AU-X095 - Sharp Air Conditioner Service Manual (repair manual). Page 26

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This filter absorbs the conduction noise and radiation noise transmitted to the power supply by the switching of the
IPM internal IGBT or DC-DC converter.

(2) Surge absorption circuit

This is a protective circuit to eliminate erroneous operation or damage to the air conditioner due to a surge of
lightning.

WPE1 is a protective fuse against the current flowing from the 220/240 V AC power source.

The 220/240 V AC undergoes full-rectification under diode bridge DB1.

This is a capacitor to smooth the voltage rectified by the diode bridge.

(5)  Fuse (WPE2)

A protective fuse on the main circuit in case the IPM or capacitor C3 breaks down. It is a 10 A fuse. If this fuse is
blown, the IPM and capacitor C3 are damaged. Check the control PCB carefully before replacing the fuse.

Capacitor C2 and C3 are for reducing the noise generated by the switching of the 380 V DC voltage.

This resistor is for discharging the charge on electrolytic capacitor C1 when the load side of the 380 V DC voltage
becomes in OPEN state.

The varistor protects the control circuit from a large surge such as lightning. When the surge is large, the varistor is
shorted, and the fuse blows. The varistor will also e broken. When this happens there will be a large crackling noise.
Replace the varistor and fuse.

SA1

WPE1

NR1

1

Terminal
Block

AC 220/240V

C7

C8

C5

C6

R2

L3

L2

AC 220/240V

DB1