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<1234567…34>
  • ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…

    ... Normally the lower 16K is 4116 ram. These two ramchips are ... (and limiting the the ram to 32K in the ... powersupply for both chips.
    4116: Pin1 = -5V, Pin8= + ... to fry the lower ram if TR4/TR5 blow up.
    ... 32K is also 4164 ram, then this spectrum has ...
    Rorschak Rorschak July 2014 Hardware
  • Issue 4A, tests complete fine but get odd crashing problemHi all, I've got an issue 4A which has had all of its lower RAM replaced, TR4, TR5 as well as its CPU. It originally had quite high voltages (20-3…

    ... had all of its lower RAM replaced, TR4, TR5 as well as its ... very questionable RAM. TR4 and TR5 were replaced and with new RAM it appeared ... I've tried swapping the RAM chips around and have swapped ... difference. The voltages on the RAM appears fine.

    ...
    Jet5y Jet5y May 2016 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…

    ... coil, the entire lower RAM and TR4/TR5 all show expected readings. Now ...
    schombi schombi July 2013 Hardware
  • Issue 4A, tests complete fine but get odd crashing problemHi all, I've got an issue 4A which has had all of its lower RAM replaced, TR4, TR5 as well as its CPU. It originally had quite high voltages (20-3…

    ... the joints on the lower RAM, CPU and caps (I recappped ... whether it was after the RAM and TR4/TR5 was replaced or not ... . My own RAM is clearly a bit ... an error. I ran the RAM test again after Manic Miner ...
    Jet5y Jet5y June 2016 Hardware
  • TR4/TR5 replacementHi guys, I've got another Spectrum I'm working on now - an Issue 4S this time. When I originally got it, I powered it up and did the basic tests a…

    ... with the upper 32K of RAM. Not surprising, and I' ... the voltages on the lower RAM IC's show they ... know I need to replace TR4 and TR5 in order to get ...
    I've since replaced TR4 (marked ZTX650) with a new ... lower RAM IC's, so I'm planning to replace TR5 later ...
    Tekno Venus Tekno Venus February 2015 Hardware
  • Help changing TR4 and TR5Hi all! Please, help me! :) I think I'm not understanding the correct pins of TR4/TR5 and the transistors. So, if anyone know the correct pins, help …

    ... understanding the correct pins of TR4/TR5 and the transistors.
    So ... and BC307 to use in TR4/TR5.
    And I found some ... original pins that?

    TR4 TR5 TR4 TR5

    E C |\ /|
    Turrican Turrican April 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 : …

    ... 4116 RAMS as I suspect they are dead, and have replaced TR4 ... & TR5, as faulty RAM can often ... decoupling caps for the RAM, just in case one ... br /> It think the TR4/TR5/L3 circuit must be working ... anywhere other than the RAM ? as that might ...
    prime prime July 2012 Hardware
  • Replacing lower RAM 4116 ZX Spectrum 48k - desoldering advice please?A long post, but interesting pictures perhaps. :) I'd like some advice: (also apologies I think I picked the wrong 'Hardware' category for this, plea…

    ... seemed to indicate a lower RAM issue. It hadn't ... from retroleum.co.uk: four 4116 chips, nine 16-dip ... to desolder and remove the 4116, replacing them with a ... place and installed a new 4116 but the pattern is ... A4 line from the neighbouring 4116, so I have to ...
    Kamineko Kamineko September 2017 Hardware
  • upper ram tacks / TR4 socket...[url="https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7"]https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7[/url] you can only replace that pesky TR4 so many t…

    ... can only replace that pesky TR4 so many times .... surprises ... me that with TR4 not in place or when ... would just fry the lower ram again .. this is one ... like somebody attacked the upper ram with a black and ... for replacing the upper ram tracks ?
    mark8bit mark8bit September 2020 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    ... from watching the video: Lower RAM or the ROM is defective ... /> Check the the 4116 (lower 16K of RAM) have all correct voltage ... power circuits around TR4/TR5. A common fault is TR4 (ZTX650) - this poor ...
    RST#08 RST#08 March 2010 Hardware
  • damaged spectrum+ (blinking squares)Hi, Sorry for my poor english, but I couldn't find on family forums any remedy for my hardware problem with my first speccy in my life :) I've bought…

    ... serves video + lower 16K RAM chips (4116 or equivalent type). Very common ... 1 or more of the 4116 DRAMs.

