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Search Again :: Adv Search 1000 results in 0.004s
<1234567…34>
  • 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 ... /> Once 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
  • Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …

    Where would the 12V be on the LM1889N? I ... but none anywhere near 12v.

    TR4 gives voltages of 6 ...
    rune rune November 2014 Hardware
  • Toastrack - faint monochrome displayHi all, I've got a Toastrack with a video issue on both RGB and RF. I get a faint monochrome screen: on one LCD display it is predominately white,…

    ... />
    I've got a Toastrack with a video issue on ... 'm getting about 2V, not 12V, so this is the likely ... TR3, 4, 5 & 6. TR4 (swapped for a TXR651) has ...
    JollyBoyJohn JollyBoyJohn February 2017 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…

    ... fail. I checked my working toastrack, and it has these readings ... this the right way:
    TR4 (CBE) 11.3/11.2 ...
    Asure Asure March 2012 Hardware
  • TR4 continues blowing up!The TR4 of my Speccy Issue 3 continues burning even after I changed all electrolytic capacitors and the BA157 diode. If these things serve only to h…

    The TR4 of my Speccy Issue 3 ... only to have -5V and +12V, can I remove all 4116 ... , add 4164 and use a +12V power supply instead of a ...
    Turrican Turrican May 2012 Hardware
  • Replacing ZTX650 with BD139Today I blew up one of the GALs on one of my DivIDEs while testing on my Toastrack. Shorted M1 with 12V and the 12V circuit broke. I had to replace T…

    ... on my Toastrack.
    Shorted M1 with 12V and the 12V circuit broke ... .
    I had to replace TR4 ... experience with the BD139 replacing TR4 in this circuit ?
    Knik Knik September 2012 Hardware
  • Almost no picture on a toastrack Issue 6UI?d need some help with a toastrack, that hardly shows any picture on both the RF and RGB. It?s totally distorted. I had this before and I remembered…

    ... need some help with a toastrack, that hardly shows any picture ... and I remembered that replacing TR4/TR5 did help. However, this ...
    schombi schombi January 2014 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…

    ... are very low - missing the +12V and -5V rails.
    ... I had some confusion with TR4. Looking at all the ... board. Photos show that TR4 should be installed in ...
    I've since replaced TR4 (marked ZTX650) with a new ... about what happened to TR4? It looks like it ...
    Tekno Venus Tekno Venus February 2015 Hardware
  • 12V Rail - Spectrum 48kOkay - I may just be having a senior moment here, but I'm running out of ideas. I'm working on a Spectrum Issue 4S board,and have had to remove al…

    ... the RAM with sockets, replaced TR4 and TR5 (C2236 and A733 ... -5V are fine, but the 12V rail is at almost 25V ... , and the rail there was 12V as expected.

    Has ...
    Graham Graham November 2015 Hardware
  • 12V ripple with lower ram installedI repaired a speccy this week. Before doing anything I replaced all caps and measured the transistors in the power section. When doing this I found t…

    ... When doing this I found tr4 and tr5 missing so put ... on and measured the voltages, 12v was giving me an extreme ... with the ram removed. 12V line was fine with a ... picture. Looked at the 12v line and there is a ... causing the instability in the 12v line, it's ruining ...
    patzik patzik April 2016 Hardware
  • 128K Toastrack (Noisy video output)Hello there guys! Need all of yours guides and advices. Some time ago I bought a nice looking 128K from eBay (motherboard v6K) and put it aside for…

    ... ones, 7805 voltage regulator, TR4 and TR5 transistors.
    ... br />
    Pin B23 -12V
    [img]https://lh3.googleusercontent ... br />
    Pin B22 +12V
    [img]https://lh3.googleusercontent ... Obviously something is wrong with -12V, but I have no ...
    PheeL PheeL April 2017 Hardware
  • Finally got myself a 128k toastrack too ! :)Hi all, I recently bought a vintage computers lot on eBay, just because there was a toastrack inside (and a better looking CPC 6128 with edge conne…

    ... , just because there was a toastrack inside (and a better looking ... 's, 2 pong...).
    The toastrack was giving a blank ghost ... v instead of 12... Changing TR4 and 5 resolved the problem ...
    bugpat bugpat January 2018 Hardware
  • 12V missing on an issue 3I’ve been working on an issue 3 Spectrum +. It shows thin distorted vertical stripes on bootup. +5 and -5V are all right but the 12V line measures ro…

    ... are all right but the 12V line measures roughly two volts ... the 4116s and changed the TR4 and TR5 to no avail ... the other place that uses 12V is the LM1889, which is ...
    protek protek July 2020 Hardware
  • The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…

    ... some microseconds before the +12v and -5v supplies (generated ... shorting the -5 or +12v outputs at the edge ... M1 is right next to +12v). Fortunately, the Ferranti ULA ... of 10 it's TR4 that's gone pop ... br />
    The 128K toastrack also has this little SMPS ...
    Winston Winston September 2010 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…

    ... desoldered a known good TR4 from my other toastrack. this one measure ... /> Placed it into the broken toastrack, powered on, and things were ... burnt.

    I pulled TR4 again and it's still ... news is, there is now +12v in the system. The bad ...
    Asure Asure March 2012 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…

    ... just got hold of a toastrack, which is kind of strange ... % sure you are missing the +12V. Do you have a DMM ... diode test? If so, remove TR4 and check it, it's ...
    Falco-F8L Falco-F8L May 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…

    ... is a Z70700 so has TR4 in the correct orientation (Ben ... ? I suspect noise on the +12v line but don't have ... worth pointing out that my toastrack is nice and clear using ...
    balford balford October 2013 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…

    Just to add a TR4/5 failure and consequent lack of +12v on a toastrack would take out RF and composite outputs, but RGB should still work (as that's generated by the ULA and not processed by the TEA2000).

