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<1…13141516171819…34>
  • ZX Spectrum 48k Issue 2 Faulty Ram?Hi, I have a faulty ZX Spectrum Issue 2 motherboard. Looks in very tidy condition. Though I'm getting random columns of blocks and flashing cursors…

    Standard electrolytic caps are OK. It is ... phenomenon for the electrolyte in capacitors to dry up over years ...
    Pierre Pierre June 2013 Hardware
  • Composite mod display problemI'm fairly ham-fisted with a soldering iron but I thought I'd have a crack at the composite mod on two of my 48K rubber keys, as I'd already opened o…

    ... high value resistors, rather than capacitors.

    I don't ... .

    Change the 22uF electrolytic that's C25 (I think)
    DEATH DEATH July 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... . In my experience in optoelectronics, capacitors are usually overspecced and so ... ] you could buy a 1uF electrolytic capacitor rated at 10V, that ...
    1024MAK 1024MAK July 2013 Hardware
  • Issue 4A repair attemptI think I need some help. I have a nice Issue 4A main board here, which does not give out any video signal. I checked some voltages (the ones that se…

    ... flow (called "Leakage"). As capacitors age, the insulation layer can ... an AC signal. Many capacitors really do not suffer too ... electrolytic on sight and not even bother testing it. Now ALL capacitors ... add here, that an electrolytic capacitor doesn't exhibit it ...
    DEATH DEATH July 2013 Hardware
  • Plus D Voltage Regulator OrientationHi, I?ve got a Plus D Disc Interface circuit board without case from a friend. Sadly he sends it to me without care for proper packaging. So it arr…

    ... lots easy to cut the capacitors legs and turn it around ... pads between this 100uF 25V electrolytic capacitor and the 7805 voltage ... have no new 100uF 25V electrolytic capacitor here,
    I can ...
    Luzie Luzie July 2013 Hardware
  • Parts listAre there any list of parts - caps, resitors, transistors etc. - for Spectrum motherboard revisions. Im thinking I may need to replace te electrolyt…

    ... Radial Electrolytic Capacitor 105?C[/FONT]

    Other useful capacitors ... Liberation Serif]4700uf 25v Radial Electrolytic Capacitor 105?C[/FONT] ... Liberation Serif]10uf 25v Radial Electrolytic Capacitor 105?C[/FONT] ...
    1024MAK 1024MAK September 2013 Hardware
  • Parts listAre there any list of parts - caps, resitors, transistors etc. - for Spectrum motherboard revisions. Im thinking I may need to replace te electrolyt…

    ... Radial Electrolytic Capacitor 105?C[/FONT]

    Other useful capacitors ... Liberation Serif]4700uf 25v Radial Electrolytic Capacitor 105?C[/FONT] ... Liberation Serif]10uf 25v Radial Electrolytic Capacitor 105?C[/FONT] ...
    rune rune September 2013 Hardware
  • Opus Discovery OddnessHi everybody, I'm busy trying to repair an Opus Discovery for a customer. It's proving to be quite frustrating. First off, the LM317T regulator fo…

    ... />
    Edit: Oh yes, all capacitors have been changed, as has ... winding, a rectifier and a electrolytic cap. On the same rail ...
    Falco-F8L Falco-F8L October 2013 Hardware
  • Faulty grey +2, or not?While I?m still fighting with two to three grey +2 computers, which doesn?t give a video signal, I received another grey +2, which acts very strangel…

    ... capacitance value. The way an electrolytic cap works is to have ... become leaky. Larger value capacitors also tend to be more ... Because the dielectric of these capacitors is not dependant upon the ... replacement chips.

    Capacitors and their uses is a ...
    DEATH DEATH November 2013 Hardware
  • PSU Overvoltage?Going through a pile of 48k PSU's today, rewiring and fitting new plugs, testing each one as I go I came across one that outputs 14.85v, usually im g…

    ... use, I would desolder the electrolytic capacitor, test the diodes, ... and fit a new 105C electrolytic capacitor. Then perform a load ... . Sometimes you find different rated capacitors have been used.
    ... if a diode or a electrolytic capacitor is dying (or has ...
    1024MAK 1024MAK March 2014 Hardware
  • ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…

    ... ?C 100UF 25V Axial Electrolytic Capacitor
    Radial ... Radial Electrolytic Capacitor 105?C

    Other useful capacitors ...
    11-0170 Forever 85?C 47UF 10V Axial Electrolytic ... 11-3748 4700uf 25v Radial Electrolytic Capacitor 105?C
    ...
    Beaps Beaps July 2014 Hardware
  • I broke my 48k Speccy!!!!Hey guys, I am looking for some advice, I hope you can point me in the right direction. So, I went about replacing all the capacitors on my issue 4…

    ... , when I understand that uf capacitors are used? [/QUOTE]
    1000 ... Farad)
    Capacitors in the nF range are not electrolytic types.
    roko roko December 2014 Hardware
  • Cooking toastrack... the dreaded smellI powered up my Spectrum 128 (heatsink model) yesterday only to see what looked like an out-of-tune picture on the television. I'm using a scart adap…

    ... .



    What capacitors relate to this circuit and ... />
    The capacitors should be all of the electrolytic ones in that ...
    balford balford January 2015 Hardware
  • Spectrum CapacitorsLooking for some opinions here, if I may? In the 80's and 90's I used to repair Spectrums and other machines for a living so I'm reasonably famili…

    ... never just go and replace capacitors unless I suspected them as ... said, if I suspect one electrolytic of being on its way ...
    RobeeeJay RobeeeJay September 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 …

    Ceramic capacitors have improved, so it is ... possible to replace a 1uF electrolytic with a 1uF ceramic type ... do sometimes fail, but unlike electrolytic, they don't degrade in ... .

