-
+3 No power LED, disc motor continually spinning..and no display. I searched the posts and i found a really old thread going back to 2004 where fuses in the psu were discussed, checked em in this an…
... replaced the fuses anyway, theres no voltage going across them that ... can measure, continuity yes but no voltage. Wish I could find ... etc. you can measure the voltages relative to any of those ... -
+3 No power LED, disc motor continually spinning..and no display. I searched the posts and i found a really old thread going back to 2004 where fuses in the psu were discussed, checked em in this an…
... ![/QUOTE]
There is no -5v from the +3 PSU ... and you can measure the voltages to be sure it's ... -
BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…
... the new ZTX651 and the voltages are
Pin 8 12volts ... getting 0.15 volts so no negative value on that side ... -
Problem with ZX Spectrum (B&W stripes)Hello. I bought a ZX Spectrum, and fortunately, it arrived today. Unfortunately, when I connected it to my TV, this appeared... [IMG]http://i.imgur.…
... suggested, check that there are no loose connections. If any of ... without being able to inspect voltages and signals on the board ... -
Just bought a +3 and i think it's broken :(Please help... my spectrum +3 arrived today and I plugged it in, the red light came on and the disk drive made a little noise. So I then set the T…
... fubar? :([/QUOTE]
1. No. 2. Probably not to the ... by checking all the expected voltages are present where they are ... -
Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …
... to need some measurements of voltages and signals inside to diagnose ... screen) or could you find no signal from it at all ... -
Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …
... Spectrum to a TV (no channel tuning!), and takes ... up, is to check voltages. Easiest place is on ... don't proceed before those voltages are back in place! ... are very sensitive to missing voltages. When -5 and/or ... too.
With voltages OK, I check the ULA ... -
Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …
... block with white border - no cursor prompt, no Sinclair text. Where should ... the Spectrum to a TV (no channel tuning!), and takes RF ... don't proceed before those voltages are back in place! These ... are very sensitive to missing voltages. When -5 and/or +12 ... -
4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…
... need is the two transistors, no resistors are needed. There's ... have sufficiently low gate threshold voltages to work, and many types ... -
Does a spectrum +2 power supply work on a +3?tiny question, does a spectrum +2 power supply work for a +3?
... +3?[/QUOTE]
No. The voltages are the same, the worst ... -
Better Picture QualityToday I built a PSU and RGB-SCART monitor cable for my +3. However, I'm not too happy with the picture quality. It appears that there's like halos a…
... in the TV, there's no way that the speccy is ... you are getting the correct voltages out of the scart cable ... -
48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…
... number of tries. The 3 voltages were OK though.
It ... ROM too.
There is no guarantee that a new Z80 ... -
48K+ losing horizontal syncHello! I've got this 48K plus in perfect cosmetic condition and it works well except for when it gets a tad bit warmer the image rolls around. That w…
... regulator would do indeed... the voltages look correct but it might ... causing ripples... fascinating. I have no oscilloscope to test it but ... -
(Re) building a ZX Spectrum laserharpThe Cambridge show is nearing, and I want to bring my laserharp with me. Why? Because it's built around a ZX Spectrum +2: [IMG]http://benophetintern…
... automatically when there is no movement in the laser.< ... to zero when there is no new load.
This ... get the positive and negative voltages that float around zero, ... to 0V when there is no input change, dispite the ... 0V when there is no change in voltage from ... -
(Re) building a ZX Spectrum laserharpThe Cambridge show is nearing, and I want to bring my laserharp with me. Why? Because it's built around a ZX Spectrum +2: [IMG]http://benophetintern…
... work properly)
- Stable output voltages, fast response, built in protections ... musical elements.
It's no place to finish the laser ... -
Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…
... are okay. [/QUOTE]
Voltages look good compared to another ... isn't reliable, but had no time to do proper testing ... -
Replacing ZTX650 with BD139Today I blew up one of the GALs on one of my DivIDEs while testing on my Toastrack. Shorted M1 with 12V and the 12V circuit broke. I had to replace T…
... it is still holding.
