Multi F Four-Way Ceiling Cassette Service Manual

Part 5. Trouble Shooting

- 66 -

Only for training and service purposes

LGE Internal Use Only

Display

code

Title Cause of error Check point & Normal condition

AC Input current / Comp

phase current sensing cir-

cuit - basic vlotage sens-

ing error

• PCB sensing circuit part

burned

• Check power input connector, Comp output

current sensing circuit

Is AC input current

sensing part normal?

• Check voltage measurement

on the input current (Fig.1)

at the power-on standby

state DC 0V ± 0.2V

• Remedy : remove cause of error

• DC voltage measurement

at the measurement point in

figure 2 at power-on

standby state -> measured

value : within 2.5V ± 0.2V

• Remedy : remove cause of error

Is the Comp phase

Current sensor

part normal?

5V_GND5V_GND5V_GND

Input_I

5V_GND5V_GND5V_GND

Comp_Current

Recheck power

and installation condition

Yes

WARNING

Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state

of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.