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<1…13141516171819…34>
  • Help with Spectrum 128k reparationHi! I have the following symptoms with a 128k unit version 6U - On power on, black and white bars (one char width each), white background - Once po…

    ... /> What else can be faulty? ULA? Z80? And how do I know ...
    kwyjibo kwyjibo November 2015 Hardware
  • Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…

    Most likely either the Z80 CPU is dead, the CPU ... one of the DRAM chips faulty and is dragging down a ... ). All these are on the Z80 CPU pins.

    If ...
    1024MAK 1024MAK December 2015 Hardware
  • Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…

    ... ;844310"]Most likely either the Z80 CPU is dead, the CPU ... one of the DRAM chips faulty and is dragging down a ... the RAM chips or the Z80 dying, what's going on ...
    Mysterion Mysterion December 2015 Hardware
  • Unresponsive Spectrum with Magenta border.This Spectrum is taking an age for me to repair, thank for all the help thus far!  So after I switch on the ZX Spectrum+ I get the familiar white…

    ... . If the ROM or the Z80 was faulty, I would not expect ... the /IORQ line is faulty from the Z80. If it's socketed ...
    1024MAK 1024MAK January 2016 Hardware
  • Unresponsive Spectrum with Magenta border.This Spectrum is taking an age for me to repair, thank for all the help thus far!  So after I switch on the ZX Spectrum+ I get the familiar white…

    I wonder could TR6 be faulty? Remind us, what issue Speccy is it?

    You could try removing TR6 (or the transistor across the Z80 if it's an issue 2) to see if it affects things.

    B
    balford balford January 2016 Hardware
  • Need some help repairing an issue 3 spectrumI am looking for some help repairing an issue 3 speccy, here's what I tried so far. The speccy is not booting up correctly, when using the diagnos…

    ... />
    Something is causing the z80 to act weird, but it ... the lower ram always tests faulty.
    patzik patzik August 2016 Hardware
  • Need some help repairing an issue 3 spectrumI am looking for some help repairing an issue 3 speccy, here's what I tried so far. The speccy is not booting up correctly, when using the diagnos…

    ... the +5V supply to the Z80.

    /NMI, /WAIT, /BUSREQ ... are all inputs to the Z80 CPU. It cannot drive any ... of these out, or the Z80 is faulty (but you have already ...
    1024MAK 1024MAK August 2016 Hardware
  • Spectrum issue 4SI have an almost completely depopulated issue 4s board. Wondering what to do, repairs or spares? I hooked it up and the voltages are off, 5v is fi…

    ... of circuit, and it was faulty. Strangely enough both TR4 and ... of the board, ULA, ROM, Z80, LM1889 and most of the ...
    patzik patzik August 2016 Hardware
  • Magenta border and black screenGot my hands on a issue 3 48k machine. Did the initial resistance checks and everything seemed in order buy when I switch the machine on all I get is…

    ... either the ULA is partly faulty, or there is a fault ... by the ULA (from the Z80 CPU).

    Does this ...
    1024MAK 1024MAK September 2016 Hardware
  • ZX Spectrum 48k issuesHi all! A couple of days ago I bought my first 48k Speccy off ebay (I already own a beautiful QL expanded with QubIDE interface and 640k ram). It was…

    ... more 4116 DRAM chips are faulty. In the Spectrum, all the ... "upper" 32k not fitted, the Z80 stack will also be in ... peak signals, and second, the Z80 clock signal is not a ...
    1024MAK 1024MAK January 2017 Hardware
  • Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…

    ... />
    - The ROM and the Z80 get a bit warm after ... think that the ROM was faulty. The ULA of course is ...
    Mikelone Mikelone April 2017 Hardware
  • 128K Toastrack (Noisy video output)Hello there guys! Need all of yours guides and advices. Some time ago I bought a nice looking 128K from eBay (motherboard v6K) and put it aside for…

    Some Z80 CPUs from Zilog might have a faulty /M1 line. It is well know issue regarding a compatibility with any inference which requires the /M1 active.
    Claudius Claudius April 2017 Hardware
  • 128K Toastrack (Noisy video output)Hello there guys! Need all of yours guides and advices. Some time ago I bought a nice looking 128K from eBay (motherboard v6K) and put it aside for…

    ... ;903998"]Some Z80 CPUs from Zilog might have a faulty /M1 line ... fine on it and the z80 I replaced worked fine on ... issues between different brands of z80.
    gtsamour gtsamour April 2017 Hardware
  • Keeping Your Spectrum Original. This "thread" believes this is best approach to owning Speccies and will cater for all those who like a Museum Approach . How does one keep one…

    ... -ties. So, even a newer Z80 from 1989 or new 21st ... . When the ROM chip is faulty you will go for modern ...
    Claudius Claudius April 2017 Hardware
  • Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…

    ... logic analyzer to monitor the Z80 clock pin (pin 6) and ... button. If either is faulty, the Z80 CPU will not get a ...
    1024MAK 1024MAK April 2017 Hardware
  • Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…

    ... ). The red lead to the Z80 pin 22. Test the /RD ... does point to the Z80 as being faulty.

