Sony DNW-A100 Maintenance Manual page 197

Installation
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The upper drum cover is supplied with the upper
drum as repair parts. And it is used for positioning
of the upper drum. Never remove it in carelessly,
and follow the instructions described below.
7. Cleaning
(1) Clean the portions below with a cleaning cloth
moistened with cleaning fluid.
. New upper drum assembly mounting
surfaces (shaded portions shown in the
figure)
. Lower drum flanges (shaded portions shown
in the figure) and edge portion
. Lower drum's tape running surface and lead
portion (Refer to Section 5-2-4 in Mainte-
nance Manual Part 1.)
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After cleaning, wipe with a dry cleaning cloth.
(2) Wipe the portions shown in figure using a dry
cleaning cloth.
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Never apply cleaning fluid to the contacting
points and patterns.
. 20 contacting points of upper drum
. 56 patterns of upper drum
. 56 contacting points of lower drum
. 20 patterns of lower drum
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
. . . . . Upper drum ASSY
. . . . . Lower drum ASSY
Edge(Cleaning)
Flange
(Cleaning)
5-2. Upper Drum Assembly Replacement
Mounting surface
(Cleaning)
: Wipe with a dry cleaning cloth
Contacting points
(Wipe with a dry cleaning cloth)
Patterns
(Wipe with a dry cleaning cloth)
Cleaning
5-13