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ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…
... = 1.30volts :(
TR8 voltages:
B: 4.14V
C: 4.90V
TR9 voltages:
B: 4.89V
I checked voltages across:
R55 (1K8 ... -
Spectrum +2 power supply - voltages on each pin..?My +2 suddenly stopped working yesterday. It was working fine earlier in the day and now the power light will not go on, nor will the tape drive and …
... few parts I notice the voltages going across the connector to ... happen to know what the voltages should be coming from each ... -
Pictures of 48k ZX Spectrums Showing the Important Voltages[SIZE=6][B]Pictures of 48k ZX Spectrums Showing the Important Voltages[/B][/SIZE] [URL="https://farm4.staticflickr.com/3841/15005543009_7bcf3b3031_o…
... ZX Spectrums Showing the Important Voltages[/B][/SIZE]
[URL ... -
ZX Spectrum+ video ? red on green problemThis is my first post on the forum, so let me introduce myself. I am retired for several years. For 30 years I have been a fan of the ZX Spectrum. I …
... replaced the transistors TR8 and TR9. Unnecessarily, because the original transistors ... /> I measured the power supply voltages at the relevant circuit points ... . All voltages are in line with service ... -
bizarre error on a grey ZX Spectrum+2 - the long search for a small problemHi, I got a ZX Spectrum+2 that worked a bit but crashed while loading or running 128k games. I installed a 128k-test-ROM that told me about RAM fa…
... the transverter generated the additional voltages. Therefore I now shorted the ... time before I had replaced TR9 by a ZTX651 with a ... -
ZX Spectrum Issue 4S composite video fuzzy (horizontal blur)Dear people of WoS, Thank you very much for taking the time to read. I have an Issue 4S I recently acquired and planned to fix up as a gift for a…
... observed the IC and transistor voltages closely resemble the ‘working ... Checked comp side connector power voltages (noted discrepancy for 23 12vac ... Checked under side connector power voltages 4.92v (3), 8 ... /> - TR1, TR2, TR4, TR8, TR9
- IC 14 LM1889N
New colour palette for 16K/48K/+ machines, based on ULA YUV voltagesI’ve made a colour palette for 16K/48K/+ machines, based on the YUV voltage tables in Chris Smith’s book The ZX Spectrum ULA. This colour palette …
... don’t have the YUV voltages in Chris Smith’s book ...Spectrum 48K / composite mod / LCD TV: voltages out of the ULAHello Spectrum World I have juste bought again my first computer on ebay... a Speccy 48k issue 2 with a 5C112E-2 ULA. Just had to replace TR4 and …
... ...". It doesn't match the voltages given in the great book ...One more grey +2 with video problemsI guess I need your help again to hopefully be able to do some proper troubleshooting myself one day. Here I have a grey +2, which could be a bottom…
... in the standard 48K. Check voltages on pin 1 and 14 ... ), then check for a shorted TR9.
Ah, yes. Download ...Composite video ghost image on ZX Spectrum 128K +2Hi, I have a ghost image on the composite video out on my ZX Spectrum 128K +2 and have run out of ideas of what could be wrong. Does anybody have a…
... at those voltages when I get home on Friday, plus TR9 and ...voltagesAll the Spectrums use a 9V power supply, I think. But would you get away with using a transformer that only gives you 7V?
All the Spectrums use a 9V power supply, I think. But would you get away with using a transformer that only gives you 7V?+3 Power Supplyg'day everybody. sorry to be asking for help in my first post (i know it's a tad rude), but how "generic" is the +3 power supply? does it supply mult…
... supply? does it supply multiple voltages like the C64's power ...Can't tune into spectrumHi - I recently discovered an old ZX Spectrum in amongst a load of junk (it's the 48K version). Not sure whether it works yet because when I try to t…
... more thing: I checked the voltages on pins 1 and 9 ...ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…
... OK. I have checked the voltages and they are all OK ...Composite video mod on a 16K issue 2, not workingI carried out the composite video mod detailed here: [url]http://user.tninet.se/~vjz762w/fixuspec.html[/url] I chose the one that requires the trans…
... +5V lines by measuring the voltages with the meter before I ...128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…
... /> I used multimeter to read voltages, don't have an oscilloscope ...Component Equivalents/substitutionsA while ago, I mentioned to somebody in a thread that we should have a list of component equivalents and substitutions so that it's easier to fix our…
... place of ZTX313 in TR8 - TR9 position issue 3+
ZTX750 ... and
BC 549B in TR9 and TR8 on an issue ...Dead +2B, help required...It was bought defective on ebay. It came with two faults: a "dead" power supply (it was the fuse) and a faulty main unit. The power supply is now re…
... 'll try to check all voltages on the ICs, but I ...Testing RAM Chips After RemovalHi I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I have a Logic Pr…
... and feed in the right voltages to the socket, what is ...Voltage SchmoltageOk then. Don't flame for wanting to use a C64 tape deck for this - it was the only one I have to hand which may be cannibalised for the purpose. So …
... the deck? it needs two voltages, +5 and +6. Copypasted from ...I want to build a new, super spectrum ;-)only kidding Andrew :-) my brain's going at a mile a minute at the moment, so I thought I should put some of the ideas down in case one of them is w…
... the power supply, making the voltages fluctuate and therefore killing the ...how to set voltage regulator to the correct setting ?On the power supply that is broken it says AC adapter INPUT : 230v 50Hz OUTPUT ; 9v 200mA Regulated On the variable voltage adapter i have the…
... sliding switch with various different voltages 3v, 4.5v, 6v, 7 ...Speccy 128 QuestionMainly for the experienced speccy resurecters around these parts. Have you ever had a Speccy 128 with a borked TEA2000 video chip? The reason I ask…
... so far tested that the voltages are all ok, and keyboard ...GP2X F200 QuestionsI should be receiving a GP2X F200 in the mail any day soon and was wondering if any of you have one. I wanted to get a power supply as well at some …
... that as long as the voltages are correct it may be ...R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…
... electrolytic capacitors, full check of voltages, new voltage regulator, new membrane ...SRAM replacement for lower 16KSome time ago I wondered if it were possible to replace the lower 16K RAM of a 16K/48K Spectrum with a single SRAM chip. You know, those pesky 4116 D…
... , that need 3 different supply voltages and are often the cause ...issue 6a faultyHi All I got issue 6a pcb from ebay with status faulty pcb had bad voltages when I power up I changed tr4 ztx650 and all voltages got back on ic6 I h…
... faulty
pcb had bad voltages when I power up
voltages got back
on ic6 ...issue 4s for reapirHi All, This time I have issue 4s for repair :) Here is few screen shots and small movie after boot. [url]http://forest.no-ip.org/issue4s/[/url] I kn…
... working fine and have good voltages in lower ram
12 ...zx spectrum +High i bought a spectrum + a while back that endend up that it didnt work.. the screen was just a scramble of colours..ive change the ktc(ztx650) and…
... (ztx650) and now all the voltages are present and now its ...48k spectrum restarts by itselfFirst of all hello from a newb and thank you for your help. This site has already offered me a lot of insight. I have a 48k spectrum that will boot …
... /[/URL] here I believe the voltages maybe wrong. But I am ... go when looking at the voltages at various legs. However because ...
