Panasonic NR-BU303MNHK User manual

Order No. PAPTH120404CE
(Revision : Jan. 2013)
Service Manual
Refrigerator
NR-BU303MNHK
NR-BU343MNHK
NR-BU343MNX1
NR-BU303SNHK
NR-BU343SNHK
NR-BU343SNX1
Product Colour
Clear Stainless Silver (MN/S)
Champagne (SN/N)
Destination
Hong Kong, India
© Panasonic Appliances (Thailand) Co., Ltd. 2013.
All rights reserved. Unauthorized copying and
distribution is a violation of law.
There are special components used in this equipment which are important for safety. These parts are marked by
in the Schematic Diagrams, Circuit Board Diagrams, Exploded Views and Replacement Parts List. It is essential that
these critical parts should be replaced with manufacturer’s specified parts to prevent shock, fire or other hazards. Do
not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
WARNING
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.
CFCs have been used in refrigerant as refrigerator and the insulation materials for many years. But it
is now known that these compounds which once seemed so ideal for use as cleaning agents and in
refrigeration systems, destroy the earth’s ozone layer as a result, an international body decided on a
total worldwide ban of harmful CFCs by the end of 1995.

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CONTENT
Page
3
4
5
6
7
8
9
10
11
12
13
14 - 16
17
1. Safety Cautions for Repairing
1.1 Warning
1.2 Caution
2. Specification and Components
2.1 NR-BU303 SERIES
2.2 NR-BU343 SERIES
3. Schematic Diagram
4. Performance Data
5. Troubleshooting Guide
6. Disassembly Instruction
6.1 Led Cover
6.2 Plate Duct PCT
7. Parts Exploded View and Replacement Parts List
7.1 Part Exploded View : Body
7.2 Part Exploded View : Door
7.3 Part Exploded View : Packing
7.4 Replacement Parts List : NR-BU303 / NR-BU343
Detail Change Notice
NR-BU303 / BU343

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1. SAFETY CAUTIONS FOR REPAIRING
When you repair the refrigerator, please kindly take care for the following cautions.
1.1 Warning
Before repairing unit, unplug supply cord
• Before you repair the refrigerator, please unplug the supply cord.
Use authentic parts when repairing
• When you replace the parts, please use authentic parts to replace defective parts.
Caution during brazing
• When you use touch for brazing, please ensure ventilation.
Otherwise, you will be poisoned by carbon monoxide.
Pay attention to using refrigerant
• If refrigerant touches fire, the gas becomes poisonous gas.
Pay attention to getting electricity shock
• When you check the voltage of terminal, please do not touch the electricity part terminal.
• When you replace the parts, please wait for 3 minutes at least for discharging capacitor.
Check safety after repairing
• Check the screws, parts, lead wires to take in place.
• Check the repairing portion whether circumferential parts are damaged or not.
• Check insulation resistance between supply plug and earth.
• When install refrigerator, check condition of supply cord and plug.
• Wipe off the dust on plug.
• Cutting and seal the electric device carefully.
1.2 Caution
Watch the hot parts
• During operation and after operation, compressor and pipes are hot.
• Also, under these condition, heater are hot.
• Do not burn your fingers when you touch it.
Pay attention to refrigerant
• Do not touch liquid refrigerant. Otherwise your hands may be burnt.
Pay attention to edge of parts
• Otherwise, your fingers may be cut.
Pay attention to fins of evaporator and condenser
• Otherwise, your fingers may be cut.
Before transportatin, adjust the bolt
• Otherwise, the floor may be damaged.
Do not touch the pipe after brazing
• Otherwise, your hands may be burnt.
NR-BU303 / BU343

