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<1…16171819202122…34>
  • ZX Spectrum not working... issue 4S?Hi, I've bought a "new" broken ZX Spectrum +. The idea was to put an harlequin board inside, but for the moment I'm trying to put it in working order…

    ... I'll try first changing TR4, TR5, C44 and C45 (as ...
    Zorn Zorn February 2012 Hardware
  • ZX Spectrum not working... issue 4S?Hi, I've bought a "new" broken ZX Spectrum +. The idea was to put an harlequin board inside, but for the moment I'm trying to put it in working order…

    ... got any compatible transistor for TR4 and TR5, but I'll ...
    Zup Zup February 2012 Hardware
  • ZX Spectrum not working... issue 4S?Hi, I've bought a "new" broken ZX Spectrum +. The idea was to put an harlequin board inside, but for the moment I'm trying to put it in working order…

    ... is currently configured. IIRC issue 4S is mostly like issue 4B ...
    RetroTechie RetroTechie February 2012 Hardware
  • ZX Spectrum not working... issue 4S?Hi, I've bought a "new" broken ZX Spectrum +. The idea was to put an harlequin board inside, but for the moment I'm trying to put it in working order…

    ... does not mention an issue 4S. It says about 4B: it ... (22u) is omitted.
    So 4S might have been an attempt ...
    roko roko February 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…

    ... need to rotate the transistor TR4 to get a correct composite ...
    fierman fierman February 2012 Hardware
  • iPhone helpMy better half has been given an old iPhone. It's a 3G model, and she's been told it's jailbroken and unlocked and all that. I've never owned an iPh…

    ... do (only the iPhone 4/4S use a micro-sim).
    Jon Needle Jon Needle February 2012 Chit chat
  • 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…

    ... need to rotate the transistor TR4 to get a correct composite ... will not help.
    Maybe TR4 has low amplification then a ... in the base line of TR4.
    Are you sure your ...
    ingo ingo February 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…

    ... )

    [QUOTE]
    Maybe TR4 has low amplification then a ... in the base line of TR4.
    [/QUOTE]

    I ...
    fierman fierman 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 …

    ... pin 1 (see note about TR4).

    For Peritel:
    TR4 will probably need to be ...
    Zorn Zorn 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…

    ... and -5V lines before exchanging Tr4?[/QUOTE]

    That's ... =gtsamour]Right next to the TR4 transistor (the one already installed ... the right side of the TR4 transistor.[/quote]

    That ... put a BC637 instead of TR4, but maybe it would be ...
    Zup Zup March 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…

    ... put a BC637 instead of TR4, but maybe it would be ...
    gtsamour gtsamour March 2012 Hardware
  • Best game ever?Not sure the best way to do this, thinking top 10s with a sliding scale of 10 points awarded to the game you vote 'best' down to 1 point for your 10t…

    ... run lots of 2s, 3s, 4s and even 6s.

    Rebelstar Rules Rebelstar Rules March 2012 Games
  • 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…

    ... know where to go next.. tr4/tr5 check out ok, so ...
    Asure Asure March 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…

    ... might be in for a Tr4 exchange, mentioned in so many ...
    roko roko March 2012 Hardware
  • 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…

    ... /> you must desolder the transistor TR4 (2N3904), and solder it again ...
    LCD LCD 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…

    [QUOTE=LCD;608406]you must desolder the transistor TR4 (2N3904), and solder it again in reverse direction. This will repair the picture.[/QUOTE]

    Was this a production fault?
    Scottie_uk Scottie_uk 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…

    ... i desoldered a known good TR4 from my other toastrack. this ... burnt.

    I pulled TR4 again and it's still ...
    Asure Asure March 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…

    I bet it came from TR4 but you disconnected power soon ... on my 128k toastrack the tr4 kept dieing very soon after ... coil was shorted so the tr4 wasn't osscilating and soon ...
    gtsamour gtsamour March 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…

    TR4 still checks out OK and ...
    Asure Asure March 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…

    ... 128k is back alive!
    TR4 was indeed the culprit.
    tr4. Thanks for all that replied ...
    Asure Asure March 2012 Hardware
  • ZX Spectrum TowerHi all, i am working on a ZX Spectrum 48K build in a PC tower case. Is there anyone who did it before? I have some questions duo the PSU. I have to g…

    ... power circuit with a new TR4 some weeks ago (thanks to ...
    Asure Asure March 2012 Hardware
  • Lot's of Sinclair parts and sparesI have really a lot spares at home, like: - ULA's - All kinds of RAM chips Many of these parts have already been tested. Most of these parts are pu…

    ... some kid's science experiment, tr4 was blown, and wire parts ...
    Asure Asure March 2012 Sales
  • Lot's of Sinclair parts and sparesI have really a lot spares at home, like: - ULA's - All kinds of RAM chips Many of these parts have already been tested. Most of these parts are pu…

    ... some kid's science experiment, tr4 was blown, and wire parts ...
    bverstee bverstee March 2012 Sales
  • TR4 is goneMy TR4 transistor is burned. Can I replace this transistor with a TIP31B or C ? My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :) My Spectru…

    Yes Tr4 is gone, do not connect ...
    roko roko April 2012 Hardware
  • TR4 is goneMy TR4 transistor is burned. Can I replace this transistor with a TIP31B or C ? My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :) My Spectru…

    Sounds like something draws too much current. Maybe one or some of the 4116 have a internal short circuit and killed TR4 this way?
    LCD LCD April 2012 Hardware
  • TR4 is goneMy TR4 transistor is burned. Can I replace this transistor with a TIP31B or C ? My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :) My Spectru…

    Hmmmm... I don?t know much about electronics. :)
    I?m only trying to learn fixing thie Speccy.
    Without the TR4, it turns on normally. But the voltages of 4116 are wrong.
    So if a 4116 is faulty, the TR4 can burn?
    Turrican Turrican April 2012 Hardware
  • TR4 is goneMy TR4 transistor is burned. Can I replace this transistor with a TIP31B or C ? My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :) My Spectru…

    Yes, running with a dead TR4 can kill ram chips and ... short circuit so will kill TR4.

    If your ram ...
    guesser guesser April 2012 Hardware
  • TR4 is goneMy TR4 transistor is burned. Can I replace this transistor with a TIP31B or C ? My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :) My Spectru…

    TR4 is prone to failure if ...
    Zorn Zorn April 2012 Hardware
  • TR4 is goneMy TR4 transistor is burned. Can I replace this transistor with a TIP31B or C ? My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :) My Spectru…

    ... other suspects: TR5 (cooperates with TR4) and the coil. Cutting the ...
    roko roko April 2012 Hardware
  • TR4 is goneMy TR4 transistor is burned. Can I replace this transistor with a TIP31B or C ? My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :) My Spectru…

    ... BC compatible transistor (to change TR4).
    I bought TIP 31 ...
    Turrican Turrican April 2012 Hardware
<1…16171819202122…34>

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  • 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…
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