The Xerox WorkCenter XD103f

Question

I installed a stripped fussier gear of the copier. When I turned the copier on, I ran into another problem. The copier started flashing H and 4 alternatively. I am experiencing almost a complete short-down as the copier does not respond to any control. The start button does not show any light. How can I fix this problem. I appreciate your suggestions.

Nkem.