Author Topic: Cosmo lower half teardown procedure  (Read 1571 times)

dTal

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Cosmo lower half teardown procedure
« on: February 19, 2020, 04:54:23 pm »
So I've been having some keyboard problems, and Planet helpfully sent me a replacement keyboard. It turns out, however, that the keyboard is essentially the entire lower half of the unit, and replacing it necessitates complete disassembly of the lower half. This proved to be an interesting little adventure, which IRC user Steve-Goodey encouraged me to document. Unfortunately the only camera I had was the Cosmo itself - so sadly no pictures, apart from this one of the back of the replacement (we all know what the front looks like): https://imgur.com/a/XeDhsj4

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Without further ado...

COSMO COMMUNICATOR LOWER HALF TEARDOWN

Pull the back off by prising under the hinge side. Fingernails more or less work for this. Note that the back has tiny locking tabs - these go on the hinge side. Place the Cosmo face down, with the hinge on side furthest from you.

Remove the two end caps - they are held in by 3 and 4 retaining screws respectively.

SMALL PARTS WARNING: the little silver button.

Remove all the battery retaining plate screws but leave the battery in place.

There are two small ancillary boards, one on each side. Each board has a retaining plate to hold down the ribbon cable connectors it accepts. The right hand one accepts the power cable from the battery.

Remove the screws holding down the battery connector retaining plate. Gently disconnect the battery by prying up the connector.

You may now remove the battery and plate (on my unit they are stuck together with adhesive).

Removing the ancillary boards: nothing fancy, just remove the screws. All ribbon connectors are of the vertical insertion type, except the keyboard ribbon. The keyboard ribbon cable connector is of the type often used in laptops - horizontal insertion with a locking flap.  The keyboard ribbon is the only ribbon cable that does not go into the screen, but loops over the top and out of sight. It is on the upper left.

SMALL PARTS WARNING: there are two tiny silicone ducts, one on each end of the Cosmo, underneath each ancillary board. They lead into a pair of MEMS microphones. They are easy to miss and easy to lose. Also, when putting them back, make sure the duct leads in to the microphone! It's possible to install them upside down, and you'll probably get muffled recordings if you do.

To completely seperate the two halves of the Cosmo, first gently peel all ribbon cables (except the keyboard ribbon cable) away from the surface. It doesn't take a huge amount of force, but try to pull vertically, not laterally. There are three hinges on the Cosmo. The middle one has a seperate subassembly which is screwed to the base with two screws. NOTE: These are the only screws which are different in the entire lower assembly - they are slightly longer! To remove the side hinge rods, gently pull with needle nose pliers. You might find it easier with the unit open. To full seperate the halves, disentangle them from the hinge spring by fully opening and unhooking the spring from the base.

Naturally, reverse the process to reassemble. Some screws go through multiple parts - it's helpful to stack the parts up "dry" so you don't put screws in too soon. And when you stick the ribbon cables back down, make sure you give them enough slack when the unit is fully closed.

Before I started I was quite afraid of putting my Cosmo under the knife, but actually it's quite a forgiving product to disassemble. Hopefully I haven't skipped any steps, as I wrote this from memory after the fact. Hopefully this helps anyone wanting to disassemble their Cosmo for some reason!

And the new keyboard is magnificent. Thanks, Planet!

EDIT: linked picture attached to the post. Varti
« Last Edit: December 09, 2020, 12:53:51 am by Varti »

spook

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Cosmo lower half teardown procedure
« Reply #1 on: February 19, 2020, 05:19:23 pm »
I am keeping this in case I need it. Thanks for the detailed rundown!

guizmox

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Cosmo lower half teardown procedure
« Reply #2 on: February 20, 2020, 10:58:01 am »
There is also a full teardown with pictures on the FCC regulation website.
Attached here.

maki.jouni

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Cosmo lower half teardown procedure
« Reply #3 on: February 20, 2020, 12:27:22 pm »
Nice to know that this thread exist now.

Have to hope that don't need to explore this subject any deeper anytime soon.

Thanks for sharing that document. And of course nice to hear that Planets support provided new mat and your keyboard is working just fine now.

My letter "e" is little bit tricky (have to touch bottom part of key. Also "Esc", "2" and "0" and "o" are also little bit tricky but not that bad as "e". Tried already removing keys and resettle those, but no lucky.

Edit: I wrote this with my Cosmo, so it seems that I compensate quite well those few flaws of keyboard.
« Last Edit: February 20, 2020, 12:30:16 pm by maki.jouni »
Cosmo Communicator (Fin/Swe), Mix2, Sony Xperia XZ & Z3, Nokia N900, Nokia PARSA, HTC Touch Pro, Qtek 9100, Nokia 6600 & 6210 & 2110, Mobira Talkman

Robert

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Re: Cosmo lower half teardown procedure
« Reply #4 on: December 09, 2020, 12:13:33 am »
dTal, I am also having some keyboard problems.

How did you get Planet to send you a new keyboard?

Thanks!

Pikku-iikka

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Re: Cosmo lower half teardown procedure
« Reply #5 on: March 09, 2021, 02:14:46 pm »
SMALL PARTS WARNING: there are two tiny silicone ducts, one on each end of the Cosmo, underneath each ancillary board. They lead into a pair of MEMS microphones. They are easy to miss and easy to lose. Also, when putting them back, make sure the duct leads in to the microphone! It's possible to install them upside down, and you'll probably get muffled recordings if you do.

Huh. I can't thank you enough. I just got my Cosmo from a hinge repair trip (2nd in a row) only to realize that something had happened to the device because the lower mic was not working properly. Nobody could here my voice unless I was tilting the device and speaking right to the bottom mic....

I and Planet both thought this is due to me installing rooted Android and Gemian right after repair. So, I followed their instructions and repartitioned the device and installed stock Android V23 back. No help.

Before sending my Cosmo to UK again, I remembered having read this thread. And I knew my Cosmo had been dis- and re-assembled while it's previous UK trip because 'B' and 'N' keycaps were put in opposite places.

So, I just HAD TO PEEK inside the Cosmo's mic area, to see how these 'ducts' are... To find the 'ducts' I only had to remove the back cover plate and some screws but not any wirings. There they were, the 'silicone ducts'. The duct in the ear side was facing a 'hole' upwards, while the duct in the mouth side was facing a 'hole' downwards.

So, I turned the latter upside down. Then I reassembled the Cosmo and made a test call: woo-hoo, everything working again!

Maybe some other people's mic problems could be solved this way? So, not a software, but a hardware (assembly) error...


I contacted Planet telling about my repair procedure, and they said this will not brake my warranty. Kiva.


-iikka
« Last Edit: March 09, 2021, 02:19:20 pm by Pikku-iikka »
Pikku-iikka (alias Little Ike - 194 cm / 130 kg)
Planet Cosmo Communicator
Samsung Note 8, Jolla Phone (Sailfish), Nokia N9 (Meego)
Raspberry Pi 4B / RetroPie setup emulating Amiga.