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<1…16171819202122…34>
  • Trouble with Spectrum 48kI think it is a Rev 3 (Issue 3 on the motherboard). The screen has weird characters, instead of text, and the keyboard is not responding (although it…

    ... a ZTX651, restoring the -5v line. 12v line now has a value ... closer to 12v.

    But I still ...
    kwyjibo kwyjibo September 2009 Hardware
  • Any help appreciatedHello, I notice that people have posted their PC related hardware and software woes on this forum before and the more technically minded among you h…

    ... their correct voltage. red=5v and yellow=12v. this isn't conclusive ...
    freddyhard freddyhard September 2009 Chit chat
  • 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 -5v
    voltage of pin 8 ... to pin 16 must read +12v
    voltage of pin 9 ... to pin 16 must read +5v

    the memory ICs ...
    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 …

    ... defect 4116 is eating all 5V away. Must be getting hot ... fail too (they need the -5v supply or they tend to ... ).

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

    ... .

    The +2B needs +5V, +12V and, if memory serves me ... only critical voltage here is +5V. +12V is used to feed the ... at the other side, with +5V, +12V and GND. Watch out for ... ?. These can give you +5V and +12V in a Molex connector (the ...
    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
  • 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
  • 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 …

    ... 's. Each chip needs -5V, +5V and 12V and a common fault is ... pump circuit that creates the -5V and +12V supplies fails. There are ...
    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…

    ... components above where is says +5V - all the components below that ... already use one to supply 12v for my RGB->SVIDEO ...
    nuggetreggae nuggetreggae 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…

    ... to these chips (+5v, -5v and +12v). If the -5v supply has failed at ...
    Winston Winston 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…

    ... voltage regulator can't maintain +5V output. This can cause instabilities ... necessary. ;)

    The nominal 12V input is a "sweet spot ... internal regulator and feed with +5V [I]regulated[/I] DC directly ... , but will the 14.5v one be safe?[/quote]
    RetroTechie RetroTechie 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…

    ... /> This produces -5v and +12v for the ram, and +12v for the Colour ... a speccy off purely a 5v signal, you would have to ... 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…

    ... the spectrum use different voltages (5V and 12V). How can I use ...
    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…

    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
  • 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…

    [QUOTE=groove;426515]But the +12V of the PC PSU works @ ... /> Spectrum actually works with +12V @ 0.7A and +5V@ 2A, it's ...
    guesser guesser February 2010 Hardware
  • Spectrum 128+ (No TV picture)I got a Spectrum 128+ which is not generating any picture. I checked the TEA2000, and it gets not 12 Volt, but only 1.4, so this is the problem, I gu…

    ... -1.4V. +5V and 9V are all okay, -12V is in reality ... /> A repaired one +128K without +12V and I had to change ...
    Jose_Leandro Jose_Leandro March 2010 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    ... should be +12V, Pin 9 should be +5V. If -5V or -12V are absent ...
    RST#08 RST#08 March 2010 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    [QUOTE=gibs;431121]... 4/ how to check TR4/TR5 ?[/QUOTE]
    When -5V and +12V (at 4116) are present then both transistors work OK. So you checked already.
    roko roko March 2010 Hardware
  • Crappy video in +2B/+3Maybe it's not a failure in my ZX Spectrum, but I need some advice... I've got some spectrums (a ZX Spectrum +, two spanish ZX Spectrum +2B and a mo…

    ... /> - El colector, a 5V en lugar de a 12V
    - A?ade ... /> - Pull the colector to 5V instead of 12V
    - Add a capacitor ...
    mcleod_ideafix mcleod_ideafix March 2010 Hardware
  • Crappy video in +2B/+3Maybe it's not a failure in my ZX Spectrum, but I need some advice... I've got some spectrums (a ZX Spectrum +, two spanish ZX Spectrum +2B and a mo…

    ... - El colector, a 5V en lugar de a 12V
    - A?ade ... - Pull the colector to 5V instead of 12V
    - Add a ... mod is connected to +12v. Would help connecting to ... --------------------------

    Intentar? bajarlo a +5v, pero lo del condensador tendr ...
    Zup Zup March 2010 Hardware
  • Midi out on a ZX SpectrumYears ago (may be over 15 years...) I soldered a small adapter that lets a keyboard or synthesizer connect to the ZX Spectrum 128K's midi/RS232 port.…

    ... the circuits that requires 12v, check that the 12v line from the ... is not the 12V that is missing but the -12V... I am using ... power connector also has a -12V line...

    So, other ...
    bverstee bverstee March 2010 Hardware
  • Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…

    ... /> Possibly - you don't need -5V to get a stable image ... , and the supply voltage for +12V indicated above, is definately sufficient ... CPU isn't working). The +5V should be within 4.8 ... first.

    [B]With +5V in normal range[/B], and ...
    RetroTechie RetroTechie April 2010 Hardware
  • Trying to fix Spectrum Issue TwoHello everybody, I bought from eBay three Spectrums - one is Issue Two and the other two are Issue 3. The Issues 3s look like they are working but t…

    ... the coil is buzzing. The +12v is now good (can't ... but it is between +11.5v and 12.3v.

    Is the -5v good enough or it's ...
    Valentin Valentin April 2010 Hardware
  • component out?I would like to connect ZX48K to plasma TV with component cable. I read somewhere that signals are on the expansion edge connector. Do I need somethi…

    ... an external power supply for +5v only (replace 8 x 4116 ... Out without the need of +12v.
    Valentin Valentin April 2010 Hardware
  • component out?I would like to connect ZX48K to plasma TV with component cable. I read somewhere that signals are on the expansion edge connector. Do I need somethi…

    ... an external power supply for +5v only (replace 8 x 4116 ... Out without the need of +12v.[/QUOTE]Use the S-video ...
    -Micky -Micky April 2010 Hardware
  • component out?I would like to connect ZX48K to plasma TV with component cable. I read somewhere that signals are on the expansion edge connector. Do I need somethi…

    ... external PSU for +12v as well as for +5v.

    For ...
    Valentin Valentin April 2010 Hardware
  • Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky

    Speccy needs +12v for LM 1889 which is ... YPbPr converter.

    Then, +12v are used by the first ... />
    Eventually, you'll need +5v only to power up your ...
    Valentin Valentin April 2010 Hardware
  • Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky

    ... negate the need for the 12v supply circuitry can possibly cause ... problems. The 5v regulator (7805) is then required ...
    alien8r33d alien8r33d April 2010 Hardware
  • Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky

    ... 1 DRAM's that are +5V only, maybe they work as ... negate the need for the 12v supply circuitry can possibly cause ... problems. The 5v regulator (7805) is then required ... input is already around 11~12V if you're using the ...
    RetroTechie RetroTechie April 2010 Hardware
  • Electronics Help!I've brought a little universal amplifier from Maplins which is to go into the arcade machine I have, so power its speaker from the computers line ou…

    ... through the datasheet, you're missing the 'ground' component from input ... need a nice clean DC 12V at 800mA for this to ...
    bleugh bleugh May 2010 Chit chat
<1…16171819202122…34>

Latest Posts

  • I am currently watching.....
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    Renegade on April 21
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    John Elliott on April 21
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12v 1.9K 3.2K
5v 3K 4.9K

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