Daewoo DWF-5590DP Series Service Manual page 38

• Part of the button scan
The system of the BUTTON SCAN is in wide use for the method of the DUTY output part in L. E. D DRIVE yet here. It is in
use for the method of the segmental output.
• Though the period of the DUTY part is 1/9, the last 9th part does not generate the waveform and checks the button input
with getting out the segmental output at the same time.
• RA1 (473J, 47KΩ) is a 'PULL DOWN' resistance for preventing floating action.
• D15 prevents the L. E. D from turning on unnecessarily with forming the closed loop like a threaden line at the time of
button push.
6
IC06
SW4
D11
SW3 SW3
D12
RA1,473J
D15
R66.22O
D13
R67.22O
Waveform
No Generation
Segmental Waveform for
Button Input
51 BUTTON SCAN
62 SEGMENTAL PART
MICOM
57
PART OF THE
BUTTON INPUT
58
Duty part
Segment part
38