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Hope you are fine, ch are in two forms steady one and the blinking ch. Steady CH This is associated with door switch for either front cover or side cover. Check that the front cover of the copier and the right side is well closed. Blinking CH This is associated with the toner cartridge or the developer unit not being sensed by the machine. Make sure that the developer unit is well locked in the machine. Pull out the toner cartridge and insert back with some force into the machine, it should clear this sign. If it does not, replace a new cartridge Sharp Ar016ft and you are done. Good luck.
CH - open cover in the paper feed area
CH blinking - Dev unit is not properly
For the 'CH' check the covers and make
sure all covers are closed properly.
For the 'Blinking CH' take the dev.
Unit open and the reinstall unit properly.
Pls rate – thank you
Is "CH" steady or flashing? If it's steady, the door is not shut properly. If it's flashing, the machine doesn't detect the presence of the toner cartridge (defective toner cartridge). Try another toner cartridge (an empty cartridge will do).
To get the blue handle to stay locked sometimes takes fiddling with it when the cartridge is in.