DONGBU DAEWOO ELECTRONICS FR-T650NTB SERIES User manual

RTT512NBG.. RTT512NWG..
April. 2016.

1
C O N T E N T S
WARNINGS AND PRECAUTIONS FOR SAFETY -------------------------------- 2
1. SPECIFICATION ----------------------------------------------------------------------- 3
2. NAME OF EACH PART -------------------------------------------------------------- 4
3. COLD AIR CIRCULATION ---------------------------------------------------------- 5
4. WIRING DIAGRAM -------------------------------------------------------------------- 6
5. PCB CIRCUIT DIAGRAM ------------------------------------------------------------ 7
6. HOW TO REPLACE THE PARTS ------------------------------------------------ 8
7. PCB CONTROL FUNCTION ----------------------------------------------------- 16
8. EXPLODE VIEW AND PARTS LIST ------------------------------------------- 24

2
Please observe the following safety precautions in order to use safely and correctly the refrigerator
and to prevent accident and danger during repair.
1. Be care of an electric shock. Disconnect power cord from wall outlet and wait for more than
three minutes before replacing PCB parts.
Shut off the power whenever replacing and repairing electric components.
2. When connecting power cord, please wait for more than five minutes after power cord was
disconnected from the wall outlet.
3. Please check if the power plug is pressed down by the refrigerator against the wall.
If the power plug was damaged, it may cause fire or electric shock.
4. If the wall outlet is over loaded, it may cause fire.
Please use its own individual electrical outlet for the refrigerator.
5. Please make sure the outlet is properly earthed, particularly in wet or damp area.
6. Use standard electrical components when replacing them.
7. Make sure the hook is correctly engaged.
Remove dust and foreign materials from the housing and connecting parts.
8. Do not fray, damage, machine, heavily bend, pull out or twist the power cord.
9. Please check the evidence of moisture intrusion in the electrical components.
Replace the parts or mask it with insulation tapes if moisture intrusion was confirmed.
10. Do not let the customers repair, disassemble and reconstruct the refrigerator for themselves.
It may cause accident, electric shock, or fire.
11. Do not store flammable materials such as ether, benzene, alcohol, chemicals, gas, or
medicine in the refrigerator.
12. Do not put flower vase, cup, cosmetics, chemicals, etc., or container with full of water
on the top of the refrigerator.
13. Do not put glass bottles with full of water into the freezer.
The contents shall freeze and break the glass bottles.
14. When you scrap the refrigerator, please disconnect the door gasket first and scrap it
where children are not accessible.
WARNINGS AND PRECAUTIONS FOR SAFETY

3
1. SPECIFICATION
Item Specification
ISO Gross
Volume
(Li)
Total 525 Li
Freezer Compartment 163 Li
Fresh Food Compartment 362 Li
ISO Storage
Volume
(Li)
Total 492 Li
Freezer 142 Li
Refrigerator 350 Li
Weight Total 89.3Kg
External
Dimension Width x Depth x Height 768 mm X 732 mm X 1770 mm

4
1. Freezer Compartment LED Lamp 6. Fresh Food Compartment Sensor
2. Freezer Compartment Shelf 7. Vegetable Case
3. Freezer Compartment Temperature Controller 8. Freezer Compartment Pockets
4. Fresh Food Compartment LED Lamp 9. Fresh Food Compartment Pockets
5. Fresh Food Compartment Shelves
1
3
2
4
5
6
7
8
2. Name Of Each Part
9

5
3. Cold Air Circulation

6
4. Wiring Diagram

7
5. PCB CIRCUIT DIAGRAMS

8
6. How To Replace The Parts
6-1. Freezer Louver Part
No Photos Description
1- Remove ‘Freezer Shelf’ at first.
2- Remove 4 screws on ‘Freezer Louver’.
3- Pull forward the ‘Freezer Louver’.
- Then disconnect ‘Freezer Motor’.
4- Disassemble the ‘Cover Fan F AS’.
- Be careful not to damage the hook.

9
6-2. Cover Fan F As
No Photos Description
1- Remove ‘Cover Fan B’.
2- Replace ‘Knob F Control’.
Cover Fan B

10
6-3. Freezer Motor As
No Photos Description
1
- Remove 2 screws.
- Remove Clamp Fan with pliers and then
disassemble ‘Fan’ with (-) driver.
- Unscrew the earth wire bolt.
2- Remove the screws holding the bracket.
3- Now disassemble the ‘Freezer Motor’.

