• Code: SC42-17
• Description: The blowout of ICP for the polygon cooling fan (FM9) in the AC drive board (ACDB) is checked. An abnormal condition occurs with the FM9 EM signal a specified period of time after FM9 turns ON. This abnormal condition recurs even a specified period of time after FM9 is turned OFF and then turned ON, and an error detection signal (blowout of ICP) is detected.
• Causes: DC power supply /2 (DCPS2) AC drive board (ACDB) Polygon cooling fan (FM9) Wiring harness broken Loose connection

• Code: SC42-18
• Description: The rotation of the polygon cooling fan (FM9) is checked. An abnormal condition occurs with the FM9 EM signal a specified period of time after FM9 turns ON. This abnormal condition recurs even a specified period of time after FM9 is turned OFF and then turned ON, and an error detection signal (24V cut off/ blowout of ICP) is not detected.
• Causes: DC power supply /2 (DCPS2) AC drive board (ACDB) Polygon cooling fan (FM9) Wiring harness broken Loose connection

• Code: SC42-19#
• Description: When the print is started, an error detection signal of the polygon cooling fan (FM9) is detected.
• Causes: DC power supply /2 (DCPS2) AC drive board (ACDB) Polygon cooling fan (FM9) Wiring harness broken Loose connection

• Code: SC42-20
• Description: Power supply cooling fan /1 (FM19) and /2 (FM20) rotation check. A specified period of time after FM19 and FM20 turn ON, the FM19 EM signal and the FM20 EM signal get into an abnormal condition at the same time. And both the signals show an abnormal condition at the same time a specified period of time after they are turned ON again after being turned OFF, and also, no error detection signal (24V cut off/ blowout of a fuse) is detected).
• Causes: DC power supply /1 (DCPS1) Power supply cooling fan /1 (FM19) Power supply cooling fan /2 (FM20) Wiring harness broken Loose connection

• Code: SC42-21
• Description: Paper exit cooling fan /Lw1 (FM13) and /Lw2 (FM14) rotation check. A specified period of time after FM13 and FM14 turn on, the FM13 EM signal and the FM14 EM signal get into an abnormal condition at the same time. And both the signals show an abnormal condition at the same time a specified period of time after they are turned on again after being turned off, and also, no error detection signal (24V cut off/ blowout of ICP) is not detected.
• Causes: DC power supply /2 (DCPS2) Printer control board (PRCB) Paper exit cooling fan /Lw1 (FM13) Paper exit cooling fan /Lw2 (FM14)

• Code: SC42-22
• Description: Paper exit cooling fan /Up1 (FM15) and /Up2 (FM17) rotation check. A specified period of time after FM15 and FM17 turn on, the FM15 EM signal and the FM17 EM signal get into an abnormal condition at the same time. And both the signals show an abnormal condition at the same time a specified period of time after they are turned on again after being turned off, and also, no error detection signal (24V cut off/ blowout of ICP) is not detected.
• Causes: DC power supply /2 (DCPS2) Printer control board (PRCB) Paper exit cooling fan /Up1 (FM15) Paper exit cooling fan /Up2 (FM17)

• Code: SC46-01
• Description: While in the image write, APC is not applicable for the correction of the sub scan beam. Due to the 12V DC power for the laser drive not supplied, the MPC being wrong and the laser defective, the laser does not light up. Also, due to the rotation of the polygon mirror unavailable, the displacement of the index sensor, and the index sensor being defective, the index sensor cannot detect the laser.
• Causes: Writing section Power connector of the overall control board (OACB)

• Code: SC46-02
• Description: FIFO address abnormality for the scanner. While in the image read, the compression of image data that is read in is not correctly terminated.
• Causes: Overall control board (OACB) (Gate array damaged)