Daewoo FR-551NB User manual

S/M No. : FR521NT010
Service Manual
Refrigerator
Nov. 1999
DAEWOO ELECTRONICS CO., LTD
http : //svc.dwe.co.kr
Model :
FR-521NT/551NT
FR-521NB/551NB

1
TABLE OF CONTENTS
EXTERNAL VIEWS .......................................................................................................................... 2
1. EXTERNAL SIZE .......................................................................................................................... 2
2. NAME OF PARTS ........................................................................................................................ 3
SPECIFICATIONS ............................................................................................................................ 4
1. OUTLINE ...................................................................................................................................... 4
2. ELECTRIC PARTS ....................................................................................................................... 4
3. POWER CORD ............................................................................................................................ 8
4. DOOR COLOR ............................................................................................................................. 9
OPERATION AND FUNCTIONS .............................................................................................. 10
DIAGRAM ......................................................................................................................................... 15
1. WIRING DIAGRAM ...................................................................................................................... 15
2. CIRCUIT WIRING DIAGRAM ....................................................................................................... 16
3. AIR FLOW DIAGRAM .................................................................................................................. 17
4. REFRIGRANT CYCLE DIAGRAM ............................................................................................... 18
DISASSEMBLY AND ASSEMBLY .................................................................................................. 19
EXPLODED VIEW AND PARTS LIST.............................................................................................. 31
1. TOTAL EXPLODED VIEW............................................................................................................ 31
2. TOTAL PARTS LIST..................................................................................................................... 32
3. MACHINE ROOM EXPLODED VIEW AND PARTS LIST............................................................. 36
1) For starters, be sure to check any chances of the leakage of electricity.
2) You could handle a part in the vicinity of electricity after unplugging.
3) You should put on rubber glovers to prevent an electric shock on operation test.
4) Make sure the rated current, voltage, capacity before using an instrument.
5) Keep your wet hands away from the metal goods in the freezer compartment not to be frostbitten.
6) Be careful not to let water to permeate the electric part in the machine room.
7) With the door open during your working, you might be damaged by that door.
8) You should give a title to the refrigerator for your safe after removing the breakable goods inside the refrigerator.
9) You'd better use cotton gloves if you fix it up around the evaporator.
SAFETY AND PRECAUTIONS

2
EXTERNAL VIEWS
1. EXTERNAL SIZE
FR-521NT/NB
FR-551NT/NB
19
757
750
20
590
114
24
702
24
1038 60 518 24
597
20.5
93 1088.5
1788.5
10
15
750
126
11
53
3.5
53
757
750
590
19 20
702
24 24
978
114 60 24
518
597
20.5
93 1028.5
1728.5
10
15
53
3.5
750
11
126
53

3
2. NAME OF PARTS
17
18
Freezer Compartment Lamp
Shell Freezer & Icr Tray
Case Icing
Temperature Controller
( Freezer Compartment )
Refrigerator Compartment Lamp
Fresh Case
Shell Refrigerator
Cover Vegetable
Case Vegetable
Front Grille
Adjustable Foot
Freezer Pocket
Egg Pocket
Egg Tray
Bottle Pocket
Multi Pocket
Multi Pocket
16
1
2
3
4
5
15
7
8
9
10
11
12
13
14
EXTERNAL VIEWS

