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Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …
... the service manual suggested power supply circuit modifications haven't been made ... other Issue 2 Spectrum.
A resistance measurement across the power ... same as on the working Issue 2.
-5V - 80K Ohms ... -
Issue 4S Schematics and DC-DC circuitA while ago I bought a Spectrum 4S that had problems tuning. I removed the RF tuner as I was not going to use it and did the composite mod. It worked…
... , I notice that the standard issue 4 schematics and layout documents ... finding on the DC-DC circuit. So I just wanted to ... -5V from the DC-DC circuit, and can only run the ... -
Spectrum 48k video and keyboard issueHi all, few days ago I experimented with battery supply for my speccy (48k issue 2), and I was measuring the voltage and how much current it used. A…
... supply for my speccy (48k issue 2), and I was measuring ... /> So a short circuit at the input power plug of the speccy ... . The battery had short circuit protection ... -
Which ULA to fit in which issue SpectrumI spent a little while studying the resistor changes on page 30 of the ZX Spectrum 48K service manual. They all concern aspects of the video circuit …
... concern aspects of the video circuit so it will certainly help ... best operation.
Issue 3 and 3B boards are designed for ... and TR2 in the video circuit, which is R49.
circuit, higher in the newer circuit.
R56 ... -
Issue 4S differencesI decided to buy an Issue 4S PCB after reading much about them on here. It was originally in a plus case which didn't come in the sale. I've been run…
... because the Spectrum video circuit already operates the video ... actually different about the Issue 4S. Is it closest ... to Issue 4A or Issue 4B? As a ... The 12V and -5V power supply is much quieter than ... t implemented properly on Issue 4S. Is this likely ... -
Seriously weird Issue 2 issue... (RAM-related)Hi guys; I have been trying to fix up my Issue 2 and have run across a bizarre issue that I haven't seen elsewhere in the forums. Hopefully one of …
... the narrative:
Spectrum: Issue 2, 48k
Initial problem ... VR1,2 fixed the colour issue.
2. MEMCHK returned ... what happens:
On power on, the Spectrum has black ... of the socket against the circuit diagram: all okay.
Three Spectrum main boards (Issue Two, 3B and 4A)I will be offering three partially tested Spectrum main boards (Issue Two, 3B and 4A) on Ebay. All boot to the Sinclair (C) message. All fully popula…
... partially tested Spectrum main boards (Issue Two, 3B and 4A) on Ebay ...Power supply voltage regulator circuitRelating to [url="https://www.worldofspectrum.org/forums/discussion/56142/"]this topic[/url] I have managed to acquire this little accessory, which I…
... be used with the original power supply:
[url=https ... a quick drawing of the circuit as I probed inside (pardon ...Spectrum +3, Issue 2...I have just had plonked on my desk a nice issue 2 Spectrum +3. I'm not sure if its 100% working yet, as I have not plumbed it into a telly. So, assu…
... says it's an issue 2. Does this ... the "3b" is fine, is this the issue 2 + ... ]
Both Issue 1 an Issue 2 motherboards have the ... design flaw in the AY circuit. The "+3B ... leaks interference onto all the power and ground lines.
Spectrum 128k 2a or not 2b....Just picked up a +2 black case version and I'm in as little bit of a quagmire, The case is definitely black, has '+2A' stamped on the bottom, but in…
... board that has the +2B circuit (as most of them ... fitted modification to the Z70833 ISSUE 1 board, this was ... the PCB on the ISSUE 2 and ISSUE 4.
... blanking modified, 2b and 3b are already done to approx ... plus until my atx power supply turns up I can ...+3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…
... flow, and so supplies the circuit with power. As capacitors are not ... a +2A, +2B, +3 or +3B, the voltage regulators are in ... Spectrum...
Further, the power network will transmit any electrical ... test.
The only issue I have is that I ...48K ZX Spectrum 48K Recap (Capacitors) Or Not?I have seen arguments "for an against" on this subject by some "high calibre" experts . So if the experts can differ on this question then my questi…
... ][/b]
Issue 2, 3 and 3B
Capacitors C34, C44 ... thinking about carrying out the power circuitry (DC/DC converter) modification ... .html] here[/url]).
Issue 4A, 4B, 4S, 5 and ... .7uF 10V or 16V
C78 22uF 25V (where fitted)
Four faulty 48k Rubber Keyed Spectrums for SaleOkay, I've finally dug them out and decided to offer them on here, as when I mentioned them once before some people showed an interest. The circuit …
... /> The circuit board issue numbers are:
6A
3B
3A ...Spectrum board Issue numbersWhilst cataloging my spectrums I am documenting the issue numbers of the motherboards. so far I have (all spectrum or smegtrum + Issue TWO 3 3B …
... spectrums I am documenting the issue numbers of the motherboards.
Issue TWO
3
3B
4A
issue 1 and an issue 4 or 5A.
