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Search Again :: Adv Search 1000 results in 0.027s
<1234567…34>
  • Spectrum Missing -5vMy Spectrum is "almost" booting, just when you expect the (C) 1982 Sinclair Research to appear it just displays flashing squares on the screen :( I …

    My Spectrum is "almost" booting, just when ... seems to be missing it's -5V, the +12V, +5V are ok
    Spectrum issue 3

    Any ...
    OttO OttO November 2013 Hardware
  • Spectrum+ fault - lines on boot screen, freezesThe ZX Spectrum+ I bought in the car boot has a fault. When you boot it, it's displaying the Copyright screen, but each character position has a vert…

    The ZX Spectrum+ I bought in the car ... a broken Issue 2 Spectrum (the problem was missing -5V, so I don ... works... so that means the Spectrum+'s keyboard is faulty :/ - or ...
    Muzer Muzer June 2011 Hardware
  • Powering a Spectrum with 5v?I live in the States, but I'm originally from England. My original Spectrum is still at my mum's house in the UK, and I was thinking of asking her t…

    ... br />
    My original Spectrum is still at my mum ... is actually regulated down to 5v (and a lot of ... and inject a regulated 5v into where the voltage output ... was?

    Regulated 5v PSU's are everywhere, because ... PAL input, so a 5v mod and a composite mod ...
    Jamesbeat Jamesbeat August 2014 Hardware
  • Spectrum +I have a boxed as new Spectrum + missing a tv lead/modulator I wish to sell, I can provide pictures for anyone interested. Nigel

    I have a boxed as new Spectrum + missing a tv lead/modulator I wish to sell, I can provide pictures for anyone interested.

    Nigel
    nigelsutcliffe nigelsutcliffe January 2007 Sales
  • Newbie question about my unwell Spectrum...Hi - I have had a couple of dud 48K Issue 3 Spectrums in the loft for 20 years or more. One would initialise sometimes but could not be guaranteed t…

    ... traced the fault to a missing -5V rail, which has been fixed ... on pin 1 is -4.5V, pin 8 is +12.4V ...
    weathereye weathereye February 2011 Hardware
  • Some 48k+ packages for saleSoon! Rwap is sending over a few membranes for 48k+ machines, so far, got two fully functional (and looking good!), soon as the membranes are in the…

    ... still working on finding the missing -5V supply but I have rigged ... -5V from a battery via a current limit resistor and the Spectrum ...
    weathereye weathereye February 2011 Sales
  • Spectrum+ fault - lines on boot screen, freezesThe ZX Spectrum+ I bought in the car boot has a fault. When you boot it, it's displaying the Copyright screen, but each character position has a vert…

    ... a broken Issue 2 Spectrum (the problem was missing -5V, so I don ... ]

    I presume the missing -5v is now present...

    5v has been absent with the ...
    Winston Winston June 2011 Hardware
  • Revive Spectrum +3 power supply(ies)Hi all, it's me again... [url]http://www.worldofspectrum.org/forums/showthread.php?t=33677[/url] In continuation from last time, I have two original…

    ... assume you are just missing 5v, and have +12v and ... ="http://ckhatton.com/misc/spectrum/20130130_152250.jpg"][IMG]http://ckhatton ... .com/misc/spectrum/20130130_152250_small.jpg[/IMG][/ ... http://ckhatton.com/misc/spectrum/20130130_152440.jpg"][IMG] ...
    Crimbo Crimbo January 2013 Hardware
  • Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…

    ... the testing of a Spectrum. All the Spectrum repair experts normally ... PSU, the 5V, -5V and 12 V supplies. A missing -5V for example can ... normally like to get the Spectrum to bare essentials first. ... board. If the healthy Spectrum does not start correctly with ...
    Pierre Pierre May 2013 Hardware
  • Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…

    ... make the coil resonate - a Spectrum should have a healthy buzz ... bad (unlikely as it's missing -5V and +12V) you need to ...
    Spirantho Spirantho September 2014 Hardware
  • Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…

    ... make the coil resonate - a Spectrum should have a healthy buzz ... bad (unlikely as it's missing -5V and +12V) you need to ...
    lesoleil70 lesoleil70 September 2014 Hardware
  • Frying a 48K ZX Spectrum (revision 4A) with 10 V instead of 5 VHello I got a used zx spectrum. When I opened it up, there was no 5 V positive voltage regulator at the 10 V power inlet. Instead what would be in…

    ... are only rated for a 5V supply.... so any could ... can be damaged by a missing -5V supply.

