• Code: 900
• Description: Electrical total counter error
  The electrical total counter does not work properly.
• Causes: • NVRAM defective

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

• Code: 921
• Description: IMB memory controller error
  A memory control job is not completed within a certain period.
• Causes: • IMB defective • BiCU defective • Poor connection between IMB and BiCU

• Code: 922
• Description: IMB DRAM error
  The machine detects a discrepancy in the IMB DRAM write/read data during its write/read test (done at power off/on and at recovery from low power or night/off mode).
• Causes: • IMB defective • BiCU defective • Poor connection between BiCU and IMB

• Code: 924
• Description: Optional DRAM error
  The machine detects a discrepancy in the Optional DRAM write/read data during its write/read test (done at power off/on and at recovery from low power or night/off mode).
• Causes: • Non-supported DRAM connected • Poor connection between IMB and optional DRAM • Optional DRAM defective • IMB defective • BiCU defective

• Code: 925
• Description: IMB non-connected error
  IMB is not connected. This SC only appears with B040 and B043 version machines.
• Causes: • IMB is not connected • Poor connection between BiCU and IMB • IMB defective • BiCU defective

• Code: 926
• Description: Memory capacity error
  The machine detects a discrepancy between the memory capacity detected during the memory check at power on and the check at recovery from low power or night/off mode.
• Causes: • Poor connection between optional DRAM and IMB • Optional DRAM defective • IMB defective • BiCU defective

• Code: 981
• Description: NVRAM error
  The machine detects a discrepancy in the NVRAM write/read data when attempting to save actual data to the NVRAM (i.e. during actual use).
• Causes: • NVRAM defective • Poor connection between BiCU and NVRAM • NVRAM is not connected • BiCU defective