14
2.  PCB MX PORT/PCB RS232C (AVR-2113CIE3 only) 
(1)  Remove the screws.
(2)  Disconnect the connector board.
TOP
 
COVER
BACK CHASSIS
→
PCB MX PORT (AVR-2113CI only)
→
PCB RS232C (AVR-2113CI only)
Proceeding : 
Shooting of photograph: A
Board to board
PCB MX PORT
PCB RS232C
Please refer to "EXPLODED VIEW" for the disassembly method of PCB MX PORT/PCB RS232C.