Mitsubishi Electric JT-MC206GS-W-E User manual

HAND DRYER
HANDBOOK
Nameplate
Repair work must be performed by
the manufacturer, its service agent or
a similarly qualified person in order to
avoid hazards.
November 2012 No. U186-A
Model: JT-MC206GS-W-E

Contents
1. Safety precautions .................................................................... 3-4
2. Features ....................................................................................... 4
3. Names and functions of components ....................................... 4-5
4. Specifications .............................................................................. 5
5. Outside dimensions
..................................................................... 6
6. Electrical wiring diagram ............................................................. 6
7. Circuit board diagram ................................................................... 7
8. Fundamentals of operation ....................................................... 8-9
9. Troubleshooting..................................................................... 10-13
10. How to call.................................................................................. 14
11. Service inspection list................................................................. 14
12. Overhauling procedures ........................................................ 15-21
13. Parts catalog ......................................................................... 22-28

─3 ─
Read the following precautions thoroughly before the maintenance, and then inspect and repair the product in a
safe manner.
The types and levels of danger that may arise if the product is handled incorrectly are described with the warning
symbols shown below.
Warning
Modification is prohibited
Do not modify the unit.
(Failure to heed this warning may result
in electric shock, fire and/or injury.)
Electric shock
If you must inspect the circuitry while the power is
on, do not touch the live parts.
(Failure to heed this warning may result
in electric shock.)
Check insulation
Upon completing repair work, always measure the
insulation resistance. Verify that it is at least 10 MΩ
(with a 500 V DC insulation resistance tester), and
then turn on the power.
(Inadequate insulation may result in
electric shock.)
Incorrect handling of the product may
result in serious injury or death.
Caution Incorrect handling of the product may result in minor injury
or damage to properties including buildings and equipment.
Proper electric work
• Use the electric wires designated for electric work,
and conduct electric work in accordance with the
"Electric Installation Engineering Standard", the
"Indoor Wiring Regulations" and the installation
instructions.
• Make sure that the terminals and fixed wiring are
securely connected.
(Improper connection or wiring installation
may result in electric shock and/or fire.)
Use proper parts and tools
For repair, be sure to use the parts listed in the
service parts list of the applicable model and use the
proper tools.
(Failure to heed this warning may result in
electric shock, fire and/or injury.)
Caution against
electric shock
Prohibited
Be sure to follow
this instruction.
Turn off the power
Make sure to turn off the earth leakage breaker
and the power switch of the product's main unit
prior to starting repair work. (The charge voltage in
the circuitry remains for another 30 seconds or so,
even after the power is turned off and the LED is
unlit; therefore, wait for at least 30 seconds before
disassembling the product.)
(Failure to heed this warning may result
in electric shock.)
Be sure to follow
this instruction.
Wear gloves
Always wear a pair of gloves during inspection or
repair work.
(Failure to heed this caution may result in
injury.)
1. Safety precautions
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Be sure to follow
this instruction.
Scratches and deterioration
Make sure to replace scratched and/or deteriorated
wiring and lead wires.
(Failure to heed this warning may result
in electric shock and/or fire.)
Be sure to follow
this instruction.

