(No.MA161)1-133.1.8 Removing the main board(See Figs.14 and 15)• Prior to performing the following procedure, remove the frontpanel assembly, heat sink and top chassis assembly.(1) From the rear side of the bottom chassis assembly, removethe screws M and N attaching the rear bracket to the bot-tom chassis assembly. (See Fig.14)(2) From the top side of the bottom chassis assembly, removethe four screws P attaching the main board to the bottomchassis assembly. (See Fig.15)(3) Release the stopper of the connector CN751 on the mainboard in an upward direction, disconnect the card wire fromthe connector CN751. (See Fig.15)(4) Disconnect the wire from the connectors CN391 andCN705 on the main board. (See Fig.15)Reference:After connecting the wires, fix the wires with the wireholder.(5) Take out the main board from the bottom chassis assem-bly.Fig.14Fig.15Rear bracketM NCN751CN705CN391 Main boardWire holderP