Sharp AE-Z40KR Service Manual page 32

AYZP40KR
No Item
.
4 Compressor check
5 Expansion valve check
6 Final check
2. Troubleshooting of outdoor unit electric components
NO
Does LED light?
YES
NO
Does LED flash?
YES
Normal
Check method
Measure compressor coil resistance
(for each phase of U, V and W).
Use multi-meter or digital tester capa-
ble of displaying two digits right of the
decimal point (0.01).
Measure expansion valve coil resis-
tance.
Turn off power, and connect compres-
sor cords to compressor.
Operate air conditioner.
Measure DC voltage between IPM
pins (31) and (35).
YES
Is 230 V applied Is voltage between
between 1 and IPM pins (31) and
N on outdoor (35) 320 V or
unit terminal higher?
board?
NO
Check indoor
unit.
Is switching power
supply output of
13 VDC, 15 VDC
produced?
Is 5 VDC output
produced?
Normal value/condition
Resistance value at 20C --- 0.65
Each phase 463 (at 20C)
Compressor should operate nor-
mally.
200 VDC or higher.
NO
5/ Short-circuit in DC fan motor
Short-circuit in IPM
Short-circuit in diode bridge
Blown fuse
Defective electrolytic capacitor
Wire disconnection, PWB pattern damage
YES
Short-circuit in PAM IGBT (Q5)
NO
Defective switching power supply circuit
Malfunction of 3-terminal regulator IC4, IC1
Short-circuit in expansion valve coil
Malfunction of transistor array IC7
Solder contact or other problems
YES
NO
Malfunction of 3-terminal regulator IC4, IC1
YES
Microcomputer oscillator error
Malfunction of microcomputer reset IC
Malfunction of microcomputer
Malfunction of serial signal circuit
Check wiring between indoor and outdoor units.
3 – 11
Remedy
Correct connections at compres-
sor terminals.
Replace compressor.
Replace expansion valve.
Replace control PWB.
Replace outdoor unit thermistor.
Replace compressor (in case of
compressor lock).