2N Omega Lite - Installation Manual v1.9 - Manual (Page 9)

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2.2. PBX cover
The plastic cover bears a sticker with a transparent window for the display.
The cover is fitted on the chassis by fitting into two holes in the upper part of
the plastic and is secured by two extendable “pegs” into the lower part of the plastic.
When dismantling the cover, first press (using an appropriate tool) both
extendable “pegs”, whereby you free the cover and then remove the cover.