On Thu, 29 May 1997 14:14:10 +0000 Chris Sakkas <chris@itutech.com>
writes:
>Are you sure it isn't the lamp?  This is typical with use.  You may
>want to see if your old parts still erase in 4 minutes!
>
Also, be sure to clean the chip window before erasing.  Fingerprints and
smudges of adhesive from old sticky labels may not look like much under
visible light, but they can block UV quite well.

-Mike