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Revive Spectrum +3 power supply(ies)Hi all, it's me again... [url]http://www.worldofspectrum.org/forums/showthread.php?t=33677[/url] In continuation from last time, I have two original…
... two original non-working +3 power adapters.
I am ... /> N.B. My ATX power supply mod with DIM plug is still ... -
Issue 3 /3b power rail improvements<!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:AllowPNG/> </o:OfficeDocumentSettings> </xml><![endif]--> <p class="MsoNormal">Hi F…
... added components
to the power circuit on these machines, an extra ... /> The changes must improve to power rails around the pcb and ... -
No serial numberI recently bought a 1982 issue 2 spectrum which I believe is a 16k upgraded to 48k. There is no serial number on the case. Does anyone know why th…
... to the power circuit. And the composite mod and replaced the power transistors. Just ... -
Power issues on a 6A 48 K SpectrumHello all! I decided to take another look at my 6A Spectrum that I broke via a bad joystick adapter, I’ve removed the bottom 16K ram and replaced…
... , there's a botched composite mod I need to fix to ... , something destroyed the power circuit with the short circuit of the edge connector ... -
Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... Opuses (although not the Multiface mod on them) are now working ... year Big Brother's Opus mod was non functioning in exactly ... both have the same Multiface mod fault
2) ... power circuit to the PCB and this has somehow affected the Multiface mod ... -
Two new spectrums arrived. One no video.Got a +2 and a Toastrack arrived today. Toastrack was actually in good condition, little wear, though a little dirty. Worked well on first power up, …
check the composite mod is actually going to the ... and not where the RF mod takes its input .. check voltages ... transistors that are responsible for power circuit that can fail especially if ... has stuck a positive center power supply into her .TR4 i ... -
16pf Capcitors for C72/C73 issue 3b. Can I use 18pf?Looking at the service manual it states to use a 16pf ceramic disc capacitor in positions C72 and C73 on issue 3b boards. Is this very critical in bo…
... on doing the issue 3B power mod ?
i intend on ... 5/12 volts so no power circuit .. and either a lower ... 4164 ram with small mod so the correct pins ... when it has a composite mod (reversed pin out though) ... need to do a small mod for the diagnostic rom ? ... -
Bad (new) 100uF caps causing video disturbanceJust to let you know about one of my small experiences: I had a couple of 48K boards I was refurbishing: new electrolytic caps, composite video, te…
... , maybe some part in the power circuit.
But when testing the ... -
Help with 128k greyHello friends, need some help here on try fixing a +2 grey spectrum128. To keep it short, opened the case and the voltage regulator was missing, the …
... ztx213 and 650 in the power circuit, then z80 was dead and ... -
How can I fix a problematic Retroleum Smart Card. I did not do anything "WRONG " with it but I did but it on a flexible cable and this seems to have "upset" it .Since then It does not perform the …
... was not pulled apart with power on just use with ... broader question is "What power circuit protections can be built into ... protect against the usual interface power (pulled apart with) on ... the ideal level of electrical circuit protection for interfaces like ... -
48K Issue 3B slowly fading over 15-20 seconds, capacitor gets hot.Hi folks, Recently my much-modified* RAM testing 48K board failed with a hot/burny smell so I turned it off quickly for looking at later. Thinking…
... /> Something's failing in the power circuit and causing a short but ... -
lazy fat b'stard moderatorwell i have tried to join another forum and am still waiting for confirmation to join. i mean what else can he be doing, chances are he works from h…
yeah there are some power mad mod's out there.
... -
lazy fat b'stard moderatorwell i have tried to join another forum and am still waiting for confirmation to join. i mean what else can he be doing, chances are he works from h…
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 …
... is to check that the power circuits are working correctly. With ... that the rest of the power circuit is working. The Speccy has ... failed RAM rather than failed power circuits. Also, checking the ... components that have failed short-circuit.
There's ...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…
...
Anyway, on checking the power supply voltages:
With ... that the rest of the power circuit is working. The Speccy ... failed RAM rather than failed power circuits. Also, checking the ... components that have failed short-circuit.
There' ...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…
... Issue 2 suggests that the power supply that generates some of ... (+12v) is a switch mode power supply, which gets regulated by ...Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…
... been caused by a flaky power circuit...
Don't panic ...Composite Video output problemHi everyone, I?ve got a problem that?s really bugging me. I have one Spectrum 48K and one Spectrum +3, both with Composite Video output modification…
... drive the speaker and the power regenerator circuit. It is pushed through ... .
Either your power circuit (check circuit diagrams available on WoS archives ... doing strange things to the power circuit.
I have some ...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 …
...
Sounds like the power circuit is uh.. "Failed Under Continuous ... your problems. The power supply circuit is probably not providing ... RAM chips until the power circuit is confirmed working again, ... are used in the power supply circuit (these probably need ...Blown standard divideI recently bought a SIY divide kit from Papaya labs and after i soldered everything, it worked perfectly. I've used it 5-6 times without problems (Fa…
... especially not for burning the power circuit transistor because this transistor is ...Blown standard divideI recently bought a SIY divide kit from Papaya labs and after i soldered everything, it worked perfectly. I've used it 5-6 times without problems (Fa…
... especially not for burning the power circuit transistor because this transistor is ... connected a kempston interface (with power off ofcourse).
The ZTX650 ...Spectrum ULA replacement!Hi gang.. The Speccy 48 ULA Replacement is *almost* here ;) There has been lots of activity in building the CPLD board, sorting out some irritating…
... break TR4 of the speccy power circuit, and whilst checking the voltages ...48K specs boots, but THEN blinking blocks!Of all ZX problems I have seen, the 'blinking blocks' is the most common... Today I picked up a 48K, it boots and THEN it locks filling the screen wi…
Definately check the power circuit outputs (+5v, -5v and +12v).< ... up.
If your power is not stable, then you ...Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…
The transistors in the power supply aren't particularly critical. ... Spectrum with a huge power transistor in the power circuit instead of the ... to breadboard the Spectrum internal power supply and test its performance ...Issue 2 Spectrum overheating keyboard membraneI think I have an issue 2 ZX Spectrum. I don't want to take it apart again as I had problems replacing the keyboard membrane. With Interface 1 conne…
... +/-12volt and -5volt switching regulator circuit around TR4/5 (not sure ... consider replacing the entire internal power circuit with a more modern solution ... to reduce the power burden of the overall circuit, e.g. by ...ZXPROJECT update: a replacement for TEA2000Just go to [url]http://www.zxprojects.com[/url]
... transistor belongs to the supply circuit, and it may be related ... /plus2layout.png[/url]
POWER CIRCUIT
[url]http://zxm.speccy ...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 …
... /> So, assuming, ZX after "power path" mod should start with :
a ... /stuff/zasilacz/20090514500.jpg"]power supply[/URL] to power my atari (lothAri ...Where's the border line between a Spectrum and something else?I mean: there are purists out there that consider that anything that is not a true Sinclair Spectrum, with a true Z80 and a true ULA, and at most, 48…
... , anyone who has replaced the power circuit, RAM, ROM, Modulator etc in ...Help needed +2 pleaseI have a 128k+ that when powered up through the rgb or aerial connection just shows a black screen. But I can still see the list of options and run d…
... , it forms part of the power circuit).
As I said ...zx spectrum ULAis the ULA in the 16K the same as in the 48K could you take the 16K ULA and place it in a 48K I ask this because i have a speccy thats dogy with th…
... /> Possible cause TR4 of the power circuit blowing, and taking with it ... connected one up with the power supply completely reversed, and it ... />
You can test the power supply with a multimeter. If ...
