How to fix sharp error code F2-40 and maintenance code TA error location MX-M265NE  

MX-M264N MX-M314N MX-M315N MX-M354N
Error code: F2-40
New toner cartridge replacement. Toner density sensor trouble
Toner density sensor output abnormality. Sensor connector and harness connection trouble. Developing unit trouble. PCU PWB trouble.
Replace the toner density sensor. Check connection of the sensor connector and the harness. Replace the developing unit. Replace the PCU PWB.
All error codes
A0-01 A0-02 A0-04 A0-10 A0-11 A0-15 A0-20 A0-21 A0-22 E7-01 E7-03 E7-04 E7-07 E7-10 E7-11 E7-14 E7-20 E7-21 E7-28 E7-49 E7-50 E7-55 E7-60 E7-61 E7-65 E7-80 E7-90 E7-91 E7-92 E7-93 E7-94 E7-96 EE-EL EE-EU F1-00 F1-03 F1-10 F1-15 F1-19 F1-20 F1-29 F1-37 F1-50 F1-95 F2-39 F2-40 F2-58 F2-64 F2-70 F2-74 F3-12 F3-22 F3-32 F3-42 F6-00 F6-01 F6-04 F6-21 F6-30 F6-97 F6-98 H2-00 H2-01 H3-00 H3-01 H4-00 H4-01 H5-01 L1-00 L3-00 L4-01 L4-11 L4-30 L4-31 L4-32 L4-35 L4-43 L4-44 L4-56 L6-10 L8-01 L8-02 L8-20 P1-00 P1-01 P1-02 PC-- U1-01 U2-00 U2-05 U2-10 U2-11 U2-24 U2-30 U2-40 U2-41 U2-42 U2-50 U2-60 U2-80 U2-81 U2-90 U2-91 U7-50 U7-51 UC-02 UC-20 F2-40
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