Ricoh MP1900

• Code: 621
• Description: ADF connection error
  An incorrect ADF (an ADF for some other copier) is detected.
• Causes: ADF incorrect (The ADF for B039/B040/B043 or B121/B122/B123 is installed on this machine.)

• Code: 760
• Description: ADF gate abnormal 1
  The ADF Gate signal line between the ADF main board and the BICU is disconnected.
• Causes: - ADF main board defective
  - Input/output board defective
  - Poor connection (ADF Gate line) between the
  - ADF main board and the BICU.

• Code: 761
• Description: ADF gate abnormal 2
  The FGATE signal is not issued from the ADF within 30 seconds after the ADF starts feeding.
• Causes: - ADF connector defective
  - SBU board defective

• Code: 762
• Description: ADF gate abnormal 3
  The FGATE signal is not terminated by the ADF within 60 seconds after the ADF starts feeding.
• Causes: - ADF connector defective
  - SBU board defective

• Code: 901
• Description: Mechanical total counter
  The mechanical total counter does not work properly.
• Causes: - Mechanical total counter defective
  - BICU defective
  - Disconnected mechanical total counter

• Code: 903
• Description: Engine total counter error
  The checksum of the total counter is not correct.
• Causes: - NVRAM on the BICU defective