Daewoo DWF-4220 Series, Service Manual

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29
LOAD DRIVE UNIT
(CW WASH, CCW WASH, DRAINAGE, BUBBLE, PUMP, HOT WATER, COLD WATER)
1. CIRCUIT DIAGRAM AND EXPLANATION
• Controlling load of button input in MICOM terminal, it is selected to 'H' or 'L'. It is selected to 'L' in running load case and
in 'H' case, load driving is finished. In clockwise rotation of washing motor, as MICOM No. 10 is changed 6V to 0V, TR
(Q8, A1270Y) is turn on. And then, the TRIAC1 (SM12JZ47) is turn on, the source of electric power is supplyed to washing
motor for clockwise rotation. The TRIAC, as switching element, force to 'ON' or 'OFF' by use of the Q8 (A1270Y). In the
rest loads, when the MICOM terminal voltage changes 6V to 0V, each TRIAC DRIVE TR is active, and then the TRIAC
switches the source of electric power to loads.
• The purpose of using the MICOM terminal No.3 Q15 (A1271Y) is that the Q15 prevents the instant supply of electric power
supply to loads, in case MICOM's action is wrong by means of pushing initial power switch.
R67
Q8
A1270
R21
R1 C1 683k
100 1W
SM12JZ47
C2
104Z
1 BL/YW
10K
3.3K
2 VT
TRIAC1
R69
Q9
A1270
R20
R2 C3 683k
100 1W
SM12JZ47
C4
104Z
10K
3.3K
3 BL
TRIAC2
R71
Q11
A1270
R19
R5 C9 103k
100 1W
BCR1AN
C10
104Z
10K
3.3K
4 YW/BK
TRIAC3
R70
Q10
A1270
R13
R4 C7 103k
100 1W
BCR1AN
C8
104Z
10K
3.3K
5 PK
TRIAC4
R72
Q12
A1270
R12
R3 C5 103k
100 1W
SM3JZ47
C6
104Z
10K
3.3K
6 BL/WH
TRIAC5
R73
Q13
A1270
R10
R6 C11 223k
100 1W
SM3JZ47
C12
104Z
10K
3.3K
7 YW
TRIAC6
R74
Q14
A1271
R10
R7 C13 273k
100 1W
SM3JZ47
C14
104Z
10K
3.3K
8 RD/BL
R75
Q15
A1270
10K
3.3K
SM3JZ47
62
R1/2W
62
R1/2W
330
330
62
R1/2W
62
R1/2W
62
R1/2W
R51 10
R53 9
R52 8
R50 7
R43 6
R42 5
R41 4
R40 3
RA2
RA1