KFAS: Fanuc CNC Parts, Service, & Repair

Fanuc 31i-B Main PCB A1 A20B-8200-0720

Fanuc 31i-B Maintenance Manual

Connector number and their functions
COP10A-1, COP10A-2: FSSB interface
CA55                               : MDI
JD56A                             : I/O device interface (RS-232C)
JD36A                             : I/O device interface (RS-232C)
JA40                                : high-speed skip
JD51A                             : I/O Link i and I/O Link
CPD16A                         : power supply
JGM                                 : back panel
CA135                             : video signal interface
CA88A                             : memory card interface
CD46A                             : USB port
CK20A                             : horizontal soft key
CK21A                             : vertical soft key
CA132                              : inverter board
CD38A                             : Ethernet (Embedded Ethernet)
CD38B                             : Ethernet (Multi-function Ethernet)
TBL                                   : DeviceNet interface

If the LCD does not display anything, check the 7 segment status

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