ESCO Technologies ETS-Lindgren, Assembly And Maintenance Manual

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9.2.2 CLEAN CONTACT FINGERS
Clean the door contact
fingers by brightening
the contact surfaces.
After brightening the
contact fingers and
doorjamb, wipe these
surfaces clean using a
cloth dampened with
denatured alcohol.
To avoid
damaging the
contact fingers, move
the sanding bar only in
the direction shown.
Do not clean
these surfaces
using an abrasive other
than the provided
sanding bar. Do not use
power sanders to clean
the contact surfaces.
Avoid touching
these surfaces
after they have been
cleaned; oils from skin
will speed corrosion and
reduce contact between
the surfaces.
Do not polish
brass contact
surfaces with brass
polish. This will cause
a severe reduction in
shielding effectiveness.
Do not oil
the door
hinges or mechanism;
these components are
permanently lubricated.