Kenwood KR-A4020 Service Manual

KR-A4020
iobsiebahc
SERVICE
MANUAL
©1990-3 PRINTED IN JAPAN
B51-4138-00 (S) 3223
Front glass Metallic cabinet Knob (VOLUME CONTROL)
2 2 ‘(A01- 4 = 7
(B10-1076-03)
Panel*
{A01-1832-01)
Knob
(TUNING)
{K29-3597-04)
(K29-3893-04)
Knob (SPEAKER)
Knob
(K27-2006-04)
Knob
(BASS,
TREBLE,
BALANCE)
ees
(K29-3892-03)
(K29-3894-04)
x3
Binding
post
Phono
jack
(2P)
Lock
terminal
board
(8P)
AC
outlet?
AC
power
cord*
(NO8-0128-35)
(E13-0235-05)
(E20-0823-05)
(E03-)
{E03-)
Slide switch
Lock
terminal
board"
Phono
jack
(8P)
Slide
switch
ealsetsi
te)
Power
cord
bushing
(E20-)
(E13-0820-05)
(S31-2136-05)
(J42-0083-05)
* Refer to parts list on page 28.

Kenwood KR-A4020 Specifications

General

Type	Stereo Receiver
Tuning Range	FM, MW
Speaker Impedance	8Ω to 16Ω
Frequency Response	20Hz to 20kHz
Input Sensitivity	2.5mV (MM), 150mV (line)
Signal to Noise Ratio	75dB (MM)
Output	150mV (line)

Summary

Front Panel Controls and Indicators

Front Panel Controls

Identifies and describes the various knobs, switches, and keys on the front panel.

Display Section and Indicators

Details the digital display and status indicators on the front panel.

System Connections

Disassembly and Repair Procedures

Front Panel and Sub-panel Removal

Step-by-step guide for removing the front and sub-panels of the unit.

Main PC Board and Chassis Removal

Instructions for removing the main PC board and the repairing chassis.

Block Diagram

Circuit Description and Analysis

Microprocessor and Key Matrix Connections

Details the microprocessor connections and key input matrix.

Initial Settings and Test Modes

Explains initial setup procedures and how to enter test modes.

Component Functionality and Pinouts

Describes the function of various ICs, pins, and circuit elements.

IC Truth Tables and Logic

Explains the truth tables and logic for key integrated circuits.

Tuning and Adjustment Procedures

Wiring Diagram

Exploded View and Parts Identification

Parts List

Specifications