─4 ─
2. Features
3. Names and functions of components
(1) Names of components
Tank cover
(Lid)
Nozzle
Sensor
Drain tank
Water receiver area
Decorated panel
(Front cover)
Power lamp
Hand drying area
The inside of the front cover
Air speed
switch
Heater lamp
Heater switch
Air speed
lamps
Power lamp
Power switch
Open
Setting switches
Filter
(Air filter)
*Shaded areas in the figure indicate antibacterial material (excluding nozzle areas).
Decorated panel
(Front cover)
Checking the settings
Once settings are made, the heater lamp and air speed lamps turn
off after about 10 seconds (to save energy).
To check the settings, press either the heater or air speed switch.
Make sure that the product operates properly upon completion of repair. Clean the product and the surrounding
area, and then notify the customer of the completion of repair.
Request for repair
●Before repairs, take the product off the wall.
●Inspect the earth condition, and repair it if it is incomplete. Make sure that an earth leakage breaker or an over-
load protection device is installed, if it is not installed, recommend the dealer to install one.
●Check whether the filter and the drain tank are installed securely in place.
●Do not leave a towel or other objects in the hand-drying area.
●Never place any objects on the main body nor cover it.
●Make sure that the product is not being used in any of the following locations:
• Outdoors
• Locations where the temperature could be lower than 0ºC
• Locations where the temperature could be higher than 40ºC
• Locations where there is a lot of dust
• Locations where there is a lot of condensation
• Locations where salt damage could occur
• Vehicles (including ships and airplanes)
• Locations where corrosive, neutral, or reductive gases are present.
• Near food or tableware.
• Kitchens
• Locations where the product may come into direct contact with water. (Where there is a risk of water
splashing.)
• Locations where the product is in direct sunlight or strong light (It may cause sensor malfunction)
• Rooms that have a sterilization basin, swimming pools, bathrooms.
• Although compact in size, easy-to-use with a wide hand drying area
• The wave nozzle has reduced power consumption and noise.
• Joints of hand drying area has been reduced.
• Exteriors can be cleaned by wiping with alcohol.
• The square design matches various architectural space.

─5 ─
4. Specifications
Model
Rated
voltage
(V)
Rated
frequency
(Hz)
Heater Air
speed
Rated
current
(A)
Power con-
sumption
(W)
Air
speed
(m/s)
Noise
(dB)
Weight
(kg)
Drain tank
capacity
(ℓ)
JT-MC206GS-W-E
220-240
Single
phase
50-60
ON HIGH 3.4-3.5 735-825 140-150 62-64
5 0.6
LOW 2.1-2.3 390-455 90-100 52-54
OFF HIGH 2.2-2.4 475-560 140-150 62-64
LOW 1.5-1.7 175-220 90-100 52-54
• Air speed is calculated from the static pressure measured by the pitot tube (at the nozzle).
• Noise is the A range value measured in an anechoic room. (Average of the three points: 2 m from the front and
both sides of the unit.)
(2) How to open/close the front cover
Gap
Connecting
part of the
front cover
Hook of
the main
unit
Notes for opening/closing the front cover
If the front cover comes off, reattach it by the following
procedures.
1.
2.
3.
1. Pull the tab to open the front cover. 2. Hold the handle on the right hand
side of the main unit.
3. Open the front cover.
Close the front cover in the reverse order of opening
procedure.
Close the front cover so that there is no gap between
the front cover and the main unit, and push the tab in
to latch the front cover.
&KHFNWRVHHWKDWWKHIURQWFRYHULVILWWHG
securely.
Press the upper and lower parts of the front
cover against the main unit to close the cover
securely.
NOTE
Gap
1 Close the right side. 2 Close the left side (both
the upper and lower parts).
Tab
Main unit
Front cover
Main unit
Front cover
Handle
Open
Tab
Main unit
Front cover
How to close the front cover
Pull
Push
Click
How to open the front cover
*If the front cover is opened too wide, it will come off to
prevent damage to the main unit.
Fit the lower connecting part of the removed front
cover into the lower hook of the main unit.
Fit the upper connecting part of the front cover into
the upper hook of the main unit.
Check that the front cover is attached securely.
When closing the front cover, make sure that there
is no gap between the front cover and the main unit.

─6 ─
6. Electrical wiring diagram
CN4
7
7
1
1
CN1
CN2
Heater
TAB2
TAB1
TAB3
CN8
CN6
Terminal block
Power
supply
220-240V
5
CN3
1
50-60Hz
Sensor circuit board
250V 20A
FUSE1
LED2
LED1
LED3 LED5LED4 LED6
1
7
1
5
TAB4
Thermal fuse 94°C
Thermal fuse 94°C
Thermal
Blower
Red Red
Blue
Blue
Blue
L
N
Brown
Ferrite
core
Ferrite
core
JT-33D JT-33M JT-33P
CN7
7
1
Fan Information
JT-MC206GS
Overall Efficiency % 52.1
Measurement Category C
Efficiency Category static
Efficiency Grade 61
A variable speed drive is
integrated within the fan.
JT-33S
250V 5A
FUSE2
250V 5A
FUSE3
94°C
fuse
Power
switch
Display circuit board
5. Outside dimensions
Filter
Power switch With the front cover open
Heater switch
Air speed switch
Terminal block
Power cord hole
(rear) Conduit box
Mounting hole position
on the lower part of the unit
Top surface of
a washstand, etc.
Floor surface
Recommended dimensions for A and B
Space under
the unit
When there is
no object
When there is
an object such
as a washstand
Men
Women
Location
Above
Left
Right
Front
Below
Clearance
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Clearances from walls or other
objects must be larger than
those listed below.
Unit: mm

