Select the required frequency.
Ident freq.
Adjust CDI until no deviation is displayed.
Does radial indicated match any fitted RMI needle, and does needle direction correspond with beacon location relative to your position on the airfield?
If so adjust CDI 10 degrees in each direction to check that beam bar goes to full scale deflection on both sides correctly. Then rotate CDI needle 360 degrees. Checking that after 90 degrees to/from flag changes and then changes back again as you reach the last 90 degree portion.