Daewoo Erf 396 Service Manual

							  16. R-SENSOR 
OFF POINT 
ADJUSTING 
OPTION 1) R-SENSOR OFF POINT can be adjusted by changing the input voltage of MICOM 26 
pin. 
2) The default of input voltage is 0V. 
3) The changed OFF POINT is base OFF POINT + OFF POINT of input voltage. 
  
 
4) The change of R-SENSOR OFF POINT depend on the input voltage of MICOM 
 
MICOM 
Input (V) 0 1.0 1.5 2.0 2.5 3.7 5.0 OFF 
POINT 
Variation 
(ºC) -0.5ºC 
(DEF) 1.0ºC 
down 2.0ºC 
down 3.0ºC 
down 1.0ºC 
 up 2.0ºC  
up 3.0ºC  
up R26, R27 
Resistan
ce 
(kOhms) Jumper  
adoption R27 : 40 
R26 : 10 R27:23.3 
R26:10 R27:15 
R26:10 R27:10 
R26:10 R27:3.5 
R26:10 R27:10 
R26:DEL  5) APPLICATION (MAIN PCB) 
5.1- GENERAL: MICOM 26 port - 0V 
5.2- DELETE J2 (CHANGING R OFF POINT 1DEG UP) : MICOM 26 port – 2.5V  
LOW COOLING 
OPTION - R-SENSOR OFF POINT ADJUSTMENT (1 DEG. DOWN) 
- J1 DELETION on LOW COOLING OPTION 
Default resistance (31.4 Kohms) + 1.5 kohms = 32.9 Kohms 
Operating on condition that R-SENSOR OFF point goes down 1ºC.  
 
 
 30  
						

							  13.2. ERF-XXXN  
NO FUNCTION CONTENTS 1. 
DISPLAY   
 
-  Temperature control of Refrigerator 
Maximum angle clockwise : Temperature setting for SUPER  
Maximum angle counter-clockwise : Temperature setting for VACATION  
Maximum rotation : 280±10° 
Minimum Step Difference : 0.7 deg/28° 
Total step Difference : 6.3 deg 
 
ERROR LED DISPLAY (ON MAIN PCB) DISPLAY ¦++Ù LED +ÔÀ-ã-ó ?FUNCTION DISPLAY 
- D1 ERROR : LED is off & on one time. 
- D2 ERROR : LED is off & on two times. 
- R1 ERROR : LED is on & off one time. 
- RT ERROR : LED is on & off two times. 
- DR ERROR : LED is on continually 
- Buzzer sounds if any button of M-PCB(SW2) is pushed. 
- FORCED DEFROST OF CONDITION : Button of M-PCB(SW2) is pushed 1 time. 
- SHORT CIRCUIT OF CONDITION : Button of M-PCB(SW2) is pushed 2 times. 31  
						

							  2. TEMPERATURE 
ADJUSTMENT 
& 
CONTROL 1) TEMPERATURE ADJUSTMENT 
1.1- TEMPERATURE ADJUSTMENT 
TEMP CONTROL DIAL is rotated VAC , LOW, MIDDLE, HIGH, SUPER. 
TEMPERATURE will be set if the Dial doesn’t get rotated again within 5 sec 
1.2- FORCED DEFROST : Button of M-PCB(SW2) is pushed 1 time. 
1.3- SHORT CIRCUIT OPERATION : Button of M-PCB(SW2) is pushed 2 times. 
 
2 )TEMPERATURE CONTROL 
2.1- COMP will be controlled by the on/off point of R-Sensor at each mode. 
2.2- STEP DIFF of ROOM R : 1.4 deg 
2.3- Middle OFF point of ROOM R : -0.15°C 
2.4- ON/OFF DIFF of ROOM R : 3 deg 
 ON -í
OFF -í2.85¡É-0.15¡É5.65¡É2.65 ¡É0.05 ¡É-2.95¡É1.25¡É-1.55¡É1.45¡É4.25¡É 
3 )FORCED DEFROST 
3.1- Defrost mode will be Started independent of the cycle. 
3.2- The flow is same as the general defrost mode flow. 
4 )SHORT CIRCUIT  OPERATION 
4.1- COMP & FAN will be on independent of the operation condition. 
 4.2-The time limit of SHORT CIRCUIT OPERATION: 60 hrs  3. 
VACATION - Rotate TEMP. CONTROL Dial and make Vacation Location. 
ON POINT: 5.65°C 
OFF POINT: 2.65°C 32  
						

							  4. SUPER  - Rotate TEMP. CONTROL Dial and make Super Location 
ON POINT: 0.05°C 
OFF POINT: -2.95°C 5. DETERMINATION 
OF 
DEFROST - Starting condition of Defrost Mode 
 - When accumulated running time of comp. is 8, 10, 12, 18, 30hrs. 
  - After Checking the condition ‘2.1’ if total time(COMP on time + COMP off time) is 
more than 24, 48, 36, 72hrs, then defrost mode starts immediately.  
 
