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Search Again :: Adv Search 1000 results in 0.003s
<1234567…34>
  • Voltage regulator replacement?I have an 48K issue 3B that has (for unknown reasons) had one of the legs on the voltage regulator broken off. It looks like a simple replacement job…

    ... of the legs on the voltage regulator broken off. It looks ...
    cg cg November 2005 Hardware
  • Missing Voltage RegulatorHello all and a very merry 2-days-after-the-speccys-25th-birthday to you all! Okay, I've just received my brand spanking new 48K keyboard membranes …

    ... odd reason ripped off the Voltage Regulator and heatsink. Is there ...
    miner49er miner49er April 2007 Hardware
  • Voltage SchmoltageOk then. Don't flame for wanting to use a C64 tape deck for this - it was the only one I have to hand which may be cannibalised for the purpose. So …

    ... . But where to get this voltage from? I know that we ...
    wilsonsamm wilsonsamm July 2007 Chit chat
  • how to set voltage regulator to the correct setting ?On the power supply that is broken it says AC adapter INPUT : 230v 50Hz OUTPUT ; 9v 200mA Regulated On the variable voltage adapter i have the…

    ... />

    On the variable voltage adapter i have there is ... do to set the correct voltage ?
    swordheart swordheart September 2007 Chit chat
  • How to fix dc voltage on a 48+ psuAfter dinner, after a womble video out mod on a "new" purchased 48+ , just in the remaining time I tested the voltage of its psu and, surprise surpr…

    ... remaining time I tested the voltage of its psu and, surprise ... pcb for trimming the output voltage. Can I add a resistor ... to trim the voltage to a more cool 9 ...
    Cignale Cignale June 2010 Hardware
  • Fuzzy Screen On 48k Spectrum.Hi there. I bought a Spectrum off eBay last week (another for my collection lol), and it suffers with a fuzzy screen e.g. it looks like interference …

    ... & c25 and changed transistor tr4, but it's still the ... the jack plug to the voltage reg are fine all the ... (+) leg of c46. The (-) leg voltage is way down compared to ...
    Jimbob-Squarepants Jimbob-Squarepants January 2011 Hardware
  • Spectrum 48k PSU voltageI have been running into problems with my rubber key speccy. To cut a long story short I did a voltage check of my power supply. It seems to fluctuat…

    ... story short I did a voltage check of my power supply ...
    pasty72 pasty72 February 2011 Hardware
  • Newbie question about my unwell Spectrum...Hi - I have had a couple of dud 48K Issue 3 Spectrums in the loft for 20 years or more. One would initialise sometimes but could not be guaranteed t…

    ... has been fixed by replacing TR4.

    The second machine ... to be the originals. The voltage on pin 1 is -4 ...
    weathereye weathereye February 2011 Hardware
  • Spectrum +2's and TR4...?Hi people, I saw mentioned in another thread (+2 composite mods) that TR4 is the wrong way round on grey +2's. Can someone give me more info on this…

    ... thread (+2 composite mods) that TR4 is the wrong way round ...
    Spirantho Spirantho April 2011 Hardware
  • Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …

    ... , I applied power again. The voltage readings were the same as ... PSU.

    I changed TR4 for a new ZTX651 and ... . The PSU limiter operated and TR4 became warm, hopefully it hasn ... is causing excessive current through TR4. In circuit, the mini-transformer ...
    Zorn Zorn December 2011 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…

    My TR4 transistor is burned.
    Can ... ?

    Could be the TR4 the problem of colour, too ...
    Turrican Turrican April 2012 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.
    TR4/TR5.
    And I found ... original pins that?

    TR4 TR5 TR4 TR5

    E ...
    Turrican Turrican April 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 ...
    Turrican Turrican May 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 : …

    ... -5V in fact, measuring the voltage on this line leads to ... are dead, and have replaced TR4 & TR5, as faulty RAM ... .

