Air-Con ACZCI4C4R18, Service Manual

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Installation and Maintenance
Service Manual
●Discharging method
(1) remove the inverter cover(Outdoor Unit)
(2)As shown below,connect the discharge resistance(approx.100Ω20W)or plug of the sold ering iron to voltage b - terminals of
the electrolytic capacitor (test3 “D ” and “E” point) on PC Board for 30s, and then peformedischarging.
NOTE:
A large-capacity electrolytic capacitor is used in the outdoor unit controller(inverter).Therefore,if the power supply is turned
off,charge(charging voltage DC280V to 380V)remains and disc harging takes a lot of time.. After turning off the power source,if touching
the charging section before discharging, an electrical shock may be caused. Discharge the electrol ytic capacitor completely by using
soldering iron,etc.
P.C.board
(Soldered surface)
Inverter cover
Test point No. Test point Related elements
Test value under normal condition
Test 1 Between A and C
Neutralwire, live wire
160V-265V
Test 2 Between B and C
Neutralwire, live wire
160V-265V
Test 3 Between D and E Electrolytic capacitor of DC bas bar DC 180V-380V
Test 4
Between F and G Electrolytic capacitor ofswitch power
DC 180V-380V
Test 5
Both ends of diode D10 D10 (IPM 15V)
DC 14.5V-15.6V
Test 6
Both ends of electrolytic capacitor C40
C40 (+12V power) DC 12V-13V
Test 7
Both ends of electrolytic capacitor C82
C82 (+5V power) DC 5V
Test 8
Both ends of electrolytic capacitor
C225
C225 (+3.3V power) DC 3.3V
Test 9 Between S and T
Communication circular current
DC 56V
Test 10
Between point N and GND
R78 to N terminal (ground) (signal
receiving terminal of outdoor unit)
Jumping between 0V and 3.3V
Test 11 U12
Between 1 and 2 at leading foot of
U12
Jumping between 0V and 3.3V
Test 12
Between point M and GND
R75 to M terminal(ground) (signal
sending terminal of outdoor unit)
Jumping between 0V and 3.3V
Test 13 U15
Between 3 and 4 at leading foot of
U15
Jumping between 0V and 3.3V