Panasonic NA-126MB1WSA User manual

Service Manual
Front Load Washing Machine
NA-126MB1WSA NA-126MB1LSA
NA-475MB1WSA NA-475MB1LSA
NA-126MB1WAS NA-126MB1LAS
NA-127MB1WAS NA-127MB1LAS
NA-148MB1WAS NA-148MB1LAS
NA-127MB1LZA NA-148MB1LZA
Model No.
Product Color : White/Silver
Destination : India
KSA
UAE
Oman
South Africa
Kuwait
12 EXPLODED VIEW AND PART LIST ................... 44

1 Precaution
3
When performing troubleshooting and part replacement during servicing, note the
following safety
precautions:
1.1 Safety Precautions
1.1.1 Use Genuine Parts
The components of the washing machine have safety features such as non-combustibility
and voltage with standing. Therefore, always use the same part as suggested by the maker.
In particular be sure
to use only designated parts in case of major safety parts identified by the marker.
1.1.2 Grounding
Connect the grounding wire to the shell plate ,and bury it under at least 25cm of earth:
alternatively, connect the ground wire to the appropriate pin on a properly grounded
power receptacle. Never connect the wire to a telephone line, lightning rod, or gas pipe.
1.2 Servicing Precautions
1.2.1Observe Warnings
Be sure to follow special warning and precautions that are described on part labels and in
the owner'
manual.
1.2.2 Parts Assembly and Wiring
Be sure to use insulation material(such as tube and tape).And be sure to restore all parts
and wires to their original position. Take special care to avoid contact with sharp edges.
1.2.3 Perform Safety Checks after Servicing
After servicing, check to see that the screws, parts, and wiring are restored to their
original positions, and check the insulation between the external metals and the socket
plug. In addition, place the washing machine in a level position (less than1 degree)to
prevent vibration and noise during operations.
1.2.4 Insulation Checks
Pull out the plug from the power receptacle, pour water into the spin tub, and then set
the timer.
Check to see that the resistance insulation between the terminals of the plug and the
externally
exposed metal is greater than 1M .
Note :When it is impossible to insulation check with a 500V insulation resistance
tester, use other testers for inspection.

1.3 CAUTIONS FOR SAFETY
•Please observe the following notes for safety.
•The symbols indicate as follows.
4
Symbol Meaning
WARNING
Indicates possibility of death or serious injury of a repair
technician and a person nearby through the misconducted
work , or of a user by a defect of the product after the work
performed by the technician.
CAUTION
Indicates possibility of injury or physical damages* of a
repair technician and a person nearby through the
misconducted work , or of a user by a defect of the product
after the work performed by the technician.
Symbol Meaning
ELECTRIC SHOCK
Indicates a caution (including a warning).
Specific instruction is followed by a graphic or characters in
or near.
Symbol left warns an electric shock.
DO NOT DISASSEMBLE
Indicates prohibition (act must not be conducted).
Specific instruction is followed by a graphic or characters in
or near.
DO NOT Symbol left warns not to disassemble.
UNPLUG
Indicates forcing (act must be conducted).
Specific instruction is followed by a graphic or characters in
or near .
Symbol left warns to unplug the power cord.
* Means secondary damages of property, furniture , domestic animal and pet.
Symbol Meaning
OUT OF CHILD
Advise the customer to keep children out of the work place.
Children may be injured with a tool or a disassembled part.
UNPLUG POWER
Unplug power cord for the work such as disassembling
which is not
unnecessary to power on . Do not hold the plug by a wet hand.
Failing to unplug may cause an electric shock.
USE REPAIR PARTS
Use the specified repair parts when repairing the product.
Otherwise , amalfunction or a defect may occur.
Also , a short circuit , ignition or other danger to the
customer may occur.
1 PRECAUTION

5
WARNING
CHECK INSULATION
RESISTANCE
After repair, measure insulation resistance between the
charging part(power cord plug) and the non-charging
metallic part (ground) with an insulation resistance meter
(500V).The resistance shall be 10M or more.
Failing to check the insulation resistance may cause a short
circuit, electric shock or other diseases to the customer.
DO NOT MODIF
Do not modify the product.
An electric shock or ignition may occur.
DO NOT MODIFY
Only a repair technician can disassemble and repair.
An electric shock, ignition or malfunction may cause injury.
USE EXCLUSIVE
SOCKET
Use an exclusive 110 VAC/15 A socket for the washing
machine.
Use an exclusive 220VAC/17A socket for the washing
machine.
Otherwise , an electric shock or ignition may cause. Sharing
the same socket with other instrument causes heating of a
branch socket and result in a fire.
CONNECT
GROUNDING WIRE
Connect the grounding wire.
Failing to do so may cause an electric shock when a short
circuit occurs.
Consult an electric work shop or a sales shop.
DO NOT USE WET
PLACE
Do not install in a bath room or a place exposed to wind or
rain.
An electric shock or a short circuit may cause a fire.
DO NOT SPLASH
WATER
Do not pour or immerse electrical parts into water or liquid
solution.
An electric shock or ignition may occur.
REMOVE DUST
Wipe off dust adhered to the plug of power cord.
Dust may cause a fire.
AVOID
INFLAMMABLE
Do not put inflammable into the washing tub.
Do not put cloths stained with kerosene, gasoline, benzene,
thinner, alcohol, etc. lt may cause a fire or explosion.
1 PRECAUTION

