have a HP PSC 1600 printer. was printing a thermostat manual and the printing is sporadically not readable.
It was ok THE FIRST FEW PAGES and then got spotty, although its mostly with smaller printing parts.
My immediate guess was the black ink is running low, but i seem to remember a printer or 2 ago it had something to do with the driver or something weird like that.
But then I hate to toss even a black ink cartridge if it is still good!
Any ideas?