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TESTING OF CUSTOMER'S SYSTEM
I. CLEANING AND INSPECTION OF THE STYLUS TIP
A. Cleaning the Stylus
For the stylus to trace the groove accurately, it must be clean. To clean the
stylus, use a camel's-hair brush (size No. 2 or smaller), trimmed to a length
no longer than
l h
inch. Dip the brush in an ethyl alcohol and distilled water
solution (mixed about 50150) and brush the stylus with a forward motion,
from the rear (terminal end) of the cartridge to the front. Never brush or
wipe the stylus from front to rear or from side to side. The alcohol will
remove any sludge deposits which may have coated the stylus.
Note: All Shure styli may be cleaned in this way. However, for other makes
of pickups, obtain manufacturer's procedure before using the alco-
hol solution, as permanent damage may result.
B. Stylus Tip Inspection
The stylus tip can be checked with a microscope having a minimum of 200X
magnification, such as the Shure Stylus Evaluation Kit. The stylus should be
positioned under the lens so that the bottom or record side of the tip is facing
the lens. The tip must be illuminated on the two sides corresponding to the
record groove walls. After focusing the image, the wear can be determined
by comparing the image of the tip to the photographs (Figures4 through 12).
Caution: A badly worn tip will drastically reduce the life of the test record,
and it is not advisable to continue with the remaining tests except
le turntable speed check.
Fig. 4
Fig. 5
New spherical stylus
Worn spherical stylus
Fig. 6
Severely worn spherical
stylus
Fig. 7
Fig. 8
New elliptical stylus
Worn elliptical stylus
Fig. 9
Severely worn elliptical
stylus
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