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Correction of +2 hardware errorsThis is a collection of various pieces of information picked up from various places, including a lot from this forum. I have edited it and reworded i…
... errors:-[/B][/U]
TR4, TR5 and TR7 (all type ... they work correctly.
TR4 provides the composite video output ... -
128k toastrack with an amstrad ULAI received a 128k toast rack today with an "amstrad" ULA fitted, I'm wondering if this is fairly common or more rare, presumably manufactured after t…
... the main board, and issue 6U
[url]http://cl ... -
Flashing coloured blocks - diagnosisHiya, hope this is the right place for this... Was given an Issue 2 48K by a someone yesterday that hasn't been powered on in 20 years, which works …
... down to the voltage regulator, TR4 transistor, ULA, or RAM. I ... -
Project #1 : Speccy 128k+2 with diVide inside...Hi guys, I just have finished my Super Spectrum #1 The idea (I was thinking of that since 2007) was to fit an english grey +2 motherboard in a +2A…
... out), and to refit the TR4, TR5 and TR7 (2N3904) the ... -
48k Issue 4A power supplyHi, I just repaired a 48k Spectrum+ with an Issue 4A board. The computer worked but the picture was mono with bad contrast and bad synchronizing. I …
... found out that the transistor TR4 was dead. So the transverter ... turns at the collector of TR4 and 41 turns at its ... the transverter works well and TR4 (I use SD350 of GDR ... -
+2 Grey ropey RF[url=http://postimg.org/image/y9s0xc5k5/][img]http://s18.postimg.org/y9s0xc5k5/P180413_13_13.jpg[/img][/url] Re-orientated TR4 as per normal but the …
[url=http://postimg.org/image/y9s0xc5k5/][img]http://s18.postimg.org/y9s0xc5k5/P180413_13_13.jpg[/img][/url]
Re-orientated TR4 as per normal but the RF is awful on this CRT, would it be wise to do TR5 and TR7? Would that improve it any? -
Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…
... come out as expected (including TR4 and 5) but the problem ... -
The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…
... also been replaced, along with TR4 and C46. Something tells me ... -
Issue 4A repair attemptI think I need some help. I have a nice Issue 4A main board here, which does not give out any video signal. I checked some voltages (the ones that se…
... no picture. I also replaced TR4 and TR5, but with the ... -
Video problem on grey +2I have a bad video problem on grey +2. The computer is in a poor shape, but the major problem is with the video. With a (known good) SCART cable I ca…
... my poor knowledge, I replaced TR4, but no change at all ... -
I've had better nights...So I got a broken issue 2 today, case in good nick but the diags board showing multiple failures in both lower/upper RAM. Never mind, good as a spare…
... magic smoke from TR4. Crap.
Replacing TR4 and consigning that ... /> TL;DR: Dodgy 4116 killed TR4, 2 other 4116's and ... -
grey +2 mystery continuesAfter fixing two grey +2 Issue 3 Spectrums, where replacing and turning TR4 solved the RGB signal problems, I came across two more problems with the …
... Spectrums, where replacing and turning TR4 solved the RGB signal problems ... -
Tricky ZX RepairHello guys, This time I put my hands on a very nice Issue 3 16K, upgraded to 48K. To bertter explain "nice", it is absolutely mint, not a scratch on…
... well within limits, no blown TR4 and/or associated paraphernalia. Current ... -
Black Screen Spectrum 48kWas working ok, it came to me in a Fuller FDS keyboard, I had a nose inside and found a floating power lead connected to the keyboard, I removed that…
... />
Went through and checked TR4 and TR5 (all test ok ... -
Interesting 48K failureI thought I'd recount a failure I've not seen mentioned before that I saw tonight while fixing a 48K issue 6 board. The background: The initial fail…
... the 48K board gets shorted. TR4 is usually a casualty, as ... , -5v was now present, so TR4 had actually survived the ordeal ... -
Buzzing Grey +2This is mentioned in another thread but I thought I had best start a new one regarding this. Basically Ive done TR4, put a 5.5k resistor to R38 and …
... .
Basically Ive done TR4, put a 5.5k resistor ... -
+2 Grey video issueSo far ive replaced TR4, TR5 (and correctly orientated them) and seperated the audio from the video, still I have this; [youtube]mZZWOXRs_Zk[/youtube…
So far ive replaced TR4, TR5 (and correctly orientated them) and seperated the audio from the video, still I have this;
[youtube]mZZWOXRs_Zk[/youtube]
I just know im really close with this but unsure how to further proceed! -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... />
I also replaced the TR4 and TR5 then I had ... -
Using VAC PSU in DC deviceHaving fixed the dead Issue 3B, I began to wonder about the PSU that came with it. It was pretty obvious what had killed the poor Spectrum as the PSU…
... with a dead 7805, dead TR4 and TR5, probably dead lower ... -
Grey +2 - no sound during loadingI have a grey +2 here (issue 3), that is acting a bit strangely. I cleaned it and replaced/reversed TR4 to give it a stable RGB signal and so far all…
... cleaned it and replaced/reversed TR4 to give it a stable ... -
Help Me Identify Mystery Speccy PlzI was Given A box of speccy stuff and in it i got a nice surprise it included a really nice spectrum but ive not seen it before its a cross between …
... and it contains a version 6u board but some components are ... -
ZX Spectrum 48K Issue 3, loss of -5V rail.Hi all, I've googled this problem and poured over the electrical diagrams for the circuitry concerning the power supplies and I believe I know what …
... -0.18V. I've changed TR4 and TR5 and these are ... -
ULA type and datecode listHere is a list of all known ULA datecodes with type, collated from various threads and the serial numbers list. For the 6C series ULAs without a -5, …
Spectrum +128 board questiondoes anyone know the order of age I would like to know which is the most recent 6k or 6u
does anyone know the order of age I would like to know which is the most recent 6k or 6u48k - 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…
... thinking along the lines of TR4/TR5 having been blown, so ...Issue 1 oddityHello to everybody, I have a very first under my hands - a broken Issue 1. Apart from the classic "broken lower RAM" syndrome which will be easily t…
... is operative after the obvious TR4 replacement.
Composite signal ...Issue 2 Spectrum - Black screenHi I have an issue 2 spectrum which I'm having some issues with. I bought it on ebay so have no idea of the history or how it came to be broken. Whe…
... 5v Regulator was fine but TR4 was faulty.
I replaced ... TR4 & TR5 and replaced all ...48K No Sound?Repaired a 48K spectrum the other day that had the wrong PSU Plugged into it. Replaced 5v regulator, TR4, TR5 and all Electrolytic Caps. Spectrum th…
... it.
Replaced 5v regulator, TR4, TR5 and all Electrolytic Caps ...I broke my 48k Speccy!!!!Hey guys, I am looking for some advice, I hope you can point me in the right direction. So, I went about replacing all the capacitors on my issue 4…
... /> I checked the voltage regulator, TR4 and TR5 and as far ... />
I have noticed that TR4, TR5 and C74, C46 are ... about 45 secs. I checked TR4 and TR5 and they are ...