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2. SPECIFICATION AND COMPONENTS
2.1 NR-BU303 SERIES
Model
Specification
Destination
Code Attached Model
Power Source
Plug
Colour Model
Colour Code
System Spec.
Material Spec.
Hong Kong
NR-BU303
EUW86E87RAW
220V, 50Hz
S3P
MN, SN
S, N
Induction
PCM = SN, Stainless = MN
HK
Capacity
(Total Gross Volume)
FC
External Dimension [ W x D x H ]
Internal Dimension
[ W x D x H ] PC
296L
(FC : 92L, PC : 204L)
600 x 629 x 1542 (mm.)
472.6 x 343 x 497.8 (mm.)
513.6 x 426.7 x 828 (mm.)
Installation Space Side : 50 mm min. / Back : 100 mm min. / Top : 300 mm min.
Temperature Control
Type
Rating
Radiant Heater
Full automatic temp. control equipment
PC : Control board
MM6 - 8V48
Type
Charging Amt.
Type
Charging Amt.
Type
Rating
Type
Rating
Type
Rating
Type
Rating
Type
Rating
Type
Rating
Type
Rating
Type
Rating
Defrosting Control Defrost Cycle
Inner Liner
Insulation
Net Weight
(1) Ambient temp. over 33°C, 8.5h
(2) Ambient temp. 25°C ~ 33°C, 8.5h
(3) Ambient temp. under 16°C, 16h
401405L
4 µF - 400V
5TM189MFBYY - 53
PTH7M330MD2
(4) Power on 4h (Rated time)
220V / 150W
Vacuum formed ABS resin / Cabinet and door
Cyclopentane (DSD421.21) / Cabinet and door
52 Kg
Sealed Unit
Compressor
Evaporator
Condenser
Refrigerant
Lubricating Oil
Fin and tube type
Single wall steel tube (Zinc coat)
R - 600a
55 ± 5g
Freol
α -10
190 ± 5ml
MM1-6180B, Closed temp. (Normal) -1.0 ± 1.5°C
Electric Part
Door Switch
Temperature Baffle Damper
Fan Motor
Compressor Motor
PC Sensor (PCC)
Ambient Temp.
Sensor (ATC)
Defrost Thermal
Fuse
Running Capacity
Overload Protector
LED Lamp PCB / 12V, 60 mALight Irradiantion Device (PC)
Starting Relay
Defrost Sensor
(DFC)
S.P. - S.T. / D3D - 121 (Omron)
250V / 0.5A
FBA11J14VXA Prop fan (Box type)
DC 14V / 1.54W under applied fan ø90 mm.
Split phase induction motor, EQ-BR97, 220V 50Hz / 2 poles
119.3 W
NTC
B = 3808K / R0 = 6.409KΏ± 1%
NTC
B = 3819K ± 2%
R10 = 3.899KΏ± 3%
NTC
Micro Temp.
250V / 10A / 73°C
B = 3435K ± 1%
R25 = 10.0KΏ± 3%
NR-BU303 / BU343

