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'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…
... mode power supply circuit (TR4, TR5 and the coil etc.).
Also ... the state of TR4, TR5 and the coil. If TR4, TR5 or the coil is faulty ... -
Short Circuit Damage?Hey Spectrum fans, Currently trying to diagnose what is wrong with my 48K Issue 4B ZX Spectrum. The initial problem was the fact it would not boot -…
I always change TR4 and TR5 at the same time, as if one is bad it can take out the other.
The official advice is originally to actually change TR4, TR5 [i]and[/i] the coil, but that may be difficult these days! -
Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …
... voltage inverter formed by TR4, TR5 and the coil, the voltage on +12V ... -
Cooking toastrack... the dreaded smellI powered up my Spectrum 128 (heatsink model) yesterday only to see what looked like an out-of-tune picture on the television. I'm using a scart adap…
... refer to the coil, is that the little coil next to the ... , it's right beside TR4/TR5, and marked 'COIL' in your photo above ... four corner pins of the coil. Test both left hand pins ... -
not working issue 3Hi all, I received this mobo from ebay, after start i have this on screen [img]http://forest.no-ip.org/wos/issue3_01/20150728_135908.jpg[/img] …
... in the voltage converter circuit have failed, though TR4 is by ... the diodes in the voltage converter circuit too.
... new transistor you fitted for TR4 has burnt out, unless ... /> - Check TR4, TR5 and the diodes in the voltage converter circuit.
another non working issue 3 48kHi all, next! :) I don't have good filings about this speccy :) https://youtu.be/D9qpCR18-kI here is short video what this speccy do. we hav…
... , but is the inverter working (TR4 & TR5), or is the +12V ... the secondary winding of the coil?
Other causes of ...Power issues on a 6A 48 K SpectrumHello all! I decided to take another look at my 6A Spectrum that I broke via a bad joystick adapter, I’ve removed the bottom 16K ram and replaced…
Sisce you did change TR4 and TR5 "to no avail", I assume ... power supply section, and specifically TR4, TR5 and coil, are working properly. Stop ...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,…
... difference with new transistors in TR4 & TR5. I put in sockets ... same result applies - TR4 keeps popping and TR5 is unscathed.
I'll look to disassemble the coil ...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…
... whine from the "coil" means that TR4 is not switching on ... are the "coil" (actually a small transformer), TR4 and TR5.
< ... kill TR4. Or kill TR4 and TR5. Or kill TR4, TR5 and the "coil". Also ... the prime suspects are TR4, TR5 and the "coil". Also check all ...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 …
... 't normally die when TR4 and/or TR5 die, as the 7805 ... are off.
TR4, TR5, the coil (actually a transformer) and associated ...Finding a good (UK) external switch mode power supply for the basic 48k and 128k ZX SpectrumsThis idea has probably "done the rounds" by now . I think I have heard about it a bit late . This thread with look at replacing the original "heavy l…
... will be new transistors for TR4, TR5, some new capacitors and a ... regulator (7805 or DC/DC converter).
The new / replacement ... a modern mini DC/DC converter module. Doing this significantly improves ...Modifying a speccy to +5v only operation.Just a thought experiment so far. Let's say i wanted to make a more resilient spectrum by getting rid of the DC-DC converter circuit. This would remo…
... rail once you remove TR4, TR5 and the coil.
That will ...tr1-2-3-4-5hi guys, can someone tell me, what is the exact function of each of the five transistors i have on my zx+3 i mean the black transistors TR1 TR2 TR3 T…
hi guys,
can someone tell me,
what is the exact function of each of the five
transistors i have on my zx+3
i mean the black transistors TR1
TR2 TR3 TR4 TR5,
thanx,ZX Spectrum + Issue 6A Repair attemptHello everybody! I got ZX Spectrum + which doesnt work properly. On power up I can see color mosaic, then paper goes black and i can see thin red ba…
... are good (i replaced LM7805,TR4,TR5), so I suspect upper memory ...ZX Spectrum not working... issue 4S?Hi, I've bought a "new" broken ZX Spectrum +. The idea was to put an harlequin board inside, but for the moment I'm trying to put it in working order…
... I'll try first changing TR4, TR5, C44 and C45 (as suggested ...Issue 3 power problemHi all, I have an issue 3 board with an odd power problem, I have no -5V in fact, measuring the voltage on this line leads to a surprising result : …
... are dead, and have replaced TR4 & TR5, as faulty RAM can ... .
It think the TR4/TR5/L3 circuit must be working ...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 right ...+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!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…
... fine but TR4 was faulty.
I replaced TR4 & TR5 and replaced ...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…
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…
... checked the voltage regulator, TR4 and TR5 and as far as I ... />
I have noticed that TR4, TR5 and C74, C46 are getting ... 45 secs. I checked TR4 and TR5 and they are still ok ...Unresponsive Spectrum with Magenta border.This Spectrum is taking an age for me to repair, thank for all the help thus far! So after I switch on the ZX Spectrum+ I get the familiar white…
... .net/LRR/ along with TR4 & TR5 and for good measure I ...Issue 4A, tests complete fine but get odd crashing problemHi all, I've got an issue 4A which has had all of its lower RAM replaced, TR4, TR5 as well as its CPU. It originally had quite high voltages (20-3…
... of its lower RAM replaced, TR4, TR5 as well as its CPU ... some very questionable RAM. TR4 and TR5 were replaced and with new ...What are the chances?Hi all, I've picked up an issue 3B, fairly clean board, no mods, wasn't starting correctly so I tried Brendan's diagnostic ROM and got this: [i…
... it made no difference. Checked TR4/TR5 and they appear OK. -5 ...Issue 2 48k Yellow DisplayHi guys. As the title says, I have an issue 2 that's displaying the typical yellow/green colour screen at switch on. The picture is clear and stab…
... in the correct polarity.
TR4 TR5 removed, checked tested good, refitted ...Issue 2 48k Yellow DisplayHi guys. As the title says, I have an issue 2 that's displaying the typical yellow/green colour screen at switch on. The picture is clear and stab…
... in the correct polarity.
TR4 TR5 removed, checked tested good, refitted ...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. I ...Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …
... />
Incidentally, anyone looking for TR4/TR5/TR6:
[url="http://www ...Spectrum Issues by Serial?Wotcher all, Just wondering, as I gaze idly at my newly bought off eBay Spectrum+... is there any way of telling from the serial number what issue a…
... voltage fluctuation and boom goes TR4/TR5.
Of course you ...Tomb Raider - LegendSeven and a half hours. Seven and a half bloody hours. Seven hours and a tad over thirty mins TOTAL. Great Graphics. Great Story. A GRAND TOTAL …
... , the TR3, then TR1, then TR4, TR5 I found a waste of ... /> Mind you if you completed TR5 in under 4 hours; probaly ...
