September 2009
No. U159
HAND DRYER
HAND BOOK
FOR DEALERS
Model:
JT-SB116EH-G-UL
Nameplate
Repair work should be performed by
the manufacturer, its service agent or
similarly qualified person in order to
avoid hazards.
Contents
1. Safety precautions ······························································· 3–4
2. Names and functions of components·········································· 4
3. Specifications·············································································· 5
4. Outside dimensions ··································································· 5
5. Electrical wiring diagram····························································· 6
6. Basic circuit diagrams ························································· 7–13
7. Fundamentals of operation ················································· 14–15
8. Troubleshooting ·································································· 16–21
9. How to call ················································································ 22
10. Service inspection list ······························································· 22
11. Overhaul procedure···························································· 23–33
12. Parts catalog······································································· 34–46
1. Safety precautions
GPlease read the following items carefully before using this product, and perform the maintenance and repair work
of the product correctly and safely.
GThe types and levels of the dangers from mishandling this product are categorized and indicated by the signs
shown below.
Items that may cause death or serious injury if the product is mishandled.
Warning
Caution for electric shock
Turn off the power
If it is absolutely necessary to inspect the circuitry
while turning on electricity, exercise caution not to
touch live parts.
(Touching live parts may cause electric
shock.)
Be sure to turn off the ground fault interrupter and the
breaker at the service panel prior to starting repair
work. (The charge voltage in the circuitry remains for
another minute or so, even after the power is turned
off and the LED is unlit; therefore, wait for at least 1
minute before disassembling the product.)
Caution for
electric shock
Modification prohibited
(Not turning off the power may cause electric
shock.)
Never modify the product.
(Modifying may cause electric shock, fire,
and/or injury.)
Use proper parts and tools
Use the parts listed in the service parts list of the subject model with appropriate tools when
repairing.
Prohibited
Conduct electric work correctly
• Use the designated electric wires, and conduct
electric work according to the Electrical Equipment
Technical Standard, Internal Wiring Regulation, and
Installation Work Guide.
• Be sure to check whether the terminals
and fixed wiring are securely connected.
(Improper connection or installation may
cause electric shock or fire.)
Implement by always
following instructions
Implement by always
following instructions
(Using improper parts and tools may cause
electric shock, fire, and/or injury.)
Check insulation
Upon completing repair work, always measure the
insulation resistance. Verify that it is at least 10 MΩ
(with a 500V DC insulation resistance
tester), and then turn on the power.
(Inadequate insulation may cause electric
shock.)
Scratches and deterioration
Implement by always
following instructions
Implement by always
following instructions
Be sure to replace scratched and/or
deteriorated wiring and lead wires.
(They may cause electric shock and/or fire.)
Implement by always
following instructions
Items that may cause injury and/or damage to buildings
and/or fixtures if the product is mishandled.
Caution
Caution for high temperatures
Wear gloves
Wait until the regenerative heater of heater unit cools
down sufficiently before starting
inspection or repair.
Always wear a pair of gloves during inspection or
repair work.
(Not wearing gloves may cause injury.)
(It may cause burn.)
Implement by always
following instructions
—3—
Implement by always
following instructions
Items to check during repair work
• Inspect the condition of the ground. Correct it if improperly grounded. Also, check to see if a ground fault
interrupter or an overload protection device is being installed. If not, recommend the dealer to install one.
• Check to see whether or not the air filter and the drain tank are installed securely in place.
• Do not leave a towel or other object in the hand-drying area.
• Never place any object on the main body nor cover it.
• Make sure that the product is not being used in any of the following locations:
• At elevations above 6,560 ft. (2,000 m).
• Where the ambient temperature will fall outside the range of 50 °F (10 °C) to 104 °F (40 °C), or 50 °F
(10 °C) to 86 °F (30 °C) if the elevation is over 3,280 ft. (1,000 m).
• Where the relative humidity will exceed 5-95%, or where condensation will form due to rapid
temperature changes.
• Where dust, salt, or metal particle densities are high.
• Where corrosive, neutral or reductive gases are present.
• Outside or in an area exposed to direct sunlight (or other strong light) or in direct moisture.
• Near a bath, shower or a swimming pool.
• An area subjected to vibration or pounding, e.g., on trains/vessels.
• Next to food, tableware or cooking appliances.
• In narrow hallways and behind swinging doors.
• Where vandalism is likely to occur.
OUpon completing repair work, verify that the product operates properly. Clean the product's main body and
surrounding area, and notify the customer of the completion of the repair work.
2. Names and functions of components
1
Open
the cover.
2
Heater light
Turn the switch on.
Hand sensor switch*
Inspection light
Hand drying area
* Before cleaning the unit, turn the switch off.
The blower does not turn on while cleaning.
3
Power light
Ensure the drain
tank and filter
Air filter
are in place.
Drain tank
Heater
—4—
3. Specifications
Model
JT-SB116EH-G-UL
Rated
Voltage
(V)
120
Rated
Rated Current
Frequency
(A)
(Hz)
60
9.8
Weight
Drain Tank
(pt)
37lbs
(17kg)
1.7
4. Outside dimensions
Back Electrical Inlet
Electrical Conduit/Tubing
8 3/4”
1/16”
(222 mm) (1 mm)
2” (50mm)
9 7/ 16”
(240 mm)
10 1/4”(260 mm)
30 5/8” (777 mm)
9 7 /16”
(240 mm)
33” (838 mm)
9 1/16”
(230 mm)
min. 11 3/4”
(300 mm)
11 3/4”(300 mm)
13 1/8”
(334 mm)
23 5/8” (600 mm) - 26 3/8” (670 mm)
13” (331 mm)
1 3/8”
(35mm)
min. 9 7/8”
(250 mm)
1/2” (16mm)
Connector
6”(152 mm)
In. (mm)
—5—
121˚C(OPEN)
94˚C(OPEN)
Thermal
Fuse 3
Thermal
Fuse 4
HEATER
CN7
Low-voltage circuit
Line-voltage circuit
AIR SPEED CN5
OFF
ON
CN11 LOW HIGH
CN10
CN6
Power
LED
Heater
LED
Check
LED
Blue
LED
Motor overspeed, step-out.
