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Spectrum+ Noisey Picture ProblemHi fellow Spec-chums I need your help! I've recently brought a 48K+ Spectrum(issue 6A) that I'm trying to repair. I did all initial tests on it prio…
... replies.
I did replace C25 and C65 as Macc ... more capacitors so I can replace them all with new ones ... />
One last question, the 7805 regulator on this is speccy ... -
16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…
... add the 7805 power regulator as something than I would replace even ... -
16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…
... add the 7805 power regulator as something than I would replace even ... the heat generated in the 7805, add two 3A rectifier diodes ... no harm and helps the 7805 regulator by having to drop ... -
Plus D Voltage Regulator OrientationHi, I?ve got a Plus D Disc Interface circuit board without case from a friend. Sadly he sends it to me without care for proper packaging. So it arr…
A 7805 voltage regulator has pin out ... , the polarity is wrong so replace the cap. Don't just ... -
Plus D Voltage Regulator OrientationHi, I?ve got a Plus D Disc Interface circuit board without case from a friend. Sadly he sends it to me without care for proper packaging. So it arr…
... 25V electrolytic capacitor and the 7805 voltage regulator should have a ... />
[QUOTE=DEATH;713087]...so replace the cap. Don't just ... -
Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …
... , is the small amount to replace the current lost due to ... input voltage goes to a 7805 voltage regulator chip inside the ... -
Plus D Voltage Regulator OrientationHi, I?ve got a Plus D Disc Interface circuit board without case from a friend. Sadly he sends it to me without care for proper packaging. So it arr…
... br /> On 48k Spectrum: 7805 middle leg black multimeter wire ... to 7805 leg on PCB border ... On 48k Spectrum: 7805 middle leg black multimeter ...
On 128k: 7805 middle leg black multimeter wire ... 7805 to a new one, and step by step replace ... -
First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…
... replace anything other than the electrolytics. Might be worth changing the 7805 ... -
First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…
... , renew it.
The 7805 voltage regulators often get blamed ... to remove working chips and replace with sockets (bases). I only ... -
Toastrack trouble[IMG]http://i44.tinypic.com/11lq7id.jpg[/IMG] Sorry about the picture size, cant figure out how to make it smaller! Anyway, the pic says it all, th…
... yes, I remember that the 7805 was outputting just over 10v ... , the output voltage from a 7805 should be between +4.75V ... . If this does not help, replace the 7805.
If you ... have already fixed the 7805 and the voltage on the ... -
Toastrack trouble[IMG]http://i44.tinypic.com/11lq7id.jpg[/IMG] Sorry about the picture size, cant figure out how to make it smaller! Anyway, the pic says it all, th…
... rightly.
Look to replace the ZTX213/ZTX650 on the ... Spirantho.
Also the 7805 must be suspect if it ... only kicking out 4.5v - replace that too.
B -
Spectrum Missing -5vMy Spectrum is "almost" booting, just when you expect the (C) 1982 Sinclair Research to appear it just displays flashing squares on the screen :( I …
... +9V line (test on the 7805 voltage regulator)? If yes, then ... a soldering iron? If yes, replace TR4 with a new ZTX651 ... -
Another "untested" dead spectrum...Hi, I'm looking for some suggestions on a faulty Spectrum I have picked up. I'll need to wait until tomorrow before posting pics, but the screen is …
... +12V and -5V supply circuits. Replace the electrolytic capacitors regardless (as ... I would say that the 7805 voltage regulator is okay, so ... -
Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…
... , Mark. Should I try and replace R9-R16 then? It might ... to the tab of the 7805 voltage regulator (where the heatsink ... -
AAAARRRRR DIV-MMC ENJOY againIve recently been posting trying to get to the bottom of problems with my +48 not working with this rechid addon.Now ive finaly worked out theres not…
... /48k/plus/128k+ machines the 7805 voltage regulator works so hard ... are TR4 (a ZTX650, but replace with a ZTX651) that will ... -
Toastrack refurbishmentYesterday I opened a drawer in my old desk and discovered 2 complete toastrack 128s and a board only for the same. As I already have a fully working…
I repaired a +2 whose 7805 had popped its lid off ... thing, but I had to replace the wires leading to it ... -
Toastrack refurbishmentYesterday I opened a drawer in my old desk and discovered 2 complete toastrack 128s and a board only for the same. As I already have a fully working…
... motherboards appear to have normal 7805 chips...
The ... [QUOTE=guesser;780970]With the 7805 regulator switching replacements there's ... Some modern versions of the 7805 have thermal shutdown and overload ... , but I had to replace the wires leading to it ... -
Help me fix my grail ZX 128k SpectrumHi all, Ok today my grail toaster rack ZX spectrum 128k turned up. I finally found one and for a reasonable price. I powered it up and..... Nothing …
... found that, seems simple to replace. Where can I pick one ... the lead connected to the 7805 regulator pin 1 (the input ... the lead connected to the 7805 regulator pin 3 (the +5V ... -
Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…
... are to recap it, replace the 7805 with a newer one and ... -
'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
... a Recom R-7805-1.0 to replace the 7805
[*]Fit a ... -
Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
... /> Other than that, we'll replace 7805, TR3, TR6 and see how ... -
Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …
... removed. And a NPN cannot replace a PNP, or vice-a ... heatsink/metal tab of the 7805 voltage regulator for your meters ... -
Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …
... removed. And a NPN cannot replace a PNP, or vice-a ... heatsink/metal tab of the 7805 voltage regulator for your meters ... pad for negative (just replaced 7805 with a Recom unit) and ... -
The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…
... a dc/dc converter to replace the 7805, heat sink the ULA ... -
The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…
... at a replacement for the 7805 in the speccy, and think ... does a URR version to replace the upper RAM. If you ... hungry for more, you can replace the Z80 with a modern ... CMOS variant, and replace the 74LS logic on the ... -
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 …
... 7805 inside the Spectrum will become a lot hotter , hence I replace ... -
Issue 3B turning offI'm trying to save a Spectrum Issue 3B. I restored the power supply section, changing the 7805, TR4, and TR5, besides all electrolytic capacitors. No…
... damaged tracks, and try to replace the 7805 again.
I ... -
Issue 3b boarddiode ID5 and cap C47 are missing from my board will these have any effect on system powering up. I have checked the voltages on the 7508 and its …
... found a resistor across the 7805 in and out that's ... best to replace it or remove it and replace the 7805 as well ... -
Heat-sinking the spectrum 48+ :| [URL=http://s1063.photobucket.com/user/JRT480/media/Fotografia1988_zps5egnygdp.jpg.html][IMG]http://i1063.photobucket.com/albums/t515/JRT480/…
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As Moggy says, replace the 7805 voltage regulator with a Recom ... -
Things you hated about the speccyFor me it would be the Kempston interface coming loose and the machine crashing after a good session of waggling my joystick.
... /> The 7805 used to go wrong but it was easy to replace.