6
WARNING
DO NOT TOUCH
Do not touch the laundry before the spin basket stops
completely.
The laundry entangles your hand causing an injury even if
the basket rotates slowly. Pay special attention to children.
INSTALL
CAREFULLY
Ask an electric work shop to install the product.
Install the product securely and safely according to the
electrical equipment technical standard and the wiring
standard.
Incorrect work causes an electric shock and a fire.
DO NOT PULL
Do not pull the power cord when unplugging.
Hold the power plug to unplug.
An electric shock or short circuit may cause a fire.
DANGER HAND
Do not insert your hand under the washing machine during
operation.
There is a rotary part under the machine which may cause
an injury.
WATER LEAKAGE
Before starting washing, open the faucet and check water
supply hose joint which shall not be loosened for no water
leaks.
The loose screw or hose joint may cause water leakage
resulting in an unexpected damage.
1 PRECAUTION

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12

14
4 Wiring Diagram/PCB Layout
4.3 PCB Layout(Universal Motor )
1 Moto
2 Inlet Valve & Drain Pump & Door Lock
3 Moto Tacho
4 Temp Sensor & Water Sensor
5 Noise Filter & Heater
6 Noise Filter & Drain Pump & Door Lock
1
2
3
4
5
6

5 FACTORY PATTEN DETECTION
16
5.1 Service mode
Before entering into service mode, make sure no water remains in the inner
drum, if not, select drain only program to drain them out.
Turn on the machine and take turns [K3] [K5] [K3] [K5] buttons in 10s.
Press [K1] or [K2] to select test program. Press [K8] to confirm your selection and
start the selected test. If you want to go back to test selection interface, press
the [K8] to cancel previous selection.
LED
Display
Check
Target
Check Method
Check Item
t01
Version
switchover
1. Press [K8] button
2. Press [K2] to confirm switchover
3. Press [K3] to change version
4. Press [K2] button continuously for
3s to confirm your change
LED displays“0xx”
x means current
version
t02
Error code
checking
1.
Press [K8] button
2. Press [K1] to show the last code and press
[K2] to show the next code
3.
Press [K2] and [K3] button at the same
time continuously for 3s, after hearing the
beep, all the error codes records deleted,
LED displays E00.
LED displays
“Err”
t03
Version
information
checking
1. Press [K8] button Enter into service mode,
LED displays “cod”.
2.
Press [K8], LED displays project number.
3.
Press [K1] button, LED displays version
number
LED displays version
number

5 FACTORY PATTEN DETECTION
17
5.1 Service mode
LED
Display
Check
Target
Check Method
Check Item
t04
UI Checking
Press [K8] button
The whole LED
display flashes
t05
Drain
-
pump
checking
Press [K8] button to drain out all the
remaining water. If all water drained out, LED
displays “EP”
，
and 6 minutes later ,if there is
still water remains in it, LED displays “FP”
LED displays “PPt”
t06
Pressure
switch
checking
1.
Press [K8] button to activate inlet valve.
LED displays level frequency once water
lever get the main wash level.
LED displays LL
t07
Water
temperature
sensor and
heater
checking
Press [K8] button to activate the main inlet
valve and get the water lever to heating level
then turn on the heater and 5
mins
later turned
off automatically
LED displays the
current
temperature
t08
Inlet valve
checking
1.
Press [K8] button, LED displays “uu”and
switch on the main wash inlet valve for 10
min.
2. Press [K1] button, LED displays “u1” and
switch on prewash valve for 5s.
3. Press [K1] button, LED displays “u2” and
switch on the main wash inlet valve for 5s.
4.
Press [K1] button to switch on main wash
and prewash valve and get the water lever
to setting level, then drain out the water.
LED displays “UU”

5 FACTORY PATTEN DETECTION
18
5.1 Service mode
LED
Display
Check
Target
Check Method
Check Item
t09
Rotating
checking
Press [K8] button, inner drum rotates in
45r/m clockwise for 15s and stop for 10s then
rotates counterclockwise for 15s, over and over
again.
LED displays
“
tUB”
t10
Spin speed
checking
Press [K8] button , the number on the
display goes up in the same pace with the real
speed and when it reach 400rpm, you need to
press [K1] button to get the machine to reach
its target speed
LED displays “spn”

