AU-X095 - Sharp Air Conditioner Service Manual (repair manual). Page 2

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System Block Diagram(Indoor Unit AH-X075E/X095E, AY-X075E/X095E) ......................................... 3
Indoor Unit Control Circuit Operation ................................................................................................... 4
Power on Circuit ................................................................................................................................... 4
Power Supply Circuit ............................................................................................................................ 4
Reset Circuit ......................................................................................................................................... 5
Clock Waveform Forming Circuit .......................................................................................................... 6
Internal Osillator Circuit ........................................................................................................................ 6
Outdoor Power Supply Relay ............................................................................................................... 6
Serial Signal Circuit .............................................................................................................................. 7
Buzzer Circuit ....................................................................................................................................... 7
Light Reception Circuit ......................................................................................................................... 8
LED Circuit ........................................................................................................................................... 8
Specification Switching Circuit No. 1 .................................................................................................... 8
Specification Switching Circuit No. 2 .................................................................................................... 9
Test Input Circuit .................................................................................................................................. 9
Temperature Sensor Circuit ................................................................................................................. 9
Auxiliary Mode Circuit ........................................................................................................................ 10
Varistor and Fuse ............................................................................................................................... 10
Indoor Fan Circuit ............................................................................................................................... 11
Stepping Motor Circuit ........................................................................................................................ 12
CPU Port Allocation ........................................................................................................................... 13
System Block Diagram/Function Diagram(Outdoor Unit AU-X075E/X095E, AE-X075E/X095E) ...... 15
Outdoor Unit Control Circuit Operation .............................................................................................. 16
Model Switching Circuit ...................................................................................................................... 16
Internal Oscillator Circuit .................................................................................................................... 16
Reset Circuit ....................................................................................................................................... 17
Serial Signal Circuit ............................................................................................................................ 17
Outdoor Drive Circuit .......................................................................................................................... 18
Rotary Four-Valve Circuit ................................................................................................................... 19
Current Surge Suppression Circuit ..................................................................................................... 20
AC Current Detection Circuit .............................................................................................................. 21
Temperature Sensor Circuit ............................................................................................................... 22
IPM and PWM Drive Circuit ................................................................................................................ 22
IPM and Power Supply Circuit ............................................................................................................ 23
IPM and IPM Fault Detection Circuit .................................................................................................. 23
IPM and Active Filter .......................................................................................................................... 24
Test Mode Circuit ............................................................................................................................... 25
LED Circuit ......................................................................................................................................... 25
Inverter Circuit .................................................................................................................................... 26

(1) Noise filter circuit (AC) ............................................................................................................. 26
(2) Surge absorption circuit ........................................................................................................... 26
(3) Full-rectifier circuit .................................................................................................................... 26
(4) Smoothing condenser (CT) ...................................................................................................... 26
(5) Fuse (WPE2) ........................................................................................................................... 26
(6) Noise filtert circuit (DC) ............................................................................................................ 26
(7) Discharge resistor (R1) ............................................................................................................ 26
(8) Varistor (NR2) and fuse (WPE3) .............................................................................................. 26

CPU Terminal Allocation .................................................................................................................... 27