4
SPECIFICATIONS
1. OUTLINE
2. ELECTRIC PARTS
1) COMPRESSOR
DIVISION CONTENTS
MODEL NAME FR-521NT FR-551NT
USABLE CAPACITY FREEZER 125 125
REFRIGERATOR 319 355
TOTAL 444 480
EXTERNAL DIMENSION WIDTH 757mm 757mm
DEPTH 750mm 750mm
HEIGHT 1749mm 1809mm
REFRIGENT R12 160g 160g
R134a 130g 130g
COOLING & CONTROL SYSTEM COOLING SYSTEM Fan Cooling System
DEFROST SYSTEM Fin Evaporator Forced
DEFORST CONTROL Automatic Start & Stop
NET WEIGHT 71kg 72kg
REFRIGEANT R12
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
COMP MODEL X X X X SL28YE-5 PL23YH-4 SL28YE-5 SL28YE-5
PART CODE X X X X 3954128A50 3956123P40 3954128A50 3954128A50
STARING TYPE X X X X RSIR RSCR RSIR RSIR
REFRIGEANT R134a
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
COMP MODEL XHBL25YG-3 X X HPL26YH-5 XHPL26YH-5
PART CODE X3952125R30 X X 3956126S50 X3956126S50
STARING TYPE XCSR X X RSCR XRSCR

5
2) RELAY
3) STARTING CAPACITOR
4) RUNNING CAPACITOR
REFRIGEANT R12
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
ASSY TYPENAME X X X X 276THBYY-52 181SHBYY-52 276THBYY-52
PART CODE X X X X
3018119940 3018116610 3018119940
PTC RESIANCE X X X X 33 22
PART CODE X X X X
OVER LOAD OVER LOAD X X X X
REFRIGERANT R134a
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
ASSY TYPE NAME X 783NHBZZ-52 X X 197NHBYY-52 X197NHBYY-52
PART CODE X3018119390 X X3018119920 X3018119920
PTC RESISTANCE XS220 X X S330 XS330
PART CODE X X X X X
OVER LOAD PART CODE X783NHB X X 197NHB X197NHB
REFRIGERANT R12
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
PART CODE X X X X X X X X
RATED VOLTAE X X X X X X X X
RATED CAPACITANCE X X X X X X X X
REFRIGERANT R134a
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
PART CODE X3016400100 X X X X X X
RATED VOLTAE X100V X X X X X X
RATED CAPACITANCE X100 X X X X X X
REFRIGERANT R12
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
PART CODE X X X X X 400EL15110 X X
RATED VOLTAE X X X X X 350V X X
RATED CAPACITANCE X X X X X 5X X
SPECIFICATIONS

6
5) F-FAN MOTER
6) C-FAN MOTER
7) DEFROST HEATER
8) LAMP ASSEMBLY
9) PCB TRANSFORMER
REFRIGERANT R134a
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
PART CODE X3816800400 X X 3016401900 X 3016401900
RATED VOLTAE X300V X X 400V X400V
RATED CAPACITANCE X7X X 4X4
REFRIGERANT R12,R134a
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
TYPE NAME DL-2213DWFC
PART CODE 3015907200
REVOLUTION 2200RPM
REFRIGERANT R12,R134a
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
TYPE NAME DL-2213DWCB
PART CODE 3015907300
REVOLUTION 2200RPM
REFRIGERANT R12,R134a
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
SPEC(W) X 148W
PART CODE X3012805500
REFRIGERANT R12,R134a
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
SPEC(W) X15W
PART CODE X301360010 3013600080
COLOR
REFRIGERANT R12,R134a
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
TYPE NAME XFRB-5070NT
PART CODE X5EPK057860 5EPK057004
SPECIFICATIONS

7
SPECIFICATIONS
10) MAIN PCB ASSEMBLY
11) DRYER
12) FUSE (PCB)
13) THERMO FUSE
14) DOOR S/W
15) R-SENSER
REFRIGERANT R12,R134a
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
TYPE NAME X N808RT
PART CODE X3014385070 3014385060
REFRIGERANT R12 R134a
SPEC (g) 10g 15g
PART CODE 3016801000 3016801010
REFRIGERANT R12,R134a
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
RATED CURRENT X250V/1.6A
PART CODE X5F3GB1682R
REFRIGERANT R12,R134a
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
OPERATING TEMPERATURE X
77
PART CODE X3017200500
REFRIGERANT R12,R134a
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
PART CODE 3018100010
REFRIGERANT R12,R134a
VOLTAGE(V/HZ) 100/50,60 110/60 115,120/60 127/60 220/50 220/60 230/50 240/50
PART CODE 301482300
C

