Daewoo Frs U20 Service Manual

10
DC13V / 1100±100rpm Condenser
Fan MotorDC13V / 1950
±100rpm R-Fan MotorDC13V / 2050
±100rpm F-Fan Motor E
L
E
C
T
R
I
C
A
L
P
A
R
T
SDispenser Model Specification ( 220~240V Models only ) Item
Basic Model Model Name
AC250V , 10A , 77℃ Fuse Temp (Defrost)PBN-38 F-Sensor D-Sensor D
E
F
O
R
E
S
T
AC220V / 5W - Water Pipe HeaterAC220V / 5W - Dispenser HeaterAC220V / 8W Louver Heater H
E
A
T
E
R
SP201R-7DL / SP201R-7DR
(SPF101B-2D / SPF101B-1D)AC230~240V / 25W (2EA) AC230~240V / 25W (2EA)
R-Lamp
Door...

11
4-1. Display
5 43 2 1 Temp indicationMax Medium
Max 
Mid Medium
Min Min Temperature Chang
5 43 2 1 Temp indicationMax Medium
Max 
Mid Medium
Min Min Temperature Change
1. “FRZ.TEMP” Button
1) Temperature control of Freezer compartment
2) 5 step mode of successive temperature mode.
3) Initial mode by power input : “3”
※Whenever pressing button, setting is repeated in the order of 
Medium(3) →Medium Max(4) →Max(5) →Min(1) →Medium Min(2).
2. “REF.TEMP” button.
1) Temperature control of Refrigerator...

12
1. Display control
2. “FREEZER SET” Button
1) Temperature control of freezer compartment
2) 7 step mode of successive temperature mode.
3) Initial mode by power input : “Medium(-19℃)”
※Whenever pressing button, setting is repeated in the order of 
Medium (-19℃) →Medium Max 1 (-20℃) →Medium Max 2 (-21℃)→Max (-22℃)
→Min (-16℃) →Medium Min 2 (-17℃) →Medium Min 2 (-18℃).
INPUTCONTROL OBJECT
CONTENTS REMARKS  Front PCB button
FREEZER SET, REFRIGERATOR SET
SUPER FREEZER, SUPER REFRIGERATOR
RESET FILTER,...

13
CONTENTS REMARKS 
4. “REFRIGERATOR SET” button.
1) Temperature control of Refrigerator compartment
2) 5 step mode of successive temperature mode.
3) Initial mode by power input : “Medium (4℃)”
※Whenever pressing button, setting is repeated in the order of 
Medium (4℃) →Medium Max (3℃) →Max (2℃) →Min (6℃) →Medium Min (5℃).
2℃ 3℃
4℃ 5℃ 6℃ Temp indicationMax Medium
Max 
Mid Medium
Min Min Temperature Change
5. “SUPER REFRIGERATOR” button.
When this mode is chosen, the icon (REFRIGERATOR QUICK) is ON.
6....

14
1. Defrost Mode
INPUTCONTROL OBJECT
CONTENTS REMARKS  1. Defrosting Cycle1. Comp
2. F-Fan
3. R-Fan
4. D-Heater
Pre-Cool
Pause
Fan-Delay
Heater
Defrosting
Pre-Cool
1) Time : 50 minutes
2) Comp , F-fan : ON
R-fan : Control
D-HTR : OFF
3) If F-sensor ≤-27℃, then Pre-Cool becomes. OFF
Heater
Defrosting
1) Comp, F-fan, R-fan : OFF
D-HTR : ON
2) Time limit
30 seconds : Heater is ON regardless of D-sensor
temperature right after defrosting start
30 minutes : in case of D1- Error
80 minutes : in normal...

15
CONTENTS REMARKS 
4. Flow Chart of Defrosting Start
Start
Comp. operating time
is over 24 hours?
Total time is
over 60 hours?
Comp. operating time
is over 6 hours?
EndDefrosting start
Comp. operating time
is over 2 hours?
Any error ?
NO
YES
NO
NO
YES
Total door open
time is over 2 min?
YES
YES
YES
YESNO
NONO
Comp. operating rate
is more 85%?
NO YES
 

16
1. A/S Defrosting Mode (Heater defrost →Pause →Fan Delay)
INPUTCONTROL OBJECT
CONTENTS REMARKS  1. Defrosting Cycle 1. Comp
2. F-Fan
3. R-Fan
4. D-Heater
Heater
Defrosting
1) Comp, F-fan, R-fan : OFF
D-HTR : ON
2) Time limit
30 seconds : Heater is ON regardless of D-sensor
temperature right after defrosting start
30 minutes : in case of D1-Error
80 minutes : in normal control state
3) If D-sensor ≥13℃, Heater Defrosting is OFF
Pause
Time : 7 minutes
Comp, F-fan, R-fan, Heater etc. : OFF
Fan-Delay
1)...

17
It is linked with comp. 
INPUTCONTROL OBJECT
CONTENTS REMARKS  1. CompLouver Heater 
1. Buzzer sounds if any button of Inner Control is pushed.
2. Buzzer sounds 4 times 3 seconds after initial power input.
3. Buzzer sounds for 3 or 1 times in case of A/S forced defrosting and short (pull down)
operation or explanation mode.
4. If door is open, buzzer sounds after every 1 minutes for 5 minutes (Door open  alarm)
INPUTCONTROL OBJECT
CONTENTS REMARKS  1. Control (Inner or F-PCB) buttons
2. Door Switch
3....

18
1. Start
Open and close “Freezer door  switch” 5 times while pushing “FRZ. TEMP” button
simultaneously.
2. Control
1) All other electrical components are OFF except for F-fan / R-fan
2) Fan Control
Door open →Fan ON  /  Door close →Fan OFF.
3) Display control
“FRZ. LED” and “REF. LED” are ON in good order
3. Stop
1) During Demo mode, push “Freezer door switch” open and close 5 times while pushing
“FRZ. TEMP” button simultaneously.
2) Power in again
INPUTCONTROL OBJECT
CONTENTS REMARKS  1. FRZ. TEMP
2....

19
Compensation of R-sensor ON/OFF temp. (down)
In case temperature of refrigerator compartment is weak or insufficient,
take the following action.
INPUTCONTROL OBJECT
CONTENTS REMARKS  Main PCBResistance of R-sensor Mid ON/OFF Point
R36 : R-SENSOR standard resistance in normal mode (31.4K)
R37 : In case of weak ref., cut J1 (or J18) to down the standard resistance by 1.5deg(2K)
R38 : In case of weak ref., cut J2 (or J19) to down the standard resistance by 1.5deg(2K)
4-9. Compensation of R-sensor ON/OFF...