Daewoo DWF-4230 Series Service Manual page 16

• After connecting the part of the dotted line & waveform
measurement
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The waveform of the secondary part in transformer passes through the diode D12, D13 (1N4003), and then the voltage is
divided by means of the resistance R37 & R41. This voltage gives force to input the pulse to the MICOM terminal No. 31 on
the ground of action of the TR Q7 (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 Q7 (C3202Y) with tester and C9 (C103Z) and C8 (103Z).
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 R13 & C4
(104Z), as a RC fiter, is used in order to absorb the noise.
• The waveform measurement of the part 1 with being 'ON' the power switch.
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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 C5 turn on the accurate RESET value with controlling the RC time constant.
• The waveform measurement in the MICOM No. 31
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33
BUZZER UNIT
1) CIRCUIT DIAGRAM
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2) EXPLANTION OF CIRCUIT
• After the button action and total process ends, BUZZER is active.
• It is active directly with offering an output the frequency waveform of 2.8 KHz from the MICOM terminal No. 6
BUTTON INPUT UNIT
1) CIRCUIT DIAGRAM
34