Troubleshooting 53: No Operation (Power Is On) - Fujitsu Airstage V series Service Manual

Trouble shooting 53
No Operation (Power is ON)
Check Point 1 : Check indoor and outdoor installation condition
p Indoor Unit - Check incorrect wiring between Indoor Unit - Remote Control, or terminals between Indoor Units.
Or, check if there is an open cable connection.
p Check address setting (Are all the address of Indoor and Outdoor correct?)
p Are these Indoor Unit, Outdoor Unit, and Remote Control suitable model numbers to connect?
>> If there is some abnormal condition, correct it by referring to Installation manual and Data & Technical Manual.
OK
Turn off Power and check/correct followings.
p Isn't Transmission PCB of Indoor Unit removed?
p Is there loose or removed communication line of Indoor Unit and Outdoor Unit?
p Check Terminator (CN22) is installed on Outdoor Controller PCB.
p Check loose or removed communication line between each Outdoor Unit.
p Check loose Transmission PCB of each Outdoor Unit.
OK
Check Point 2 :Check outside cause at Indoor and Outdoor (Voltage drop or Noise)
Instant drop ----- Check if there is a large load electric apparatus in the same circuit.
Momentary power failure ----- Check if there is a defective contact or leak current in the power supply circuit.
Noise ----- Check if there is any equipment causing harmonic wave near elec tric line (Neon bulb or electric equipment that may cause
harmonic wave).
Check the complete insulation of grounding.
OK
Check Point 3 : Check Electrical Components at Indoor and Outdoor
p Check Voltage between CN17 of Controller PCB (Power supply to Remote Control).
>> If it is DC12V, Remote Control is defective (Controller PCB is normal) >> Replace Remote Control
>> If it is DC 0V, Controller PCB is defective (Check Remote Control once again) >> Replace Controller PCB
p If some of Indoor unit does not operate, replace the Transmission PCB of the non-operative Indoor Unit.
>> If the symptom does not change, replace Controller PCB of Indoor Unit.
p If all of Indoor Units do not operate, check the connection between Controller PCB and Transmission PCB of Outdoor Unit (Main Unit).
>> If the symptom does not change, replace Transmission PCB of O utdoor Unit (Main Unit).
(If it did not work, replace Controller PCB.)
Forecast of Cause :
1. Setting/Connection failure 2. Outside cause
3. Electrical Component defective
06-62
DC