19
- Turn on the machine , to take turns 【K3】【K5】【K3】【K5】,the door locked,
enter the test mode, display the T01, press the 【K1】or 【K2】to show “T15”.
- Press [K8] button, put into the function test mode, display TST, then press again,
display version number and project number;
- Press 【K1】or 3 seconds later again, display the temperature of NTC;
- Press 【K1】or 3 seconds later again, display water level frequency;
- Press 【K1】or 3 seconds later again, display “U2”,main wash valve is open;
- Press 【K1】or 3 seconds later again, display “U1”,main wash valve is close ,pre-
wash valve is open;
- Press 【K1】or 3 seconds later again, display “PuP”, pre-wash valve is close, drain
pump is open;
- Press 【K1】or 3 seconds later again, display “HEA”, drain pump is close , HTC is
open;
- Press 【K1】or 3 seconds later again, the heater is close ,the motor rotates forward 3
seconds, stop 2 seconds, display the motor speed, accelerate to 1000 rpm;
- Press [K8], display the “T15”, back to the function test mode. Exit need to close
the power.
5.3 Marketing-show (no-water testing)
The sales display mode can not be used in this PCB.
5 FACTORY PATTEN DETECTION
5.2 Self-check

6. MALFUNCTION CODES AND EXPLANATIONS
20
Malfunction
code Reason Possible cause Solution
E10
In 3 minutes,
the water level
doesn’t
change with
valves open
The water level
doesn’t changed in 3
minutes during filling
the water.
If the washer fills very slowly, the
water pressure from the house
might be too low. If the water inlet
valve isn't leaking and there are
no other symptoms this problem
does not need to be corrected.
Water inlet hose Make sure that water faucet is
turned on and that the screens on
the hoses are not restricted.
Water inlet
valve
(The voltage on
the water inlet
valve is normal)
If the water pressure is good, try
cleaning the screens inside the
water inlet valve hose connection
ports. If those are clean replace
the water inlet valve.
Water level
sensor or
control switch
(No voltage on
the water inlet
valve)
A water lever control switch
controls how much water enters
the washing machine by PCB. If
the water level control switch is
defective, or more commonly, if
the small air pipe attached to the
air bell restricted, The switch will
not be able to close the electrical
contacts to the washer fill valve.
CHECK THE AIR PIPE
CHECK THE WATER LEVERL
SENSOR
CHECK THE PCB and the inner
wire between PCB and the sensor
E12
The water
level in drum
exceed a
certain level
for alarm
Restart Sometimes just restart the unit
can solve the problem.
Water inlet valve
(The voltage on the
water inlet valve is
normal)
If the washer is overflowing, the
water inlet valve has failed.
Replace it.
Water level
sensor or
control switch
(No voltage on
the water inlet
valve)
A water lever control switch
controls how much water enters
the washing machine by PCB. If
the water level control switch is
defective, or more commonly, if
the small air pipe attached to the
air bell restricted, The switch will
not be able to close the electrical
contacts to the washer fill valve.
CHECK THE AIR PIPE
CHECK THE WATER LEVERL
SENSOR
CHECK THE PCB and the inner
wire between PCB and the sensor

6. MALFUNCTION CODES AND EXPLANATIONS
21
E21
In 3 minutes,
the water level
doesn’t
change with
pump started
Drain hose
If the washer won't drain water
check the drain hose. Be sure the
hose did not get kinked behind
the washer. Also, remove the
hose from the pump and check it
for obstructions.
pump
If the washer won't drain water
the drain pump might be
defective. It's also common for a
small sock or other article of
clothing to get caught in the drain
pump or in the drain hose. Check
both for an obstruction before
replacing the pump.
PCB Check the PCB
E30
Door can’t be
unlocked with
over 3 time’s
fail.
Door lock Check the door hook and the door
lock to get correct location.
PCB
If the washer door won't unlock
the problem might be the main
The PCB. This is not common.
Check the inner wire between the
PCB and the door lock.
E33
The PCB can not
detect the signal
of the water level
sensor.
Water level sensor Check the water level sensor
Check the PCB the inner
wire between PCB and the sensor
E34 Temperature
sensor fail
The temperature
sensor(NTC) get
broken
Check the NTC
E60 The motor don’t
drive
The motor don’t drive
for 5 times
1.Check the PCB and the motor
2.Check the motor communicate
wire

6. MALFUNCTION CODES AND EXPLANATIONS
22
E61
The speed don’t
transmit signal
The PCB can’t get
speed transmit signal
when the motor drive
1.Check the speed transmit line of
the motor to prevent fall
of
2.Check the PCB and the motor
3.Check the motor communicate
wire
E62
The speed
don’t transmit
signal
abnormality
Triac
get broken
1.Check the speed transmit line
of the motor to prevent fall of
2.Check the PCB and the motor
3.Check the motor
communicate
wire