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<1…18192021222324…34>
  • 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…

    ... and consequent lack of +12v on a toastrack would ... (which is actually composite video on most RGB cables) ... come from the TEA2000. No 12V = No TEA2000 = No Sync ... thinking the signal is S-Video. :)

    The ... TV signal because the 12V isn't used for ...
    Spirantho Spirantho January 2015 Hardware
  • RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…

    ... to pin 5 of din (+12v) without any resistor but as ... 't know if supplying the 12v is the problem here or ... with pin 17 scart (composite video ground) so not sure if ...
    Ox. Ox. January 2015 Hardware
  • RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…

    ... to pin 5 of din (+12v) without any resistor but as ... 't know if supplying the 12v is the problem here or ... with pin 17 scart (composite video ground) so not sure if ...
    chinnyhill10 chinnyhill10 January 2015 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…

    ... likely is something shorting the 12v line to ground, or an ... :

    1) Checking the 12v line for shorts to ground ... /watch?v=IzgCmldm2H4"]this[/URL] video. Even though it focuses on ...
    balford balford January 2015 Hardware
  • RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…

    ... consider besides the actual video and sync when it ... so just connecting any 12v to it should basically ... work, for example the 12v pin on the RGB ... calculated by
    [CODE]
    12v * ((75 / (75 + R)
    ... .
    [CODE]
    I = 12v / (75 + R)
    [/CODE ...
    guesser guesser January 2015 Hardware
  • Introduce yourself[SIZE=3][FONT=Comic Sans MS]This is the thread to stop by & introduce yourself.[/FONT][/SIZE]

    ... by adding an old VHS video recorder, which WOULD tune to ... Card.
    -Display Signal painfully noisy, so attempted to re-callibrate ... output!
    -Success....Easy COMPOSITE video output mod completely repairs and ...
    GameBaddie GameBaddie January 2015 Chit chat
  • Guess the video faultI've two dead flesh Spectrums, one a 16K issue 2 outputting white with a tinge of blue (not as extreme as photo shows) with two pink horizontal lines…

    ... to be in the analogue video circuitry.

    Are the ... (the +9V, the +5V, the +12V and the -5V) all okay ... the area of the analogue video circuitry have not been changed ...
    1024MAK 1024MAK January 2015 Hardware
  • No display on a 128 toastrackHi All, I just bought a 128k off ebay with the usual, "it worked last time I used it", so I read into this "it does not work". True enough, it does n…

    ... used to generate the +12V, -5V and -12V supply rails. This level ... be limited to the analogue video circuitry. The Z80 CPU, at ...
    1024MAK 1024MAK February 2015 Hardware
  • Scart issues with a 2AAnyone else have problems with scart leads with Spectrum 2A's?. I tested mine with three Samsung TV's ( all around 2/3 year old) , and it gave me a …

    ... that sync signal is very noisy which could be part of ... /limited-batch-of-new-s-video-adapters/msg94123/#new"]http://www ... /limited-batch-of-new-s-video-adapters/msg94123/#new[/URL]
    chinnyhill10 chinnyhill10 February 2015 Hardware
  • No display on a 128 toastrackHi All, I just bought a 128k off ebay with the usual, "it worked last time I used it", so I read into this "it does not work". True enough, it does n…

    ... rails ( +12V, -5V and -12V).
    The composite video section needs a +12V supply ... -SCART leads use the composite video signal for the synchronization signals ... your pictures, all the visible video picture is there, but the ...
    1024MAK 1024MAK February 2015 Hardware
  • Initial check - 128k ToastrackI was wondering if there are any guides to initial checks that can be performed on a 128k speccy (toastrack) before first power on? I've the excelle…

    ... circuit is present to generate +12v from the +5v input.
    12v is used only for the TEA2000 video chip, and ... get very faint or no video.

    So go ahead ...
    balford balford February 2015 Hardware
  • ZX Spectrum (pre-128K) Edge ConnectorCan anyone point me in the direction to a decent diagram of the ZX Spectrum (pre-128K) Edge Connector. I can't believe I've been searching for nearl…

    ... IOREQ RD WR -5V WAIT +12V 12VAC M1 RFSH A8 A10 ... A1 A2 A3 IRQULA 0V VIDEO NC NC NC BUSREQ RESET ...
    Tiger Tiger March 2015 Hardware
  • 48k issuesThe 48k speccy had several alterations ( issues) and I was wondering, they all seam to work ok so what was the point?<br>

    ... adjustment capacitors near the comp. video encoder IC, removed on later ... found a way to make video signal generation less 'critical' / dependent ... there's the changes to +12V / -5V generating circuit. Changed with ...
    RetroTechie RetroTechie June 2015 Hardware
  • Grey +2 - DOA and no power lightTook a punt on a grey +2 at the weekend to be a spare. It was "untested" although so were all my other +2's which are all fine. Tried to power th…

    ... (IC27) and possibly the +12v output is dead (caused by ... be causing the lack of video.

    If ... TEA2000 IC (should be 12v if all is well). ... then check if you get video output.

