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Search Again :: Adv Search 1000 results in 0.010s
<1234567…34>
  • 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 …

    ... RAM seems to be missing it's -5V, the +12V, +5V are ok
    OttO OttO November 2013 Hardware
  • zx spectrum +2A power supply missing -12v voltshey.. i'm looing at a zx spectrum +2A power supply that the -12v rail seems to be missing .. it has the 12 volts and 5 volts .. it is the version wit…

    ... supply that the -12v rail seems to be missing .. it has the ... ok, i have changed the -12v regulator (79L12) no change then ... to the 5 volt and -12v rail ,,, confused.com
    i ... realize that the -12v is not strictly required for ...
    mark8bit mark8bit November 2020 Hardware
  • 48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…

    ... supplies, each chip needs 12V, 5V and -5V and if the power ... of the 74LS157s were missing and the 4164 DRAMs ... when the chip was missing. Pulling what I thought ... or 00001001, two bits missing per byte, so my ... suspect chip was was missing its connection to the ...
    Womble Womble August 2010 Hardware
  • Diagnosing Spectrum 48k (faulty RAM chip?)I have a Spectrum 48k (I believe it may be an upgraded 16k model) that doesn't work, and never has ever since the owner gave it to me. When you turn …

    ... +12v, +5v and -5v available on all the 4116 RAM chips. If -5v is missing ... 's vitally important that the -5v supply is always present when ... (the data sheet recommends that -5v is powered up before the ...
    Winston Winston November 2009 Hardware
  • Hi everybody! Need help trying to rescue a ZX 48K...Hi, since this is my first post, a bit of info about me: I'm an Italian guy, now living in Poland (Warsaw), informatics and electronic geek since…

    ... long as all supply voltages (+5V, +12V, -5V) are OK, there is nothing ... block, and if the -5V has been missing there is a GREAT ...
    Pilsener Pilsener March 2011 Hardware
  • Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…

    ... checking/replacing 7805, check +12V and -5V and replace TR4 if needed ... 4116 with a 5v supply but missing the -5v and +12v tends to very ...
    Winston Winston October 2011 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…

    ... instead of -5V
    +8.5v instead of +12V
    +5V is ok.
    5v supply to lower ram is missing? :-o
    guesser guesser April 2012 Hardware
  • Adding IDE to your Spectrum +2 A/B (or +3)Hello my fellow [B]WoS'ers[/B] [B]This is a shared thread with [url]www.amibay.com[/url] which you can [URL="http://www.amibay.com/showthread.php?t=…

    ... a PSU as that was missing. Is there a way of ... power supplies available with just 12v, 5v, and ground, designed for powering ... you don't have a -12v supply for the serial port ...
    guesser guesser January 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 …

    ... RAM seems to be missing it's -5V, the +12V, +5V are ok
    Falco-F8L Falco-F8L November 2013 Hardware
  • No colors on screen, issue 2.I have a 48k issue 2 with composite mod. When i first pluged it in after i bought it, the screen went yellow and after restart there were no colors a…

    Check your power supply voltages on IC13, pin1 = -5v. pin 8 = 12v. A missing 12v rail would cause a B/W display, as well as being none too healthy for your lower RAM.

    B
    balford balford November 2015 Hardware
  • Problem with the plan of wiring of PSU ZX+3I found on the site the plan of wiring of the Power Supply of the ZX Spectrum+3, but I don't have the correspondence of the pins of card DIN with the…

    ... card DIN with the tensions 12V, 5V and -12V, I am afraid to ...
    Stephane Stephane November 2006 Hardware
  • PC power source and Spectrums.I'm planning to use a basic PC ATX power source (300W) for all my sinclair equipment, but I have two questions: - I've read about some nasty things …

    ... fuses would you use in +12v, +5v and -12v in a +2A and ... a PC power source? Using +12v and relying on the 7805 ... it will overheat FAST), using +5v and bypass the 7805 or ...
    Zup Zup September 2007 Hardware
  • ZX Spectrum 48K, issue - works fine till it gets hot (?)ZX Spectrum 48K, issue 2, works just fine, tested with Winston's diag board. At a certain moment in time however, it seems to run hot and stalls. Whe…

    ... on the lower memory chips (+5V, +12V, -5V).

    Which component might ...
    georgedb georgedb January 2011 Hardware
  • Wanted: Spectrum +2A/3 Power Supply (Working/Broken)Hello there my Fellow ZX'ers I am in need of your help and this time its in the form of a Spectrum +2A or +3 power-supply. Here's a +3 variant, the…

    ... the PSU is an external +12v / +5v Switching Power supply, not like ...
    Zetr0 Zetr0 March 2011 Wanted
  • +2/+3 replacement power supplyI'm getting a black keyboarded +2, it has no power supply so I'm trying to source a possible equivalent if i cant get a genuine one, I know an atx s…

    ... awesome but you need a 12v 10-15amp supply for that ... i don't think the -12v line is man enough 0 ... /quad-output-power-supply-60W-5V-12V-5V-12V-suply-Q-60B-ac-dc ... /quad-output-power-supply-60W-5V-12V-5V-12V-suply-Q-60B-ac-dc ...
    povvercrazy povvercrazy April 2017 Hardware
  • 48k issue 4B display problem etchi,, i have a zx spectrum 48k issue 4B with a display issue it has wavy lines in both the border and paper,some colours seem worse than others ie red…

