[Photos] Canon S-51 typewriter (SMK "peerless"?)

I found a cheap-looking electronic typewriter at a flea market for €5. The keycaps were nice though and I liked the key feel so I bought it without looking further. And when I got home, I took it apart ...

Keyboard:
CanonS-51.jpg


We have seen other other Canon typewriters, but with Alps stems and switches. This keyboard however, has two other types of switches that I have not seen before. Also, the keycaps are cylindrical, not spherical... except for the ones on either side of the space bar which are flat.

The full-size keys have a discrete integrated slider-over-spring-over-conductive rubber dome-over-PCB switch, whereas I think the smaller buttons are merely discrete integrated domes.

PCB
CanonS-51_PCB.jpg

CanonS-51_PCB_back.jpg

Apparently, this keyboard was made by SMK. And like some verified SMK switches, these switch modules have no markings other than a digit or letter, probably indicating position in the injection-mould parts tree.

The LCD screen 's PCB is attached to the top of the plate, with passthrough to the keyboard PCB which has a ribbon cable to the typewriter's main PCB.
CanonS-51_modules.jpg

In each switch's bottom, there is a dome, and ...

Large switch
CanonS-51_key_off.jpg

... inside the top of a larger switch module, I can just see that there is a coiled spring in there.
I have not found a way to take these modules apart, yet ...

The large switches are light and clicky, with a very light sound that got louder after I had unscrewed the PCB-plate assembly. The switches feel linear up to the click point at which resistance drops off and the dome inside juts forward.
So, this is most likely similar to the Fujitsu Peerless mechanism — but I would dare say, better, as these are light and stable. No key felt the least scratchy on a off-centre key press but then I got this in good condition.

With my measly calipers I measured total key travel at 4 mm and (slow) travel to actuation to ~2.5 mm.
I do suspect that (as Peerless switches), the actuation distance could vary with typing speed.
They bottom out soft and distinct, like good rubber domes (such as Topre, BTC etc).

CanonS-51_stab.jpg

The stabilisers are nice too. Hinged inside the keycap and the clips in the plate have ramps that guide the stabiliser wire into the right position when you install it. A much better solution than Costar-style or Alps stabilisers IMHO.

Small switch
CanonS-51_small_dome.jpg

CanonS-51_CODE.jpg

The smaller switch has a slider that covers the top of the switch: the entire top presses down and only a short amount.
The mount is not Cherry MX-compatible BTW. These can also have stabilisers.

Anyone seen these before? I quite like the larger switches. Clicky but quiet.
Last edited by Findecanor on 28 Sep 2018, 21:10, edited 1 time in total.
Findecanor

Unread post28 Sep 2018, 18:45

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I actually found a few of these among a collection of random NOS switches I picked up a few months ago. I have several of the bar mount integrated dome version. I have one of the cruciform mount, but my instance has a cutout in one corner that I assume is for an LED.

switches-47.jpg



They are interesting switches, but like most rubber domes all the action happens very close to bottom out.
They all appear to using a conductive pad for activation. Does the PCB on your board confirm this?

Edit: The cruciform one only seems to have about 2mm of total travel.
Engicoder

Unread post28 Sep 2018, 19:19

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Cool. Do you have any lead from your purchase back to any manufacturer?

Yes, the swirly gold pads on the PCB in the image are each two terminals shorted by the conductive pad on the bottom of the dome when pressed.

The cruciform-mount switch has very low key travel, yes. I'm sorry I forgot to mention that. Also, the buttons on those "keys" are much lower than regular keys to start with. The circle is a dial on the display's board, which I think adjusts contrast.
I have not actually fired up the typewriter, because it was missing a power supply. It does take batteries though, but I don't have any that large... have not used for years. :-þ
Findecanor

Unread post28 Sep 2018, 20:59

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Fuck you Google for ruining YouTube!
Findecanor wrote:Cool. Do you have any lead from your purchase back to any manufacturer?

Unfortunately, no. The lot of switches had examples from several different manufacturers.
Engicoder

Unread post28 Sep 2018, 21:22

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I actually just picked up a Cannon Typestar 6 (S-60) and was about to start a thread about it, but here we are! It uses the same switches with the same caps but has an additional small text button to the left of the mode button. The switches are pretty nice to type on and they sound pretty nice as well. It is certainly a nice find.

EDIT: Mine also has some spanish characters (Ñ ¿ ¡) which yours does not have, but this is probably not related to the model difference.
Last edited by zrrion on 28 Sep 2018, 23:03, edited 1 time in total.
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Unread post28 Sep 2018, 22:36

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Apparently the S-51's keyboard has the pad for the S-60's "Text" button. Maybe they have the same PCB, unless the S-60's bigger display's PCB needs more pins.
Please do post your pics. I have only crappy cameras.
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Unread post28 Sep 2018, 22:58

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Anyone looking for Alps-compatible keycaps on Canon typewriters just have to look for the centred lock light on the caps-lock, worked like a charm for me when rummaging through ads on my "craigslist". :)
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Unread post01 Oct 2018, 08:49

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