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A tally on the number of successful builds of the Harlequin[SIZE=4][COLOR=Green][U][B]A tally on the number of successful builds of the Harlequin.[/B][/U][/COLOR][/SIZE] Please post your successes below :-) …
... and rewire them, and the power connector didn't fit well ... and cassette input, but after replacing U6 (from an LS to ... -
Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…
... with a higher rated power supply, or replacing the voltage regulator (could ... -
Simple Question! RAM InterfaceI was messing around on my spectrum yesterday and blew it up! Im sure it has to do with the RAM joystick interface I bought but hadn't tested. Is the…
... the expansion connector while the power was on or had a ... the Spectrum's voltage converter circuit has failed. It is also ... fault in the voltage converter circuit has been corrected. Other faults ... -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... 4116 RAM ICs. Do not power on again until this has ... have access to a bench power supply or similar, using it ... to power the Spectrum and limiting the ... to notice the voltage convertor circuit is overloaded before TR4 is ... -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... 4116 RAM ICs. Do not power on again until this has ... have access to a bench power supply or similar, using it ... to power the Spectrum and limiting the ... to notice the voltage convertor circuit is overloaded before TR4 is ... -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... component in the voltage converter circuit is faulty (it'd be ... /> For some reason my switching power supply is not working :confused ... -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... be just a case of replacing the 4116's you've ... go bad without shorting their power rails), and then moving on ... -
48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…
... more soldering power (25W) works better.
After replacing IC22, all ... not seem to get any power or signals (no LEDs burning ... transmits a signal. Surprisingly, the power circuits are ok: I measure ... -
divMMC ENJOY wont work with 48+it works with my 48+ ver 6b with my 128+,my 128+2 128+2a 128+2b but not the ver 4 48+:confused:,the green light stays on the blue light never comes o…
... with a clock signal amplifier circuit. These tests were promising. Details ... + while it was under power. My laboratory power supply detected the overcurrent ... -
Introduce yourself[SIZE=3][FONT=Comic Sans MS]This is the thread to stop by & introduce yourself.[/FONT][/SIZE]
... keyboard membrane, escutcheon plate, power socket on the mobo, ... and also the power regulator for a modern ... the ULA and maybe replacing the Z80A with a ... nice to replace the power brick from the ZX81 ... Speccy, other than the power saving and reduction in ... -
Spectrum 48k picture quality distorts after 10 minsWould this be something to do with capacitors? the picture is fine then after 10 mins of play the quality goes bad sort of like the some of the colou…
... a bit unusual for this circuit to suddenly go out of ... in your case. I recommend replacing all of them in your ... -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... voltage which kills the oscillation circuit formed by the coil/TR4 ... />
I have a other power supply (non-sinclair) 9 Volts ... -
Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…
... from your Speccy altogether and replacing your old regulator with a ... produce any heat, are more power efficient, and you can sack ... -
AAAARRRRR DIV-MMC ENJOY againIve recently been posting trying to get to the bottom of problems with my +48 not working with this rechid addon.Now ive finaly worked out theres not…
... picture :D.
The circuit that TR4 and TR5 are ... later version of the same power supply section that has been ... -
AAAARRRRR DIV-MMC ENJOY againIve recently been posting trying to get to the bottom of problems with my +48 not working with this rechid addon.Now ive finaly worked out theres not…
... and maybe pulled too much power and the +128 just couldn ... assuming that the whole +128 power supply circuit is ok?
If ... -
Toastrack refurbishmentYesterday I opened a drawer in my old desk and discovered 2 complete toastrack 128s and a board only for the same. As I already have a fully working…
... from the external ?9V? power supply. Some of the current ... noise escaping via the dc power cord.
[ ... chips have foldback current / power limiting protection circuits. The exact ... regulation, destroying the circuit fed by this power supply :x.