8
3. POWER CORD
Upper power cord’s part code is only for lead wire, without any kinds of terminal or housing
NO SHAPE OF CODE PART CODE DESCRIPTION REMARK
13011315000 CP-2PIN FOR EUROPEAN COUNTRY
2401RA17200 CP-2PIN FOR OTHER COUNTRY
34006D17101 KP-30 FOR AMERICA & ELSALVADOR
4401PD17101 KP-211 FOR JAPAN & TAIWAN
53011300801 BP-3PIN
63011303010 #267 FOR CHILE
73011315310 FOR ISRAEL
8
3011303050 BS-1363A FOR U.K, MIDDLE ASIA
SINGAPORE & MALAYSIA
93011301200 KP551/550 FOR CHINA & AUSTRALIA
SPECIFICATIONS

9
4. DOOR COLOR
1) ASSEMBLY URETHAN FREEZER DOOR
2) ASSEMBLY URENTHAN REFRIGERATOR DOOR
FR-521NT
NON-KEY TYPE
KEY TYPE
FR-551NT
NON-KEY TYPE
KEY TYPE
REFRIGERANT R12 R134a
COLOR TYPE
Dull
lamina sheet High-glossy Lamina sheet Normal PCM High-glossy Bright PCM Dull lamina sheet High-glossy Lamina sheet Normal PCM High-glossy Bright PCM
PART CODE X3010075150 X X X 3010075170 X X
REFRIGERANT R12 R134a
COLOR TYPE
Dull
lamina sheet High-glossy Lamina sheet Normal PCM High-glossy Bright PCM Dull lamina sheet High-glossy Lamina sheet Normal PCM High-glossy Bright PCM
PART CODE X3010079100 X X X 3010079140 X X
REFRIGERANT R12 R134a
COLOR TYPE
Dull
lamina sheet High-glossy Lamina sheet Normal PCM High-glossy Bright PCM Dull lamina sheet High-glossy Lamina sheet Normal PCM High-glossy Bright PCM
PART CODE X3010079150 X X X 3010079160 X X
REFRIGERANT R12 R134a
COLOR TYPE
Dull
lamina sheet High-glossy Lamina sheet Normal PCM High-glossy Bright PCM Dull lamina sheet High-glossy Lamina sheet Normal PCM High-glossy Bright PCM
PART CODE X3010079110 X X X 3010079130 X X
REFRIGERANT R12 R134a
COLOR TYPE
Dull
lamina sheet High-glossy Lamina sheet Normal PCM High-glossy Bright PCM Dull lamina sheet High-glossy Lamina sheet Normal PCM High-glossy Bright PCM
PART CODE X3010079170 X X X 3010079180 X X
SPECIFICATIONS

10
NO CONTROL
FUNCTION INPUT CONTROL OBJECTS CONTENTS REMARK
1Display F-PCB
Button :TEMP
CONTROL But-
ton
Custom LED
1. Normal State
Initial State ; Both compartments’ Icons indicate Middle-mode
(“ 1” , and “ 2” are lit.)
2. TEMP CONTROL Button
Temperature Regulation of Freshfood Compartment
Middle-right Icons are lit by pressing the button.
(1) 2 3 In winter
3. Temperature Regulation of Freezer Compartment
Temperature is regulation by moving the lever to the left and / or the
right.
Temperature has nothing to do with PCB control.
2Temperature
Regulation of
Freezer
Compartment
1.TEMP Conrol
Button
2. R-Sensor
3. RT-Sensor
COMP F-FAN 1. Temperature regulation by TEMP Control Button.
(1) 2 3 In winter
2. R-Fan is controlled by On/Off-point of each mode.
3. On/Off DIFF : 1.0
( Middle (“ 1” ) OFF-point : 4.0 )
4. Step Difference of Fresh Food Compartment.
* 1 2 : 1.0
* 2 3 :1.0
* 3 IN WINTER : 1.0
Reference
- ON/OFF Diff :
Fixed at
Micom
- STEP Diff :
Fixed at
Micom
Comp and
C-fan are
Coworking
OPERATION AND FUNCTIONS