    There is ...
    1024MAK 1024MAK May 2017 Hardware
  • ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …

    ... one on IC7 has one faulty "sprung connector pin" which prevents ... be ordered:-

    1) Z80 processor
    2) the ZIFs ... ordered ::also 0:Processor .NEC Z80 D70C ordered
    harriusherbartio harriusherbartio May 2017 Hardware
  • Replacing z80Hi all, I've just finished removing my z80 and installing it back in in a socket. Surprisingly I haven't broken anything in the process and the sp…

    ... Z8400AB1 is a 4MHz NMOS Z80 CPU. It should work okay ... a batch of CPUs with faulty /M1 outputs. I strongly suspect ... most of the Z80 CPUs in Spectrums that have faulty /M1 outputs ...
    1024MAK 1024MAK July 2017 Hardware
  • Joystick IssuesHi guys, I'm having a few issues getting joysticks to work well on my Spectrum 128k. I've got a Power Play Joystick interface and I've tried it with…

    ... a dirty edge-connector or faulty interface) to supply the real ... , the value read by the Z80 CPU is whatever the value ...
    1024MAK 1024MAK July 2017 Hardware
  • ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…

    ... the 4116 DRAM chips. Some Z80 CPUs also feel warm in ... the 4116 DRAM may be faulty). If this is the case ...
    1024MAK 1024MAK August 2017 Hardware
  • ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…

    I tried another set of RAMs (4116-2) but no change. I also replaced IC3 and IC4 (I changed everything I found as spare parts to eliminate as many possible causes ).. It looks like the Z80 is faulty
    Trafic Trafic August 2017 Hardware
  • ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…

    It maybe a faulty ULA. However, despite running warm, ... is receiving instructions from the Z80 CPU.

    If the ... that reads the RAM is faulty, the CPU should be still ...
    1024MAK 1024MAK August 2017 Hardware
  • Spectrum repairs[edit - sorry! wrong section, if someone can move please] I'm in contact with a seller on Gumtree. He was selling a 48k Spectrum, fully boxed and…

    ... (could be just a single faulty chip), but it could also ... of the RAM. Or the Z80 CPU could have died. Or ...
    1024MAK 1024MAK August 2017 Hardware
  • Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…

    ... , the Spectrum is actually a faulty 48k working as a 16k ... .z80.info/zip/z80-interrupts.pdf (original) or http://www.z80.info/zip/z80 ... 1 if you want. The Z80 just reads two bytes from ... . INTERRUPTS in http://www.z80.info/zip/z80-documented.pdf

    1024MAK 1024MAK August 2017 Development
  • Replacing lower RAM 4116 ZX Spectrum 48k - desoldering advice please?A long post, but interesting pictures perhaps. :) I'd like some advice: (also apologies I think I picked the wrong 'Hardware' category for this, plea…

    ... trying the ULA from this faulty board in a known working ... grey) every time, then the Z80 CPU is either not able ... ROM, or the ULA is faulty.

    If you get ...
    1024MAK 1024MAK October 2017 Hardware
  • 48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…

    ... creates the video signal). The Z80 CPU is not processing instructions ... are defective."

    The Z80 is a new genuine Zilog ... fine; I desoldered the original Z80 and tested it in the ... , so I assumed this was faulty. I will do some continuity ...
    dozey_dustman dozey_dustman December 2017 Hardware
  • Broken Issue 2 - likely culpritsI've just got hold of an issue 2 spectrum with an interesting layout (heatsink is vertical and goes down to the speaker, some variable resistors and …

    ... . Reflowed the solder on the z80, ROM and all the lower ... ICs until I find a faulty one unless there are any ...
    dave18 dave18 March 2018 Hardware
  • what components normally get taken out if you plug+unplug a joystick interface in with the power onwhat components normally get taken out if you plug+unplug a joystick interface in with the power on? i remember doing this a few times when i had …

    ... why so many Z80 CPUs in ZX Spectrums have faulty /M1 outputs ... reported or discussed in other Z80 based computer forums).

    1024MAK 1024MAK October 2018 Hardware
  • Testing an Interface 1As title, is there an easy way on how can I test to see if its functional or not please ? :) Please bear in mind I do not have *any* microdrives n…

    ... 56329"]I recall a faulty Z80 or ULA can make it ... that faulty M1 pin (pin 27) on the Z80 causes ... prevents reading IF1 ROM. Faulty M1 would not be detected ... well). But you can exclude faulty Z80, since you get the ... M1 on my Spectrum is faulty, since I newer owned ...
    artVan artVan November 2018 Hardware
  • help with issue 3 48k speccy after recap and new tr4 and tr5I have a 48K speccy that was not working. After recapping and replacing TR4 and TR5 it came back to life However after a short while running weird …

    ... has been corrupted - indicative of faulty RAM, and I'd say ... the Z80 data lines are being messed up by a faulty RAM ...
    DEATH DEATH December 2018 Hardware
<1…13141516171819…34>

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