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Guess the video faultI've two dead flesh Spectrums, one a 16K issue 2 outputting white with a tinge of blue (not as extreme as photo shows) with two pink horizontal lines…
... -making its solder connections or replacing it might cure the problem ... contact between yourself and the circuit that has an effect? Try ... -
Guess the video faultI've two dead flesh Spectrums, one a 16K issue 2 outputting white with a tinge of blue (not as extreme as photo shows) with two pink horizontal lines…
... -making its solder connections or replacing it might cure the problem ... contact between yourself and the circuit that has an effect? Try ... -
Finally got round to itFinally got round to giving my old speccy a close look. Details 1982 Issue 2 Seriel No 001 196193 Hmm... Followed the initial tests on You tube w…
... key parts of the circuit before even switching power on. This is ... ohms is measured at the power input socket, then something is ... needs to be corrected before power is applied. I'd suspect ... -
What influence the number of stripes during initialization?Hi for All! After some adventures, with other rare old computers I'm back here to my favourite forum. :) Recently I got some ISSUE 2 boards from Ben…
... capacitor controlling a transistor. At power up, the capacitor will be ... />
Depending on the actual circuit configuration (which may be different ... chip) the output from the circuit cell may be inverted. Hence ... -
Finally got round to itFinally got round to giving my old speccy a close look. Details 1982 Issue 2 Seriel No 001 196193 Hmm... Followed the initial tests on You tube w…
... component/board) disconnected from the power supply can be really useful ... course the characteristics of the circuit under test. Even more so ... when the circuit includes semiconductors.
This ... -
Zx spectrum 48+ help pleaseI have just had a look at my spectrum 48+ and I get this [IMG]http://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xfa1/v/t34.0-12/10965632_101526175830…
... or because the voltage converter circuit has failed.
Start ... multimeter to check all three power supply voltages at one of ... -
Speaker problemsI've been using a 2:1 pc speakers system with an amplified bass box thing for years now with no complaints. It only has one 3.5mm input jack on the …
... be driving both the input circuit of your amp and energising ... something in the output circuit of the other device, which ... circuitry and need its own power supply. My approach would be ... -
Zx spectrum 48+ help pleaseI have just had a look at my spectrum 48+ and I get this [IMG]http://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xfa1/v/t34.0-12/10965632_101526175830…
... the negative terminal of the power input (or the heatsink) and ... transistors TR4 and TR5 in circuit using your multimeter's diode ... up anything unexpected, I'd power it on and measure the ... power supply voltages at the lower ... -
TR4/TR5 replacementHi guys, I've got another Spectrum I'm working on now - an Issue 4S this time. When I originally got it, I powered it up and did the basic tests a…
The issue 4S circuit board caters for two different ... output of the voltage converter circuit (most likely a failed 4116 ... destroyed the moment you switch power on. If you use a ... bench power supply to feed to Spectrum ... -
TR4/TR5 replacementHi guys, I've got another Spectrum I'm working on now - an Issue 4S this time. When I originally got it, I powered it up and did the basic tests a…
... 819524]The issue 4S circuit board caters for two ... output of the voltage converter circuit (most likely a failed ... destroyed the moment you switch power on. If you use ... a bench power supply to feed to ... access to a bench power supply so will have ... -
No display on a 128 toastrackHi All, I just bought a 128k off ebay with the usual, "it worked last time I used it", so I read into this "it does not work". True enough, it does n…
... that it completely overloads the power supply and prevents the computer ... I can say is that replacing TR4 has solved the problem ... -
DivMMC Enjoy - I'm not enjoying it!My DivMMC Enjoy arrived today. Excitedly I rushed home to plug it into my +2a. I have quite a few SD card/CF solutions for my computers so I know wha…
... and added the different clock circuit details this January.[/QUOTE]
replacing the ULA the board worked ... -
Video ZX Spectrum+ 48k<span>Good day ... is a bit of time that I try to fix my zx spectrum ... I replaced the ram 4116, all electrolytic capacitors ... but the monitor loo…
... the possible faults. With the power off, you can test (using ... the appropriate schematic for the circuit details, but keep in mind ... -
Spectrum+2 Tape Deck Buzz<p>I've been messing with a Iss3 0500 Spectrum +2. So far I've replaced the electrolytic capacitors, flipped the transistors, add…
... of PL12 and the Datacorders circuit board. Mounted underneath the lip ... adjust the wiring for the power LED but that was simple ... -
Procedurally generated levelsThere seems to be a myth roaming the internet that Spelunky was the first game to use procedurally generated levels. I'm pretty sure there are ear…
... you raced it as a circuit, I have my doubts that ... driving over them, which Nintendo Power called "one of the coolest ... -
Procedurally generated levelsThere seems to be a myth roaming the internet that Spelunky was the first game to use procedurally generated levels. I'm pretty sure there are ear…
... you raced it as a circuit, I have my doubts that ... driving over them, which Nintendo Power called "one of the coolest ... -
not working issue 3Hi all, I received this mobo from ebay, after start i have this on screen [img]http://forest.no-ip.org/wos/issue3_01/20150728_135908.jpg[/img] …
... components in the voltage converter circuit have failed, though TR4 ... diodes in the voltage converter circuit too.
