Switch Unit (X16-16Xx-Xx) - Kenwood KDC-8021 Service Manual

KDC-8021/M9021/X859

SWITCH UNIT (X16-16xx-xx)

Element Purpose & Function
IC1 PANEL u-com
IC2 SPECTRUM ANALYZER IC
IC3 REMOTE CONTROL IC
IC4 BUFFER IC
IC5 3.3V REGULATER
Q1 REMO ON SW
Q2 SC-CON SW
Q3,4 FL+B SW
Q5 FL BLK SW
Q6,7 KEY ILLUMINATION SW
4
COMPONENT DESCRIPTION
It is changed into 3.3V from 5V
The power supply of IC and UFD(Logic) which are driver by 3.3V
The power supply of IC2 and IC3 is turned on when the base level goes "L".
ON when the base level goes "H".
FL+B(VDD2) is turned on when Q3's base level goes "H".
ON when the base level goes "H".
Lights green key-illumination when Q6's base level goes "H".
Lights red key -illumination when Q7's base level goes "H".
Operation, Condition, Compatibility