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post #1 of 1 Old 05-21-2011, 09:34 AM Thread Starter
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Location: Texas Denton/Krum
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Thumbs up MTF Keychain Teardown and repair by littletractorguy.

Notes for Mods - feel free to move this to Things I Broke Today, Tool Time, Mechanical Paint and Restoration, or possibly Tech Exchange if you think this post might help OTHER members who might find themselves in this situation! Or possibly make it a Sticky, too... Yeah... a sticky! That's the ticket!

Well, tonight LTGal inadvertently ran my beloved MTF keychain through the wash... Through no fault of her own... I had intended to take it out to the garage and put the key for Ernie (my 110) on it and hang it in a place of honour, or at least someplace where I could FIND it... Unfortunately I got distracted and forgot to do so, leaving it in my pants pocket. To its credit the keychain survived its trip through the wash and still functioned! A little TOO well, as you can barely see in this first picture...



Once it came out of the wash, it would not turn off! Uh oh! Time for a teardown to dry out the insides of the keychain before the batteries go dead or it rusts and I have to sandblast it!

Tools Required

1 - Phillips Head # 0 screw driver
1 - 3.0 Slotted Head Screw Driver

Step 1 - Turn over keychain to access case screws

Be sure to support the keychain adequately, as we don't want any injuries from falling keychains!

Step 2 - Remove Split Ring


Removing the Split Ring is crucial to a total teardown as with IT in place, you cannot access the hidden, third case screw to remove the Split Ring Mounting Barrel (see illustration below). The 3.0 Slotted Head Screw Driver can be used to assist in removal if the ring proves difficult to separate. Safety goggles would be recommended in that case.



Step 3 - Once the hidden case screw and Split Ring Mounting Barrel are removed from the unit, remove the two lower case screws.



Step 4 - Carefully separate the upper case from the lower case, and remove the rubber button assembly from the lower case. The LED-Switch Assembly will be revealed.



Step 5 - Carefully remove the LED-Switch Assembly from the case, noting which way the switch assembly is oriented on the case



Step 6 - Dry the insides using compressed air (well, okay, actually, I just wiped it on my shirt and blew on it for a while...)


Reassembly

Follow the steps detailed above, in reverse order




Note regarding the batteries

As you can see from the image below, there are two small watch-type batteries contained in the keychain. Replacement will be difficult when required, as the batteries are contained in the assembly by a clear plastic shield, likely intended to keep the batteries from either a) sliding out of place or b) contacting the outer metal case.

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