Service manual

140
• TOP VIEW
Schematic Diagram
• BOTTOM VIEW
PIN PIN
1 22
2 23
3 24
4 25
5 26
6 27
7 28
8 29
9 30
10 31
11 32
12 33
13 34
14 35
15 36
16 37
17 38
IIC
18 39
IIC
19 40
20 41
21 42
1
2
3
4
5
6
7
8
9
10

Definition
Definition
Indoor unit pin definition
Ground
Reset input
Ground
Buttons input
Buzzer output
Relay control
Communication sending
Communication receiving
Remote control receiving
Reset output
PWM output
5V power supply Vcc
AD referrence voltage
AD referrence ground
Motor feedback input
Surge signal input
Surge singal output
Serial No.
Name of circuit Testing contents
Communication circuit
Stabilized voltage supply circuit
Buzzer circuit
Commutating filter wave circuit
Displaying board displaying circuit
Reset circuit
Jumper cap ciruit
Crystal oscillatory circuit
Buzzer sound
Communication voltage and communication wave shape
Displaying the numerical design correctness
Sensor detection temperature circuit
Input IC pin voltage value
Waveform and voltage
Reset pin voltage and waveform
Impulse waveform and impulse voltage
Fan motor feedback and
driving circuit
Whether jumper cap is installed or whether it is correctly
installed
Chip power supply 5V; relay power supply 12V
Before commutating, voltage:
AC current; After commutated, voltage: DC current
Note: unnoted that the pins are suspending
Display board code control S1
Display board code control S2
Display board code control S3
Display board code control S4
Retain the swing motor control
Pin1 in advance
Retain the swing motor control
Pin2 in advance
Retain the swing motor control
Pin3 in advance
Retain the swing motor control
Pin4 in advance
Upper and lower swing motor control Pin 1
Upper and lower swing motor control Pin 2
Upper and lower swing motor control Pin 3
Upper and lower swing motor control Pin 4
Cooling/heating selection port
Display board code control G
Display board code control F
Display board code control E
Display board code control D
Display board code control C
Display board code control B
Display board code control A
Bus data port
Bus clock port
Indoor ambient temperature sampling port
Indoor tube temperature sampling port
Quick test port (retain the temperature
sampling port)