Accumulated running time of 
COMP Total running time of COMP  
RT-SENSOR 
Door Open Door Close Door Open Door Close RT 29°C Up 8HR 18HR 24HR 36HR 20
						

							  9. ERROR 
DISPLAY 
& 
CONTROL * ERROR DISPLAY 
a.  When error happens, it is displayed on led lamp.(Main PCB LED 1) 
1) R1 ERROR (It happens when R-SENSOR is OPEN or SHORT) 
1.1- DISPLAY : On & off one time while LED is on. 
1.2- CONTROL : Controlled by the condition of RT 
                                                         (Unit : min) 
RT-S TEMP RT-S ERROR 19ºC Down 20ºC Up COMP. Operating TIME (ON / OFF) 20 / 30 15 / 35 22 / 28  1.3- CANCEL : when R-SENSOR is working normally. 
2) D1 ERROR (It happens when D-SENSOR is OPEN or SHORT) 
 2.1- DISPLAY : On & off one time while LED is off. 
 2.2- CONTROL : Return to the limit defrost time of Defrost (30 min) 
3) D2 ERROR (It happens when heater is off by time ? 80 min). 
3.1- DISPLAY : On & off two times while LED is off. 
3.2- CONTROL : Return to next limit defrost time (80 min) 
4) RT ERROR (It happens when RT-SENSOR is OPEN or SHORT) 
4.1- DISPLAY : On & off two times while LED is on. 
 4.2- CONTROL : The system is normally operating but the controlling by RT-
SENSOR doesn’t work. 
 4.3- CANCEL : when RT-SENSOR is working normally. 
5) DR ERROR 
 5.1- Display : LED is on continuously 
 5.2- Control : Deletion of function related door switch sensing 
 5.3- If door switch(open & close) is sensed, the error is terminated automatically. 10. SHORT CIRCUIT 
TEST  
1) START : Button of M-PCB(SW2) is pushed 2 times and SW1 6 times. 
2) CANCEL : Button of M-PCB(SW2) is pushed 1 time. 
 Cf. the system generally operates after the limit time 60 hrs. passes. 
3) CONTROL : COMP & FAN will be on independent of the operating condition. 
             (There is no defrost mode on this test.) 11. 
FUNCTION 
OF 
TIME 
REDUCTION 1) HOW TO REDUCE: (There is no FAST KEY on PCB for MP.) 
        1 min : Click FAST KEY one time 
       30 min : If you press FAST KEY continuously, you can reduce 30 minutes on 
each second.    
2) Practical Use : Can be applied to reduce needless time on test. 
    EX) function of stop for 6 min  34  
						

							  15. FUNCTION 
OF 
LOW ROOM 
TEMPERATURE 1) Condition of LOW RT TEMP :  
1.1- LOW RT A : RT SENSOR  RT-S < 19ºC 
2) Control 
2.1- When Comp. is on, R-SENSOR HTR is off. 
When it passes 6 min after COMP. is off, R-SENSOR HTR is on until COMP  is on. 
2.2- COMP. can’t be on within 40 min. after COMP. is off. 
2.3- When it is not the Mode of LOW ROOM TEMP. or RT-SENSOR is on 
ERROR(open or short), R-SENSOR HTR is off. 
 - LOW RT TEMP  A  Condition 
R-SENSOR Operating Temperature 1ºC up 
  - LOW RT TEMP  B  Condition 
R-SENSOR Operating Temperature  16. 
R-SENSOR 
OFF POINT 
ADJUSTING 
OPTION 1) R-Sensor OFF Point can be adjusted by changing the input voltage of Micom 26 pin. 
2) The default of input voltage is 0V. 
3) The changed OFF Point is base OFF POINT + OFF POINT of input voltage. 
  
 
4) The change of R-SENSOR OFF POINT depend on the input voltage of MICOM 
 
MICOM 
Input (V) 0 1.0 1.5 2.0 2.5 3.7 5.0 OFF 
POINT 
Variation 
(ºC) -0.15ºC 
(DEF) 1.0 
Down 2.0 
Down 3.0 
Down 1.0  
Up 2.0  
Up 3.0  
Up R26, R27 
Resistan
ce 
(KOhms) Jumper  
adoption R27 : 40 
R26 : 10 R27:23.3 
R26:10 R27:15 
R26:10 R27:10 
R26:10 R27:3.5 
R26:10 R27:10 
R26:DEL 35  
						

							   5) APPLICATION (MAIN PCB) 
5.1- GENERAL: MICOM 26 port - 0V 
5.2- DELETE J2 (CHANGING R OFF POINT 1DEG UP) : MICOM 26 port – 2.5V  
LOW COOLING 
OPTION a. R-SENSOR OFF POINT ADJUSTMENT (1 DEG. DOWN) 
b. J1 DELETION on LOW COOLING OPTION 
Default resistance (31.4 KOhms) + 1.5 KOhms = 32.9 KOhms 
Operating on condition that R-SENSOR OFF point goes down 1ºC.  
 36  
						

							DAEWOO ELECTRONICSMANUFACTURING ESPAÑA S.A
Polígono industrial de Júndiz
C/Zurrupitieta 27, 01015 Vitoria, Spain
Tel: 00 34 945292292
Fax:00 34 945290965