CHECH AND TEST 1

Step 1

Unscrew cover of mainboard with a Cross-head screwdriver.

Step 2

Power on the appliance, open freezer door and heat freezer temp. sensor.

Step 3

Use multimeter to measure the voltage of output for “FAN+” & “GND”.

Take note of the measured result.

DIAGNOSIS 1


CHECK AND TEST 2

Step 1

Open fridge door and heat fridge temp. sensor.

Step 2

Press down mechanical switch

Step 3

Attach detecting hook to wires after stripping sleeves, use an oscilloscope to measure signal for damper between “A+” & “B+” or “A-” & “B-”

Step 4

Observe the signal
for five seconds after opening or closing the door. Check if there is a square waveform output.

DIAGNOSIS 2


PROCEDURE 1


Step 1

Disconnect terminals.

Step 2

Pull out earthing wires.

Step 3

Unscrew the mainboard.

Step 4

Pull out the buckle to remove the mainboard.

Reverse steps above to install a new mainboard.

CHECK AND TEST3

Step 1

Power on the appliance, open fridge door and heat fridge temp. sensor.

Step 2

Press down mechanical switch

DIAGNOSIS 3