
    RetroTechie RetroTechie September 2010 Hardware
  • 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
  • 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…

    ... 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 …

    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
<1234567…34>

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