How are you connected to the printer ?
If it is ethernet like mine then do this.
install:
Ghostscript,
Foomatic,
Pxlmono
Get into your printer set up page
(click top left apple on your screen, select system preferences, select Print and scan,

Next click on the "+" to add a printer (bottom left corner).
Select the IP
Type in your address (eg 192.168.26.345)
Leave the Protocol as it is (only change it if this doesn't work).

Once you type in your address it will come up with your driver, DON'T use it.
instead go to the arrows at the end of the box and click on Select printer software.
Scroll down until you find the one that says Ricoh Aficio MP C2500 PXL.
I know it's not your number but it's the one you need.
Click Apply and there you have it.
Hope this works for your problem