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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…
... a little to low. I replace it by one from my ... the next steps:
- replace all caps. This I have ... unsure about my readings
- replace TR4 an TR5 by equivalents ... working Speccy.
- replace 7805. The voltage and current reading ... -
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…
... 'd just go ahead & replace TR4, TR5 and electrolytic caps ... />
I'd just leave 7805 in place for now, and ... worn out (but still working) 7805 voltage regulators causing wavy screen ... -
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…
... to make the display good, replace the 7805. By now most of ... -
what is this crazy modfound a speccy in my loft yesterday,and it seems to have an external heatsink modd i havent the foggiest about speccys heres a few pics [url]http://i…
... much interferance from an overloaded 7805 regulator - so he plumbed it ... />
I would suggest you replace this with a 78T05 (*Fairchild ... -
Making a Zx Spectrum betterIs there anyway to make my Grey ZX Spectrum more power efficient and more reliable from the original you get. What I mean is we all know the ZX Spec…
... good quality fresh ones.
Replace 7805 power regulator with the Recom ... lot less power consumption).
Replace all transistors with fresh ones ... -
Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
... />
[QUOTE=kamilb1998;601859]
7805 regulator=4.95V
[/QUOTE ... have gone bad or just replace the lot. They only sometimes ... -
48K Issue 3, noisy display.Has anyone here experienced and been able to resolve a problem that looks like this: [URL="http://drizzle.zigg.net/ZX/ZX106-display.jpg"]Photogra…
Replace the two capacitors on the ... of the board (but prefferably replace all electrolytic caps).
If ... that doesn't help, replace the two transistors right below ... doesn;t completely solve it, replace the 7805. -
ZX Spectrum 48k issue 3b power problem?Hi :) I was lucky enough to find a couple of ZX Spectrums at a car boot sale yesterday. I spent the evening fiddling about with one (issue 2) and t…
... then internally regulated by a 7805 / 78S05 regulator for 5v, ... look here and decided to replace the 7805 regulators on both the ... sure that we need to replace the membrane.
The ... it now (since replacing the 7805) starts on the normal 'sinclair ... -
ZX Spectrum TowerHi all, i am working on a ZX Spectrum 48K build in a PC tower case. Is there anyone who did it before? I have some questions duo the PSU. I have to g…
... -12v/+12v/-5v and a 7805 for the +5v.[/QUOTE]
replace the voltage regulator with a ... /DC converter. I believe the 7805 is rated up to 35V ... -
ZX Spectrum TowerHi all, i am working on a ZX Spectrum 48K build in a PC tower case. Is there anyone who did it before? I have some questions duo the PSU. I have to g…
... Recom DC-DC convertor to replace the 7805 (I bought mine at ... -
RF output instabilityHello! Now i need help :) One of my rubber keys (48K) behaves a bit strangely on behave of RF TV output. When booted the picture is stable. Then i …
... problem is still there then replace the two ztx313 transistors under ... />
Also a worn out 7805 is known to affect picture ... -
48k PSU UpgradeCan anyone give the definitive word on a PSU upgrade (rather than just a replacement) for 48k machines? I'm thinking of adding at least an IDE inter…
... around that I ordered to replace mine when it went pop ... 7809 (9v version of the 7805) regulator in my spares box ... in parallel (and possibly a 7805 too for 5v) to power ... in my sig) has a 7805 reg with two 100uf electrolytic ... -
48k PSU UpgradeCan anyone give the definitive word on a PSU upgrade (rather than just a replacement) for 48k machines? I'm thinking of adding at least an IDE inter…
... /> Intended to use it to replace the 7805 in my spectrum, but ... -
48k PSU UpgradeCan anyone give the definitive word on a PSU upgrade (rather than just a replacement) for 48k machines? I'm thinking of adding at least an IDE inter…
Tip: replace the [I]internal[/I] 7805 regulator with a switching regulator ... if it came through a 7805.
