Msok - Samsung ProXpress M453x series Service Manual

2. Product Specifications and Description

2.9.2. MSOK

MSOK PBA consists of a EEPROM(512K-bit) that stores all the systems operation information such as system parameters,
device status, tech information, and service information which includes the device serial number.
NOTE
When a main board needs to be exchanged, the MSOK PBA should be re-installed to the new main board to retain the system
information.
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