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Maintainence
AM700 Audio Measurement Set Service Manual
6–5
Preventive Maintenance
Preventive maintenance consists of cleaning, visual inspection, performance
checking, and, if needed, readjustment. The preventive maintenance schedule
established for the instrument should be based on the environment in which it is
operated and the amount of use. Under average conditions, scheduled preventive
maintenance should be performed every 2000 hours of operation.
H Clean, non-abrasive cloth.
H Non-abrasive liquid glass cleaner.
H Isopropyl alcohol.
H Static-free vacuum cleaner with small brush attachment.
CAUTION. Cleaning and general care of the AM700 should be performed only
when the instrument is powered off and the power cord removed from electrical
mains.
The instrument should be cleaned often enough to prevent dust or dirt from
accumulating. Dirt acts as a thermal insulating blanket that prevents effective
heat dissipation, and can provide high-resistance electrical leakage paths between
conductors or components in a humid environment.
Exterior. Clean the dust from the outside of the instrument by wiping with a soft
cloth or small brush. A brush is especially useful to remove dust from around the
selector buttons, knobs, and connectors. Hardened dirt may be removed with a
cloth dampened in water that contains a mild detergent. Abrasive cleaners should
not be used.
Touch Screen. Clean the touch screen with a soft, lint-free cloth dampened in
denatured alcohol.
Interior. Clean the interior of the instrument by loosening the accumulated dust
with a dry, soft brush. Once the dirt is loosened remove it with low-pressure air
(high-velocity air can damage some parts). Hardened dirt or grease may be
removed with a cotton-tipped applicator dampened with a solution of mild
detergent and water. Abrasive cleaners should not be used. If the circuit board
assemblies must be removed for cleaning, follow the instructions for removal/re-
placement under the heading of Corrective Maintenance.
Tools Required
Cleaning