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PC trouble!First my flash disk suffered a spectacular crash and now my PC refuses to boot up. I mean, all I get is the powered on LED light, and the internal fa…
... it will return the various voltages across the various lines. The ... well.
I have no doubt these would pinpoint your ... problem out in no more than a couple of ... -
The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…
... , the 4116 requires THREE supply voltages. They must be supplied in ... .
The Spectrum does no such thing though. It just ... -
Possible Move to USA - Advice please.It is possible that I may be getting a Job on Oregon USA. I wondered what advice the expats of WOS might give me. [LIST] [*]For example is living …
[QUOTE=Scottie_uk;480013]
Oh no my 'nice phone'..... :([/QUOTE]
< ... into a US socket (the voltages etc. are the same for ... since you pulse dial only. No, I'm not making it ... -
Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... the Wikipedia page for RS232 voltages:
[URL]http://en ... people were using electromechanical teleprinters! no tiny little integrated circuits.
ZX Spectrum+ Problem - Need help -Greetings guys, I bought one ZX Spectrum+. This is what displays on the TV: [IMG]http://d.imagehost.org/0371/17102010_001.jpg[/IMG] When I switch …
... is possible that you have no electricity due to a shortcut ... chips better get the internal voltages (-5V, 5V, 12V) checked ...ZX Spectrum+ Problem - Need help -Greetings guys, I bought one ZX Spectrum+. This is what displays on the TV: [IMG]http://d.imagehost.org/0371/17102010_001.jpg[/IMG] When I switch …
Voltages are probably ok, because 5V ... ,INT,CLK) if there is no short to other pin or ...Schematic ErrorThere appears to be an error in the Schematic for the 128k +2A and +3 the error is present in both the redrawn TIF version and the original drawing …
... , thus protecting it from dangerous voltages.
[/QUOTE]
The Gate ... the associated diodes. There is no direct connection between the tape ...48k rubber key screen corruption[IMG][URL=http://img195.imageshack.us/i/img7398g.jpg/][IMG]http://img195.imageshack.us/img195/5563/img7398g.th.jpg[/IMG][/URL] Uploaded with [URL=htt…
... working model and same results, no key clicks either, its not ... the equation. But again: supply voltages first.broken 48K, strange screenwell I finally socketed all lower 16K ram chips, (8 of them in a row near corner, not those 4 in two rows) and replaced them with new ones but it did…
it was TR5 (issue 3B). no need to replace it, two ... board. I soldered them and voltages are fine now. graphics is ... was without a case! (so no surprise it was broken)
Testing memory/transistors etc with multimeterAnyone have a rough guide to show how to do this properly? Im using the diode setting on the multimeter to test various components, im touching the b…
you should test top left pin on RAM chips, too. it should be -5V.
btw, no need to test voltages on each chip (sorry to state the obvious, just to be sure).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…
... , like the tv's getting no signal, but if I connect ... one moment to the other, no signal in the tv when ... at first but all the voltages seem correct; Aprox. 12V Input ...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…
... /> Ok mcleod, I checked the voltages again. From the psu I ... when I plug it. Those voltages you said to check, I ... one I'm getting no signs of life, no noise, though I ...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…
As long as all supply voltages (+5V, +12V, -5V) are OK, ... it from.
There is no other way to check it ...heatsink on the grey+2anyone ever modded one to run without the heatsink? I know some have on the 48k's but I wouldn't mind removing it from one of mine. If so, any tips …
... of voltages is done externally in the power-supply, thus no need ... to regulate voltages internally - thus no need for heat ...ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…
... /> Have you checked that the voltages are correct when the PSU ... +3 is drawing. If the voltages are down this may indicate ... the 5v supply, the other voltages are only needed by non ... running even though there is no picture?
If you monitor ...ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…
... be a problem there. What voltages do you measure when the ... hum as the +3 has no internal power supply like the ...ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…
... the +3 only have three voltages +5, +12 and -12....
no/sinclair/faq/pinouts.html]this ...Hacking a Joystick InterfaceI have a DK'Tronics twin-port joystick interface that does Kempston and Sinclair 0-6 keys. I know it has only 14 lines connecting it to the edge con…
... (probably) two sources are outputting voltages against each other. So Velesofts ... than solving a decoding problem. (no offence ment, Velesoft, you're ...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…
... , which means that the supply voltages that are within a very ... expected.
5V with no problem, because the 7805 has ... the LCD must to be no more than 400mAh, I think ...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…
Hi
I’m no expert but I don’t ... to check that all the voltages are correct. The PSU supplies ...rubber key Spectrum 48k problem :(when i plug the spectrum in all i get is a black screen with a red border and sometimes flashing blocks. the spectrum worked until about 20 mins ago…
... is [i]always[/i] the voltages on the 16K lower RAM ... still don't get the voltages, turn the machine off [i ... /> If you get the correct voltages, it may boot. If it ... get nothing and no hot chips, and all voltages are good, chances ...TV is on the blink - litterally.My TV has gone on the blink. Its a Philips Matchline 32" CRT (See image below). When I turn it on the sound comes on, it makes the usual Bzzzt of th…
... power supply (CAUTION, very high voltages can be present in some ... you're certain it has no charge).
Look on ...TV is on the blink - litterally.My TV has gone on the blink. Its a Philips Matchline 32" CRT (See image below). When I turn it on the sound comes on, it makes the usual Bzzzt of th…
... =Winston;566176](CAUTION, very high voltages can be present in some ... you're certain it has no charge).[/QUOTE]
At ...ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…
... the 5v supply, the other voltages are only needed by non ... has +5 and +12 but no -12, wondering what will be ...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…
[QUOTE=Spirantho;573500]Looks like no -5V to me....[/QUOTE]
< ... /> Yep I just checked the voltages on all the 4116 chips ...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…
Point taken regarding the multiple voltages generated prior to the 5v ... to be produced and will no doubt go that way once ...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…
... from my spare part box. No change in -5 and 12V ... Speccy is running with this Voltages far away from the specification ... degraded over time to change voltages but the Speccy still running ... be OK, but you never no.
Rgs,
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 pulsating nature of the voltages no real meaning can be attached ...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…
... /> thanks for the equvalents. Still no look so far, I plan ... . Here we go for the voltages:
R60, 100 ohm ...+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…
If you measure the voltages on the PSU now what ... />
If there is still no power it sounds like it ... and re-measure. If the voltages have returned then it looks ...
