Adjusting R8 to Increase HP-97 Printer Intensity

[Hans Brueggemann]

the printer's thermal compensation is pretty smart.
however, it doesn't hurt to check as to whether that resistor value is also good enough for a "long run print", say, a 200+ steps program print-out in MAN mode. along the print, the entire printhead gets more and more heated up, so it may happen that the final lines of your print-out are getting too dark. but then again, this is highly dependant on the type of thermal paper you are using.