Check SiBE04-624206 Service Diagnosis3.8 “Inverter Checker” CheckCheck No.14 1. CharacteristicsIf abnormal stop occurs due to compressor startup failure or overcurrent output when usinginverter unit, it is difficult to judge it results from the compressor failure or other failure (controlPC board, power transistor, etc.). The inverter analyzer makes it possible to judge the cause oftrouble easily and securely. (Connect this analyzer as a quasi compressor instead ofcompressor and check the output of inverter)2. Operation Method1) Be sure to turn the power off.2) Install the Inverter Analyzer instead of a compressor.Note: Make sure the charged voltage of the built-in smoothing electrolytic capacitor drops to 10VDC or below before carrying out the service work.ReferenceIf the connector terminal of compressor is not a faston terminal (difficult to remove the wire onthe terminal), it is possible to connect a wire available on site to the unit from output side of PCboard. (Do not connect it to the compressor at the same time, otherwise it may result in incorrectdetection.)3) Turn the power on and operate the air conditioner.3. Diagnose method (Diagnose can be made according to 6 LEDs lighting status asfollows:)(1) When all LEDs are lit uniformly, → Compressor malfunction (to be replaced)(2) When some of LEDs are not lit (LEDs are not lit or go off, etc.):Check the individual power transistor. (Refer to check No.15)∗ When the power transistor and control PC board are integrated :→ Replace the control PC board.∗ When the power transistor can be checked individually :↓ Check the resistance value. (Refer to check No.15)If NG : → The power transistor may have a failure. (Replace the power transistor).If the power transistor is normal, check if there is any solder cracking on filter PC board.∗ If any solder cracking is found: → Replace the filter PC board (or repair the solderedsection).∗ If filter PC board is normal: → Replace the control PC board.(1) Remove the faston terminalsfrom the terminal block ofthe compressor.(2) Connect the faston terminalsto the terminals of the InverterAnalyzer.Inverter AnalyzerBe careful not to touch the terminals(U,V,W)each other. Otherwise, high voltage isapplied.Compressor(R5160)
