Daewoo DSB-071AH, Service Manual

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81
Triac Driving(4)
DESCRIPTION
Number 38 Terminal of Micom is put out Pulse Output, by way of Buffer it is driving Photo Triac is supplied
Trigger Signal.
Trigger Test of Triac is detected Zero Cross Part of AC input and it is triggered from Zero Cross part to Time
delay part according to Fan Speed. (Ref. Fig 4-1) SN1 is Snubber.
N
L
AC 220V
TO MOTOR
T1
SM3JZ47
L1
1 2
130
µ
H
3A
SN1
0.1
µ
F
120Ohm
TLP561
PT1
12V
R5
1K
1/2W
IC4
KID 65004
MICOM
38
2 15
AC220V
TRIGGER
MOTOR
INPUT
LOW SPEED MEDIUM SPEED HIGH SPEED
Fig 4-1
LOW SPEED
MEDIUM SPEED
HIGH SPEED