It means the head is worn and the machine should be replaced.  A temporary
fix sometimes works.  Without a tape in the machine put it into play and
then advance both speed controls to full.  Using a cloth press it against
the wheel and shaft that are turning near the front of the opening for a
few seconds to wipe any material from them.  Then wipe the tape head which
is a square thing protruding near the middle of the front of the tape
opening to wipe any material that may have become attached. It is best to
ask your lending library for a replacement even if the fix seems to work
because the squeal will start soon again.

                               XB
                                IC|XC


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