    ... error..checked resistors etc _5v,12v,5v all present ... anybody have any ...
    mark8bit mark8bit June 2020 Hardware
  • Can somebody help me with this?One of my "friends" shoved a piece of metal into the back of my spectrum (48k RAM) and now whenever I try to use it theres nothing but weird lines an…

    ... the first 16K RAM bank (+12V & -5V).
    If this is ...
    secarica secarica December 2002 Sinclair Miscellaneous
  • Powering a SpectrumNow I've got my DivIDE up and running (and it's totally brillant, I encourage [B]everyone[/B] to get one), can I use the power supply from an old PC …

    ... that generates various internal voltages (+12V, -5V, etc.) So unfortunately you can ... 't just supply 5V bypassing the internal regulator.
    12V line from the PC PSU ... Speccy. That will drop the 12V to around 8-10V.
    Laser Laser September 2005 Sinclair Miscellaneous
  • AMSTRAD monitor for SPECTRUM+3I have a monitor color Amstrad CTM644, can it function on a ZX Spectrum+3? So yes which is the connection? Sorry but I don't have the plans of the co…

    ... card DIN with the tensions 12V, 5V and -12V, I am afraid to ...
    Stephane Stephane November 2006 Hardware
  • Problem with the plan of wiring of PSU ZX+3I found on the site the plan of wiring of the Power Supply of the ZX Spectrum+3, but I don't have the correspondence of the pins of card DIN with the…

    ... card DIN with the tensions 12V, 5V and -12V, I am afraid to ...
    Jmk Jmk November 2006 Hardware
  • Best replacement for ZTX650?What is the best replacement transistor for the obsolete ZTX650? I've read that TIP31 will do the trick. Is there a decent equivalent from the BC or …

    ... that way and kill the +12v/-5v supply). Although my bet is ...
    Winston Winston January 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... some of the 'weird' voltages (+12v) is a switch mode power ...
    Winston Winston March 2007 Hardware
  • +3 external floppyI'd like to connect 3,5" PC floppy drive (NEC) to ZX Spectrum +3 (with diode for RDY). Here are questions: 1) It seems the PC floppy uses just +5V, …

    ... drives that provide +12 and +5V.
    can I buy one ... .com/FOR-HARD-DISK-DRIVE-12V-5V-AC-Adapter-Power-Supply_W0QQitemZ150105244800QQcategoryZ64471QQrdZ1QQcmdZViewItem[/url ...
    orange orange March 2007 Hardware
  • +3 external floppyI'd like to connect 3,5" PC floppy drive (NEC) to ZX Spectrum +3 (with diode for RDY). Here are questions: 1) It seems the PC floppy uses just +5V, …

    ... drives that provide +12 and +5V.
    can I buy one ... .com/FOR-HARD-DISK-DRIVE-12V-5V-AC-Adapter-Power-Supply_W0QQitemZ150105244800QQcategoryZ64471QQrdZ1QQcmdZViewItem[/URL ...
    guesser guesser March 2007 Hardware
  • 48K Speccy not workingHey, A few months ago (hope it&#180;s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…

    ... the voltages, since checking the +12v/-5v/+5v supply at the 4116 RAM ...
    Winston Winston May 2007 Hardware
  • Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…

    ... me:
    check the +5v/+12v/-5v supplies to the 4116 memory ... , and check the +5v supply elsewhere. It's not ... changes by something less than 5v) - but you'll ... will be damaged if +5v is supplied in the absence ... of the -5v line, which is likely ...
    Winston Winston May 2007 Hardware
  • Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…

    ... me:
    check the +5v/+12v/-5v supplies to the 4116 memory ... , and check the +5v supply elsewhere. It's not ... changes by something less than 5v) - but you'll ... ). I see only 2.5V swing there. Ohmmeter shows ... will be damaged if +5v is supplied in the absence ...
    Avian Avian May 2007 Hardware
  • ZX Spectrum Power Cable on +2AHi, Today I bought a +2A, but it is lacking a power cable. I rooted around and found one, but it is for an ordinary ZX Spectrum. Will it work? This…

    ... the relevant voltages (is it 12V 5V and -5V, I've forgotten, it ...
    guesser guesser September 2007 Hardware
  • I want to build a new, super spectrum ;-)only kidding Andrew :-) my brain's going at a mile a minute at the moment, so I thought I should put some of the ideas down in case one of them is w…

    ... datasheet says that the +12v/-5v supplies should be turned on ... and turned off after the 5v supply or internal biasing ... exactly what happens, since the +12v/-5v supply ceases).

    ... you can get "simple switchers", 5v switch mode power supply ICs ...
    Winston Winston September 2007 Hardware
  • Spectrum 48K input voltageI have a power supply that is rated 9,5 Volts DC. With no load it outputs about 9,86 Volts. Is it safe to use it for ZX Spectrum 48K? (it can do …

    ... /> The original PSU output 13.5V unloaded. This dropped to 9V ... needs 9V to generate the 12V and -5V supplies for the DRAM ... by underpowering them on the +12V/-5V lines. So if you do ...
    Phu Phu May 2008 Hardware
<1234567…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
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    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
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    rich_chandler on April 21
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    mel the bell on April 21
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    harriusherbartio on April 21
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  • +3 Disk drive motor
    AndyC on April 21
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    mel the bell on April 20

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missing 10.6K 11.9K
12v 1.9K 3.2K
5v 3K 4.9K

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  • zx spectrum +2A power supply missing -12v voltshey.. i'm looing at a zx spectrum +2A power supply that the -12v rail seems to be missing .. it has the 12 volts and 5 volts .. it is the version wit…
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