AU-X095 - Sharp Air Conditioner Service Manual (repair manual). Page 25

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The LED is lit by setting CPU IC1 pin 63 to LOW output. It is inverted during serial signal reception, and flashes when
an error occurs.

The CPU< operation mode can be divided into the four types shown in the table below. Each mode can be selected by
connecting (a) and (b) in the diagram above to GND.

CPU (IC1) pin 58

R35

R36

R33

5V

R34

CPU (IC1) pin 59

a

b

Electrical burn-in mode

Individual board check mode

Air conditioner 40 Hz fixed mode

Normal operation mode

Yes

Yes

No

No

Yes

No

Yes

No

0 V

0 V

5 V

5 V

0 V

5 V

0 V

5 V

GND connection

CPU input

Operation Mode

a

b

58

59

CPU (IC1) pin 63

R31

LED

5V