-
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 1 schematics?I'm fault-finding an issue 1 board. So far I've found a hot memory chip and snipped it's supply legs, then swapped the burnt-out 7805 for a switched…
... get a healthy 5V. No coil buzz though, and not sure ... -
Faulty Issue 1Hi all, thought I'd document my efforts in getting another speccy working. I've never done this before so please bear with me... I recently took a p…
... 've not heard the typical coil buzz at any time so ... and I get a noisy coil buzz which changes pitch slightly ... .5V with a slightly quieter coil. Plug the TV in and ... and I can hear the coil buzz change pitch slightly in ... -
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 ... -
Issue 6A power modificationHi all, Just saw this on an issue 6A that I'm working on. Anyone seen anything like it before or even know what it's supposed to be doing? Faulty …
Hi all,
Just saw this on an issue 6A that I'm working on. Anyone seen anything like it before or even know what it's supposed to be doing? Faulty coil maybe?
[img]http://i.imgur.com/ju3x9sT.jpg[/img]
Thanks -
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 ... -
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…
...
- 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 ... -
No VCC on the TEA2000 on a +2 greyI'm trying to fix a +2 grey that has no RF and composite out, RGB is good and the machine works just fine. I thought it would be an easy job... repl…
... but no luck. Replaced the coil and both the transistors again ... -
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…
... power on (continuity, tr4/tr5, coil, power connector) and the socketed ... -
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 ... -
Issue 2 speaker , coil and ModulatorHi, If you have any/all of these parts available I'd like to purcahse them, I'm attempting to resurrect a junk issue 2 board wuth lots of missing it…
Hi,
If you have any/all of these parts available I'd like to purcahse them, I'm attempting to resurrect a junk issue 2 board wuth lots of missing items.
Thanks -
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…
...
- 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 ... -
+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 ... -
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…
... RAM) and also causing the 12V
line to rise to ... -
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…
... messy resistor mod to the coil
I observed the IC ... -
+3 PSU vs +2 PSUI'm referring here to the black +2's :) Now, a closer look shows the differences between the power supplies for these really is: "The 5V line is …
... rated at 2A, the +12V at 700mA (200mA for the ... +2A) and the -12V at 50mA."
... one:[i] Is this 'higher 12V capacity' simply because of the ... not need or require any 12V supply to it. The question ... d need a half decent 12V line if you were ... -
DCP Interpacks - New Old Stock Still Available (Limited)!We rarely see New Old Stock of interfaces for ZX Spectrum appear - Never mind Still being on sale from the 1980's! https://dl.dropboxusercontent.c…
... wire terminals
• 3 x 12V Stepper motor outputs - screw wire ... -
Modifying a speccy to +5v only operation.Just a thought experiment so far. Let's say i wanted to make a more resilient spectrum by getting rid of the DC-DC converter circuit. This would remo…
... would remove the -5v and +12v rails from the speccy. The ... use upper pin 22/23 (12v DC / 12v AC).
I would ... guess i could fit a 12v version as well, and power ... -
Help request for an injured Issue 4A spectrumHi folks, I'm hoping to resurrect an issue 4A spectrum that has been in my hoard for a couple of decades since buying it for spares. Someone ha…
... and -5v are fine, the +12v is low (10.8V)
12v aside from lower ram was ... -
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 ... -
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…
... ok .. i dont suspect the coil as the -12 is correct ...
