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－23－
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)
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
→ #3 → #4 → #5 → #6
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)
5. TEMP·SENSING PART
6. KEY SCAN AND DISPLAY PARTS