Motor lock.
Overcurrent.
Overvoltage, undervoltage.
Heat sink overheating.
Current detection error.
Upper sensor error.
Lower sensor error.
Microcomputer signal error.
Microcomputer error.
Fuse fusion.
Tamper-proof timer.
Room thermistor error.
Heater error.
Malfunction
CN12
JT-24S-C
Location
CN13
CN16
CN15
White
CN12
Reactor
Thermistor
White
White
BLOWER
Thermal Fuse 3
Brown TAB4 White TAB5
Brown
TAB2 TAB1
TAB3
Black White
White
White
120Vac 60Hz
L N (WHITE)
Blinking (every 0.4 sec)
Blinking (every 0.1 sec)
White
Red
White
Black
Lit
Unlit
TAB6
TAB7
TAB8
JT-29P
CN2
JT-24S-E
TERMINAL BLOCK
CN18
TAB9
CN1
CN14
Hand Sensor Switch
JT-24S-B
CN11
JT-24S-A
Air filter, Blower, JT-29P or JT-29M.
Blower, JT-29P or JT-29M.
Blower, JT-29P or JT-29M.
Power supply, JT-29P or JT-29M.
Air filter, JT-29P or JT-29M.
Blower, JT-29P or JT-29M.
Sensor window (dirt), JT-24S or JT-29M.
Sensor window (dirt), JT-24S or JT-29M.
JT-29P or JT-29M.
JT-29P or JT-29M.
Fuse 1, 2 , 3, Thermal fuse 3, 4 or JT-29P.
Continuous operation or Sensor window (dirt).
JT-24S-A (room thermistor).
Heater, Heater thermistor, Thermal fuse 1 or 2.
Troubleshooting Quick Reference Chart
Thermostat 200˚C(OPEN)
150˚C(CLOSE)
172˚C(OPEN)
172˚C(OPEN)
250V 20A
250V 20A
250V 5A
Thermal
Fuse 2
Fuse 1
Fuse 2
Fuse 3
Thermal
Fuse 1
CN9
Black
JT-29M
White
Black
Fuse 3
MOTOR LOAD 120Vac 6.8A
Fuse 1
120Vac 60Hz 9.8A
Red
Thermal
Fuse 1
JT-SB116EH-G-UL
Fuse 2
Green
Yellow
Thermal
Fuse 4
Blue
—6—
Blue
HEATER
Thermal
Fuse 2
Thermostat
MODEL
5. Electrical wiring diagram
6. Basic circuit diagrams
6-1 Circuit diagram and check points
(1) Main circuit (JT-29)
Bus voltage (Being stopped):170V DC (JT-29P: TAB5)
Heater power supply (With heater ON): 120V AC (JT-29P: Between TAB3-TAB4)
Power supply voltage:120V AC (JT-29P: Between TAB1-TAB2)
15V (JT-29M: CN7 1P)
Insulated power supply
0V (JT-29M: CN7 5P)
Insulated power supply
5V (JT-29P: CN3 1P)
Non-insulated power supply
5V (JT-29M: CN6 1P)
Insulated power supply
0V (JT-29P: CN3 3P)
Non-insulated power supply
Reset input 5V (JT-29P: IC1 11P)
Carrier frequency 13.9kHz (JT-29P: IC1 3P)
Clock frequency 8MHz (JT-29M: IC2 14P)
Reset input 5V (JT-29M: IC2 11P)
Clock frequency 8MHz (JT-29P: IC1 14P)
—7—
—8—
(2) Sub circuit (JT-24S)
お掃除SW
—9—
Room thermostat characteristics (JT-29M: CN6 7P)
Resistance
Temperature
CN6 7P Voltage
10°C
20°C
30°C
9.01kΩ
6.13kΩ
4.27kΩ
2.37V
1.90V
1.50V
Upper sensor's light receiving signal waveform (JT-29M: CN7 3P)
(JT-24S-B: CN14 3P)
(Rises when hands are inserted)
100msec
(Influence of light emission by the lower sensor)
Heater thermostat characteristics (JT-29M: CN9 2P)
Temperature
Resistance
CN9 2P Voltage
150°C
200°C
250°C
29.84kΩ
8.00kΩ
2.72kΩ
3.74V
2.22V
1.07V
Lower sensor's light receiving signal waveform (JT-29M: CN7 2P)
(JT-24S-B: CN14 2P)
(Does not appear when hands are inserted)
100msec
FIN overheat detector characteristics (JT-29P: IC1 8P)
Temperature
PTC Resistance
Input Voltage
25°C
70°C
80°C
330Ω or less
1.5kΩ or less
2.2kΩ or more
0.16V or less
0.65V or less
0.90V or more
Lower sensor's light emitting signal waveform (JT-29M: CN5 3P)
(JT-24S-C: CN15 3P)
100msec
— 10 —
6-2 Circuit board diagrams and check points
(1) Power circuit board (JT-29P)
Bus voltage (Being stopped):170V DC
(JT-29P: TAB5)
Heater power supply (With heater ON): 120V AC
(JT-29P: Between TAB3-TAB4)
Clock frequency 8MHz
(JT-29P: IC1 14P)
0V (JT-29P: CN3 3P) Non-insulated power supply
Power supply voltage:120V AC
(JT-29P: Between TAB1-TAB2)
5V (JT-29P: CN3 1P)
Non-insulated power supply
Carrier frequency 13.9kHz (JT-29P: IC1 3P)
Reset input 5V
(JT-29P: IC1 11P)
If 200V AC is applied to the product, ZNR1 and FUSE3 will be destroyed.