Help me fix my grail ZX 128k SpectrumHi all, Ok today my grail toaster rack ZX spectrum 128k turned up. I finally found one and for a reasonable price. I powered it up and..... Nothing …
... /> Verify that you've got power coming from the PSU, and ... all this checks out, try replacing the regulator with a 7805 ...Zx Spectrum 128k Toaster RGB pinoutHi all When I use my +2 scart cable on my 128k the picture looks terrible, so I have bought the din plug to make my own. Most sites from what I ca…
... the Toastrack 128K Spectrum the circuit shown on Paul's site ... method using an external 12V power supply. I personally use the ...Burned finger temp on rubber 48k heatsink normal?Ok so i opened it up because a few keys started to act up and i noticed that after burning my hand the heatsink was that hot i could actually smell t…
... have its own separate power supply. It's also ... input from the external power supply is at a ... br />
Reducing the power supply voltage (provided it is ... a bit.
Replacing the 7805 regulator with a ... by Recom and XP Power with success. Make sure ...Burned finger temp on rubber 48k heatsink normal?Ok so i opened it up because a few keys started to act up and i noticed that after burning my hand the heatsink was that hot i could actually smell t…
... mind that inside of the power supply there is a fairly ... that I should also consider replacing, after all, it must be ...Burned finger temp on rubber 48k heatsink normal?Ok so i opened it up because a few keys started to act up and i noticed that after burning my hand the heatsink was that hot i could actually smell t…
... mind that inside of the power supply there is a fairly ... that I should also consider replacing, after all, it must be ... , as I did in the power supplies video. Otherwise, it'd ...Powering a Spectrum with 5v?I live in the States, but I'm originally from England. My original Spectrum is still at my mum's house in the UK, and I was thinking of asking her t…
... recommend obtaining a US mains power supply that outputs 8 - 9 ... pin of the Spectrum's power input connector must be connected ... probably would be possible to power the Spectrum directly from a ... a simple switching voltage converter circuit. I don't know whether ...Powering a Spectrum with 5v?I live in the States, but I'm originally from England. My original Spectrum is still at my mum's house in the UK, and I was thinking of asking her t…
... two derived from a switching circuit inside the speccy which runs ... />
If you tried to power it up with only the ...Powering a Spectrum with 5v?I live in the States, but I'm originally from England. My original Spectrum is still at my mum's house in the UK, and I was thinking of asking her t…
... the first stage of the power input?[/QUOTE]
The ... the internal switching power supply circuit, which draws its power from the "+9V ... that this part of the circuit has a connection to the ... of the Spectrum that needed power as well).
[B ...Help put this back to 16kSo this issue 2 arrived today and ive opened it up just to nosey and confirm that infact it is an issue 2. Now from the help offered in an earlier po…
... range. Make sure the circuit is switched off and capacitors ...
If not all the power supply voltages are present, then ... :
- Basic measurements (power off) to check for shorts ... any problems, power on (using a bench power supply with current ...ZX Spectrum 48K Issue 3, loss of -5V rail.Hi all, I've googled this problem and poured over the electrical diagrams for the circuitry concerning the power supplies and I believe I know what …
... such that it is open circuit, this will work.
power supply line(s) (a typical ...Burned finger temp on rubber 48k heatsink normal?Ok so i opened it up because a few keys started to act up and i noticed that after burning my hand the heatsink was that hot i could actually smell t…
... a capacitor does on a circuit board and that will make ... replace caps on a switching power supply board (monitors and LCD ... to jump start the switching circuit. Its value probably changed over ... bad quality but because the circuit design is flawed putting too ...The ULA6C001E-5...Hi everybody, I have been continuing my Quest for the Holy ULA, and have today taken delivery of a ULA6C001E-5. Now, the -6 was used in Issue 3 boar…
... a newer ULA process, lower power and possibly a smaller die ... they had a new video circuit ready, and a new position ... in the Issue 3 video circuit are the removal of the ... was moved onto the main circuit board so this space was ...The ULA6C001E-5...Hi everybody, I have been continuing my Quest for the Holy ULA, and have today taken delivery of a ULA6C001E-5. Now, the -6 was used in Issue 3 boar…
... 6C ULA was to reduce power consumption. It was Ferranti's ... the Sinclair Issue Two video circuit. The values increased in size ... . Hence, on the circuit board, the pull down resistors ...Burned finger temp on rubber 48k heatsink normal?Ok so i opened it up because a few keys started to act up and i noticed that after burning my hand the heatsink was that hot i could actually smell t…
... remember that the original Spectrum power supply was a
... transformer (which is why power is transmitted as AC).
power supply units ("bricks") are. ... a very stable voltage reference circuit, it then uses various electronic ...
