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48k Speccy died, resistors getting too hot to touchHi folks, With 2 days to go till an exhibition my trusty dual-boot 48K issue 3b that I made last year has given up the ghost and I'm not sure I ha…
... side of it get instantly hot but tested out of circuit ... -
128K + Toast Rack getting quite hot?Just wondering something if someone can put my mind at ease After using my 128k for around 10 minutes+ it seems to get quite warm around the heatsin…
... keyboard etc, just wondering how hot does it get which is ... -
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 …
... .
After recapping and replacing TR4 and TR5 it came back ... -
Help request for an injured Issue 4A spectrumHi folks, I'm hoping to resurrect an issue 4A spectrum that has been in my hoard for a couple of decades since buying it for spares. Someone ha…
... know), tested and replaced faulty TR4 TR5 and the 9v regulator ... yet as i'm still hot happy with the power - it ... -
upper ram tacks / TR4 socket...[url="https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7"]https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7[/url] you can only replace that pesky TR4 so many t…
... can only replace that pesky TR4 so many times .... surprises me ... that with TR4 not in place or when ... -
Best replacement for ZTX650?What is the best replacement transistor for the obsolete ZTX650? I've read that TIP31 will do the trick. Is there a decent equivalent from the BC or …
... R62 (15 Ohm) is getting hot, to see if there's ... remove D15 to see if TR4 blows again. This will eliminate ... into the base of TR4, which will open TR4 too much, and ... />
BTW: Is TR5 getting hot as well ?
And ... -
TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…
... not sure.
The tr4 transistor is a BC487 now ... being on, it wasn't hot, just very warm. Warmer than ... of then is getting rather hot while operating.
I ... -
PC Power supply for SpeccyHi all, after 13 years with out playing spectrum games I am eager to play the old games. Thus I got up to the garret checking my old stuff. Two of m…
... Speccies here with the original TR4 etc - working perfectly after 25 ... current - enough to make it hot enough to melt the case ... and cheaper to just replace TR4. If you have to re ... -
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…
... had blown - cos they got hot!
I hardly ever ... replace tr5 - it was always tr4 but you had to fix ... -
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 …
... , replacing just the 7805 and tr4, it just booted ok! i ... , hoping it was just the tr4 but no luck.
Replaced tr4 but the new one started ... another new tr4 (ztx653) and it started to get really hot just ... -
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 …
... 're lucky just before the tr4 is blown, touch all memory ... power and not get immediately hot.
If the bad ... be necessary to replace the tr4 each time you try. If ... it off immediately to prevent tr4 from having to be replaced ... -
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 …
... not a very lucky person :-( . Hot tr4 to the point of burning ... from the coil started! and tr4 remained cool...
The ... -
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…
... i'd replace the TR3, TR4 and 7805 transistor (the big ... the parts on mainboard are hot beside 7805.
Tommorow i ... to get and replace TR3, TR4 and 7805.
Should i ... -
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…
... />
Replacing a transistor like TR4 makes more sense when voltages ... 'good enough'. When you unsolder TR4, chances are it'll die ... (s) that feel [I]very hot[/I].
More detailed ... -
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…
... inside the Speccy (of which TR4 is a part) has died ... ICs out is to use hot air (you may want to ... the PCB etc) with the hot air it won't damage ... -
damaged spectrum+ (blinking squares)Hi, Sorry for my poor english, but I couldn't find on family forums any remedy for my hardware problem with my first speccy in my life :) I've bought…
... on, ULA is warm, not hot, 4116 all are cold. Pictures ... replace. I'll start with TR4.
Why all 4116 DRAMs ... -
damaged spectrum+ (blinking squares)Hi, Sorry for my poor english, but I couldn't find on family forums any remedy for my hardware problem with my first speccy in my life :) I've bought…
... news: finding replacements for TR4, TR5 or 4116 DRAMs ... production transistors that can replace TR4 and TR5, you don' ... The secret is to use hot air rework, it's ... , too.
The hot air method is this.
hot air gun closer. You ... -
Speccy repairs?I've finally got round to testing all the various Spectrums that I seem to have accumulated over the years and discovered that "my" two machines (i.e…
... , I use desoldering braid then hot air. Using the desoldering braid ... Spectrum - and then using 260C hot air gets the remaining solder ... ) needs fixing, it's likely TR4 has died. When this power ... machine. It is very fragile (TR4 blows if you look at ... -
zx spectrum ULAis the ULA in the 16K the same as in the 48K could you take the 16K ULA and place it in a 48K I ask this because i have a speccy thats dogy with th…
... RAM.
Possible cause TR4 of the power circuit blowing ... , and it got very VERY hot. After fixing the problem it ... . You'll have to replace TR4 and the 4116 (I'd ... replace TR4 with a higher amp rated ... -
zx spectrum ULAis the ULA in the 16K the same as in the 48K could you take the 16K ULA and place it in a 48K I ask this because i have a speccy thats dogy with th…
ok, looked at the ram 4116, two of them are realy really hot, the others are only slightly warm. SOMETIMES it works but most times it does not...I looked at TR4 but it seemes to be fine -
Testing 4116 and 4164 chipsI have a stash of old 4116 and 4164 chips and wondered how best to test them to see if they work. I don't have a working spectrum to plug them into …
... ) and see if the get hot, if they do, then they ... my Spectrum is exposed to TR4 being damaged if I test ... -
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…
... on-board voltage conversion circuitry (TR4/TR5 IIRC), but if caused ... ULA is supposed to run hot, but I noticed that the ... -
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…
... touched another one, so the TR4 shorted and died, but I ... felt that the TR5/TR4 where getting hot, so I tried to ... -
+2 grey composite modWithout digging out the schematics, is it possible to do the composite mod like the 48k on these?
... ][/url]
Using my hot-air rework station I removed ... mistake Amstrad made with the TR4 transistor (it is silk screened ... can see in this picture, TR4 is now correct for the ... -
rubber key Spectrum 48k problem :(when i plug the spectrum in all i get is a black screen with a red border and sometimes flashing blocks. the spectrum worked until about 20 mins ago…
... don't get them, change TR4 and TR5, and measure again ... ] otherwise you'll just blow TR4 and TR5 again.
hot (if so, replace it).
hot chips, and all voltages are ... -
Dead Spectrum+Hi! Any suggestions where to start finding what's broken: Spectrum+ with issue 6A motherboard and nothing on TV. Top row of the upper memory chips g…
... circuit somewhere in your board (hot chips for example). Locate the ... , check +12V and -5V. Replace TR4 (ZTX650) if +12V reads about ... not present. If after replacing TR4 you power on the computer ... comes from the newly installed TR4, this means that you have ... -
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…
... other thing if I change TR4 and TR5. Instead ZTX650 I ... in the TIP31. If TR4 get hot then stop the spectrum and ... -
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…
... other thing if I change TR4 and TR5. Instead ZTX650 I ... in the TIP31. If TR4 get hot then stop the spectrum and ... -
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…
... the TIP31 im using gets hot really quickly, the ZTX650 would ... without a tr5 (ztx213) the tr4 doesnt heat up. -
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…
... in other directions. The Tr4 and Tr5 transistors work in ... Tr5 controls the current through Tr4, as a kind of stabilisation ... /> Because the 'dead' current through Tr4 (without the oscillating) is much ... you 'cut' R62 and Tr4 gets still hot (and there is no ...