Voltages seem ok with the exception ... it seems to be broken, no forward conduction.
I'll ... -
Over clocking cpu desktop pc.Is it easy? any good online guides? is it worth doing?
... have control over the various voltages in your BIOS?.
Is ... to do simple overclocking with no great danger.
... BIOS of "standard" settings with no overclocking which is the default ... use liquid nitrogen for cooling. No doubt your going to be ... -
48k faultyHi guys! I have a 48k that, currently, presents 2 problems: 1 - Can?t sync to TV correctly. I get a lot of noise and the characters appear to be inc…
... too. When done, check supply voltages (+5, +12 and -5V) at ... that's done AND (all) voltages are within nominal range: report ... out of the equation. (and no tuning the TV anymore, and ... -
What's the correct Spectrum colour palette?Prompted by the recent SCR-to-GIF conversion thread, I was pondering writing one in Z80 assembler. As I did a LZW compression routine a while ago tha…
... ?
Again, I have no clue what I am talking ... />
I'm in the "no correct answer" camp.
This ... fluctuations aside, there is no specific ULA voltages on the you can ... -
My 48K Speccy has died.Hi fellow WoSer's! Wondering if you could help me with my rubber key 48k Spectrum, which died on me this afternoon. It is one I prevoiusly fixed up j…
... at the same time (for no cost) if you like; that ... signal and make all the voltages back to as they were ... -
ZX Spectrum 48K help and Hello :)Hello out there I am a long time admirer of the ZX Spectrum range of computers my first go at one was in the early 1980s with my dads ZX 80 now its …
... 16K of RAM is no longer working. The CPU ... that supplies the odd voltages the 4116 memory needs ...
First check the voltages to the lower 16K RAM ... , if any of these voltages are not present (especially ... />
If the voltages are present, the lower 16K ... -
Want a new old PC.Does anyone know of any good place that sell slightly older desktop PC's very cheap? The motherboard in mine is on its way out. Think there is a cr…
... video with PCIe card removed, no HDD/DVD etc, CMOS erased ... .
I tested the voltages and the current both loaded ... , replaced it, but it made no difference. And the cap I ... -
+2 (Grey) and AT/ATX PSUAny ideas on the best way to power a grey +2 board from an AT or ATX PSU? Looking at the schematic, I could do this one of two ways... 1: Bypass th…
... circuits entirely and inject the voltages through the expansion port. Unlike ... anything besides generating the other voltages so you can forget about ... supply the -12v. There is no pin on the expansion port ... a 12 volt supply with no other modifications, and ... -
Help reviving a 128 +2 GreyHello m8s, my turn to ask for some help with a +2 Grey. Got it for spares as I do have a working one but I could not resist to try and fix it. As us…
... get a screen display with no repeated patterns, the ULA is ... />
Be careful when comparing voltages on the address (A0 to ... the waveforms (and therefore "average" voltages) very much depend on what ... -
48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... bit more etc.... [/QUOTE]
No problem, it is just hard ... in the rectifying stage. And no doubt that more problems can ... a defect 4116. When the voltages are normal the 4116 is ... ease.
Those who see no problem in desoldering a chip ... -
48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
[QUOTE=roko;696530]No problem, it is just hard ... in the rectifying stage. And no doubt that more problems can ... a defect 4116. When the voltages are normal the 4116 is ... ease.
Those who see no problem in desoldering a chip ... -
48k fuzzy screen errorHi all, I just got a ZX Spectrum 48k (rubber keys) from eBay and when I plug it in the main screen on the TV is all fuzzy and garbled in the middle.…
... />
If you have absolutely no practical experience nor very basic ... presence of all the necessary voltages at the lower RAM ICs ... -
48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... everything looks good. There are no bad connections that I can ... to make sure there were no solder splashes.
I ... others haven't? Testing the voltages they are all still good ... -
Is This PSU Useable on the Speccy?I just got my Speccy and the PSU has had some 'work' done to it. Somebody has added an extra length of cable on it but rather than soldering or crim…
... the reason everyone reports different no-load voltages for their speccy PSU.
