Daewoo DWF-5590DP Series, Service Manual

Page: 33 / 63

WATER LEVEL SENSOR UNIT
1) CIRCUIT DIAGRAM
2) EXPLANATION OF CIRCUIT
• Push the power switch. And, in order to carry on the action of course selection, input the selection of frequency
according to each water level selection.
• The frequency of water level sensor in each water level becomes square wave and is sended to the MICOM.
If the water level is selected ‘HIGH’ in washing, water supply proceeds until inputing the frequency 22.70 KHz of ‘HIGH’ in
the MICOM terminal No. 24. Being finished the water supply, washing process is proceeded. After the washing process,
water level reaches to RESET point, and then after the (D)+ 60 seconds, the spin process begins.
• The value of the frequency between the MICOM terminal No. 24 and the GND.
3) CAUTION FOR A/S
• The output of the frequency in the WATER LEVEL SENSOR varies in accordance with temperature and using condition.
If it doesn’t input the output of the WATER LEVEL SENSOR in the MICOM, the error message is displayed as ‘E9’. In
case of proceeding the water supply continuously in ‘HIGH’ water level, it is desirable to change the WATER LEVEL
SENSOR because of the defect in the WATER LEVEL SENSOR.
• Check the TR Q4(A1270Y).
• Being checked with tester, the value of the voltage reaches about 4V.
• As the frequency is lower, the water level is higher.
33
M
I
C
O
M
R18,220
Q4
A562
R20,10K
R22,3.9K
R21,10K
24
WATER LEVEL NAME FREQUENCY WATER LEVEL DWF-5590
PUMPING 22.11 KHz 375
¡
15 -
HIGH 22.46 KHz 345
¡
15 52L
MEDIUM 23.08 KHz 290
¡
15 44L
LOW 23.71 KHz 235
¡
15 36L
SMALL 24.33 KHz 180
¡
15 28L
RESET 25.05 KHz
0 25.30 KHz
0V
5.4V
f = 22 ~ 25 KHz
KHz
WATER LEVEL NAME FREQUENCY WATER LEVEL DWF-5590