10-1) Source Power Circuit; 10-2) Oscillator Circuit - Samsung RB2044SL Service Manual

Circuit Descriptions

10-1) Source Power Circuit

Voltage
(DC 12V)
Vcc (DC 5V)
1) The input AC voltage drops to AC 8 volts on the transformer secondary side between ①~③ at CN
10. The rectified voltage passed through D101 ~ 104 becomes DC 5V through voltage regulator
MC7805(REG1).
This (DC5V) is supplied to the control board and sensor's circuits.
2) The input AC Voltage drops to AC 15 volts on the transformer secondary side between ⑤~⑦ at
CN 10. The rectified voltage passed through D105 ~ D108 becomes DC 12V through voltage
regulator MC7812CT (REG2).
This (DC12V) is supplied to the relay operation and LED display.

10-2) Oscillator circuit

Oscillating Frequency
Port
Xin(#19)
Xout(#20)
±0.5% Error
4.00MHz
4.00MHz
Circuit used
Relay Operation & LED Display
Power around MICOM & Sensor Detector
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.)
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