Brand: MITSUBISHI ELECTRIC
Category: Other
Document Type: Manual
Language: EN
Manual for JT-MC206GS-W-E
Uploaded: Nov. 21, 2025, 8:27 p.m.
Manual Publish Date: 2012-11-01
Description of circuit operation
(1) Notes for turning the power switch ON / OFF
- When the power switch is turned ON, the power lamp (LED 1) turns on after 1.5 seconds, and the hand dryer becomes ready for operation.
- Before the power lamp turns on, the hand dryer will not operate even if hands are inserted in the hand drying area. In the meantime, the microcomputer (IC1) of the main unit performs the initial settings.
- When the power switch is turned OFF, the power lamp turns off and operation stops.
- The circuitry takes about 30 seconds to discharge the voltage retained in it. Wait until the discharging time elapses before plugging in or out the connectors, replacing the circuit boards, or doing other maintenance.
- Even when any error is occurred, the error display will go off if the power switch has been turned off. Only when a microcomputer error is occurred, the error display persists till the voltage retained in the circuitry has been discharged (till the microcomputer has been reset).
(2) Hand detection and operation
- A range sensor is used as the hand detection sensor.
- When the sensor detects hands, the blower motor turns on and the hand dryer starts to operate.
- Once operation has started, it continues as long as the sensor detects hands.
- If 1 second elapses without detecting hands by the sensor, the blower motor turns off and operation stops.
- The time until the blower motor turns off can be set to 1 or 2 seconds with the switch (SW3-1).
- The hand dryer continuously operates for up to 40 seconds.
- Once 40 seconds have elapsed, the hand dryer stops operating even if hands are detected.
- Since this is a function to assume the presence of a foreign object, the operation will resume if hands are pulled out and reinserted.
(3) Control of the blower motor
- The air speed can be changed by pressing the air speed switch (SW1).
- The hand dryer has two air speed settings.
- The motor does not start in the following occasions: When a temperature detected by the thermostat on the control circuit board (JT-33M) is 65°C or higher, or when a temperature detected by the thermostat on the power circuit board (JT-33P) is 65°C or higher
- The air speed decreases in the following occasion: When a temperature detected by the thermostat on the control circuit board (JT-33M) is 41°C or higher, with the air speed setting HIGH
(4) Control of the heater
- To regulate inrush current at startup, the heater turns on 0.5 seconds later than the blower motor.
- The heater does not turn on in the following occasions: When the heater switch is OFF; When a temperature detected by the thermostat on the control circuit board (JT-33M) is 35°C or higher, or when a temperature detected by the thermostat on the power circuit board (JT-33P) is 55°C or higher
Troubleshooting and error codes
| Error Display | Cause | Check Method and Remedy |
|---|---|---|
| (The hand dryer does not operate, and no lamps light up.) | Connector disconnection | Check if the lead wire connectors between the power circuit board (JT-33P) and the control circuit board (JT-33M) are disconnected. |
| Blowout of the current fuse | Measure the resistance across the current fuses (FUSE 1 and 2) on the power circuit board (JT-33P). If the resistance is not normal, replace the power circuit board (JT-33P). | |
| Malfunction of the power switch | To check the power switch operation ON/OFF, measure the resistance between TAB1 on the power circuit board (JT-33P) and the blue lead connector of the terminal block (indicated by ), and between TAB2 and the brown lead connector (indicated by ). If the resistance is not normal, replace the switch. | |
| Malfunction of the control circuit board (JT-33M) | If the error persists after performing the above, replace the control circuit board (JT-33M). | |
| Malfunction of the power circuit board (JT-33P) | If the error persists after replacing the control circuit board (JT-33M), replace the power circuit board (JT-33P). | |
| (The hand dryer operates, but no lamps light up.) | Tilted or fallen LED | Make sure that the LEDs on the display circuit board (JT-33D) are upright. |
| Malfunction of the display circuit board (JT-33D) | Check if the connector CN8 on the display circuit board (JT-33D) or CN7 on the control circuit board (JT-33M) is disconnected. | |
| Malfunction of the control circuit board (JT-33M) | If the error persists after performing the above, replace the control circuit board (JT-33M). | |
| 40 seconds have elapsed. | If hands are inserted in the hand drying area for 40 seconds, the error occurs. It returns to normal if hands are pulled out. | |
| Remaining foreign object (Tamper-proof timer) | Check for any objects left in the water receiver area, or any dirt sticking to the sensor area. If the hand dryer operates for 40 seconds due to remaining foreign object or dirt on the sensor window, it automatically adjusts the sensor sensitivity after it has stopped, and the error display goes off. After removing the foreign objects or sensor dirt, reset the power (to set the sensor sensitivity again). | |
| (Power failure) | Dirty sensor window | Dirt may shield the sensor. Wipe the dirt off the sensor window. If the error persists after performing the above, replace the control circuit board (JT-33M). |
| Connector disconnection | Check if the lead wire connectors between the power circuit board (JT-33P) and the control circuit board (JT-33M) are disconnected. | |
| Malfunction of the control circuit board (JT-33M) | Replace the control circuit board (JT-33M). | |
| Malfunction of the power circuit board (JT-33P) | Replace the power circuit board (JT-33P) | |
| (Motor error) | Connector disconnection for the motor | Check if the lead wire connectors between the motor and the power circuit board (JT-33P) are disconnected. |
| Motor brush at the end of its life | Replace the blower (assembly). | |
| Motor lock | Check if the motor vanes are locked. | |
| Blown thermal fuse of the motor | Measure the resistance between the both ends of the motor lead. If it is ∞ Ω, replace the blower (assembly). | |
| Malfunction of the control circuit board (JT-33M) | If no error is found after checking the above, replace the control circuit board (JT-33M). | |
| Malfunction of the power circuit board (JT-33P) | If the error persists after replacing the control circuit board (JT-33M), replace the power circuit board (JT-33P). | |
| (Motor brush error) | Unusually worn-out motor brush | Replace the blower (assembly). |
| Motor brush at the end of its life | Replace the blower (assembly). | |
| Malfunction of the control circuit board (JT-33M) | If the error persists after performing the above, replace the control circuit board (JT-33M). | |
| Malfunction of the power circuit board (JT-33P) | If the error persists after replacing the control circuit board (JT-33M), replace the power circuit board (JT-33P). | |
| (Temperature detection error (Power circuit board)) | An abnormal temperature has been detected. | If the temperature on the power circuit board (JT-33P) rises due to the overuse, the hand dryer stops the operation. Leave it until the temperature falls, and then check if the error occurs again. |
| Malfunction of the power circuit board (JT-33P) | If the error persists after performing the above, replace the power circuit board (JT-33P). | |
| (Temperature detection error (Control circuit board)) | An abnormal temperature has been detected. | If the temperature on the control circuit board (JT-33M) rises due to the overuse, the hand dryer stops the operation. Leave it until the temperature falls, and then check if the error occurs again. |
| Malfunction of the control circuit board (JT-33M) | If the error persists after performing the above, replace the control circuit board (JT-33M). | |
| (Control circuit board error) | Malfunction of the control circuit board (JT-33M) | Replace the control circuit board (JT-33M). |