─7 ─
Circuit thermostat characteristics (JT-33M: IC1 7P and JT-33P: IC1 8P)
Temperature
20°C
40°C
60°C
3.44 V
2.38 V
1.47 V
12.6 V
(JT-33P: C125)
5 V
(JT-33M: CN2 4P)
0 V
(JT-33M: CN2 7P)
Clock frequency
8 MHz
(JT-33M: IC1 15P)
Reset input
5 V
(JT-33M: IC1 11P)
IC1 7P and 8P Voltage
Power supply voltage: 220 to 240 V AC
(JT-30P: Between TAB1 and TAB2)
7. Circuit board diagram
Circuit board diagrams and check points

─8 ─
8. Fundamentals of operation
Descriptions of circuit operation
(1) Notes for turning the power switch ON / OFF
1When 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 dry-
ing area. In the meantime, the microcomputer (IC1) of the main unit performs the initial settings.
2When 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
1A range sensor is used as the hand detection sensor.
2When the sensor detects hands, the blower motor turns on and the hand dryer starts to operate.
3Once operation has started, it continues as long as the sensor detects hands.
4If 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).
5The 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
1The air speed can be changed by pressing the air speed switch (SW1).
2The hand dryer has two air speed settings.
3The 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
4The 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
1To regulate inrush current at startup, the heater turns on 0.5 seconds later than the blower motor.
2The 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

─9 ─
(5) Operating procedures for the test mode: indicating the number of operation/
operating time
1How to start the test mode: Turn ON the power switch while holding down both of the heater switch and air
speed switch. At this time, the power lamp blinks fast (ON for 0.1 seconds/OFF
for 0.1 seconds).
2Lighting status of the heater lamp shows the contents of the indication.
• The heater lamp ON : The cumulative number of operation of the blower
• The heater lamp OFF : The cumulative operating time of the blower
Use the heater switch to switch between ON and OFF.
3
The air speed lamps (HIGH and LOW) and check lamps (1 and 2) indicate the cumulative number of operation.
• Display digit: A 4-digit display (Check lamp 2 (LED 6) indicates a hundred-thousands digit, check lamp
1 (LED 5) indicates a ten-thousands digit, HIGH lamp (LED 4) indicates a
thousands digit, and LOW lamp (LED 3) indicates a hundreds digit.)
• Display range: 100 to 999900 times
• Display method: The number of blinking (ON for 0.2 seconds/OFF for 0.2 seconds) of each lamp indicates
the numeric value for each digit, and the pattern of blinking repeats in a 6-second cycle.
(See examples 1 and 2.)
4The air speed lamps (HIGH and LOW) and check lamps (1 and 2) indicate the cumulative operating time.
• Display digit: A 4-digit display (Check lamp 2 (LED 6) indicates a thousands digit, check lamp 1 (LED 5)
indicates a hundreds digit, HIGH lamp (LED 4) indicates a tens digit, and
LOW lamp (LED 3) indicates a ones digit.)
• Display range: 1 to 9999 hours
• Display method: In the same way as described above. (See examples 1 and 2.)
1
Check lamp 2
Check lamp 1
HIGH lamp
LOW lamp
Repetition
(0.2 seconds + 0.2 seconds) × 9 = 3.6 seconds
6.0 seconds
987
6
5432
1987
6
5432
1987
6
5432
1987
6
5432
Example 2: In the case of 246800 times, or 2468 hours
Example 3: In the case of 100 times or less, or 1 hour or less
Power lamp: Fast blinking (ON for 0.1 seconds/OFF for 0.1 seconds)
HIGH lamp, LOW lamp, check lamp 1, and check lamp 2: OFF
Example 1: In the case of 999900 times or more, or 9999 hours of more
5During the test mode, the hand dryer only performs the above indication, and does not perform any other
operations including blowing air.
6How to finish the test mode: Turn OFF the power switch, and wait for about 30 seconds. Turn ON the power
switch again, and then the mode returns to the normal operation.
Check lamp 2
Check lamp 1
HIGH lamp
LOW lamp
187
6
5432
16
5432
1432
12
Repetition
6.0 seconds