(2) Microcomputer circuit board (JT-29M)
Clock frequency 8MHz
(JT-29M: IC2 14P)
15V (JT-29M: CN10 1P)
Insulated power supply
Reset input 5V
(JT-29M: IC2 11P)
5V (JT-29M: CN11 1P)
Insulated power supply
0V (JT-29M: CN11 5P)
Insulated power supply
— 11 —
(3) Indicator circuit board (JT-24S-A)
(4) Light receiving circuit board (JT-24S-B)
(5) Light emitting circuit board (JT-24S-C)
(6)Illumination circuit board (JT-24S-E) (Blue LED)
— 12 —
Room thermostat characteristics (JT-29M: CN6 7P)
Resistance
Temperature
CN6 7P Voltage
10°C
20°C
30°C
9.01kΩ
6.13kΩ
4.27kΩ
2.37V
1.90V
1.50V
Upper sensor's light receiving signal waveform (JT-29M: CN7 3P)
(JT-24S-B: CN14 3P)
(Rises when hands are inserted)
100msec
(Influence of light emission by the lower sensor)
Heater thermostat characteristics (JT-29M: CN9 2P)
Temperature
Resistance
CN9 2P Voltage
150°C
200°C
250°C
29.84kΩ
8.00kΩ
2.72kΩ
3.74V
2.22V
1.07V
Lower sensor's light receiving signal waveform (JT-29M: CN7 2P)
(JT-24S-B: CN14 2P)
(Does not appear when hands are inserted)
100msec
FIN overheat detector characteristics (JT-29P: IC1 8P)
Temperature
PTC Resistance
Input Voltage
25°C
70°C
80°C
330Ω or less
1.5kΩ or less
2.2kΩ or more
0.16V or less
0.65V or less
0.90V or more
Lower sensor's light emitting signal waveform (JT-29M: CN5 3P)
(JT-24S-C: CN15 3P)
100msec
— 13 —
7. Fundamentals of operation
O Description of circuit operation
(1) Notes for turning the power switch “ON / OFF”
1 When the breaker at the service panel is turned “ON” and power is supplied to the product, the power
light (LED1), blue emblem light (LED4) and illumination lights (LED10, 11) turn on after 1.5 seconds, and
the hand dryer becomes ready for operation.
• Before the power light turns on, the hand dryer will not operate even if hands are inserted in the hand
drying area. In the meantime, the microcomputer of the main unit (IC2) performs the initial settings,
including the setting of the hand detection sensor sensitivity, etc.
• In order to set the sensitivity of the hand detection sensor correctly, don’t insert hands in the hand
drying area until the power light is turned on. (If the sensitivity is set abnormally, by neglecting this note,
an error is displayed and the operation stops. In such an occasion, cancel the setting by turning off the
hand sensor switch or the breaker.)
2 When the breaker at the service panel is turned “OFF”, the power light, blue emblem light and
illumination lights turn off and operation stops.
• The circuitry takes about 1 minute to discharge the voltage retained in it. Wait until this discharging time
elapses before plugging in or out the connectors, replacing the circuit boards, or doing other
maintenance.
(2) Hand detection and operation
1 The hand detection sensor is an infrared sensor containing the light emitting sensor (infrared LED), light
receiving sensor (photo-diode), etc. and consists of both the upper (front) sensor and the lower (back)
sensor.
2 Reflection type upper sensor … This sensor detects the change in the reflected amount of infrared light
when hands are inserted. Transmission type lower sensor … This sensor detects that the infrared light is
shielded when hands are inserted.
3 When the lower sensor detects hands, the blower motor turns on and the hand dryer starts to operate.
4 Once operation has started, it continues as long as either the upper or lower sensor detects hands.
5 If 1.5 seconds elapse without the upper and lower sensors detecting hands, the blower motor turns off
and operation stops.
6 The hand dryer continuously operates for up to 30 seconds.
• Once 30 seconds have elapsed, the hand dryer stops operating even if hands are detected.
• Since this is a function to override the presence of a foreign object, the operation will resume if hands
are pulled out and reinserted.
(3) Control of the blower motor
1 A DC brushless motor is used for the blower. This motor has no hole sensor to detect the rotor position,
but instead measures the counter electromotive voltage produced by the motor coil to judge the rotor
position and the revolving direction so as to drive the motor.
2 Outputs from the motor control microcomputer (IC1) are transmitted via the drive IC (IC3) to control the
power step MOSFET (driving transistor) that drives the motor.
— 14 —
(4) Control of the heater temperature
1 Room thermistor detects the room temperature while the heater thermistor monitors the heater
temperature.
2 The room thermistor temperature determines the heater control temperature. (When the room
temperature becomes colder, the heater control temperature will become higher, and the hot air
temperature is maintained at about 35°C.)
3 Heater turns ON/OFF depending on the heater control temperature, but it does not turn ON in the
following occasions.
• When the heater switch is turned “OFF” (Heater light is unlit.)
• When the room thermistor detection temperature is 35°C or higher
(5) Cancellation of the Error display
• In the case of an error, eliminate the cause of the error. Then, reset the error display by turning off the
hand sensor switch or the breaker.
— 15 —
8. Troubleshooting
Q Work precautions
• When servicing, be sure to 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 ground fault interrupter
and the breaker at the service panel 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 a circuit board, take care not to injure any body parts with the sharp edges of the metal sheet.
• 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 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.
@ The part names used in the following text correspond to those listed in the parts catalog.
Description of the error mode display
〇
〇
Power
Heater
O: ON
O: OFF
〇
〇
Check Blue LED
,: Slow blinking (ON for 0.4 seconds / OFF for 0.4 seconds)
@: Fast blinking (ON for 0.1 second / OFF for 0.1 second)
Troubles with error display
Error Mode Display
Cause
Power Heater Inspection Blue LED Confirmation of
power supply
O
O
O
O
voltage
(No display. No Operation.)
Confirmation of
power supply
voltage on control
circuit
Check Method and Remedy
Confirm that the breaker is turned ON and that 120 V AC is
supplied at both ends of the power cord connection on the
terminal block.
Confirm that 120 V AC is supplied between TAB1 (white) and
TAB2 (black) on the power circuit board (JT-29P).
OWhen 120 V AC is not supplied to the control circuit, check the following
points.
With the breaker being turned ON, measure the resistance
Blown terminal
between the terminal at the thermal fuse connection side of
block thermal
the terminal block and the lead wire from TAB2 (black) on the
fuse
power circuit board (JT-29P). Check if the resistance is ∞ Ω
or not. If it is ∞ Ω, the thermal fuse is blown.
