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Giving up on SpectrumsHi all... Bit of a downer post here... I'm really close to giving up on Spectrums.. My 48k has given me nothing but head aches since day one... and …
... - rule #1 - Thou shall check voltages
Is the PSU ... -
Were +2A tape decks badly made?I remember as a kid in the early 90s(must of been as I started Secondary School in 1994 and this was before that) maybe even 88 or 89 I used to play …
... supply to supply several different voltages needed for those models, hence ... -
'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…
... IC's, replace TR4, check voltages, replace TR5 if necessary. Change ... -
Spectrum sometimes boots with graphic issuesA while ago, my Spectrum 48K (issue 3B) broke down after fiddling with a brand new joystick interface in combination with DivIDE. Today I tested the …
Check the voltages of the lower memory, +5v, -5v, +12v. -
'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…
Help with 128k greyHello friends, need some help here on try fixing a +2 grey spectrum128. To keep it short, opened the case and the voltage regulator was missing, the …
... the machine running to check voltages, touching lightly the pin revealed ...Modern PSUHello everyone, I'm looking for a modern PSU for my Spectrums and my dual set of 3.5'' floppy drive+HxC floppy emulator. The one for Spectrum should …
... it to select between different voltages?
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Switch ...Modern PSUHello everyone, I'm looking for a modern PSU for my Spectrums and my dual set of 3.5'' floppy drive+HxC floppy emulator. The one for Spectrum should …
... Spectrum as all the supply voltages are there (+12, +5, -5Vetc ...How important is the 9V line?I'm in the middle of resurrecting an Opus Discovery. The transformer is gone so Im using a small switched mode PSU from a PC. My plan is to bypass …
... feed the board with two voltages, 12 & 5V. Then I ...Pics of your Speccy set-up?Had a look and can't seem to find a thread on this. - Be interesting to see pic(s) of everyone's "go-to" Speccy, the one that they use regulary. I'…
... differences in TVs and power voltages here in the States make ...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 -…
... multimeter on Pin 16, the voltages were:
Pin 1 ...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 -…
... /> After renewing TR4, measure the voltages on one of the 4116 ...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…
... 549 C = TR1, TR2, TR3, TR6, TR8, TR9
ZTX 653 ...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…
... 549 C = TR1, TR2, TR3, TR6, TR8, TR9
ZTX 653 ...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…
... to say "Thou shall test voltages", but you now what? I ...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…
... with a picture of the voltages (Marks?) but I still always ...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…
... diodes (etc)
Test voltages taken at various points from ... information on "Thou shall test voltages" - it's one thing to ...Pics of your Speccy set-up?Had a look and can't seem to find a thread on this. - Be interesting to see pic(s) of everyone's "go-to" Speccy, the one that they use regulary. I'…
... differences in TVs and power voltages here in the States make ...Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
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Also are the supply voltages okay during the "wild" times ...Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
... by side and measure the voltages of each pin on the ...Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
... by side and measure the voltages of each pin on the ...Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
... cause are maybe TR3 or TR6 (both ZTX313).
TR3 ... the resistance range.
TR6 is the extra address decoding ...Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
... , we'll replace 7805, TR3, TR6 and see how it goes ...Problem with ZX Spectrum 128k +2B Tv Output and RGB imageHello, Last week I've been ofered with a ZX Spectrum 128k +2B but I have a problem with the tv out (through RF modulator) .The image is clear on the…
Just the electrolytic (polarised) caps.
First though, I'd try a different PSU if possible, just in case the voltages your PSU are generating might be noisy (due to failed/failing caps).
BWeird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
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Have you changed TR6 already? If this is an ...Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
... border).
Have you changed TR6 already? If this is an ... /> No I've not changed TR6 yet and it is indeed ...Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
Certainly TR6 would be my next candidate ... a DIP-40 chip. :) If TR6 doesn't help, though, that ...Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
... and are not influenced by TR6 (this only corrects overly aggressive ...Sinclair ZX Spectrum 128My loving mum has brought me back one of these beauties from a carboot sale but I'm haven a slight problem with it I CAN'T FIND THE ON SWITCH!!!!!…
... 's plugged in, check the voltages on the left and right ...Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …
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Actual measurements showed me voltages as low as 3V in ...