My collection for sale. Full list here!Here's the list of what I am selling. Please contact me at cheggersplayspop*@boltblue.com (remove the *) and make me an offer! TITLE PUBLISHER YEAR …
... 1987 Software Demand' Re-issue
Red Arrows ... Masters ? Compilation
Quattro Power Code Masters ? Compilation
... Encore 1986
Short Circuit Encore 1986
Space ... Compilation. Software Demands' re-issue
Death Star Interceptor ...Spectrum 48K and wrong power supply polarity!!!Hello, I need a help fixing my Spectrum 48K, motherboard issue 4B. Since I'm in Canada, I couldn't use standard spectrum power supply, so I checked a…
... fixing my Spectrum 48K, motherboard issue 4B. Since I'm in ... couldn't use standard spectrum power supply, so I checked all ...Cruiser Power play and a game with a forgotten name problemI have a cruiser power play joystick connected to a +2B but i don't know how to identify it (kempston, cursor, interface 2 ... ) The other issue is…
I have a cruiser power play joystick connected to a + ... , interface 2 ... )
The other issue is a game. My mom ...ANN - ZXSoftware.co.uk Update V1.5 21/05/06ZXSoftware has now been updated to V1.5. Changes :- 299 new titles have been added - Listed below. A few thousend new ingame screenshots and loadin…
... Chaos Firebird Software Ltd
Circuit Drawing / A.C. Network ... Rebound
Hercules The Power House
Hideous Alternative ... Jackson
Video Basic Issue 02 Gruppo Editoriale Jackson< ... br /> Video Basic Issue 03 Gruppo Editoriale Jackson< ...Power issues for multiple Speccies - questionWould like your opinions on some power issues I will be coming across soon! I am building up a collection of working Spectrums to form a music Midi …
... opinions on some power issues I will be ... daisy chain. The issue I have is about power.
power pack. That is fine ... multiple adapter units off one power lead?
... m gonna need about 16 power sockets!! (Screens, Atari, ...Spectrum Issue two problemI managed to bring back to life a issue two spectrum (at least the power supply cirquit). The screen is now crystal clear (after replacing all the el…
... to life a issue two spectrum (at least the power supply cirquit ...Just got a Spectrum +2BThis is the first Spectrum I've ever used or owned. I got it without a video cable or power supply. I wired up a proper video cable, and I altered an…
... without a video cable or power supply. I wired up a ... I altered an old AT power supply to work with the ... far.
The only issue is that whenever I do ... build a simple "ripple filter" circuit to solve this problem- does ...Spectrum ethernet ... first stepsThe first thing I do when I get a strange and unusual chip to play with, is to make a breakout board. The breakout board basically contains the chip …
... spaced, and a 3.3v power connector.
... signal lines and 3.3v power etc.
... />
The first possible issue. Our inexpensive HP laser printer ... , leading to a short circuit, and is a real ... it's the highest frequency circuit I've made at ...Issue 1 80K SpectrumHere's the other Spectrum I acquired last weekend. It's an [URL="http://www.drumfu.com/Issue1.jpg"]Issue 1[/URL] with an [URL="http://www.worldofspec…
... ://www.drumfu.com/Issue1.jpg"]Issue 1[/URL] with an [URL ... 't power up and I don't have any other Issue 1 ...Crash Magazine, the ZX, and the power of nostalgiaI'm currently selling some Crash mags (see Sales section of WOS *PLUG!*) and I started thinking about the power of nostalgia and what keeps us intere…
... I started thinking about the power of nostalgia and what keeps ... hand, I have kept back issue 30 of Crash as my ... game was reviewed that issue, and therefore is important to ... times and have more nostalgic power than other later issues.
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…
... to repair a ZXSpectrum + revision 3b and at the moment the ...Searching for the artistes from The Power House / H.E.X.Hello, my name is Caroline Bren, and this is my first post. Recently, I put out an audio record which some of you may have heard of, under the Feedin…
... by the software distributor The Power House came with his tunes ... /Pages/YourSinclair2300044.jpg"]Your Sinclair, Issue 23[/URL]) tells me is ... on program cassettes from The Power House. A few of these ... of these or any other Power House games that include bonus ...48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…
... it was only the issue one machines that are ... effectively and lets you issue commands to the rest ... replacing the chip fixed the issue, I originally thought it ... socket was providing the correct power, it was, and ... , yet it was open circuit, what looks like a ...Broken keyboard due to broken ULARecalling csmith's thread about dead ULAs, a thread appeared in the Zonadepruebas (Spanish) forum regarding... a dead ULA, but only a partially dead …
... the Z80 (it's an Issue 2). This transistor decodes port ... accomplished by an external circuit.
The circuit is a tristate ... ]
I cabled the circuit with the green wires from ... . With the blue cable, the power (5 volts and ground). With ...Spectrum +3, Issue 2...I have just had plonked on my desk a nice issue 2 Spectrum +3. I'm not sure if its 100% working yet, as I have not plumbed it into a telly. So, assu…
... on my desk a nice issue 2 Spectrum +3. I'm ... board says it's an issue 2. Does this need the ... read that the "3b" is fine, is this the issue 2 +3 ...Power Brick ProblemDear all, i was just Powering up a 48K Rubber Key Speccy using two differnt power bricks. First one from my issue 2 Speccy, second one from an issue…
... using two differnt power bricks. First one from my issue 2 Speccy ... issue 3 Speccy. Both have not caps.
With first power ... first 5 minutes, until the power brick has warmed up. Then ...