Remove the lead wire from TAB2 (black) on the power circuit
board (JT-29P) before measurement.
— 16 —
Cause
Error Mode Display
Check Method and Remedy
Power Heater Inspection Blue LED OWhen 120 V AC is supplied to the control circuit, check the following
points.
O
O
O
O
Blown current
Check if the current fuses (FUSE1, 2, 3) on the power circuit
(No display. No Operation.)
fuse
board (JT-29P) are blown or not.
If any voltage higher than 120 V AC is applied by an error
during the power supply work or if lightning strikes, FUSE3
(5A) may be blown and ZNR1 may be destroyed.
Disconnected
Check if CN6 on the microcomputer circuit board (JT-29M) or
lead wire
CN11 on the indicator circuit board (JT-24S-A) is disconnected.
Control circuit
malfunction
Power Heater Inspection Blue LED Leftover object
O or O
O
O
(Tamper prevention timer)
Dirty sensor
window
If no error is found after checking the above, replace the
power circuit board (JT-29P).
(If the trouble persists even after the replacement, replace the
microcomputer circuit board (JT-29M).)
Check for any objects left over and shielding the sensor in the
drying area.
Dirty window may shield sensor light. Clean the sensor
window.
Power Heater Inspection Blue LED Blower (assembly) Replace the blower (assembly).
malfunction
O
O
O
O
Control circuit
If no error is found after checking the above, replace the
(Motor over-revolution, out-of-order errors) malfunction
power circuit board (JT-29P).
(If the trouble persists even after the replacement, replace the
microcomputer circuit board (JT-29M).)
Power Heater Inspection Blue LED Blower (assembly) Check if the blower motor is locked or turns smoothly by
malfunction
hand.
O
O
O
Control circuit
If no error is found after checking the above, replace the
(Motor start error, motor lock) malfunction
power circuit board (JT-29P).
(If the trouble persists even after the replacement, replace the
microcomputer circuit board (JT-29M).)
Check for causes of the motor overload. (Too much higher
Power Heater Inspection Blue LED Blower motor
power supply voltage, any objects disturbing the motor
overload
O
O
O
O
revolution, etc.)
(Over-current error)
Control circuit
If no error is found after checking the above, replace the
malfunction
Power Heater Inspection Blue LED
O
O
O
(Detection of over-voltage,
under-voltage)
Application of
over-voltage
power circuit board (JT-29P).
(If the trouble persists even after the replacement, replace the
microcomputer circuit board (JT-29M).)
Check if correct power supply voltage is applied.
• Error will occur if the power supply voltage is at about 155 V AC or over.
Application of
under-voltage
Check if correct power supply voltage is applied.
• Error will occur if the power supply voltage is at about 70 V AC or under.
Control circuit
malfunction
If no error is found after checking the above, replace the
power circuit board (JT-29P).
(If the trouble persists even after the replacement, replace the
microcomputer circuit board (JT-29M).)
— 17 —
Error Mode Display
Cause
Check Method and Remedy
Power Heater Inspection Blue LED Accumulated dust If the filter is clogged with dust, clean the filter.
If the control circuit or electronic parts have high temperature,
O
O
turn OFF the breaker and cool down the parts up to the
(FIN overheat error)
normal temperature (40°C or under).
Control circuit
If no error is found after checking the above, replace the
malfunction
power circuit board (JT-29P).
(If the trouble persists even after the replacement, replace the
microcomputer circuit board (JT-29M)).
Disconnected
Check
if the motor lead wires (red: TAB7, white: TAB8, black:
Power Heater Inspection Blue LED
motor lead wire
TAB9) on the power circuit board (JT-29P) are disconnected.
O
O
O
Blown motor
Measure the resistance between the motor lead wires “Red(Current detection circuit error) thermal fuse
White” and “Red-Black”. If it is ∞ Ω, replace the blower (assembly).
Control circuit
malfunction
If no error is found after checking the above, replace the
power circuit board (JT-29P).
(If the trouble persists even after the replacement, replace the
microcomputer circuit board (JT-29M).)
Power Heater Inspection Blue LED Sensor is shielded Turn OFF the hand sensor switch, in the state that the
within 1 second
indicator LEDs are off, and then turn ON the hand sensor
O
O
after turning hand switch again.
(Light receiving circuit board
sensor switch ON While turning and within 1 second after turning on the hand
error)
sensor switch, do not insert hands or other objects (for the
Occurring at the power ON
sensor sensitivity settings).
Dirty sensor
window
Dirty window may shield sensor light. Clean the sensor
window.
Disconnected
lead wire of light
receiving circuit
board
Disconnected
light receiving
circuit board
(panel (back) side)
Light receiving
circuit board
malfunction
(panel (back) side)
Check if the lead wire of the light receiving circuit board (CN7
or CN14) is disconnected. (CN14 is on the light receiving
circuit board (JT-24S-B).)
Control circuit
malfunction
Check the light receiving circuit board (JT-24S-B) for
disconnection or displaced mounting position.
Visually check for cracks on the circuit board, corroded
electronic parts, defective soldering, etc.
(If the trouble persists even after the replacement of the
control circuit shown as below, replace the light receiving
circuit board (JT-24S-B).)
If no error is found after checking the above, replace the
power circuit board (JT-29P).
(If the trouble persists even after the replacement, replace the
microcomputer circuit board (JT-29M).)
— 18 —
Error Mode Display
Cause
Power Heater Inspection Blue LED Sensor is shielded
within 1 second
O
O
after turning hand
(Light emitting circuit board
sensor switch ON
error)
Occurring at the power ON
Turn OFF the hand sensor switch, in the state that the
indicator LEDs are off, and then turn ON the hand sensor
switch again.
While turning and within 1 second after turning on the hand
sensor switch, do not insert hands or other objects (for the
sensor sensitivity settings).
Dirty sensor
window
Dirty window may shield sensor light. Clean the sensor
window.
