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Yea hee hee we have an S3.The latest phone to arrive on my desk. The Samsung Galaxy S3. :D Here it is beside my current Galaxy S2 (the black one). Good job they ordered a whi…
... yes I have an iPhone 4S.[/QUOTE]
The iPhone ... -
48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…
That reminds me of when TR4 kept blowing up on my ... /> 3. After fixing -5V circuit, TR4 blows :))
4. After fixing ... TR4, finally it was working.
< ... -
4116 replaced by 4164 - "Noisy" paper?After I replaced my 4116's with 4164's and hooked them up to +5V, disconnected -5V and +12V, I have what looks like vertical lines in the paper, like…
7805 is replaced, every electrolyte is replaced. TR4 is replaced. D11 is replaced. I will try to get a photo of it. -
Known Z80 M1 problems?I got an email yesterday from someone asking for a Z80 without the M1 problem. I only know about the fanout problem that many Z80's are suffering of…
... is machines built around Issue 4S which are most likely to ... -
ZX 128k +2 Bad deal - BrokenI recently traded a C64 for a ZX Spectrum 128k +2 (grey model). I sent a fully working C64, with doubles of the tapes I had. I recieved a shabby and …
... plug from my broken 48k 4S and soldered in place to ... -
Known Z80 M1 problems?I got an email yesterday from someone asking for a Z80 without the M1 problem. I only know about the fanout problem that many Z80's are suffering of…
... is machines built around Issue 4S which are most likely to ... -
Using an ATX power supply - Spectrum 48kOK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :( There is a MOD to use an ATX power supply on the…
... have it currently on a 4S). On the Issue 2 it ... (still working on my Issue 4S machine, waiting for parts). -
Using an ATX power supply - Spectrum 48kOK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :( There is a MOD to use an ATX power supply on the…
... have it currently on a 4S). On the Issue 2 it ... (still working on my Issue 4S machine, waiting for parts).[/QUOTE ... -
Issue 4S Schematics and DC-DC circuitA while ago I bought a Spectrum 4S that had problems tuning. I removed the RF tuner as I was not going to use it and did the composite mod. It worked…
... /> Only issue remaining on the 4S is that the paper is ... -
JSSpeccy v2.0 releasedI'm pleased to announce version 2.0 of JSSpeccy! [url=http://jsspeccy.zxdemo.org/]Online version[/url] [url=https://github.com/gasman/jsspeccy2]Sour…
... does work on my iPhone 4S, although it takes about a ... -
JSSpeccy v2.0 releasedI'm pleased to announce version 2.0 of JSSpeccy! [url=http://jsspeccy.zxdemo.org/]Online version[/url] [url=https://github.com/gasman/jsspeccy2]Sour…
... does work on my iPhone 4S, although it takes about a ... -
Issue 3 power problemHi all, I have an issue 3 board with an odd power problem, I have no -5V in fact, measuring the voltage on this line leads to a surprising result : …
Assuming that you replaced Tr4 while there still was another defect part, then there is a good (100%) change that Tr4 is gone again.
Your +12v might be just the '+9' coming from the powerbrick. -
Issue 3 power problemHi all, I have an issue 3 board with an odd power problem, I have no -5V in fact, measuring the voltage on this line leads to a surprising result : …
... ;640742]Assuming that you replaced Tr4 while there still was another ... a good (100%) change that Tr4 is gone again.
Your ... do have a few replacement TR4/TR5s so I could try ... -
Issue 3 power problemHi all, I have an issue 3 board with an odd power problem, I have no -5V in fact, measuring the voltage on this line leads to a surprising result : …
Well replaced TR4/TR5 again, and still no -5V :(
Cheers.
Phill. -
Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…
Can you completely disable the expansion and run it as a 16K machine? If not, then your expansion is not what's failing. Does your computer makes the "buzzzz" noise when you turn it on? If not, TR4 may be broken. -
Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…
TR4 is ok. Memory is all replaced by 4164s. Disabling high ram does nothing. -
Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…
[QUOTE=Johan1973;641321]TR4 is ok. Memory is all ... -
Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
My DivIDE built by Velesoft works with both my Issue 4S 48k machine and my issue 2 48k machine (before failed upgrade that rendered it inoperable). -
Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…
... test. THe one in my 4S issue machine is soldered to ... -
Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…
... compare it to an Issue 4S machine that is working. And ... -
Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…
... spent yesterday converting my Issue 4S machine to sockets, so I ... of memory on the Issue 4S, running DivIDE test bios to ... -
16k Issue 2 board and DivIDE load errorsI today got an Issue 2 16k board (thank you PMSR) that i added the logic and ram on to get a 48k machine. However, I am unable to load software from …
... , which is strange, since my 4S loads from this signal without ... -
Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…
... , i will buy today the TR4 and TR5,
you said ... />
ZTX651/652/653 for TR4
ZTX751/752/753 for ... on web i found that TR4 is more reference to ZTX650 ... -
Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…
Any of the ZTX65x series will work for TR4. Where x > 0 they are just later versions of the ZTX650. I think they have slightly improved specifications over the original. -
Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…
... low resistance your next transistor TR4 will burn. If there is ... no TR4 in the Spectrum then at ... -
Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…
... . Replace D11, perhaps D12, and TR4 and TR3 (Sorry, mean TR5 ... -
16k Issue 2 board and DivIDE load errorsI today got an Issue 2 16k board (thank you PMSR) that i added the logic and ram on to get a 48k machine. However, I am unable to load software from …
16k Issue 2 board and DivIDE load errorsI today got an Issue 2 16k board (thank you PMSR) that i added the logic and ram on to get a 48k machine. However, I am unable to load software from …
... (one from you), one issue 4S, and one Issue 3 128k ...