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2.2 NR-BU343 SERIES
Model
Specification
Destination
Code Attached Model
Power Source
Plug
Colour Model
Colour Code
System Spec.
Material Spec.
India / Hong Kong
NR-BU343
EUW91E92RAW
230V, 50Hz / 220V, 50Hz
B3P / S3P
MN, SN
S, N
Induction
PCM = SN, Stainless = MN
1N / HK
Capacity
(Total Gross Volume)
FC
External Dimension [ W x D x H ]
Internal Dimension
[ W x D x H ] PC
342L
(FC : 92L, PC : 250L)
600 x 629 x 1722 (mm.)
472.6 x 343 x 497.8 (mm.)
513.6 x 426.7 x 1008 (mm.)
Installation Space Side : 50 mm min. / Back : 100 mm min. / Top : 300 mm min.
Temperature Control
Type
Rating
Radiant Heater
Full automatic temp. control equipment
PC : Control board
MM6 - 8V48
Type
Charging Amt.
Type
Charging Amt.
Type
Rating
Type
Rating
Type
Rating
Type
Rating
Type
Rating
Type
Rating
Type
Rating
Type
Rating
Defrosting Control Defrost Cycle
Inner Liner
Insulation
Net Weight
(1) Ambient temp. over 33°C, 8.5h
(2) Ambient temp. 25°C ~ 33°C, 8.5h
(3) Ambient temp. under 16°C, 16h
401405L
4 µF - 400V
5TM189MFBYY - 53
PTH7M330MD2
(4) Power on 4h (Rated time)
220V / 150W
Vacuum formed ABS resin / Cabinet and door
Cyclopentane (DSD421.21) / Cabinet and door
53.5 Kg
Sealed Unit
Compressor
Evaporator
Condenser
Refrigerant
Lubricating Oil
Fin and tube type
Single wall steel tube (Zinc coat)
R - 600a
55 ± 5g
Freol
α -10
190 ± 5ml
MM1-6180B, Closed temp. (Normal) -1.0 ± 1.5°C
Electric Part
Door Switch
Temperature Baffle Damper
Fan Motor
Compressor Motor
PC Sensor (PCC)
Ambient Temp.
Sensor (ATC)
Defrost Thermal
Fuse
Running Capacity
Overload Protector
LED Lamp PCB / 12V, 60 mALight Irradiantion Device (PC)
Starting Relay
Defrost Sensor
(DFC)
S.P. - S.T. / D3D - 121 (Omron)
250V / 0.5A
FBA11J14VXA Prop fan (Box type)
DC 14V / 1.54W under applied fan ø90 mm.
Split phase induction motor, EQ-BR97, 220V 50Hz / 2 poles
119.1 W
NTC
B = 3808K / R0 = 6.409KΏ± 1%
NTC
B = 3819K ± 2%
R10 = 3.899KΏ± 3%
NTC
Micro Temp.
250V / 10A / 73°C
B = 3435K ± 1%
R25 = 10.0KΏ± 3%
NR-BU303 / BU343

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3. SCHEMATIC DIAGRAM
3P
NR-BU303 / BU343

- 7 -
NR-BU303 / BU343
4. PERFORMANCE DATA
4.1 NR-BU303 SERIES (India)
Control Setting
Mean Fresh Food Compartment Temperature
Mean Freezer Load Temperature
(°C)
(°C)
(°C)
(kWh / 24 hrs)
(°C)
t3 (°C)
Vegetable Case Temperature
PC Door Shelf Upper Temperature
PC Door Shelf Bottom Temperature
Power Consumption
* Under on - load and ambient temperature 32 ± 1°C
-0.5 ± 2.5 3.0 ± 2.5 8.0 ± 2.5
-29.5 ± 2.5 -20.0 ± 2.5 -9.0 ± 2.5
Running Ratio (%) 85.0 ± 15
4.0 ± 2.5
1.6 or under
35.0 ± 1555.0 ± 15
- 4.5 ± 2.5 -
-
-
-
6.0 ± 2.5 -
-
-
“ 3 ”PC
FC
“ 2 ” “ 1 ”
“ 3 ” “ 2 ” “ 1 ”
4.2 NR-BU303 SERIES (Other)
Control Setting
Mean Fresh Food Compartment Temperature
Mean Freezer Load Temperature
(°C)
(°C)
(°C)
(kWh / 24 hrs)
(°C)
t3 (°C)
Vegetable Case Temperature
PC Door Shelf Upper Temperature
PC Door Shelf Bottom Temperature
Power Consumption
* Under on - load and ambient temperature 32 ± 1°C
-1.5 ± 2.5 3.0 ± 2.5 8.0 ± 2.5
-28.0 ± 2.5 -19.5 ± 2.5 -9.0 ± 2.5
Running Ratio (%) 85.0 ± 15
4.0 ± 2.5
1.8 or under
35.0 ± 1560.0 ± 15
- 5.0 ± 2.5 -
-
-
-
5.0 ± 2.5 -
-
-
“ 3 ”PC
FC
“ 2 ” “ 1 ”
“ 3 ” “ 2 ” “ 1 ”
4.4 NR-BU343 SERIES (Other)
Control Setting
Mean Fresh Food Compartment Temperature
Mean Freezer Load Temperature
(°C)
(°C)
(°C)
(kWh / 24 hrs)
(°C)
t3 (°C)
Vegetable Case Temperature
PC Door Shelf Upper Temperature
PC Door Shelf Bottom Temperature
Power Consumption
* Under on - load and ambient temperature 32 ± 1°C
-1.5 ± 2.5 3.0 ± 2.5 8.0 ± 2.5
-27.0 ± 2.5 -22.0 ± 2.5 -9.0 ± 2.5
Running Ratio (%) 85.0 ± 15
4.0 ± 2.5
1.8 or under
35.0 ± 1560.0 ± 15
- 5.0 ± 2.5 -
-
-
-
6.0 ± 2.5 -
-
-
“ 3 ”PC
FC
“ 2 ” “ 1 ”
“ 3 ” “ 2 ” “ 1 ”
4.3 NR-BU343 SERIES (India)
Control Setting
Mean Fresh Food Compartment Temperature
Mean Freezer Load Temperature
(°C)
(°C)
(°C)
(kWh / 24 hrs)
(°C)
t3 (°C)
Vegetable Case Temperature
PC Door Shelf Upper Temperature
PC Door Shelf Bottom Temperature
Power Consumption
* Under on - load and ambient temperature 32 ± 1°C
-0.5 ± 2.5 3.0 ± 2.5 8.0 ± 2.5
-28.5 ± 2.5 -23.0 ± 2.5 -9.0 ± 2.5
Running Ratio (%) 85.0 ± 15
4.0 ± 2.5
1.6 or under
35.0 ± 1560.0 ± 15
- 5.0 ± 2.5 -
-
-
-
6.0 ± 2.5 -
-
-
“ 3 ”PC
FC
“ 2 ” “ 1 ”
“ 3 ” “ 2 ” “ 1 ”

