Daewoo DWF-4220 Series, Service Manual, Page: 35 / 57

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• The Electrolytic condenser C22(1000µF, 16V) and diode D5 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. 42 has instant interruption of
electric power, yet the MICOM is not discharged electricity because of the diode D5.
• The measurement of voltage
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 condenser in case the electrolytic condenser and ceramic condenser
have short circuit. The reason is that it happerns 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 voitage ‘ON’ from the zero
voltage.
EFFECTIVE VALUE
@ # $ %
!
82.5V 5.2V 7.9V 7.9V 5.97V 5.4V
119V 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 10.6 5.98V 5.4V
275V 9.7V 13.7V 13.7V 5.98V 5.4V
INPUT OUTPUT
GND
7806
MICOM
C21
103Z
Q6
C3202
R47 220
R50 3.9K
C24
103Z
R61 22K
R60 10K
D1 1N4003
!
@
37
D4 1N4003
• The waveform of the part
!
• Thewaveform of the part
@
(in case of cutting the part of
the dotted line)
f=50Hz or 60 Hz
Vpeak=11.4V
Vrms=8V
0V