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Keyboard has a life of its own?I just received a Spectrum+ Issue 4S, where I had to replace the MIC connector and I also did the Composite mod. So far it works just fine, but when …
... /> Have you done the standard power supply voltage tests?
That ... the Spectrum disconnected from the power, measure and check the R65 ... the issue 4 Schematic as the issue 4S is based on the issue 4 ... -
Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…
... ]
Here is the full schematic of +3b:
[URL="http://i239 ... has nothing to do with power, the reason it's down ... spread out all around the schematic. Same deal with IC18, 19 ... -
The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... the pcb with the corrected schematic. It was OK as long ... was suggested will solve this issue, but first I will have ... there is some timing issue regarding reset or power on that would ... -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... powered on for a while, power down, remove the 4116 DRAM ... 4116 pin-out and the Issue 2 schematic but keep in mind ... may be errors in the schematic).
[I][B]Mark ... -
ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
... just noticed that the schematic for the issue 4A/4B has a ... is in the issue 4B part of the schematic, the issue 4A part ... sockets yet.
Now power up and retest all the ... -
Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …
... look at the schematic for the on board switching power supply for ... ...
Careful as the same issue board may have been modified ... ... The issue number is not reliable in ... -
RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…
... menu.
When I have issue with TV, I do as ... you can play with external power for blanking or resistor values ... />
I will look for schematic of my Philips CRT, so ... -
Cooking toastrack... the dreaded smellI powered up my Spectrum 128 (heatsink model) yesterday only to see what looked like an out-of-tune picture on the television. I'm using a scart adap…
... line to ground, or an issue with the coil.
The schematic for the power conversion circuitry for the ... -
12V ripple with lower ram installedI repaired a speccy this week. Before doing anything I replaced all caps and measured the transistors in the power section. When doing this I found t…
I thought there wasn't much difference between the 3 and 3b so I was looking at the 3 schematic, seems the power section did have some changes, and different numbering. C7 it is :) -
12V ripple with lower ram installedI repaired a speccy this week. Before doing anything I replaced all caps and measured the transistors in the power section. When doing this I found t…
... and 3b so I was looking at the 3 schematic, seems the power ... the output from the external power pack was greater than around ... marked as C7 on the 3B schematic, but this is an error ... -
Getting a +3 working again (keyboard & tape socket issues)So, as part of my Spectrum restoration project I will also try to tackle the problem child among my fleet, the +3. PROBLEM ONE: Ever since I firs…
... . Might that also be an issue here?
[quote ... Spectrum +2A/+3, +2B, and +3B here[/url]. [url="https://www ... /> At least, looking through the schematic, I can see pin 30 ... -
Harlequin Rev G - Decoupling Capacitors?Guys - I started assembling my Rev G Harlequin board over the weekend. Right after I picked it up and started loading parts, it struck me that there…
... the entire design, [i]including power and ground distribution[/i] was ... designer put them on his schematic, and that board [i]mostly ... . So, maybe there is no issue. That's why I was ... -
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…
... fitted modification to the Z70833 ISSUE 1 board, this was incorporated ... the PCB on the ISSUE 2 and ISSUE 4.
Other ... the blanking modified, 2b and 3b are already done to approx ... line, plus until my atx power supply turns up I can ... -
Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…
... have not found it, the 3B schematic is on WoS [url="http ... TR4/TR5 with a later (issue 6A) design ([url="http://www ... if this is only for issue 4S boards or if it ... affects other issue boards.
[b][i ... -
48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…
... I believe is an issue between the Z80 and ... board. However, only the issue 6A now works.
... bit perplexed why the 3B and the 4S should ... [*]Print out a schematic for the relevant issue board, then check ... (polarity) as on some issue boards, there is a ... -
48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…
... 4.90v (Both), 12.1(3b) and 11.85(4S) and ... -4.9 (3b) and -5.15(4s) - for ... /> "Print out a schematic for the relevant issue board, then check that ... round (polarity) as on some issue boards, there is a screen ... -
Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…
... at. But going from the schematic, they are listed as C1 ... capacitors in the ULA’s power rail.
