Reset button

skagon · Post by **skagon** » Sun Oct 27, 2013 8:28 pm

1024MAK wrote:...I did not think that it was easily removable/replaceable.

The only thing I can safely say it is, is easily breakable...

RWAP · Post by **RWAP** » Sun Oct 27, 2013 8:31 pm

Dead easy to remove / replace - the plastic top of the soldered part just lifts up and out springs the red part (normally about 5 feet across the room)....

Post by **vanpeebles** » Sun Oct 27, 2013 8:58 pm

Sounds like those old toy tanks that fired matchsticks

RWAP · Post by **RWAP** » Sun Oct 27, 2013 9:02 pm

Pretty much the same amount of fun - although finding the spring afterwards is a real pain!!

dilwyn · Post by **dilwyn** » Sun Oct 27, 2013 9:47 pm

RWAP wrote:Dead easy to remove / replace - the plastic top of the soldered part just lifts up and out springs the red part (normally about 5 feet across the room)....

...or direct into Rich's eye!

1024MAK · Post by **1024MAK** » Sun Oct 27, 2013 10:19 pm

And very easy to prevent the err, "gun" from firing - just use your finger to stop it!

Mark

Mr_Navigator · Post by **Mr_Navigator** » Mon Oct 28, 2013 3:08 pm

: Untitled-1.png (10.02 KiB) Viewed 7222 times

From what I can see the RESET button on both issue 5 and issue 6 simply grounds the RESET in on the ZX 8302 ULA. This is not a special switch and could be replaced by a push to close momentary action push-button and couple of fly leads carefully soldered in. If you after authenticity however that is a different matter.

I was in the process of recreating the circuit diagram for issue 5 to a very high quality one, only to lose all my work after a catastrophic drive failure and no back-up. I do intend to start again but cannot find where I originally got the image files from. There were about 8 that made up both Issue 5 and 6 and I used these as a template to which I overlayed vector equivalents. Anyone know where I can get them?

I checked Google and Dilwyn's site, the quality is too poor to identify component values.

tofro · Post by **tofro** » Mon Oct 28, 2013 3:32 pm

Lee,

There is a QL Service Manual on World of Sinclair that has a bit better scan quality (I think) than the one on Dilwyn's site (It's also OCR-ed and thus searchable)

ftp://ftp.worldofspectrum.org/pub/sincl ... Manual.pdf

Regards,
Tobias

1024MAK · Post by **1024MAK** » Mon Oct 28, 2013 3:38 pm

More on schematics and service manuals here

Mark

skagon · Post by **skagon** » Mon Oct 28, 2013 4:52 pm

Mark, I've got a service manual right here. Printed, that is. Unfortunately, no scanner, but I doubt it'd be of much use as the schematic pages are bigger than A3.
Anyway, I know what the Reset button connects to and I've got a momentary switch hooked, I just don't like the idea of a dangling switch hanging out of the hole. And yes, I am looking for originality. However, I had another look this morning and it seems I was probably looking at something else, since the button is a plain DPDT with normal pin pitch so it can be found. I've already checked DigiKey's bible and I've spotted one or two possible replacements. Won't have the black cap but... what can you do.

However, if I manage to fix that QL (it's the one with the RAM error), it might be an idea to get it converted to desktop. Properly. And use one of those nifty keyboard interfaces too. That's not a bad idea... so the broken reset button can be removed and headers attached to get a reset button in front.

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