Well I tried the above process and I am still hosed with my PSC 2175 all-in-one printer.
Symptoms:
1. printing a straghtforward A4 page scales it by 50% (quarter area).
2. Using filters from kprinter for things like pamphlet printing produces a *really* tiny page and lots of lines.
Setting the print quality to draft as per
https://bugs.launchpad.net/hplip/+bug/392040
solves (1) above, but not (2).
Does anyone know how to resolve this?
In the meantime, I will attempt to go back to the installation DVD and re-install the original hplip stuff. Sigh.