─10 ─
Error Display Cause Check Method and Remedy
Power
Heater
LOW
HIGH
Check 1 Check 2
(The hand dryer does not
operate, and no lamps light
up.)
Connector discon-
nection
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 nor-
mal, replace the power circuit board (JT-33P).
Resistance Judgment
0 ΩNormal
Malfunction of the
power switch
To check the power switch operation ON/OFF, measure the resist-
ance 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.
Switch Resistance Judgment
ON state 0 ΩNormal
OFF state ∞ΩNormal
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).
Heater lamp
(LED 2)
LOW lamp
(LED 3)
HIGH lamp
(LED 4)
Power lamp
(LED 1)
Check lamp 1
(LED 5)
Check lamp 2
(LED 6)
Description of the error display
: ON : OFF : Slow blinking (ON for 0.4 seconds/ OFF for 0.4 seconds)
Troubles with error display
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 earth leakage
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.

─11 ─
Error Display Cause Check Method and Remedy
Power
Heater
LOW
HIGH
Check 1 Check 2
(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.
If the connector is not disconnected, replace the display circuit
board (JT-33D).
(If a light-emitting device of the display circuit board (JT-33D) is in
a state of short circuit or open fault, the lamps do not light up.)
Malfunction of
the control circuit
board (JT-33M)
If the error persists after performing the above, replace the control
circuit board (JT-33M).
Power
Heater
LOW
HIGH
Check 1 Check 2
(Tamper-proof timer)
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
Dirty sensor
window
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).
Dirty sensor
window
Dirt may shield the sensor.
Wipe the dirt off the sensor window.
Malfunction of
the control circuit
board (JT-33M)
If the error persists after performing the above, replace the control
circuit board (JT-33M).
Power
Heater
LOW
HIGH
Check 1 Check 2
(Power failure)
Connector discon-
nection
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)
Power supply
noise
If there is power supply noise, use a noise filter for the power line
or take other noise-control measures.
Is the connector on the display
circuit board (JT-33D) or the one
on the control circuit board (JT-
33M) securely connected?

─12 ─
Error Display Cause Check Method and Remedy
Power
Heater
LOW
HIGH
Check 1 Check 2
(Motor error)
Connector dis-
connection 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).
Power
Heater
LOW
HIGH
Check 1 Check 2
(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).
Power
Heater
LOW
HIGH
Check 1 Check 2
(Temperature detection er-
ror (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 oc-
curs again.
Malfunction of
the power circuit
board (JT-33P)
If the error persists after performing the above, replace the power
circuit board (JT-33P).
Power
Heater
LOW
HIGH
Check 1 Check 2
(Temperature detection er-
ror (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 oc-
curs again.
Malfunction of
the control circuit
board (JT-33M)
If the error persists after performing the above, replace the control
circuit board (JT-33M).
Power
Heater
LOW
HIGH
Check 1 Check 2
(Control circuit board error)
Malfunction of
the control circuit
board (JT-33M)
Replace the control circuit board (JT-33M).

