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Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …
... ;TR5 and your Spectrum doesn't have +12v or -5v used for ... .
Without this signal, spectrum can't start ( it can ... used the video ram where spectrum put some information) and it ... hit any of the keys? No such sound...:-( -
dead issue 6a boardI've just been back to the uk and found my old 48K + there - and bought it back with me to singapore - it's giving white border and red bars. From wh…
No, I mean the supply circuit inside the Spectrum, a DC-DC transformer that generates 12V and -5V off from the 9V main supply. -
Dead 48K Speccy.Blow this up as a child... thought I'd get it down from the loft and see if I can repair it. Upon power up, it displays this: [IMG]http://i266.photo…
... circuitry.
I assume no composite video mod (like [URL ... blogspot.com/2008/11/zx-spectrum-composite-video-mod.html"] ... regulator). And the Spectrum internally generates +12 and -5V from this (check ... test the ULA in another Spectrum? You might want to ... -
Dead 48K Speccy.Blow this up as a child... thought I'd get it down from the loft and see if I can repair it. Upon power up, it displays this: [IMG]http://i266.photo…
... />
[QUOTE]I assume no composite video mod (like [URL ... blogspot.com/2008/11/zx-spectrum-composite-video-mod.html"] ... channel? [/QUOTE]
No composite mod, it's totally ... regulator). And the Spectrum internally generates +12 and -5V from this ( ... -
Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…
... . No one of these power supplies carry the same voltages a Spectrum ... .
The +2B needs +5V, +12V and, if memory serves ... : female power jack for taking +5V from the monitor, male power ... . Watch out for the polarity: +5V jack has positive center, while ... -
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…
No one component directly produces the -5v, a complete circuit (usually ... mode power supply) makes the -5v. However, if any one ... your SMPS, and therefore your -5v supply.
A ... be destroyed if the -5v isn't present when any ... prone IC in the Spectrum. -
Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
... caused the death of the Spectrum.[/QUOTE]
Don ... not actually connected to the Spectrum. On-load, the voltage ... . Pin 1 should be -5V, Pin 8 should be + ... Pin 9 should be +5V. If -5V or -12V are absent ... is a very quick "yes/no" repair to do, before ... -
Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
... service manual :[/B] [I]"If no fault has been found and ... sockets, is to remove the +5V from IC25. This is probably ... to pin 16, the zx spectrum should initialize, right ? -
Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
... is to remove the +5V from IC25. This is probably ... 9 for R71) to +5V. That would prevent #CAS ... the zx spectrum should initialize, right ?[/QUOTE]
Uhm... no. The ... disabling it. But the Spectrum needs the [B]lower ... that's broken the Spectrum won't get to ... -
Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
... ?[/QUOTE]
Ehm... no. Not for a one- ... are +5V only, maybe they work as Spectrum lower RAM ... Sinclair-supplied brick (with no peripherals connected). And as ... mA for factory-fresh Spectrum 48K), and I haven ... hot no matter [I]how[/I] you run your Spectrum... -
ZX 48K loudspeaker with 8 Ohm possible?Is it possible to change the loudspeaker from the ZX 48K with a model which has only 8 Ohm? Micky
... far less than 9V, or 5V, and that's consistent with ... : PAUSE 0, as there's no capacitors that block the DC ... don't know of a Spectrum speaker being damaged because of ... -
So you need to double (or triple, or quadruple) the clock speed...No particular reason for posting this, other than I was looking at an eZ80 evaluation board that does this, and that jogged my memory of a project I'…
... so, -rubber key- ZX Spectrum isn't very solder-friendly ... full 0v to 5v swings (it's a 5V chip)[/QUOTE]< ... a CMOS chip working @5V internally, but... no it doesn't. I ... level output voltage is ~3.5V. Just check with a ... to allow 3.3 & 5V [I]output[/I] levels. ... -
Who can repair a 48K Spectrum?My Spectrum is broken, please see: [url]http://www.worldofspectrum.org/forums/showthread.php?t=29351&highlight=7805+heat+sink&page=2[/url] Does anyb…
... also output from the Spectrum, you'd have a ... ups (~47K ohm to +5V supply) on important control ... for 8-bitters like the Spectrum (pull-ups inside the ... add-ons, not the Spectrum). A loose contact then ... tightly).
No clue what happened here though ... -
Who can repair a 48K Spectrum?My Spectrum is broken, please see: [url]http://www.worldofspectrum.org/forums/showthread.php?t=29351&highlight=7805+heat+sink&page=2[/url] Does anyb…
... pull-ups (~47K ohm to +5V supply) on important control signals ... for 8-bitters like the Spectrum (pull-ups inside the add ... in place tightly).
No clue what happened here though ... actually damaged something inside the Spectrum. To be 100% clear this ... -
Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …
... small ones?[/QUOTE]
No, that's not the point ... , which is neccessary for the -5V of the D-RAMs, there ... 's as they developed the Spectrum.
