Troubleshooting - Mitsubishi Electric JT-MC106G-W-NA Handbook

9. Troubleshooting

Work precautions
• When servicing, recreate the malfunction two or three times before starting repairs.
• When servicing, always take care to keep proper footing.
• Before starting the service, always unplug the power cord from the outlet, or turn off the circuit breaker when
no power cord plug is provided. Sufficient care must be taken to avoid electric shock or injury.
• Make sure to connect the power supply wires correctly.
• When removing the circuit board, always hold it at both ends and remove carefully so as not to apply force
to the surface mounted parts.
• When removing the circuit board, be careful of the metal edges on the board.
• When removing or inserting the connectors for the circuit board, hold the entire housing section. Never pull
on the lead wires.
• When circuit board failure is considered to be a cause, check closely for any broken section on the copper
foil patterns, burning or discoloration of parts.
• After replacing a circuit board, make sure to restore the same settings as before the replacement.
Description of the error display
Sensor ON light
(LED 3)
Sensor OFF light
(LED 4)
Heater light
(LED 2)
: ON : OFF
Troubles with error display
Error Display
Sensor Check
(The hand dryer does not
operate, and no lights light
up.)
Check light 2
(LED 6)
Check light 1
(LED 5)
Power light
(LED 1)
: Slow blinking (ON for 0.4 seconds/ OFF for 0.4 seconds)
Cause
Connector discon- Check if the lead wire connectors between the power circuit board
nection and the control circuit board are disconnected.
Blowout of the Measure the resistance across the current fuses (FUSE 1 and 2)
current fuse on the power circuit board. If the resistance is not normal, replace
the power circuit board.
Resistance Judgment
Malfunction of If the error persists after performing the above, replace the control
the control circuit circuit board.
board
Malfunction of If the error persists after replacing the control circuit board, re-
the power circuit place the power circuit board.
board
Model name of the Circuit boards
• Power circuit board: JT-33P
• Control circuit board: JT-33M
• Display circuit board: JT-33D
• Sensor circuit board: JT-33S
Check Method and Remedy
0 Ω Normal
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