Lumens DC160 Visualiser - Focus broken

[Duranis]

Just wondering if anyone has used these and had a similar problem. In the last 2 days I have had 2 of these units develop a fault with the focusing. The focus seems to be stuck at about 2cm from the lens. If you press the focus buttons it sounds like it is doing something but the focus does not change (have tried using the focus buttons, menu option and via a PC). I'm fairly sure it is a physical fault and having looked at it the focusing parts are in a sealed unit with the lens so can't do much there. Have tried firmware upgrades as well.

 

Fairly sure they are beyond repair but thought it was worth a shot posting here in case anyone has any bright ideas that could save me having to buy new ones

[difinity]

If its broken and heading for the bin, you have nothing to lose by trying to open the sealed unit. Must be a seam somewhere to work a blade in and along. I personally use single sided razor blades, but a new stanley blade should work.