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  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... whole "analogue part". All the video generation, amplifier etc.

    12v ac connection. (which is used ... to generate the -12v and -5v supplies).
    I ...
    guesser guesser November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... overload (read shortcut) of the 12V switching convertor. This supposed problem ... hot (and there is no +12V at the 'hot' end of ... -type there in no vulnerable video RAM so repair is straight ...
    roko roko November 2011 Hardware
  • Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…

    The LM1889 (video chip) needs +12V, color problems may be related ...
    roko roko December 2011 Hardware
  • Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…

    ... me OK.
    - Remove 12V line to Video circuit. Still the same ... /> - Power up the Video circuit by external 12V power supply. Colours are ... back, so video circuit seems ...
    maskenlos maskenlos December 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... the memory corruption instead? The 12V and -5V (and +5V) lines ... display line (say in the video circuitry when the switch from ...
    Zorn Zorn December 2011 Hardware
  • Spectrum +3, Issue 2...I have just had plonked on my desk a nice issue 2 Spectrum +3. I'm not sure if its 100% working yet, as I have not plumbed it into a telly. So, assu…

    ... />
    As for disabling the noisy FM circuit I guess everyone ... the sound modulator to the video circuit. Once you've done ... notice any difference to the video quality etc after doing this ...
    guesser guesser December 2011 Hardware
  • What spectrum?I am going to have a gent send me some Spectrum hardware in the future. Me being a american and knowing nothing of the sort, what would be the best o…

    ... power supply which provides 5v, 12v and -12v. To use this would ... +2 provide the unmodulated composite video signal on their RGB out ...
    guesser guesser December 2011 Hardware
  • ZX Spectrum 128K composite video fixes in 1 documentI just finished my document with video fixes and improvements for all ZX Spectrum 128K models. Download it here: [URL="http://benophetinternet.nl/ho…

    ... ]But if you take the 12v line off the RGB socket ... could be used for composite video. For the second 12 V ...
    ingo ingo January 2012 Hardware
  • ZX Spectrum 128K composite video fixes in 1 documentI just finished my document with video fixes and improvements for all ZX Spectrum 128K models. Download it here: [URL="http://benophetinternet.nl/ho…

    ... could be used for composite video. For the second 12 V ... /> Ingo.[/QUOTE]

    The 12v line on the +3/2B ...
    guesser guesser January 2012 Hardware
  • ZX Spectrum 128K composite video fixes in 1 documentI just finished my document with video fixes and improvements for all ZX Spectrum 128K models. Download it here: [URL="http://benophetinternet.nl/ho…

    ... ?

    Include the composite video fix for the 48K too ... ]But if you take the 12v line off the RGB socket ... a Scart cable which needed 12V.
    Or are you referring ...
    bverstee bverstee January 2012 Hardware
  • 128K heatsink no color in composite video and bad antenna outputI am currently repairing a ZX Spectrum 128K heatsink model. It gives no colors on composite video output, and very bad antenna output. I opened it a…

    ... /> - the ULA
    - the composite video circuit after the TEA2000
    Allthough I have 12V, maybe there is some distortion ...
    bverstee bverstee February 2012 Hardware
  • 128K heatsink no color in composite video and bad antenna outputI am currently repairing a ZX Spectrum 128K heatsink model. It gives no colors on composite video output, and very bad antenna output. I opened it a…

    ... the scheme of +128K, composite video is taken from pin 7 ... to have composite video on +2A/+3, composite video is taken from ... /> And because I fixed the 12V, my thoughts are there is ... will check where the composite video signal comes from tonight, just ...
    bverstee bverstee February 2012 Hardware
  • 128K heatsink no color in composite video and bad antenna outputI am currently repairing a ZX Spectrum 128K heatsink model. It gives no colors on composite video output, and very bad antenna output. I opened it a…

    ... ULA
    - disconnecting the composite video circuit after the TEA2000 to ... modulator circuit to try composite video alone
    - replacing the ... 's of parts that use 12V to ignore any faults in ... power circuit
    - measuring the 12V and 5V lines with a ...
    bverstee bverstee February 2012 Hardware
  • Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …

    ... I do is the composite video mod: it's easy, virtually ... damage components doing that, improves video quality, makes it easier to ... board), you should have +5V, +12V and -5V there. If not ...
    RetroTechie RetroTechie February 2012 Hardware
  • Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …

    ... /> BTW: How is the composite video mod done?


    video mod: it's easy, virtually ... damage components doing that, improves video quality, makes it easier to ... board), you should have +5V, +12V and -5V there. If not ...
    dynaflux dynaflux February 2012 Hardware
  • Occasional noise over RGB on +2AHi all I have a +2A that is misbehaving at the moment. I'm using the RGB to SCART lead (which incedentally is great on my +3) The problem is, the …

