Samsung SG626, SG628, BG626, BG678, SG676 Reference Information

Reference

Reference1

Reference2

NO

C

NC

Coil bisection

The connection of DOOR-CABI

BLK

1
2

BRN

3

MAIN

PCB

RED

4

ORG

5

YEL

6

PNK

7

BLU

8

PUR

9 9 9

GRY

10

WHT

11

S/BLU

CON7

Inspection of Relay

Coil bisection

Measure after
separation

(Relay Movement)

CON9

CON10
MAIN PCB

CON8

10
11
12

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

10
11
12

10
11

1
2
3
4
5
6
7
8
9

BLK
BRN
RED
ORG
YEL
PNK
BLU
PUR
GRY
WHT
S/BLU

PANEL

PCB

* First separate the housing connected to the

main PCB CON C8, 09, 10 and measure the
following items.

1. M e a s u re the coil bisection of the relay and
check whether it works.

2. Measure the apex bisection for open circuit.

Apex category The voltage of

coil bisection

DC 12V(Operation)

Apex 3

DC 05V(Standstill)

Apex 2

DC 12V(Operation)
DC 0V(Standstill)

Judging the apex

bisection

C:NO SHORT
C:NC OPEN
C:NO OPEN
C:NC SHORT
SHORT
OPEN

Note) C →Common, NO → Normal open, NC → Normal close

3. When it operates as above, it is normal and
when it does not operate, report the
corresponding relay.

36 Samsung Electronics

Reference3

Short

Check for malfunctioning of the subordinate

Measure after separation

* Cut off the power code, separate the housing

from the main PCB CON 08, 09, 10 and
measure the following.

CON9

R-Defrost heater

SWINT MOTOR

R-C/FAN

RED

Note) The compressor is impossible to measure resistance by the

running and starting condenser.

Reference4

R-Lamp
F-Lamp

F-C/FAN

COMP.

Inspection of the sensor

R2 ROOM

R1 ROOM

F - ROOM

R / DEF - SONSOR

F / DEF - SONSOR

RED

8
7

5
3

1

CON10

9
7

5

4
3
2
1

CON3

1
2
3
4
5
6

Measure after separation

CON2

4
3
2
1

MAIN PCB

1
2
3

CON3

4
5
6

CON9

CON10

1. Measure resistance between the terminals and
check for malfunctioning of L/W.

Subordinate

R Defrost heater
F Defrost heater
Comp
Swing motor
R-Circulation fan
F-Circulation fan
R-Lamp
F-Lamp

M e a s u r e m e n t

t e r m i n a l

CON9 ⑨& CON10
CON8 ③& CON10
CON8 ⑤& CON10
CON8 ①& CON9
CON8 ①& CON9
CON8 ①& CON10
CON8 ①& CON9
CON8 ①& CON10

Evaluation of mea-

surement result

③

0Ω or ∞Ω(defect)

③

Impossible to measure 0Ω indicator

⑤

0Ω or ∞Ω(defect)

⑤
③
⑦
①

⑨

* Separate the housing connected to main PCB

CON2 and CON3.

* Resistance value lowers while temperature

rises, because it is a NTC type sensor.

1. R1 sensor measures resistance of CON2
between ①~②.

2. R2 sensor measures resistance of CON2
between ③~④.

3. Freezer sensor measures resistance of CON3
between ①~②.

4. R-defrost sensor measures resistance of CON3 between ③~④.

5. F-defrost sensor measures resistance CON3 between ⑤~⑥.

6. The measurement value above is calculated by comparing th e present temperature of the sensor and
the temperecture table in specification found in the manual.

Samsung Electronics 37

Reference5

Checking the Door S/W

(Refrigerator Bulb)

1. Open the door and check if the freezer bulb

F - Door S/W

1

1
22

CON6

MAIN

PCB

DC 12V

turns on.

2. Press the Door S/W and check if the freezer
bulb turns off.

3. Close the door of freezer and repeat 1 and 2 for
refrigerator.

3

R - Door S/W

3

4. If there is a problem, check bulb and door S/W.

5. Check wire connection.

(Micom signal)

1. Check if CON6 ① and ③is 0V DC after closing the F·R doors.

2. Check if CON6 ①is 12V DC when opening F door.

2. Check if CON6 ③is 12V DC when opening R door.

3. If there is problem, check door S/W and wire connection.

Reference6

Forced starting & forced defrosting

TEST S/W

(Forced starting)

* This function is used to turn on the comp and

fan immediately regardless of the temperature
of freezer.

1. Press the button on the PCB after removing the
main PCB cover from the upper part of
refrigerator.

2.

Buzzer will sound to indicate the forced starting.

(Forced defrosting)

* This function is used to turn on the defrosting

regardless of defrost time.

1. Press the button twice during forced starting.
Then, defrosting is performed.

2. If the button is press 3 times during R­defrosting, F-defrosting is also performed at
the same time.

3. If the button is pressed 4 times during R-f
defrosting, test mode is released.

38 Samsung Electronics

Reference7

Sensor Short : Micom 0V.
Sensor Open : Micom 5V.

Sensor resistance and voltage conversion table for temperature

(Sensor pressure voltage 10KΩ – Voltage converted by the F-reference)

* Voltage conversion table depends on H/W structure of MICOM port input voltage.

✽ Sensor partial pressure resistance 10KΩ

TEMP.

– 35
– 34
– 33
– 32
– 31
– 30
– 29
– 28
– 27
– 26
– 25
– 24
– 23
– 22
– 21
– 20

Resistance KΩ ± 1%

68.648

65.011

61.595

58.384

55.366

52.526

49.854

47.337

44.967

42.733

40.626

38.640

36.765

34.995

33.323

31.743

Voltage(V)

4.364

4.333

4.301

4.268

4.235

4.2

4.164

4.127

4.09

4.051

4.012

3.972

3.93

3.888

3.845

3.802

TEMP.

– 13
– 12
– 11
– 10

– 9
– 8
– 7
– 6
– 5
– 4
– 3
– 2
– 1

0
1
2

Resistance KΩ ± 1%

22.832

21.814

20.848

19.932

19.062

18.237

17.453

16.709

16.001

15.328

14.688

14.080

14.501

12.949

12.424

11.924

Voltage(V)

3.477

3.428

3.379

3.329

3.279

3.229

3.178

3.127

3.076

3.025

2.974

2.923

2.872

2.821

2.77

2.719

TEMP.

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

Resistance KΩ ± 1%

9.016

8.673

8.345

8.032

7.732

7.446

7.172

6.910

6.659

6.420

6.190

5.970

5.759

5.557

5.363

5.178

Voltage(V)

2.37

2.322

2.274

2.227

2.18

2.134

2.088

2.043

1.998

1.954

1.911

1.869

1.786

1.786

1.745

1.705
– 19
– 18
– 17
– 16
– 15
– 14

30.250

28.838

27.502

26.237

25.040

23.906

3.757

3.712

3.666

3.62

3.573

3.525

3
4
5
6
7
8

11.447

10.993

10.559

10.146

9.752

9.375

2.668

2.618

2.567

2.518

2.468

2.419

25
26
27
28
29
30

5.000

4.829

4.665

4.508

4.357

4.212

1.666

1.628

1.59

1.553

1.517

1.481

Samsung Electronics 39