IBM iSeries 270 Service Manual page 584

1. Power off the system, ensuring that no jobs are currently processing. See Power on/off the system and
logical partitions.
2. Choose from the following options:
v To set the mode of the card to Compressed (C), place the jumper on the top and middle pins.
v To set the mode of the card to Enhanced (E), place the jumper on the middle and bottom pins.
3. Select the IPL type and mode. See the iSeries Service Functions
information.
4. Power on the system.
For information on disk compression, see the Choose compression type page in the Backup and Recovery
topic in the iSeries Information Center.
Mode jumper has been overridden: For use by authorized service providers.
The error message CPPEA20 appears when the mode jumper has been overridden. This is due to cache
data that is in a conflicting mode.
1. To begin correcting this error, examine the mode jumpers in the rear section of the storage I/O card.
Note: The mode jumper is accessible without requiring the removal of the I/O card.
2. Choose from the following options:
v If the mode jumper is not in the desired position, follow the steps in Set or change the mode of an
I/O card.
v If the mode jumper is in the desired position and any other I/O card or device system reference
codes (SRCs) occurred at about the same time as this error, contact your service representative.
572
Hardware (Remove and Replace; Part Locations and Listings)