─ 45 ─
No.
Symptom
Diagnosis method
Corrective action
6 Lossnay operation is
not correct for commu-
nication with the Wi-Fi
interface connected to
CN105 on the control
circuit board.
Check if connection with the Wi-Fi
interface is disconnected or loose.
Connect the Wi-Fi interface correctly.
Check that connector connection is
correct.
Connect the connector correctly.
(Refer to “5.2 External device connec-
tion use” in the Installation Manual.)
Check if Wi-Fi communication has an
error.
Check the Wi-Fi interface setting.
[3] Diagnosis of the power circuit board and DC motor
(Diagnosis of the electric components for failures caused by abnormal voltage or lightning strike)
When the product gets faulty due to abnormal voltage or lightning strike, it can be diagnosed in the follow-
ing procedures.
Components
Checklist
Power cir-
cuit board
1. Abnormal voltage or lightning strike can randomly damage the following elements:
• NR1
• NR3
• NR4
• NR5
• FUSE1
• FUSE2
• FUSE3
2. Other check points
• Check that the circuit name is correct.
(LG-X07DC-E2)
• Are any parts discolored to black?
• Is any liquid adhered to any parts?
• Are there any dead bodies of insects or small animals?
• Is the circuit board broken?
• Is the solder cracked?
• Checking the power supply indicator LED
LED6 is lit when power is supplied.
• Voltage check
With 15 V power supply, voltage at both ends of C30 should be 14 - 16 V DC.
• SA fan motor drive check
Voltage between pins 1 and 3 of CN10 should be 280 - 360 V DC.
Voltage between pins 3 and 4 of CN10 should be 14 - 16 V DC.
• EA fan motor drive check
Voltage between pins 1 and 4 of CN9 should be 280 - 360 V DC.
Voltage between pins 4 and 5 of CN9 should be 14 - 16 V DC.
Precaution
After disassembling the DC motor, it cannot be installed in the product again even if it has no failure.
(This is because the waterproof seal is broken to disassemble the motor.)
NR4
FUSE1
FUSE3
FUSE2
NR1
NR5
NR3