Couple that with ... -
Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …
... ?)[/QUOTE]
Well. The 7805 was what first blew on ... . Then 4116 went. I replaced 7805 and 4116, and ran it ... probably keep on working to replace old parts with new fresh ... will soon replace the 4116s with 4164s and the 7805 with a ... -
+2 OverheatingMust first give thanks to Dazza75 for supplying me a replacement +2 however it seems to be overheating and corrupting graphics in games making them u…
... would in this case replace the 7805 regulator with a new one ... /> I recommend that you replace the 7805 with [URL="http://www.ebay ... -
48K+ losing horizontal syncHello! I've got this 48K plus in perfect cosmetic condition and it works well except for when it gets a tad bit warmer the image rolls around. That w…
[QUOTE=Spirantho;644846]Check the 7805 too. Some of them as ... have a go and simply replace it... nice advice! -
Getting an 14Mhz crystal to oscillate?I am building a circuit with an 74LS32 and a 74LS193 to work as frequency divider. Though I have hit a snag, how to I wire up a crystal to make it os…
... heatsink on any Issue by replace the 7805 with a switching edition ... -
Getting an 14Mhz crystal to oscillate?I am building a circuit with an 74LS32 and a 74LS193 to work as frequency divider. Though I have hit a snag, how to I wire up a crystal to make it os…
... heatsink on any Issue by replace the 7805 with a switching edition ... have any recom replacements for 7805. -
12V -> 9VI found this simple dc-dc converter: [url]http://www.mcrent.com/workbench/dcdc1216/[/url] it converts 12V to 16V, can it be used to produce 9V by mod…
Replace you 7805 with a compatible DCDC like this, [url]http://mikrokopter.altigator.com/recom-dcdc-switching-regulator-r785010-5v1a-p-77.html[/url] (I think there is a 1.5A model available). Then speccy can take 12v directly and make less heat! -
12V -> 9VI found this simple dc-dc converter: [url]http://www.mcrent.com/workbench/dcdc1216/[/url] it converts 12V to 16V, can it be used to produce 9V by mod…
[QUOTE=XorA;655419]Replace you 7805 with a compatible DCDC like ... -
PLEASE HELP!! DEAD SPECTRUM!!Sad News!!! I have a spectrum issue 5 board and I'd done the general composite mod which was great and it worked with a divIDE plus (RWAP) and esxDO…
... point, it probably means the 7805 is toast. Even if you ... could have a look and replace the regulator if it's ... -
Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…
... first thing to do is replace all electrolytic capacitors. 30 years ... one! :smile: ). You might replace the 7805 regulator too as it's ... to be working. Capacitors & 7805 are cheap and easy to ... Depending on results you can replace individual chips or consider a ... -
48k faultyHi guys! I have a 48k that, currently, presents 2 problems: 1 - Can?t sync to TV correctly. I get a lot of noise and the characters appear to be inc…
... />
-> Replace all electrolytic capacitors, and perhaps 7805 regulator too. When ... -
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…
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…
... edge connector contacts
4. Replace Z80
5. If the ... unmodified DivIDE: if that fails, replace ROM of ZX Spectrum
7805, and consumes about the same ...+2 (Grey) and AT/ATX PSUAny ideas on the best way to power a grey +2 board from an AT or ATX PSU? Looking at the schematic, I could do this one of two ways... 1: Bypass th…
... (or equivalent) device to replace the 7805, then you can just use ...Slight PlusD Mini problemsI'm advancing rapidly now on the PlusD Mini: [IMG]http://benophetinternet.nl/hobby/vanmezelf/20130330_104705.jpg[/IMG] [IMG]http://benophetinternet…
... .
I only did not replace th PlusD ROM yet.
7805 and connected the ZX 5V ...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…
If you haven't yet, replace the 7805. While you've got it removed measure the resistance between the 0V and 5V lines on the PCB to make sure it isn't unreasonably low.16 colours on a Timex Sinclair 2068I'm putting a few videos up on YouTube, the first one shows the colours on the TS2068. [url]https://www.youtube.com/watch?v=1tJ1qIMcTUE[/url] Brigh…
... +7.5V and use a 7805 linear voltage regulator to drop ... improving the picture is to replace the composite output with an ...