    ... TR5) signals and a composite video output on pin 1 (see ... output with 12V on the pins that have composite video and vertical ... in the 'S' position, otherwise 12V is supplied to the connector ... around if a proper composite video output is to appear at ...
    Zorn Zorn February 2012 Hardware
  • 48K COMPOSITE VIDEO infosI'm not familiar with the Composite Video, so I'm asking help to WOS. I've got a 48k with Composite Video Mod. I am used to my Toastrack, that I plug…

    ... these trimmers.
    Unfortunately the video signal part of the spectrum ... purity of the 5V and 12V power supply. So for a ...
    ingo ingo February 2012 Hardware
  • 48K COMPOSITE VIDEO infosI'm not familiar with the Composite Video, so I'm asking help to WOS. I've got a 48k with Composite Video Mod. I am used to my Toastrack, that I plug…

    ... these trimmers.
    Unfortunately the video signal part of the spectrum ... purity of the 5V and 12V power supply. So for a ...
    Spectrum Spectrum February 2012 Hardware
  • Issue 4S users... I need your help!Short story: Issue 4S spectrum don't work. TR4 seems to have pins at different places from other speccys (BCE versus EBC), and usual replacement part…

    ... remove the load from the +12V and -5V lines before exchanging ... removed all 4116 (but 12v still has the video circuit attached). After ... that I searched for short circuits between +12v ...
    Zup Zup March 2012 Hardware
  • old PC with Monocrome Monitor Out.So as discussed in the Carboot sale thread, I have brought and old Apricot Xi. It takes a monochrome monitor via a 9 pin D connector. Now I don't ha…

    ... . The
    amplitude of the video signal is fixed at 0 ... .3V for normal intensity
    video, 0.4V for high intensity ... be drawn
    from the +12V suipply is 1.0A."
    guesser guesser March 2012 Chit chat
  • old PC with Monocrome Monitor Out.So as discussed in the Carboot sale thread, I have brought and old Apricot Xi. It takes a monochrome monitor via a 9 pin D connector. Now I don't ha…

    ... description I gather that the video signal is *not* ... difficult than if the video signal were also TTL ... sync + brightness signal (maybe video to [I]one[/I] ... br /> You could use that 12V for a 7805 regulator to ... low signal level for analog video.

    I ...
    RetroTechie RetroTechie March 2012 Chit chat
  • Spectrum 128K +2 video outAt the weekend I purchased a 128k+2 (the grey one). However, when I connect my TV to its composite out (via the video socket), the picture is quite n…

    ... (via the video socket), the picture is quite noisy in comparison to ... standard 128k. When I say noisy there is a wobbly pattern ...
    Graz Graz March 2012 Sinclair Miscellaneous
  • Spectrum 128K +2 video outAt the weekend I purchased a 128k+2 (the grey one). However, when I connect my TV to its composite out (via the video socket), the picture is quite n…

    ... (via the video socket), the picture is quite noisy in comparison to ... standard 128k. When I say noisy there is a wobbly pattern ...
    LCD LCD March 2012 Sinclair Miscellaneous
  • 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…

    ... parts, and disconnected the +12v to the video area by unsoldering R62 ...
    Asure Asure March 2012 Hardware
  • RFC: Hardware Documentation ProjectI've noticed quite a few threads recently about missing schematics and suchlike. I've also been thinking about the low quality of some of the schemat…

    ... [/url]

    Noise in 12V rail supply that affect the ... B/W composite video output for a colour video on a 128K ...
    mcleod_ideafix mcleod_ideafix March 2012 Sinclair Miscellaneous
  • Mr Do!, and paging ajmoss and othersIn threads like [url]http://www.worldofspectrum.org/forums/showthread.php?p=466099[/url] the possibility of Mr Do! has been discussed, but nothing…

    ... an emulated version...putting a noisy Flash video file on that page ...
    Sokurah Sokurah April 2012 Games
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... . However, if there is a video signal then the ULA is ... 5V(9), -5V(1) and 12V(8 ) are all present at ... />
    If the -5V or 12V are missing then there's ...
    Zorn Zorn May 2012 Hardware
  • 4116 replaced by 4164 - "Noisy" paper?After I replaced my 4116's with 4164's and hooked them up to +5V, disconnected -5V and +12V, I have what looks like vertical lines in the paper, like…

    ... measurement of +5V and +12V (used by video encoder) would be nice ...
    RetroTechie RetroTechie June 2012 Hardware
  • Need some advice about electronicsI have wired up an ATX power supply to power my spectrums through a DC-DC converter that gives 9V from the +12V rail. It works well. However, I also …

    ... the ground line of the video signal - causing noise.

    noisy current causes the same voltage ...
    ingo ingo June 2012 Hardware
  • ZX81 with black screen and some white dots.Was gearing up to do a composite video mod on my ZX81, and today was going to be it. Unfortunate when started my ZX81 seems faulty. I get a back scre…

    ... a quick an dirty composite video connection by wiring the ... went way. The image is noisy and a tad wavy, ... it stabilizes. The VCR video I was using as a ... RF to composite video converter doesn't cope.< ... I have seen the ZX81 video mods at sellmyretro before. But ...
    pmsr pmsr July 2012 Hardware
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