McIntosh MR 7083 Owner's Manual page 3

The lightning flash with arrowhead, within an
equilateral triangle, is intended to alert the user to
the presence of uninsulated "dangerous voltage"
within the product's enclosure that may be of
sufficient magnitude to constitute a risk of electric
shock to persons.
CAUTION: TO PREVENT THE RISK OF ELECTRIC
SHOCK, DO NOT REMOVE COVER (OR BACK). NO
USER-SERVICABLE PARTS INSIDE. REFER SERVICING
TO QUALIFIED PERSONNEL.
The exclamation point within an equilateral triangle
is intended to alert the user to the presence of
important operating and maintenance (servicing)
instructions in the literature accompanying the
appliance.
The serial number, purchase date, and Mclntosh
Laboratory Service Contract number are important to
you for possible insurance claim or future service.
Record this information here.
Serial Number
Purchase Date
Service Contract Number
Upon application, Mclntosh Laboratory
provides a Service Contract to the original
purchaser. Your Mclntosh Authorized
Service Agency can expedite repairs when
you provide the Service Contract with the
instrument for repair.