Mitsubishi Electric MR-FT35EH-SW-C User manual

Changes for the Better
Models MR-FT35EH-SW-C
MR-FT46EH-SW-C
MR-FT51EH-SW-C
CONTENTS
1. SPECIFICATIONS......................................................
2. OUTLINES AND DIMENSIONS...................................
3. WIRING DIAGRAM....................................................
4. REFRIGERANT CIRCUIT...........................................
5. NAME OF THE PARTS...............................................
6. TROUBLE SHOOTING................................................
6.1 TROUBLE CRITERION OF MAIN PARTS............
6.2 TEST POINT DIAGRAM OF MAIN CONTROL
BOARD..............................
6.3 LED TROUBLE DISPLAY AND CHECK
POINT.....................................................................
6.4 IMPORTANCE DETAIL OF FAULT ANALYSIS.....
7. DISASSEMBLY INSTRUCTIONS...............................
8. PARTS LIST...............................................................
2015
SERVICE MANUAL
NO.SM-RE-1508
MITSUBISHI
ELECTRIC
HOME REFRIGERATORS
C..............Taiwan
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1.1 SPECIFICATIONS
MR-FT35EH-C MR-FT46EH-C MR-FT51EH-C
Egg rack
1 pc.
2 pcs.
2 pcs.
Forced air convection
Surround cooling,multi air flow,front air flow
2 pcs.
1 pc.
1 pc.
Automatic control
Shipping
Weight kg
kg
Vegetable case
Drain pan
Unit
Adjust pocket
Bottle pocket
Acrylic resin coated steel
ABS resin
Foamed cyclopenthane
Fin and tube type
Concealed type
Crystal shelf (R)
Automatic (Heater defrost)
Freezer pocket
Slide chilled case
Crystal shelf (F)
Temperature control system
Refrigerator room light
Ice tray
Ice box
Accessories
Bottle stopper
Free pocket
Crystal shelf (RV)
Cabinet
Freezer door
Refrigerator door
Freezer
Refrigerator
Insulation
1
SPECIFICATIONS
110V 60HzPower supply
Total capacity
Dimensions (HXWXD) mm.
L
MR-FT35EH-C
MR-FT46EH-C
MR-FT51EH-C
352 (F : 106 R : 246) 460 (F : 150 R : 310) 510 (F : 150 R : 360)
Cabinet
Evaporator
Foamed cyclopenthane
Foamed cyclopenthane
Food liner
Cooling system
1 pc.
1 pc.
Condenser
1586 x 686 x 706 1652 x 751 x 795 1777 x 751 x 795
3 pcs.
Defrost system
Drain
3 pcs.
Automatic (drainage)
1 pc.
1 pc.
LED Light Board
2 pcs. 2 pcs.
2 pcs. 2 pcs.
1 pc.
1 pc.
67 80 85
73 89 94
1

1.2 ELECTRICAL PARTS SPECIFICATION
MR-FT35EH-C MR-FT46EH-C MR-FT51EH-C
Running capacitor
Capillary tube
Dehydrant Molecular sieve
Refrigerant R600a
Model
Type
Input
Revolution
Model
Type
Input
Revolution
Dial position ON OFF OPEN SHUT
Warmer
oC
-13.1 -16.1 3.9 2.9
Normal
oC
-18.8 -21.8 2.4 1.4
Colder
oC
-23.6 -26.6 -3.0 -4.0
4(Current limiter)
Running current (A.T. : 30 ºC) A
Heater Defrost heater
Defrosting control
mm.
g
g
Defrosting timer
Defrost finish
Thermal fuse
Current
Motor protector
Model
Ambient temperature
Time
0.78 0.81 0.83
 1.8 X  0.65 X 2350
9
Compressor
Model
Power supply
Rated input W
o
C
Sec.
A
Starting current
Winding resistance (A.T. : 20
o
C)
Control board
Thermister 14 + 1.5
73
A
12.4 W
MM3-71CCY
oC
oC
FBA12J12VXC
DC brushless
1.44 (12V DC)
1450 (12V DC)
25
16 MAX
17.0
4mF 400VAC
81 W (110V 150W) 76 W (110V 160W)
MR-FT35EH-C
MR-FT46EH-C
MR-FT51EH-C
109 108 112
EEI91E13DCH
110V 60Hz
Machine
Chamber
W
r.p.m
W
r.p.m
4.2 (12V DC)
2300 (12V DC)
4715JL04WS16G51
DC brushless
Temperature control
Thermistor R
Freezer Refrigerator
Thermistor F
73 82 85
Fan motor
Freezer
2

