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C7 could be nothing serious but it had to of happened three times before it quit resetting itself, which means it has happened to you before. This model has a tendency to throw this code for no real threatening reason, but it is there as protection for the copier and it's environment. You really should have a tech look at it for you, and not just reset it.
Switch on the machine, holding down 0 & 8 buttons, type in 89, press the green button, enter a 0, press green button again to accept the new value. switch off & then just switch back on as normal.
You can reset the C7 code, hold down 0&8 power machine up. Then push 87 & print, change the number to 0 with number keys press interupt key, then press 0&9 @ the same time to exit. This should clear the C7. Let me know if you need more help.