I had a support email come in stating that the user's MicroSD card doesn't click into place on their T400. It could be one of several thing happening.
- The MicroSD card is not pushed in all the way
- The MicroSD card slot spring mechanism is temporarily stuck
- The MicroSD card slot is broken
Cause: The MicroSD card is not pushed in all the way
Solution/workaround: Try pushing the MicroSD card with the edge of a credit card or similar item.
Background: In a prototype revision of the T400 I didn't like the MicroSD card protruding past the enclosure surface. For the next prototype I nudged the MicroSD card holder inward a tiny bit. It worked great and was beautiful, so I gave approval to start production. A few days later I trimmed my fingernails and that's when I realized it was difficult to push the card in with short fingernails. Woops! I'll fix this in the next board revision.
Cause: The MicroSD card slot spring mechanism is temporarily stuck
Solution 1: Push the card all the way in and all the way out several times. If your fingernails are short, you may need to use the edge of a credit card to help.
Solution 2: If Solution 1 does not work, remove the circuit board from the enclosure and repeat the process again.
Background: The MicroSD slot has a multi-state mechanism similar to a clicky pen. As the card is pressed in and out the mechanism changes state from fully inserted to fully out with a few transitional states in between. Sometimes if a card is removed while part way between states the mechanism can get stuck.
Cause: The MicroSD card slot is broken
Solution: Contact support at email@example.com. We'll work out a solution that best suits your situation (skills, location, etc.).
Background: If your MicroSD card slot is broken, please get in contact with me at firstname.lastname@example.org. I'm terribly sorry for the inconvenience. This reflects poorly on Pax Instruments and I want to make it right. I personally test each T400 in production. In a part of the production test I insert a MicroSD card into the holder and a read/write test is performed. Then I click the card in and out several times to check the MicroSD card slot mechanism. Unfortunately, things sometimes break after they ship. You can test something for N cycles only to have it break at cycle N+1.