Panasonic NC-TXF22 User manual

Order No. PAPTH130602CE
Service Manual
Electric Thermo Pot
NC-TXF22
NC-TXF30
Product Colour
Deep Gray (H)
Pink (P)
Destination
Thailand, Malaysia
© Panasonic Appliances (Thailand) Co., Ltd. 2013.
All rights reserved. Unauthorized copying and
distribution is a violation of law.
The service information is designed for experienced repair technicians only and is not designed for use by the general
public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting
to service a product. Products powered by electricity should be serviced or repaired only by experienced professional
technicians. Any attempt to service or repair the product or products dealt within this service information by anyone
else could result in serious injury or death.
WARNING
M
RA
WPEEK LIOB

- 2 -
CONTENT
NC-TXF22, NC-TXF30
Page
3
4
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
22
23 ~ 25
1. Cautions for safe repair work
2. Specification
3. Problem checking
3.1 Thermo pot performance test mode
3.2 Dismantle procedure for failure diagnotics
3.3 Check points
3.4 Failure diagnostics chart
4. Disassembly and Reassembly instructions
4.1 Bottom plate and Body
4.2 Feed water pipe
4.3 Thermal fuse comp. and Thermistor comp.
4.4 Case A comp.
4.5 Lamp assy unit
4.6 How to remove Decoration panel (Display part)
4.7 Peg frame
4.8 Guage cover
4.9 Lid comp. and Inner lid
4.10 Lid packing and Steam way A
4.11 Lid and Pump comp.
4.12 Valve A, Spring B and Seal ring
4.13 Shaft
4.14 Lock knob A, Lock spring A and Lock spring B
4.15 Supporting plate
4.16 Stopper comp.
4.17 Lock lever A (Assemble - Remove knob)
4.18 Upper frame
4.19 Thermal fuse comp. assembly
4.20 Thermostat assembly
4.21 How to paste Decoration panel
4.22 Shaft assembly
4.23 Valve A, Seal ring and Spring B assembly
4.24 How to check Pump comp.
4.25 Recheck
5. Production No. position
6. Body efficiency check
7. Parts Exploded View and Replacement Parts List
7.1 Parts Exploded View : Body
7.2 Parts Exploded View : Packing
7.3 Replacement Parts List

- 3 -
1. CAUTIONS FOR SAFE REPAIR WORK
To prevent accidents during repair work, injury or property loss to the users, safety instructions are described
below.
WARNING
CAUTION
This indicates “ the possibility of death or serious injury ”
This symbol indicates caution to be careful.
This symbol indicates compulsory action that must be followed.
This indicates “ the possibility of injury or property loss ”
(Below symbols are examples)
1.1 Degree of loss or potential for injury is classified as follows.
1.2 Safety instructions are classified with symbols as below and
explanations are described as follows.
After the repair, replace the original wiring layout.
Otherwise the lead wires may contact any rotating parts or adjacent components causing
failure, electric shock or fire.
Make sure to use specified parts.
Make sure to use specified parts if indicated with the symbol in circuit diagram or parts list.
Be careful to avoid electric shock.
Caution
for electric
shock
Disconnect
power plug
During repair service with power on,
such as for voltage measurement, be
careful to avoid electric shock around
charged battery portion or lead wire
terminals.
WARNING
Disconnect power plug while repairing.
Disassembling, assemble and replace
parts after disconnecting the power
source. Failure may cause electric
shock or injury.
Wear gloves while disassembling, replacing or assembling.
Make sure to wear gloves while power is on to avoid injury from sharp metal edges or electric
shock during service work.
CAUTION
NC-TXF22, NC-TXF30

- 4 -
2. SPECIFICATION
MODEL NC-TXF22 NC-TXF30
Thailand
220V 50Hz / C2
670W
670W
2.2 L
22.2 x 29.4 x 27.4 cm
1.9 Kg
Thailand
220V 50Hz / C2
670W
670W
3.0 L
22.2 x 29.4 x 31.1 cm
2.0 Kg
Thermostat
360˚ Rotatable with the power cord
157˚C (2 Thermal fuses)
Approx. 1 M
Malaysia
240V 50Hz / S3
635W
635W
3.0 L
22.2 x 29.4 x 31.1 cm
2.0 Kg
Destination
Power Supply
Power Consumption
(approx.)
Capacity (approx.)
Dimensions (approx.) [ W x D x H ]
Weight (approx.)
Thermal Regulation
Rotating Base
Thermal Fuse
Power cord
Air pumpHot water supply method
170 ml / 5 secCurrent volume adjustment range
Push supporting plateOperation Method
Push stopperPump-Lock
Additional functions : Overheating protection, Air pump, Lock knob (Air pump type).
Hot water supply device specifications
Rated
Boiling
NC-TXF22, NC-TXF30

