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RF output instabilityHello! Now i need help :) One of my rubber keys (48K) behaves a bit strangely on behave of RF TV output. When booted the picture is stable. Then i …
... on a carefully laid out circuit board. With suitable replacement for ... myself and do the composite mod on it?.[/QUOTE]Well... it ... -
I am currently playing......Don't know if there's been a thread like this, but I can't find one.... Having seen all the different threads asking people if they've played such a…
... ?
My house has circuit breakers, and you can't ... second into the cutscene the power goes off, the wife turned ... -
Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…
... fault in the voltage converter circuit and probably one or ... isolate the 4116s from their power supply lines (cut tracks ... board), repair the voltage converter circuit and re-connect/re-install ... of them have shorted their power supply connections.
... -
Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…
... this test (obviously with the power off):
[URL="http ... anything other than an open circuit or very high reading, I ... are faulty 4116s shorting their power supplies, failing/failed electrolytic capacitors ... -
128k heat sink joystick issuesI have only recently been using my 128k heat sink again - using a scart lead off Ebay that works great on the LCD TV- getting really into it - beats …
... checked my toastrack PSU - your power supply *must* be able to ... needs) then I suspect the power supply is to blame.
circuit board and the various inherent ... -
Strange object, anyone know what it is?[url=http://postimage.org/image/oh3m6vqrp/][img]http://s18.postimage.org/oh3m6vqrp/IMG_9597.jpg[/img][/url] [url=http://postimage.org/image/nsurnxs1x…
Looks like a power supply and multi channel oscilliscope ... ' probably just a potted filter circuit with a few capacitors / resistors ... -
Strange object, anyone know what it is?[url=http://postimage.org/image/oh3m6vqrp/][img]http://s18.postimage.org/oh3m6vqrp/IMG_9597.jpg[/img][/url] [url=http://postimage.org/image/nsurnxs1x…
... =bleugh;628178]Looks like a power supply and multi channel oscilliscope ... ' probably just a potted filter circuit with a few capacitors / resistors ... -
Watch this before booking that holiday to "paradise"[URL]http://www.bbc.co.uk/news/world-asia-18073917[/URL] this really affected me.
... from a normal domestic lighting circuit. This is a terrible way ... lighting with the appropriate DC power distribution. We also need to ... -
My Issue 2 spectrum"IT'S ALIVE!!!!!" - Dr Frankenstein I got my issue 2 spectrum up and running, colours and all. I borrowed socketed lower ram from my issue 3 that is…
For composite mod, I have tried a few ... modulator first or remove the circuit board if you dont need ... -
What's going on during a reset?Always wanted to know this. Why does the screen fill with garbage then white lines on black then just a totally black screen? What is happening?
... to 5 Volt.
This circuit ensures that the the reset ... short period of time during power-up/reset, so the rest ... -
What's going on during a reset?Always wanted to know this. Why does the screen fill with garbage then white lines on black then just a totally black screen? What is happening?
... to 5 Volt.
This circuit ensures that the the reset ... short period of time during power-up/reset, so the rest ... -
Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…
... to about 700mA) to power the Spectrum. The limit ... active for a instant at power on while capacitors charge, ... away, then turn the power off. This will usually ... still a fault in the circuit. I also hook up ... prior to the issue 3b circuit, there should be a ... -
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 …
TR4 getting blown might also indicate something is drawing too much current external to the power supply circuit (faulty 4116 RAM perhaps, or a short somewhere?) -
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 …
... much current external to the power supply circuit (faulty 4116 RAM perhaps ... transistors in the DC-DC circuit, and will probably keep on ... 7805 with a suitable switching power regulator. Might then add some ... -
Spectrum +3 FavourCan a kind soul with a multimeter and a +3 measure the resistance on the power socket between the 5V and the ground? I have a dead +3 that only has 0…
... when gone, prevents the regulation circuit to operate and thus, prevent ... are going to repair the power brick yourself, I strongly recommend ... -
Spectrum +3 FavourCan a kind soul with a multimeter and a +3 measure the resistance on the power socket between the 5V and the ground? I have a dead +3 that only has 0…
... performed by a H1061 medium power transistor, configured as emitter follower ... working. Without it, the regulation circuit for the main +5V supply ... -
ZX 128k +2 Bad deal - BrokenI recently traded a C64 for a ZX Spectrum 128k +2 (grey model). I sent a fully working C64, with doubles of the tapes I had. I recieved a shabby and …
... from it. After doing composite mod on the RF out, I ... I have read. Need new power socket to put plug in ... -
DivIDE and new Kempston Joystick interfaces!I've got some DivIDE and new Kempston Joystick interfaces ready: [IMG]http://benophetinternet.nl/hobby/vanmezelf/divide_batch_may2012.JPG[/IMG] Div…
... the thing yourself to get power to the CF card reader ... ;567672]This is the simple mod you have to perform in ... -
DivIDE and new Kempston Joystick interfaces!I've got some DivIDE and new Kempston Joystick interfaces ready: [IMG]http://benophetinternet.nl/hobby/vanmezelf/divide_batch_may2012.JPG[/IMG] Div…
... don't work without additional power on pin 20.
