Carrier 42NQ009N Service Manual

Contents

− 54 −(3) Checking procedureFILE NO. SVM-10036defective.Table 9-6-1No.1234567Procedure1. Application of shock voltage.Overload by short-circuit of theparts.2. Poor contact of relay.Defective indicator, or poorhousing assembly. (CN14)1. The temperature of the indoorheat exchanger is abnormallylower.2. Poor contact of the heatexchanger sensor. (The connectoris disconnected.) (CN01)3. Heat exchanger sensor, mainP.C. board are defective. (Refer toTable 9-6-2 for the judgment ofdefective resistance values.)4. Main P.C. board is defective.1. The temperature of the heatexchanger is abnormally high.2. The heat exchanger sensorconnector has short-circuit. (CN01)3. The heat exchanger sensor isdefective. (Refer to Table 9-6-2for the judgment of defectiveresistance values.)4. P.C. board is defective.1. Poor contact of the motorconnector.2. P.C. board is defective.1. Is the fuse blown?1. Voltage of relay coil. (DC 12V)Between pin C of Q16 and GND2.Between No. 1 and 2 ofconnecting cable terminal block.(AC 220V ~ 240V)1. All indicators light for 3 sec..2. Indicators do not indicate normallyafter approximate 3 sec..1. Compressor does not operate.2. OPERATION lamp blinks.1. Compressor does not operate.2. OPERATION lamp blinks.1.Motor does not rotate. (The keyoperation is accepted.)2. The Motor rotates, but it vibratestoo much.Shut off the power supply andremove the P.C. board assemblyfrom the electronic parts base.Remove the connecting cable fromthe terminal block.Remove the connector for the motorand turn the power on.If the OPERATION lamp blinks(0.5 sec. : ON, 0.5 sec. : OFF) whenthe power turning on, the checkingpoints described as 1-4 of rightcolumn are not necessary toperform.Make the operation status bypushing once the ( )button, except the status of[FAN ONLY], [ON TIMER].Start the operation with the systemwhich the time of the restart delaytimer is shortened.Make the operation status bypressing once the ( )button.1. The time of the restart delay timeris shortened.2. Cool operation3. Air volume [AUTO]4. Make the setting temperature lowerenough than room temperature.5. Continuous operation.The status of No. 5 is continued, andmake the following condition.1. Heat operation2. Make the setting temperaturehigher enough than roomtemperature.Turn the power on after connectingthe motor connector. Start theoperation with the followingcondition.1. Operation [Cooling]2. Airflow [High fan]3. Continuous operationCheck Point (Symptom) Causes}1. • AC power cord is defective.• Poor contact of the terminal plate.• Miss wiring of the power relay.2. • Capacitor (C01, C02) is defective.• Line filter (L01) is defective.• Diode (DB01) is defective.3. IC04 is defective.4. M01, DB01, R319, C63 are1. Defective relay driver. (Q16)Voltage check1.Between 3 of RY01 and CN31(AC 220V; Thai model,AC 220 ~ 240V; Asian model)2.Between + and − of C63(DC 310 ~ 340V)3. Between 5V and GND4. Between 12V and GNDVoltage check,