Well Concertone contacted me and also sent me the owners manual for the RV2003L Concertone system. I am attaching it for anyone who may have the same system and may need the manual.
To set the clock without remote: Power off unit (time should display). Hold memory button and hour will flash. Press tuning buttons (up or down) to change the time. Press memory button again to go to minutes...again use tuning buttons to set minutes. When complete press memory again to save your setting and start the time.
Hope this helps someone...happy camping!!