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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 ... -
damaged spectrum+ (blinking squares)Hi, Sorry for my poor english, but I couldn't find on family forums any remedy for my hardware problem with my first speccy in my life :) I've bought…
... , little squares.
I verified voltages on back edge:
B20 ... -
ZX Spectrum + Issue 6A Repair attemptHello everybody! I got ZX Spectrum + which doesnt work properly. On power up I can see color mosaic, then paper goes black and i can see thin red ba…
... all 4116 with no effect, voltages are good (i replaced LM7805 ... -
Help me understand ZX RGB signal (long)This will be a long post so please bear with me and most importantly help me. I have a 128K+ and +2A that I'm trying to get working with my 15kHz RG…
... sure though what are the voltages on the Amiga). When we ... look at the voltages required by the device it ... -
TV went black & white...Yesterday my old, trusty CRT television suddenly decided to show TV channels in black & white only. (and nothing of value was lost... :grin:) It's a…
... & I know about high voltages inside CRT's, but if ... -
Powering up a Speccy after long-term storage.Staying at my folks for Christmas. Feels good to be back in God's country again, even if it is -12C outside at the moment. :-o Anyway, I was plannin…
... multimeter with me to check voltages, incase it has gone bad ... -
broken 48K, strange screenwell I finally socketed all lower 16K ram chips, (8 of them in a row near corner, not those 4 in two rows) and replaced them with new ones but it did…
... /> edit: I just tested the voltages on RAM chips and they ... -
ZX Spectrum 48K,issue two - can't get it repairedI have an issue 2, which has some weird very small PCB hanging over the Z80. Some wire go to various places on the big PCB, two go to connections 36 …
... lower memery chips the following voltages:
+ 12.01V
+ 4 ... -
ZX Spectrum 48K, issue - works fine till it gets hot (?)ZX Spectrum 48K, issue 2, works just fine, tested with Winston's diag board. At a certain moment in time however, it seems to run hot and stalls. Whe…
... still measure all the right voltages on the lower memory chips ... -
Fuzzy Screen On 48k Spectrum.Hi there. I bought a Spectrum off eBay last week (another for my collection lol), and it suffers with a fuzzy screen e.g. it looks like interference …
... there. I've checked the voltages of all the transistors and ... from the resetting it seems). Voltages from the jack plug to ... /> Oh BTW, to test the voltages on both machines, I had ... -
2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…
... at first but all the voltages seem correct; Aprox. 12V Input ... -
A major revamp of a computerI'm thinking about buying this motherboard here: [url]http://www.asrock.com/MB/overview.asp?Model=A330GC[/url] AFAICT the DIMM slots for RAM are the…
... 4 pins only supply some voltages that are already there, that ... -
now lost the +5v from my +3 psuthe voltages i get from it are -12v +12v +0.61v what part needs replacing in the housebrick that is the PSU? having a bad weekend :-(
the voltages i get from it are
-12v
+12v
+0.61v
what part needs replacing in the housebrick that is the PSU?
having a bad weekend :-( -
try to fix issue 4 board problemHi I try to fix speccy 48. All voltages are in place, ula 100% ok, cutted +5v from ic25 so far no luck. What next? ROM or upper memory? wojtek (i…
... to fix speccy 48. All voltages are in place, ula 100 ... -
Composite ProblemHi everyone :smile: I have done the composite modification on a few of my rubber key Spectrum's, and I've had no problems with these on my old porta…
... I've also measured output voltages from the Spectrum and my ... -
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…
... />
Any ideas? Are there voltages at specific points on the ... -
2 blown PSUs in one dayI got a SAM Coupe today, and the PSU started to smoke as soon as I turned it on. Since the Spectrum +3 PSU looked up to powering the SAM, I wired to…
... .
I checked the voltages. 12V and -12V were fine ... -
black +2 go awayHi, All what is my problem if i have the proper voltages inside my black Spectrum +2 black (+5v+12v) in all the important IC's , and not have any vi…
... if i have the proper voltages inside my black Spectrum +2 ... -
Hires Opus Discovery picturesAs I had the rare and awesome opportunity to be able to buy 5 or 6 Opus Discovery interfaces this year, and because I couldn't find hires pics of the…
... Discovery interfaces were:
- defective rectifier
- defective ROM
- one ... -
Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…
... draws high current and the voltages drop?
Any guess ... -
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…
...
The first two voltages are correct on my machine ... what to do if these voltages are wrong but Im assuming ... -
Faulty rubber speccy - advice neededHello all speccy hardware gurus :) Recently I moved to a new flat and after a long time have some space (and time) to dig out my old Speccy hardware…
... the power supply and the voltages on the lower ram chips ... -
No colour after changing LM1889NI replaced the faulty LM1889N in my issue 2 spectrum, since I had a very yellow picture, and soldered a socket to put the new LM1889N into, however, …
... and VR2 to get the voltages right. I can not check ... -
Misbehaving 128K toastrackI acquired a toastrack some time ago off ebay and it worked just nice up until recently. It arrived with no PSU or cables so I paired it with a grey …
... service manual and measured some voltages which all seem within working ... -
Intermittent reset on 48K (issue 4S)I'be been fighting an intermittent selfreset the whole day. Changed ULA - did not help. Tested TR6 as i could and compared the reading with another…
... is about .6A
All voltages checked - all fine.
Looked ...
