9-6) Key Scan And Display Circuit - M2 MC2125PALS Service Manual

Circuit Descriptions

9-6) 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) 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 IC5 (TD
62783AP), then approximate 11V peaks will generate from
an output terminal as shown on the next page.
42
Power Freeze
Freezer Temp.
Ice Type
Power Cool
Fridge Temp.
Child Lock