Daewoo DWF-7588TE, Руководство по обслуживанию

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The waveform of the secondary part in transformer passes through the diode D6, D9(1N4003), and then
the voltage is divided by means of the resistance R64 & R65. This voltage gives force to input the pulse to
the MICOM terminal No. 21 on the ground of action of the TR Q17(C3202Y).
3) CAUTION FOR A/S
• The phenomenon of no electric power supply happens, to begin with check the electric power supply
unit, and then check the INTERRUPT UNIT. It is desirable to measure the Q17(C3202Y) with tester and
the C10(C103Z).
RESET UNIT
1) CIRCUIT DIAGRAM
2) EXPLANATION OF CIRCUIT
• The RESET unit is a hardware circuit, of which all programs are initialized, when the power switch is
‘ON’, Here, the reason why uses RESET I.C. is that the RESET UNIT prevents the MICOM from
incorrect action. Also, the R11 & C7(104Z) as a RC filter, is used in order to absorb the noise.
• The waveform measurement of the part
1
with being ‘ON’ the power switch.
3) CAUTION FOR A/S
• Check the output of the RESET I.C. and judge whether or not it is something wrong,
1. OUTPUT
2. INPUT(VDD)
3. GROUND
• The R12 and C8 turn on the accurate RESET value with controlling the RC time constant.
• After connecting the part of the dotted line &
waveform measurement
• The waveform measurement in the MICOM
No. 21
0V 0V
8.35ms
5.4V
10
R12,10K
IC3
RESET I.C.
S-8054HN
C8
47
µ
F
16V
3300
µ
F
10V
C7
104Z
R11,220
D2, 1N4003
M
I
C
O
M
1
5.4V
4.9V
190ms
POWER OFF
POWER SWITCH ON
RESET TIME
500ms
2
1
3
• The Electrolytic condenser C13(3300µF, 10V) and diode D2 is used in order that at instant power supply
failure circuit should remember the contents of the program. It happens that the MICOM terminal NO, 16
has instant interruption of electric power, yet the MICOM is not discharged electricity because of the
diode D2.
• The measurement of voltage is as follows.
3) CAUTION FOR A/S
• Measure the voltage of input terminal REGULATOR I.C of 7806 with
tester. And, compare the measuring value with the voltage table.
• Check the condendser in case the electrolytic condenser and
ceramic condenser have short circuit. The reason is that it happens
no electric power supply.
INTERRUPT UNIT
1) CIRCUIT DIAGRAM
2) EXPLANATION OF CIRCUIT
The INTERRUPT UNIT is necessary to reduce the generation of surge, by use of being voltage ‘ON’ from
the zero voltage.
• The waveform of the part
1
1
EFFECTIVE VALUE
2 3 4 5
82.5V 5.2V 7.9V 7.9V 5.97V 5.4V
110V 7.2V 11V 11V 5.97V 5.4V
137.5V 9.3V 14.1V 14.1V 5.98V 5.4V
165V 5.3V 7.6V 7.6V 5.96V 5.4V
220V 7.6V 10.6V 10.6V 5.98V 5.4V
275V 9.7V 13.7V 13.7V 5.98V 5.4V
7806
INPUT OUTPUT
GND
M
I
C
O
M
1
2
D9,1N4003
D6,1N4003
R65
22K
C35
103Z
R64,10K
R23, 3.9K
R19,220
Q17
C1959
C10
103Z
21
0V
0V
• The waveform of the part
2
(in case of cutting
the part of the dotted line)