244. Assembly and Disassembly Procedures4.1 Assembly Procedures for B223PWL:Prepare a main board, a power board, and some essential cables. Connect every cable as the belowpicturePrepare a speaker and a MAINFRAME. And then assemble speaker to MAINFRAME. Put the cable throughthe hole as below picture remarked in yellow circle. Pull the speaker rubbers to fasten them as below picture.Turn over the circuit boards, use a Philips-head screwdriver to tighten six screws(remarked in red circles)till the power board and main board with MAINFRAME are firmly attached.S1S2S3