Ricoh D131 Service Manual page 541

SC800: Overall System
Diagnostics command error (First machine)
Diagnostic command issued an error because Mandolin was not
detected, or there was a w/r/c error in the HDD register
[3014]
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SC823 B Self-diagnostics error: NIC
MAC address check sum error
The result of the MAC address check sum did not match the check sum
stored in ROM.
[6101]
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PHY IC error
The PHY IC on the controller was not recognized.
[6104]
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PHY IC loop-back error
An error occurred during the loop-back test for the PHY IC on the
controller.
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[6105]
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D131/D132/D133
Defective HDD device
Replace the HDD device.
Defective SEEP ROM
Defective I2C bus (connection)
Replace the controller board
Defective PHY chip
Defective ASIC MII I/F
Replace the controller board
Defective PHY chip
Defective MAC of ASIC (SIMAC/COMIC/CELLO)
Defective I/F with the PHY board
Defective soldered connection on the PHY board
Replace the controller board
2-74 SM Appendix