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Search Again :: Adv Search 886 results in 0.001s
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  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... value. I have also replaced TR4, TR5 and removed all the ...
    deadeye deadeye April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... /> You could also double check TR4 and TR5 in circuit with ...
    Zorn Zorn April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... be an issue with TR5. TR4 still looks good. I tested ...
    deadeye deadeye April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... be an issue with TR5. TR4 still looks good. I tested ...
    Zorn Zorn April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    You must try to filter out 'shortcircuited' chips that ruin TR4, by monitoring the +12V. Note that chips that cause no short can still be defect, but the ones causing overload must be eliminated first.
    Use your current limiter.
    roko roko April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... out 'shortcircuited' chips that ruin TR4, by monitoring the +12V. Note ...
    deadeye deadeye April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... of the 4116's. Replaced TR4 and TR5. And when testing ...
    deadeye deadeye May 2013 Hardware
  • Issue 4S AnnoyanceRecently ive been going through a few interfaces testing them and I stupidly inserted a "key-less" interface (didnt know at the time but should have …

    ...and I'd suggest replacing TR4 and TR5 and re-checking the voltages
    JeffB JeffB May 2013 Hardware
  • Issue 4S AnnoyanceRecently ive been going through a few interfaces testing them and I stupidly inserted a "key-less" interface (didnt know at the time but should have …

    Thanks everyone, its already composite modded and ive tried the ULA in a working machine, it works so its something else, ill take a closer look at TR4 and 5, sure ive got some spares of those somewhere
    Macc Macc May 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…

    ... well as assorted replacements for TR4 etc... I can see this ...
    Simon_Carr Simon_Carr May 2013 Hardware
  • Strange and faulty toastrackI just got hold of a toastrack, which is kind of strange. First of all, when I opened it, I spotted a socketed ULA and ROM, which is good, however, t…

    ... diode test? If so, remove TR4 and check it, it's ...
    Falco-F8L Falco-F8L May 2013 Hardware
  • ZX Spectrum Microvision - REAL retro setup!Some fun pictures. In reality the picture looks some better and more readible, but the camera doesn't pick it up well. [IMG]http://benophetinternet.…

    ... even socketed the toroid and TR4 and 5.
    I also ...
    bverstee bverstee May 2013 Hardware
  • ZX Spectrum Microvision - REAL retro setup!Some fun pictures. In reality the picture looks some better and more readible, but the camera doesn't pick it up well. [IMG]http://benophetinternet.…

    ... even socketed the toroid and TR4 and 5.
    I also ...
    RobeeeJay RobeeeJay May 2013 Hardware
  • another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…

    ... psu

    2) turned TR4 by 180 degree and relink ...
    emilen72 emilen72 May 2013 Hardware
  • ZX Spectrum Microvision - REAL retro setup!Some fun pictures. In reality the picture looks some better and more readible, but the camera doesn't pick it up well. [IMG]http://benophetinternet.…

    ... test board.
    Closeup shows TR4 and 5 and the toroid ...
    bverstee bverstee May 2013 Hardware
  • ZX Spectrum manufactured by SAMSUNGI just got hold of a 48K ZX Spectrum Issue 4S of which was manufactured by SAMSUNG. I was not aware that Samsung manufactured Spectrums under licence…

    ... position's to fit the TR4 transistor. One of the position ...
    Your Spec-chum Your Spec-chum May 2013 Sinclair Miscellaneous
  • Strange and faulty toastrackI just got hold of a toastrack, which is kind of strange. First of all, when I opened it, I spotted a socketed ULA and ROM, which is good, however, t…

    ... " ZTX213 and ZTX651, de-soldered TR4 and TR5 and replaced both ...
    schombi schombi May 2013 Hardware
  • Spectrum+ Noisey Picture ProblemHi fellow Spec-chums I need your help! I've recently brought a 48K+ Spectrum(issue 6A) that I'm trying to repair. I did all initial tests on it prio…

    Good to get some feedback after a successful repair. I learned something new today, after my recent video signal experience with TR4/TR5. Thanks!
    schombi schombi May 2013 Hardware
  • Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …

    ... sorting out the voltage regulator, TR4 and Coil on the issue ...
    Simon_Carr Simon_Carr June 2013 Hardware
  • Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …

    ... doing the work on the TR4, coil and voltage regulator for ...
    Simon_Carr Simon_Carr June 2013 Hardware
  • Correction of +2 hardware errorsThis is a collection of various pieces of information picked up from various places, including a lot from this forum. I have edited it and reworded i…

    ... have done the switching of TR4, and removed C31, and the ...
    Simon_Carr Simon_Carr June 2013 Hardware
  • Spectrum +2(grey) rf problem not tuning inHi lads, first of all a quick intro. Im a speccy enthusiast in Ireland, had my first speccy when i was seven in 1987(grey +2). Eventually it got repl…

    ... probably due to a shorted TR4 transistor. It is located just ... on the board for the TR4 was printed backwards, so the ... TR4 transistor is fitted in reverse. ... of transistor used for the TR4 on the +2 greys, but ...
    Your Spec-chum Your Spec-chum June 2013 Sinclair Miscellaneous
  • Spectrum +2(grey) rf problem not tuning inHi lads, first of all a quick intro. Im a speccy enthusiast in Ireland, had my first speccy when i was seven in 1987(grey +2). Eventually it got repl…

    ... corrections thread, it seems the TR4 transistor I mentioned is only ...
    Your Spec-chum Your Spec-chum June 2013 Sinclair Miscellaneous
  • +2 issue oneI can't remember seeing this model board before, so here we go: [IMG]http://benophetinternet.nl/hobby/vanmezelf/20130605_153957.jpg[/IMG] [IMG]http…

    Mine looks like this. The tr4 is off to the right and down from the rf mod. Tr1 and 2 are so close theyre touching. Mod datecode is 8422.
    da_hambo da_hambo June 2013 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…

    ... are signs of rework around TR4 and the LM1889 has been ... , so it looks like the TR4 failure took out the LM1889 ...
    balford balford July 2013 Hardware
  • TR1 and TR2 replacementCan anyone tell me the correct replacement part for these? This is for an Issue 4S btw

    The orientation is printed on the silkscreen of the board but I just wanted to be sure due to another transistor (TR4 I think) having to be fitted the other way round on a 4S if you replaced it
    Macc Macc July 2013 Hardware
  • TR1 and TR2 replacementCan anyone tell me the correct replacement part for these? This is for an Issue 4S btw

    I'm more-or-less certain the transistors I suggested will work for all NPN transistors in the 16/48K Spectrums, apart from use as TR4 or TR7. The pin-out may not be the same as the originals - I can't remember, you'll have to check datasheets.
    Zorn Zorn 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…

    ... , the entire lower RAM and TR4/TR5 all show expected readings ...
    schombi schombi July 2013 Hardware
  • Issue 4A issuesHi all, I've been trying to get the Issue 4A board that came DOA with the case I purchased for my Frankenspectrum to work. I've recapped and socket…

    ... swapped out, and TR1/TR2/TR4/TR5 swapped for spares (which ...
    balford balford July 2013 Hardware
  • Repairing a torn trace on an Issue 2 PCBI've found what I think could be the reason for my Issue 2 board not working properly... There is a torn PCB trace beneath one end of where a new ULA…

    ... and b) PSU centred on TR4 ZTX650.

    Faulty RAM ...
    DEATH DEATH August 2013 Hardware
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Latest Posts

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