• Code: SC624
• Description: Mailbox-to-copier communication error
  Communication between the mailbox and copier is interrupted. An ACK/NCK signal was not received within 100 ms after a data frame is sent and 3 retries failed.
• Causes: • Mailbox cable disconnected, defective • Mailbox main board defective • VBCU defective • PSU defective

• Code: SC625
• Description: VBCU-DTMB (DMC1) communication error
  Communication between the VBCU and DMC (main) was interrupted. An ACK/NAK signal was not received within 100 ms after a data frame was sent and three retries failed.
• Causes: • Check the DTMB harness connections at the DTMB and VBCU • DTMB defective • PSU defective • VBCU defective • 5V power supply defective

• Code: SC626
• Description: VBCU-DTMB (DMC2) communication error
  Communication between the VBCU and DMC (sub) was interrupted. An ACK/NAK signal was not received within 100 ms after a data frame was sent and three retries failed.
• Causes: • Check the DTMB harness connections at the DTMB and VBCU • DTMB defective • VBCU defective • PSU defective

• Code: SC627
• Description: VBCU-DTMB (TMC) communication error
  Communication between the VBCU and TMC was interrupted. An ACK/NAK signal was not received within 100 ms after a data frame was sent and three retries failed.
• Causes: • DTMB harness loose, broken, defective • DTMB defective • VBCU defective • PSU defective

• Code: SC636
• Description: SD card error
• Causes: • There is no expanded authentication module in the machine. • The SD card is damaged or the authentication module is corrupted. • There is no DESS module in the machine.

• Code: SC641
• Description: Engine-Controller Communication Error: No Response
  There was no response to a frame sent from the controller board to the engine.
• Causes: • Cycle the machine off/on.

• Code: SC670
• Description: Engine start failure
  The engine did not respond within 30s after power on, or the engine went down suddenly at power on or during warm up because a communication reset occurred between the VBCU and the controller.
• Causes: • VBCU installed incorrectly • VBCU defective

• Code: SC671
• Description: Incorrect board detected
  An illegal engine board was detected at power on.
• Causes: • Replace BICU