-
Whats wrong with my spectrum 48 kWhen i startup, instead of copyright messsage i get gray screen with black square in middle.
... be a RAM power supply fault - namely the -5v supply supplied ... whispering buzz that the little coil (in the invertor circuit) makes ... -
Ecstasy & AgonyWhile checking out the area around Chennai Central station on Sunday, I came across this crowded narrow road taken up entirely by roadside vendors se…
... you can here the little coil buzzing away, then it's ... on and see if the fault is affected - quite often a ... -
The state of the UK charts.. DisgracefulJust looked at the current UK music top 10. 1. Take That - 'Patience' 2. Booty Luv - 'Boogie 2nite' 3. Akon ft Eminem - 'Smack That' 4. Lazy Town - …
[QUOTE=Spector]But whose fault is that? If you want ... , bands like Rammstein or Lacuna Coil would NEVER have a chance ... -
48K Speccy not workingHey, A few months ago (hope it´s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…
... it's 80% PSU's fault.
If your PSU really ... the resistance of primary transformer coil (put your multimeter in ohm ... voltage on a secondary transformer coil. There should be 9V or ... -
48K Speccy not workingHey, A few months ago (hope it´s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…
... it's 80% PSU's fault.
If your PSU really ... the resistance of primary transformer coil (put your multimeter in ohm ... voltage on a secondary transformer coil. There should be 9V or ... -
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…
If the only fault is lower RAM, it's ... not inconceivable if the original fault was severe enough to blow ... 7805 and blow up the coil, that it's done some ... original destructive event to the coil (the TMS4116 datasheet states 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…
... not inconceivable if the original fault was severe enough to blow ... 7805 and blow up the coil, that it's done some ... original destructive event to the coil (the TMS4116 datasheet states the ... -
Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
... is working (this is the coil that makes the slight hissing ... it has an upper memory fault).
As an aside ... -
Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…
... trying to cure the other fault was the regulator heatsink touched ... smoke came up from the coil! :cry: altho it seemed to ... of the outputs on the coil?
Could you send ... -
Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…
... trying to cure the other fault was the regulator heatsink touched ... smoke came up from the coil! :cry: altho it seemed to ... of the outputs on the coil?
Could you send ... babee, ther smoke from the coil bist? Argh, tha tells I ... -
Composite Video output problemHi everyone, I?ve got a problem that?s really bugging me. I have one Spectrum 48K and one Spectrum +3, both with Composite Video output modification…
... uses a bizarre oscillator and coil arrangement to derive +12V and ... is the chip thats at fault).
-- Richard -
Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…
... being the one causing the fault...
In my case ... without success, finally the deamn coil (that passed every continuity and ... me out finding the (cursed) fault, out of the goodness of ... -
BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…
... />
Sometimes the inductor coil develops a fault, but that isn't ... -
Intermittent sound cutting outHello, I'm resurrecting an old rubber key spectrum. Originally it had no sound at all, diode D9 was blown, I replaced it with one from my other dead …
... be bad or maybe the coil is getting stuck at random ... I knew about the D9 fault, so I took it out ... -
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…
... made by the small transformer (coil) that forms part of the ... well made transformer or a fault in this part of the ... -
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…
... 4116 chips around, but the fault appears in the same place ... /> One other thing with this fault is that if you look ... .
2. The second fault has only happened a few ... occured the buzzing from the coil has changed pitch and "?" symbols ... -
ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…
... gun and start unwinding the coil, I have some questions. From ... be able to help to fault find in a logical way ... well as a short circuit coil, any other short circuit or ... -
One more grey +2 with video problemsI guess I need your help again to hopefully be able to do some proper troubleshooting myself one day. Here I have a grey +2, which could be a bottom…
... there's something else at fault that caused the new TR9 ... legs of C22). Then, measure coil T1, not only for continuity ... -
One more grey +2 with video problemsI guess I need your help again to hopefully be able to do some proper troubleshooting myself one day. Here I have a grey +2, which could be a bottom…
... voltage is applied to the coil that forms the primary winding ... current is induced into the coil of wire that forms the ... a short circuit fault between different (parts of) the coil (winding) of ... -
'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…
... , a burning smell appeared, the coil buzzing stopped and the speccy ... if this is the original fault manifesting itself or something else ... -
'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…
... either TR4 died, or the coil died.
It's ... like dry joints) as this fault will also result in a ... -
Toaster grey screenIv just fired up my toaster and it has a grey screen. I can still see the menu which still works ok. It looks as if someone has painted the front of …
... indicates a potential fault with TR8/TR9, the coil or other components ... -
Dead 48k and +2I have a couple of questions. My old 48k had a very wobbly power socket so bought a new one and soldered it on. It will not work at all now? Is ther…
... which is important for basic fault finding.
As with ... buy an old analogue / moving coil needle type.
A ... most important range / function for fault finding is the 20V DC ... -
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…
... decided to change the regulator coil, as it was getting hot ... problem of c50 and the coil getting hot. Now I had ... one ic and get a fault in another bank. Finally found ... -
Toastrack - faint monochrome displayHi all, I've got a Toastrack with a video issue on both RGB and RF. I get a faint monochrome screen: on one LCD display it is predominately white,…
The coil will show up as a ... if BOTH windings on the coil were shorted to each other ... seeing if that clears the fault. This part is only used ... -
ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …
... due to 9 volt power fault
Re 9 volt ... . I am tempted to replace coil and see if that fixes ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... and C34?) near the coil at the top RHS of ... other new ones but the fault ramain the same . So ... annoyingly I have introduced a fault . I have seen this ... . Does anyone know the likely fault.
What ... /search?q=zx+spectrum+fault+blue+and+white+and+ ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... are:-
1) The fault occurred after just 2 capacitors ... replaced (the ones near the coil)
2) It gives ... image of the "ROM failure" fault (so as faults go "its ... was wrong and created a fault that has stayed .
48k Issue 6a Very sick indeed.Hi Guys. I have a 48k Issue 6a board that shows a white screen with grey border. The white screen has three black squares spaced equally on the le…
... hear any whine from the coil.[/quote]
The lack of ... normal operating frequency, so the "coil" is not being pulsed with ... these two supplies are the "coil" (actually a small transformer), TR4 ... " DRAM chips as well while fault finding) power up again and ...help with issue 3 48k speccy after recap and new tr4 and tr5I have a 48K speccy that was not working. After recapping and replacing TR4 and TR5 it came back to life However after a short while running weird …
... .
TR4, TR5, the coil (actually a transformer) and associated ... quickest and easiest way of fault finding suspect RAM problems, is ...