Disconnected
lead wire of light
emitting circuit
board
Disconnected
light emitting
circuit board
(panel (front) side)
Light emitting
circuit board
malfunction
(panel (front) side)
Check if the lead wire of the light emitting circuit board (CN5
or CN15) is disconnected. (CN15 is on the light emitting
circuit board (JT-24S-C).)
Microcomputer
circuit board
malfunction
Power Heater Inspection Blue LED Control circuit
malfunction
O
O
O
(Microcomputer signal error)
Power Heater Inspection Blue LED Control circuit
malfunction
O
O
O
(Microcomputer error)
Check Method and Remedy
Check the light emitting circuit board (JT-24S-C) for
disconnection or displaced mounting position.
Visually check for cracks on the circuit board, corroded
electronic parts, defective soldering, etc.
(If the trouble persists even after the replacement of the
control circuit shown as below, replace the light emitting
circuit board (JT-24S-C).)
If no error is found after checking the above, replace the
microcomputer circuit board (JT-29M).
If no error is found after checking the above, replace the
power circuit board (JT-29P).
(If the trouble persists even after the replacement, replace the
microcomputer circuit board (JT-29M).)
If no error is found after checking the above, replace the
power circuit board (JT-29P).
(If the trouble persists even after the replacement, replace the
microcomputer circuit board (JT-29M).)
— 19 —
Troubles related to the heater
Error Mode Display
Cause
Power Heater Inspection Blue LED Room thermistor
malfunction
O
O
O
O
(Room thermistor error)
Microcomputer
circuit board
malfunction
Power Heater Inspection Blue LED Disconnected
heater thermistor
O
O
O
lead wire
(Heater error)
Heater thermistor
malfunction
Check Method and Remedy
Check if the lead wire of the room thermistor on the indictor
circuit board (CN12) is disconnected. If it is not disconnected,
replace the indicator circuit board (JT-24S-A).
If no error is found after checking the above, replace the
microcomputer circuit board (JT-29M).
Check if the lead wire of the heater thermistor (CN9) is
disconnected. (CN9 is on the microcomputer circuit board
(JT-29M).)
Disconnect the lead wire of the heater thermistor (CN9) from
the microcomputer circuit board (JT-29M), and then measure
the resistance between pins 2 and 3 at the lead wire side.
Normal Value
Approx. 150kΩ or over
Check the value shown at left while the
heater is cold (not higher than 100°C).
Note) If the circuit is open due to broken wires, etc., the
resistance becomes
Ω.
∞
Warm air does not blow
Control circuit
malfunction
If no error is found after checking the above, replace the
power circuit board (JT-29P).
(If the trouble persists even after the replacement, replace the
microcomputer circuit board (JT-29M).)
Heater switch
Check if the heater switch is turned ON.
Disconnected
heater power
supply wire
Check if the heater power supply wire (TAB3 or 4) is
disconnected.
Control circuit
malfunction
Check if 120 V AC is output at both ends of the heater power
supply wire (TAB3 and 4). If not, replace the power circuit
board (JT-29P).
(If the trouble persists even after the replacement, replace the
microcomputer circuit board (JT-29M).)
Heater
malfunction
If no error is found after checking the above, replace the
heater.
— 20 —
Troubles without error display
Cause
Check Method and Remedy
Operation continues after
pulling hands out
Inappropriate
sensor sensitivity
(due to inserting
hands etc. within
1 second after
turning hand
sensor switch
ON)
Air volume does not change
Microcomputer
circuit board
malfunction
1 Turn OFF the hand sensor switch, in the state that the
indicator LEDs are off, turn ON the hand sensor switch
again. While turning and within 1 second after turning on
the hand sensor switch, do not insert hands or other
objects (for the sensor sensitivity settings).
2 If the trouble persists even after performing the 1 action
(resetting the hand sensor switch), take actions for the light
receiving/emitting circuit board errors according to the
instruction of troubleshooting (pages 18 and 19).
If no error is found after checking the air volume, replace the
microcomputer circuit board (JT-29M).
Abnormal noise
Sucking of foreign Check for any foreign matter sticking to the blower
(assembly) vanes.
matter
Phenomenon
Clogged filter
Check the filter for clogging with dust, etc.
Incorrect wiring
Check the motor lead wires of the blower (assembly) (red:
TAB7, white: TAB8, black: TAB9) for incorrect connection to
the power circuit board (JT-29P).
(If they are connected incorrectly, the motor turns in the
reverse direction.)
— 21 —
9. How to call
Phenomenon
Cause, Inspection and Remedy
Air speed is too low to dry quickly.
1Check if the filter is clogged.
2Isn’t the air speed switch set at the Low position?
Water leaks from the product.
1Check if the drain tank is filled up. (Empty the drain tank.)
Since the main unit may get flooded with water if the product
operates with the drain tank is full, drain water will flow over
when it is filled up beyond its capacity.
2Is the drain tank installed properly?
・Operation continues after pulling
hands out.
・Operation stops when starting to dry
hands
1 The sensor may be shielded due to inserting hands or remaining
objects while turning and within 1 second after turning the hand
sensor switch ON.
2 Turn OFF the hand sensor switch, in the state that the indicator
LEDs are off, and then turn ON the hand sensor switch again.
While turning and within 1 second after turning on the hand
sensor switch, do not insert hands or other objects (for the
sensor sensitivity settings).
It takes 1 second after turning on the hand sensor switch to charge
the power circuit board (JT-29P). Operation stops in the meantime.
Air does not blow immediately after
turning on the hand sensor switch and
inserting hands.
No warm air is blown.
Is the heater switch turned ON?
Odor from the product
1Check if the drain tank is filled up. (Empty the drain tank.)
2Check the inside of drain tank for any foreign matter. (Remove
it.)
3When operating the product initially, burning smell may arise as
oil or dust adhered to the heater burns. This is normal.
10. Service inspection list
Location
Electric wiring
Operation
Heater
Indicator LED
Wall installation
Inspection Item
Are lead wire connectors connected securely?
Are all wires connected correctly?
Does it operate properly?
Isn’t there any abnormal noise, vibration, etc?
