Maintenanc 17
4.4. Lamp Replacement Procedures
Scale illumination is provided by two miniature incandescent lamps on each
side of the scale (four total). These lamps are operated significantly below
their normal rating to ensure long life. If, however, it becomes necessary to
replace one more of these lamps, replacements may be obtained from your
local electronics supply distributor, or from Dorrough Electronics. The
lamp has the following ratings:
Type: CW85
Size: T1
Voltage: 8V
Current: 50 mA
Light Output: .095 candlepower
Base: Straight wires, solder in.
Use a low wattage soldering iron to remove the defective lamp and to con-
nect the new lamp to the circuit board. Remove any excess solder before re-
assembling.
4.5. Return Procedures
Your Dorrough model 280 or 380 Digital Loudness Meter is warranted for
a period of one year from date of purchase. Be sure to complete and return
the Warranty Registration Form to activate the warranty.
In the event it is necessary to return your model 280 or 380 to the factory for
service, in or out of warranty, you must first obtain a Return Material Au-
thorization (RMA) number from Dorrough Electronics at (818) 998-2824 or
FAX at (818) 998-1507. If the original shipping materials are not available,
be sure the unit is adequately packed.
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