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ZX Spectrum 48K, issue - works fine till it gets hot (?)ZX Spectrum 48K, issue 2, works just fine, tested with Winston's diag board. At a certain moment in time however, it seems to run hot and stalls. Whe…
... it's cheap enough to replace all the electrolytic capacitors anyway ... electrolitic capacitors that were under 7805 heatsink !!.
Bye
ZX Spectrum 48K, issue - works fine till it gets hot (?)ZX Spectrum 48K, issue 2, works just fine, tested with Winston's diag board. At a certain moment in time however, it seems to run hot and stalls. Whe…
Interesting... I'll certainly replace the capacitors, that's not ... work. I'll change the 7805 as well when that doesn ... not as hot as the 7805.
Wouldn't it ...Fully integrated ZX+Hi, I just want to show some inspiration for integration HW to ZX+ case ;-) - ZX48 issue 3 board, without all parts regarding video generating (pa…
... to 4164, first plan was replace it with SRAM, but may ... used instead of original one. 7805 just bridged by wire and ...Fuzzy Screen On 48k Spectrum.Hi there. I bought a Spectrum off eBay last week (another for my collection lol), and it suffers with a fuzzy screen e.g. it looks like interference …
... speccy, I replace two things.... replace all caps and the 7805 regulator whether ...Fuzzy Screen On 48k Spectrum.Hi there. I bought a Spectrum off eBay last week (another for my collection lol), and it suffers with a fuzzy screen e.g. it looks like interference …
Voltage regulators like 7805 always need [I]some[/I] ... it should never hurt to replace those capacitors in old systems ...DivIDE+ and the 48k SpeccyI've 3 48k speccies of various revisions and none of them are working with my DivIDE+ yet all my 128's do, yet I'm sure when I first had it I'm sure …
... a discussion about replacing the 7805 with a modern substitute maybe ... I decided to just replace it with another 7805. The consensus seemed ... to be that the 7805 is the tried and tested ...Amperage drastic reduction in a rubber 48KWell, I am now with the approach of a drastic reduction ZXSpectrum amperage. As a first step would change the Z80 processor for other (Z80C). Unfortu…
... of all the memory and replace it with modern low power ... & 26 and changing crappy 7805 by tracopower 2150, I hope ...Amperage drastic reduction in a rubber 48KWell, I am now with the approach of a drastic reduction ZXSpectrum amperage. As a first step would change the Z80 processor for other (Z80C). Unfortu…
... voltages, I would remove the 7805 and plumb in a +12v ... (remove the power circuit & replace memory) the same battery 5v ...Amperage drastic reduction in a rubber 48KWell, I am now with the approach of a drastic reduction ZXSpectrum amperage. As a first step would change the Z80 processor for other (Z80C). Unfortu…
... , and you might try to replace ROM with a *CMOS* EPROM ... as well, However, you can replace the DC-DC converter section ... converter in place of the 7805, you're done. IIRC the ... mA... ;-) ) - that is with the 7805 still in place.
+D problemi picked up another one of these but it seems to have a problem every time i try to format a disk it comes up with the following message after trying…
... 7805 delivers a nice +5v
might try and replace all ...New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
... /> 55%? Okay, the 7805 is a very old technology ... /TheDrakon/composite%20nes%202/7805.gif[/url]
... ".
The 7805 is indeed "old technology" but ... being used widely today. 7805 is a linear regulator, ... one you wish to replace BUT they may not ...Sinclair QL ProblemHi there. I purchased recently four Sinclair QL for a not small amount of money. Two german and two english, they are mixed: British or European conn…
... new Recom DC converters to replace the 7805 (10x 1 Ampere and ...Sinclair QL ProblemHi there. I purchased recently four Sinclair QL for a not small amount of money. Two german and two english, they are mixed: British or European conn…
... new Recom DC converters to replace the 7805 (10x 1 Ampere and ...Sinclair QL ProblemHi there. I purchased recently four Sinclair QL for a not small amount of money. Two german and two english, they are mixed: British or European conn…
Yes, I will replace the 7805 with 1.5A Recom too :) ...128K blues, part +2: picture and tape driveI recently purchased an original (grey) +2 which sadly seems not to be fully working. The computer powers up but there is no way to obtain a stable p…
Try to replace the 7805 power regulator, its very easy to do, its the three legged thing attached on the heatsink. The fact that you cant get a stable rf picture suggests the problem isnt the rgb cable.128K blues, part +2: picture and tape driveI recently purchased an original (grey) +2 which sadly seems not to be fully working. The computer powers up but there is no way to obtain a stable p…
[QUOTE=gtsamour;538038]Try to replace the 7805 power regulator, its very easy ...48k to 128k upgrade - problemsHi friends! I built 128k upgrade according to the [url]http://hw.speccy.cz/128krebuild.html[/url]. After I powered on my Speccy it said hello with s…
... has all new electrolic capatitors, 7805 replaced by DC-DC step ... , replaced CPU (and I will replace it again with CMOS as ... wonder is it worth to replace 48k ROM to 128k one ...Greetings all overheat problemsfirstly hello everybody and thanks for adding me to the forum dont know if ill be much use here but i hope so the problem i have or should i say a…
... /10-x-78S05-5V-Regulator-7805-FREE-POSTAGE-/120765968107?pt=UK_BOI_Electrical_Components_Supplies_ET ... anthing other than the basic 7805 (1A) regulator, which wouldn't ... ...
I decided to replace the Regulator.... since it was ...Dead Spectrum+Hi! Any suggestions where to start finding what's broken: Spectrum+ with issue 6A motherboard and nothing on TV. Top row of the upper memory chips g…
... .
- Check +5V at 7805 output. If not present, isolate ... with the output pin unconnected, replace the 7805.
- With a ... supply, check +12V and -5V. Replace TR4 (ZTX650) if +12V reads ...Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
@absynthe boy
if you are based in the UK, and dont mind a little soldering / de-soldering, then I could send you a 7805 regulator to replace the (most likely) dead one in the machineDead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... could send you a 7805 regulator to replace the (most likely) dead ... longer convinced it is the 7805...I was getting the strange ...Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... checking/replacing 7805, check +12V and -5V and replace TR4 if needed ...Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... ! (at least not before replacing 7805 and/or transistors in +12 ... a lot more work to replace than 7805 or a few transistors ...Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... checking/replacing 7805, check +12V and -5V and replace TR4 if needed ...Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... first step would be to replace the 7805 and TR4 (is it ... a ZTX650 ??). I know 7805's are still readily available ...Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... first step would be to replace the 7805 and TR4 (is it ... a ZTX650 ??). I know 7805's are still readily available ...Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…
... flaky.
[*]Replace all electrolytic capacitors, and/or replace 7805 regulator (perhaps with ... on this forum about old 7805 regulators that [I]appeared[/I ... caps & 7805 cost pennies, and are easy to replace.
[*]Search ...Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... this? I just replaced the 7805 and TR4 last week.[/QUOTE ... />
Did you locate and replace the failed ram that is ...Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…
... easy is it to repair/replace the ribbon?
[/quote]
7805 reg) and also the power ...ZX81 Dark screen, could it be the ULA?Trying to get a ZX81 going for a mate of mine, already replaced the membrane (Cheers Rich!) but now its the old "very dark screen" problem, probably …
... capacitors on them plus the 7805 regulators. Didn't have any ... newer ULA issue (2C210) and replace the one you have (ULA ...