    ... Once you get video back, you'll usually be ...
    balford balford August 2015 Hardware
  • Display bandsHi all, I'm busy working on an issue 3 16k Spectrum I picked up on eBay. I've upped it to 48k and put a new membrane in. I noticed the display was…

    ... the design and of the video signal standard. But yours is ... multimeter. Can you test the +12V supply that feeds the LM1889 ...
    1024MAK 1024MAK September 2015 Hardware
  • PSU replacement for +2a/+3Hi, With the suitable connector does a PC power supply can be used to power a ZX+2a/+3 ? Thanks

    ... very, and I mean VERY, noisy.
    The cable can be ... each and 1 each for +12V and -12V.
    [img]http://s6 ...
    Dan Antohi Dan Antohi September 2015 Hardware
  • I recapped my 128K toastrack, installed stereo kit and detached audio from video, but...Hello fellow forumers! I'm seeking for help: I've finally decided to change all electrolytic capacitors of my 6U (with all Panasonics 105oC)... Af…

    ... , or the +12V supply to the video circuitry (inc. the +12V feed to ...
    1024MAK 1024MAK October 2015 Hardware
  • I recapped my 128K toastrack, installed stereo kit and detached audio from video, but...Hello fellow forumers! I'm seeking for help: I've finally decided to change all electrolytic capacitors of my 6U (with all Panasonics 105oC)... Af…

    ... checked for 9v, 5v and 12v around the power area, OK ... ... I also checked for 12v in pin 11 of TEA2000 ... should I check for 12v (to the video circuity)? In what pin ... RGB socket should I get 12v? (Oh my, I forgot to ...
    geosiou geosiou October 2015 Hardware
  • Display bandsHi all, I'm busy working on an issue 3 16k Spectrum I picked up on eBay. I've upped it to 48k and put a new membrane in. I noticed the display was…

    ... far too small for a video signal of this type. ... bandwidth (frequency range) of the video signal (act like filter). The ... amount of smoothing on the +12V supply, causing the high frequency ... mix with the colour signal video frequencies causing strange effects.
    1024MAK 1024MAK October 2015 Hardware
  • Alley Cat conversion to Spectrum WIPThis game is being converted in the russian fórums, and it actually looks very promising. Here is the link: http://zx-pk.ru/showthread.php?t=25304…

    ... me some link to a video of the original, so I ... for beep fx. Lots of noisy blips and white noise.
    FrankT FrankT November 2015 Development
  • Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…

    ... mention that the -5 and +12V line is working, but no ... that Zorn mentions in this video: http://youtu.be/IzgCmldm2H4
    memrah memrah December 2015 Hardware
  • Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…

    ... that causes interference on the video picture, is the logic, memory ... from. They are electrically very noisy, and some of this noise ... find a way into the video circuitry.

    [b][i ... that could be electrically less noisy than Zilog's original?
    Renegade Renegade December 2015 Hardware
  • Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…

    Best thing I found for reducing video interference was replacing C5 to C8 (the 12v decoupling caps for the lower RAM) with 1nf ceramics. On mobile at the moment, but if you search my post history you'll find it :)

    B
    balford balford December 2015 Hardware
  • Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…

    ... for reducing video interference was replacing C5 to C8 (the 12v decoupling ...
    1024MAK 1024MAK December 2015 Hardware
  • Jiiira's Sparrow LITEHi All, Just for info .. :) big eprom, cheap 32KB ram and etc. i don't know specification .. :) https://youtu.be/NbI7E1aebrM modern speccy .. …

    ... not fit right .. :)
    video signal is bad like original ... improvements:


    - video output is now the Composite ... modulated

    - the video RAM is in single SRAM ... - the +12V power is now needed only for the LM1889 video chip ...
    gorski gorski December 2015 Hardware
  • Spectrum +2 with CM8833 MK-II monitor (RGB)Hello all, This weekend I decided to resurrect my old 128K Spectrum +2 (grey model). I plugged it into an LCD TV via RF, but the picture is rathe…

    ... as expected, it's pretty noisy. In the 0V condition it ... HSYNC noise.

    The video output on this looks very ...
    BJH BJH January 2016 Hardware
  • Testing 4116 type DRAMsHappy New year All! I'm managed to find some time to repair some more Spectrums :) woo hoo. I have a couple with busted lower RAM, Sooo, I appr…

    If there is no 12V, the video system won't produce a TV picture on RF UHF or composite video output.
    If the +5V is missing, nothing will work.
    Please list the actual voltages.

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK January 2016 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 …

    Netziel +5 +12v mit Molexstecker fut Festplatten (Model ... were an American " You Tube" video Iwould have a "Box Opening ...
    harriusherbartio harriusherbartio February 2016 Hardware
  • 128 +2 grey, no video but still beepsGot a grey 128 from ebay, im using a 48k spectrum powers supply, all voltages seem ok. I cant get compostie video using the normal mod or from the 8…

    ... 5)
    LK2 ... open (no 12V via R9 at pin 1 ... )
    LK3 ... closed (12V via R15 at pin 5 ... present)
    LK4 ... closed (composite video at pin 1)
    LK7 ...
    ingo ingo February 2016 Hardware
  • 128 +2 grey, no video but still beepsGot a grey 128 from ebay, im using a 48k spectrum powers supply, all voltages seem ok. I cant get compostie video using the normal mod or from the 8…

    ... is the switching voltage for video. The input resistance is in ... higher than 9V (up to 12V) to be sure that the ...
    ingo ingo February 2016 Hardware
<1…18192021222324…34>

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