Unit : mm
MR-FT35EH-C
2
OUTLINES AND DIMENSIONS
PLUG CORD LENGTH
REQUIRED SPACE FOR INSTALLATION
3

Unit : mm
MR-FT46EH-C
PLUG CORD LENGTH
REQUIRED SPACE FOR INSTALLATION
629
795
4

Unit : mm
MR-FT51EH-C
PLUG CORD LENGTH
REQUIRED SPACE FOR INSTALLATION
629
795
5

MR-FT35EH-C
MR-FT46EH-C (SKELETON WIRING DIAGRAM)
MR-FT51EH-C
3
WIRING DIAGRAM
6

7

MR-FT35EH-C
4
REFRIGERANT CIRCUIT
8

MR-FT46EH-C
MR-FT51EH-C
9

MR-FT35EH-C
MR-FT46EH-C
5
NAME OF PARTS
10

MR-FT51EH-C
11

6.1) TROUBLE CRITERION OF MAIN PARTS
MR-FT35EH-C MR-FT46EH-C MR-FT51EH-C
Measure the resistance with a tester.
(Ambient temperature:Room temperature 15
o
C ~ 25
o
C)
Open
Close
Opened (
 W
)
Measure the resistance with a tester.(Ambient temperature:Room temperature 15
o
C ~ 25
o
C)
Measure the resistance with a tester.(Ambient temperature:Room temperature 15
o
C ~ 25
o
C)
Machine
chamber fan
motor
In the machine
chamber at the
rear side of the
frame.
Less than 1W
Motor
damper for
refrigerator
compartment
In the control
panel
of the refrigerator
compartment.
Normal Abnormal
(faulty)
Winding
(Blue-White,
Red-Yellow)
415 W (Approx.)
Open ( W ) or
short circuit
(0W)
chamber at the
61 + 8
o
C
rear side of
Measure the resistance with a tester.(Ambient temperature:Room
temperature 15
o
C ~ 25
o
C)
the frame
Normal
Abnormal(faulty)
Winding
(Black-White)
(White-Red)
(Red-Black)
12.4 W
(20 ºC)
Opened ( W ) or
short circuit (0W)
Motor
protector
Compressor in
Model
MM3-71CCY
the machine
Connected Point
100 + 5
o
C
Rated current
A
0.84/1.10 (27/37 rps) the frame
Normal
Abnormal
(faulty)
the machine
Rated input
W
35.1/48.7(27/37 rps) chamber at the
Starting current
A
4.0 rear side of
6
TROUBLE SHOOTING
Components
/ Part Name
Check Method and Criterion
Parts Mounted
Position
Compressor
Compressor in
Model
EEI91E13DCH
Model
4715JL04WS16G51
Type
DC brushless
Normal
Abnormal (faulty)
Between 3 - 1 (GND
and Vcc): About 25kW
Between 3-1 : open( 
W ) or
between 2-1 : short ( 0
12

In fan grille of the
freezer compartment.
Measure the resistance with a tester.(Ambient temperature:Room temperature 15
o
C ~ 25
o
C)
In the drip tray under
the evaporator of the
Measure the resistance with a tester.
freezer compartment
(Ambient temperature:Room temperature 15
o
C ~ 25
o
C)
Resistance measured under
Defrost thermistor
the ambient temperature from
(kW)
at the muffler
-50: to +50:
of evaporator
in freezer compartment.
1. 200" to 500k"
............normal
Freezer thermistor at
2. Out of the above range
fan grille of freezer
............abnormal
compartment.
Out air thermistor
under hinge cover
Thermistor Check Procedure
Thermistor resistance will vary
with the change of temperature.
Take the temperature around the thermistor,
and then measure resistance using a tester.
The relation of resistance and temperature is as shown on
the above graph.
Thermistor
MR-FT35EH
MR-FT46EH,FT51EH
331Ω (Approx.)
353Ω (Approx.)
Defrost
Heater
DC brushless
Model
Type
Model refrigerator
Rated input
Operation method
Abnormal (faulty)
Normal
Between 3 - 1 (GND
and Vcc): About 12kW
MR-FT35EH MR-FT46EH,FT51EH
Normal
Refrigerator
fan motor
Check Method and Criterion
Parts Mounted Position
Components/
Part Name
FBA12J12VXC
Between 3-1 : open( ¥ W )
or
between 3-4 : short ( 0 W)
150 W (110V) 160 W (110V)
Power ON after defrosting (14 ± 1.5ºC or more)
Abnormal (faulty)
Opened ( ∞ Ω )
Resistance
-20 20 30 -10 010
30
20
15
10
5
0
25
35
Thermistor resistance valves against
temperature
Temperature
Outside air thermistor
Freezer
thermistor,
Defrost
thermistor
Inner
thermistor
13

