Daewoo DWF-7588TE, Руководство по обслуживанию

Страница: 18 / 34

31 30
3) CAUTION AND CHECKING FOR A/S
• If load is active as soon as the power switch is ‘ON’, check the driving TRIAC of load.
• Check the MICOM output terminal, if the load doesn’t act although the TRIAC isn’t anything wrong.
• Soemtimes it is happened that TRIAC DRIVE TR has circuit or an open circuit. In this case, being
measured the resistance between the TR E & C with tester, the resistance value should be near the
∞Ω
. If not, the DRIVE TR is out of order.
• If the ceramic condenser(C17, C19, C20, C23, C24, C29) using by protecting the noise between the
GATE & T1 of each TRIAC has a short circuit, it has no voltage drop between the T1 and GATE.
Therefore, the TRIAC is not turn on.
• If MICOM terminal No. 6 is not active from 5.4V to 0V, all DRIVE TR of the TRIAC are not turn on.
Therefore, the TRIAC is not out of order, to begin with, check the micom terminal No. 6 and TR Q2(KTA
1664) necessarily.
• The TRIAC’s names and values of the snubber & resistance of the total parts.
SM12JZ47(12A), SM8JZ47(8A), SM3JZ47(3A)
• CHECK the resistance of the T1 &
T2 of TRIAC. (
∞Ω
).
• CHECK the total parts without fail,
in case the TRIAC has a short
circuit.
BCR1AM-12L
• CHECK the resistance of the T1 &
T2 of TRIAC.(
∞Ω
).
• CHECK the total parts without fail,
in case the TRIAC has a short
circuit.
shape
T1 T2 G
shape
T1 G T2
LOAD
CW WASH
CCW WASH
DRAINAGE
HOT & COLD
WATER
BUBBLE
GENERATOR
PUMP
TRIAC’S NAME
SM12JZ47
BCR12PM-14L
SM12JZ47
BCR12PM-14L
BCR1AM-12L
SM3JZ47
BCR1AM-12L
SM8JZ47
BCR8PM-14L
GATE’S
RESISTANCES OF
LIMITED
CURRENTS
62
Ω
, 1/2W
62
Ω
, 1/2W
330
Ω
, 1/4W
62
Ω
, 1/2W
330
Ω
, 1/4W
62
Ω
, 1/2W
VALUES OF THE
SNUBBER
100
Ω
, 1W+683K
AC 250V
100
Ω
, 1W+683K
AC 250V
100
Ω
, 1W+103K
AC 250V
100
Ω
, 1W+223K
AC 250V
100
Ω
, 1W+103K
AC 250V
100
Ω
, 1W+103K
AC 250V
RESISTANCES OF
TOTAL PARTS
2) DETAIL EXPLANATION OF CIRCUIT ACTION (ACTION OF CW WASH)
• In case MICOM terminal No. 31 is ‘H’ and No. 6 is ‘L’ the Q1 (KTN2222S) & the Q2 (KTA1664) turn on
and control the TRIAC. The resistance, as 62
Ω
& 1/2W, of the R52 is used to limit the GATE current of
the TRIAC.
• The resistance R1(3.9K
Ω
, 1/4W) and the R5(1K
Ω
, 1/4W) control the base current of the Q1 & Q2 in
order as TR forces to turn on sufficiently.
• The ceramic condenser C29 between the T1 and the GATE of the TRIAC8 is used for preventing the
wrong action by means of the noise.
• The R63(100
Ω
, 1W) and C28(683K) between the T1 and T2 of the TRIAC is used for protecting the
TRIAC, it usually called SNUBBER CIRCUIT.
• The waveform of MICOM No. 31 & 6.
R1
3.9k
Ω
AC COMMON
C29
104Z
Q1
R3
10K
Ω
R4
10K
Ω
R5,1K
Ω
Q2
11
R2,62
Ω
HYBRID IC(IC9)
R63,100
Ω
,1W
TRIAC1
C28,683
M
I
C
O
M
6
9
10
7
31
action
action
stop
5.4V
0V
Terminal No. 31
t
t Terminal No. 6
5.4V
0V
action