Brother International HL-720 Service Manual - Page 71
Poor fixing, toner cartridge id
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I-11 Poor fixing Possible cause Printing paper Toner sensing failure Fixing unit nip failure Thermistor failure Step Check 1 Is thick paper more than 36 lb. being used? 2 Is the problem solved by replacing the drum unit or the toner cartridge? (When printing is faint.) 3 Is the nip width in the fixing unit insufficient? Is the nip spring (P/R spring) unconnected? 4 Measure the temperature of heat roller surface during printing. Is the temperature correct (160°C)? Result Yes Yes Yes No Remedy Instruct the user to use paper of the recommended thickness. Toner is empty. As toner sensing is defective, clean the toner sensor. If the wiper of the toner cartridge id broken, replace the toner cartridge with a new one. Connect the spring or replace the fixing unit. Replace the fixing unit.
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