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Search Again :: Adv Search 1000 results in 0.032s
<1234567…34>
  • Kempston/Atari to Sinclair joystick adapterHi all, I've got a +3 and two competition pro gamepads (atari/kempston interface) so I want to build an adapter. As far as I can tell I just need to…

    ...
    6 - fire
    7 - +5v
    8 - ground
    9 ... /c

    There's no 5v on the sinclair - what does ...
    garethadams garethadams August 2011 Hardware
  • Repaired some 128K's todayI have lot's of ZX Spectrums laying aside with some more complex defects. Today I decided to try to fix some of them. I thought: why not share my ex…

    ... The CPU did nothing although 5V, 12V and the clock ... discovered a power problem: no 5V and no 12V, allthough the ... measured the resistance between 5V and 0V and it ... /> I started cutting the 5V cupper lines to the ram ... Problem is that the 5V that flows in the ...
    bverstee bverstee December 2011 Hardware
  • Issue 3 power problemHi all, I have an issue 3 board with an odd power problem, I have no -5V in fact, measuring the voltage on this line leads to a surprising result : …

    ... power problem, I have no -5V in fact, measuring the ... these out too, but still no -5V.

    So ... Issue 3 board, but still no -5V.

    I ... have snipped out the -5V decoupling caps for the RAM ... />
    Does the -5V go to anywhere other than ...
    prime prime July 2012 Hardware
  • 48k Issue 4A power supplyHi, I just repaired a 48k Spectrum+ with an Issue 4A board. The computer worked but the picture was mono with bad contrast and bad synchronizing. I …

    ... where only 1.7V and no -5V. At any time before someone ... therefore removed the 12V and 5V from the Rams. So only ...
    ingo ingo April 2013 Hardware
  • Dead +3The good news is I've just acquired a +3. The bad news is it doesn't bloody work. When I plug it all in and switch it on the disk drive starts spinn…

    Thanks guys

    I've opened her up, removed the disk drive and have found there is no +5V from the psu.
    Am going to have a bash at repaiing the psu and then hopefully my +3 will work.

    Fingers crossed
    BruceNorton BruceNorton February 2006 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…

    ... output and it should give +5V.
    Alternatively you may measure ... same.
    If there's no +5V, this can mean one of ... capacitors (blue ones) on the +5V line is shortened. It's ... testing voltage on it, if +5V appears on it, then 7805 ...
    Sonic Sonic May 2007 Hardware
  • Are there any brand new joystick compatible with +2?Hi, is there any place that sells brand new joysticks compatible with ZX +2? Or is there maybe some non ZX compatible joystick that can be easily m…

    Just buy a male and female 9 pin db and connect it will work and yes gnd is common you are right if you build the adapter you can still use with Amiga but no 5v so no autofire
    nuggetreggae nuggetreggae June 2010 Hardware
  • Kempston/Atari to Sinclair joystick adapterHi all, I've got a +3 and two competition pro gamepads (atari/kempston interface) so I want to build an adapter. As far as I can tell I just need to…

    ... has problems because there's no 5V supply. I've therefore decided ...
    garethadams garethadams August 2011 Hardware
  • 2 blown PSUs in one dayI got a SAM Coupe today, and the PSU started to smoke as soon as I turned it on. Since the Spectrum +3 PSU looked up to powering the SAM, I wired to…

    By my experience, it's the 2N2222 that often fails, and the sympthoms are as you described: no +5V supply and no blown fuse.
    mcleod_ideafix mcleod_ideafix October 2011 Hardware
  • Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…

    Looks like no -5V to me....
    Spirantho Spirantho October 2011 Hardware
  • Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…

    [QUOTE=Spirantho;573500]Looks like no -5V to me....[/QUOTE]

    ... go +4.98 for the +5V line, -12.13V for the ... and +3.47V on the +5V line.

    Similar readings ...
    absinthe_boy absinthe_boy October 2011 Hardware
  • Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…

    ... FPGA, and this also means no 5V tolerant, so you have to ... +drivers (resistors?) to make inputs 5V tolerant.
    mcleod_ideafix mcleod_ideafix October 2011 Development
  • +3 No power LED, disc motor continually spinning..and no display. I searched the posts and i found a really old thread going back to 2004 where fuses in the psu were discussed, checked em in this an…

    ... that connect below D5 are +5v, the two yellow connected ... blue and black must be -5v and -12v and are ... QUOTE]

    There is no -5v from the +3 PSU. It ... 'll be 5v on Red, 12v on yellow ... same. -12v blue, 12v yellow, 5v red.

    Before you ...
    guesser guesser December 2011 Hardware
  • Are Russian Clones a collector's piece?Hi Guys, I'm over at a mate's tonight drinking decent craft beer and we are (naturally) talking about Spectrums. I mentioned Spain, USA and Russia …

    ... port. But it's got no 5V so auto-fire doesn't ...
    chev chev April 2012 Chit chat
  • Issue 3 power problemHi all, I have an issue 3 board with an odd power problem, I have no -5V in fact, measuring the voltage on this line leads to a surprising result : …

    Well replaced TR4/TR5 again, and still no -5V :(

    Cheers.

