I just started using my HP-41CX with external printer after being set aside for a long time. When I began printing recently, the characters were faint even though the intensity was set on normal to dark. The paper was very old, but the characters were generally well formed. As I printer the Catalog 3 a few times, the characters began to have white streaks in them. And now, the more I print, even with 3 different rolls of paper, the streaks are getting worse. While the characters are somewhat faint, because of the old paper, it is getting difficult to read them because of the increase/intensity of the streaks.
What causes the streaks, and what can be done to remove the streaks and improve the characters??
Thanks.