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Search Again :: Adv Search 753 results in 0.002s
<1…15161718192021…26>
  • 1st interface in 30 yearsHi all, The last time I built a ZX Spectrum interface was 30 years ago, so today I gave it a whirl with an external rom. Switchable in/out of course…

    ... connect a 8.2V zener diode and a 180 ohm resistor ...
    1024MAK 1024MAK 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 …

    ... TR4/5 as the Zener diode may be acting up or ...
    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 …

    ... TR4/5 as the Zener diode may be acting up or ...
    Spekkie Spekkie 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 …

    ... line is the 5v1 zener diode at D19.

    You ...
    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 …

    ... there is a series diode after the Zener diode. This will reduce ... the voltage across the Zener diode first. Sorry, I'm on ... schematics to give you the diode reference number is not very ...
    1024MAK 1024MAK 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 …

    ... the -5V at the Zener Diode as Mark suggested. I have ... -Schematics.gif"]here[/URL] the diode should be D19 (which I ...
    Spekkie Spekkie August 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    After testing TR4 in diode mode I got 6.9V/ ...
    dreamscape dreamscape August 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    Issue two - no ZTX 450 in the output audio - so, test:

    D9, 10 and 13 as well as the caps and resistors mentioned earlier (R36, R37, C32 and C35)
    DEATH DEATH September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    ... audio - so, test:

    D9, 10 and 13 as well ...
    dreamscape dreamscape September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    ... (NOT continuity) across the diode. If you get a ... not the other, the diode is probably okay - if ... a reading both ways, the diode has gone "closed".
    ... br /> If you have a diode test function on your meter ... />
    Remember, a diode will pass current in one ...
    DEATH DEATH September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    ... me and my meter has diode test mode so I've ...
    dreamscape dreamscape September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    The diode (one of them) is that glass component with the yellow bands
    Hold on, am looking out an issue two board
    DEATH DEATH September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    D9 and 10 are the lower of the two diodes - left of the speaker

    Therefore I assume D13 is the one behind the mic socket (IT IS)!
    DEATH DEATH September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    ... of a mess of that diode now the leg snapped and ...
    dreamscape dreamscape September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    ... I will order a new diode and fit it and then ...
    dreamscape dreamscape September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    ... loading signal is too low, diode(s) damaged, a buggered speaker ...
    DEATH DEATH September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    Don't bother ordering a 1p diode ffs, just PM me yer addy, I'll send ya some
    DEATH DEATH September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    Right, then I suspect too low a volume, and a buggered speaker. Switch your meter to the diode test range or a resistance range, and test the speaker - you should get around 30 ohms as a reading, but more important, hear a crackle out of it....
    DEATH DEATH September 2014 Hardware
  • Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…

    ... are my results of the diode tests on tr4 and tr5 ...
    lesoleil70 lesoleil70 September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    ... /> Then replaced the missing D13 diode...

    [IMG]http://s26 ...
    dreamscape dreamscape September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    No, I'm not kidding lololol

    In that pic you've posted, the black band of the diode is facing down - it should face the socket :)

    Trust me, I'm a minor diety xD
    DEATH DEATH September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    ... I've just swapped that diode out and a new one ...
    dreamscape dreamscape September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    ... I've just swapped that diode out and a new one ...
    HZJ HZJ September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    ... know you were missing a diode on the EAR socket. :) It ...
    Spirantho Spirantho September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    ... out it was D9 after all)
    [*]D9 to actually fix the ...
    protek protek September 2014 Hardware
  • Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…

    ... know you were missing a diode on the EAR socket. It ... this before i removed the diode too.

    [QUOTE]Of ...
    dreamscape dreamscape September 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…

    TR4 has likely been destroyed - remove it, but don't fit a replacement yet!

    Does your meter have a diode test?

    [I][B]Mark[/B][/I]
    1024MAK 1024MAK September 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…

    ... capacitor) or D16 (5v1 Zener diode) that have been faulty.
    balford balford September 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…

    ... . Change C46, then the Zener diode at D16 (5v1 Zener) if ...
    balford balford September 2014 Hardware
  • PlusDlite v2014.1 - problems with floppy power supplyI received a small batch of boards of the new PlusDlite design, which is similar to the original PlusD, with GAL etc. The main differences with the o…

    ... Truppel)
    4. Add a diode from /RESET to pin 23 ...
    bverstee bverstee September 2014 Hardware
<1…15161718192021…26>

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