Panasonic NR-B37MV2 User manual

Order No. PHAT070202S3

(Revision : Jul. 2011)

Service Manual

Refrigerator

NR-B37MV2

NR-B41MV2

Product Colour

Silver (SL)

Destination

Thailand

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.

- 2 -

CONTENT

Page

1. Safety Cautions for Repairing

1.1 Warning

1.2 Caution

2. Specification and Components

3. Performance Data

3.1 NR-B37MV2

3.2 NR-B41MV2

4. Self Protecting Function

4.1 Protecting for IC

4.2 Protection for compressor locked

4.3 Protection for power supply droping

5. Self Diagnoising Function

6. Temperature Control

7. Refrigerator Instruction Guideline

8. Troubleshooting Guide

8.1 Not cool at all [ Both PC & FC (compressor does not operate) ]

8.2 Cool, not enough [ Both PC & FC (compressor operates) ]

9. Schematic Diagram

9.1 Wiring Connection Diagram

10. Parts Exploded View and Replacement Parts List

10.1 Part Exploded View : Body

10.2 Part Exploded View : Door

10.3 Part Exploded View : Packing

10.4 Replacement Parts List : NR-B37MV2, NR-B41MV2

11. Detail Change Notice

NR-B37MV2 / NR-B41MV2

- 3 -

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-B37MV2 / NR-B41MV2

- 4 -

2. SPECIFICATION AND COMPONENTS

Destination

Model

Plug

Power Source

Specification

Thailand

NR-B37MV2 / NR-B41MV2

C2P

220V AC 50Hz

Capacity

External

Dimensions

Width (mm)

Depth (mm)

Height (mm)

Net Weight (Kgs.)

Temperature Control

Defrosting

Freezer Star Rating

Exterior Finish (cabinet / door)

Inner Liner

Insulation

355L / 395L

(FC :102, PC : 253 / 293)

675

695

1629 / 1769

69 / 72 Kgs.

FC : Electronic control (PCB)

PC : Baffle damper thermostat

Full-automatic heater deater defrost with a timer

Full-automatic heater (Forcibly evaporated into the air)

PCM color / PCM color - (Polyester paint coating / Polyester paint steel)

Vacuum fomed ABS resin

Polyurethane foam (cabinet / door)

Electric Parts

PC Heater

Door Switch

Fan Motor

Fan Blade

Type

Rating

Lamp Bulb

PTC Relay

Defrost Timer

Defrost Heater

Motor Protector

Running Capacitor

Defrost Sensor

(DFC)

Type

Rating

FC Sensor

(FCC)

Temperature Fuse

Resistance wire vinyl covered heater 3.14W / 220, 3.22W/M, 15421 ohms

D3D - 121

250V / 0.5A

DC 14V / 1.54W

Ø 90mm. prop fan (Box Type)

E14 / 22, 240V / 15W

PTH7M330MD2

Radiant heater MM6 - 4343 220V / 183W

MM3 - 20DCW

4µF - 400V

PTC

B = 3819K ± 2%

R = 3.899KΩ± 3%

PTC

-30

B = 3850K ± 2%

R = 18.9KΩ± 1.8%

250V / 10A / 73°C

PAS-B37MV2 / B41MV2 (Control Board)TYPE

Electronic PCB Control

(1) Ambient Temp. over 34°C 7h ADD

(2) Ambient Temp. 28°C ~ 33°C 7h ADD

(3) Ambient Temp. 11°C ~ 27°C 7h ADD

(4) Ambient Temp. cover 10°C 13h ADD

(5) Power ON 4h ADD

Sealed Unit

Compressor

(Winding Resistance at 20

°C

Evaporator

Condenser

Refrigerant Type

Charge

Oil Charge

ETI57C13DCH-C0ECS

Fin tube type

Wrapper type (concealed condenser)

HFC - 134a 130 gm

130 gm

215ml 9 (Freol ∝ ~ 10)

NR-B37MV2 / NR-B41MV2

- 5 -

3. PERFORMANCE DATA

3.1 NR-B37MV2

Thermostat Dial Setting

Mean Fresh Food Compartment Temperature t3 (°C)

(°C)

(kWh/Day)

Mean Freezer Load Temperature

Vegetable Crisper Temperature

PC Door Shelf Upper Temperature

Egg Tray Temperature

PC Door Shelf Bottom Temperature

Power Consumption

(%)Running Ratio

“ 3 ” “ 2 ” “ 1 ”

1.0 ± 2.5 3.5 ± 2.5 6.5 ± 2.5

-21.5 ± 2.5 -19.5 ± 2.5 -15.0 ± 2.5

- 4.5 ± 2.5 -

- 6.0 ± 2.5 -

- 8.0 ± 2.5 -

- 5.0 ± 2.5 -

75 ± 1585 ± 15

1.4

60 ± 15

3.2 NR-B41MV2

Thermostat Dial Setting

Mean Fresh Food Compartment Temperature t3 (°C)

(°C)

(%)

Mean Freezer Load Temperature

Vegetable Crisper Temperature

PC Door Shelf Upper Temperature

Egg Tray Temperature

PC Door Shelf Bottom Temperature

Running Ratio

(kWh/Day)Power Consumption

“ 3 ” “ 2 ” “ 1 ”

1.0 ± 2.5 4.0 ± 2.5 7.0 ± 2.5

-22.0 ± 2.5 -19.5 ± 2.5 -16.0 ± 2.5

- 4.5 ± 2.5 -

- 6.0 ± 2.5 -

- 4.0 ± 2.5 -

- 5.0 ± 2.5 -

1.8

85 ± 15 75 ± 15 60 ± 15

NR-B37MV2 / NR-B41MV2

- 6 -

4. SELF PROTECTING FUNCTION

4.1 Protection for IC

IC order to stop compressor completely.