    The ... news: finding replacements for TR4, TR5 or 4116 DRAMs may not be easy ... makes diagnosis of if/which RAM chips are gone, difficult.
    RetroTechie RetroTechie May 2010 Hardware
  • damaged spectrum+ (blinking squares)Hi, Sorry for my poor english, but I couldn't find on family forums any remedy for my hardware problem with my first speccy in my life :) I've bought…

    ... news: finding replacements for TR4, TR5 or 4116 DRAMs may not be ... br />
    Removing the RAM needn't be a pig ... of them are bad. 4116 RAM comes up on ebay from ... series logic to 128K static RAM and CPUs). So don ... good before putting in new RAM. Once you've put ...
    Winston Winston June 2010 Hardware
  • 2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…

    ... they're from the 4116 chips? I checked them ... voltages on the lower RAM chips - the above ... keyclick, ULA (most likely) or RAM / ROM / Z80 fault.
    4116 chips, the things aren ... -board voltage conversion circuitry (TR4/TR5 IIRC), but if caused ...
    RetroTechie RetroTechie February 2011 Hardware
  • Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…

    The lower 16K of RAM is formed by IC6-IC13 ... supply connections to the lower RAM that led to the failure ... and correct that, any replacement 4116 ICs you install will probably ... possible one or both of TR4/TR5 have failed. Carefully note the ...
    Zorn Zorn February 2012 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 …

    ... the 4116 RAM then it's highly recommended, as failure of TR4/TR5 will ...
    balford balford August 2014 Hardware
  • Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …

    ... RAM - this means the voltage converter circuit based around TR4 ... suspect at least one shorted 4116 chip - so see ... remove all the lower RAM chips anyway, so personally ... At this stage, replace TR4/TR5 if you don't get ... If it fails, then upper RAM, CPU/ROM can be ...
    DEATH DEATH August 2014 Hardware
  • Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …

    ... RAM - this means the voltage converter circuit based around TR4 ... at least one shorted 4116 chip - so see ... remove all the lower RAM chips anyway, so personally ... At this stage, replace TR4/TR5 if you don't get ... I'll remove the lower ram, check the voltages, fit ...
    Spekkie Spekkie August 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…

    ... .

    With the 4116 "lower" RAM chips removed, you reduce the ... (TR4, TR5 and the coil etc.).

    Also with the 4116 chips ... the state of TR4, TR5 and the coil. If TR4, TR5 or the coil ...
    1024MAK 1024MAK September 2014 Hardware
  • Spectrum 48K Ferranti ULAIs there anywhere to get hold of the ICs in the subject? Martin

    ... TR4/TR5 transistors).

    Check voltages on one of the lower RAM ... , remove all the lower RAM IC's (replacements are ... />
    Then replace TR4/TR5, see if all voltages are ... either new old stock 4116's or a LRR ... due to a faulty 4116 IC placing +12v on ...
    balford balford February 2015 Hardware
  • TR4/TR5 replacementHi guys, I've got another Spectrum I'm working on now - an Issue 4S this time. When I originally got it, I powered it up and did the basic tests a…

    ... , I've now removed my TR4 from the inner set of ... replace TR4/TR5.

    I've also just ordered 8 4116 chips ... from Ben V to replace the lower RAM ICs ... . I am tempted to replace TR4, TR5 and IC8 and then power ...
    Tekno Venus Tekno Venus February 2015 Hardware
  • 48k Issue 6a Very sick indeed.Hi Guys. I have a 48k Issue 6a board that shows a white screen with grey border. The white screen has three black squares spaced equally on the le…

    ... Now, this is important. The 4116 (or equivalent) "lower" DRAM chips ... will kill TR4. Or kill TR4 and TR5. Or kill TR4, TR5 and the ... DRAM chips (all the 4116 "lower" RAM chips and I recommend ... sorted, plug the 4116 (or equivalent) "lower" RAM chips back in. ...
    1024MAK 1024MAK October 2017 Hardware
  • 48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…

    ... functional (it reads screen RAM and creates the video signal ... all in the lower RAM area, which had been ... that a failing upper RAM IC can interfere with ... following:-
    At the 4116 DRAM chips, test the + ... I should also test TR4 & TR5 out of circuit?
    dozey_dustman dozey_dustman December 2017 Hardware
  • help with issue 3 48k speccy after recap and new tr4 and tr5I have a 48K speccy that was not working. After recapping and replacing TR4 and TR5 it came back to life However after a short while running weird …

    ... are off.

