Mitsubishi Electric JT-SB116EH-W-CA, Handbook

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O
When 120V is not supplied, check the following points.
—19—
Confirm that 120V is supplied between TAB1 and TAB2 of
control circuit.
Confirm that the relay connector of power switch lead wire is
not disconnected. (In the power switch box) Disconnected
relay connector
Description of the error mode display
Error Mode Display
Cause Check Method and Remedy
(No display. No Operation.)
Confirmation of
power supply
voltage Confirm that the power switch is turned ON and that 120V is
supplied at both ends of power cord connection on the
terminal block.
Q When 120V is not supplied, check the following points.
1 Check if the earth leakage breaker is turned ON.
2 Check if the power cord is connected securely to the
terminal block.
Confirmation of
power supply voltage
on the control circuit
Measure the resistance between Blue-Orange wires and Brown-
Orange wires on the relay connector of power switch lead wire. Defective power
switch
Switch (Power)
Relay connector
Orange
Blue
Blue
Brown
Tester
Brown
Orange
Orange
Orange
side
side
Power
O
Heater
O
Check
O
Blue LED
O
O
: ON : Slow flicker (ON for 0.4 second / OFF for 0.4 second)
O : OFF : Quick flicker (ON for 0.1 second/OFF for 0.1 second)
Error display
Power Heater check Blue LED
Switch (Power) “ON” : 0
Ω
Switch (Power) “OFF” :
∞
Ω
10. Troubleshooting
Q
Cautions for service work
• Before starting the service, try to reproduce the error phenomenon 2 to 3 times.
• Secure a stable foothold during the service.
• Before starting the service, always unplug the power cord from the outlet, or turn off the earth leakage breaker
where no power cord plug is provided. Sufficient care must be taken to avoid electric shock or injury.
• Make sure to connect power supply wires correctly.
• When removing a circuit board, hold a side of board to avoid exerting any undue stress to parts on the board.
• When removing a circuit board, take care not to hurt fingers with sharp edges of metal sheet.
• When disconnecting connectors, don’t hold the lead wire to pull but hold instead the whole housing section.
• When a circuit board is suspected defective, closely check for any broken section on the copper foil patterns,
or burn or discoloration of parts.
• After replacing a circuit board, make sure to restore the same setting as before the replacement.
Part names used in the following text correspond to those listed in the parts catalog.