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zx81 rf outputHi All I'm not sure if this is an appropriate forum for the zx81, however I'll ask anyway;) I've connected my zx81 up to a mid 90's color tv. I can…
... RetroTechie;504192]Better is to replace modulator circuitry with a ... My TV also preferred a capacitor in the signal (+ to ... />
Above transistor buffer (+ capacitor if used) fits comfortably inside ... this cirquitry with a 100uF capacitor to the video out. ... -
Some TAP files not working on DivIDEOne of the people who ordered a DivIDE from me told me het can't load certain TAP files, which load perfectly on emulators. I have encountered that …
... its just the C8 disc capacitor I have to remove to ... firmaware, I only have to replace the "old" R Gal with ... -
Some TAP files not working on DivIDEOne of the people who ordered a DivIDE from me told me het can't load certain TAP files, which load perfectly on emulators. I have encountered that …
... its just the C8 disc capacitor I have to remove to ... firmaware, I only have to replace the "old" R Gal with ... -
Spectrum 48k PSU voltageI have been running into problems with my rubber key speccy. To cut a long story short I did a voltage check of my power supply. It seems to fluctuat…
Maybe the capacitor thats inside the PSU (4700uF) is shortcirquiting. Replace it just in case. -
Recapping old equipmentOld household equipment,stuff like radios,is it worth recapping them?,i don't know if its worth the effort,surely they be fine?.
... is more than 5% off: Replace it.[/QUOTE]
To ... 'll need to desolder that capacitor... capacitor are cheaps, so if you ... -
RGB cableI constructed an RGB cable to my +3 as per schematic on page 14 of this document here: [URL="http://mts.speccy.cz/doc/128_rgb.pdf"]http://mts.speccy.…
... wondering though, if I could replace the 1k resistor in the ... .
I'd try the capacitor thing. or perhaps the cable ... -
Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... ) or short circuit C27 (the capacitor whose leads are usually used ... /> I asked the owner to replace the chip in IC11, and ... -
Guide price for a 48k rubberkeys from you lot?My trusty Spectrum (an Issue 3, working since late 1983 or early 1984) has finally upped and carked on me :-( Now I could hit ebay or the local boot…
... future damage, as when the capacitor dies it can destroy chips ... you don't want to replace the component because of expense ... -
Guide price for a 48k rubberkeys from you lot?My trusty Spectrum (an Issue 3, working since late 1983 or early 1984) has finally upped and carked on me :-( Now I could hit ebay or the local boot…
... future damage, as when the capacitor dies it can destroy chips ... you don't want to replace the component because of expense ... -
Guide price for a 48k rubberkeys from you lot?My trusty Spectrum (an Issue 3, working since late 1983 or early 1984) has finally upped and carked on me :-( Now I could hit ebay or the local boot…
... future damage, as when the capacitor dies it can destroy chips ... you don't want to replace the component because of expense ... -
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…
... be...
But I can replace them all if needed even ... the power cirquit I can replace, its easier than testing them ... capacitor, its ceramic (100nF). So can it be bad? Should I replace ... -
BBC Help?I refuse scour the interweb for hours looking for help in this, and i'm sure a few of you chaps own BBC's and/or have knowledge of the machine, so i'…
This basically happens to all BBC power supplies. The ancient paper smoothing capacitor just gives up and turns into a smoke machine.
Easy enough to replace.