- 5 -
3. PROBLEM CHECKING
3.1 Thermo pot performance test
mode
Please follow check operating detail below, before
start to check the problems.
LED symbol for this instruction show as below.
How to operate
1. Pour approx. 1000 ml water into the container.
2. Supply with 220V/240V electric power.
Instruction
1. Long Boil/Reboil LED will be lighted and LED
will be blink and start to boil water.
2. After 9~10 min., LED will be lighted and
change to keep warm state.
Boiling and Keep warm test
Blink
Lighted
NC-TXF22, NC-TXF30
M
R
A
W
P
E
E
KL
I
O
B
NC-TXF30
Water supply mark
Approx. 1000 ml.
220 V
KEEP WARM BOIL
KEEP WARM BOIL

- 6 -
NC-TXF22, NC-TXF30
1. Remove 2 tapping screws and 1 truss head
screw from bottom plate.
2. Remove 1 screw and sleeve from body.
3. Remove white, orange lead wire and earth wire
from peg frame.
4. Remove body off.
5. Remove water proof cover B.
3.2 Dismantle procedure for failure
diagnotics
3.3 Check points
Do not do maintennance and re-use if copper
pattern on PCB is broken.
Thermo pot may break down by static
electricity from clothes, human body,
workbenches, etc., when touch or
wonder to touch should to ground
human body with several MΩ.
Note
CAUTION
Tapping screw
(M4 x 12)
Truss head screw
Bottom plate
Sleeve
Screw A
Body
Insert the direction to Pin Base where Faston Terminal
is inserted so that the curl part may become direction
of this figure. (2 positions)
Discharge gap / Malaysia model
# Tighten the screw securely and completely, allowing no
gap between the screw head and the counterpart.
# The additional-tightening torque shall be 70~120N • cm
(7.1~12.2kgf • cm).
# Tighten the screw securely and completely,
allowing no gap between the screw head and
the counterpart.
# The additional-tightening torque shall be
80~200N • cm (8.2~20.4kgf • cm).
# Tighten the screw securely and
completely, allowing no gap between
the screw head and the counterpart.
# The additional-tightening torque shall be
50~100N • cm (5.1~10.2kgf • cm).
Pan Head Tapping Screw
Deltite Screw
Faston Terminal shall be securely inserted to the end.
Earth Wire Assy
Wire Q
Funen Ban
Wire B
View B
Wire A
Funen Tube
Wire S
Wire L
Wire P
Wire J
Wire I
Lead Wire Ban
# Insert the Lead Wire Ban for hold the Lead Wire Assy J, K and P.
# Lead Wire Ban shall be twisted 2 round or more before and after
insert Lead Wire Assy J, K and P.
# Insert the direclion to Terminal Plate where Funen Ban and
Funen Tube is inserted so that the curl part may become
direction of this figure.(2 positions)
Lead Wire Assy J, K, P
# Do not contact on sharp points of
Container when apply force 200N.
Deltite Screw x2
Wire K
Wire G
Wire F

- 7 -
NC-TXF22, NC-TXF30
3.4 Failure diagnostics chart
3.4.1 No power. (There is no power indication)
When the above parts are normal
When the above parts are normal Replace the Control unit A (bottom).
Replace the Control unit B (operation).
Replace the Power cord.Is there connection in the power cord? (0Ω)Power cord
Replace the Thermal fuse comp.Is there connection across the blue lead wire on the
peg frame?
Thermal fuse comp.
ActionDiagnostics MethodCheck
The items in the Check correspond to those shown in Check Point on P. 6.
3.4.2 Water is not boiling. (Water pour out)
Replace the Container comp.Is there connection across the boiling heater?
(approx. 70Ω) (between the brown and the red
portions)
Boiling heater
Replace the Control unit A (bottom).When the above parts are normal
ActionDiagnostics MethodCheck
The items in the Check correspond to those shown in Check Point on P. 6.
4. DISASSEMBLY AND REASSEMBLY INSTRUCTIONS
4.1 Bottom plate and Body
1. Remove 2 tapping screws and 1 truss screw
from bottom plate.
2. Remove 1 screw and sleeve from body.
3. Remove black, white lead wire and earth
wire from peg frame.
4. Remove body off.
FIG. 1
Tapping screw
(M4 x 12)
Truss head screw
Bottom plate
Sleeve
Screw A
Body