─13 ─
Symptom Cause Check Method and Remedy
The hand dryer does not
blow warm air.
Malfunction of the
heater switch
After checking that the connector is securely connected, meas-
ure the resistance across the heater switch on the display circuit
board (JT-33D). If the resistance is not normal, replace the dis-
play circuit board (JT-33D).
Switch Resistance Judgment
ON state 0 ΩNormal
OFF state ∞ΩNormal
Blown thermal
fuse of the heater
Measure the resistance between the heater lead connectors (red
and white).
If it is ∞Ω, replace the heater (PTC).
Ambient tempera-
ture is low.
When the ambient temperature is 18°C or lower, the hand dryer,
which is equipped with the simple heater, does not blow suffi-
ciently warm air.
Malfunction of
the power circuit
board (JT-33P)
If the error persists after performing the above, replace the power
circuit board (JT-33P).
Malfunction of
the control circuit
board (JT-33M).
If the error persists after replacing the power circuit board (JT-
33P), replace the control circuit board (JT-33M).
The hand dryer does not
stop blowing air.
Dirt on the sensor
area
Check if the sensor window gets dirty.
Influence of light Check if the sensor area is exposed to sunlight or strong light.
Malfunction of
the power circuit
board (JT-33P)
If the error persists after performing the above, replace the power
circuit board (JT-33P).
Malfunction of
the control circuit
board (JT-33M)
If the error persists after replacing the power circuit board (JT-
33P), replace the control circuit board (JT-33M).
The air speed can not be
changed.
Malfunction of the
air speed switch
After checking that the connector is securely connected, measure
the resistance across the air speed switch on the display circuit
board (JT-33D). If the resistance is not normal, replace the dis-
play circuit board (JT-33D).
Switch Resistance Judgment
ON state 0 ΩNormal
OFF state ∞ΩNormal
Malfunction of
the control circuit
board (JT-33M)
If the error persists after performing the above, replace the con-
trol circuit board (JT-33M).
The hand dryer does not
blow air even though hands
are inserted.
Hands are too
far away from the
sensor.
Sensitivity range of the sensor is 8 to 13 cm directly below the
sensor.
When inserting hands, place hands close to the sensor.
Troubles without error display

─14 ─
10. How to call
Symptom Remedy
1 The hand dryer does
not blow air even
though hands are
inserted.
(It may not stop
blowing air in the
cases of 4and 5.)
The power lamp is
not turned on.
1If the power wires are disconnected, securely connect
them to the terminal block.
2If the power switch is OFF, turn it ON.
3If the earth leakage breaker is OFF, turn it ON.
Cases other than the
above
4The sensor area may get dirt, clean up the sensor area.
5If some objects are left in the water receiver area, remove
them.
2 The hand dryer does
not blow warm air.
The heater lamp is
not turned on.
1If the heater switch is OFF, turn it ON.
Ambient temperature
is low.
2When the room temperature is 18°C or lower, the hand
dryer, which is equipped with the simple heater, does not
blow sufficiently warm air.
3 Air blow is too weak to dry hands quickly. 1If the air speed is set at LOW, switch it to HIGH.
2If the filter is clogged, clean it up.
4 Water leaks from the product. 1If the drain tank is filled with water, empty the tank.
2If the drain tank is not properly installed, install it properly.
11. Service inspection list
Location Inspection Item Check Result
Electric wiring Are lead wire connectors connected securely?
Is the wiring correct?
Operation Does the hand dryer operate properly?
Isn’t there any abnormal noise, vibration, etc.?
Indicator lamps Do the lamps (LEDs) come on?
Drain tank, filter Are the drain tank and filter inserted into the proper position?
Wall installation Isn’t there any gaps between the product and the back wall?

─15 ─
Panel (assembly)
3Unhook the claws of the panel from the base, and remove the panel
(assembly). (Indicated by )
(2) Display circuit board (JT-33D) and control circuit board (JT-33M)
12. Overhauling procedures
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 earth leakage
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.
• After completing repairs, check that the unit operates properly.
Always wear gloves when servicing.
(1)Turn off the power supply.
1Stop the operation.
2Turn off the earth leakage breaker on the distribution board.
1Remove the drain tank.
2Open the decorated panel, and unscrew the panel clamping screw.
(One special (spl.) screw 4 x 14, indicated by )
4Remove the clamping screw for the display circuit board.
(One PTT screw 4 x 14, indicated by )
5Remove the display circuit board (JT-33D).
Display circuit board (JT-33D)
6Remove the clamping screws for the control circuit board.
(Two PTT screws 4 x 14, indicated by )
7Remove the control circuit board (JT-33M).
Control circuit board (JT-33M)
Assembly precaution
Place the display circuit board (JT-33D) closely to the left side, and
then tighten the screw.

