Temp·sensing Part; Key Scan And Display Parts; Key Scan And Display Operating - Samsung SR-61KTC Service Manual

5. TEMP·SENSING PART
1) Thermistor is used for sensing which has negative resistance coffiecient to the temperature.
R 302, 4, 6, 8, 12, C301~C306 are pares for preventing noise.
2) MICOM input voltage, Vf of sensor is Vf=(R+hx x Vcc)/(R301+Rth) (Rth : sensor resistance)

6. KEY SCAN AND DISPLAY PARTS

1) KEY SCAN and display operating

It is used for No 5 of MICoM NO #2, 3, 4, 5, 6,
It operates "high" 10 msec periodically for 2 msec cycle : MICOM pin No : #2
This signal pass by IC 04 (UDN 2981 or KID 65783AP) from Input dot to Dotput dot.
Voltage of peak to peak is about 11V (DC RMS 1.5V)
→ #3 → #4 → #5 → #6
－23－