9-4-1. How to Check the PC Board
(1)Operating precautions
1)When removing the front panel or the PC board, be sure to shut off the power supply.
2)When removing the PC board, hold the edge of the PC board and do not apply force to the parts.
3)When connecting or disconnecting the connec- tors on the PC board, hold the whole housing. Do not pull at the lead wire.
(2)Inspection procedures
1)When a PC board is judged to be defective, check for disconnection, burning, or discolora- tion of the copper foil pattern or this PC board.
2)The PC board consists of the following 2 parts
a.Main PC board part:
Power relay, indoor fan motor drive circuit and control circuit, C.P.U. and peripheral cir- cuits, buzzer drive circuit and buzzer.
b.Infrared rays receive and indication parts:
Infrared rays receive unit and LED.