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NR-BU303 / BU343
5. TROUBLESHOOTING GUIDE
Cause : Not cool at all or not enough
Does the compressor
operating?
Does the fan motor
operating?
Check the ice at the
evaporator.
Does any oil leak out?
Plug out to stop the
compressor and
check gas spout out
by cutting cap tube
around 35 mm. from
dryer.
Check the start
control circuit.
NONO
YES
YES
YES
YES
NO NO
YES
No ice
or only at the inlet
NO
It’s very few ice
YES
Use
method
Gas spout out at both side
Gas spout out at dryer side only
Gas spout out at evaporator side only
Check pressure of the
motor compressor by
ohmmeter.
Rip/Burn coil.
Check oil color of the
compressor.
(Clean the pipe according
to guidance)
Check the fan
motor circuit.
Clogged moisture.
Gas leakage.
Check the gas
smell.
Defect compressor
Clogged in the cap
tube system at the
evaporator side.
Clogged in the cap
tube system at the
dryer side.
Cutting cap tube
out of the dryer
side.
Technical Guide
Order No.
TECH091119TG
Compressor ‘s
rotor lock.
Replace the defect of
electric part.
(Capacity, Thermostat,
PTC Relay and Protection)
Check oil color of the
compressor.
(Clean the pipe according
to guidance)
Replace the compressor.
Replace the fan motor.
Cannot repair.
Check oil color of the
compressor.
(Clean the pipe according
to guidance)
Replace the compressor.

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6. DISASSEMBLY INSTRUCTION
6.1 Led Cover
- Take off by use small screwdriver put between gaps of Led cover with Plate duct PCT at lock as Fig. 1
- Use small screwdriver push up the Led cover for lock loose.
- Change Led lamp by take off at Lead wire connection as Fig. 2
- After change Led cover or Led lamp, put Led cover at the top side and slide up in lock position as Fig. 3
- Use hand hit carefully at the right side of Led cover from the top pass to bottom as Fig. 4
Fig. 1 Fig. 2
Fig. 3 Fig. 4
NR-BU303 / BU343

- 10 -
6.2 Plate Duct PCT
Fig. 4 Fig. 5
Fig. 1 Fig. 2 Fig. 3
- Use small screwdriver open at the screw hole cover as Fig. 1
- Take off screws at the Plate duct PCT as Fig. 2
- Take off screws at the Plate duct PCB and Plate duct PC as Fig. 3
- At first, take off at the Plate duct PC as Fig. 4
- After that take off at the Plate duct PCB and other parts as Fig. 5
NR-BU303 / BU343