Samsung R21 Specifications download pdf (Page 46)

Circuit Descriptions

10-6) Key Scan and Display Circuit

Power Freeze

Freezer Temp.

Ice Type

Power Cool

Fridge Temp.

Child Lock

1) Key Scan and display operation.

The model uses a decorder IC which 4 inputs and 9 outputs.

If the IC 9 decorder (TC4028BP) receivesd 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

PCB and IC5 (TD

62783AP), then approximate 11V peaks will generate from an

output terminal as shown on the next page.

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 97 98

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Samsung R21 Specifications Page 46