Sony AV-3420CE Service Manual page 26

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CAUTION
Saturate a cleaning tip (accessory X-36090-19-0)
with SONY cleaning fluid (accessory Y-20310-01-0)
or
methanol
(spray
cleaner,
such
as
M/S-brand
magnetic
head
cleaner.)
Rub
the
cleaning
tip
across the head tip from side to side.
Avoid vertical
motion which might damage the video head.
brush pressure
adjust screw (1)
upper drum
7-2
head
assembly
to keep the cleaning tip away from
brushes.
Head degaussing:
Through
constant
use, the heads
may
become
magnetized resulting in a noisy picture.
Bring the
tip of the degausser
(SONY
model
HE-2) as close
as possible to the head
tip without contacting the
head.
Then
remove
the degausser
very slowly at
least three feet from
the head, before
turning off
the degausser.
Fig. 7-3
Head degaussing
scribe marks
drum support
brush pressure adjust screw (2) .

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