Trouble Shooting No Error Code; Indoor Unit - No Power - Fujitsu Airstage VR-II Series Service Manual

4-2-10 TROUBLE SHOOTING NO ERROR CODE

Trouble shooting 72

Indoor Unit - No Power

(Except wall mounted type)
Check Point 1 : Power supply
Is not the breaker down?
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 electric line (Neon bulb or electric equipment that may
cause harmonic wave).
Check the complete insulation of grounding.
OK
Check Point 2 : Fuse of Indoor unit
Is not open circuit ?
If the fuse was open state, check the cause of short circuit
on the AC circuit before replacing the spare parts.
NG (Short circuit on AC circuit)
Check Point 3 : Short circuit check on AC circuit
Check on short circuit state step by step
1. Disconnect AC input wire on the terminal board.
2. Disconnect Drain pump AC input connector
3. Disconnect FAN motor AC input connector
NG (Short circuit on AC circuit)
Replace power supply PCB
ReplaceMain PCB
Forecast of Cause :
1. Power Supply failure 2. Outside cause 3. Electrical Component defective
Check Point 4 : Resistor R101
Check Resistor R101,
NG (Open circuit on R101)
Check Point 5 : Short circuit check on DC supply circuit
Disconnect CN102 and check short circuit step by step.
1. Check short circuit between the pin No. 1 and the pin No.6
2. Check short circuit between the pin No. 2 and the pin No.6
NG (Short circuit )
Check Point 6 : Short circuit check on DC13.5V circuit
NG (Short circuit )
Disconnect CN 4 (DC power supply) , and check short circuit
between the pin No. 1 and the pin No.6 step by step
1. Disconnect EEV connector
2. Disconnect SP motor
3. Disconnect Wired Remote Controller
4. Disconnect Transmission PCB
Check Point 7 : Short circuit check on DC5.0V circuit
Disconnect CN 4 (DC power supply) , and check short circuit
between the pin No. 2 and the pin No.6 step by step
NG (Short circuit )
1. Disconnect Indicatopr PCB
2. Disconnect SW PCB
3. Disconnect Transmission PCB
04-81
OK
Open / Short circuit check
OK (Not Open )
3.3 Ohm + 5%
OK (Open circuit )
OK (Open circuit)
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