Chapter 1515-22<E602-XXYY>In case of XX=[20]T-15-6*: To clear the encryption key, go through the following in service mode (level 2): COPIER>FUNCTION>CLEAR>KEY-CLR. This operation makes HDD un-formatted status and if starting with that status, E602-0001 will be displayed. Thus, HDD format and system reinstallation via SST is required.XX YY Description Measures2000Authentication error between the hostmachine and the encryption board1. Remove/insert the encryption board and turn OFF/ON the power.2. After clearing the encryption key (*), execute HDD format and reinstallation of system via SST.01 If cannot recognize the encryption board 1. After clearing the encryption key (*), execute HDD format and reinstallation of system via SST.02Encryption board/HDD failure 1. Remove/insert the encryption board and turn OFF/ON the power.2. After clearing the encryption key (*), execute HDD format and reinstallation of system via SST.3. After replacing the encryption board, execute HDD format and reinstallation of system via SST.4. After replacing HDD, execute HDD format and reinstallation of system via SST.5. Replace LAN-bar-B PCB.6. Replace the main controller PCB (MAIN-M).