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Dead Spectrum+Hi! Any suggestions where to start finding what's broken: Spectrum+ with issue 6A motherboard and nothing on TV. Top row of the upper memory chips g…
... 'd start CHECKING for bad voltages before replacing anything. Take into ... if this is absent, no voltages will be generated even if ... -
TV is on the blink - litterally.My TV has gone on the blink. Its a Philips Matchline 32" CRT (See image below). When I turn it on the sound comes on, it makes the usual Bzzzt of th…
... power supply (CAUTION, very high voltages can be present in some ... -
TV is on the blink - litterally.My TV has gone on the blink. Its a Philips Matchline 32" CRT (See image below). When I turn it on the sound comes on, it makes the usual Bzzzt of th…
... =Winston;566176](CAUTION, very high voltages can be present in some ... -
Speccy 2010 UpdateI've made myself a to Speccy 2010. In addition to TurboSound (2xAY) it adds SounDrive and Covox support. Supported modes are SounDrive Mode 1, SounDr…
... AY implementation, based on the voltages gasman measured eons ago, and ... -
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…
... .
But if those voltages aren't good, chances are ... you focus on restoring those voltages before trying further tests. The ... -
ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…
... the 5v supply, the other voltages are only needed by non ... -
Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…
... :[LIST]
[*]Check internal supply voltages (+5, +12, -5V), just to ... -
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…
what sort of pattern?
Have you gone through the steps in the repair guide to isolate the lower ram so you can test the supply circuits? If so are you getting all three voltages correct now? -
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…
... /> Yep I just checked the voltages on all the 4116 chips ... -
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…
... ]Yep I just checked the voltages on all the 4116 chips ... -
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…
... big problem this time have voltages and nothing more ...... :) may be ... -
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…
... 4116s are very sensitive to voltages.
It could also be ... -
Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…
You're right about the voltages, of course - the power circuit ... -
Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…
Point taken regarding the multiple voltages generated prior to the 5v ... -
Merging romsHello, I want to flash an eprom with two roms so I can make a speccy be able to have a dual rom using an external switch. I thought i had it right b…
My willem had always issues with voltages on ZIF socket. Probably I should return it to seller, but I left it to fix it myself. Then.... It was easier to get new better programmer :grin: -
Merging romsHello, I want to flash an eprom with two roms so I can make a speccy be able to have a dual rom using an external switch. I thought i had it right b…
... willem had always issues with voltages on ZIF socket. Probably I ... -
Merging romsHello, I want to flash an eprom with two roms so I can make a speccy be able to have a dual rom using an external switch. I thought i had it right b…
Merging romsHello, I want to flash an eprom with two roms so I can make a speccy be able to have a dual rom using an external switch. I thought i had it right b…
If you read EZO forum, there are a lot of issues with incorrect voltages on Willem. My Willem has only 12V power supply, but DC-DC converter, yes it could be source of problems. Maybe one day I will give it a look again.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…
... Speccy is running with this Voltages far away from the specification ... degraded over time to change voltages but the Speccy still running ...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…
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…
... will it clean up the voltages, it'll make the display ...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…
... be nice to know the voltages over T60 and T61, and ...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…
... , roko let me update the voltages on Friday to you. But ...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…
... the pulsating nature of the voltages no real meaning can be ...Opus Discovery issues!All happens at once when things go wrong eh? This time its the dual drive Opus, neither drive will read/write, motor spins, when formatting you can …
... /connections the +5 and +12 voltages should be checked for correct ...Opus Discovery issues!All happens at once when things go wrong eh? This time its the dual drive Opus, neither drive will read/write, motor spins, when formatting you can …
... /connections the +5 and +12 voltages should be checked for correct ...Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... works perfectly. So, either timings/voltages in the Spectrum+ just happen ...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…
... . Here we go for the voltages:
R60, 100 ohm ...