11
3Defrosting
Period 1. Total Run-time of COMP
2.Running-rate of
COMP
3. Total time of
Door openings
4. RT-
Temperature
Defrosting
Mode
1. What to be considered in determing Defrosting Period
1) Total Run-time of COMP : 6, 8, 10, 12, 14 hours
2) Running-rate of COMP (each 2hours’ running-rate) :
more than 80%
3) Total time of Door openings : 10 minutes
4) Total Time (COMP-On + COMP Off ) : 60 hours
5) Ambient Temperature : more than 35
6) In each Error : R1, F1, D1, F3, RT-S, Door-SW Error
2. Terms to start Defrosting Period
1) The Defrosting starts with the following conditions, in
case total COMP-run time passes 6, 8, 10 or 12hours
- when an Error occurs
- when running-rate of COMP is more than 80%
- when total Door-opening time is more than 10minutes
- when the ambient temperature is more than 35
2) Defrosting starts unconditionally when total COMP-
run time passes 14 hours, under the condition taht
terms of 1) are not satisfied.
3) Defrosting starts immediately when Total-time
(COMP-On + Off time) is more than 60 hours, under
the condition that terms of 1) and/or 2) are not satis
fied.
4Defrosting
Mode Defrosting Period 1. COMP 2. R-FAN
3. HEATER
1.Defrosting Mode
1) Time : 25minutes
2) COMP and R-Fan are On, and HTR is off
3) Pre-cool turns off when R-Sensor 2.5
1) Heater turns off when D-Sensor 10
2) Limit time : 80minutes
3) Heater continues to be On for 40 minutes of limit time
when D-Sensor is in Error
4) Limit time
30seconds : Heater continues to be On after
Defrosting regardless of D-Sensor temperature.
40minutes : in case of D1-Error
80minutes : in normal control state
1) Time : 4minutes
2) COMP and R-Fan are Off.
1) Time : 5minutes
2) Only COMP is On, While R-Fan is Off.
2. Output Control and Limit Time of each Defrosting Mode
C-Fan and
COMP are co-
working.
NO CONTROL
FUNCTION INPUT CONTROL OBJECTS CONTENTS REMARK
Pre-Cool
Pause
Fan Delay
Heater
Defrosting
Pre-Cool Heater Defrosting Pause Fan Delay
COMP ON OFF OFF ON
F-FAN ON OFF OFF OFF
R-FAN CONTROL OFF OFF OFF
HETER OFF ON OFF OFF
Limit Time 50MINUTES (1) 80 MINUTES
(2) 40 MINUTES
in case of D-Sensor Error
4MINUTES 5MINUTES
OPERATION AND FUNCTIONS

