AU-X095 - Sharp Air Conditioner Service Manual (repair manual). Page 8

8

HIGH or LOW is input to the CPU depending on whether or not each jumper line is connected. When the jumper line is
connected, the 5V becomes directly connected and the input becomes HIGH. If the jumper line is disconnected, the
input is pulled LOW by the internal pull-down resistor in the CPU port. The CPU receives this HIGH/LOW input and
switches its programming specifications accordingly.

The remote control sends a waveform composed of a carrier waveform and a signal waveform as an infrared signal.
The light receiver unit removes the carrier waveform leaving only the signal waveform and inputs it to the CPU.

LED 101 and LED 102 are lit by sending a LOW output from CPU IC1 pins 42 and 43. These LED's are lit when the unit
is in operation or when the timer is set.

+
–

5V

Light receiver unit

C9

C102

C101

CPU (IC1) pin 40

CPU (IC1) pin 41

R9

R10

5V

LED101

LED102

R11

CPU (IC1) pin 43

CPU (IC1) pin 42

5V

Jumper

CPU (IC1) 

Outdoor unit minimum frequency

       ––––

Model switch

Outdoor unit maximum frequency

       ––––

Model switch

       ––––

Wireless switch

Pre-heat function

 

Jumper

Yes

No

Up

                                 ––––

Cooler only

Down

                                 ––––

X075

                                 ––––

Switch

No pre-heat

Normal

Cooler/heater

Normal

  

X095

Normal

Pre-heat