... diodes in the voltage converter circuit.
- Check for ... short between its power supply rails with them in circuit.
< ... -
Dead SpectrumHello guys, I've just bought a dead Speccy 48k (Rubber Keyboard Issue 3 board). Basically, when powered on it initially appears to boot up ok, but in…
... /> I would suspect the power converter circuit and the lower RAM - but ... -
Anyone Interested in All the Different Models of Kempston Joystick Interfaces?I've been acquiring some flat-type Kempston Joystick interfaces to adapt to K-55 (yes, spoiling our cultural heritage), but along the way I've picked…
Just got a Power Play one off eBay, out ... Kempston interface, hough with the Power Play logo embossed. Interestingly on ... doesn't mimic the Kempston circuit. It's a cheaper quality ... -
Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... PSU that I build supplied power via an I/O interface ... . This in turn fed a circuit board that I made that ... -
Spectrum CapacitorsLooking for some opinions here, if I may? In the 80's and 90's I used to repair Spectrums and other machines for a living so I'm reasonably famili…
... the electrolytic capacitors in the power section should always be renewed ... the power rail decoupling capacitors and the ones in the video circuit ... -
48k not startingHi team, I have 2 48k's, one works (Issue 4s), one doesn't (Issue 4a). The non-working one appears to start, but not finish the RAM test. The pape…
... testing anything other than the power pins, you will likely get ... />
A faulty TR7 open circuit TR7 will result in no ... -
Spectrum CapacitorsLooking for some opinions here, if I may? In the 80's and 90's I used to repair Spectrums and other machines for a living so I'm reasonably famili…
I tend not to like replacing anything that seems to be ... order. However, I do recommend replacing at least most of the ... capacitors also sometimes go short circuit and that can damage the ... -
PSU replacement for +2a/+3Hi, With the suitable connector does a PC power supply can be used to power a ZX+2a/+3 ? Thanks
... suitable connector does a PC power supply can be used to ... power a ZX+2a/+3 ?
< ... all three power lines simultaneously when a short circuit is detected on ... -
48K colour issuesGentlemen, A friend handed me over a number of 48K machines to service, and among these there are four of them with various flavours of colour iss…
... this circuit. They should not be damaged, as these are not power ... -
48K colour issuesGentlemen, A friend handed me over a number of 48K machines to service, and among these there are four of them with various flavours of colour iss…
... only from within the LM1889 circuit, yet the fact that the ... depends essentially from the digital circuit. How can it be?
power supply line and feed it ... clean 12Vdc from my lab power supply.
I'm ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... are properly fitted to a circuit board, the risk from a ... I recommend the following:-
Power everything down (including the display ... -
I recapped my 128K toastrack, installed stereo kit and detached audio from video, but...Hello fellow forumers! I'm seeking for help: I've finally decided to change all electrolytic capacitors of my 6U (with all Panasonics 105oC)... Af…
... circuit... I will also look for solder splashes. Then before even power ... ...
Then I'll power it up again to see ... -
I recapped my 128K toastrack, installed stereo kit and detached audio from video, but...Hello fellow forumers! I'm seeking for help: I've finally decided to change all electrolytic capacitors of my 6U (with all Panasonics 105oC)... Af…
... , 5v and 12v around the power area, OK... I also checked ... far as the synchronization signal circuit is concerned, do you mean ... -
48k problemsHi all Just plugged in a 48k that I bought to find that the screen is jumbled with different colour pixel blocks. I removed the casing and noticed…
... volts, assuming anormal Sinclair type power supply. Output (pin 3) should ... duff regulator or a short circuit somewhere dragging down the voltage ...
