Daewoo Frs 2011i Service Manual

							40
OPERATION AND FUCTIONS
 MICOM Circuit 
 Power 
 Circuit 
 
 
 
  DC Output Power (Voltage)    
Point Oscilloscope  Measurement Remarks 
 
 
 
 
  
* DC output 
 
15.7V 
11.96V 
 
 
						

							41
OPERATION AND FUCTIONS
  SMPS Movement Wave 
  Drain to Source Break Voltage 
Point  Oscilloscope  Measurement  Remarks 
SMP
SIC 
PIN 
1,2 
   *Voltage between 
DRAIN and 
SOURCE :   
below 650V 
 
  OVP(Overvoltage Protection) Wave at power input 
Point 
Oscilloscope  Measurement Remarks 
SMPS 
IC PIN 
3,4 
 *Minimum 
standard 
voltage  
OVP start :   
23.2V 
at
 
						

							42
OPERATION AND FUCTIONS
  Initial Power Wave of Switching Power IC 
Point 
Oscilloscope Measurement Remark 
SMPS 
IC PIN 
3,4 
  
 
						

							43
OPERATION AND FUCTIONS
 Sensors 
 Circuit Diagram 
 
 
 Fnction of Each Sensor 
[ F-sensor ] 
1) It senses the temperature of freezer compartment and controls Comp., F-fan ON / OFF. 
2) How it works ; 
Working Point Low ON  Mid OFF  High OFF 
Working Temp. -11.0   -20.0   - 26.0  
Resistance  14.74k    22.33k    30.92k  
Sensing Voltage  3.50 V   3.00 V   2.14 V 
 
[ D-sensor ] 
  It senses return point of defrosting heater. 
Working Point Return point of defrosting heater 
Working Temp. 10  
Resistance  19.53k   
Sensing Voltage  3.1 V 
 
[ R-sensor ] 
1) It senses the temperature of refrigerator compartment and controls R-fan ON / OFF. 
2) How it works ; 
Working Point Low ON  Mid OFF  High OFF 
Working Temp. 2.65   0.3   -1.7  
Resistance  26.88k   29.34k   32.00k  
Sensing Voltage  2.90V   2.81V   2.74V 
 C  C  C 
 C 
 C  C  C 
 
						

							44
OPERATION AND FUCTIONS
1) Cut J18 on M-PCB, then temp. is low e red -2   than [Mid OFF point]. 
2) In addition to 1) action, cut J22 on M-PCB, then the temp. is low e red -1   more. 
 Relay  Function  
 Circuit  Diagram  
 
  How it works ; 
ON Conditi on  OFF Condition 
C ontrol   Control  
Method MI CO M 
POR T  IC 2 Output  
PIN MICOM 
POR T  IC 03 Out put  PIN 
COMP  REPLAY 
REPLAY 
REPLAY 
REPLAY 
REPLAY 
REPLAY 
REPLAY 
REPLAY 
REPLAY  REPLAY  REPLAY #1 3.7V #10 0.7V #1 0V #10 12V 
R-LAMP  
#4 3.7V #11 0.7V #4 0V #11 12V 
DIS-LAMP  
#3 3.7V #12 0.7V #3 0V #12 12V 
DISP-SOL  
#5 3.7V #13 0.7V #5 0V #13 12V 
W A TER(ICE)  
#1 3.7V #10 0.7V #1 0V #10 12V 
W A TER(DIS)  
#4 3.7V #11 0.7V #4 0V #11 12V 
GEAR-M   
#3 3.7V #12 0.7V #3 0V #12 12V 
D-HTR  
#5 3.7V #13 0.7V #5 0V #13 12V 
F-LAMP  
#4 3.7V #11 0.7V #4 0V #11 12V 
CUBE-SOL   
#4 3.7V #11 0.7V #4 0V #11 12V 
W /S HTR 
#2 3.7V #14 0.7V #2 0V #14 12V 
 C 
 C 
* In case refrigeration of refrigerator compartment is poor or insufficient though comp. and R-fan 
  operate in normal way ;
 
						

							45
OPERATION AND FUCTIONS
 Fan Function
  How it works ; 
ON Condition  OFF Condition 
MICOM Port  MICOM Port Control 
Object Control 
Method 
31 32 33 IC Collector 
31 32 33 IC Collector 
Low (10V) 
operation 5V 0V 0V  10.35V  0V 
Mid (12V) 
operation 0V 5V 0V  12.19V  0V F-FAN 
High (14V) 
operation 0V 0V 0V  14.38V 5V 5V 5V 
0V 
 
ON Condition  OFF Condition 
MICOM PORT  MICOM Port Control 
Object Control 
Method 
39 40 41 IC Collector 
39 40 41 IC Collector 
Low  (10V) 
operation 0V 5V 5V  10.38V  0V 
Mid (12V) 
operation 5V 0V 5V  12.24V  0V R-FAN 
High (14V) 
operation 5V 5V 5V  14.42V 0V 0V 0V 
0V 
 
ON Condition  OFF Condition 
MICOM Port  MICOM Port Control 
Object Control 
Method 
37 38 IC Collector 
37 38 IC Collector 
High (14V) 
operation 0V 0V  14.54V  0V 
C-FAN 
Low (10V) 
operation 5V 0V  10.45V 5V 5V 
0V 
 
						

							46
OPERATION AND FUCTIONS
  Circuit Diagram of Main PCB 
 
 
						

							47
DIAGRAM
 < RSCR TYPE >
WIRING DIAGRAM
 
						

							48
DIAGRAM
 < CSR TYPE >
 
						

							49
DIAGRAM
CIRCUIT WIRING DIAGRAM
Main PCB