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<1…16171819202122…34>
  • Snow on screen of 48K Speccyok you wizards I fixed up my 4116 ram issue as Winston and McLeod advised me before by replacing with 4164's.... all I could find here in Singapore (…

    ... enough stable power supply of +12v, maybe because those ceramic ICs ...
    8bitchip 8bitchip October 2009 Hardware
  • Snow on screen of 48K Speccyok you wizards I fixed up my 4116 ram issue as Winston and McLeod advised me before by replacing with 4164's.... all I could find here in Singapore (…

    ... to suggest the +12v line seems wrong - the 12v line in my ...
    nuggetreggae nuggetreggae October 2009 Hardware
  • Another set of USA newbie ZX Spectrum questions.So yeah, I'm considering getting a ZX Spectrum 48k pretty soon, but since I'm not in the country of origin, I have a few questions about it. First, …

    ... used by the +2A. The -12V aren't necessary unless I ...
    zxbruno zxbruno November 2009 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 …

    I've just measured the internal voltages as per the service manual on this site, and both points that are supposed to be 12V actually measure around 10V - would this be the cause of my problem? Which component is to blame?
    Muzer Muzer November 2009 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 …

    ... mode supplies). You should have +12v, +5v and -5v available on ...
    Winston Winston November 2009 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 …

    ... to pin 16 must read +12v
    voltage of pin 9 ...
    Nuno2009 Nuno2009 November 2009 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 …

    ... would be missing (and the +12V a little too low)?
    Muzer Muzer November 2009 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 …

    ... ).

    The lower-than-12v suggests that something is loading ...
    Winston Winston November 2009 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 …

    ... =Winston;398708]The lower-than-12v suggests that something is loading ...
    RetroTechie RetroTechie November 2009 Hardware
  • Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…

    ... br /> The +2B needs +5V, +12V and, if memory serves me ... well, -12V. The only critical voltage here ... is +5V. +12V is used to feed the ... the RS232 line converters. -12V is used for RS232 ... power jack to take +12V also from the monitor, ...
    mcleod_ideafix mcleod_ideafix December 2009 Hardware
  • Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…

    the CD32's PSU is +5v/+12v/-12v definitely needs to hack the (DC) socket...
    the C64's PSU is +5v/9v-AC not suitable for any speccy.


    chris
    xc8 xc8 December 2009 Hardware
  • Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…

    Hmmmm, I've found I also needed the +12V to get an RGB display on my +3 - my PSU had a bad connection on the 12V line, and every time it died, so did the display (although the rest of the computer - except the floppy drive - continued to work).
    Winston Winston December 2009 Hardware
  • Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…

    Yes, -12v is also required to power the floppy drive. That's the reason for the -12v 700mA required in +3 power source (vs 200mA in +2A).

    Why not using a "hacked" PC power source?
    Zup Zup December 2009 Hardware
  • Trying to repair a 128K (heatsink)I've bought another ZX Spectrum 128K (heatsink model), but unfortunately the last owner did not tell me it did not work.... Because this Speccy also…

    Are the +12V and -12V and -5V present as well ?
    Pilsener Pilsener December 2009 Hardware
  • Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…

    ... found I also needed the +12V to get an RGB display ... /> I can't see why 12V is really needed to form ... picture... unless your TV needs 12V from the RGB DIN socket ...
    mcleod_ideafix mcleod_ideafix December 2009 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 …

    ... read a value of 680 mV for one of the Spectrum ...
    roko roko December 2009 Hardware
  • memory chips spectrum +Hi with regards to memory chips the ones in there are tms4116 in the lower memory.there is some on ebay MCM4116BP20 can i mix these with tms ones or …

    ... chip needs -5V, +5V and 12V and a common fault is ... that creates the -5V and +12V supplies fails. There are instructions ...
    zx2628 zx2628 January 2010 Hardware
  • need help with +3 sound mod..well my friend has been doing the mod.. and well informed me the info / instructions aren't 100% there.. basically the matrix of cap's / resisters i…

    ... already use one to supply 12v for my RGB->SVIDEO ...
    nuggetreggae nuggetreggae January 2010 Hardware
  • Spectrum +2A -Black screen-When I turn on the power I get only black screen (full size) PSU is working (I even tried with my +3 PSU) RF-cable is working. What could be the pro…

    Are you getting the right voltages from the power supply? If the 12V is absent, you'll get a black screen.
    Winston Winston January 2010 Hardware
  • Spectrum 48k - Many ProblemsHi, I'm new to the boards and to owning a Spectrum, and sadly, it doesn't work properly. I'd been using an emulator for a while but I decided I'd lik…

    ... these chips (+5v, -5v and +12v). If the -5v supply has ...
    Winston Winston January 2010 Hardware
  • Spectrum 48k - Many ProblemsHi, I'm new to the boards and to owning a Spectrum, and sadly, it doesn't work properly. I'd been using an emulator for a while but I decided I'd lik…

    48K needs the internally generated 12V to produce video.
    roko roko January 2010 Hardware
  • ZX Spectrum Power SupplyHi All, I've come across a power supply that is currently registering 14.5v before it is plugged into the Speccy. I have another one that registers…

    ... necessary. ;)

    The nominal 12V input is a "sweet spot ...
    RetroTechie RetroTechie February 2010 Hardware
  • zx spectrum 128K+2(gray)-vanishing colorsHi, I just got "new" zx spectrum 128k+2(gray) made in uk version. Beside tape dead and memory issue - only first 16k RAM works in 48k mode, it has s…

    ... colors can be TEA2000 or... +12V line issue. But I'm ...
    kpuchatek kpuchatek February 2010 Hardware
  • ZX Spectrum Power SupplyHi All, I've come across a power supply that is currently registering 14.5v before it is plugged into the Speccy. I have another one that registers…

    ... produces -5v and +12v for the ram, and +12v for the Colour ... run a speccy off a 12v car adapter (The car wasnt ...
    spodula spodula February 2010 Hardware
  • PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…

    ... adapters don't have the -12v, it's not absolutely necessary ... . I think the -12v is only needed for rs232 ...
    zxbruno zxbruno February 2010 Hardware
  • PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…

    ... use different voltages (5V and 12V). How can I use a ...
    groove groove February 2010 Hardware
  • PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…

    Can I take the cables of a 24 pin connector from a PC PSU like this [url]http://pinouts.ru/Power/atxpower_pinout.shtml[/url] and connect the +12V,+12V,-12V,5V,GND cables to the 6 pin connector? thanks
    groove groove February 2010 Hardware
  • PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…

    ... .shtml[/url] and connect the +12V,+12V,-12V,5V,GND cables to the ...
    zxbruno zxbruno February 2010 Hardware
  • PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…

    But the +12V of the PC PSU works @12A +5VDC @25A . Wont the intensity of corrent blow with the spectrum?
    Spectrum actually works with +12V @ 0.7A and +5V@ 2A, it's very lower.
    groove groove February 2010 Hardware
<1…16171819202122…34>

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