    None of these capacitors cost very much, so I ...
    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 …

    ... "]here[/url].
    4) Cheap capacitors

    Also:-
    ... rails would use three capacitors (two electrolytic and one ceramic) and ... rails, a total of six capacitors and two inductors. These ... ] plus two X2 suppression capacitors (one on the input ...
    1024MAK 1024MAK February 2016 Hardware
  • I've Killed my BBC Micro :(So, today I pluged in my BBC Micro via my step up converter. It did the customary double beep. I was buzy tuning in the LCD tv to it, as I'd lost the…

    ... are mains rated "X2" suppression capacitors and both should be renewed ... one 220uF 10V or 16V electrolytic 105C rated for C9, the ... 275Vac
    A good quality Electrolytic Capacitor Al, 105 deg C ... /content/BBC-Micro-PSU-X2-capacitors/

    [b][i]Mark ...
    1024MAK 1024MAK January 2017 Chit chat
  • Spectrum 48k Power Supply?Guys - I've got a Spectrum 48k inbound from the UK. I want to scrounge a power supply to use when it arrives. What size jack did it use and what ar…

    ... .

    BTW originally installed capacitors are 85degC temperature rated, but ... is the failure mode for electrolytic caps so better sealing means ...
    msansom msansom February 2017 Hardware
  • Harlequin Rev G - Decoupling Capacitors?Guys - I started assembling my Rev G Harlequin board over the weekend. Right after I picked it up and started loading parts, it struck me that there…

    ... to add a few decoupling capacitors here & there. Especially near ... , consider tantalum or Alu-polymer electrolytic (solid electrolyte). Relatively expensive, but ...
    RetroTechie RetroTechie March 2017 Hardware
  • ZX Spectrum spare parts : "endangered" and functional "extinctions" only It struck me how some Spectrum spare parts or parts that were used with Spectrums and that were commonly available are no longer available . The em…

    ... /> It is strongly argued that capacitors can fail in old Spectrums ... . I have not replaced any capacitors yet . But if these experts ... capacitors are not rare. But which type is best , the original electrolytic ...
    harriusherbartio harriusherbartio March 2017 Hardware
  • Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …

    ... for me is doing the capacitors so I think for that ... in and should I get electrolytic or the other type? The ... electrolytic ones have a limited lifespan ...
    harriusherbartio harriusherbartio April 2017 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 …

    ... replace all the ceramic capacitors just the big electrolytic ones

    harriusherbartio harriusherbartio July 2017 Hardware
  • Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…

    Try also renewing any electrolytic decoupling capacitors feeding the +5V that supplies or is near to the DRAM chips.

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK January 2018 Hardware
  • Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…

    ... the changes you did to capacitors are also applicable to grey ... they are. C52 is the electrolytic capacitor on the ULA’s ... –C19 are the eight decoupling capacitors for the RAM ICs (one ... easy to see. Adding more capacitors doesn’t do anything at ...
    Ast_A_Moore Ast_A_Moore January 2018 Hardware
  • Re-created Multiface 128Just bought the bare board from the Bay and am wondering if anybody else on here has built one? Well made PCB, doc files online including a BOM an…

    ... quote]
    Err, polarised capacitors have to fitted / connected ... are examples of polarised types. Electrolytic have minus signs (-) marked ... TTL logic, if polarised capacitors are used, normally the ... 5V, or -12V) or capacitors are used in voltage boosting ...
    1024MAK 1024MAK June 2018 Hardware
  • Re-created Multiface 128Just bought the bare board from the Bay and am wondering if anybody else on here has built one? Well made PCB, doc files online including a BOM an…

    ... , you should remove any tantalum capacitors that have been fitted the ... wrong way round. Tantalum capacitors are different to electrolytic types, but still ...
    1024MAK 1024MAK June 2018 Hardware
  • Fixing a poorly Issue 3 - Odd faults.Here's one for you Spectrum fixers, I warn you it's a long one. I've spent a couple hours this evening doing several repairs on a rubber keyed Speccy…

    If any of the ceramic capacitors are physically damaged, renew them. ... , and life expired electrolytic 4700uF capacitor (or two 2200uF capacitors).

    1024MAK 1024MAK July 2018 Hardware
  • Finding a good (UK) external switch mode power supply for the basic 48k and 128k ZX SpectrumsThis idea has probably "done the rounds" by now . I think I have heard about it a bit late . This thread with look at replacing the original "heavy l…

    ... , I do recommend that the electrolytic smoothing capacitor(s) be renewed ... old age. But if the electrolytic smoothing capacitor(s) dries out ... for TR4, TR5, some new capacitors and a new voltage regulator ...
    1024MAK 1024MAK September 2019 Hardware
  • Spectrum 128k+ for saleHi, I have an excellent condition Spectrum 128k+ (heatsink type) that has been totally reconditioned. -New capacitors, AY sound chip, Z80 cpu, membra…

    ... been totally reconditioned.
    -New capacitors, AY sound chip, Z80 cpu ...
    thomas3120 thomas3120 May 2004 Sales
  • Issue two picture qualityDoes anyone know if issue two and earlier spectrums have worse picture quality (in general, beside colours) compared to issue 3 and later? I mean on…

    ... tr1 and tr2 ransistors and electrolytic caps with new ones, i ...
    gtsamour gtsamour January 2007 Hardware
<1…13141516171819…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
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    Renegade on April 21
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    John Elliott on April 21
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    rich_chandler on April 21
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    mel the bell on April 21
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    harriusherbartio on April 21
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    harriusherbartio on April 21
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