    TR4, TR5, the coil (actually a transformer ... />
    The 'lower' RAM chips (type 4116 or equivalent) require three ... supplies present can damage the 4116 RAM chips.

    ... likely caused by a faulty RAM chip.

    ...
    1024MAK 1024MAK July 2018 Hardware
  • ZX Spectrum + Issue 6A Repair attemptHello everybody! I got ZX Spectrum + which doesnt work properly. On power up I can see color mosaic, then paper goes black and i can see thin red ba…

    ... all 4116 with no effect, voltages are good (i replaced LM7805,TR4,TR5 ...
    emes30 emes30 July 2010 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…

    ... the logic chips for upper RAM mounted in sockets.
    - Lower ... I'll try first changing TR4, TR5, C44 and C45 (as suggested ...
    Zup Zup February 2012 Hardware
  • Project #1 : Speccy 128k+2 with diVide inside...Hi guys, I just have finished my Super Spectrum #1 The idea (I was thinking of that since 2007) was to fit an english grey +2 motherboard in a +2A…

    ... out), and to refit the TR4, TR5 and TR7 (2N3904) the right ... /> my last non working grey (ram dead) will maybe have the ... it : I will remove the ram on a CPC 464, and ...
    bugpat bugpat April 2013 Hardware
  • 16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…

    ... based replacement for the lower RAM that works in all 16K ... the column address to the RAM and so there isn't ... that appear on the lower RAM address lines. In particular, in ... is the ZX Spectrum Lower RAM Replacement Module, pictured below:
    Zorn Zorn May 2013 Hardware
  • 48k - Why Won't it Buzzzz?Hi WOS ;) I bought a load of Spectrum games off eBay and thrown in for good measure was a 48k 1984 Issue 6a circuit board that I was told was for sp…

    ... /> The voltages around the lower RAM ICs are all wrong however ... thinking along the lines of TR4/TR5 having been blown, so I ... appears I know the lower RAM is faulty (alternating black & ... all work fine. The upper RAM has been removed and donated ...
    retrogamemart retrogamemart September 2014 Hardware
  • Issue 2 Spectrum - Black screenHi I have an issue 2 spectrum which I'm having some issues with. I bought it on ebay so have no idea of the history or how it came to be broken. Whe…

    ... fine but TR4 was faulty.
    I replaced TR4 & TR5 and replaced ... ) to get the corresponding upper RAM location and sure enough IC ... /> I replaced the offending upper RAM chip but it made no ... swapped some of the lower RAM chips about to different sockets ...
    whoremoan whoremoan November 2014 Hardware
  • I broke my 48k Speccy!!!!Hey guys, I am looking for some advice, I hope you can point me in the right direction. So, I went about replacing all the capacitors on my issue 4…

    ... The voltages on the lower ram are well out of whack ... checked the voltage regulator, TR4 and TR5 and as far as ...
    I have noticed that TR4, TR5 and C74, C46 are getting ... secs. I checked TR4 and TR5 and they are still ... issues with my lower ram now due to the ...
    RSwipeCA RSwipeCA December 2014 Hardware
<1234567…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
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    mel the bell on April 21
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    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
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    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

HitBox

Word Docs Hits
ram 12.6K 21.4K
4116 933 1.4K
tr4 886 1.3K
tr5 555 806

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  • Help changing TR4 and TR5Hi all!<br /> Please, help me! :)<br /> I think I'm not understanding the correct pins of TR4/TR5 and the transistors.<br /> So, if anyone know the c…
  • 4116 Ram chip replacements?Hello. I am in the work of gathering replacement parts for my speccy 48k. And I would like to know what chips is good replacement for the 4116 ram ch…
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