Components Description - Kenwood KDC-8024 Service Manual

KDC-8024
SUB-CIRCUIT UNIT (X16-2080-10)
Ref. No. Application/Function
IC1 E2PROM
SUB-CIRCUIT UNIT (X16-2120-10)
Ref. No. Application/Function
IC1 3.3V regulator
IC2 Buffer IC
IC3 Remote control IC
IC4 Spectrum analyzer IC
Panel µ-com
IC5
Q1, 2 FL+B SW
Q3 REMO ON SW
Q4 FL BLK SW
Q5 Blue LED SW
SWITCH UNIT (X16-2170-10)
Ref. No. Application/Function
Q1 DSI (Disabled System Indicator)
Q2 KEY illumination SW (GREEN)
Q3 KEY illumination SW (RED)
ELECTRIC UNIT (X25-9642-72)
Ref. No. Application/Function
System µ-com
IC1
IC2 E-vol & N.C. & MPX
IC3 Regulator IC for A8V
IC4 Power IC
IC5 System E's IC
IC6 Audio IC (WOW)
IC8 Reset IC
IC9 Logic IC for muting
IC10 Buffer for S.A
IC14 RDS dcoder IC
IC15, 16 Motor driver IC for panel mechanism
IC17 ROM IC
IC18 P-CON IC
IC20 Analog SW for swiching IC6'focus
Q1, 2 B.U.5V AVR
Q3, 601 SW5V
Q4, 5 SW14V
Q6~8 AUDIO 8V AVR
Q9, 602 SERVO+B AVR
Q11~14 ILL&DC/DC+B AVR
Q25 Ex amp control buffer
4

COMPONENTS DESCRIPTION

For security
The power supply of IC and VFD (Logic) which are driven by 3.3V
It is change into 3.3V from 5V
FL+B (VDD2) is turned on when Q2's base level goes "H"
The power supply of IC2 and IC3 is turned on when Q3's base level goes "L"
VFD is turned on when Q4's base level goes "H"
Blue LED is turned on when Q5's base level goes "H"
DSI blinks when the base goes "H/L"
ON (KEY illumination green) when the base goes "H"
ON (KEY illumination red) when the base goes "H"
For ROM correction.
While BU is applied, BU5V AVR outputs +5V.
When Q601'base goes Hi, SW5V outputs +5V.
When Q5'base goes Hi, SW14V outputs 14V.
When Q6'base goes Hi, A8V AVR outputs 8.3V.
When Q602'base goes Hi, S+B AVR outputs 7.5V.
When Q11'base goes Hi, AVR outputs 9.2V.
Operation/Condition/Compatibility
Operation/Condition/Compatibility
Operation/Condition/Compatibility
Operation/Condition/Compatibility