6.2 TEST POINT DIAGRAM OF MAIN CONTROL BOARD
14

MR-FT35EH,MR-FT46EH,MR-FT51EH
6.3 LED trouble display and check point.
1) Trouble is indicated by the blinking number of self-check LED(Red color) which locate
at near dial of control panel(The detail picture as shown in right side.)
The blinking number of self-check LED specifies the trouble which has occurred.
LED repeats to blinks as many times as the number specified for each trouble cycle.
Rule for convert error code from LED to numerical data as below :
- For ten's place, LED will light for 0.9s.(Long light period) - Time period while LED off inside its cycle was 0.3 s
- For ones' place, LED will light for 0.3s.(Short light period) - Time period while LED off between each cycle was 3 s
Example of error code 12 as shown in below timeline.
Table shown error code
Tens'
place
Ones'
place
0 2 Compressor turns OFF.
1 1
2. Check the resistance of thermistor.
>Replace.
1 2
2. Check the resistance of thermistor.
>Replace.
1 3
2. Check the resistance of thermistor.
>Replace.
1 8
3 1
>Replace.
3 2
2.Check BOX FAN operation. >Replace.
Trouble of BOX FAN When motor doesn’t rotate even though
power is on
1.Connector CN9S and CN5D
on control board, fan motor 4-pin
wire to wire connector
>Repair the
contact failure.
* 3 minutes later, the fan motor is
reactivated to be checked.
* Until the fan motor gets to operate
correctly, the buzzer sounds every time
the door is closed.
Trouble of freezer fan
motor
When motor doesn’t rotate even though
power is on
1.Connector CN9S and CN5D
on control board, fan motor 4-pin
wire to wire connector
2.Check fan motor operation.
>Repair the
contact failure.
* 3 minutes later, the fan motor is
reactivated to be checked.
* Until the fan motor gets to operate
correctly, the buzzer sounds every time
the door is closed.
Trouble of refrigerator
thermistor
When there is a short or open circuit in
the
F-room thermistor.
1. Connector CN9S on control board,
4-pin wire to wire connector
>Repair the
contact failure.
Synchronize the open/close status of R
damper with that of compressor
Trouble of outside air
thermistor
(NOTE 2)
When there is a short or open circuit in
the outside air thermistor.
>Replace
OPERATION
PCB
Control it by refering to outside temp at
25 ºC.
After compressor off, the compressor
repeats 30-minute ON and 20-minute
OFF
Trouble of defrost
thermistor
When there is a short or open circuit in
the defrost thermistor.
1. Connector CN9S on control board,
4-pin wire to wire connector
>Repair the
contact failure.
The defrost heater won’t be turned ON.
Communication
error of inverter
A commutation error occurs between
refrigerator control circuit and inverter
control circuit in control board. (They
do not transmit and receive data for 10
seconds.)
>Replace the
control board
Trouble of freezer
thermistor
When there is a short or open circuit in
the
refrigerator compartment thermistor.
(NOTE2)
1. Connector CN9S on control
board,
>Repair the
contact failure.
ERROR CODE
Trouble Detecting method Check point How to fix Control
LED self
check
Tens' place Ones' place Tens' place Ones' place
0.9 s 0.3 s 0.3 s 0.3 s 0.3 s 3 s 0.9 s 0.3 s 0.3 s 0.3 s 0.3 s
1 CYCLE 1 CYCLE
LED ON
LED OFF
15

