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<1…18192021222324…34>
  • Possible dodgy +2 - resets when loadingSo I have a grey model +2 with a recently refurbed tape deck (new belts and cleaned heads). It might be a product of bad loading, but from what I ca…

    ... playing, or resets to 48k mode in the middle of ... or something related to the power supply on the +2 board. ... some games load fine in 48k mode but reset when ... worked fine on a 48k but on a 128k ... by garbage. :)

    48K mode disables 128K RAM paging ...
    RobeeeJay RobeeeJay August 2013 Hardware
  • Introduce yourself[SIZE=3][FONT=Comic Sans MS]This is the thread to stop by & introduce yourself.[/FONT][/SIZE]

    ... hundred tapes, a 48k (unfortunately without the power supply so I don't ...
    PowerSlave PowerSlave September 2013 Chit chat
  • 48k+ Power Supply quickieGuys, Can someone tell me if I can safely use the power supply of the 48k+ in a 48k? My guess is yes, but I don't want to do something I will regre…

    ... the grey +2 on a 48K Spectrum.[/QUOTE]

    That ... struggling to find a damn power supply in portuguese online sales sites ...
    PowerSlave PowerSlave September 2013 Hardware
  • 48k+ Power Supply quickieGuys, Can someone tell me if I can safely use the power supply of the 48k+ in a 48k? My guess is yes, but I don't want to do something I will regre…

    ... 'm trying to buy a power supply, but here in Portugal is ... . Don't remember seeing a 48K psu being sold alone on ...
    pmsr pmsr September 2013 Hardware
  • one hour lostFound a good deal online here in Portugal, a 48k still in the box, all cables and power supply, tape recorder, and some original games. I told the g…

    ... Portugal, a 48k still in the box, all cables and power supply, tape ...
    fog fog September 2013 Chit chat
  • Your latest retrogaming purchaseAs there is another thread about gaming purchases, It would be nice to know your latest retrogame adquired, preferably Spectrum, but of course other …

    Just bought a 48k issue 6A, a TC2048 and ... +2 Grey.

    The 48k has the membrane destroyed, so ... 't have a power supply. Does anyone knows if the 48k one works ... I have a power supply, tested it on my old 48k that has ...
    PowerSlave PowerSlave September 2013 Games
  • IF1bis StabilityI just thought I would start a different thread relating to the IF1bis, and leave the copyrighters to it elsewhere...:-P I've had mine for a few mon…

    ... on the 5V line at power-up
    2. Bad edge ... 48k, fitted with fresh capacitors and supplied from a standard Sinclair power ... , by repeatedly switching the power on/off, both on the ... the AC side of the power supply.

    If nevertheless, depending ...
    Dan Antohi Dan Antohi September 2013 Hardware
  • +3 on GT65I got the green Amstrad monitor GT65 and I was wondering , it can be connected to the spectrum +3, completely (power supply and video)? I saw that th…

    ... to the spectrum +3, completely (power supply and video)?
    I saw ... whether its possible to use power supply from monitor, too.
    As ... use 5V for computer and 12V for the disc drive.
    guesser guesser September 2013 Hardware
  • Another broken SpeccyHi all I have been given another ZX Spectrum, this time it has a really odd problem as you can see in the video: [URL="http://youtu.be/ZOSiBEYQD7w"…

    ... getting -5v on pin one, 12v on pin 8 and +5v ... an internal power supply uses this to derive the +5v, -5v and 12v.
    ramsrc ramsrc September 2013 Hardware
  • Another broken SpeccyHi all I have been given another ZX Spectrum, this time it has a really odd problem as you can see in the video: [URL="http://youtu.be/ZOSiBEYQD7w"…

    ... Spectrum's internal switch mode power supply system is broken.
    First ... , do not power your Spectrum for more than ... be damaged if the -5V supply is missing.
    Second, are ... issue PCB?

    On 48K and plus boards, TR4 (on ...
    1024MAK 1024MAK September 2013 Hardware
  • Defective +2 grey with only random coloured screen while powering onHi, so the story goes: After buying myself an divIDE and a grey +2, this runs well for a few days. But while playing a game the picture stucks and …

    ... 48K machine I'd advise you to check out the little power supply ... would start checking out the power supply area of the PCB though ...
    DEATH DEATH September 2013 Hardware
  • First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…

    ... electrolytic capacitor in the mains power supply unit...

    Normally there ... (TR4) that provides the internal +12V and -5V has to work ...
    1024MAK 1024MAK October 2013 Hardware
  • Toastrack trouble[IMG]http://i44.tinypic.com/11lq7id.jpg[/IMG] Sorry about the picture size, cant figure out how to make it smaller! Anyway, the pic says it all, th…

    ... both).

    Internal Power supply - Check for +12V across C44

    Check for +12V on pin 11 on the ...
    1024MAK 1024MAK October 2013 Hardware
  • Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…

    ... 16kb lower RAM -5v and 12v must be applied before or ... world.
    The main power supply feed is the +12V.

    So ... if the +5V and / or +12V supplies are lost, as long ...
    1024MAK 1024MAK October 2013 Hardware
  • First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…

    [QUOTE=balford;731550]The low +12v rail voltage is a worry ...