I gained the ... -
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…
... +12v and +5v are supplied before -5v, internal biasing conditions ... destroy the chip.
The Spectrum does no ... mode supply on the Spectrum's motherboard). Most of ... in a "colour puke" dead Spectrum.
Today, ... -
Opus Discovery 1 problem insideHi folks, when I opened my Opus Discovery 1 I have probably wrecked a regulator that is connected to the mainboard by three cables. Regulator 2 is wi…
... V has no other use. The UNregulated power also feeds Spectrum. It ... />
Regulator REG2 handles the 5V. Note that the middle connector ... -
Faulty +2A questionDug out some Spectrums earlier and amongst them I had +2A's which i've never even bothered to power up. First one powered up no probs, clean picture …
... />
the capacitor is between 5v and D6 and isn't ... /> [url]http://alistairsserver.no-ip.org/public/spectrum/schematics/+2Bschematic.png[/url] -
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 …
... [URL="http://alistairsserver.no-ip.org/public/spectrum/schematics/+2A+3schematic.png ... "]http://alistairsserver.no-ip.org/public/spectrum/schematics/+2A+3schematic ... IC18a is directly connected to 5V ... :-o -
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 …
... [URL]http://alistairsserver.no-ip.org/public/spectrum/schematics/+2A+3schematic.png ... IC18a is directly connected to 5V ... :-o[/QUOTE]
erk ... it is heh.
No idea how that got in ... -
NEW TO SINCLAIR; HELP ON BUYING SPECTRUM 48khey, i have recently discovered the spectrum while surfing the internet and have quickly become obsessed in obtaining one. One problem : I am very kn…
... com/2008/11/zx-spectrum-composite-video-mod.html ... com/2008/11/zx-spectrum-composite-video-mod.html ... 100uF/10V capacitor (+ to Spectrum insides, - to center pin ... is not needed or makes no noticeable difference.
5V supply that goes into ... -
Powering up a Speccy after long-term storage.Staying at my folks for Christmas. Feels good to be back in God's country again, even if it is -12C outside at the moment. :-o Anyway, I was plannin…
... caps at the +12V or -5V supply rails are malfunctioning, those ... with polarity!!!!!!
- Connect the Spectrum to the already turned on ... to the mains.
- If no picture shows up, not even ... close to the computer. If no "buzzz" is heared just after ... -
Powering up a Speccy after long-term storage.Staying at my folks for Christmas. Feels good to be back in God's country again, even if it is -12C outside at the moment. :-o Anyway, I was plannin…
... and efficiency increases btw!), which Spectrum's internal 7805 regulator will ... input voltage stays above ~7.5V at all times. If ... be gone - again no damage to the Spectrum. So original PSU is ... but 'degrades gracefully', the Spectrum isn't picky, and efficiency ... -
Am27c2001Hi, maybe someone can help me. I own a IF2 Cartd. from Paul Farrow. It works well until 128kb.EPROM but I have some IC's with 256kb and I want to us…
... =orange;500760]@guesser
cool, no need for 'debounced' switch, either ... 'm just switching between a 5v and 0v line onto an ... )
as long as the spectrum isn't trying to read ... -
Upgrading 16k MemoryHi All I have a fully working issue 2 16k spectrum and a broken issue3 48k spectrum (It's showing the black and white bars and some flashing blocks)…
... :
[LIST=1]
[*] Check +5V voltage to be sure it ... ), but no upper 32K memory chips & see if Spectrum gets to ... memory chips that prevent the Spectrum from booting.
[*] Once ... upper 32K chips inserted & Spectrum still boots, run some test ... -
Strange DivIDE ScreenI've just got an SD card adaptor for my DivIDE and it does something strange. On startup, I can see the DivIDE logo and it registers the adaptor, bu…
... a power problem - there's no power when I start up ... question is, if I provide +5V on the power connector or ... interface draws power from the Spectrum edge connector to power 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…
... 12V pins and past 5V on the 5V pins. I also checked ... it was plugged into the spectrum, and it did the same ... /> There is no hum or operating lights coming off the Spectrum. I ... something is wrong with the 5V supply. -
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…
... /> There is no hum or operating lights coming off the Spectrum. I ... hum as the +3 has no internal power supply like the ... it plugs in should have 5v between the two pins and ... 's not present then the 5v supply is definitely bust. -
Grey +2 regulatorIv just checked the regulator and its a TS2940. Could someone tell me the equivalent please?
... [url=http://www.nvg.ntnu.no/sinclair/images/spec128pcb.jpg]128 ... .co.uk/L78S05CV-78S05-REGULATOR-5V-/190504555499?pt=UK_BOI_Electrical_Components_Supplies_ET&hash ... is eminently cool - if you spectrum was able to draw 3amps ... -
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…
... lines, there'll be a +5V and Gnd and the rest ... no reason whatsoever the D'Ktronics interface killed my rubber key spectrum ... went on to kill the Spectrum + that replaced it, and 2 ...
