MAINTENANCE AND CARE
All JRDG products are designed to provide a lifetime of enjoyment and listening
pleasure.
Chassis are sealed to prevent dust from entering the interior of the chassis and thus
should never need interior cleaning during the lifetime of the product. All internal circuitry
is maintenance-free such that no adjustments of any kind are necessary over the lifetime
of the product. If the preamplifier is ever in need of service, updating, or upgrading, it
should only be returned to an authorized repair facility or technician for servicing.
The front panel of the unit is precision-machined in a unique process that incorporates a
diamond tipped cutting tool. This process was refined over many years to produce an
attractive and unique appearance. Because the surface is not finished in the typical
fashion of most audio and video equipment, there are a few rules that must be kept in
mind when cleaning the equipment.
NOTE: PLEASE ALLOW THE FRONT PANEL, WHICH IS COATED WITH AN AUTOMOTIVE-GRADE
POLYURETHANE FINISH, TO CURE FOR 6 MONTHS BEFORE ATTEMPTING TO CLEAN IT. THIS WILL
PREVENT SMALL SCRATCHES FROM MARRING THE SURFACE BEFORE THE SURFACE COATING
HAS HAD A CHANCE TO HARDEN COMPLETELY.
WARNING: THE FRONT PANEL OF THE UNIT SHOULD NEVER BE CLEANED WITH ANYTHING
OTHER THAN A VERY SOFT COTTON CLOTH AND PLAIN WATER OR FINE OIL-BASED FURNITURE
POLISH. BECAUSE OF THE FINE FINISH OF THE FRONT PANEL, USE OF ANY OTHER CLEANING
AGENT MAY PERMANENTLY SCRATCH THE FINISH.
The top cover, sides and bottom are protected by a durable black anodized finish and
can be cleaned with a soft cotton cloth (such as an optical lens or microfiber cleaning
cloth) dampened with plain water. Water should be applied directly to the cloth and not
the chassis. A very mild plastic or glass cleaner that does not contain ammonia may also
be used. If a mark has been left on the chassis, do not use any type of abrasive or
chemical cleaner to remove the mark.
If you have any questions about the care or cleaning of your
CRITERION PREAMPLIFIER
,
please contact your dealer or the JRDG factory before attempting to clean the chassis.
The use of a cleanser or abrasive to clean the chassis that has not been approved by
the factory will almost certainly damage the finish and will not be covered under
warranty.
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