Ricoh Aficio 480W Dolphin-C2 Service Manual page 241

SP (SERVICE PROGRAM) MODE TABLES
4991 Read Shading DFU
These SP codes are debugging tools. If the peaking shading data (RI110) read at
power on is less than 64 digits, this information is stored in NVRAM.
001 Ech
002 Och
Reads EVEN shading data and stores it if an error occurs.
Reads ODD shading data and stores it if an error occurs.
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28 April 2005