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48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... value. I have also replaced TR4, TR5 and removed all the 4116 ... -
Spectrum+ Noisey Picture ProblemHi fellow Spec-chums I need your help! I've recently brought a 48K+ Spectrum(issue 6A) that I'm trying to repair. I did all initial tests on it prio…
Good to get some feedback after a successful repair. I learned something new today, after my recent video signal experience with TR4/TR5. Thanks! -
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 …
... out the voltage regulator, TR4 and Coil on the issue 2, which ... -
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…
... =gtsamour;674982]If all three TR4, TR5 and TR7 transistors were wrongly ... reverse by amstrad (except just tr4), why didn't anyone else ... only info about fixing the tr4....[/QUOTE]
I've ... -
Spectrum +2 Cable Nightmare -TTL-Composite-RGB ???Just got myself a Spectrum+2 Grey model with rgb scart cable The system works great on my livingroom lcd with the supplied cable, so good news here …
... get your soldering iron out. TR4, TR5 and TR7 are all the ... way around. If you turn TR4 (next to the modulator, right ... -
Another broken SpeccyHi all I have been given another ZX Spectrum, this time it has a really odd problem as you can see in the video: [URL="http://youtu.be/ZOSiBEYQD7w"…
... likely one or both of TR4/TR5 have died and perhaps one ... -
Issue 4A black paper, white borderJust had one of these through, nice yellow pcb! Everything but the ULA soldered in. On power up I get black paper, white border and some intermitten…
I'd replace all of the electrolytics first, then see where the voltages are before looking at TR4/TR5.
B -
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…
... is how a 4116-induced TR4 failure managed to kill the ... turned pin sockets for TR4/TR5 so swapping out TR4 took seconds :)
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…
... is how a 4116-induced TR4 failure managed to kill the ... turned pin sockets for TR4/TR5 so swapping out TR4 took seconds :)
Some problems with 2 ZX Specturm board'sHi, last week i got some ZX Spectrum stuff. Also 2 ZX Spectrum 48K's, one in the orginal case the anoter one in a DK'tronixs case. Both have problem'…
... 9).
Usually replacing TR4 (ZTX650) with a ZTX651/2 ... ) that is usually measured when TR4 is blown.
3 ... spot-on, which means that TR4-TR5 circuitry is working somehow, otherwise ...Using a Euro Sinclair PSU in UKI've got a EURO1400 PSU with a Euro plug. Am I right in thinking I can just cut the pug off and change it to a UK plug, and it will work fine? The on…
... which caused
the internal TR4/TR5 circuit to stop working. The ...+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…
Nope, remember that TR4/TR5 on the grey +2 are ... perform very different functionality to TR4/TR5 in the 48K models :) (TR8 ... be used to replace both TR4 and TR5, I think the collector ...+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…
... AMSTRAD has the silkscreen for TR4, TR5 and TR7 (all type 2N3904 ... .1 has the silkscreen for TR4, TR5 and TR7 printed correctly. So ...+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…
For a[B] Z70500 ISS3[/B] board, fit replacement BC547/BC548/BC549 transistors exactly as per the silkscreen for TR4, TR5 and TR7 positions.
[I][B]Mark[/B][/I]+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…
... the two "anchors"
8. TR4, TR5 and disconnected the audio from ...PSU Overvoltage?Going through a pile of 48k PSU's today, rewiring and fitting new plugs, testing each one as I go I came across one that outputs 14.85v, usually im g…
... load which caused the internal TR4/TR5 circuit to stop working. The ...Another "untested" dead spectrum...Hi, I'm looking for some suggestions on a faulty Spectrum I have picked up. I'll need to wait until tomorrow before posting pics, but the screen is …
... next.[/QUOTE]
TR4 & TR5 will be in working order ...TR4 or TR5?My issue two gives horizontal bars on bootup. Flicking reset takes it to copyright screen though. I measured voltages and got 4,9V, 11,99V and -4,3V.…
I'll second Mark's suggestion - I've seen boards producing out of tolerance -5V, capacitor replacement will sort this out.
In my experience TR4/TR5 are either 100% alive or 100% dead :)
BTR4 or TR5?My issue two gives horizontal bars on bootup. Flicking reset takes it to copyright screen though. I measured voltages and got 4,9V, 11,99V and -4,3V.…
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…
... , reinstall a new/known good TR4/TR5 but [B]do not power ... culprit of a continually blowing TR4 in your case is a ...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…
... , reinstall a new/known good TR4/TR5 but [B]do not power ... culprit of a continually blowing TR4 in your case is a ...AAAARRRRR DIV-MMC ENJOY againIve recently been posting trying to get to the bottom of problems with my +48 not working with this rechid addon.Now ive finaly worked out theres not…
... this creates.
Regarding TR4/TR5, they are the same components ...AAAARRRRR DIV-MMC ENJOY againIve recently been posting trying to get to the bottom of problems with my +48 not working with this rechid addon.Now ive finaly worked out theres not…
... components,will they be labeled TR4 TR5 or can i just use ...Toastrack ULA QuestionDid any of the toastracks have the +128 grey ula with Amstrad printed on them?
Thats why i was asking was thinking about spares but it could have same problem as mine at the moment. Do you think TR4 TR5?(THE ONE ON EBAY)ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
Really?
Ok I will change two transistors at TR4 & TR5 then try it again. Then start removing the ram chips I guess.ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
... get the electrolytic capacitors and TR4/TR5 changed you should have voltages ...ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
... fry the lower ram if TR4/TR5 blow up.
If ...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 …
... highly recommended, as failure of TR4/TR5 will be a much more ...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 …
... components that could die are TR4/TR5 and there's nothing left ...'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…
Missing TR4/TR5 too. Looks like it was modded to take an external ATX like supply providing +5v/-5v/+12v directly to the required rails.
B
