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Dodgey R62 / D16 on Issue 2?Hello all, I am still beavering away trying to work out why my Issue 2 fails and after a much closer visual inspection I noticed what looks like som…
... the current from 9v to 12v, however when I performed resistance ... -
ZX Spectrum +2 (grey case) voltage converter circuit oddity.I'm working on repairing one of these and have encountered a possible problem and I'm not sure what I can best do about it, if anything needs to be d…
... />
Good Spectrum: 12V -> 11.3V ... -12V -> -12.4V
Spectrum under repair: 12V -> 11.7V ... -12V -> -13.9V ... only thing that uses the -12V supply). Removing IC3 lowers ... particularly hot. The reduced 12V supply still seems to be ... -
Issue 1 oddityHello to everybody, I have a very first under my hands - a broken Issue 1. Apart from the classic "broken lower RAM" syndrome which will be easily t…
... I can tell.
+12V is operative after the obvious ... -
New Floppy Interface for the +2a/b (black case)Hello everybody! For a long time I wondered about the posibility of adding a FDD to the +2a/b (black). I knew it was possible; All the logic is alre…
... floppy drives that uses the +12v line unless you have a ... -
Joytsick Interface damaged SpectrumHello All, Sob.. I am a plonker, I did the cardinal sin, I was testing a bunch of joystick interfaces that I got off ebay and one didn't have the ke…
... I have lost -5v and +12v. Does this mean the lower ... -
TR4/TR5 replacementHi guys, I've got another Spectrum I'm working on now - an Issue 4S this time. When I originally got it, I powered it up and did the basic tests a…
not working issue 3Hi all, I received this mobo from ebay, after start i have this on screen [img]http://forest.no-ip.org/wos/issue3_01/20150728_135908.jpg[/img] …
... good :) I don't have 12v and don't have and ... after this i get back 12v but not and this time ...another non working issue 3 48kHi all, next! :) I don't have good filings about this speccy :) https://youtu.be/D9qpCR18-kI here is short video what this speccy do. we hav…
... speccy do.
we have 12v and 5v and don't ...48k not startingHi team, I have 2 48k's, one works (Issue 4s), one doesn't (Issue 4a). The non-working one appears to start, but not finish the RAM test. The pape…
... .5V out. -5V, 5V and 12V are all present and within ...No colour - Issue 2 SpectrumThis one is driving me mad - any suggestions appreciated. I have an issue 2 Spectrum with no colour at all. I found the 12v rail was at just over …
... at all. I found the 12v rail was at just over ...Another hardware question - lower 16k bad?Like in my last question, I am referring to this video from JoulesperCoulomb (https://www.youtube.com/watch?v=IzgCmldm2H4), this time, it is with the…
... is with the lower-right (12V) resistance.
The video ...Harlequin Rev. G - error of labels at J16Hi, a German user found an error at Harlequin Rev.G board regarding the labels of J16. The labels of -5V and +12V are interchanged! That could be …
... . The labels of -5V and +12V are interchanged! That could be ...Issue 3B woesHello there, I currently have a Issue 3B for repairs around, it used to have broken upper and lower RAM, which I replaced with 41256-120 DRAMs (hac…
... are at 5.1V & 12V with no ripple (didn't ...Issue 4A, tests complete fine but get odd crashing problemHi all, I've got an issue 4A which has had all of its lower RAM replaced, TR4, TR5 as well as its CPU. It originally had quite high voltages (20-3…
... voltages (20-30v) on its 12v line and some very questionable ...help with broken +2 greyHello, the other day I was trying to record sounds from my grey +2 "sound" socket to an old cassette recorder. Suddenly the screen went to a solid…
... some measuring:
5v/+12v/-12v seem to be ok everywhere ... pin 11 of TEA2000 the +12v are clean, while in pin ... some high frequency over the +12v. I think that's for ...48K Speccy coilsHi folks, For once I don't have an issue, but I HAVE just reanimated two long-dead issue 2 speccies by rewinding their 12V coils after reading a c…
... 2 speccies by rewinding their 12V coils after reading a couple ...Redesigning the ZX Spectrum 128k - A lifelong dreamHello, I am myPinballs (Jim) and i run a small business here in the uk making replacement 8-bit hardware pcbs for arcade pinball games as well as…
... power 5v regulator
• Single 12v supply power in
• Modern ...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…
... about 0 I think and 12v is somewhere around 4v or ...Composite video ghost image on ZX Spectrum 128K +2Hi, I have a ghost image on the composite video out on my ZX Spectrum 128K +2 and have run out of ideas of what could be wrong. Does anybody have a…
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- 10V on the TEA2000 12V input with no obvious ripple ...Upper memory issueZX Spectrum 48K, issue 2, boots fine. Lower RAM OK. When tested with the new test ROM in the Diagboard, for all upper RAM tests "FAIL" is shown. I…
... ]10,7V[/b] (should be 12V, very low)
4116 pin ...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…
... on this line). The +12V / -12V and -5V would have ... for connections between the 12V and the rest of ... is current on the 12V line. Therefore I desoldered ... electrolytic capacitor at the +12V line. I measured 32µ ... electrolytic capacitor on the 12V line was bad. One ...Toastrack - faint monochrome displayHi all, I've got a Toastrack with a video issue on both RGB and RF. I get a faint monochrome screen: on one LCD display it is predominately white,…
... 'm getting about 2V, not 12V, so this is the likely ...Running a Spectrum from a battery...?Here's a bizarre idea that crossed my mind the other day: is it possible to run a Spectrum from a 12V battery? You see, I've got this strange idea…
... run a Spectrum from a 12V battery?
You see ... , seeing as it uses a 12V power supply rather than the ...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…
... was:
Pin B23 -12V
[img]https://lh3.googleusercontent ... [/img]
Pin B22 +12V
[img]https://lh3.googleusercontent ... /> Obviously something is wrong with -12V, but I have no clue ...+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 ... -output-power-supply-60W-5V-12V-5V-12V-suply-Q-60B-ac ... -output-power-supply-60W-5V-12V-5V-12V-suply-Q-60B-ac ...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…
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- pin 8 - should be +12V DC, but was at about ...I can't get my +2B to work over RGB to SCART.Hi so I have a black +2B and no matter what I do I get a black screen using the RGB-SCART scart cable (specific for the model ) and I'm using a SCART…
... scart connector end I read 12v between pin 16 and 18 ...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…
... .7mV, 5V = 4.96V and 12v = .908V. I know that three ...+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…
... PSU voltages first and the +/- 12v is OK but the +5v ...
