287.34(M1)
Figure 7-22.—Playback through extension speaker.
Minor Maintenance
You can expect to do very little maintenance
on tape recorders. Occasional] y, you may have
to clean surfaces or change pressure pads but, as
a rule, if more complicated maintenance is
required, you should return the recorder to your
maintenance department.
PRESSURE PADS.—If the pressure pads
do not hold the tape firmly against the heads,
poor sound will result. With the machine on and
in the PLAY position, check to see if the two felt
pads are worn or are not pressing the tape
squarely against the head pole faces. When
necessary, the felt pressure pads furnished for
replacement may be cemented in place with
household cement. The pads should cover the
shiny pole faces of the heads, and the side of
each pad touching the head must be free of
cement.
LUBRICATION.—Generally, all moving
parts of a tape recorder are permanently
lubricated, and with normal use no further
lubrication should be necessary.
Cleaning
The majority of defects, other than wear or
breakage, can be traced to dirty surfaces. The
play-record and erase heads, capstan, and
pressure roller are subject to an accumulation of
tape coating residue, which is rubbed off the
tape as it passes these parts. This accumulation
will cause faint recording and poor playback and
will impair the ability to erase. Therefore, the
accumulation must be removed periodically.
Remove the accumulation by wiping off the
record and erase heads, capstan, and pressure
roller with a clean cloth. If dirt is caked or hard
and will not come off with a dry cloth, dampen
the cloth slightly with alcohol.
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