1) Remove the lead wires connected to operation switches SW-14 (RWD), SW-15 (F.FWD), and SW- 1 6 (FWD) from terminals (B1) {B4) and {B10) of the Operation Lamp P.C. Board.
2) Remove the multi-socket terminal [Ll2] lead wire connected to the System Control P.C. Board, and connect terminals [L12] and (B1).
3) Remove the multi-socket terminal [R8] lead wire connected to the System Control P.C. Board, and connect terminals [R8] and (B4).
4) Remove the multi-socket terminal [R2] lead wire and connect terminals [R2] and {B10).
5) Disconnect the various inner components (resistor, capacitor, diode, and transistor) of the Operation Lamp P.C. Board and directly connect Lamps IND-1 through IND-4.