I just picked up an HP-97. It works pretty good, except for the printer. It prints, but the results are very hard to read. The top and bottom rows of dots are OK, but the middle of the glyphs are dim. The effect varies from time to time--sometimes I can just make out what is being printed, sometimes it is so dim that I can't. I measured the resistances in the print head, and none seem to be open--they all measure about 11+ ohms.
Can anyone give me some advice? Do I need a new print head? A new printer? a new calculator? Anyone know of a source of parts for this thing?