12
5Error Display
(Displayed on
C-LED of F-
PCB)
1. TEMP
Control Button
2. Refrigerorator
(Freshfood
Compartent)
Door
CUSTOM-LED 1.How to start ; open and close refrigerator door 3 times while pressing
REF.SET Button and it starts after 3 seconds.
2. Display
- If any error, characters(Bar-LED) of C-LED are lit.
- In Error Display Mode, the Buzzer beeps in short interval-every
0.1 second at 5 seconds’ cycle.
3. How to finish : doing above 1 again.
4. It ends by itself 4minutes after start.
5. All the Error Code is reset by itself when it returns to normal state.
6. Error Code
7. Error Control
1) r1 Error
Occurrence : in case of R-Sensor disconnection / short-circuit.
Control it in accordance as ambient temperature.
Dissolution : if R-Sensor is in normal state, it is finished by itself.
2) rt Error
Occurence : RT-Sensor disconnection/short-circuit
Control : deletion of control-condition by RT-Sensor
Dissolution : If RT-Sensor is in normal state, it is finished by itself.
3) d1 Error
Occurrence : D-Sensor disconnection/short-circuit
Control : by limit time(40min.) of Defrosting-return
Dissolution : it D-Sensor is in normal state, it is finished by itself.
NO CONTROL
FUNCTION INPUT CONTROL OBJECTS CONTENTS REMARK
Error Code C-LED CONTENTS Running State
r1 “ 2” of Left R-S
disconnedtion/short-
circuit
Running by 20min.’ s
period according to
RT
d1 “ in win-
ter” of Left D-S disconnection/short-
circuit
Heater is On for
40min. during
Defrosing.
rt
“ 3” of Left RT-S
disconnection/short-
circuit
Deletion by RT-Sen-
sor
door “ 1” of
Right. Defective Door S/ W(when S/W senses
that door opened
more than 1 hours)
Deletion of sensing
Door-S/W
C1 “ 2” of Ref. Abnormal
Cycle(COMP runs
more than 3 hours at
D-3 -5
Normal Running
F3 “ 3” of Right. In case of Heater
Defrosting, when it
returns to
Time(80min.), not D-
Sensor
Normal Running
(Deletion of Pre-cool
Mode in Defrosting
Mode)
RT/S In Error ~13 14~19 20~29 29
Running-rate
(ON/OFF) 16/24 6/34 14/26 16/24 20/20
OPERATION AND FUNCTIONS

13
4) Door Error
Occurrence : when door-opening is sensed for
more than 1 hours
Control : deletion of Door SW sensing function
Dissolution : it Door SW open-close is sensed, it ends by itself.
Display dissolution : after Custom LED Display Mode
(Door SW should be in normal state if Error Display Mode is to
start.)
5) C1 Error
Occurrence : when COMP runs continuously for more than 3 hours
while D-Sensor is above -5
Control : normal running
Dissolution : when D-Sensor temperature is below -5 while
Comp is Off
5) F3 Error
Occurrence : by limit time of 80min. at defrosing ruturn
Control : deletion of Pre-cool mode at defrosting mode
Dissolution : the end of defrosting is done by D-Sensor
6Forced Defrost-
ing 1. Defrosting Key Defrosting Mode * A/S(Heater)Forced Defrosting 1. Start : The defrosting begins by pressing defrosting key
5 times ( It is impossible in the state of Energy Con sumption Forced
Defrosting. )
2. Process
1) Let Heater On for 30 seconds.
2) Delete Pre-cool of normal defrosting mode.
HTR Defrosting Pause Fan Delay Normal Running
3. Heater turns Off when D-Sensor temperature is more
than 10 , 30seconds after Heater On.
7Time Delay of
Electric Devices 1. Door Switch 2. COMP On/Off R-FAN 1. F-Fan Time Delay in COMP On/Off
Fan turs On/Off 1 minute after COMP On/Off
2. F-Fan/R-Fan Time Delay by Door Switch
Line check on : After 2 hours of initial run, the function of easy
door-opening starts.
NO CONTROL
FUNCTION INPUT CONTROL OBJECTS CONTENTS REMARK
OPERATION AND FUNCTIONS
COMP
FFAN