- 8 -
NC-TXF22, NC-TXF30
4.2 Feed water pipe
FIG. 2
1. Remove 1 screw off.
2. Remove bushing from water pipe packing A
and container comp.
3. Remove feed water pipe from communicating
bushing.
Tapping scraw
(M4 x 8)
Feed water pipe
Communicating
bushing
Water pipe
packing A
Water pipe
comp.
Container
comp.
1. Remove 2 screws of cover plate.
2. Remove blue and red lead wire of heater
terminal.
3. Remove cover plate from container.
4. Remove thermal fuse comp. from cover
plate.
5. Remove hold spring A from cover plate.
6. Rotate thermistor 90°to remove it.
4.3 Thermal fuse comp. and
Thermistor comp.
FIG. 3
Operating point
Careful thermistor leans when assemble with
cover plate.
Do not forget to put compound.
Remove white, blue and red lead wires with
wrench.
Tapping screw (M4 x 8)
Thermal fuse
comp.
Container comp.
Thermostat
Hold spring A
Cover plate
Heater
terminal

- 9 -
1. Remove water pipe comp., and then remove
case A comp.
2. Pull off ball A from case A comp.
4.4 Case A comp.
FIG. 4
NC-TXF22, NC-TXF30
4.5 Lamp assy unit
1. Remove 2 screws off.
2. Remove board holder B off. (Pull upside)
3. Remove LED holder off.
4. Lean board holder B claw and pull lamp
assy unit to remove.
FIG. 5
Operating point
When remove lamp assy unit, please do in 1
set in order to not forget seal packing F.
Board holder B
Claw
Water pipe
comp.
Case A
comp.
Ball A
Tapping screw
(M3.5 x 12)
(2 pcs)
Board holder B
LED holder

- 10 -
NC-TXF22, NC-TXF30
4.6 How to remove Decoration
panel (Display part)
FIG. 6
Open (A point) with minus screwdriver of small
pin.
A
FIG. 7
4.7 Peg frame
1. Remove body follow the instruction.
2. Remove bottom ring upside with minus
screwdriver or etc.
3. Remove 1 screw off.
4. Use minus screwdriver to pry between 2 ribs
of peg frame and body, and then push out
peg frame with thumb, then pull it off.
FIG. 9
Bottom ring
Peg frame
Tapping screw
(M4 x 12)
Minus
screwdriver
KEEP WARM BOIL

- 11 -
Press clear part of gauge cover from inner
body by thumb and remove it.
4.8 Gauge cover
FIG. 8
Body
Push by thumb
Gauge cover
NC-TXF22, NC-TXF30
1. Remove 4 screws off.
2. Remove Inner lid off.
4.9 Lid comp. and Inner Lid
FIG. 9
Tapping screws (M4 x 10)
Inner lid
Packing A
Seal packing B
Lid comp.

- 12 -
NC-TXF22, NC-TXF30
4.10 Lid packing and Steam way A
1. Remove steam way A.
2. Remove lid packing.
FIG. 10
Steam way A
Lid packing
FIG. 11
4.11 Lid and Pump comp.
1. Remove 4 screws off.
2. Use minus screwdriver to pry between lid
and pump comp.
Tapping screw
(M4 x 10)
Pump comp.
Lid

- 13 -
NC-TXF22, NC-TXF30
1. Remove valve A from pump comp.
2. Remove spring B off.
3. Remove seal ring from valve A.
4.12 Valve A, Spring B and Seal ring
Valve A
Seal ring
Spring B Leg
Push
Leg
FIG. 12
Push lower part of pump comp., and push 4 legs of shaft then pull out.
4.13 Shaft
FIG. 13
Shaft
Push Leg Leg
Shaft
Push
Push
Push