    Phill.
    prime prime July 2012 Hardware
  • Issue 3 power problemHi all, I have an issue 3 board with an odd power problem, I have no -5V in fact, measuring the voltage on this line leads to a surprising result : …

    ... will help you.

    No -5V I guess is bad diode ...
    Johan1973 Johan1973 July 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 …

    ... okay, 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 ... each data line to the +5V line, the 0V line, all ...
    1024MAK 1024MAK March 2013 Hardware
  • autofire with amstrad +2 and 3's ?maybe this has been covered in the mists of time notice after building a few converters some joysticks worked and some didn't. zipstik (my fav... n…

    ... -fire circuits require a +5V supply and a (proper) ... Inputs/JoystickAtari2600_pinout.shtml[/URL]) +5V is on pin 7 ... / interfaces provide both +5V and 0V signals and have ... proper 0V ground, but no +5V line. May work with ... ports lack both a +5V supply and a proper ...
    1024MAK 1024MAK July 2013 Hardware
  • Joystick Interfaces on +2AJust found out that my DK'Tronics joystick interface doesn't want to play with my +2A (black). The Kempston port works OK, but not the Sinclair port…

    ... an actual Kempston IIRC) use +5V as a common.
    Once ... as the common. But has no +5V feed to the connectors.
    5V line and the fire button ... .
    The +5V on pin 7 is correct ...
    1024MAK 1024MAK April 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    followed the instruction video all looks okay but still no -5V or 12V.
    Could my replacemet transistor be the cause of this ?
    Gets real hot very fast.
    Brian Brian June 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    [QUOTE](it'd be worth checking the diodes)[/QUOTE]

    In particular D16 - I had a machine where this failed resulting in no -5v rail.

    B
    balford balford June 2014 Hardware
  • Help me fix my grail ZX 128k SpectrumHi all, Ok today my grail toaster rack ZX spectrum 128k turned up. I finally found one and for a reasonable price. I powered it up and..... Nothing …

    So no +5v measured from the points indicated ...
    balford balford July 2014 Hardware
  • ZX Spectrum 48K Issue 3, loss of -5V rail.Hi all, I've googled this problem and poured over the electrical diagrams for the circuitry concerning the power supplies and I believe I know what …

    ... it's still not got -5V, and the electrolytics and TR4 ... bad (because of there being no -5V). However, if you use a ... low. The RAM chips with no -5V should be roughly more-or ...
    Spirantho Spirantho August 2014 Hardware
  • Burned finger temp on rubber 48k heatsink normal?Ok so i opened it up because a few keys started to act up and i noticed that after burning my hand the heatsink was that hot i could actually smell t…

    ... /> Stopped the Speccy working with no -5v.

    I put a ...
    bagpuss22 bagpuss22 August 2014 Hardware
  • Giving up on SpectrumsHi all... Bit of a downer post here... I'm really close to giving up on Spectrums.. My 48k has given me nothing but head aches since day one... and …

    Is it possible something's up with the PSU?

    Composite modded Speccies generally put out some kind of video signal unless there's no 5v supply (check output of 7805 reg) or the ULA is removed or seriously toasted :D

    B
    balford balford September 2014 Sinclair Miscellaneous
  • '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…

    ... has been applied to the 5V line.

    Pull the ... at D16 (5v1 Zener) if no -5v line and 12v is present ...
    balford balford 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…

    ... has been applied to the 5V line.

    Pull the ... at D16 (5v1 Zener) if no -5v line and 12v is present ...
    blueowl0708 blueowl0708 September 2014 Hardware
  • Newbie with a faultHi all just joined after digging my spectrum out of the loft after 30 years, it was put up there because it had a common fault I remember from back i…

    ... out there.
    There is no hissiy or buzzy sounds coming ... a symptom of their being no -5V line, in which case you ... static and not moving, the -5V line probably [i]is[/i ...
    Spirantho Spirantho January 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…

    No -5v would indicate a D16 (5v1 Zener) failure (D19 if it's an issue 3B board), all other things being ok (TR4/TR5/recap).

    5v measuring 4.95v would indicate no shorts on the board.

    B
    balford balford July 2015 Hardware
  • where to find Harlequin rev. F all mods till now ?Hi all :) because no more broken speccys around for now, is time to build first of my Harlequin's rev F, I looking in forums and look at Ingo posts…

    ... j14 header i have 10v no 5v on other pin ... what is ... ?

    [img]http://forest.no-ip.org/wos/revf/20150803_202303 ... ]

    [img]http://forest.no-ip.org/wos/revf/20150803_202329 ...
    gorski gorski August 2015 Hardware
<1234567…34>

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