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Amplifier Maintenance, Cleaning, and ProtectionAmplifier Maintenance, Cleaning, and Protection
Maintenance and Cleaning
All Jeff Rowland Design Group products are designed to provide a lifetime of enjoyment and listening
pleasure. The chassis is sealed to prevent dust from entering and the interior of the chassis should not
need cleaning during the lifetime of the product. All internal circuitry is self-adjusting such that no
adjustments or maintenance of any kind are necessary over the lifetime of the product. If the
amplifier is ever in need of service, updating, or upgrading, it should only be returned to an authorized
repair facility or technician for servicing.
The Model 302 Stereo Power Amplifier is uniquely constructed from a number of precision machined
aluminum subassemblies. The front panel of the unit is machined in a unique process that
incorporates a diamond tipped cutting tool. This process was refined over many years to produce an
artistic and attractive finish.
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.
! Please allow the front panel 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.
! The top cover, sides, and bottom cover can all be cleaned with a soft cotton cloth (such as an
optical lens cleaning cloth or fine furniture polishing rag) dampened with plain water. Water
should be applied directly to the cloth and not the chassis. If a mark has been left on the
chassis, do not use any type of abrasive or chemical cleaner to remove the mark. A very mild
plastic or glass cleaner that does not contain ammonia should be tried only as a last resort.
! Please contact the factory before trying any type of cleanser on the chassis other than water to
clean the unit.
! 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, small scratches from the use of any other agent to clean the front panel will become
very visible.
If you have any questions about the care or cleaning of your Model 302 amplifier, please contact your
dealer or the Jeff Rowland Design Group 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.
Protection Systems
The Model 302 Stereo Power Amplifier is equipped with active circuitry and thermal circuit breakers for
protection against excessive AC mains voltage. However, since no protection circuitry or system can
completely protect a product from every electrical hazard, certain precautions should be observed.
In the event of severe voltage hazards such as lightning or when the amplifier will not be used for
extended periods of time, the amplifier should be unplugged from the AC mains to avoid potential
damage to the internal circuitry. All other audio/video system components should also be
disconnected from AC mains power as hazardous voltages can travel throughout an interconnected
system.
Maintenance and Cleaning
All Jeff Rowland Design Group products are designed to provide a lifetime of enjoyment and listening
pleasure. The chassis is sealed to prevent dust from entering and the interior of the chassis should not
need cleaning during the lifetime of the product. All internal circuitry is self-adjusting such that no
adjustments or maintenance of any kind are necessary over the lifetime of the product. If the
amplifier is ever in need of service, updating, or upgrading, it should only be returned to an authorized
repair facility or technician for servicing.
The Model 302 Stereo Power Amplifier is uniquely constructed from a number of precision machined
aluminum subassemblies. The front panel of the unit is machined in a unique process that
incorporates a diamond tipped cutting tool. This process was refined over many years to produce an
artistic and attractive finish.
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.
! Please allow the front panel 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.
! The top cover, sides, and bottom cover can all be cleaned with a soft cotton cloth (such as an
optical lens cleaning cloth or fine furniture polishing rag) dampened with plain water. Water
should be applied directly to the cloth and not the chassis. If a mark has been left on the
chassis, do not use any type of abrasive or chemical cleaner to remove the mark. A very mild
plastic or glass cleaner that does not contain ammonia should be tried only as a last resort.
! Please contact the factory before trying any type of cleanser on the chassis other than water to
clean the unit.
! 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, small scratches from the use of any other agent to clean the front panel will become
very visible.
If you have any questions about the care or cleaning of your Model 302 amplifier, please contact your
dealer or the Jeff Rowland Design Group 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.
Protection Systems
The Model 302 Stereo Power Amplifier is equipped with active circuitry and thermal circuit breakers for
protection against excessive AC mains voltage. However, since no protection circuitry or system can
completely protect a product from every electrical hazard, certain precautions should be observed.
In the event of severe voltage hazards such as lightning or when the amplifier will not be used for
extended periods of time, the amplifier should be unplugged from the AC mains to avoid potential
damage to the internal circuitry. All other audio/video system components should also be
disconnected from AC mains power as hazardous voltages can travel throughout an interconnected
system.
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