─16 ─
3Remove the sensor circuit board (JT-33S).
Sensor circuit board (JT-33S)
Assembly precautions
• Run the lead wires through the groove of the nozzle. (Indicated by
)
• Take care not to pinch the lead wires.
• After installing the sensor circuit board, make sure that the LED is
upright.
Assembly precautions
• Run the lead wires through the groove of the blower cover.
(Indicated by )
• Take care not to pinch the lead wires.
• After installing the circuit board, make sure that the LEDs are
upright.
Assembly precaution
Run the lead wires through the claw of the blower case. (Indicated
by )
(3) Sensor circuit board (JT-33S)
1Remove the panel (assembly).→See (2) 1to 3.
2First, remove the protector sheet, and unhook the claw of the fix plate
from the nozzle (indicated by ), and then remove the fix plate.
Fix plate
(under the protector sheet)
Protector sheet

─17 ─
PCB cover
4Unscrew the clamping screw for the circuit board (PCB) cover.
(One PT screw 4 x 8, indicated by )
Assembly precaution
Set the entire bends of the PCB cover outside the PCB case.
(4) Switch (power) and power circuit board (JT-33P)
TB cover
1Remove the panel (assembly).→See (2) 1to 3.
2Unscrew the clamping screw for the terminal block (TB) cover.
(One PT screw 4 x 8, indicated by )
Terminal block
3Disconnect the lead connectors from the terminal block. Connector
PCB case
5Disconnect the lead wires from the power circuit board (JT-33P). Power circuit board (JT-33P)
6Unscrew the switch clamping screw.
(One PPT screw 3 x 8, indicated by )
7Remove the switch.
Switch

─18 ─
PCB case
8Unscrew the PCB case clamping screws.
(Two PTT screws 4 x 14, indicated by )
9Unscrew the heat sink clamping screws.
(Two SW PW PP scr M4, indicated by )
Power circuit board (JT-33P)
0Unscrew the clamping screw for the power circuit board.
(One PTT screw 4 x 14, indicated by )
aRemove the power circuit board (JT-33P).
Assembly precaution
Fit the power circuit board (JT-33P) into the claws of the PCB fix
plate. (Indicated by )
Heat sink

─19 ─
Nozzle
(5) Heater (PTC)
1Disconnect the heater lead wires from the power circuit board (JT-
33P). →See (4) 1to 2and 4to 5.
2Unscrew the nozzle clamping screws.
(Four PTT screws 4 x 14, indicated by )
Assembly precaution
Tighten the screws in a crisscross pattern.
Heater (PTC)
3Remove the heater (PTC) with the fix plates (heater).
Assembly precautions
• Run the lead wires through the groove of the blower cover.
(Indicated by )
• Take care not to pinch the lead wires.
Assembly precautions
• Run the heater lead wires as shown in the picture at right.
• Fit the thermal fuse parts into the groove of the fix plates (heater).
(Indicated by )

─20 ─
Blower cover
(6) Blower (assembly) (Thermal fuse of the motor)
1Disconnect the blower lead wires from the power circuit board (JT-
33P). →See (4) 1to 2and 4to 5.
2Push the cord bush into the blower cover. (Indicated by )
Assembly precautions
• Install the cord bush as shown in the picture at right.
• Make sure that there is no slack in the lead wires inside the blower
cover.
Duct
3Unscrew the duct clamping screw.
(One PTT screw 4 x 14, indicated by )
Assembly precaution
Set the duct in the groove of the blower cover. (Indicated by )
Blower cover
4Unscrew the blower cover clamping screws.
(Four PTT screws 4 x 14, indicated by )
Assembly precaution
Tighten the screws in a crisscross pattern.
Cord bush