Indicates if any of the sub-systems in the printer are
not ready. A sub-system is not ready if the sub-system
is unable to perform its function until some sort of
intervention occurs. If there are no items in the NOT-
READY-PRINTER collection (i.e. no bits are set), then
all printer sub- systems are ready. Each sub-system has
a sub-system specific not ready object. If a sub-system
specific not ready object contains any items, then the
associated item will be in the NOT-READY collection.