[quote="1024MAK ... (not likely to be an issue if the smoothing capacitor in ... -
New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…
... noisy display when compared to issue 2.
I am ... -video modded spectrums (board issues 3B and 4S) and none looks ... change to a regulated/filtered power supply.
Sorry, I ... viewing computer displays but your issue 2 isn't looking all ... -
+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…
... so supplies the circuit with power. As capacitors are not perfect ... 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 ... -
RS232 connector dead? No light gun seenHello Today I tried to play some light gun games, which use a controller connected to the 431A socket which is labeled as "RS232" using a BT 4 co…
... /fixing-keypad-issues-on-an-issue-6k-128k-toastrack/[/quote]
issue.
R137 in the ... a 15Ω. The widely available schematic by Ian Worsley also lists ... the light gun will draw power from the appropriate port (probably ... -
ZX Interface 1Hi, I have a ZX Interface 1 which I have bought online. It does not seem to work. When using CAT1 or any other specific commands, the compute…
... .pdf"]here[/url].
Schematic [url="https://www.worldofspectrum.org ... Interface 1 is compatible with issue 2 (TR6, the “spider” ... be fitted though) to issue 6A 48K and Plus machines ... the 2A, 2B, 3 or 3B Amstrad designed machines.
< ... -
Quirky nerdy hardware quiz time[b]Quirky nerdy hardware quiz time[/b] [list=1][*]How many transistors are on the issue one ZX Spectrum PCB? [color=#FFFFFF].[/color] [*]Which d…
... were fitted with the Z70500 issue three boards[/color][/b]. Your ... points to McKlaud for saying issue three boards :D
[color ... />
[*]What’s the rated power output of a Sinclair UK1400 ... ZX Spectrum +2A/+2B/+3/+3B computers can be configured to ... -
Repairs and Reparing.Hi All, Just finished resurrecting an Issue 3A board. Had black lines, so replaced the lower 16K RAM chips, Amazed they just cost a couple of doll…
... , +2, +2A, +2B, +3 or +3B machines (plus many other classic ... connected or disconnected while the power is on). As are the ... logic chips.
On issue 5, 6a, 128k (toastrack) and ... been fitted (boards with an issue number of 4a or lower ... -
spectrum48k power supply?Hello, I live in the U.S. and I need to get a power adapter for the spectrum 48k comparable to the original. I needed to know all the specifications…
... I need to get a power adapter for the spectrum 48k ... -
SPECCY+2 110V POWER SUPPLYI live in the USA and I bought a ZX Spectrum 128k +2 in eBay.com. The problem is that i don't know how to turn it on. All the major US appliances use…
... 110V ac to 9v dc power supply would be enough. I ... -
Crash Issue WantedI'm after a copy of my favourite Crash issue which is Issue 59 - December 1988. I don't need the tape, because I don't have a real Speccy, but would…
... of my favourite Crash issue which is Issue 59 - December 1988.
issue. It was the first one ... -
Power House Games and Mimzoid Death Dude For some bizarre reason, I'm trying to collect all the Power House games and any games by Grant Jaquest. I particularly want Odd Ball and Mimzoid D…
... trying to collect all the Power House games and any games ... -
Power Packi have a tape which is tape two of ?? and has POWER-PACK on the top. it has games from Martech but i cant put a name to it or find any info. on side …
Replacement power suppliesIs it possible to get a replacement power supply for the old speccys? The high Amperage is a problem: 1.4A for the rubber-keyed 48K. Know where you c…
Is it possible to get a replacement power supply for the old speccys? The high Amperage is a problem: 1.4A for the rubber-keyed 48K. Know where you could get one that would handle it? It wouldn't need to be an original.