14
8Initial
Defrosting 1. D-Sensor 2. Initial Power
Supply
Defrosting
Mode 1. Defrosting mode starts when D-Sensor 3.5 at initial power supply.
( It starts from Pre-cool ) COMPdelay for
6min at initial
defrosting
9Explanation
after Delivery 1. TEMP Control Button
2. Power Cord
Electric Devices 1. Start : Press both buttons for 3 seconds after initial power supply
( plug-in ).
2. Electric devices turn Off for 3 hours.
3. Display works in normal way.
10 Prevention of
COMP Restart COMP 1. COMP does not restart after COMP Off, though F-Sensor turn On. 6 min.delay
11 Buzzer Alarm 1. Button on F-
PCB
2. Door Switch
Buzzer 1. Buzzer rings by perssing F-PCB Buttons.
2. Buzzer rings for 1 second after initial power
suppluy(plug-in)
3. Buzzer rings for 1 second at the start of A/S Forced
Defrosting.
4. Buzzer rings every 1 minute after door opening.
( It rings within 5 minutes and ring-time is prolonged as
time passes)
5. Buzzer makes short ring every 5 seconds in Error
Display.
12 Demonstration
Function 1. Door Switch 2. TEMP Control
Button
Electric Devices 1. Start : open and close Refrigerator [ Freshfood
Compartment ] Door 5 times while pressing TEMP
Control Button.
2. Control
1) Electric devices turn Off except for R-Fan.
2) Fan Control
3. Dissolution :
1) Open and close Refrigerator [ Freshfood
Compartment ] Door 5 times while pressing REF.SET
Button in Demonstration mode.
2) Supply the power again ( plug-out and plug-in )
6 minutes delay
13 Control of R-
Sensor Off-
Point
1. Slide
SW(SW1) on
M-PCB
Control Resis-
tance of R-Sen-
sor “ 2” Off-Point
1. In case of Weak-refrigeration ( though R-Fan and Comp
work on and on ), the following actions are to be done.
2. Resistance R13 : Control Resistance of R-Sensor
Middle (“ 2” ) Off-point ( 4.0 , 31.4 )
3. Resistance R14 : reduceing R-Sensor Resistance by
1.5 in case of weak-Refrigeration ( 2.5 , 2.15 )
4. SW1 : during A/S, if SW1 is opened, R-Sensor Middle Off-
point decreases by 1.5 .
5. Switch Status and R-Sensor Middle Off-point
NO CONTROL
FUNCTION INPUT CONTROL OBJECTS CONTENTS REMARK
Door Open Door Close
R-FAN ON OFF
Switch Status R-Sensor Middle Off-Point
Normal/Using Jig 4.0
In Weak-refrigeration 2.5
OPERATION AND FUNCTIONS

15
1. WIRING DIAGRAM
8 PIN
F-MOTOR C-MOTOR
RED
GREEN
RED
BLUE
D-
SENSOR
R-HTR
R1-SENSOR
BLUEx2
COMPRESSOR
RED
BROWN
DR-S/W
GRAY
OR
OR
ORANGE
GN/YW
YELLOW
YELLOW
BLACK
BLACK
BLACK
BLACK
L/BLUE
BLACK
DEFROST
HEATER
W
HITE
GRA Y
WHITE
YELLOW
BLACK
YELLOW
OR
WHITE
BROWN
WHITE WHITE
PLUG
COMP
ACINPUT
COMM
D-HTR
TEMP
FUSE
GRAYx2
WHITEx2
BLUE
BLUE
GRE E N
G RE E N
WHITE
DIAGRAM

16
DIAGRAM
2. CIRCUIT WIRING DIAGRAM

17
DIAGRAM
3.AIR FLOW DIAGRAM

18
4. REFRIGRANT CYCLE DIAGRAM
C
O
M
P
R
E
S
S
O
R
W
I
-
C
O
N
H
O
T
P
I
P
E
D
R
Y
E
R
C
A
P
I
L
L
A
R
Y
T
U
B
E
E
V
A
P
O
R
A
T
O
R
A
C
C
U
M
U
L
A
T
O
R
S
U
C
P
I
P
E
DIAGRAM

19
DIASSEMBLY AND ASSEMBLY
1) FREEZER & REFRIGEATOR DOORS
Insert flat type (-) screw driver between Hinge
cover and Cabinet surface to remove the Cover
( Be careful not to break the hooks of Cover and
not to damage the Cabinet surface. )
Remove 4 bolts with 10mm wrench.
Disconnect Connector Housing.
Lift F-Door a little to remove it.
Unfasten Hinge Pin with 6mm wrench.
Lift R-Door up a little to remove it.