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2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…
Hi everybody! Need help trying to rescue a ZX 48K...Hi, since this is my first post, a bit of info about me: I'm an Italian guy, now living in Poland (Warsaw), informatics and electronic geek since…
... that -5V was missing and 12V was bit too low (around ... the -5v line and 12V line is really 12V. Unfortunately nothing changes ...Wanted: Spectrum +2A/3 Power Supply (Working/Broken)Hello there my Fellow ZX'ers I am in need of your help and this time its in the form of a Spectrum +2A or +3 power-supply. Here's a +3 variant, the…
... the PSU is an external +12v / +5v Switching Power supply, not ...now lost the +5v from my +3 psuthe voltages i get from it are -12v +12v +0.61v what part needs replacing in the housebrick that is the PSU? having a bad weekend :-(
the voltages i get from it are
-12v
+12v
+0.61v
what part needs replacing in the housebrick that is the PSU?
having a bad weekend :-(The most awesome Speccy ever!!Let's start with this video: [url]http://www.youtube.com/watch?v=LvWjezDrwdY[/url] Sorry sorry sorry for the hussle in the video, but I really wante…
... modified to be fed with +12V and +5V from the power ...2 blown PSUs in one dayI got a SAM Coupe today, and the PSU started to smoke as soon as I turned it on. Since the Spectrum +3 PSU looked up to powering the SAM, I wired to…
... 5V on the Z80 and 12V on the video encoder chip ... /> I checked the voltages. 12V and -12V were fine, but 5V was ... of the 5V pins to 12V, resulting in a burning smell ...black +2 go awayHi, All what is my problem if i have the proper voltages inside my black Spectrum +2 black (+5v+12v) in all the important IC's , and not have any vi…
... black Spectrum +2 black (+5v+12v) in all the important IC ...Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... on a working model) and +12V at the
right places ...+3 PSU fuseMy +3 burned a 1A250V fuse on PSU and no longer provide +5V (only +12 and -12V works). Now what can cause this? I was not using the disc drive and on…
My +3 burned a 1A250V fuse on PSU and no longer provide +5V (only +12 and -12V works).
Now what can cause this?
I was not using the disc drive and only thing connected was a DivIDE.The rescue of a coil.The problem at hand was a known defect transformer from the switching convertor inside a Spectrum. Both windings are not interrupted and not intercon…
... rewound one takes 3 seconds. 12V measures 11.98, minus 5V ...Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…
... the usually problematic -5V and 12V supply. So what I got ...Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …
... lines and found:
12V - 850 Ohms. Exactly the same ... present, -5V wasn't and 12V was about 8V.
Repaired some 128K's todayI have lot's of ZX Spectrums laying aside with some more complex defects. Today I decided to try to fix some of them. I thought: why not share my ex…
... CPU did nothing although 5V, 12V and the clock signal were ... problem: no 5V and no 12V, allthough the picture seemed fine ...128K heatsink no color in composite video and bad antenna outputI am currently repairing a ZX Spectrum 128K heatsink model. It gives no colors on composite video output, and very bad antenna output. I opened it a…
... connected the 9V to the 12V wiring on the board!!< ... been a failure with the 12V (what other reason could ... the wire I had no 12V.
Replacing the ZTX650 ... did the job; 12V was back.
But ... 9V was shorted with the 12V, but the power levels ...ZX Spectrum not working... issue 4S?Hi, I've bought a "new" broken ZX Spectrum +. The idea was to put an harlequin board inside, but for the moment I'm trying to put it in working order…
48K Issue 3, noisy display.Has anyone here experienced and been able to resolve a problem that looks like this: [URL="http://drizzle.zigg.net/ZX/ZX106-display.jpg"]Photogra…
... oscilloscope to look at the 12V line at the LM1889 and ...old PC with Monocrome Monitor Out.So as discussed in the Carboot sale thread, I have brought and old Apricot Xi. It takes a monochrome monitor via a 9 pin D connector. Now I don't ha…
... />
Pin Description
1 +12v out
2 no connection ... be drawn
from the +12V suipply is 1.0A."
TR4 continues blowing up!The TR4 of my Speccy Issue 3 continues burning even after I changed all electrolytic capacitors and the BA157 diode. If these things serve only to h…
... only to have -5V and +12V, can I remove all 4116 ... , add 4164 and use a +12V power supply instead of a ...48k PSU UpgradeCan anyone give the definitive word on a PSU upgrade (rather than just a replacement) for 48k machines? I'm thinking of adding at least an IDE inter…
... /ATX PSU and regulating the 12v line down to 9v or ... my 7" TFT screen using 12v.
Purchasing a beefy ...4116 replaced with 4164 - ProblemsThanks to Velesoft I have some 4164s, and I have cut the -5V line below R9 where it pass from one side of the PCB to the other. I have cut the +12V a…
... other. I have cut the +12V at C44 where it goes ... back, reattaching the -5V and -12V everything work again. So I ...4116 replaced with 4164 - ProblemsThanks to Velesoft I have some 4164s, and I have cut the -5V line below R9 where it pass from one side of the PCB to the other. I have cut the +12V a…
... other. I have cut the +12V at C44 where it goes ... back, reattaching the -5V and -12V everything work again. So I ...4116 replaced by 4164 - "Noisy" paper?After I replaced my 4116's with 4164's and hooked them up to +5V, disconnected -5V and +12V, I have what looks like vertical lines in the paper, like…
... to +5V, disconnected -5V and +12V, I have what looks like ... I reattach the -5V and +12V and replace the 4164's ...'Jumping' Composite Video Output on +2bNot having much luck recently... I have converted my +2b to composite out using the info contained [URL="http://www.secarica.ro/html/plus3_hardware.…
... 1k resistor in place between +12v and the collector of the ...Issue 4S Schematics and DC-DC circuitA while ago I bought a Spectrum 4S that had problems tuning. I removed the RF tuner as I was not going to use it and did the composite mod. It worked…
... />
I currently have no +12V or -5V from the DC ...Need some advice about electronicsI have wired up an ATX power supply to power my spectrums through a DC-DC converter that gives 9V from the +12V rail. It works well. However, I also …
... that gives 9V from the +12V rail. It works well. However ...Using an ATX power supply - Spectrum 48kOK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :( There is a MOD to use an ATX power supply on the…
... plugged the -5V, +5V and +12V direct from the power supply ...Issue 3 power problemHi all, I have an issue 3 board with an odd power problem, I have no -5V in fact, measuring the voltage on this line leads to a surprising result : …
... circuit must be working as +12V is fine, though comparing to ...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…
... .
Shorted M1 with 12V and the 12V circuit broke.
I ...
