Lexmark C750 Service Manual - Page 133

5060-00x 943 Error code Black toner metering cycle (TMC) Toner metering cycle (TMC) is where the code and electronics in the printer sense an addition of toner in the cartridge developing area. If the printer is expecting a toner addition cycle but one is not detected, a 94x TMC Error is displayed. Replacement of the cartridge may fix the problem temporarily if the problem is with the printer. Only replace the cartridge if there are no problems with the printer or if the cartridge is known to be defective. Note: Before proceeding with this service check, observe the error log for repetitive occurrences of a 94x service error. Step 1 Actions and questions Check the toner metering cam (A) on the rear of the black cartridge. Note: In some cartridges the toner metering cam is black. the cam present on the cartridge? Yes Go to step 2 No If the toner metering cam is not present, check the printer to make sure it is not inside. Replace the damaged cartridge. A 2 Check the TMC pin (B) in the black cartridge contact assembly to make sure it moves freely. Go to step 3 Replace the cartridge contact assembly. B Does the pin move freely? Diagnostic information 2-99