IBM Memo about Peripheral Replacement
This is an actual alert to IBM Field Engineers that went out to all IBM
Branch Offices. The person who wrote it was very serious. The rest of us may
find it rather funny.
Abstract: Mouse Balls Available as FRU (Field Replacement Unit) Mouse balls
are now available as FRU. Therefore, if a mouse fails to operate or should
it perform erratically, it may need a ball replacement. Because of the
delicate nature of this procedure, replacement of mouse balls should only be
attempted by properly trained personnel.
Before proceeding, determine the type of mouse balls by examining the
underside of the mouse. Domestic balls will be larger and harder than
foreign balls. Ball removal procedures differ depending upon manufacturer of
the mouse. Foreign balls can be replaced using the pop-off method. Domestic
balls are replaced using the twist-off method. Mouse balls are not usually
static sensitive. However, excessive handling can result in sudden
discharge. Upon completion of ball replacement, the mouse maybe used
It is recommended that each replacer have a pair of spare balls for
maintaining optimum customer satisfaction, and that any customer missing his
balls should suspect local personnel of removing these necessary items.