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5v reg replacementHi all, Have been playing with one of my Issue 2 Spectrums and decided to replace the 5v regulator & heatsink with this wee switching reg I had lyin…
... replace the 5v regulator & heatsink with this wee switching reg ... -
What is this disk interface (and how to use it)?Anybody seen this floppy disk drive interface before? It uses an MB8877A and the rest is 74XX-logic, no GALs/PALs. And an EPROM. [IMG]http://i1373.p…
... actually looks like the cooled 7805 on that PCB does the ... -
Switched voltage regulatorIn the past a replacement voor the (hot!) 7805 has popped up a couple of times in various threads. As far as I know, Recom Power Inc. was always ment…
... a replacement voor the (hot!) 7805 has popped up a couple ... -
'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…
... pin socket)
[*]Regulator & Heatsink
[*]The Coil
[*]C47 ... of another mobo without the heatsink so I'm not sure ... -
48k - Why Won't it Buzzzz?Hi WOS ;) I bought a load of Spectrum games off eBay and thrown in for good measure was a 48k 1984 Issue 6a circuit board that I was told was for sp…
... took some voltages around the 7805 regulator and the positive end ... -
48K misplaced coloursHello to everybody! Slowly recapping a otherwise working Issue 6A 48K. All new caps aroud LM1889, 7805 and DC-DC converter, which improved ripple an…
... . All new caps aroud LM1889, 7805 and DC-DC converter, which ... -
Microdrive repair - GREAT NEWS!Microdrive repair facts: We know (almost) pure alcohol and cotton swabs are needed a lot to clean the Microdrive head. We know cartridges degrade, so…
... the process I resoldered the 7805 pins and the soldering contacts ... -
PlusDlite v2014.1 - problems with floppy power supplyI received a small batch of boards of the new PlusDlite design, which is similar to the original PlusD, with GAL etc. The main differences with the o…
... note that I removed the 7805 from that clone, and feed ... -
IDEA: ZX Spectrum dock.[LIST] [/LIST]The ZX Spectrum dock Inspired by my foray into RGB/SCART cables and my XPS 12 dock: [IMG]http://i.dell.com/sites/imagecontent/product…
... reducing the work of the 7805, so heat inside the Spectrum ... -
ZX Spectrum 128 without a heatsinkHi, There appears to be a ZX Spectrum 128 without a heat sink. Are my eyes deceiving me? [url]http://www.ebay.co.uk/itm/161629312522?_trksid=p2055…
Hi,
There appears to be a ZX Spectrum 128 without a heat sink. Are my eyes deceiving me?
[url]http://www.ebay.co.uk/itm/161629312522?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT[/url] -
Screen artifacts/shimmer after composite modHi folks,<br><br>I've done a little work to what I hope is going to be my work-horse rubber key speccy - It's a Samsung made issue 3b.<br><br>I notic…
... installed one of those traco 7805 replacements.
Anybody have ... -
128k Numeric keypad<span style="font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; font-family: Arial; font-size: medium;">Help anyone …
... five or six Spectrums (128 heatsink models) which control and play ... -
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…
... testing just the motherboard with heatsink connected. Connected the keyboard and ... -
Display bandsHi all, I'm busy working on an issue 3 16k Spectrum I picked up on eBay. I've upped it to 48k and put a new membrane in. I noticed the display was…
... difference. Finally I replaced the 7805, no difference.
The ... -
Issue 1 schematics?I'm fault-finding an issue 1 board. So far I've found a hot memory chip and snipped it's supply legs, then swapped the burnt-out 7805 for a switched…
... , then swapped the burnt-out 7805 for a switched regulator. Now ... -
Faulty Issue 1Hi all, thought I'd document my efforts in getting another speccy working. I've never done this before so please bear with me... I recently took a p…
... - initial power on reveals duff 7805 and the left-most lower ... supply legs, and replace the 7805 with a Traco Power DC ... -
Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…
... />
The voltage from the 7805 seems fine. Possibly CPU or ... -
Issue 6a - no soundHi all I get from ebay one issue 6a, Burned 7805, ztx 650 After this all look fine, zx diagnostic board pass mem test but not have sound, i change…
... one issue 6a,
Burned 7805, ztx 650
After this ... -
zx81 helpHello all Sorry if I have posted in wrong section. I have a question about my zx81 I am getting no screen and the metal heatsink (plate that sti…
... no screen and the metal heatsink (plate that sticks out at ... -
128k toastrack helpHello everyone So. I just bought a toastrack 128k. No show when plugging into TV. The PSU is fine and tested with a multimeter. Chips are not gett…
... in. However. Seems that the 7805 is so hot I cannot ... . So is it likely the 7805 is dead? I cannot find ... -
Bizarre ZX Spectrum faults (also possibly relevant to Spectranet compatibility problems).I'm attempting to repair an issue 4A 48K ZX Spectrum and am encountering some very strange problems. For my own records I've given this computer the …
... the electrolytic capacitors and the 7805 (the original had some broken ... -
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…
... power supply section, changing the 7805, TR4, and TR5, besides all ... -
FTV-1 info sticker (?) on a +2 grey heatsink[img]https://m.flickr.com/#/photos/130902294@N06/26087120803/[/img] I've just received this +2 grey. I'm puzzled by what appears to be information r…
[img]https://m.flickr.com/#/photos/130902294@N06/26087120803/[/img]
I've just received this +2 grey. I'm puzzled by what appears to be information relating to the Sinclair FTV-1 inside. Can anyone advise me what this is all about?
It's a ... -
48K Issue 6a wobbly and flickering TV outputHi folks, Found an untested issue 6A Spec whilst tidying up and it had a warranty sticker on it from a past repair which seemed to be a socketed L…
... I can I swapped the 7805 for a switching regulator (Tracopower ... -
128K + Toast Rack getting quite hot?Just wondering something if someone can put my mind at ease After using my 128k for around 10 minutes+ it seems to get quite warm around the heatsin…
... get quite warm around the heatsink area/to the left by ... changed the regulator on the heatsink for a brand new 5v ... -
128K Toastrack (Noisy video output)Hello there guys! Need all of yours guides and advices. Some time ago I bought a nice looking 128K from eBay (motherboard v6K) and put it aside for…
... capacitors with a new ones, 7805 voltage regulator, TR4 and TR5 ... -
Frying a 48K ZX Spectrum (revision 4A) with 10 V instead of 5 VHello I got a used zx spectrum. When I opened it up, there was no 5 V positive voltage regulator at the 10 V power inlet. Instead what would be in…
... input and output of a 7805 or similar were short cut ... -
48k Issue 6a Very sick indeed.Hi Guys. I have a 48k Issue 6a board that shows a white screen with grey border. The white screen has three black squares spaced equally on the le…
... I have fitted a new 7805 regulator, socketed lower and upper ... -
48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…
... changed them, fitted a new 7805, 100µF composite mod and ... -
Broken Issue 2 - likely culpritsI've just got hold of an issue 2 spectrum with an interesting layout (heatsink is vertical and goes down to the speaker, some variable resistors and …
... spectrum with an interesting layout (heatsink is vertical and goes down ...


