Great Manual. It was exactly what I was looking for
Text excerpt from page 3 (click to view)
SPP-N1020/N1021
Ver 1.1
NEW/FORMER TYPE DISCRIMINATION In this set with the following serial No. or later BASE MAIN and HAND MAIN boards have been changed. SPP-N1020 : Serial No. 0270853 or later SPP-N1021 : Serial No. A0114793 or later
NOTE FOR REPAIRING AND REPLACEMENT OF THE NEW TYPE BOARD When a new type board is damaged or out of order, do not repair that board, but replace with an former type board (BASE MAIN board : Part No. A-3062-659-A, HAND MAIN board : Part No. A-3062-658-A (N1020)/A-3062-742-A(N1021)). In this case, remove the EEPROM (BASE MAIN board : Ref No. U6, HAND MAIN board : Ref No. U4) from the new type board and install it on the former type board as a replacement.