[url]http://www.sprow.co.uk/bbc/howto.htm#powersupply[/url] -
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…
... , and try tuning that variable capacitor in the 17.7MHz oscillator ... /> [*]If you have a spare: replace 17.7MHz Xtal even if ... -
Issue 3B only sees 16k (and RAMTOP NO GOOD on loading)A ZX+ with issue 3B board that i got recently, does not see anything more than 32768 (sometimes 37267..) on "PRINT PEEK 23732 + PEEK 23733 * 256 (Ent…
... />
The guide suggests to replace IC21 at this point, this ... PCB. Some issues put that capacitor in the solder side rather ... -
48k Speccy chucks a wobblerI've got a problem with my rubber keyed 48k speccy. When it is first switched on everything is fine but after a couple of minutes the picture on scr…
... due to a faulty electrolytic capacitor, one of the smoothing ones ... probably a good idea to replace them all anyway. -
TR4 is goneMy TR4 transistor is burned. Can I replace this transistor with a TIP31B or C ? My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :) My Spectru…
... a faulty 4116 or filter capacitor (one of the electrolytic ones ... . It's usually wise to replace all the original electrolytic capacitors ... -
Spectaculator: Com port bug?I just bought Spectaculator yesterday but probably erred as the one feature it has that no other emulator has is the ability to use COM ports with an…
... to renumber your COM ports, replace the Interface 1 plugin [URL ... RX connection and a 10nF capacitor before it across the RX ... -
Computer repair questionAn ewgf-style post: I'm usually able to find my way around things, search online for solutions and a few other things, but this time I'm unsure of w…
... doing anything other than replace a bad capacitor or re-solder a ... -
Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…
It wasn't that one 1uF capacitor. I haven't radial caps left to replace all, so I started checking RAMs and guess what.... they were all checked ok so far. Will keep looking and update everyone as I go. Ordering some caps. -
Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…
... ;648227]
If the suspect capacitor is electrolytic and it is ... . Don't have caps to replace them all yet, ordering them ... -
Needing new capacitors. Where to buy online?Hi. I need new axial capacitors for a whole bunch of Speccy boards I have. Problem is, it's been hard to buy some of them online. Some shops will onl…
... rating. And if the capacitor is used for power ... temperature rating. 105 degrees can replace 85 degrees capacitors.
... 1uF you can also replace electrolytic capacitors with ceramic ... size. Make sure the replacement capacitor actually fits the board! ... -
128k +2 (grey) Ear mod - New ULA and still problemsBverstee kindly sold me a 128K ula since the one in my +2 seemed to have a broken ear in. But even with the new ULA, I still can not load games throu…
... once that had a bad capacitor. The problem now is I ... a capacitor? This is one of those I didn't replace yet ... -
+2 grey rf out problemI got a kind of broken +2. it basically works, but with a annoying rf out problem. When screen goes black (eg. after border 0: paper 0 command) it l…
... as an extra small value capacitor (remember humans are effectively a ... TV output, I suggest you replace the modulator (maybe some one ... -
telling the difference between speccysSorry for sounding like a dunce. ive seen a rubber keyed speccy in a local retro shop. How can i tell if its a 48k or 16k model without switching it …
... as it toasts the filter capacitor. The first job should be ... the paper mains cap and replace it with a polythene one ... -
Centre video signal from composite modded 48KHi! I made this simple video mod some years ago,to have a composite output instead of RF(on 48k). --from this site-- [url]http://user.tninet.se/~vj…
... that on a 48K to replace the UHF output with composite ... way, if I add that capacitor to the uhf changing in ... -
Strange +3 HW IssueI a have a +3 with Issue 2 board system powers up ok and is useable as computer Drive works ok (tested on another machine) the drive however doesnt…
... ensure that the nothing discrete (capacitor / resistor) is not at fault ... /> [/code]
[B]Check / replace these IC's[/B]
48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... guessing I dont need to replace the exact model but make ... same voltage?? So i can replace with much newer ones? Or ... to have a longer life. Capacitor technology has improved such that ... one lead back under the capacitor and slide a bit of ...CapacitorsSorry, another question... I've done a bit of looking around, although after a couple of beers this may not have been as systematic as usual, but I …
... high. Given the progress of capacitor technology, the replacements you ... repair: I do recommend you replace the electrolytic capacitors, but ... and perhaps the 22uF capacitor involved with the production ... said, I usually just replace all of them before doing ...Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…
... is always good practise to replace all the electrolytic caps on ... service manual. It is mainly capacitor and resistor values that need ... there is also an additional capacitor that needs to be soldered ...Yet another glitchy graphics 48kHeyo, I'm new both to the forums (sorry if this is the wrong forum) and to Spectra I'm afraid, picked up a 48k from a steam fair sale thingy (not th…
... are check the voltages, replace any capacitor that looks remotely dodgy, and ...