    Ill check the power supply, centre negative. I also have ... a plus 2 power pack same connector type, could ...
    Edge Edge October 2013 Hardware
  • One more grey +2 with video problemsI guess I need your help again to hopefully be able to do some proper troubleshooting myself one day. Here I have a grey +2, which could be a bottom…

    ... as shown in Zorn?s 48K video. The outer positions both ... a short circuit on the +12V and -12V power rails.

    By ... [/URL]), there?s only the 48K and the +3. Wouldn?t ...
    schombi schombi October 2013 Hardware
  • Some problems with 2 ZX Specturm board'sHi, last week i got some ZX Spectrum stuff. Also 2 ZX Spectrum 48K's, one in the orginal case the anoter one in a DK'tronixs case. Both have problem'…

    ... . -5v on pin 1, +12v on pin 8 and +5v ... an overload on the ZX power supply that brings all voltages ... )

    2) The +12V is also way down, much ... the usual 8-9V (9V supply voltage minus 0.7V) ... would check voltage on the power supply jack, and the current ...
    Falco-F8L Falco-F8L November 2013 Hardware
  • Some problems with 2 ZX Specturm board'sHi, last week i got some ZX Spectrum stuff. Also 2 ZX Spectrum 48K's, one in the orginal case the anoter one in a DK'tronixs case. Both have problem'…

    ... Pin 7 is not a power supply pin.
    Do you ... 1, then the internal power circuitry in the Spectrum ... />
    Check the power lead, plug and the Spectrum ... 's power socket (including looking for ... should be between +10V and +12V.

    [I ...
    1024MAK 1024MAK November 2013 Hardware
  • Spectrum Missing -5vMy Spectrum is "almost" booting, just when you expect the (C) 1982 Sinclair Research to appear it just displays flashing squares on the screen :( I …

    ... a problem with the internal power supply circuitry in the Spectrum. Do ... /> Are you sure that the +12V supply is okay?
    What actual ... /> Is the voltage on the +12V line very similar to that ... you are getting a good +12V, check the voltage across (between ...
    1024MAK 1024MAK November 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... *anything* with *anything* on the power supply lines, actually means that you ... circuit) working and feeding it +12V where it expects zero, could ... the +3 with a different power supply. If it still doesn' ... works, then it's the power supply that got killed, so that ...
    skagon skagon December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... *anything* with *anything* on the power supply lines, actually means that you ... circuit) working and feeding it +12V where it expects zero, could ... some chips.[/QUOTE]
    12v with respect to what, and ... produce enough power to do that by shorting the 12v rail ...
    guesser guesser December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... project powered by a 12V, 12A lead acid ... about the -12V? Possibly they tapped the -12V somewhere on ... 5V @ 2A
    +12V @ 0.7A
    -12V @ 0.05A
    < ... +12V: W2=12V*.7A, W2=8.4W
    For -12V: W3=12V*.05A ... PC ATX, etc.. Power Supply if you have one ...
    thomas3120 thomas3120 December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... produce enough power to do that by shorting the 12v rail out ... even know what kind of power supply Spiv was using. He never ... the Vcc line, 12V from the same power supply that provides the 5V ... , is still 12V.
    ...
    skagon skagon December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... computer's ground plane to +12V, even momentarily the ground plane ... the design of the +3 power supply and +3 PCB. It's ... whole thing by shorting the +12v/GND lines, given that you ... the impedance to +12v with the design of that power supply (and any ...
    Winston Winston December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... zero potential. The power supply voltages of +5 and +12V will be +5 ... and +12V ABOVE whatever the ... shorted your DMM probe from +12V to somewhere other than ground ... off.

    Test that power supply under load, test the Z80 ...
    DEATH DEATH December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... zero potential. The power supply voltages of +5 and +12V will be +5 ... high current spike at the supply pins of the chip. ... of the decoupling capacitor to supply enough current (remember the ... measured at the power supply by shorting it to +12v, I will cook ...
    Winston Winston December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... probably" shorted the ground and +12V lines
    Fact b: ... shorting GND and +12V, other than the power supply
    Fact c ... said he tried a different power supply

    Question: explain ... murder that shorting GND and +12V cannot harm anything.
    ...
    skagon skagon December 2013 Hardware
  • Spectrum +2A PSUI picked up a black +2A without a power supply. Looking on eBay the PSUs seem quite rare. The schematics for the PSU show +/-12 and 5v, would it be …

    ... br /> You only need -12V if you are using the ... supply needs to be from a regulated PSU, the +12V is ... other SMPSU's (switch mode power supply units).

    ... PC PSU's can supply a lot of current, ... them to output the main supply voltages.

    [ ...
    1024MAK 1024MAK December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... from shorting GND and +12V, other than the power supply
    Fact c ... said he tried a different power supply

    Question: explain how ... shorting 12v to GND blowing anything (except perhaps components within the power supply ...
    Winston Winston December 2013 Hardware
  • Spectrum +2A PSUI picked up a black +2A without a power supply. Looking on eBay the PSUs seem quite rare. The schematics for the PSU show +/-12 and 5v, would it be …

    ... permanently grounded. All modern ATX power supplies are still on, even ... grounded and they're providing power through the +5VSB line permanently ... course, an old-style AT power supply would be even better.
    power on the 12V line(s).
    skagon skagon December 2013 Hardware
<1…18192021222324…34>

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