Samsung RS265BBWP Service Manual page 87

11. CIRCUIT DESCRIPTIONS
12-6) Key Scan and Display Circuit
1) Key Scan and display operation.
The model uses a decorder IC which 4 inputs and 9 outputs.
If the IC 9 decorder (TC4028BP) received signals from
MICOM pins (3∼6), an output signal per 2 miliseconds
comes out from Q3, Q41, Q8, Q6, Q9, Q7, Q0, Q2, and Q4
pin in sequence. This signal enters to a driver IC input
terminal of the CoolSelect Zone TM PCB and IC5 (TD
62783AP), then approximate 11V peaks will generate from
an output terminal as shown on the next page.
88