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  • Speccy PSUI've grabbed a Speccy PSU from fleabay and it looks like a Speccy Plus PSU. After testing it with a multimeter it's kicking out 12V rather than the …

    ... versatile, because of the selectable voltages and several plugs.
    schombi schombi March 2013 Hardware
  • Speccy PSUI've grabbed a Speccy PSU from fleabay and it looks like a Speccy Plus PSU. After testing it with a multimeter it's kicking out 12V rather than the …

    ... (Fluke).

    1. The voltages without load on the power ... measurement

    2. The voltages without load on the power ... measurement.

    3. The voltages with load on the power ...

    4. The voltages with load on the power ...
    Pierre Pierre March 2013 Hardware
  • Spectrum 128k +2 grey RAMhi all, the manual say that ram ic's should be KM4164B-15P but when i open my spectrum (not repaired by anyone) the ram chips was KM4164B-12 is thi…

    ... , has [I]three[/I] supply voltages, +12V on pin 8 and ...
    RetroTechie RetroTechie March 2013 Hardware
  • ZX Spectrum 48K yellow displayI have a ZX Spectrum which displays a yellow- instead of grey screen on startup. All colours seem mixed with yellow. Everything else seems fine, some…

    Thank you for your reply Zorn.

    I'll check the board tomorrow and I will compare the voltages/signals to a board that produces a correct picture.
    If I find any differrences, or solve the mystery, I will post it here.
    Knik Knik March 2013 Hardware
  • Spectrum 128k +2 grey RAMhi all, the manual say that ram ic's should be KM4164B-15P but when i open my spectrum (not repaired by anyone) the ram chips was KM4164B-12 is thi…

    ... , has [I]three[/I] supply voltages, +12V on pin 8 and ...
    xaris_sm xaris_sm March 2013 Hardware
  • Improving Composite Output of 48K SpectrumI've been playing around with this Spectrum 48k I got inside a dK'tronics keyboard, because well I've already got two working other ones so why not..…

    ... input(-impedance). Now different DC voltages charge this capacitor to different ...
    roko roko March 2013 Hardware
  • Thinking of modding an Atari paddle controller for games like Arkanoid...Hello, Was thinking of trying out a controller mod using an Atari 2600 paddle controller to use with games like arkanoid, Batty, etc... The paddle c…

    ... comparator to convert the analog voltages to digital (left and right ...
    Zetr0 Zetr0 April 2013 Hardware
  • Setting up an IDE HDD on the +3e helpHello, Just installed a HDD in my +3e (ROM ver. 1.11). When turning on it takes a few seconds longer but then shows 2 IDE (available) as well as 1 fl…

    ... parallel ATA uses TTL compatible voltages. :???:
    guesser guesser April 2013 Hardware
  • Repair 128k +2 grey part2hi all, i am trying to fix it couple of weeks now, i bought a working one for tests and parts check so until now, power TRs are all news memory IC'…

    Probably you did it, but:
    - use RGB cable for display to have direct ULA signals
    - check all voltages to see if there are any drops
    - double check if you have Z80/ULA, RAM chips working ok
    kpuchatek kpuchatek April 2013 Hardware
  • Repair 128k +2 grey part2hi all, i am trying to fix it couple of weeks now, i bought a working one for tests and parts check so until now, power TRs are all news memory IC'…

    ... ULA signals
    - check all voltages to see if there are ...
    xaris_sm xaris_sm April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... computers of this age, all voltages are measured with respect to ...
    1024MAK 1024MAK April 2013 Hardware
  • Help reviving a 128 +2 GreyHello m8s, my turn to ask for some help with a +2 Grey. Got it for spares as I do have a working one but I could not resist to try and fix it. As us…

    ... />
    Be careful when comparing voltages on the address (A0 to ... the waveforms (and therefore "average" voltages) very much depend on what ...
    1024MAK 1024MAK April 2013 Hardware
  • Black and white composite displayJust pulled out an old CRT display and tried my trusty rubber key on it (comp modded), im using one of those scart adapters for an xbox to accept the…

    ... if you could compare the voltages in the video stages with ...
    roko roko April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... (ZTX 650) and check the voltages again... they should be back ...
    JeffB JeffB April 2013 Hardware
  • +2B datasette issueMate of mine has a +2B, always worked before until today, it seems the azimuth is going out all byu itself and constantly needs re-adjusting (the scr…

    ... the normal connector which has voltages / signal and ground on i ...
    spider spider April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... a defect 4116. When the voltages are normal the 4116 is ...
    roko roko April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... a defect 4116. When the voltages are normal the 4116 is ...
    deadeye deadeye April 2013 Hardware
  • Composite video for 48k Capacitor orientationHello, My multisystem TV is acting up and I'm unable to navigate the menu to tune in the RF signal for my speccys. However the A/V input still works.…

    ... a similar dislike for negative voltages.
    RobeeeJay RobeeeJay April 2013 Hardware
  • Faulty 48K Issue 3 motherboardHi I have a faulty Issue 3 motherboard and would appreciate it if somebody can steer me in the right direction of where to begin with the fault find…

    ... checked [I]all[/I] supply voltages? That is: +5, +12, -5V ...
    RetroTechie RetroTechie April 2013 Hardware
  • Faulty 48K Issue 3 motherboardHi I have a faulty Issue 3 motherboard and would appreciate it if somebody can steer me in the right direction of where to begin with the fault find…

    ... I did check all the voltages and all were fine, but ...
    Pierre Pierre April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... capacitors.

    If these voltages aren't present then you ...
    guesser guesser April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... capacitors I replaced, had different Voltages than the ones replaced. Instead ...
    deadeye deadeye April 2013 Hardware
  • 48k fuzzy screen errorHi all, I just got a ZX Spectrum 48k (rubber keys) from eBay and when I plug it in the main screen on the TV is all fuzzy and garbled in the middle.…

    ... presence of all the necessary voltages at the lower RAM ICs ...
    Zorn Zorn April 2013 Hardware
  • Issue 4S AnnoyanceRecently ive been going through a few interfaces testing them and I stupidly inserted a "key-less" interface (didnt know at the time but should have …

    if all the voltages are present on the lower RAM then I don't see how TR5 can be blown :confused:
    guesser guesser May 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... others haven't? Testing the voltages they are all still good ...
    deadeye deadeye May 2013 Hardware
  • Issue 4S AnnoyanceRecently ive been going through a few interfaces testing them and I stupidly inserted a "key-less" interface (didnt know at the time but should have …

    Pilsner was referring to the the part of the Spectrum circuit that creates the working voltages from the 9v that the power brick provides.... ;)
    JeffB JeffB May 2013 Hardware
  • Issue 4S AnnoyanceRecently ive been going through a few interfaces testing them and I stupidly inserted a "key-less" interface (didnt know at the time but should have …

    ...and I'd suggest replacing TR4 and TR5 and re-checking the voltages
    JeffB JeffB 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…

    ... thought it was!

    Voltages on the lower RAM now ...
    Simon_Carr Simon_Carr May 2013 Hardware
<1…20212223242526…34>

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