TOKYO — When Olympus fired Michael Woodford, its British chief executive, in October, the company said he had been unable to conform to Japanese-style management.

Since then, Mr. Woodford has taken the decidedly non-Japanese step of publicly rebuking his employer and, by blowing the whistle on his own company, has done something rare for a chief executive anywhere in the world.

His allegations of billion-dollar malfeasance have set off investigations on three continents. Olympus has since acknowledged long-running efforts that it says were meant to hide steep financial losses. Now, Mr. Woodford is making his next unorthodox move.

On Friday he plans to return to Olympus headquarters for a board meeting, where he said he would demand that the entire board come clean on details of their actions and step down to take responsibility. (Because of a technicality, Mr. Woodford is still an Olympus director.)