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Issue 2 48k Yellow DisplayHi guys. As the title says, I have an issue 2 that's displaying the typical yellow/green colour screen at switch on. The picture is clear and stab…
... the following...
Checked voltages as per Zorns initial startup ... test video. All memory voltages present and correct.
Component ... -
Issue 2 48k Yellow DisplayHi guys. As the title says, I have an issue 2 that's displaying the typical yellow/green colour screen at switch on. The picture is clear and stab…
... the following...
Checked voltages as per Zorns initial startup ... test video. All memory voltages present and correct.
Component ... -
ZX Speccy +2A - B&W & snowy RF output + other issuesHi All, I am new to this forum and I am back to the Spectrum world after 25 years. Recently I've bought a second hand +2A (+2B board - Z70833 Issu…
... on the datacoder PCB. - All voltages are stable and solid.
All voltages are fine in every point ... -
bizarre error on a grey ZX Spectrum+2 - the long search for a small problemHi, I got a ZX Spectrum+2 that worked a bit but crashed while loading or running 128k games. I installed a 128k-test-ROM that told me about RAM fa…
... the transverter generated the additional voltages. Therefore I now shorted the ... -
Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. It was labelled as 'keyboard duff, shows…
... to be okay, and the voltages are all still present, I ... -
A strange issue with a +2 SpectrumHello everyone! I am having a problem with one of my Spectrums, a +2 Grey Case. It has a strange picture on the composite video output, like doub…
... .jpg
I checked the voltages. On RGB analog i have ... -
Are there any differencies between Speccies in different countries?I am asking for differencies of ordinary Speccies, not clones. Can I travel to foreign country, buy Speccy from fleamarket and except it will run at …
... voltage? Different countries have different voltages, thus Speccies have different psus ... -
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…
... oscilloscope an tried to measure voltages on the back connector and ... -
No CLK on issue 2 ULA pin 32I'm trying to fix an issue 2. The symptoms are as follows:- Black and white bars on screen, colours near impossible to tune in, although these po…
... whole board.
All voltages are correct on the board ... -
Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…
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…
... ULA one.
I checked voltages on the RAM and all ...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…
... 're all receiving the correct voltages at least. I've tested ...48k Issue 6a Very sick indeed.Hi Guys. I have a 48k Issue 6a board that shows a white screen with grey border. The white screen has three black squares spaced equally on the le…
... .
My lower RAM voltages are -5V = -029.5mV ( and ... that would give me these voltages I wonder?
I ...+3 PSU fault, can it be repaired?First, i'm no electrical genius/engineer but can solder/de-solder when needed! Powered on my +3 today and the monitor was just flickering/breaking…
... on it! Checked the PSU voltages first and the +/- 12v is ...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…
... black & white bars). 4116 voltages are were present before and ...Character wobbleHello, I have an Issue 2 board which shows vertical character wobble. This happens for a few minutes followed by a few minutes of character sta…
... switching regulator. All power rail voltages are correct. The
board ...ZX Spectrum Issue 4S composite video fuzzy (horizontal blur)Dear people of WoS, Thank you very much for taking the time to read. I have an Issue 4S I recently acquired and planned to fix up as a gift for a…
... observed the IC and transistor voltages closely resemble the ‘working’ ... IC test voltages show on the WOS fault ... Checked comp side connector power voltages (noted discrepancy for 23 12vac ... Checked under side connector power voltages 4.92v (3), 8. ...New colour palette for Spectrum emulators, 16K/48K/+ machinesI’ve made a colour palette for 16K/48K/+ machines, based on the YUV voltage tables in Chris Smith’s book The ZX Spectrum ULA. This colour palette …
... don’t have the YUV voltages in Chris Smith’s book ...Opus Discovery not WorkingHello hope you can help, or if this thread goes well that you also find the answers you are looking for... I have an Opus discovery that does not …
... thread it seemed to infer voltages where important but due inpart ... work out where to measure voltages on the Opus. I can ... measure to check the other voltages.
In that regard ... them until I know the voltages are all correct.
+2 crashes upon pressing some keysYears ago I purchased off ebay a mint condition, Dixons special offer boxed UK-made issue 1 +2. I did not use it so much until recently however, focu…
... 't know how to test voltages etc. myself, but maybe I ...Fixing a poorly Issue 3 - Odd faults.Here's one for you Spectrum fixers, I warn you it's a long one. I've spent a couple hours this evening doing several repairs on a rubber keyed Speccy…
... to the board. Testing for voltages I discovered the 7805 had ... . A basic test for voltages showed all voltages were present and in ...48K Issue 3B slowly fading over 15-20 seconds, capacitor gets hot.Hi folks, Recently my much-modified* RAM testing 48K board failed with a hot/burny smell so I turned it off quickly for looking at later. Thinking…
... mods. I've checked the voltages while it's running and ...zx spectrum 48k low -5volt raili have just received a 48k issue 3. initial tests show that all voltages are there but the -5V rail is only showing -4V. it does boot but i have tur…
... . initial tests show that all voltages are there but the -5V ...zx spectrum 48k interference during first two minutes of warm upi have a issue 3B 48k that i am looking at during the first two minutes (approx.) of warm up there is interference on the screen (tried to take a pic…
... not yet replaced the caps.. voltages are all ok, i stuck ...zx spectrum display corruption .. with lower ram module installed[img]https://photos.app.goo.gl/Gu6rjC5v21sZxwTX9[/img] [img]https://photos.app.goo.gl/FznVw8SkbbhWn5mh7[/img] another specie question : i have …
... different ULA,recap,composite mod, voltages are all present .. in the ...The "Fun" of old equipment...Warning to others with the Alphacom 32.So I manage to slowly rebuild my spectrum, and a part of that is getting a new printer. The Brother printer I once had is no more, and I don't want t…
... , and there's a bridge rectifier with some magic smoke residue ...zx spectrum +2 RGB cable /// pin out/ voltagesi have a +2 cable that seems to be made well from a well known supplier.. it actually came with a +2A i recently brought but most defiantly is not su…
i have a +2 cable that seems to be made well from a well known supplier.. it actually came with a +2A i recently brought but most defiantly is not suitable for +2A it is the version made for 128k / +2 with the bright signal diodes .. I'm just a little ...Building a ZX Spectrum and I have some voltage questionsI've posted about this before looking for parts, but now I've found all the hard-to-get stuff (thank you Retrolium!). So I figured new questions, new…
... I've begun testing the voltages. Figured I'd make sure ... /> So far I think the voltages look good, but I want ... to do with the lower voltages I'm seeing?+2A PSU - power transistor substitute?I used a +2A PSU on a newly acquired Speccy for the first time in quite a while earlier, it was causing apparent issues in that starting the tape dec…
... and tried to measure the voltages in the PSU by direct ...Dead Speccy???I have a 48k+ speccy that boots up with rubbish! is it the z80 cpu? it still has the white boarder but the rest is a mess. any help would be nice..…
... the -5V and +12V, that voltages are very important. They are ... ?t boot correctly. If that voltages are good, the problem is ...