11
6-4. Evaporator
No Photos Description
1- Remove the screw which fixes evaporator.
2
- Pull forward the evaporator and pipes.
- Be careful not to bend the pipes.
3
< Defrost Heater >
- Disconnect ‘Defrost Heater’ lead wire on
the right.
- Disconnect ‘Temperature Fuse’ lead wire
and ‘Defrost Sensor’ lead wire on the left.
- Disassemble the ‘Defrost Heater’.
Defrost Heater

12
6-5. M/Flow-Duct
No Photos Description
1
- Remove ‘Deco M/F Duct’ with (-) driver.
- Remove ‘Cover sensor’ with (-) driver.
2- Disconnect ‘R Senosr ‘ lead wire.
3- Remove the screws on the ‘ Cover M/F Duct’.
4- Separate Cover M/F Duct with Insulator.
5- Disassemble the R ‘Sensor ‘

13
6-6. LED Lamps
No Photos Description
1- Remove ‘Freezer Lamp Window’.
- Be careful not to damage the hook.
2
- Unlock the hook on the side of ‘Fixture lamp’
and disassemble the LED lamp.
- Disconnect ‘LED Lamp’ lead wire.
No Photos Description
1- Remove ‘Refrigerator Lamp Window’.
- Remove the screw on the LED lamp.
2
- Unlock the hook on the side of ‘Fixture lamp’
and disassemble the LED lamp.
- Disconnect ‘LED Lamp’ lead wire.
Freezer compartment LED lamp
Fresh Food compartment LED lamp

14
No Photos Description
1- Remove ‘cap FCP’.
- Remove the screw on the cap FCP.
2
-Unlock the hook on the botton of the
‘cap FCP ‘ with (-) driver.
- Disassemble the ‘cap FCP’.
3- Disconnect ‘Front PCB‘ lead wire.
6-7. Front PCB

15
No Photos Description
1
-Remove the screws and disassemble
the ‘Grille As’.
2- Remove the screws and disassemble
the ‘Box Main PCB As’.
3- Disconnect Hosings on the ‘Main PCB’.
6-8. MAIN PCB

7-1. DISPLAY
INPUT CONTROL OBJECT
●PCB Control Panel Buttons ●PCB Control Panel LED
Temperature adjustment
button for refrigerator
compartment.(-) “S-COOL” button
7. PCB CONTROL FUNCTION
“LOCK” button “SAVE” button
1. “fridge”button
(1) When touch “fridge”, it controls temperature of refrigerator by step.
(2) When selecting each dial, it operates with selected dial indication value.
(3) When touch “fridge”, it controls temperature by step(7Step) and when input electric source, initial setting
displays ‘medium’ temperature. Display sequence : (3℃)→(2℃)→(1℃)→ (0℃)→(6℃) →(5℃)→(4℃)
(4) Adjust Refrigerator set temperature and display
2. “S-Cool” button
1) When S-cool mode is chosen, the icon S-cool icon is ON
2) When Pushing the button again, the icon is OFF
Temperature
Adjust light Light medium1
Light
medium2 medium Medium strong1
Medium
strong2 strong
Set temp.(℉) 43 41 39 37 35 33 31
Set temp.(℃) 6 5 4 32 1 0
3. Lock (Here in after indicates as “Locking”)
(1) Entering method: When press “Locking”button for 0.5 second, “Locking Icon” becomes on. When “Locking”
function is set, all other key operation is not possible (Includes dispenser switch) and also buzzer does not
operate.
(2) Release method: When press “Locking”button for 3 seconds,“Locking Icon” becomes off and release
“Locking”.
4. . Save function
(1) When Save mode is chosen, the Save icon is ON
(2) When Pushing the button again, the icon is OFF
(3) When selecting Save mode, it operates with light dial value.
5. Display off function ( PCB energy saving function)
(1) When it passes 1minutes without key operation or door operation, 88 display, s-cool icon ,lock icon and save
icon become off.
(2) When there is operation for key or door at LED off condition, LED display with normal condition.
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7-2. Temperature Control of Refrigerator Compartment
INPUT CONTROL OBJECT
●PCB Control Panel “fridge” Buttons
●R-sensor
●PCB Control Panel LED
●COMPRESSOR, FAN
1. Adjust temperature mode of refrigerator by pressing adjust refrigerator.
Temperature adjusting steps: light → light medium 1 → light medium 2 → medium → medium strong 1→
medium strong 2→ strong
Set Display : 6℃5℃4℃3℃2℃1℃0℃
2. Refrigerator on/off difference : 4.0℃
(Off point of refrigerator: 2.0℃)
3. Refrigerator step difference
light → light medium 1 → light medium 2 → medium → medium strong1 → medium strong2 → strong
: 1 deg. for each step
4. R-fan and compressor is controlled by on/off point of each mode.
1) When R-sensor becomes on condition, F-Fan and compressor are operated.
2) When R-sensor becomes off condition, F-Fan and compressor are stopped.
5. Control point per each mode
Light MID Strong
Light Ref. Point
ON Point
OFF Point
9.0℃
2.0℃
7.0℃
1.0℃
7.0℃
0.0℃
5.5℃
-1.0℃
2.0℃
-2.0℃
1.0℃
-3.0℃
0.0℃
-4.0℃
4.0℃ 2.0℃ 2.0℃
6.0℃ 5.0℃ 4.0℃ 3.0℃
Temp
17

