Ricoh G188 Service Manual page 352

Service Call Conditions
No. Type
Self-diagnostic Error: RTC/optional NVRAM
The RTC device is not detected.
D
Replace the NVRAM with another NVRAM with an RTC device.
No. Type
CTL 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).
[0201]
1.
2.
3.
Resident memory error
The SPD values in all RAM DIMM are incorrect or unreadable.
[0202]
Replace the RAM DIMM.
G188/G189
Details (Symptom, Possible Cause, Troubleshooting Procedures)
RTC defective
NVRAM without RTC installed
Backup battery discharged
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Loose connection
Defective SDRAM DIMM
Defective controller
Turn the main switch off and on.
Replace the SDRAM DIMM.
Replace the controller.
Defective RAM DIMM
Defective SPD ROM on RAM DIMM
Defective 12C bus
3-56 SM Appendix