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ZX Spectrum 48k issue 3b power problem?Hi :) I was lucky enough to find a couple of ZX Spectrums at a car boot sale yesterday. I spent the evening fiddling about with one (issue 2) and t…
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The second is an issue 3b. I am willing to fiddle ... the coil near where the power lead goes in during this ... wondering if this is a power issue? Its like it is deliberately ... cutting off its own power.
Thanks in advance ... -
48k + Issue 3B Power SocketHi All, Trying to get a Issue 3b resurrected that had a faulty power socket. The socket has come away from the board and peeled away some of the tra…
... to get a Issue 3b resurrected that had a faulty power socket. The ... -
Issue 3B woesHello there, I currently have a Issue 3B for repairs around, it used to have broken upper and lower RAM, which I replaced with 41256-120 DRAMs (hac…
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I currently have a Issue 3B for repairs around,
it ... connected.
On power down the issue remains until I let ... previously verified in another computer, issue persists when swapping ULA & ... -
Issue 3B turning offI'm trying to save a Spectrum Issue 3B. I restored the power supply section, changing the 7805, TR4, and TR5, besides all electrolytic capacitors. No…
... to save a Spectrum Issue 3B. I restored the power supply section, changing ... some more failures on the power supply section but I'm ... -
Issue 3B problemHi! I have an issue 3B board that is having a strange problem: when I got it it didn't had the -5V and +12v, as usual. After replacing TR4 and TR5 t…
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I have an issue 3B board that is having a ... -
48 Issue 3b working but very hot ula and cpuSalve to everybody I bought from e*ay an Issue 3b 48k , fitted in a + case. Fixed the keyboard problem with a new keyboard membrane from good Rwap (w…
... bought from e*ay an Issue 3b 48k , fitted in a + case ... -
Issue 3B(S)?Got an Issue 3B rubber in today, all boxed up but a sticker on it that states it was made in Korea, hmm, 4S then I think, till I opened it up. Same …
Got an Issue 3B rubber in today, all boxed up but a sticker on it that states it was made in Korea, hmm, 4S then I think, till I opened it up. Same colour board as a 4S but its a 3B, first one like this ive ever come across -
Tape loading problem with Issue 3BI have an Issue 3B 48k that doesn't seem to want to load any tapes. I have an MP3 player connected to the EAR socket. When I type LOAD "" and start p…
I have an Issue 3B 48k that doesn't seem ... same setup working with my Issue 2, where the stripes appear ... -
Issue 3B no soundI just noticed that there's no sound in the Issue 3B Speccy that I've been fixing. Is it more likely that the speaker is bust or is it TR7 and D9? …
I just noticed that there's no sound in the Issue 3B Speccy that I've been fixing.
Is it more likely that the speaker is bust or is it TR7 and D9? Or both? -
Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…
... /> I've been donated an issue 3b which has some nice black ... -
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…
... positions C72 and C73 on issue 3b boards. Is this very critical ... -
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…
... you intend on doing the issue 3B power mod ?
i intend on ... 5/12 volts so no power circuit .. and either a lower ... -
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…
... PCB socket (mounted on an issue 3 board) is not the ... you intend on doing the issue 3B power mod ?[/quote]
I do ... last Sinclair recommended version. The issue 3B PCB does not include this ... -
Issue 3 /3b power rail improvements<!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:AllowPNG/> </o:OfficeDocumentSettings> </xml><![endif]--> <p class="MsoNormal">Hi F…
... odd issue 3 and 3b’s with added components
to the power ... /> The changes must improve to power rails around the pcb and ... will be?I have an issue 3 I trying to get ... -
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…
... a damaged Sinclair ZX Spectrum, issue 3B.
According to the maintenance ... can use a regular PC power supply for the Sinclair and ... discard the power supply parts. Has anyone done ... -
issue 6a faultyHi All I got issue 6a pcb from ebay with status faulty pcb had bad voltages when I power up I changed tr4 ztx650 and all voltages got back on ic6 I h…
Hi All
I got issue 6a pcb from ebay with ... had bad voltages when I power up
I changed tr4 ... chips I got from working issue 3b board
any suggestions ... -
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 : …
... /> I have an issue 3 board with an odd power problem, I ... the inductor from another (scrap) Issue 3 board, but still no ... , though comparing to another (working) Issue 3, it does seem to ... -
Issue 3B suddenly goes black and whiteAnother 3B I have here had a faulty ULA, swapped that out for another and hurrah! Works! New keyboard membrane and composite mod later I load a game…
Another 3B I have here had a ... -checked the mod, tested the power supply, power socket, regulator, LM1889 (on ... -
'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
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[LIST]
[*]The standard power socket (replaced with a square ... the ULA chip in an Issue 3b or Issue 6a board, or would ... -
ZX Spectrum Issue 2 - 12V badHey there, I'm currently attempting to fix a ZX Spectrum issue 2 that I recieved. Overall the machine was generally working when I recieved it, bu…
... to fix a ZX Spectrum issue 2 that I recieved.
power a different Spectrum - Issue 3B IIRC), using a ... -
Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…
... have in some places in power supply area on matherboard for ... of resistors. That mainboard is issue 3B but it was upgraded to ... . I have checked that with schematic for issue 5.
regards ... -
Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…
... ) is often caused by power supply fluctuations. But here ... capacitors for the inverter/converter power supply section (see list ... on some boards, the power supply section may have had ... space permitting)
Issue 3B schematic
C5 1uF ceramic
48k one dead, one dodgyhello everyone. I have 2 48k spectrum +'s (the one with the QL case). Both boards have issue 3B on them near the speaker. The first will power up …
... issue 3B on them near the speaker.
The first will power ... . This one will not even power up, it makes a noise ...problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... on my other working sinclair issue 3b without rom i get this ... .jpg[/url] - not working sinclair issue 6a
[url]http://217 ... /11.jpg[/url] - working sinclair issue 3bLow speaker volume on a repaired issue two speccyI repaired an issue two speccy which was totally wrecked and missing many parts. I installed the missing parts (resistors, transistors) and replaced …
I repaired an issue two speccy which was totally ... according to the modification for issue two pcb (for better cirquit ... that i removed from an issue 3b board that i have for ... such)?
On another working issue two that i have, the ...Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…
... (issue 3B board) in a pretty bad condition. I believe the power supply ... have managed to repair the power supply and from what I ...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 …
Hi All,
Is there someone who may explain what these jumpers can be used for.
[url]http://forest.no-ip.org/repair/jumpers.gif[/url]Help with broken SpectrumHi There, Just received a ZX Spectrum computer. It's an issue 3B (48k version). When I power it up (9V centre pin -V) nothing happens. It's complete…
... . It's an issue 3B (48k version).
When I power it up ...Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... left to right, with the power socket to the right of ... />
BTW It's an Issue 3B motherboard, looks quite tidy and ...
