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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 code = Toner Cartridge is missing or not installed properly. In rare cases it is a defective toner cartridge. Also double check the right side and front doors proper closure.
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CH code is usually associated with the Crum chip located on the back of the toner cartridge that gets 5 volts dc from the power supply and resets a counter on the main board to tell the copier approximatley how much toner you have when you insert an new toner. What may have happened, is the same 5 volts dc is shared with the laser unit and the when the laser goes bad it may cause the CH code just before it gives the E7-03 code for the laser due to the 5 volts being drawn down by the bad laser. If turning the machine off and back on with the new toner doesn't fix it then you either have a bad chip on the new toner or a bad LSU (laser Scanner unit)