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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 …
... won't be necessary to replace the tr4 each time you ... you'll immediately hear the coil buzzing, if you don't ... -
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 …
... ! the expected bzzzzzzz from the coil started! and tr4 remained cool ... of the remaining until i replace the others. Maybe it?s ... better to just replace them all ?
The ... -
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…
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I also tested the coil. On a friends working zx ... got the -5v on his coil. On mine it is producing ... assuming first things to replace would be the coil and TR4/5 ... -
Trying to fix Spectrum Issue TwoHello everybody, I bought from eBay three Spectrums - one is Issue Two and the other two are Issue 3. The Issues 3s look like they are working but t…
... got 4.38v and the coil is buzzing. The +12v is ... low? Maybe because of the coil? Should I put some Super ... Glue to fix the coil or is better to replace it? -
Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
Yes, basically the whole oscillator / coil / charge pump section (shown next ... touching any decoupling capacitors: better replace 22nF with ~100nF ceramic, and ... -
2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…
... now, I only hear the coil buzzing if I put my ... almost against it! May the coil be damaged or something?
replace them, but I notice that ... 've bought the EPROM to replace the damaged ROM, but where ... -
Guide price for a 48k rubberkeys from you lot?My trusty Spectrum (an Issue 3, working since late 1983 or early 1984) has finally upped and carked on me :-( Now I could hit ebay or the local boot…
... the ROM, the CPU, the coil, the keyboard membrane and of ... you don't want to replace the component because of expense ... -
Guide price for a 48k rubberkeys from you lot?My trusty Spectrum (an Issue 3, working since late 1983 or early 1984) has finally upped and carked on me :-( Now I could hit ebay or the local boot…
... the ROM, the CPU, the coil, the keyboard membrane and of ... you don't want to replace the component because of expense ... -
Guide price for a 48k rubberkeys from you lot?My trusty Spectrum (an Issue 3, working since late 1983 or early 1984) has finally upped and carked on me :-( Now I could hit ebay or the local boot…
... the ROM, the CPU, the coil, the keyboard membrane and of ... you don't want to replace the component because of expense ... -
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…
... ok. Both windings of the coil must be conducting, because otherwise ... shortcutted winding of the transformer (=Coil).
I know that ... do a test with another Coil.
The electrolitic caps ... the power cirquit I can replace, its easier than testing them ... -
Toastrack troubleI just received a toastrack off ebay that someone had bizarrely removed the modulator, no matter, ill go through RGB and replace that at some point, …
... , ill go through RGB and replace that at some point, anyway ... post outside the UK.
Replace the ZTX650 transistor (i think ... the right of the small coil, tr4 if i remember correctly ... -
Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…
... .
[*]Shortened turns in the coil, such that the voltage swing ... 'd just go ahead & replace TR4, TR5 and electrolytic caps ... -
'screw' in modulatorI had 'used a metal screwdriver on it' (to quote the guesser from other thread) and broke it. what is the replacement part? are there plastic screwdr…
... , but I would need to replace whole part as the plastic ... it? it looks like variable coil to me. or is it ... -
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…
... /> If you haven't yet, replace the electrolytic capacitors that are ... converter circuit (I'd just replace all that are on the ... .
Sometimes the inductor coil develops a fault, but that ... -
Help changing TR4 and TR5Hi all! Please, help me! :) I think I'm not understanding the correct pins of TR4/TR5 and the transistors. So, if anyone know the correct pins, help …
... again. :(
I need to replace the eletrolytic capacitors...[/QUOTE]
coil makes TR5 pull the brake ... -
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 ... board, I'd need to replace it with something random. Is ... -
TR4 continues blowing up!The TR4 of my Speccy Issue 3 continues burning even after I changed all electrolytic capacitors and the BA157 diode. If these things serve only to h…
... also test (and perhaps replace to maker certain) TR5.< ... measure across the two coil windings. You can do ... a short between the coil's windings. In that ... case, remove the coil make the measurement again. It ... possible one of the coil windings has gone short ... -
Yet another glitchy graphics 48kHeyo, I'm new both to the forums (sorry if this is the wrong forum) and to Spectra I'm afraid, picked up a 48k from a steam fair sale thingy (not th…
... . Now it'll turn on, coil hum and spew out some ... call are check the voltages, replace any capacitor that looks remotely ... -
Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …
... be to desolder, clean and replace the Molex clamps for the ... ULA and used it to replace a suspect ULA in my ... my time to test and replace everything necessary for it to ... the work on the TR4, coil and voltage regulator for any ... -
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…
... occured the buzzing from the coil has changed pitch and "?" symbols ... . Recall that I had to replace C8 due to snapping off ... -
Toastrack trouble[IMG]http://i44.tinypic.com/11lq7id.jpg[/IMG] Sorry about the picture size, cant figure out how to make it smaller! Anyway, the pic says it all, th…
... rightly.
Look to replace the ZTX213/ZTX650 on the ... of the board near the coil. [URL="http://mutantcaterpillar.wordpress.com ... only kicking out 4.5v - replace that too.
B -
Spectrum Missing -5vMy Spectrum is "almost" booting, just when you expect the (C) 1982 Sinclair Research to appear it just displays flashing squares on the screen :( I …
... , the ZTX650 and ZTX213. I replace them with ZTX653 and BC213 ... manual actually recommends switching the coil out as well but that ... -
48k Missing D15Got a 48k here that is missing D15 (just below right molex connector), someone removed it in the past, only just noticed it was gone after replacing …
... two diodes above TR5
- replace TR4
- Do Zorn's ... this fails try replacing the coil
- Start removing 4116's ... -
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…
... & TR5 and the inductor coil. Replace any components found to be ... faulty.
- Replace all electrolytic capacitors.
C46 Capacitor MarkingHi all I've just watched this part of this video: [url]http://www.youtube.com/watch?v=TeCVt2T-YSo&t=17m0s[/url] And he says the marking is incorrec…
... a section of wire to replace the damaged PCB track. Thin ... used into a very small coil to hold the leg and ...48k - Why Won't it Buzzzz?Hi WOS ;) I bought a load of Spectrum games off eBay and thrown in for good measure was a 48k 1984 Issue 6a circuit board that I was told was for sp…
... for what to test or replace. Any suggestions?[/QUOTE]
But be careful: if the coil was damaged, this may be ... lower DRAM's, replace that DRAM and then, replace TR4 and power ...48k - Why Won't it Buzzzz?Hi WOS ;) I bought a load of Spectrum games off eBay and thrown in for good measure was a 48k 1984 Issue 6a circuit board that I was told was for sp…
... coil. Use a ZTX 650/1/2 for tr4.
Replace ...'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…
... circuit (TR4, TR5 and the coil).
What I would do ... R-7805-1.0 to replace the 7805
[*]Fit a ...48k Spectrum "Jail Bars" Removal?Hi all Just curious I think I saw a post here about the bars that go down the screen on some 48k's I think he referred to them as "jail bars". Any…
... , this helped much:
- Replace ALL electrolytic caps. (or check ... with ESR meter, at least replace all with ESR > 0 ... and connect a 220 uH coil between R62 and board. (improves ... to PAL encoder)
- Replace C1-C8 (lower 16k decoupling ...48k Spectrum "Jail Bars" Removal?Hi all Just curious I think I saw a post here about the bars that go down the screen on some 48k's I think he referred to them as "jail bars". Any…
... board, only changes were to replace C5-C8 with 1uf multilayer ... try is Tuukka's 220uH coil mod to filter the LM1889 ...