power.
So my ... have CF adapters with the mod: pin 20 -> ... 35592&highlight=power+pin[/url] (that mod won't work ... &highlight=power+pin[/url] (same: this mod is on ... -
DivIDE and new Kempston Joystick interfaces!I've got some DivIDE and new Kempston Joystick interfaces ready: [IMG]http://benophetinternet.nl/hobby/vanmezelf/divide_batch_may2012.JPG[/IMG] Div…
... I should still try the power mod? There are no lights on ... -
Using an ATX power supply - Spectrum 48kOK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :( There is a MOD to use an ATX power supply on the…
... that when the DC-DC circuit goes, often the lower ram ... I think using an ATX power supply is good, too.
DivIDE and new Kempston Joystick interfaces!I've got some DivIDE and new Kempston Joystick interfaces ready: [IMG]http://benophetinternet.nl/hobby/vanmezelf/divide_batch_may2012.JPG[/IMG] Div…
... he would try to add power to the CF card (pin ... post a picture of that mod:
[IMG]http://www ... on this (component) side: the mod must be added on the ...Internal amp and signal cleaner for tape inHello! Is there known to work INTERNAL schematic which cleans signal from tape in and amplifies it. I need such thing so i can load from my smartpho…
... are quite a few low power ones which have rail-to ... need to drive some external circuit need to be buffered by ... kit which are very low power, but rapidly roll off above ...Replacing Upper RAM in 48KHi Folks Well, my fun continues :) After sorting the display issues with this machine I found I couldn't load software meant for 48K machines. Havin…
Similar mod here: [URL="http://hw.speccy. ... it compares to the external circuit above. As for the original ...Issue 3 power problemHi all, I have an issue 3 board with an odd power problem, I have no -5V in fact, measuring the voltage on this line leads to a surprising result : …
... soon after it leaves the power supply circuit to be able to ... making a noise, the power supply circuit is at least oscillating. If ...TC2068 adhesive front panel and keysHello, decided to to get my Timex Computer 2068 into shape, and as such am looking for a new black front panel, the adhesive kind that goes around th…
... spares. I suspect the TC2068 power supply will drive a TS2068 ... probably do a small case mod if necessary.TC2068 adhesive front panel and keysHello, decided to to get my Timex Computer 2068 into shape, and as such am looking for a new black front panel, the adhesive kind that goes around th…
... spares. I suspect the TC2068 power supply will drive a TS2068 ... probably do a small case mod if necessary.[/QUOTE]
48K and wavy lines.It seems all Spectrum related things are breaking here at casa de Don Pedro. After the problem with my old ZX81, I went over to my issue 2 ZX Spectru…
Check capacitors in the power supply parts of the circuit. Unsmoothed crap on the 12V line might be the culprit.ZX81 with black screen and some white dots.Was gearing up to do a composite video mod on my ZX81, and today was going to be it. Unfortunate when started my ZX81 seems faulty. I get a back scre…
I made a small circuit for fixing this issue:
[ ... able to do a transistor mod to your ZX81, I'm ...ZX81 with black screen and some white dots.Was gearing up to do a composite video mod on my ZX81, and today was going to be it. Unfortunate when started my ZX81 seems faulty. I get a back scre…
... the ZXVid or Mcleod_ideafix's circuit than you will ever get ... -hole version of Mcleod_ideafix's circuit. Am preparing a list of ... there. Building my own video mod does add value to the ...
