Toshiba RAS-10SKX How to Check the PC Board, Operating precautions, Inspection procedures

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9-4-1. How to Check the PC Board

(1)Operating precautions

1)When removing the front panel or the PC board, be sure to shut off the power supply.

2)When removing the PC board, hold the edge of the PC board and do not apply force to the parts.

3)When connecting or disconnecting the connec- tors on the PC board, hold the whole housing. Do not pull at the lead wire.

(2)Inspection procedures

1)When a PC board is judged to be defective, check for disconnection, burning, or discolora- tion of the copper foil pattern or this PC board.

2)The PC board consists of the following 2 parts

a.Main PC board part:

Power relay, indoor fan motor drive circuit and control circuit, C.P.U. and peripheral cir- cuits, buzzer drive circuit and buzzer.

b.Infrared rays receive and indication parts:

Infrared rays receive unit and LED.

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Contents R C O Contents Primary Judgement of Trouble Sources Troubleshooting FlowchartsWhat to be Prechecked First Specifications RAS-10SK-E/10SA-E RAS-10SKX/10SAX CoolingCondition JIS C9612-1994 Temperature Cooling Construction Views Indoor UnitOutdoor Unit RAS-10SA-E RAS-10SAXWiring Diagram Main P.C. BoardSpecifications of Electrical Parts Parts name Type SpecificationsRefrigerant Cycle Diagram RAS-10SK-E / RAS-10SA-E RAS-10SKX / RAS-10SAXMICRO-COMPUTER Block Diagram AUTO, COOL, DRY, FAN onlyOperation Descriptions FAN only OperationCool Operation M3/hDRY Operation Louver ControlAuto Operation Temporary AutoCooling ECONO. ModeLow-Temperature Limit Control Cooling Operation How to Set the Auto Restart Auto Restart FunctionHow to Cancel the Auto Restart Case of Power Failure during the Timer OperationInstallation Procedure Safety Cautions For general public useUK Plugs and Sockets etc Safety Regulations SI Number Installation Diagram of Indoor and Outdoor Units AttachOptional Parts InstallationInstallation Parts Installation place Cutting a Hole and Mounting Installation PlateRemote control Mounting the installation plateWhen the installation plate is directly mounted on the wall Electrical WorkWiring Connection How to remove the front cabinetHow to open the screw cap Taking out the power cordStripping length of connecting cable How to install the front cabinet on the indoor unitPiping and Drain Hose Installation Case of rightward pipingCase of downward piping Left-hand connection with pipingIndoor Unit Installation DrainageStrong wind Refrigerant Piping Connection Vacuum PumpingFlaring Tightening connectionPacked Valve Handling Precautions A5 mm hexagon wrench is requiredAuto Restart Setting How to set the Auto RestartOthers Gas Leak TestTroubleshooting Chart Power Supply VoltageWhat to be Prechecked First Incorrect Cable Connection between Indoor and Outdoor UnitsMisleading but Good Operations Program Controlled Operation Operation of air-conditioner DescriptionBlock display Primary Judgement of Trouble SourcesRole of Indoor Unit Controller Self-diagnosis with remote control Selecting ordinary modeSelf-diagnosis by check codes Operating key Indication after operationCondition Code Status Preliminary checks Troubleshooting FlowchartsPower can not be Turned on No Operation at All Outdoor Unit does not Operate Power can not be Turned on after Replacing Indoor PC BoardChecking Procedure Only Compressor does not Operate Only Outdoor Fan does not Operate Check procedure Only the Indoor Fan does not OperateThere is no beep from How to Check the PC Board Operating precautionsInspection procedures Main PC board partProcedure Check Point Symptom Causes PC Board Layout Top View Bottom ViewHow to Reduce the Operation Time of the Anti-Restart Timer SensorPart Replacement Indoor Unit RAS-10SK-E, RAS-10SKXPart name Procedure Remarks Microcomputer RAS-10SK-E, RAS-10SKX Outdoor Unit RAS-10SA-E, RAS-10SAX OFF Exploded Views and Parts List Part DescriptionIndoor Unit Capillary Tube