Causes: Optical axis shift. Reduced laser power, lighting error, laser diode trouble. Harness and connector trouble between the LD(MY) PWB and the LSU cnt PWB.
Remedy: Use SIM61-1 to check the operation of the LSU. Check the PWB and connection of the harness in the LSU. Replace the LSU.
Code: E7-28
Description: LSU-MFP connection error
Causes: Communication error between the CPU in the MFP PWB and the control ASIC. Improper connection of the communication connector between the MFP PWB and the LSU cnt PWB. Harness trouble between the MFP PWB and the LSU cnt PWB MFP PWB or LSU cnt PWB trouble
Remedy: Check connection of the connector and the harness between the MFP PWB and the LSU cnt PWB. Replace the LSU PWB. Replace the MFP PWB.
Code: E7-29
Description: LSU ASIC frequency error
Causes: Oscillation abnormality of the external oscillator and the internal oscillating circuit used in the LSU ASIC. LSU ASIC abnormality on the LSUcnt PWB.
Remedy: Check connection of the connector and the harness between the MFP PWB and the LSUcnt PWB. Replace the MFP PWB. Replace the LSU.PWB.