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Issue 4S washed out pictureEvery single one of these ive had has a washed out display, no where near as crisp as the other issues ive had, Samsung did something there that has …
Had a look and the trace looks to go topside.
Buzz it out with a multimeter, you'll know straight away then if the connection between TR1 base and the right side of R48 is good...
B -
ZX48 svideo modI have modded a ZX48 to have svideo output. The end of C65 that goes to TR2 (its an Issue 2 zx 48 ) has been lifted to get Chroma. Luma is taken fro…
... voltage inverter circuit comprising R51, TR1 and R52. R51 is 2K2 ... -
New Spectrum User - Inveterate UpgraderI've been asking a few questions about my Speccy, which is the first I've owned despite my advancingh years. I was a C64 kid, but please don't hold …
... lurking about, so might give TR1 & 2 a spruce up ... -
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…
... i think there are more TR1 TR2 for example and thank ... -
New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…
... did not touch R51 or TR1, instead I cut two tracks ... -
Grey +2 no soundThis will only produce sound from the sound socket at the rear both loading and game sound are fine through my amplified speakers but when I unplug t…
... going to reconnect it to TR1 but thought at the time ... -
New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…
... voltage amplifier made out of TR1 which amplifies and inverts the ... filter on the output of TR1 because it would also filter ... have to put it before TR1, or separate the output of ... TR1 and the chrominance signal, notch ... -
Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…
[QUOTE=balford;790240]Have TR1/TR2 been replaced? They're ... />
I have changed both TR1 and TR2 with a couple ... -
48K misplaced coloursHello to everybody! Slowly recapping a otherwise working Issue 6A 48K. All new caps aroud LM1889, 7805 and DC-DC converter, which improved ripple an…
... machines, due to substitution of TR1/TR2 for locally sourced equivalents ... -
Post Composite mod video not bright enough - FIXHiall, I have a few Spectrums and decided to modify them all with the composite video mod, i.e. redirect the feed to the modulator direct to the out…
... diagnosing I'd changed both TR1 and TR2 for 2N3904's ... -
Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…
... mind) was due to changing TR1 and TR2 for 2N3904's ... -
Issue 4s - Not 'Jailbars' but lines alloverIt's not another 'Jailbars' question!, but I've got this Issue 4S that aside from the 'Jailbars' on the Paper area of the screen which I can live wit…
... the video circuitry (apart from TR1/TR2 because I already changed ... -
Post Composite mod video not bright enough - FIXHiall, I have a few Spectrums and decided to modify them all with the composite video mod, i.e. redirect the feed to the modulator direct to the out…
Incidentally, changing the 2N3904 on the Spectrum +2 for a BF199 could yeld a better image on CVBS?
And what about the TR1, TR2 (,TR3) transistors? Any room for improvement? -
Dodgey R62 / D16 on Issue 2?Hello all, I am still beavering away trying to work out why my Issue 2 fails and after a much closer visual inspection I noticed what looks like som…
... ?
BC 549 C = TR1, TR2, TR3, TR6, TR8, TR9 ... -
Dodgey R62 / D16 on Issue 2?Hello all, I am still beavering away trying to work out why my Issue 2 fails and after a much closer visual inspection I noticed what looks like som…
... :
BC 549 C = TR1, TR2, TR3, TR6, TR8, TR9 ... -
Guess the video faultI've two dead flesh Spectrums, one a 16K issue 2 outputting white with a tinge of blue (not as extreme as photo shows) with two pink horizontal lines…
... . I soldered the wire near TR1 and the other end on ... -
Video ZX Spectrum+ 48k<span>Good day ... is a bit of time that I try to fix my zx spectrum ... I replaced the ram 4116, all electrolytic capacitors ... but the monitor loo…
looking at the schematics, I can not convince me that the ULA is the problem, I saw that the video output is controlled by lm1889 ... and later by tr1 and tr2 ... I will do some testing ... -
Video ZX Spectrum+ 48k<span>Good day ... is a bit of time that I try to fix my zx spectrum ... I replaced the ram 4116, all electrolytic capacitors ... but the monitor loo…
... ) and the surrounding circuitry (including TR1 and TR2) convert the colour ... -
Video ZX Spectrum+ 48k<span>Good day ... is a bit of time that I try to fix my zx spectrum ... I replaced the ram 4116, all electrolytic capacitors ... but the monitor loo…
... replaced the electrolytic capacitors and tr1 and tr2, as tr2 seemed ... -
Whites are yellow - 48k Issue 2I have a 48k issue 2 that appears to be working fine. I've replaced all but 2 of the electrolytic caps (mostly because the 2 were not in stock at my…
... />
I incorrectly stated that TR1 and 2 are trimmers - I ... -
Video Problem - Spectrum 48kYet again I come seeking help.... Can anyone point me in the direction of anything that explains the video generation circuit on the Spectrum? I'v…
... common emitter inverter circuit like TR1 on the ZX Spectrum board ... -
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…
... 4 and the emitter of TR1. This means that audio is ... -
New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…
... the signal that goes from TR1 to TR2 and make the ... I cut the feed from TR1 to TR2). -
Shimmering displayHi all, I've got a 48K issue 4S and it appears to be working apart from it's displaying weird vertical shimmering patterns. It passes a RAM test t…
... a check over again of TR1,2,8 and 9 and ... -
Repair Zx Spectrum +2 Blackhello there, just found a Zx Spectrum +2 Black edition Issue 1 board that doesnt appear anything on the screen, even led dont power on,i have tes…
It might also be worth removing TR1-TR3 as they could all be damaged.. however if you leave L3 and L4 out of circuit, this does remove power from the damaged circuitry. It's possible this is what whoever was originally trying to repair the +2B was doing. -
Repair Zx Spectrum +2 Blackhello there, just found a Zx Spectrum +2 Black edition Issue 1 board that doesnt appear anything on the screen, even led dont power on,i have tes…
... is to remove and replace tr1-3 in order to check ... -
Repair Zx Spectrum +2 Blackhello there, just found a Zx Spectrum +2 Black edition Issue 1 board that doesnt appear anything on the screen, even led dont power on,i have tes…
... /> There's no point replacing TR1-TR3 at this point if ... -
Spectrum +2 grey RF removalHi everyone. If I were to remove RF output from a +2, just intending to keep Composite video out from TEA2000, then all the components that make t…
... /> I removed the RF modulator, TR1, TR2, TR3, R1, R2, R3 ... -
Repair ZX Spectrum +2 black issue 1Hi all, after a long time i will try to repair a ZX Spectrum +2 black i found the last days i know for sure that CPU is damaged (already repla…
... the RGB socket.
TR1 BC 558 - BC557, BC556, BC559 ...