Is warm air blown?
Does every LED and illumination light turn on?
Isn’t the product separated too far away from the wall?
— 22 —
Check Result
11. Overhaul procedure
Q Work precautions
• Before replacing parts, follow the instructions described in the troubleshooting.
• 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 ground fault interrupter
and the breaker at the service panel 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.
• After completing repairs, check that the unit operates properly.
The part names used in the following text correspond to those listed in the parts catalog.
(1) Turn off the power supply.
(2) Microcomputer circuit board (JT-29M)
1 Draw out the drain tank, and remove the front panel clamping
screws.
(Two special screws 4 x 16, indicated by O)
2 Remove the duct cover clamping screw.
(One special screw 4 x 16, indicated by O)
3 Disconnect the lead wires.
4 Remove the microcomputer circuit board clamping screws.
(Three special PPT screws 4 x 8, indicated by O)
Assembly precaution
Take care not to pinch the lead wires.
(3) Power circuit board (JT-29P)
1 Disconnect the lead wires for the microcomputer circuit board.
See (2) 1 to 3.
2 Remove the terminal cover clamping screw, and remove the
terminal cover.
(One PTT screw 4 x 8, indicated by O)
— 23 —
3 Remove the ferrite cores.
(Release the two claws for each, indicated by O)
Assembly precaution
Pass the black and white lead wires, and the board ground
wire through the ferrite core.
4 Remove the terminal block fix holder clamping screw.
(One PTT screw 4 x 8, indicated by O)
Assembly precautions
• Hook the claw of the terminal block fix holder on the square
hole of the box (reactor) (indicated by
• Take care not to pinch the lead wires.
).
5 Remove the ground wire clamping screw.
(One PTT screw 4 x 8, indicated by O)
6 Remove the clamping screws for the power circuit board and
cord clips.
(Four PTT screws 4 x 16, indicated by O)
7 Remove the cord bands (indicated by
).
— 24 —
8 Draw out the power circuit board.
9 Remove the board cover (indicated by O).
0 Disconnect the lead wires from the power circuit board, and
remove the cord bushes (indicated by O).
Assembly precautions
• Remove the power circuit board after removal of the terminal
cover.
• Connect the lead wires as shown in the board cover.
(4) Thermal fuse (terminal block)
1 Remove the power circuit board. See (3) 1 to 0.
2 Remove the lead wire clamping screws (indicated by O).
3 Remove the terminal block clamping screws.
(Two PPT screws 4 x 20, indicated by
)
Assembly precaution
Set the marking of the thermal fuse at the center of the
terminal block (indicated by O) .
— 25 —
(5) Blower
1 Remove the power circuit board. See (3) 1 to 0.
2 Remove the drain pipe clamping screw.
(One PTT screw 4 x 16, indicated by O)
3 Remove the ground wire clamping screw.
(One PTT screw 4 x 8, indicated by O)
4 Remove the blower cover clamping screws.
(Four PTT screws 4 x 16, indicated by O)
5 Remove the cord bush (indicated by
).
Assembly precaution
Insert the cord bush securely in the neck.
6 Remove the blower (assembly).
Assembly precautions
• Set the blower lead wire at the left side and the ground wire
at the right side. (See photograph.)
• Replace the packing used in the disassembled section with
a new one (indicated by O).
• Take care not to twist the packing when installing it.
(6) Heater unit
1 Remove the power circuit board. See (3) 1 to 0.
2 Remove the casing clamping screws.
(Two special screws 4 x 16, indicated by O)
— 26 —
3 Slide and remove the casing.
4 Remove the ground wire clamping screw.
(One special PPT screw with spring washer 4 x 8, indicated by O)
5 Remove the back cover clamping screws.
(Five special screws 4 x 12, indicated by
)
Assembly precautions
• When securing the lead wires with cord clips, make sure the
wires are not loose in the casing.
• Take care not to omit the spring washer when clamping the
ground wire.
6 Remove the heater box (indicated by O).
7 Remove the heater plate clamping screw.
(One special screw 4 x 8, indicated by O)
Assembly precaution
Hook the claw of the heater plate on the heater box
(indicated by O).
— 27 —
8 Remove the heater box clamping screw.
(One special screw 4 x 8, indicated by O)
Assembly precaution
Hook the claw of the heater box on the heater base (indicated
by O).
9 Remove the heater base clamping screws.
(Three special screws 4 x 8, indicated by O)
0 Remove the thermistor clamping screw.
(One special PPT screw 4 x 8, indicated by O)
Assembly precautions
• Wipe off any old oil compound adhered to the end of
thermistor lead wires and the heater.
• Apply new oil compound at the mounting hole for thermistor
lead wires.
• Pack oil compound in the space between the heater and the
thermistor.
A Remove the thermistor clamping screws.
(Two SW-PW · PP screws 3 x 8, indicated by O)
B Remove the fuse fix plate clamping screw.
(One SW-PW · PP screw 4 x 8, indicated by
)
— 28 —
Assembly precaution
Take care not to omit the fix plate under the thermistor
(indicated by O).
C Remove the thermal fuse fixing screws.
(Two SW-PW · PP screws 4 x 8, indicated by O)
Assembly precaution
Set the cord clip at the marked position on the thermal fuse
lead wire, and then clamp it with the screws.
(7) Light emitting circuit board (JT-24S-C)
1 Disconnect the lead wires for the microcomputer circuit board.
See (2) 1 to 3.
2 Remove the side panel (left) clamping screw.
(One PTT screw 4 x 16, indicated by O)
3 Remove the side panel (right) clamping screw.
(One PTT screw 4 x 16, indicated by O)
4 Remove the ground wire clamping screw.
(One PTT screw 4 x 8, indicated by O)
5 Remove the panel holder (left) clamping screws.
(Four PTT screws 4 x 16, indicated by
,Q)
Assembly precaution
Start to affix the panel holder from the screw indicated by Q.
— 29 —
6 Remove the ground wire clamping screw.
(One PTT screw 4 x 8, indicated by O)
7 Remove the panel holder (right) clamping screws.
(Four PTT screws 4 x 16, indicated by
,Q)
Assembly precaution
Start to affix the panel holder from the screw indicated by Q.