    ...
    So fit a 5V regulator. Next check that you ... chips need +12V and -5V supplies. The video circuitry ... the PSU and the Spectrum during testing. Then if ...
    1024MAK 1024MAK April 2017 Hardware
  • Faulty Issue 1Hi all, thought I'd document my efforts in getting another speccy working. I've never done this before so please bear with me... I recently took a p…

    ... this one off of ebay ("missing power supply - unable to test ... far and surprise surprise my -5V is missing. I replace TR4 and ... second. I measure for the missing -5V and get only -3.3V ... back on and measure -4.5V with a slightly quieter coil ...
    namtip namtip November 2015 Hardware
  • Sinclair 16k Ram pAck Issue3 schematicsHi guys, I am willing to repair a 16k ram pack for the ZX81 but I cannot find any schematic of the ISSUE 3 ram pack. I could only find a schematic…

    ... smoke and therefore I am missing -5V and +12V. I would like ... 8118 ram which requires only +5V. Problem raised when desoldering one ...
    repetto74 repetto74 March 2019 Hardware
  • Papaya Labs shop open for DivIDE pre-orders.Papaya Labs are now taking pre-orders for DivIDE interfaces and other DivIDE accessories. Find their shop at [url]http://www.papayalabs.co.uk/shop/[…

    ... +5v, so it would be easy to power it from the Spectrum ... 's +5v supply? Just wire from ...
    trellis trellis August 2006 Hardware
  • Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …

    ... to do. The Spectrum generates +5V, +12V and -5V from the 9V supply ...
    mcleod_ideafix mcleod_ideafix July 2009 Hardware
  • Issue 2 Speccy faultHi Guys, I'm really hoping someone can help me with a fault that has just developed on my issue 2 speccy. After perservering for some time with usi…

    ... /> 2. If any voltage is missing, stop using it till you ... kill 4116 RAM).

    Missing -5v/+12v to the 4116 usually ...
    Winston Winston December 2010 Hardware
  • Spectrum+ fault - lines on boot screen, freezesThe ZX Spectrum+ I bought in the car boot has a fault. When you boot it, it's displaying the Copyright screen, but each character position has a vert…

    ... =Winston;545722]I presume the missing -5v is now present...

    5v has been absent with the ... /> I mean the lack of -5V was on the Speccy from ...
    Muzer Muzer June 2011 Hardware
  • Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…

    ... you could run a Spectrum off +5V but you'd need to ...
    Spirantho Spirantho October 2011 Hardware
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    ... ]Measure the resistance between the -5v line and ground.

    5v legs of lower ram chips ... getting 90k ohms at the -5v pin, 1 but would rather ... help it.
    Would the missing -5v be taken away by a ...
    Marshall Marshall January 2012 Hardware
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    Just an update on this, Ive managed to restore the missing -5v :)

    But am now given the screem in the first picture (0311):mad:

    [url]http://www.flickr.com/photos/73527395@N05/?saved=1[/url]
    Marshall Marshall January 2012 Hardware
  • 128k Toastrack repair advice needed..Hey all, Just got my second toast rack in a oddball deal when i visited a local farmer for some other second hand stuff. The 128 was sitting in a p…

    ... suspect. Wrong voltages came from missing 5V, at some stage the wire ...
    Asure Asure March 2012 Hardware
  • Revive Spectrum +3 power supply(ies)Hi all, it's me again... [url]http://www.worldofspectrum.org/forums/showthread.php?t=33677[/url] In continuation from last time, I have two original…

    ... I assume you are just missing 5v, and have +12v and -12v ...
    guesser guesser January 2013 Hardware
  • New hardware for Spectrum from ShaosI have some ideas for new ZX-peripherals and quickly designed a prototyping board for experiments: [URL=http://nedocon.com/store/speccy/][IMG]http:/…

    ... for chips intolerant of the Spectrum's 5v signalling). It also contains ... .

    [img]http://spectrum.alioth.net/doc/images/c ... img]

    [img]http://spectrum.alioth.net/doc/images/f ... here:

    [url]http://spectrum.alioth.net/doc/index.php ...
    Winston Winston July 2013 Hardware
  • Spectrum Plus display issueHi, does anyone know if this is fixable at all by someone with no experience? From looking on a similar post on World of Spectrum forum they mention…

    ... check will no doubt find missing -5v and +12v at pin 1 ...
    balford balford May 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…

    ... longer the chance of a missing -5V supply causing further damage, as ... voltage readings.

    The +5V is produced by the 7805 ... coil is faulty, the -5V supply will be missing (around 0V) or ... supplies to work correctly, the +5V supply must be working.
    1024MAK 1024MAK September 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…

    ... I've seen just a missing -5v rail on a Speccy, it ...
    balford balford September 2014 Hardware
  • Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …

    ... you have fitted to your Spectrum. The -5V line will end up ... electrolytic capacitors:-
    For the +5V use C34 (22uF)
    For ...
    1024MAK 1024MAK November 2014 Hardware
  • The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…

    ... not possible to get a Spectrum more dead unless you ... />
    As well as missing all of the IC's ... snipped, and it was missing both BA157 diodes, the ... , electrolytic caps and the missing diodes. Once this was ... I'd expect from a Spectrum missing all it's RAM ...
    balford balford February 2015 Hardware
  • another non working issue 3 48kHi all, next! :) I don't have good filings about this speccy :) https://youtu.be/D9qpCR18-kI here is short video what this speccy do. we hav…

    ... causes of a low or missing -5V are:-
    Issue 3: C46 ...
    1024MAK 1024MAK July 2015 Hardware
<1234567…34>

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