Daewoo KOR-122M0A Service Manual page 48

6) When the digital clock does not operate properly
LVT1
POINT
A
If clock does not keep exact time, you must check resistor R21, R22 and capacitor C5
D12 R22
1N148M 10K
4.3V
GND
ZD2
R21
5.1V
4.7K
WAVEFORM
T
47
IC1
A
23
EXINT
C5
104
T: 20 ms(50Hz)
T:16.67ms(60Hz)
16.67ms(60Hz)