Kenwood KA-770D Service Manual

STEREO INTEGLATED AMPLIFIER
A-770D
SERVICE MANUAL
C1987-7 PRINTED IN JAPAN
B51-3275-00(T)2227
Panel ass'y Knob (Button) Knob
(A20-5303-03) (K29-2684-04) x 5 (K29-2689-04}
Knob ass’y (Button) Metallic cabinet © Knob (Button)
mane
(K29-2687-14)
x3
(AQ1-1553-01)
(K29-2727-04)
(K29-1822-04) x 2
KENWOOD erewe wrajmarac semen 14-770)
Knobass’y (Button)
(K29-2687-14)x2
Knob ass’y (Button) Phone jack
(K29-2724-04) (E11-0174-05)
Knob Knob ass‘y (Button)
(K29-2077-03) x 3 (K29-2685-14) x4
Phono jack (6P)
(E13-0630-05) x 3
AC outlet*
Binding post
Powe cord bushing
(NO8-O 128-35)
(J4240 83-05)
Foot*
(JO2-) x 4 Slide switch*
($31-2083-05)
AC ower cord*
Phono
jack
(2P)
(E3¢)
(E13-0235-05}
Screw
terminal
board
({E20-)
* Refer to parts list page 26.

Kenwood KA-770D Specifications

Power

power output per channel	80 W
maximum continuous power output	120 W
dynamic power per channel at 4 ohms	190 W
power consumption	260 W

Audio Performance

total harmonic distortion at 8 ohms	0.055%
intermodulation distortion	0.055%
damping factor	600

Input/Output Specifications

input sensitivity/impedance phono (MM)	2.6 mV/47 kohms
input sensitivity/impedance phono (MC)	0.2 mV/100 ohms
output level/impedance tape rec	150 mV/220 ohms

Signal to Noise Ratio

signal to noise ratio phono (MM)	86 dB
signal to noise ratio phono (MC)	66 dB
signal to noise ratio tuner/aux/tape	108 dB

Dimensions and Weight

width	440 mm
height	143 mm
depth	343 mm
weight	9.2 kg

Summary

Disassembly for Repair

Front Panel and Sub Panel Removal

Steps to remove the front panel and sub panel assembly.

Bottom Plate Removal

Steps to remove the bottom plate from the chassis.

Rear Panel and Sub-Circuit Unit Removal

Steps to remove the rear panel and sub-circuit unit.

Block & Level Diagram

Circuit Description

Component Function Details

Explains functions of various components within the unit.

Specific Circuit Operations

Details operations of REC OUT and Headphone circuits.

Adjustment and Calibration

Idle Current and Alignment

Procedures for setting idle current and alignment points.

Voltage and Current Measurements

Covers reglages and abgleich for operational checks.

Voltage Tables

PC Board Diagrams

Component Side View

Diagram showing component placement on the PC board.

Foil Side View

Diagram showing the foil layout of the PC board.

Schematic Diagrams

Exploded View

Parts List

Specifications