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Kenwood KR-4070 Service Manual

Kenwood KR-4070
23 pages
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KENWOOD
HI/Fl
STEREO
COMPONENTS
KR-4070
(KR-4770)
POWER
2
i:
cay
.
ae
SPEAKERE
eFHoONas
TREBLE
BALANCE
AM-FM
STEREO
RECEIVER

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Kenwood KR-4070 Specifications

Amplifier Section IconAmplifier Section
signal to noise ratio at 65 dBf67 dB
power output (mono)72 dB
power output (stereo)40 watts per channel, minimum RMS at 8 ohms, from 20 Hz to 20, 000 Hz with no more than 0.1% total harmonic distortion
frequency response20 to 15, 000 Hz +0.5 dB, -2.0 dB
capture ratio1.0 dB
both channels driven40 + 40 watts 8 ohms at 1, 000 Hz
dynamic power output190 watts 4 ohms
total harmonic distortion0.1% at rated power into 8 ohms
intermodulation distortion0.1% at rated power into 8 ohms
power bandwidth10 Hz to 40, 000 Hz
damping factor40 at 8 ohms
stereo separation43 dB at 1, 000 Hz
General IconGeneral
power consumption300 watts at full power
dimensions360 mm
weight20.7 lb (9.4 kg)
FM Tuner Section IconFM Tuner Section
usable sensitivity10.8 dBf (1.9 nV)
50 dB quieting sensitivity (mono)15 dBf (3.1 µV)
50 dB quieting sensitivity (stereo)37.2 dBf (40 µV)
AM Tuner Section IconAM Tuner Section
usable sensitivity16 µV
signal to noise ratio50 dB
selectivity34 dB

Summary

Kenwood KR-4070 External View

Internal Components and Maintenance

Internal Component Identification

Identification of internal components and their locations within the receiver.

Dial Cord Stringing Procedure

Step-by-step guide for properly stringing the dial cord on the receiver.

Disassembly and Component Replacement

Panel Assembly Removal

Instructions for removing the front panel assembly and associated components.

Audio Block and Power Transistor Removal

Procedures for removing audio components and power transistors.

Tuner Block and Rotary Wafer Replacement

Guide for removing the tuner block and replacing rotary wafer switches.

Circuit Operation and Repair

Printed Resistor Repair Method

Method for repairing or replacing defective printed resistors on the PC board.

FM Tuner and Muting Circuitry

Explanation of FM tuner operation, muting detection, and MPX circuit.

Stereo Auto Switch and AM Unit Functionality

Functionality of stereo auto switch, VCO control, and AM signal processing.

Audio Circuits and Protection Systems

Description of EQ, tone controls, protection, and noise elimination circuits.

Parts Lists and Identification

Destinations' Parts List

Parts list organized by geographical destination for service.

Component Parts Lists (Capacitors, Resistors, Semiconductors)

Lists of capacitors, resistors, and semiconductors used in the receiver.

Tuner, Audio, and Miscellaneous Parts

Parts for tuner, audio sections, switches, fuses, and miscellaneous components.

Schematics, Technical Data, and Specifications

Tuner and Audio Schematic Diagrams

Schematic diagrams for the tuner and audio units.

Semiconductor Substitutions and Ratings

Guide for semiconductor substitutions and component maximum ratings.

Adjustment and Alignment Procedures

Detailed procedures for receiver adjustments, alignment, and test equipment use.

Receiver Specifications

Performance specifications for amplifier, tuner sections, and general data.

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