Hitachi RAS-60YH5 - Check the Main P.W.B (Power Circuit)

Hitachi RAS-60YH5

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– 103 –

6. Check the main P.W.B (power circuit)

Table of Contents

Table of Contents1
Specifications1
Service Manual1
Technical Information1
Room Air Conditioner1
Safety During Repair Work2
Working Standards for Preventing Breakage of Semiconductors3
Conductive Container3
Body Earth3
Grounding of the Working Table4
Grounding a Soldering Iron4
Specifications6
- Installation of Indoor and Outdoor Unit7
- Precautions During Installation8
- Safety Precautions8
- Names and Functions of each Part10
- Product View10
- Model Name and Dimensions10
- Indoor Unit Indicators11
- Operation Indicator11
- Temporary Switch11
- Names and Functions of Remote Control Unit12
- Automatic Operation13
- Auto Restart Control13
- Heating Operation14
- Dehumidifying Operation15
- Cooling Operation16
- Fan Operation17
- Fan Speed (Auto)17
- How to Cancel Reservation18
- How to Set the Timer18
- How to Set the Sleep Timer20
- Adjusting the Air Deflector21
- How to Exchange the Batteries in the Remote Controller22
- The Ideal Ways of Operation23
- Suitable Room Temperature23
- The Air Conditioner and the Heat Source in the Room24
- Not Operating for a Long Time24
- When Lightning Occurs24
- Interference from Electrical Products24
- Attaching the Air Cleansing and Deodorizing Filters25
- Maintenance26
- Air Filter Cleaning26
- Washable Front Panel27
- Maintenance at Beginning of Long off Period28
- Regular Inspection28
- The Recommended Maximum and Minimum Operating Temperatures29
Construction and Dimensional Diagram30
- Thermostat Specifications32
- Fan Motor Specifications32
Main Parts Component32
Compressor Motor Specifications33
Wiring Diagram34
Circuit Diagram35
Printed Wiring Board Location Diagram38
Block Diagram39
Basic Mode40
- Mode Data File41
- Basic Cooling Operation42
- Cooling Defrost43
- Cooling Sleep Operation43
- Dehumidifying44
- Basic Heating Operation45
- Reversing Valve Defrosting46
- Heating Sleep Operation46
- Setting Defrosting Inhibit Period46
Refrigerating Cycle Diagram47
- Auto Swing Function48
- Reset Circuit49
Description of Main Circuit Operation49
- Receiver Circuit50
- Buzzer Circuit50
- Buzzer Operation50
- Auto Sweep Motor Circuit51
- Auto Sweep Motor Rotation51
- Room Temperature Thermistor Circuit52
- Heat Exchanger Temperature Thermistor Circuit52
- Initial Setting Circuit53
- Power Circuit54
- Indoor/Outdoor Interface Circuit56
- Voltages Waveforms of Indoor / Outdoor Microcomputers58
- Outdoor Message60
- Indoor Message60
- Power Module Circuit61
- Switching Order of Power Module62
- Voltage Waveform at each Point62
- Power Circuit for P.W.B.64
- Reversing Valve Control Circuit66
- Rotor Magnetic Pole Position Detection Circuit67
- Drive Circuit68
- Low Speed Rotation Mode69
- High Speed Rotation Mode69
- HIC and Peripheral Circuits70
- Overload External Judgement Circuit72
- Voltage Amp. Circuit73
- Temperature Detection Circuit75
- Outdoor DC Fan Motor Control Circuit77
- Power Factor Control Circuit79
- Service Call Q and a80
- Precautions for Checking83
Trouble Shooting83
- Discharge Procedure and Power Shut off Method for Power Circuit84
- Checking Indoor/Outdoor Unit Electrical Parts and Refrigerating Cycle85
- Troubleshooting When Timer Lamp Blinks86
- Self-Diagnosis Lighting Mode87
- Checking Indoor Unit Electrical Parts88
- Power Does Not Come on (no Operation)88
- Outdoor Unit Does Not Operate (but Receives Remote Infrared Signal)89
- Only Indoor Fan Does Not Operate (Other Is Normal)90
- Air Deflector Does Not Move (Others Are Normal)90
- All Systems Stop for Several Sec/Min after Operation Is Started90
- Check the Main P.W.B (Power Circuit)91
- Checking the Remote Controller92
- Checking the Outdoor Unit Electrical Parts93
- Power Circuit Troubles98
- Rotation Speed Does Not Increase98
- Checking the Refrigerating Cycle99
- Checking System Power Module Using Tester100
- How to Operate Using the Service Switch the Outdoor Unit101
- How to Operate the Outdoor Unit Independently101
- System Power Module Diagnosis102
Parts List and Diagram103

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