Speck Electronics MicPre 5.0 - Manual (Page 9)

To avoid personal injury, do not remove the top cover of the
MP 5.0 and never operate the MP 5.0 without the cover properly
installed.
The MP 5.0 with its internal power supply contains voltages that
can cause serious injury or death. Refer all repairs to a qualified
service technician, or directly to Speck Electronics.
Do not remove the cover
Chapter 1 Introduction Section 3