-
48k Missing D15Got a 48k here that is missing D15 (just below right molex connector), someone removed it in the past, only just noticed it was gone after replacing …
... check, if this fails try replacing the coil
- Start removing 4116 ... resistance checks pass
- Apply power and test for good voltages ... above TR5 is the 3B power mod executed differently.
'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
... /> [*]8x fried upper ram
[*]Power coil likely broken (no noise)
replacing the coil, TR4 and TR5, to ... see if I can get the power ... assuming this works, look at replacing the RAM and ULA and ...At the Carboot sale today.Today at the carboot sale I picked up An Acorn Electron -I see these all the time, An Official Branded BBC Micro Datacassete Recorder - I'v…
... (which the worst thing was replacing power regulators on the board when ...Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…
... tests on your video, the power coil tests passed mirroring the results ...ZX Spectrum + Revision b Power IssueHi all, I'm trying to repair a ZXSpectrum + revision 3b and at the moment the -5v is missing from the board. I've replaced the TR4 and will be soon…
... will be soon replacing the TR5 and maybe the coil. I was ...Possible design fault in +2A/+3 power pack. Fix?It's the second time a +3 power pack ceases to work when I make a short while using the scope to diagnose a +2A/+3 computer. And it's the second tim…
... the second time a +3 power pack ceases to work when ... results. Only after replacing the 2N2222 the power pack comes to life ... at the schematic for this power pack.
[url]http ...ZX Spectrum 48k issue 3b power problem?Hi :) I was lucky enough to find a couple of ZX Spectrums at a car boot sale yesterday. I spent the evening fiddling about with one (issue 2) and t…
... small buzzing from the coil near where the power lead goes in ... wondering if this is a power issue? Its like it is ... deliberately cutting off its own power.
Thanks in advance ...Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …
The purpose of the coil transformer, from what I gather ...Yet another glitchy graphics 48kHeyo, I'm new both to the forums (sorry if this is the wrong forum) and to Spectra I'm afraid, picked up a 48k from a steam fair sale thingy (not th…
... not working.
The power supply appears to have been ... +2 power supply for it. Now it'll turn on, coil hum ... the motherboard. Since the previous power supply was KO'd that ... I probably want to try replacing the (socketed) ULA, is this ...UPS power supply noise (odd one)I've got an APC Smart-UPS 700 Had it for about three years no problems with it at all. It was 'used' when I got it. Yesterday I powered it down fo…
... left it turned off (no power input) as I did not ... tell if it was a coil whine or a bleep, I ... bit too loud for a coil noise, as I say I ...Spectrum +2 power supply replacementI bought my first Spectrum the other day, a grey +2, but it seems that the power supply is busted (I've tested it with a multimeter and tried replaci…
... with a multimeter and tried replacing the fuse in the plug ... 'd rather get a replacement power supply.
From what ... -fixed-voltage-switched-mode-power-supply-48484"]this power supply[/URL] should ... t understand a lot about power supplies so I wanted to ...Issue 3 ULA ProblemsI've been given an Issue 3 48k to fix. It was producing no video and no picture on the TV. The coil was buzzing so it was getting power and all the v…
... TV. The coil was buzzing so it was getting power and all ... .
Sure enough, after replacing it with a spare ULA ...128K Toastrack - Missing coil?Hiya! I recently acquired a fleabay 128K, and before putting power through it, I thought i'd open it up to see if anything looked obviously wrong (e…
... fleabay 128K, and before putting power through it, I thought i ... it was missing the massive coil that sits in the circle ... have one? Is it the coil I've read about that ...Issue with TV signal + Inductor Coil (16K Issue 2 Speccy)Hello guys, I just got a 16K Issue 2 Speccy from eBay. It was sold as not working so I knew there would be some work needed before it's working ag…
... basic measurements (this time with power on) and the only result ... to be with the inductor coil which gives me +9V on ...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…
... condition: carton, polystyrene insert, power supply. No indication of when ... case (not unexpected). The power supply connector end was poorly ... been using a generic adjustable power supply for now.
... and remove the 4116, replacing them with a socket with ...Finding a good (UK) external switch mode power supply for the basic 48k and 128k ZX SpectrumsThis idea has probably "done the rounds" by now . I think I have heard about it a bit late . This thread with look at replacing the original "heavy l…
... with look at replacing the original "heavy lump" power supply (excluding the ... "black" Spectrums which have different power supply requirements , I believe) with ...Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …
... If no picture, check for power on the modulator. If ... no power present, see "test ... of the board. If power ok, change the modulator. ... . If not, check the coil, ZTX650 AND the ZTX213, ... after all that, try replacing the logic chips 74LS157 ...toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... If no picture, check for power on the modulator. If ... no power present, see "test the ... of the board. If power ok, change the modulator. ... . If not, check the coil, ZTX650 AND the ZTX213, ... after all that, try replacing the logic chips 74LS157 ( ...4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?
... 16K memory bad) and tried replacing it with a static RAM ... the board. A single +5V power supply, and a good look ... circuitry (various transistors, resistors, capacitors, coil etc) could go. Next I ...sinclair zx spectrum issue 6a (again) - how to repairHi All, Is there someone who may explain what these jumpers can be used for. [url]http://forest.no-ip.org/repair/jumpers.gif[/url] <- this is from …
... /> After repairing an issue 3b, replacing just the 7805 and tr4 ... />
Symptoms: No buzz from coil, 7805 reads good voltages but ... to fry just seconds after power on. Replaced tr5 with an ... just seconds after power on. Still no buzz from coil.
sinclair zx spectrum issue 6a (again) - how to repairHi All, Is there someone who may explain what these jumpers can be used for. [url]http://forest.no-ip.org/repair/jumpers.gif[/url] <- this is from …
... memory chip can draw much power and not get immediately hot ... this way then start by replacing them one by one. If ... you'll immediately hear the coil buzzing, if you don't ...Welcomes...and some technical stuffHello I`d like to welcome all ZX Fans. I`m rather ATARI 8bit geek - I got this grat machine when I was 14...20 yeras ago... There were few ZX in …
... ), but are you sure the coil is broken? TR4 is most ... , replacing it solves the problem.
About using a PC power ... aproppiate PCB tracks to the power supply connections.
But ... a much small and cheaper power supply, like the small ones ...Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…
... replacing.
When possible you migh do a test with another Coil ... 128K shares the same power cirquit so the coil must me identical ... /> The electrolytic caps in the power cirquit I can replace, its ... problem is somewhere in the power cirquit?
I ...Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…
... out of spec for the power cirquit to work ok.
power cirquit today (except the two ... ...
If replacing the whole 12V power cirquit (except the coil) doesnt fix ...Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…
... out of spec for the power cirquit to work ok.[/QUOTE ...Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…
... a bad component and after replacing most of them, the very ... and after replacing each and every component of the 12V power cirquit ... without success, finally the deamn coil (that passed ...spectrum48k power supply?Hello, I live in the U.S. and I need to get a power adapter for the spectrum 48k comparable to the original. I needed to know all the specifications…
... I need to get a power adapter for the spectrum 48k ...SPECCY+2 110V POWER SUPPLYI live in the USA and I bought a ZX Spectrum 128k +2 in eBay.com. The problem is that i don't know how to turn it on. All the major US appliances use…
... 110V ac to 9v dc power supply would be enough. I ...Power House Games and Mimzoid Death Dude For some bizarre reason, I'm trying to collect all the Power House games and any games by Grant Jaquest. I particularly want Odd Ball and Mimzoid D…
... trying to collect all the Power House games and any games ...
