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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.
Power off the machine, switch on while pressing 0 & 8, enter 200, then press the start button, the machine will run for about three minutes to adjust the Toner sensor. The machine will stop, press the interupt button to save the setting, switch off and then on.
If the older techies is reading this, please help to confirm.
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.