    B
    balford balford 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…

    ... a TR4/5 failure and consequent lack of +12v on a toastrack would ... ) come from the TEA2000. No 12V = No TEA2000 = No Sync and ... the TV signal because the 12V isn't used for the ...
    Spirantho Spirantho January 2015 Hardware
  • ToastrackYay! I now have a toastrack 128K. It even works (the TV modulator's a bit dodgy though). I've wanted one since like 1986.

    Yay! I now have a toastrack 128K. It even works (the TV modulator's a bit dodgy though). I've wanted one since like 1986.
    Winston Winston March 2007 Hardware
  • PC Power supply for SpeccyHi all, after 13 years with out playing spectrum games I am eager to play the old games. Thus I got up to the garret checking my old stuff. Two of m…

    ... . It misses the -5V and +12V at the 4116 (lower?) RAMs ... usual the Power Unit with TR4 and TR5. It brakes rather ... which delivers the -5 and +12V direct to the RAM. The ... are the 9V and the -12V are used anywhere in the ...
    maskenlos maskenlos August 2007 Hardware
  • Which ROM for 128 ToastrackHi I have a Spectrum 128 Toastrack which has a missing ROM chip. I have an Eprom blower and a few 27256-25 Chips. I have looked on the Spectrum ROM …

    Hi

    I have a Spectrum 128 Toastrack which has a missing ROM chip. I have an Eprom blower and a few 27256-25 Chips. I have looked on the Spectrum ROM website but cannot decide which is the right one.
    Martin Baugh Martin Baugh December 2007 Hardware
  • +12v/-12v/9v and peripherals?Do any peripherals use the +12v, -12v or 9v lines exposed at the edge connector? Firstly, if they use +9v they won't work on a +3, since the +3 does…

    Do any peripherals use the +12v, -12v or 9v lines exposed at ... traces down to pass the +12v/-12v through, so I'm looking ...
    Winston Winston March 2008 Hardware
  • Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…

    ... manual I have to replace TR4 and TR5.
    These type ... transistors are for creating +12V and -12V. So probably I can use ...
    65C02 65C02 June 2008 Hardware
  • Issue 3B problemHi! I have an issue 3B board that is having a strange problem: when I got it it didn't had the -5V and +12v, as usual. After replacing TR4 and TR5 t…

    ... the -5V and +12v, as usual. After replacing TR4 and TR5 the ... -5V came back, but the 12V are ...
    Hernán Pablo Álvarez Hernán Pablo Álvarez April 2009 Hardware
  • Spectrum+ 128 (toastrack) - tuning issueI remember a post from a while ago where [COLOR=Blue]Winston [/COLOR]said his [COLOR=Red]toastrack[/COLOR] had horrendous [COLOR=SeaGreen]drift [/COL…

    ... [/COLOR]said his [COLOR=Red]toastrack[/COLOR] had horrendous [COLOR=SeaGreen ... my first ever [COLOR=Red]toastrack [/COLOR]machine today which was ...
    szeliga szeliga April 2009 Hardware
  • Spectrum 128+ (No TV picture)I got a Spectrum 128+ which is not generating any picture. I checked the TEA2000, and it gets not 12 Volt, but only 1.4, so this is the problem, I gu…

    ... and 9V are all okay, -12V is in reality +11.4 ... headphones.
    What to replace? TR4? C44? I cannot read the ...
    LCD LCD March 2010 Hardware
  • VCF report and photosNot sure where to put this, exactly...but here it is, what went on at the Vintage Computing Festival at Bletchley Park last weekend. Finally I've fo…

    ... one of my dead 128K toastrack machines, fortunately Chris Smith had ... was wrong with it was TR4 was dead and the keyboard ...
    Winston Winston June 2010 Sinclair Miscellaneous
  • Toastrack border changes colour with joystickI plugged my Kempston joystick interface into my 128K toastrack last night and had a blast on Beach Head. Funny thing is, the border colour changed…

    ... joystick interface into my 128K toastrack last night and had a ...
    szeliga szeliga December 2010 Hardware
  • 128 ToastrackHi All Just my hands on a 128 Toastrack and have a couple of questions. OK, I have never ever used one of these before so please excuse my ignoran…

    ... my hands on a 128 Toastrack and have a couple of ...
    Chris A Chris A December 2010 Hardware
<1234567…34>

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  • Toastrack.... with no toastrack?![url="http://www.ebay.co.uk/itm/272028658596?_trksid=p2055119.m1438.l2649&amp;ssPageName=STRK%3AMEBIDX%3AIT"]ebay.co.uk/itm/272028658596?_trksid=p205…
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  • Which ROM for 128 ToastrackHi<br /> <br /> I have a Spectrum 128 Toastrack which has a missing ROM chip. I have an Eprom blower and a few 27256-25 Chips. I have looked on the S…
  • 2x Rubber Key Spec, 48K Plus and Toastrack 128K for saleI've got a few Speccies on EBAY at the moment - <br /> <br /> 2x rubber key 48K (working but need membranes)<br /> 1x Speccy+ (working, ne…
  • Spectrum+ 128 (toastrack) - tuning issueI remember a post from a while ago where [COLOR=Blue]Winston [/COLOR]said his [COLOR=Red]toastrack[/COLOR] had horrendous [COLOR=SeaGreen]drift [/COL…
  • speccy 128 toastrack joysticksDoes the RS232 port (or the keypad port) work as a joystick port on the toast rack, and if so what 'system' is it...interface 2 or kempston?<br /> <b…
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