8 Remove the exhaust duct clamping screws.
(Three PTT screws 4 x 16, indicated by O)
9 Lift the sections indicated by
,and remove the panel (front).
Assembly precaution
Hook the lead wires on the claw on the panel (front) ( indicated
by O).
Assembly precautions
• Replace the packing used in the disassembled section with
a new one (indicated by O).
• Take care not to twist the packing when installing it.
0 Remove the board fix plate (front) ( indicated by O).
Assembly precaution
Take care not to pinch the lead wires with the board fix plate
(front).
— 30 —
A Remove the light emitting circuit board.
(Unhook the board from the pair of the claws: indicated by O.)
Assembly precaution
Secure the light emitting circuit board firmly with the claws.
(8) Light receiving circuit board (JT-24S-B)
1 Remove the blower. See (5) 1 to 6.
2 Remove the panel (front). See (7) 2 to 9.
3 Remove the clamping screws from the back.
(Eight special screws 4 x 16, indicated by O)
Assembly precaution
Closely fit the panel (under) and the panel (back) together
(indicated by O) before clamping with the screws.
4 Remove the exhaust duct clamping screws.
(Two PTT screws 4 x 16, indicated by O)
Assembly precaution
Take care to install the O ring securely.
5 Remove the panel (under).
— 31 —
Assembly precaution
Confirm that there are no cracks on the panel (under)
(indicated by O).
6 Remove the panel (back).
Assembly precautions
• Replace the packing used in the disassembled section with
a new one (indicated by O).
• Take care not to twist the packing when installing it.
7 Remove the board fix plate (back) clamping screws.
(Two PTT screws 4 x 16, indicated by O)
Assembly precautions
• Replace the packing used in the disassembled section with
a new one (indicated by O).
• Take care not to twist the packing when installing it.
8 Remove the light receiving circuit board from the board fix
plate (back).
(Release the board from the claws at the four places:
indicated by O.)
Assembly precaution
Secure the light receiving circuit board firmly with the claws.
Assembly precautions
• When setting the light receiving circuit board on the board fix
plate (back), confirm the correct mounting direction of the
board. (See photograph.)
• After installing the circuit board, confirm that the LEDs are
not tilting.
— 32 —
Assembly precaution
Run the lead wires within the groove on the side of the base
(indicated by O).
(9) Switch, indicator circuit board (JT-24S-A), and
illumination circuit board (JT-24S-E).
1 Remove the maintenance cover clamping screws. (at the W
marks).
(Four special screws 4 x 16, indicated by O)
2 Remove the maintenance cover, and then remove the cord
band (indicated by O).
3 Remove the tubes (indicated by
).
4 Remove the switch lead wires.
5 Remove the switch by pushing in the direction of the arrow.
Assembly precautions
• Run the lead wires within the groove of the maintenance cover,
and secure them with the tubes.
• Take care not to pinch the lead wires.
6 Disconnect the lead wires, and then remove the indicator circuit
board and the illumination circuit board from the spacers
(indicated by O).
When assembling
• Assemble the unit in the reverse order of disassembly.
• Always make sure that the unit works properly when
reassembled.
— 33 —
12. Parts catalog
Please note the following when using the parts catalog.
1. When ordering parts, always indicate the part number, part name, and the number of
parts required.
2. Parts are not always available, and it may take time for you to receive them.
3. There may be specification improvements.
4. Specifications are correct as of September 2009.
5. Parts marked
are critical for safety. To maintain safety and performance, always
replace these parts with the parts prescribed.
6. The numbers that are circled in the exploded view are the same as the reference
number for the part being indicated.
Description of screw abbreviations
Screw
4
×
Screw diameter
16
Length
Abbreviation
Description
PC screw
PRC screw
PP screw
SW · PP screw
PPT screw
PCT screw
PTT screw
PT screw
SET screw
SQ · SET screw
P · SET screw
PMT screw
HS · SET screw
P · R · W screw
P · C · W screw
P · R · C · W screw
R · W screw
PW · PP screw
SW-PW · PP screw
Cross recess flat head machine screw
Cross recess oval head machine screw
Cross recess pan head machine screw
Cross recess pan head screw with spring washer
Cross recess tapping screw
Cross recess flat head tapping screw
Cross recess truss head tapping screw
Cross recess truss head machine screw
Slotted head stop screw
Square head stop screw
Pan head stop screw
Primer truss head screw
Hexagon head stop screw
Cross recess round wood screw
Cross recess flat head wood screw
Cross recess round and flat wood screw
Slotted round wood screw
Cross recess pan head screw with small washer
Cross recess pan head machine screw with spring washer and flat washer
— 34 —
Model
No.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
JT-SB116EH-G-UL
Parts No.
Y45
X45
Y45
H00
M45
M45
M45
Y45
Y45
Y45
M45
M45
Y45
Y45
M45
Y45
Y45
M45
M45
Y45
Y45
621
608
621
163
664
664
664
621
621
621
664
664
621
621
664
621
621
664
632
621
621
805
809
809
007
833
173
857
801
824
800
823
820
804
807
174
823
368
824
045
825
370
Name of part
Panel(back)
Decoration plate
Decoration plate
PTT screw 4×16
Board fix plate(back)
Circuit board
Packing
Sensor holder
Side panel(left)
Front panel
Panel holder (left)
Exhaust duct
Panel(front)
Board fix plate(front)
Circuit board
Panel(under)
Wiring diagram
Panel holder (right)
Special screw 4×16
Side panel(right)
Decoration plate
Q'ty
Critical Remarks
pcs/unit for safety
1
1
1
31
1
1
1
1
1
1
1
1
1
1
1
1
1
1
5
1
1
３５
Power
JT-24S-B
3000㎜
JT-24S-C
Attention
Price
3
2
1
7
8
7
6
5
16
4
15
14
13
7
12
11
21
10
9
4
4
4
4
18
20
17
19
— 36 —
JT-SB116EH-G-UL
Model
No.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
JT-SB116EH-G-UL
Parts No.
