Trouble shooting 75
RB Unit - No Power
Forecast of Cause :
1. Power Supply failure 2. Outside cause 3. Electrical Component defective
Is not the breaker down?
Check Point 1 : Power supply
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
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.
Check Point 2 : Fuse on the PCB
NG (Short circuit on AC circuit)
Disconnect AC Power input wires (W101,W102) and Check
short circuit
Check Point 3 : Short circuit check on AC circuit
NG (Short circuit on AC circuit)
Replace Main PCB
Check Short circuit between Pin No.1 and Pin No.2 of SV coil
Check Point 4 : Short circuit on SV coil
Disconnect transmission PCB and check DC 5.0V on C1
Check Point 5-2 : Short circuit check on DC circuit
NG (Short circuit between Earth)
OK
OK
Replace Transmission PCB
Check the DC (5.0V) on C1
Check Point 5-1 : Short circuit check on DC circuit
NG (No voltage)
OK (DC 5.0V )
Replace SV Coil with Connector
NG (No Voltage DC 5.0V )
Replace Main PCB
04-84
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