Adjusting R8 to Increase HP-97 Printer Intensity

[teenix]

(02-15-2021 03:11 PM)James Linder Wrote:  What are the possible cures for the printers in the desktops printing too
Lightly? I find that only a few of the dozen I own print dark enough. Thanks

Poor paper quality - age??.

Printer platen not holding the paper close enough to the print head.

Poor battery quality may affect this if it cannot supply the current required for the print heads.

Some sort of additional resistance in the print head ribbon cable connector or the connectors between the print circuit board and the main CPU board - corrosion??.

R8 (from the 97 service manual) can be adjusted to change the print intensity.

Over a range of calculators doing the same print problem, may suggest the battery.

cheers

Tony