    It think the TR4/TR5/L3 circuit must be ...
    prime prime July 2012 Hardware
  • THE VOLTAGE OF THE POWER SUPPLY UNITCould anybody who has a ZX Spectrum 128k +2 count with a voltameter the voltage which the power supply unit gives to the Spectrum and tell me the [B]…

    Could anybody who has a ZX Spectrum 128k +2 count with a voltameter the voltage which the power supply unit gives to the Spectrum and tell me the [B]exact[/B] reading?
    George George August 2012 Hardware
  • The great 128k ConversionWell, I am not sure if it is going to be great. Hopefully it will! This evening, I set about getting my Issue 6A Spectrum Plus working. I suspecte…

    ... to remove TR4 and TR5. I had already replaced the voltage regulator ... a cupboard.

    Putting TR4 and TR5 on a transistor ... that TR5 was Ok, but TR4 had a short across one ... was soldered in, and the voltage levels tested. All lines were ...
    ramsrc ramsrc October 2012 Hardware
  • Issue 2 video problemHello all, Need some help with an issue 2 board that I 'm trying to restore. I've replaced all the electrolytic capacitors, changed the voltage regu…

    ... the electrolytic capacitors, changed the voltage regulator, tr4, and a Zener and ...
    Pluto63 Pluto63 December 2012 Hardware
  • Flashing coloured blocks - diagnosisHiya, hope this is the right place for this... Was given an Issue 2 48K by a someone yesterday that hasn't been powered on in 20 years, which works …

    ... is either down to the voltage regulator, TR4 transistor, ULA, or RAM ... into the Speccy), and the voltage regulator which gets 10.88V ...
    junosix junosix April 2013 Hardware
  • Plus D Voltage Regulator OrientationHi, I?ve got a Plus D Disc Interface circuit board without case from a friend. Sadly he sends it to me without care for proper packaging. So it arr…

    ... arrived to me with the voltage regulator hanging around,
    ... sure about the orientation the voltage regulator was soldered.
    ... wrong.

    The voltage regulator has printed "F M0247 ... must install a newly buyed voltage regulator.

    ...
    Luzie Luzie April 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…

    ... come out as expected (including TR4 and 5) but the problem ... when I start running the voltage tests on the lower RAM ...
    Simon_Carr Simon_Carr May 2013 Hardware
  • Voltage converter question.I recently paid over $100 for a really solid nice looking 750 watt 110v to 220 v converter so that I can run some my UK appliances when they come ove…

    ... />
    However, this second 'cheapo' voltage converter does not appear to ... any side effects with the voltage converter?
    Scottie_uk Scottie_uk September 2013 Chit chat
  • Black Screen Spectrum 48kWas working ok, it came to me in a Fuller FDS keyboard, I had a nose inside and found a floating power lead connected to the keyboard, I removed that…

    ... />
    Went through and checked TR4 and TR5 (all test ok ... : #2 Lower RAM chips have voltage at:

    -4.85v ...
    OttO OttO December 2013 Hardware
  • Interesting 48K failureI thought I'd recount a failure I've not seen mentioned before that I saw tonight while fixing a 48K issue 6 board. The background: The initial fail…

    ... the 48K board gets shorted. TR4 is usually a casualty, as ... , -5v was now present, so TR4 had actually survived the ordeal ... was just loading this supply voltage too much. Putting in sockets ... with R27 could mean the voltage at the junction of of ...
    Winston Winston December 2013 Hardware
  • TR4 or TR5?My issue two gives horizontal bars on bootup. Flicking reset takes it to copyright screen though. I measured voltages and got 4,9V, 11,99V and -4,3V.…

    ... of threshold but was it TR4 or TR5 that needs changing ...
    protek protek May 2014 Hardware
  • ZX Spectrum +2 (grey case) voltage converter circuit oddity.I'm working on repairing one of these and have encountered a possible problem and I'm not sure what I can best do about it, if anything needs to be d…

