Repairing GE Oven

Hello

I have a 1992 GE Combo microwave and oven unit. I cannot find a model number anywhere for the oven. The microwave has the following information located inside the unit:

Model: JKP64GOP1BG
Series: FG638498Q

My oven has a F4 fault code on the keypad and the keypad is unresponsive.

I cannot locate the parts on your site, beacuse I cannot find the oven model number. Can you help? Also, do you have diagram for replacing parts needed?

Thanks
DES