Tens'
place
Ones'
place
3 4
5 0
5 1
5 2
5 3
5 5
5 6
5 7
The setting of Self Mode Check will be displayed and blinks during or Self Mode Check operation.
SHORT or OPEN circuit of thermister.
When the resistance is ∞ Ω, the circuit is deemed open-circuited.
When the resistance is 0 Ω , the circuit is deemed short-circuited.
The error codes E50 to E55are not displayed even if those abnormalities occur when power is turned on.
Therefore, be sure to perform self check mode operation in order to check if any abnormality
indicated by these error codes occurs.
If those errors still continue for 1 minute after the restart, E56 will be displayed again.
(NOTE4)
(NOTE5)
(NOTE1)
(NOTE2)
Inverter drive module
abnormality
The overcurrent error is detected before
starting the compressor (failure of the IC
in the inverter drive module)
>Replace
the control board.
An attempt to restart the compressor is
repeated every 3 minutes
Trouble of control board
(EEPROM related trouble)
(NOTE4)
EEPROM (IC11M)
accumulates data necessary for control.
• The data are not input accurately.
• The microcomputer cannot read the
data.
>Replace the
control board.
If abnormality occurs when power is
turned on, the compressor is stopped
for 10 minutes.
When abnormality occurs during
normal operation, the compressor
keeps operating.
Defective wiring
connecting or trouble of
control board
The errors E50 to E53 keep occurring
over one and a half hour. (The situation,
which compressor cannot be operated,
continues.)
• The error display starts after
the error is determined as E56.
• The error display continues
until defrosting starts or cooling
operation gets back to normal. (The
error display does not disappear by
unplugging and plugging the power
cord.)
(Note5)
• An attempt to restart the compressor
is repeated every 3 minutes.
Trouble of bus-bar voltage
• The range of bus-bar voltage is not
approx. 50 ~ 340 VDC
Trouble of inverter
software reset function
• The inverter driving software
malfunctions.
Trouble of startup,
synchronization or
overcurrent detection
(NOTE4)
• There is no current at compressor
startup.
• The phase current exceeds 5.5 A at
compressor startup.
• The phase current exceeds 3.3 A
during compressor operation.
•A current of 5.3 A or more runs into the
bus-bar of control board.
The compressor is stopped and
reactivated 10 minutes later
Refer to “Compressor does not operate” topic
Refer to “Compressor does not operate” topic
Clogging of refrigerant
pipe or trouble relatedto
compressor.
(T0: Defrost thermistor temperature at
power input, T1: Defrost thermistor
temperature when 15 minutes have
passed from the power input)
• When the difference between T0 and
T1 is T0 ≦ T1
Check the compressor and the pipe. When cooling operation returns to
normal condition, the display of error
code disappears.
Trouble of inverter circuit
(NOTE4)
• There is any trouble in the circuit
which detects current of compressor
>Replace the
control board.
ERROR CODE
Trouble Detecting method Check point How to fix Control
16

6.4 Importance detail of fault analysis
6.4.1 Flow chart of self - check
1) Self - check monitor circuit
For show the fault condition of refrigerator and clarify point. Therefore, self - check monitor control is provided
that are able to monitor No. of blinking condition with electric circuit and electric part . Before disconnect power plug please
confirm LED self - check .
Caution
1. As the part list below couldn't analysis by self - check , then
please check by reference to trouble shooting page.
- Dilapidation of door switch ,refrigerator room and freezer room.
- Dilapidation of compressor and fan motor .
2. If have malfunction when supply the power . Compressor and
fan motor will not operate 20 minutes.
2) Interval of self check analysis
- Troubles of thermistor : will check always.
- Trouble of defrost heater : will just analyse during defrost display only.
(The period checking will analyse the defrost circuit after connect the plug 2 hours )
Refrigerator plug
connect?
Connect power plug
Self - check
Mal Function Display
(No .of blinking) No change on display Normal operation
Check the fault point as
malfunction list
Disconnect power plug
Repair the macfunction cause
Connect power plug
No
Yes
Yes
No
17

6.4.2 LED for deodorition and bacteria eradication display
Install part point
Normal Use tester's diode range with swing meter during (-)-1 (+) of 2 PM connector by asking use
tester which have diode range ( )
Timing connect power After compressor off 3 min. , after the defrost heater off 8 min during open the door ( max 5 min.)
Malfunction
LED will shine the violet
light with in timing hole
above.( right picture )
Use tester's diode range with swing meter during 2 (-)-1 (+) , and for make sure which change
poles and observe must be not swing of short resistance ( 0W )
LED
18

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