Kenwood KAC-8070 - User Manual

KAC'8670 KENWOOD
KENWOOD CORPORATION
SERVICE MANUAL
© 1986-10 PRINTED IN JAPAN
B51-3084-00(B) 3109
Heat sink*
(FO1-)
KAC-8070
KENWOOD
@-CHANNEL POWER AMPLIFIER
Front panel”
(A29-)
Potentiometer
(R29-302 1-08) x2
Connector ass’y (8P)
{£3 1-3964-08)
- REAR
INPUT SENSIFIVITY
i
Rear panel Fuse
Cylindrical receptacle (DIN) (A23-3430-08) (FO5-2038-05)
(EO6-0809-08) x2
Connector ass‘y (4P}
(E31-3963-08)

Summary

Disassembly for Repair

Block Level Diagram

Circuit Description

DC;DC Power Supply Circuit

Explains the DC/DC power supply circuit features and its control IC.

Clock Waveform Comparison

Compares clock waveform characteristics between KAC-7020 and KAC-8070.

Dead Time Control Circuit

Details the dead time control circuit and its components for preventing cross current.

Characteristic Test Circuit and Operational Waveforms

Illustrates the test circuit and operational waveforms for performance evaluation.

Adjustment;Reglage;Abgleich

DC;DC Converter Voltage Adjustment

Procedure for adjusting DC/DC converter voltage and related alignment points.

Idle Current Adjustment

Procedure for adjusting idle current and related alignment points.

PC Board (Component Side)

PC Board (Foil Side)

Exploded View

Parts List

Packing

Specifications

Kenwood KAC-8070 Specifications

Audio Specifications

maximum power output (4 ohms, 1 kHz)	70 W + 70 W
power output (4 ohms, 1 kHz 10% THD)	45 W + 45 W
power output (4 ohms, 20 Hz ~ 30 kHz, 1% THD)	37 W + 37 W
frequency response (-3 dB)	2 Hz ~ 100 kHz
total harmonic distortion (10 W, 1 kHz, 4 ohms)	0.007%
signal to noise ratio (IEC A)	100 dB
sensitivity (rated output)	0.1 V
input impedance	10 kΩ
damping factor (1 kHz)	more than 100

Power

operating voltage	14.4 V (11 ~ 16 V)
current consumption (max)	16 A

Weight and Dimensions

dimensions (W x D x H)	240 x 57 x 170 mm
dimensions (W x D x H) inches	9-7/16 x 2-1/4 x 6-3/4 inches
weight	2.5 kg
weight in pounds	5.5 lb