Lexmark C782 Service Manual - Page 104

5061 Step 9 10 Actions and questions Check the voltage at connector J6-16 when the yellow TMC switch is pressed. Does the voltage measure approximately +3.3 V dc? Check the developer HVPS to system board cable for damage, broken connections, or wire and shorts between adjacent pins. Are there any signs of damage to the cable? 11 Disconnect the developer HVPS cable from connector J6 on the system board. Measure the voltage on connector J6-16 on the system board. Does the voltage measure approximately 0 V dc? Yes Go to step 10 Replace the cable. Replace the system board. See "System board removal" on page 4-89. No Go to step 11 Replace the developer HVPS board. See "Developer HVPS board removal" on page 4-39. Replace the developer HVPS and developer HVPS to system board cable. 943.xx error code service check • 943.01-black toner metering cycle (TMC) problem • 943.05-black TMC timeout problem 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 Actions and questions 1 Check the toner metering cam (A) on the rear of the black cartridge. Note: In some cartridges, the toner metering cam is black. Is 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 2-62 Service Manual