Mark Levinson Reference Preamplifier N32 - Manual (Page 26)

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1. Lift connector end of cable out of hole in shield box if
needed.
2. Using the 5 ⁄
64
" hex driver, remove four button head screws
from top cover of phono module.
3. Carefully lift top cover off over cables and lay it to the side.
4. Touch the metal enclosure of module before touching any
component inside module to prevent ESD damage.
You must repeat this step if you so much as walk across the room
to get something. In fact, it is good practice to touch the metal
case first, each time you are about to touch anything within the
unit.