    ... circuit board that houses the voltage converter circuit (top right) had ... /> Measuring the outputs of the voltage converter circuits in both Spectrums ... have a diagram of the voltage converter circuit to hand while ...
    Zorn Zorn 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…

    ... />
    I checked the voltage regulator, TR4 and TR5 and as far ... left hand leg on the voltage regulator using the 200k meter ... />
    I have noticed that TR4, TR5 and C74, C46 are ... about 45 secs. I checked TR4 and TR5 and they are ...
    RSwipeCA RSwipeCA December 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…

    ... I need to replace TR4 and TR5 in order ... I had some confusion with TR4. Looking at all the ... board. Photos show that TR4 should be installed in the ...
    I've since replaced TR4 (marked ZTX650) with a new ... ideas about what happened to TR4? It looks like it ...
    Tekno Venus Tekno Venus February 2015 Hardware
  • Tr5 tr4I need to replace tr4 and tr5... What arr the fine replacement equivalent? I see the sinclair logo copyright but is distorted and in two line... Ca…

    I need to replace tr4 and tr5... What arr the fine replacement equivalent?
    I see the sinclair logo copyright but is distorted and in two line... Can everyone help me? Is a zx spectrum+ iussue 4b
    Thaks
    Puglisia Puglisia May 2015 Hardware
  • Power issues on a 6A 48 K SpectrumHello all! I decided to take another look at my 6A Spectrum that I broke via a bad joystick adapter, I’ve removed the bottom 16K ram and replaced…

    ... bottom 16K ram and replaced TR4 and TR5 to no avail ... left hand leg of the voltage regulator gives a reading of ... wrong too.

    [b]TR4 Test:[/b]
    This seems ...
    Korinel Korinel November 2015 Hardware
  • Issue 2 48k Yellow DisplayHi guys. As the title says, I have an issue 2 that's displaying the typical yellow/green colour screen at switch on. The picture is clear and stab…

    ... in the correct polarity.
    TR4 TR5 removed, checked tested good ... one, no difference.
    Replaced voltage regulator.
    Tried to adjust ...
    RSwipeCA RSwipeCA September 2016 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
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

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Related Threads

  • Voltage regulator replacement?I have an 48K issue 3B that has (for unknown reasons) had one of the legs on the voltage regulator broken off. It looks like a simple replacement job…
  • Missing Voltage RegulatorHello all and a very merry 2-days-after-the-speccys-25th-birthday to you all!<br /> <br /> Okay, I've just received my brand spanking new 48K keyboar…
  • Voltage SchmoltageOk then. Don't flame for wanting to use a C64 tape deck for this - it was the only one I have to hand which may be cannibalised for the purpose.<br /…
  • how to set voltage regulator to the correct setting ?On the power supply that is broken it says <br /> <br /> AC adapter<br /> INPUT : 230v 50Hz<br /> OUTPUT ; 9v 200mA<br /> Regulated<br /> <br /> <b…
  • Spectrum 48K input voltageI have a power supply that is rated 9,5 Volts DC. <br /> With no load it outputs about 9,86 Volts. <br /> <br /> Is it safe to use it for ZX Spectrum…
  • How to fix dc voltage on a 48+ psuAfter dinner, after a womble video out mod on a "new" purchased 48+ , just in the remaining time I tested the voltage of its psu and, surprise surpr…
  • Spectrum 48k PSU voltageI have been running into problems with my rubber key speccy. To cut a long story short I did a voltage check of my power supply. It seems to fluctuat…
  • Spectrum +2's and TR4...?Hi people,<br /> <br /> I saw mentioned in another thread (+2 composite mods) that TR4 is the wrong way round on grey +2's. Can someone give me more …
  • Issue 2 voltage troubleDear all, <br /> <br /> I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it.<br /> <br /> After …
  • TR4 is goneMy TR4 transistor is burned.<br /> Can I replace this transistor with a TIP31B or C ?<br /> My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :)…

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