For those having trouble with the cameras in their Mekra-Lang 400-series mirrors like we have on our ’11 Tour 42QD, I might have something that can help. The focus on the driver’s side camera had drifted so far off it had become unusable. Add to that, under certain conditions at night, both cameras would appear to fog over and become unusable. This looks to have been a combination of condensation as well as the IR LEDs illuminating any dust/dirt inside the housing glass.
I had read up on how to address these issues but the only statement I could find from the manufacturer said that there is no means to repair a camera that was out of focus and that replacement was the only option. Well, at this point I figured I had nothing to lose so I opened up the mirror and removed the camera. I followed the step-by-step instructions in the mirror manual I found online to get the mirror apart and the camera out. (
http://www.lang-mekra.com/fileadmin/...ice_Manual.pdf)
Using a set of snap ring pliers, I was able to twist off the rear cap of the camera housing:
The housing slides off, revealing the camera internals:
Remove the soft ring from the IR LED lighting assembly:
This should give you access to this pair of screws. Remove both:
Carefully slide the IR LED board up and off the lens. This will give you access to the small Philips focus set screw, as well as the lens, itself:
Loosen the set screw, then you should be able to rotate the lens to adjust the focus. I pointed mine out the driver’s window while watching on the dash screen to make sure it was set properly.
After you’re sure it’s set, use threadlock, a dab of superglue, or a dab of DW’s clear nail polish, whatever you’ve got handy or preferable to set that screw so the focus doesn’t drift again.
While you’ve got the housing apart, this is a good time to clean the inside of the glass. For us, this was the biggest source of that fogging/haze, and this one step made a real difference in how clear the picture was (yes, even beyond the focus).
Reassembly is the reverse of the above, with one key item: Before screwing the housing back on, lube the o-ring seal at the base. You could probably use Vaseline, I opted for plumbing silicone grease. Just wanted to make sure I got a good seal so as not to have to do all this again anytime soon!
I'm hopeful this helps folks with similar issues.
Respectfully,
Kris