18
Service Manual
Technical Information
5.3 Printed Circuit Board
Main board
7654321
10111415 13 12 9819 18 17 16
1 
Board  connection  wire 
interface needle 
6  Fuse    11
resistance-capacitor 
module 
16 
Outdoor tube 
temperature sensor 
2  Buzzer  7  Live wire copper insert 12 High fan speed interface  17 
Indoor ambient 
temperature sensor 
3  7805 regulated block  8  Transformer input port 13
Medium fan speed 
interface 
18 
Indoor tube 
temperature sensor 
4  Transformer outlet port  9  Piezoresistance    14 Low fan speed interface  19 
Board connection 
wire needle interface 
5  Compressor relay  10 
Neutral  wire  copper  
insert 
15 4-way valve interface  20     / 
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