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On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …
... Do you have the voltages to run the lower ... />
The lower ram voltages are fine and i replaced ... br />
If those voltages are off (more than 0 ... QUOTE]
Lower mem voltages:
Pin 1: ... mem and measured the voltages on the z80, rom ... -
problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... pcb I've seen big voltages
[url]http://217.79 ... and hi memory have good voltages according to specifications but i ... -
ULA chipHi. Where i can find a ULA 6C001E-6 chip for an 3B issue Speccy ? Also looking for one 7805 heatsink... Thank
... if this is normal... (All Voltages are corrects, Ad/Dn lignes ... -
problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
Hi, Thomas3120
very good voltages i have
ic1 - ... -
48K Speccy not workingHey, A few months ago (hope it´s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…
... that, I'd check the voltages to the 4116 memory to ... were me, if all those voltages were correct, I'd change ... -
48K Speccy not workingHey, A few months ago (hope it´s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…
... 4116 memory, first, check the voltages, then simply swap out the ... -
48K Speccy not workingHey, A few months ago (hope it´s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…
... ]
We need to measure voltages between pins 3 and 2 ... -
48K Speccy not workingHey, A few months ago (hope it´s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…
... the pins to test the voltages, since checking the +12v/-5v ... -
48K Speccy not workingHey, A few months ago (hope it´s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…
... (once again) the lower RAM voltages, because a common component to ... check that all the correct voltages are present to indicate whether ... -
problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... ]Hi, Thomas3120
very good voltages i have
ic1 ... -
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…
Hi,
I have a issue 3B that has:
MPS 2369 in TR1, TR2, TR3 and TR6.
By the looks of the solders, they weren't replaced. They were placed during factory production.
Hope that helps. -
ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …
... the machine and quickly measure voltages before and after 7805. It ... -
+3 broken driveHi, I bought a +3 from E-bay, but the drive doesn't work :( I am not so familiar with Speccys, I know how to program them, but this is the first I'…
... would check all the correct voltages are present on your PSU ... -
Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
... do:
- Check the voltages being supplied to the 4116 ... +5v
- If the voltages are all correct (they should ... within around 10% of the voltages listed above) you know the ... -
Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
Well, the voltages are all correct to within 10%. Question - (Since I may as well test the memory anyway). Which chips form the lower 16k? I could just pull all the high memory out, and swap chip for chip with the low memory? Would that be of benefit? -
Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
... easy to diagnose. Since the voltages are correct, I would suggest ... -
Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
... easy to diagnose. Since the voltages are correct, I would suggest ... -
Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
... the rest.
Test the voltages on the 4116 chips and ... -
Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…
... you have all the proper voltages except -5V, then it should ... -
Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…
... you have all the proper voltages except -5V, then it should ... -
Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…
... coil makes all dem different voltages. Lose it, an them all ... must ave red dem ther voltages rong in first place :lol ... -
spectrum PSU'sI've read contradictory info on which psu(ie amp rating) is for which spectrum. :confused: The models and amp ratings are 1.2A, 1.4, 1.85 and 48k, …
... incoming voltage to three separate voltages, which are +12V, -12V and ... -5V. These voltages go off to power the ... can employ to get different voltages from these devices.
ZX81 power supplyFriend gives me ZX81 without power supply and i want to test whether he work or not. Can i use Spectrum p.supply for that purposes? I dont want to d…
... equipment, don't go sticking voltages in things :)
p ...PC Power supply for SpeccyHi all, after 13 years with out playing spectrum games I am eager to play the old games. Thus I got up to the garret checking my old stuff. Two of m…
... source to make all internal voltages (5V and 12V). Of course ... internal convertors and feed in voltages from PC PSU.
Also ...What I hate about computers and/or video gamingYesterday I spent approximately four months (subjecively that is, objectively it was around two to three hours) fixing my mate's PC. I won't bore you…
... able to lower CPU operating voltages so much, so at some ...ZX Spectrum Power Cable on +2AHi, Today I bought a +2A, but it is lacking a power cable. I rooted around and found one, but it is for an ordinary ZX Spectrum. Will it work? This…
... supply can supply the relevant voltages (is it 12V 5V and ...Speccy just snuffed it while playing 3D Pinball :(I have two speccys but the one I use most has just given up the gost! :-( game froze up and now all I get is flashing patterns and lines:-( Everyt…
... check is whether the right voltages are getting to the lower ...Speccy just snuffed it while playing 3D Pinball :(I have two speccys but the one I use most has just given up the gost! :-( game froze up and now all I get is flashing patterns and lines:-( Everyt…
... check is whether the right voltages are getting to the lower ...
