42
280~340V DC
Compulsory
defrosting by
short circuit
CN7M
15 16 17
14
13
12
11
10
9
CN9S
18
8
7
6
5
4
3
2
1
CN10K
3
4
5
6
7
1
2
8
CN4D
1 Rotational heater board
3 Water pipe heater
5 Vegetable compartment heater
7 Defrost heater 2 (for evaporator pipe)
9 Defrost heater 1 (for Glass tube heater)
CN2A
+5V DC
(Inverter circuit)
Compressor
1 U phase
3 V phase
5 W phase
CN50G
1
3
5
7
110V AC
Ice tray heater
Tank heater
CN1A
2
1
16
15
14
13
12
11
10
9
8
7
6
5
4
3
CN5D
+12~20V DC
(Inverter circuit)
+5V DC
(Refrigerator
control board)
+12V~14V DC
(Refrigerator
control circuit)
13.5 V com
Box fan (Speed control)
Box fan FG signal
GND
GND
13.5 V com
Refrigerator fan motor FG signal
Fan motor (+)
Reception of operation panel data
T
ransmission of operation panel data
Ice maker (reverse)
Ice maker (rotation)
W
a
ter pump (+)
Ice maker position switch
W
a
ter pump (-)
GND
I-see sensor motor
HIKARI (optical) air deodrization LED +
Supercool freezing LED
7.4V
V
e
getable compartment LED
Door switch input for freezer compartment
Door switch input for refrigerator compartment / ice making compartment
Thermopile (Object)
Thermopile (Thermistor)
Freezer compartment thermistor
Ice making compartment thermistor
V
e
getable compartment thermistor
V
e
rsa compartment thermistor
Defrost thermistor
Ice making tray thermistor
Refrigerator compartment thermistor
GND
5V com
Damper for vegetable compartment/
versa compartment
Damper for ice making compartment/
refrigerator compartment
Interior LED (left)
Interior LED (right)
LED for bacteria removal from water tank
Power supply
of three-way
valve
13
12
14
11
10
9
8
7
6
5
4
3
2
1
The capacitor that is used for the inverter is charged to 330V DC,
so electric charge remains for a while even after power off.
Therefore, an electric shock may occur if the charging portion is
touched by hand.
Short-circuiting between J91C and J92 for 20 seconds or longer
with a tool such as a flat-blade screwdriver allows the capacitor to
discharge safely. When replacement of the control board follows,
be sure to perform this operation.
After discharge, measure between the C91C ter and –
with a tester. Before inspection, be sure to check that the voltage
is 10V DC or lower.
CN61L
2
1
MR-E55R-C
MR-E60R-C
5-7 TEST POINT DIAGRAM OF FILTER BOARD
110V AC
3
1
CN1
MR-E55R-C
MR-E60R-C
5-8 TEST POINT DIAGRAM OF CONTROL BOARD
