Ricoh D017 Service Manual page 416

826 D Self-diagnostic Error: RTC/optional NVRAM
The one second counted by the RTC is different from the one second
counted by the CPU on the controller.
[1501]
Defective the RTC device
Replace the RTC device..
The RTC device is not detected.
Defective RTC device
[15FF] NVRAM without RTC installed
Discharged backup battery
Replace the NVRAM with another NVRAM with an RTC device.
Self-diagnostic error: Standard SDRAM DIMM
827 D
[XXXX]: Detailed error code
Verification error
Error detected during a write/verify check for the standard RAM (SDRAM
DIMM).
Loose connection
[0201]
Defective SDRAM DIMM
Defective controller
Turn the main switch off and on.
Replace the SDRAM DIMM.
Replace the controller.
SM Appendix 3-41 D017/D018/D019/D020/D084/D085
Service Call Conditions