Y45
M45
X45
H00
M45
Y45
Y45
M45
D41
Y45
M35
H00
M45
M45
Y45
M45
Y45
X45
Y45
Y45
Y45
621
632
608
000
632
621
621
664
233
621
139
312
664
664
621
606
621
608
621
621
621
806
047
802
487
803
817
357
258
018
816
095
007
176
172
819
018
802
803
815
814
813
Name of part
Tank cover
Special screw 4×16
Support piece (left)
PTT screw 4×8
Hook(upper)
Switch door
Decoration plate
Switch
Special screw 4×16
Maintenance cover
Spacer
PTT screw 4×6
Circuit board
Circuit board
Installation panel
Special screw 5×30
Drain tank
Support piece (right)
Base
Fix plate
Hook(lower)
Q'ty
Critical Remarks
pcs/unit for safety
1
9
1
7
1
1
1
1
9
1
3
4
1
1
1
6
1
1
1
1
1
３７
Switch
JT-24S-E
JT-24S-A
Price
36
37
38
39
40
41
42
4
35
32
43
44
45
46
34
33
32
32
31
32
51
32
50
49
48
47
— 38 —
JT-SB116EH-G-UL
8 shows accessory parts.
Model
No.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.
71.
72.
73.
74.
75.
76.
77.
78.
79.
80.
JT-SB116EH-G-UL
Parts No.
M45
M45
Y45
X40
D41
Y45
Y45
Y45
M45
D41
Y45
M45
Y45
Y45
M45
M45
H00
H00
Y45
M45
664
680
621
256
023
621
621
621
664
004
621
632
621
621
632
673
000
056
621
664
858
806
803
228
223
225
820
821
045
363
172
046
812
808
229
227
171
075
400
227
Name of part
Packing
Exhaust duct
Drain pipe
Cord band
Cord clip
Cord bush
Blower cover
Duct cover
Special screw PPT 4×8
Cord band
Circuit board
Special screw 4×50
Air supply duct
Blower case
O ring
Blower stopper
PP screw 4×4
Spring washer(4)
Blower(assy)
Floating rubber
Q'ty
Critical Remarks
pcs/unit for safety
1
1
1
5
2
1
1
1
4
1
1
1
1
1
1
1
1
1
1
1
３９
1200㎜
JT-29M
Price
61
62
61
4
74
75
76
67
77
61
78
61
66
79
4
65
80
64
63
4
32
73
4
72
19
71
70
69
68
— 40 —
JT-SB116EH-G-UL
Model
No.
91.
92.
93.
94.
95.
96.
97.
98.
99.
100.
101.
102.
103.
104.
105.
106.
107.
JT-SB116EH-G-UL
Parts No.
Y45
H00
Y45
Y45
H00
Y45
M45
M45
M34
M45
H00
Y45
Y45
M45
M45
M45
Y45
621
141
608
621
011
621
649
679
981
673
312
621
611
664
664
632
621
818
005
236
822
008
810
226
227
225
179
007
811
223
825
826
228
171
Name of part
Q'ty
Critical Remarks
pcs/unit for safety
Terminal cover
PPT screw 4×20
Terminal block
Terminal block fix holder
PT screw 4×8(BS)
Box(reactor)
Bush
Cord bush
Cord bush
Reactor
PTT screw 4×6
ACL cover
Cord clip
Board cover
Cover
Cord bush
Circuit board
1
2
1
1
2
1
3
1
1
1
3
1
1
1
1
2
1
４１
ML-20-A37-3P
JT-29P
Price
96
95
94
93
92
34
91
95
99
34
98
101
100
97
101
64
102
106
97
103
104
65
105
106
107
4
— 42 —
JT-SB116EH-G-UL
Model
No.
121.
122.
123.
124.
125.
126.
127.
128.
129.
130.
131.
132.
133.
134.
135.
136.
137.
138.
139.
140.
141.
142.
143.
JT-SB116EH-G-UL
Parts No.
Y45
Y45
Y45
M45
Y45
D40
M34
Y45
H00
Y45
M45
Y45
Y45
M13
Y45
Y45
M45
M45
M45
M45
M45
M45
M34
621
621
621
664
621
038
869
611
000
621
664
621
621
104
621
621
611
664
664
664
640
664
660
829
369
833
843
226
344
018
075
430
830
836
828
831
038
832
827
038
228
842
841
226
840
019
Name of part
Casing
Decoration plate
Side casing
Filter
Cord clip
Cord clip
Special screw PTT 4×12
Spring washer(4)
PP screw 4×8
Back cover
Partition
Heater box
Heater plate
SW-PW･PP screw 3×8
Fix plate
Heater
SW-PW･PP screw 4×8
Cord clip
Fuse fix plate
Heater base(right)
Cord bush
Heater base(left)
Special screw 4×8
Q'ty
Critical Remarks
pcs/unit for safety
1
1
1
1
1
1
5
1
1
1
1
1
1
2
1
1
3
1
1
1
1
1
5
４３
Tank
Black
Price
19
121
122
123
125
126
124
127
128
129
130
127
131
97
132
133
143
134
135
136
137
69
138
137
139
140
143
141
142
143
143
— 44 —
JT-SB116EH-G-UL
Model
No.
151.
152.
153.
154.
155.
156.
157.
158.
JT-SB116EH-G-UL
Parts No.
Y45
Y45
Y45
Y45
Y45
Y45
Y45
Y45
621
621
621
621
621
621
621
621
280
220
826
224
219
222
221
223
Name of part
Fuse
Lead wire
Thermistor
Lead wire
Lead wire
Lead wire
Lead wire
Lead wire(set)
Q'ty
Critical Remarks
pcs/unit for safety
1
1
1
1
1
1
1
1
４５
Main-Power
Volume-Display
Main-Display1
Main-Light Receiving
Main-Light Emitting
Price
154
155
156
157
151
152
153
158
46
— 46 —
JT-SB116EH-G-UL
8 shows accessory parts.
Printed in Japan
September, 2009
20 <MEE>