DAEWOO ELECTRONICS DWF-5590DP Series, Service Manual, Page: 36 / 63

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
• When 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 Q17 (C3202Y) with tester and 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, R11 & C7
(104Z), as a RC fiter, is used in order to absorb the noise.
• The waveform measurement of the part
!
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
36
0V 0V
5.4V
M
I
C
O
M
10
R11,220
R12,10K
IC3
RESET IC
S-8054HN
D2,1N4003
+ +
C7
104Z
C8
47µF
16V
1000µF
16V
C13
POWER SWITCH ON
RESET TIME
500 msec
190 msec
4.9V
5.4V
POWER OFF
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