Oscillator; Reset Circuit; Door S/W Detector - Samsung SR-L676EV Service Manual

2. Oscillator

30P
x-tal
30P
Oscillating Fr equency
Port
Xin
Xout
±0.5% Error

3. Reset Circuit

R201
1K
KA7533
C203
1µF/25V
Port
Xin
Xout

4. Door S/W Detector

F-DOOR S/W
R-DOOR S/W
Samsung Electronics
30
Xin
31
Xout
4.00MHz
4.00MHz
R202
29
RESET
10K
C202
104
Voltage
5V
5V
CON06
It is designed for clock generation and time
calculation for synchronizing transmission and
reception on the logic elements inside the MICOM.
If the X-TAL specification changes, MICOM may
make an error. The standard components should be
used.
When power is supplied to MICOM, reset circuit
initializes RAM and other parts on MICOM to
initialize all programs. Reset voltage maintains
"low" for hundreds of µsec comparing to MICOM
Vcc voltage when power is input. It also maintains
"high"(5V) during normal operation. But, when Vcc
drops to 3.3V, reset port becomes "low".
Vcc
R401(4.7K)
R403(4.7K)
R402
7
10K
C401
104
R404
8
10K
C402
104
19