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Search Again :: Adv Search 1000 results in 0.002s
<1…16171819202122…34>
  • 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…

    It can be Z80 fault due to connecting external interfaces.
    Try to measure all voltages. In such cases multiple faults may exist.
    kpuchatek kpuchatek February 2012 Hardware
  • Broken +2 (Grey), need helpHello, I got a broken +2, and as I have tons of them working, I want to repair it without fear :D When I power up the machine the I see a horizontal…

    Check all the voltages are right.
    LCD LCD February 2012 Hardware
  • Broken +2 (Grey), need helpHello, I got a broken +2, and as I have tons of them working, I want to repair it without fear :D When I power up the machine the I see a horizontal…

    Hello
    [QUOTE=LCD;601221]Check all the voltages are right.[/QUOTE]

    I have the same feeling. What power supply are you using?Do you have another one?

    Bye

    Jos? Leandro
    Jose_Leandro Jose_Leandro February 2012 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…

    ... being sure the power supply voltages are all correct, any working ...
    Zorn Zorn February 2012 Hardware
  • Just bought a +3 and i think it's broken :(Please help... my spectrum +3 arrived today and I plugged it in, the red light came on and the disk drive made a little noise. So I then set the T…

    ... by checking all the expected voltages are present where they are ...
    Zorn Zorn February 2012 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…

    Those voltages are all correct, so the converter circuit must be working. That doesn't mean all the 4116 ICs are though.
    Zorn Zorn February 2012 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…

    [QUOTE=Zorn;602134]Those voltages are all correct, so the converter circuit must be working. That doesn't mean all the 4116 ICs are though.[/QUOTE]

    I have bought 8 4116 ICs so will replace them when they arrive and go from there.
    kamilb1998 kamilb1998 February 2012 Hardware
  • Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …

    ... to need some measurements of voltages and signals inside to diagnose ...
    Zorn Zorn February 2012 Hardware
  • Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …

    ... it up, is to check voltages. Easiest place is on pins ... don't proceed before those voltages are back in place! These ... are very sensitive to missing voltages. When -5 and/or +12 ... dying too.

    With voltages OK, I check the ULA ...
    RetroTechie RetroTechie February 2012 Hardware
  • Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …

    ... it up, is to check voltages. Easiest place is on pins ... don't proceed before those voltages are back in place! These ... are very sensitive to missing voltages. When -5 and/or +12 ... dying too.

    With voltages OK, I check the ULA ...
    dynaflux dynaflux February 2012 Hardware
  • Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …

    ... too lazy for that ;-) ). Btw: voltages OK? Upper 32K removed?
    RetroTechie RetroTechie February 2012 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…

    ... doesn't work, and the voltages measured on the 4116s are ...
    Zup Zup February 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... have sufficiently low gate threshold voltages to work, and many types ...
    Winston Winston March 2012 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…

    ... because it looked suspect. Wrong voltages came from missing 5V, at ...
    Asure Asure March 2012 Hardware
  • Faulty +2 advice please :)Hi all , I have a faulty +2 which when powered up gives a black border and 6 black and White stripes , I'm thinking faulty ram ??? Any one have any b…

    I've seen this effect a few times, when the power plug socket was loose or not fully connected/inserted all the way. Does the ram get correct voltages to power up all the way?
    Asure Asure March 2012 Hardware
  • Microdrive units with weak (not dead) ULAs...Hi everybody, I've got a Microdrive unit here. It didn't work. It does now (actually, it was the ribbon had broken and the ground had lost contact, …

    ... what the output waveform and voltages are looking like on the ...
    Winston Winston March 2012 Hardware
  • 48k Speccy chucks a wobblerI've got a problem with my rubber keyed 48k speccy. When it is first switched on everything is fine but after a couple of minutes the picture on scr…

    ... 'd want to monitor these voltages as the Spectrum warms up ...
    Zorn Zorn March 2012 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…

    Hmmmm... I don?t know much about electronics. :)
    I?m only trying to learn fixing thie Speccy.
    Without the TR4, it turns on normally. But the voltages of 4116 are wrong.
    So if a 4116 is faulty, the TR4 can burn?
    Turrican Turrican April 2012 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…

    ... powered without all their supply voltages present. If I were you ...
    Zorn Zorn April 2012 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…

    ... smoke anymore. :)
    But my voltages on IC6 are yet wrong ... and C44) and measure the voltages... argh! :cry:

    PS ...
    Turrican Turrican April 2012 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…

    ... smoke anymore. :)
    But my voltages on IC6 are yet wrong ...
    guesser guesser April 2012 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…

    ... don't know where my voltages are becoming wrong... :(
    Maybe ... points can I measure the voltages to know where they are ... 4116 until I fix the voltages.

    Thanks ...
    Turrican Turrican April 2012 Hardware
  • Does a spectrum +2 power supply work on a +3?tiny question, does a spectrum +2 power supply work for a +3?

    ... supply has all the same voltages on the same pins as ...
    guesser guesser April 2012 Hardware
  • No colour after changing LM1889NI replaced the faulty LM1889N in my issue 2 spectrum, since I had a very yellow picture, and soldered a socket to put the new LM1889N into, however, …

    ... . And the VR1 and VR2 voltages was at their correct levels ...
    Johan1973 Johan1973 April 2012 Hardware
  • Does a spectrum +2 power supply work on a +3?tiny question, does a spectrum +2 power supply work for a +3?

    ... ?[/QUOTE]

    No. The voltages are the same, the worst ...
    guesser guesser April 2012 Hardware
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... numbers in brackets after the voltages.

    If the -5V ... .

    If all the voltages are present, then your Spectrum ...
    Zorn Zorn May 2012 Hardware
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... powered without all their supply voltages the more likely they are ...
    Zorn Zorn May 2012 Hardware
  • Dark Screen, non working 48k Spectrum (rubber key)I have an issue 1 (I think) "dead cockroach" 48k Spectrum. On power up I get a dark screen and the machine is unusable - see pics. Any ideas on the…

    ... fault. Are all the supply voltages present at the 4116 ICs ...
    Zorn Zorn May 2012 Hardware
  • Occasional noise over RGB on +2AHi all I have a +2A that is misbehaving at the moment. I'm using the RGB to SCART lead (which incedentally is great on my +3) The problem is, the …

    I havent opened my +2s but making an RGB cable today I was finding the voltages were most certainly not what the various docs claimed they should be. Leading me to think +2s are just wrong(tm).
    XorA XorA May 2012 Hardware
  • 48k PSU UpgradeCan anyone give the definitive word on a PSU upgrade (rather than just a replacement) for 48k machines? I'm thinking of adding at least an IDE inter…

    ... , he could get the additonal voltages. It is good for up ...
    Johan1973 Johan1973 May 2012 Hardware
<1…16171819202122…34>

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