7-3. Defrost Mode
INPUT CONTROL OBJECT
●Total COMP Work Time ●COMP Working Rate
●Total Door Open Time ●RT ●Defrost Mode
A. When total operation time of compressor becomes: 6, 8, 10, 12 hours.
ⓐany error mode-R1, D1, F3, C1, RT/S, Door SW error- happens.
ⓑor, running rate of COMP (per 2hrs of total operation time) is more than 90%.
ⓒor, total door open time is over 2 minutes.
B. Even if the above condition “A” is not satisfied,
ⓐDefrost mode starts immediately when total operation time of COMP is 14hrs.
ⓒor, defrost mode starts immediately as long as total time (COMP on time + COMP off time) is 24 hrs
at Low RT A,B period
ⓑor, defrost mode starts immediately as long as total time (COMP on time + COMP off time) is 60 hrs.
A. General Defrost Mode
ⓐHow to start: By conditions of defrost
ⓑProcess :
General operation→
“PRE-COOL” →Defrost Heater on→ Pause(10 min )→ General operation
※PRE-COOL: When the defrost heater works, the temp. of freezer increases.
So the COMP works for 25 min before defrost mode.
ⓒLimited Time of Defrost Heater
●40 minutes: Heater turns off when “D SENSOR” is OPEN or SHORT.
●50 minutes: Heater turns off after 50 minutes.
ⓓHeater Off: When the temperature at “D SENSOR” is over 10°C
B. Forced Defrost Mode
ⓐHow to start: by press “temp” button for continuously and “s-cool” button 5 times.
ⓑProcess: same as General Defrost Mode except “PRE-COOL”
※Heater is on Initial 30 seconds even though the temp. at “D SENSOR” is over 10°C.
(for TEST)
ⓒHow to confirm: by press “temp” button for continuously and “lock” button 5 times.
And then, the mode displays.
ⓓDisplay : “d2” is displayed.
●Conditions of Defrost Mode
●Defrost Mode
PRE-COOL Defrost Mode Pause
Compressor ON OFF OFF
Fan ON OFF OFF
Defrost Heater OFF ON OFF
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7-3. Defrost Mode
INPUT CONTROL OBJECT
●Total COMP Work Time ●COMP Working Rate
●Total Door Open Time ●RT ●Defrost Mode
A. In providing initial power or returning power failure,
if the temperature at the D-sensor is under 3.5°C, Defrost Mode starts. (It proceeds from “PRE-COOL”.)
[ “PRE-COOL” → Heater on → Pause(10 min) → General operation ]
B. Initial defrost mode starts after “Prevention of Compressor Restart”. (Refer to Function No. 5)
●Initial Defrost
●Flow Chart of Defrost Start
Start
Total time ≥ 60hrs
COMP time ≥ 14hrs
COMP time ≥ 6hrs
COMP Rate ≥ 80%
Any error?
Total door open time
≥ 2 min?
END
Defrosting start
COMP time ≥ 2hrs
YES
YES
YES
YES
YES
YES
NO
N0
N0
N0
NO
NO
NO
NO
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