Service manual

142
• TOP VIEW
Schematic Diagram

1
2 PFC
3
4
5 PTC
6
7
IPM
˖ 15V
8
9
10
11
12
Serial No. Name of circuit
Testing spot
Testing content
Commutating filter circuit
circuit
Indicator circuit
Fan motor’s four-way valve
control circuit
Current of power on testing
circuit
Strong current filter cuircuit
Output voltage:12V
temperature
Voltage of R101 both sides
Switch power supply circuit
Compressor driving circuit
Sensor detecting
temperature circuit
Crystal oscillatory circuit
Reset circuit
Communication circuit
Bus bar voltage, working voltage 15V
Indicator on/off times
Chips power supply:5V
Chips power supply: 3.3V
Waveform and voltage
Communication sending singal detection
Normal value: in this point, there is inerratic
change for voltage
Communication receiving signal detection
Normal value: in this point, there is inerratic
change for voltage
Input IC pin voltage value
Bus bar voltage
The normal value is
power supply voltage X1.42
Before commutating voltage AC current;
After commutating voltage DC current
After filtered the waves, the voltage AC normal
value is power supply voltage
R212 underneath
multimeter black pen contact
with U406 radiator
multimeter red pen contact
with R212 underneath
R407right side
multimeter black pen contact
with U404 radiator
multimeter red pen contact
with R407 right side
The pen of multimeter
red meter contacts with
D304 negative port
The pen of multimeter
red meter contacts with
C405 underneath
The pen of multimeter
red meter contacts with
Pins 7,8 of U4
The pen of multimeter
black meter contacts
with U404 radiator
R201 left side
The pen of multimeter black meter
contacts with U404 radiator
The pen of multimeter red meter
contacts with R201 right side
R407 right side
The pen of multimeter black meter
contacts with U404 radiator
The pen of multimeter red meter
contacts with R407 right side
Both sides of R3
The pen of multimeter black meter
contacts with U404 radiator
The pen of multimeter red meter
to test the upper side and lower
side voltage of R3
C17 underneath
The pen of multimeter black meter
contacts with U404 radiator
The pen of multimeter red meter
contacts with C17 lower side
C503 underneath
The pen of multimeter black meter
contacts with U404 radiator
The pen of multimeter red meter
contacts with C503 underneath
C524 underneath
The pen of multimeter black meter
contacts with U404 radiator
The pen of multimeter red meter
contacts with C524 underneath
Reset voltage and wave
normal value: once power on, instantly there is 200 millisecond
lower voltage, after that is 3.3V all along