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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…
... i powered it on the ztx650 gave up smoke and died ... /> I replaced the ZTX650 and ZTX213 but the ztx650 keeps dieing immediately ... -
BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…
... do is to change TR4 ZTX650?
Would I be ... -
Grey +2 video output and oddities.I've been experimenting with one of the above that I acquired years ago, but had just been buried at the back of a cupboard. I've connected it up to…
... now output too.
TR1 also seems to be installed ... -
128K heatsink no color in composite video and bad antenna outputI am currently repairing a ZX Spectrum 128K heatsink model. It gives no colors on composite video output, and very bad antenna output. I opened it a…
... no 12V.
Replacing the ZTX650 did the job; 12V was ... -
Modulator oddness - previous owner's mod?Hello, just bought a rubber key 48k Issue 3 I'm trying to fix up. I'm wanting to do a composite video out mod ( n00b at this) but the "spare" hole in…
... of the second resistor above TR1 , and the other end goes ... -
Spectrum +2 gray strong noise at TV sound outputWhat could be the reason of strong sound noise at TV channel on gray +2? In the beginning this speccy was dead, it had faulty 78S05 and ZTX650. Added…
... , it had faulty 78S05 and ZTX650.
Added new 78S05 and ... instead of ZTX650 soldered 2SD1207.
After that ... SD1207 after soldering instead of ZTX650 (twisted legs on 2SD1207 because ... -
48K and wavy lines.It seems all Spectrum related things are breaking here at casa de Don Pedro. After the problem with my old ZX81, I went over to my issue 2 ZX Spectru…
... X2
3) Check/change TR1 and/or TR2
4 ... ? I checked the voltages at TR1 and TR2 and believe they ... -
strange solution with bad spectrum +2 t.v. sound2 weeks ago I bought a British 128 K ZX-Spectrum +2. At first it didn't have sound on the t.v. RF output. Adjusting L5 (IC 11: MC1376 audio modulato…
... (TEA2000) and connecting C31 to TR1 and R4 greatly reduced that ... -
Replacing ZTX650 with BD139Today I blew up one of the GALs on one of my DivIDEs while testing on my Toastrack. Shorted M1 with 12V and the 12V circuit broke. I had to replace T…
Today I blew up one of the GALs on one of my DivIDEs while testing on my Toastrack.
Shorted M1 with 12V and the 12V circuit broke.
I had to replace TR4
First transistor I tried was a BC547, computer working again, but the BC547 became hot ... -
Spectrum +2 grey 12v railHello everyone, I have this grey +2 with no video from tv. After much reading and testing i realized it was the internal power supply. At the 12v ra…
... instead of 12. Replaced TR9-ztx650 with ztx653 and TR8-ztx213 ... -
Lot's of ZX Spectrum parts: RAM chips, ULA's, etcI have new stock of 100% tested parts. I even got my hands on a bunch of ULA's!! [IMG]http://benophetinternet.nl/hobby/sales/parts/IMG_6068.JPG[/IMG…
...
- Transistors: replacements for ZTX213, ZTX650
- Coils, power sockets, etc ... -
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 ... -
ZX SPECTRUM 48K color problemsHello, I am asking for your help... I found a ZX spectrum in a garage of a friend. He gave it to me telling that it didn't work. To say the truth it…
... the following problems:
TR1 and TR2 transistor ( I replaced ... -
Spectrum 128 +2 greyhi all, nice to be here, i am trying to reborn my spectrum and i need some help please, i get a new 79s05 to replace, also a bc307 to replace the…
... a bc489 to replace the ztx650
i did some ... -
March offers: lot's of parts!!!I have PLENTY parts available like a lot of 4164 ram chips. I even got some rare spare parts like ZX Spectrum issue two ULA's. - Logic chips: 74LSXX…
... )
- Transistors: replacements for ZTX213, ZTX650 (new)
[B]0.5 ... -
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…
... pin 4 and emitter or TR1 (to keep audio on RF ... -
another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…
... 12V aren't present... the ZTX650 was dead...
The ... order a replacement for the ZTX650 and some 4164 but in ... -
TR1 and TR2 replacementCan anyone tell me the correct replacement part for these? This is for an Issue 4S btw
Can anyone tell me the correct replacement part for these? This is for an Issue 4S btw -
Pimping an Issue 4SSo theres this 4S I have, its been a pain in the backside for ages, this and that going wrong then I stupidly broke it properly by inserting a keyles…
... and heatsink, new transistors in TR1 and TR2 (may do the ... -
ZX Spectrum Pre-regulator DesignCarrying on from the "[URL="http://www.worldofspectrum.org/forums/showthread.php?t=44486"]Issue 2 crashes after about 30 mins[/URL]" thread... [QUOT…
... 5mm standard green LED
TR1 .... NPN power transistor, IC max ... 81-0710
Heatsink for TR1
R1 ....... 68 ohms 1 ... -
August sales[COLOR="Blue"]I have about everything listed here in stock. But some of it must be made ready (with custom wishes). [B]Buying directly will save you…
prob with my grey +2went to turn it on today and am greeted with a black screen with small coloured blocks and a white border and nothing else can someone point me in t…
... />
I have tested the ztx650 and that seems to work ...Ben Versteeg's September sales[COLOR="Blue"][B][SIZE="6"]Add-ons[/SIZE][/B][/COLOR] [IMG]http://benophetinternet.nl/hobby/vanmezelf/sales/line.jpg[/IMG] [IMG]http://benophetinter…
Issue 4S display improvementsHi all, I'd noticed that the display (via modded composite out) of the Issue 4S I repaired a while back (details [URL="http://www.worldofspectrum.or…
... a little further.
TR1 and TR2 weren't ZTX313 ...Ben Versteeg's November sales[COLOR="Blue"][B][SIZE="6"]Almost ready[/SIZE][/B][/COLOR] [IMG]http://benophetinternet.nl/hobby/vanmezelf/sales/line.jpg[/IMG] [IMG]http://benophet…
Issue 6A "scratchy" pictureSo I composite modded a 6A I have here, pictures ok but on some colours its not great, wavy lines in the border etc. What ive tried so far is repla…
... new caps and also replace TR1 and TR2 (ZTX313) with new ...Which ULA to fit in which issue SpectrumI spent a little while studying the resistor changes on page 30 of the ZX Spectrum 48K service manual. They all concern aspects of the video circuit …
... look at the resistor below TR1 and TR2 in the video ... amplifier / inverter made out of TR1. 8K2 for 5C112E, 10K for ...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…
... ceramic caps and also changed TR1/TR2 with BC547's, yet ...TR4/TR5 replacementHi guys, I've got another Spectrum I'm working on now - an Issue 4S this time. When I originally got it, I powered it up and did the basic tests a…
... 've since replaced TR4 (marked ZTX650) with a new ZTX651 and ...No display on a 128 toastrackHi All, I just bought a 128k off ebay with the usual, "it worked last time I used it", so I read into this "it does not work". True enough, it does n…
... that it could be the ZTX650 or ZTX213 transistors at fault ...