- 14 -
NC-TXF22, NC-TXF30
4.14 Lock knob A, Lock spring A and Lock spring B
1. Catch lock spring A by wrench and pull out.
2. Follow the first section and remove lock
Spring B.
3. Remove lock knob B off.
FIG. 14
Lock spring A
Lock spring B
Lock knob B
FIG. 15
4.15 Supporting plate
1. Adjust lock pin of supporting plate at
“Release”.
2. Remove supporting plate off.
Operating point
When assemble, make sure that caution label
is on the correct position.
Supporting plate
Lid slot
Supporting plate

- 15 -
NC-TXF22, NC-TXF30
1. Adjust lock pin of stopper comp. at “Release”.
2. Put minus screwdriver into stopper comp., gap and use power to remove it.
4.16 Stopper comp.
FIG. 16
Operating point
After assemble, should to feel to touching of supporting plate on lock knob.
Stopper comp.
Bottom up thermo pot and press lock lever A deepest then pust it down and pull out.
4.17 Lock lever A (Assemble - Remove knob)
FIG. 17
Lock lever A
Remove this portion
as shown with arrow

- 16 -
NC-TXF22, NC-TXF30
1. Remove all the components attached to the
cover plate and remove the cover plate.
2. Remove the case A comp.
3. Remove the control unit B (operation).
4. Remove the upper frame from the container
comp.
4.18 Upper frame
FIG. 18
Upper frame
FIG. 19
4.19 Thermal fuse comp. assembly
Assemble thermal fuse comp., on cover plate
follow Fig. 19.
Operating point
When assemble thermal fuse comp., should
not make thermal fuse moved.
Should not make force (pull, bend, twist) on
thermal fuse comp.
Thermal fuse comp.
Cover plate

- 17 -
NC-TXF22, NC-TXF30
1. Set 2 ribs of hold spring A on cover plate
to assemble thermostat assy.
2. Assemble hold spring A on cover plate.
4.20 Thermostat assembly
Paste Decoration panel tightly.
4.21 How to paste Decoration panel
Operating point
Paste from A-point before and follow the
arrow direction.
Peel of scratch protection sheet from decoration
panel surface.
FIG. 20
Thermostat
Hold spring A
Cover plate
Spring grooves
position
KEEP WARM BOIL
A
FIG. 21

- 18 -
NC-TXF22, NC-TXF30
FIG. 22
4.22 Shaft assembly
Set 4 legs of shaft into groove of pump comp., as picture below.
Shaft
Shaft
Leg Leg
Slot
1. Assemble seal ring on valve A, then assemble spring B.
2. Set 4 legs of valve A of pump comp., as picture below.
4.23 Valve A, Seal ring and Spring B assembly
FIG. 23
Operating point
Flat side of sealing should reach to base of valve A.
Valve A
Seal ring
Spring B
Leg
Hole
•Picture when remove Spring B. to make
more understand how to set Valve A

- 19 -
NC-TXF22, NC-TXF30
Use finger to Block position, and push tightly to prevent air leak from Lid.
(If there is some rebound on Pump Comp., it means OK.)
4.24 How to check Pump comp.
FIG. 24
Operating point
Assemble pump comp., to lid after check air leak.
If do not set packing lid well, it may not withstand pushing reaction. (Packing lid should not be open)
①
Lid packing
Valve A
Push
4.25 Recheck
After assembly please recheck water leak, insulation resistance and operation, those are usual
or unusual.
: Measure by 500VDC insulation meter, the result should be more than 2MΩ.
(Measuring between 2 pins of plug and screw)
Insulation resister
: Should stand 1000VAC for one minute.
(Measuring location is same as INSULATION RESISTER)
Insulation resistance
: Thermo pot performance test mode (P. 5) and operation is usual or unusual.
Current check

- 20 -
NC-TXF22, NC-TXF30
5. PRODUCTION NO. POSITION
Production No. is located at bottome plate.
Production date
6. BODY EFFICIENCY CHECK
Amount of Pouring-out water checking.
Allowance : Amount of water should be 160±30 ml.
1. Pour water into the container and change to boiling state. Waiting to keep warm mode.
2. Measure amount of pouring-out water after change to keep warm immediately.
3. Push on supporting plate to pump water for once and measure amount of pouring-out water.
For this test, please careful hot water.
CAUTION