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<1…21222324252627…34>
  • 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…

    ... /> Is there any testing of voltages that can be done to ...
    Simon_Carr Simon_Carr May 2013 Hardware
  • CapacitorsSorry, another question... I've done a bit of looking around, although after a couple of beers this may not have been as systematic as usual, but I …

    ... in a diode bridge rectifier circuit will depend ... ? of the diode bridge rectifier. The red waveform is ... output of the bridge rectifier. The blue waveform ... co.za/wos/cap discharge rectifier.gif[/IMG]
    ... used in a diode bridge rectifier circuit.

    ...
    Pierre Pierre 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…

    ... thing is to test all voltages, starting with the PSU, the ...
    Pierre Pierre May 2013 Hardware
  • Is This PSU Useable on the Speccy?I just got my Speccy and the PSU has had some 'work' done to it. Somebody has added an extra length of cable on it but rather than soldering or crim…

    ... the regulation of the internal voltages is being done in fact ...
    Pierre Pierre May 2013 Hardware
  • Is This PSU Useable on the Speccy?I just got my Speccy and the PSU has had some 'work' done to it. Somebody has added an extra length of cable on it but rather than soldering or crim…

    ... everyone reports different no-load voltages for their speccy PSU.
    guesser guesser May 2013 Hardware
  • Is This PSU Useable on the Speccy?I just got my Speccy and the PSU has had some 'work' done to it. Somebody has added an extra length of cable on it but rather than soldering or crim…

    ... everyone reports different no-load voltages for their speccy PSU.[/QUOTE ...
    Pierre Pierre May 2013 Hardware
  • Yet another glitchy graphics 48kHeyo, I'm new both to the forums (sorry if this is the wrong forum) and to Spectra I'm afraid, picked up a 48k from a steam fair sale thingy (not th…

    ... to do is check the voltages at various key points, especially ... of call are check the voltages, replace any capacitor that looks ...
    RobeeeJay RobeeeJay May 2013 Hardware
  • Yet another glitchy graphics 48kHeyo, I'm new both to the forums (sorry if this is the wrong forum) and to Spectra I'm afraid, picked up a 48k from a steam fair sale thingy (not th…

    ... remember checking the related capacitor voltages as per the service manual ...
    CaptainHayashi CaptainHayashi May 2013 Hardware
  • Yet another glitchy graphics 48kHeyo, I'm new both to the forums (sorry if this is the wrong forum) and to Spectra I'm afraid, picked up a 48k from a steam fair sale thingy (not th…

    ... using a multimeter to test voltages on a 16K, 48K or ... of the board testing for voltages.

    The main power ...
    1024MAK 1024MAK May 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... [/URL]

    Once the voltages have been found to be ...
    1024MAK 1024MAK May 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... dokey. I shall check the voltages after work as suggested. Hmm ...
    Trafferth Trafferth May 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... Speccy so will measure some voltages tomorrow.

    I don ...
    Trafferth Trafferth May 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... , so I have checked the voltages across the 4116 chips. Within ... +/- 0.02V the voltages are all the same: VBB ... those three rails, so the voltages are within spec.

    Trafferth Trafferth May 2013 Hardware
  • Replacing Axial Caps with Radial CapsMany of the WOS members have complained of how difficult is it to get hold of Axial Capacitors when they want to replace the electrolytic capacitors …

    Funny that you mention it, but I also noticed that lower voltages of the 22uf axial capacitors are being dropped by suppliers.

    /Pedro
    pmsr pmsr 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 …

    ... my next step.

    Voltages seem to be fine to ...
    Simon_Carr Simon_Carr June 2013 Hardware
  • ZX Spectrum 48k Issue 2 Faulty Ram?Hi, I have a faulty ZX Spectrum Issue 2 motherboard. Looks in very tidy condition. Though I'm getting random columns of blocks and flashing cursors…

    ... can be checked by measuring voltages at the lower RAM's ...
    Zorn Zorn June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... the 0.6V region, lower voltages would not 'open' T1 and ... higher voltages would almost immediately force T1 ...
    roko roko June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... +2V. A transistor has treshold voltages like we know from diodes ...
    roko roko June 2013 Hardware
  • Whistling power supplyThe 2A power supply I've been using for my speccies for the last 8yrs or so has in the last few days started giving a high pitched whistle continuous…

    ... and it will send nasty voltages to you Speccy...

    1024MAK 1024MAK June 2013 Hardware
  • Whistling power supplyThe 2A power supply I've been using for my speccies for the last 8yrs or so has in the last few days started giving a high pitched whistle continuous…

    ... and it will send nasty voltages to you Speccy...

    beanz beanz June 2013 Hardware
  • Issue 2 colour problemsHey all, I've got a slight colour problem with my Issue 2 Spectrum, as can be seen below: [IMG]http://www.bennyalford.com/images/issue2a.jpg[/IMG] …

    ... to power up with all voltages good, but not booting. Looks ...
    balford balford June 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... drifts with an RF signal. Voltages and connections for the RAM ... replace the capacitors as well. Voltages from the regulator, etc. all ...
    Trafferth Trafferth June 2013 Hardware
  • The right toolsAs i am going to pick up a hobby of fixing spectrums I wanted to know whats the right tools for the job. Like what wattage should the soldering iron …

    ... especially if you are measuring voltages which have waveforms present. I ...
    Pierre Pierre July 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…

    ... the 7805, add two 3A rectifier diodes into the supply line ...
    DEATH DEATH July 2013 Hardware
  • What models are repairable these days?I've followed a few threads which are trying to repair the mainboard components of the older 48K models, but it got me wondering - is it possible to …

    ... don't like you sticking voltages on input lines, but that ...
    guesser guesser July 2013 Hardware
  • +3 Membrane Scheme??I've been looking and only find the scheme Sinclair models, and would need to find the +3 keyboard scheme. Does anyone have it? Thanks

    ... causing this. I suspect the voltages used gets lost on those ...
    DEATH DEATH July 2013 Hardware
  • What models are repairable these days?I've followed a few threads which are trying to repair the mainboard components of the older 48K models, but it got me wondering - is it possible to …

    ... don't like you sticking voltages on input lines, but that ...
    DEATH DEATH July 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... .

    Get some 3A rectifier diodes, open up the case ...
    DEATH DEATH July 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... suggested to start measuring the voltages and current drawn by the ...
    Pierre Pierre July 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... used in a diode bridge rectifier circuit.

    C = I ... .co.za/wos/cap discharge rectifier.gif[/IMG]

    When ...
    Pierre Pierre July 2013 Hardware
<1…21222324252627…34>

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