Xerox 7142 Service Manual page 266

9 Troubleshooting
Table 9-6 Symptoms and Check Items for CPU System Serious Errors(Continued)
No. Message
20 E 129 error
NVRAM
NOTE
For the PC settings, refer to your PC's operation manual.
Event/ Check item
symptom
Abnormal Main board assembly
condition in may be defective.
NVRAM in
main board
assembly that
memorizes
product
settings.
RJ-901C/RJ-900C Maintenance Manual
Replace main board
assembly.
9-22
Action Reference
"4.3.3
Replacing
Main Board
Assembly"
p.4-21