YES

After 1 hour.

SYSTEM PROTECT CONTROL CYCLE

1st time

OPERATE each 7min X 10 times

COMPRESSOR 1hour STOP

OPERATE each 7min X 10 times

SYSTEM PROTECT CONTROL CYCLE

333rd time

STOP COMPRESSOR

YES

IC cancels to stop compressor.

Normal operating?

After restarting, does “Stop compressor”

occure 10 times within 2 min?

IC cancels to stop compressor.

Normal operating?

After 10 min., does PCB check if IPM protect

signal is normal?

Does system protection cycle for 333 times?

IC orders to stop compressor for 10 min.

Does IC receive IPM protect signal?

• IC continues to stop compressor until 1 hour.

• IC indicates Self Diagnosing sign.

• IC continues to stop compressor until 1 hour.

• IC indicates Self Diagnosing sign.

• Normal operating.

NR-B37MV2 / NR-B41MV2

- 7 -

4.2 Protection for compressor locked

IC order to stop compressor completely.

YES

After 1 hour.

SYSTEM PROTECT CONTROL CYCLE

1st time

OPERATE each 7min X 10 times

COMPRESSOR 1hour STOP

OPERATE each 7min X 10 times

SYSTEM PROTECT CONTROL CYCLE

333rd time

STOP COMPRESSOR

YES

IC cancels to stop compressor.

Normal operating?

After restarting, does “Stop compressor”

occure 10 times within 2 min.?

IC cancels to stop compressor after 10 min.

Does system protection cycle for 333 times?

IC orders to stop compressor for 10 min.

• After starting 2 sec., does IC detect

rpm < 5r/sec.?

• After starting from 2-10 sec., does PCB

detect rpm over 120r/sec.?

• IC continues to stop compressor until 1 hour.

• IC indicates Self Diagnosing sign.

• Normal operating.

NR-B37MV2 / NR-B41MV2

- 8 -

4.3 Protection for power supply droping

YES

After 1 hour.

YES

IC cancels to stop compressor.

Normal operating?

After restarting, does “Stop compressor”

occure 10 times within 2 min?

IC cancels to stop compressor.

Normal operating?

After 10 min., does PCB check power supply

voltage if it is > 180V AC?

IC orders to stop compressor for 10 min.

Does power supply voltage drop as condition

> 0.1 sec. and < 160V AC?

• IC continues to stop compressor until 1 hour.

• IC indicates Self Diagnosing sign.

• IC continues to stop compressor until 1 hour.

• IC indicates Self Diagnosing sign.

• Normal operating.

NR-B37MV2 / NR-B41MV2

- 9 -

5. SELF DIAGNOSING FUNCTION

1. Opening PC door and FC door,

Push “Quick Freezing” bottom more than 5 sec.

2. Blinking LED of “Energy Saving” and “Quick Freezing”

during 3 sec.

3. After blinking at 3 sec., each LED show as below.

How to use “Self Diagnosing” function

Symptom Details of symptom Energy Saving

LED

Quick Freezing

LED

Normal None None

Abnormal of FCC thermistor Break/Short of FCC thermistor None Blinking

Abnormal of DFC thermistor Break/Short of DFC thermistor None Turn on

Abnormal of ATC thermistor Break/Short of ATC thermistor Blinking Turn on

Abnormal of defrost heater in FC Break/Short of defrost heater Turn on None

Abnormal of INV compressor Operate protector of IPM lock

Operate protector of voltage dropping

Operate protector of over voltage

Turn on Blinking

Abnormal of FC fan motor Break/Lock of FC fan motor

Abnormal revolution of FC fan motor

Turn on Turn on

Abnormal of PCB Error of communication

Error of EEPROM

Blinking Blinking

NR-B37MV2 / NR-B41MV2

Energy Saving

Quick Freezing

- 10 -

6. TEMPERATURE CONTROL

How to operate the “QUICK FREEZING” (Quick cool button)

If you want the refrigerator to freeze quickly in order to

preserve the food, press the “Quick Freezing” button

(green light LED turns on).

The system will operate immediately and will stop

operating automatically (green light LED turns off)

when it runs for 150 minutes.

And the operation will return to normal mode.

Remark

• If you want to stop the operation, press the “Quick Freezing”

button (green light LED turns off).

The system will return to normal mode.

• If the green light LED is flashing, it means that the defrosting

system is now working. The quick freezing system will start

the operation right after the defrosting operation is finished.

How to use the “ENERGY-SAVING” operation

When food storage is small or during nighttime and people out of home (when door opening frequency

is low), the “ENERGY-SAVING” operation saves electricity consumption by operating the compressor

at a lower speed than the normal operation.

How to save energy

• Press the “ENERGY SAVING” button. (green light turns on)

• Press the “ENERGY SAVING” button again to stop the operation. (green light turns off)

About energy saving

• Deodorizing function reduces.

• Interior temperature gets slightly higher.

• The “ENERGY SAVING” operation stops when the power cord is reconnected or after recovering from

a power failure.

• When the “ENERGY SAVING” is activated during “QUICK FREEZING”, the “ENERGY SAVING” starts

after completing the “QUICK FREEZING”

• Frequent opening of the doors raise the interior temperature.

(Higher interior temperature automatically activates normal operation on a temporary basis.)

NR-B37MV2 / NR-B41MV2

Energy Saving

button

Quick Freezing

button

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