Kenwood KC 6060 A Service Manual

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WELCOME TO KENWOOD's ALL NEW SOLID STATE CIRCUITRY

Your KENWOOD KC-6060A AUDIO LABORATORY SCOPE :5 part of KENWOOD's
new collection of precrsron engmeered products wrth space age solrd state CerUIIry. Its
superlor performance is the IeSult ol KENWOOD'S engrneers' many years of research In
the Ireld of test Instruments

Your KC-606OA IS a truly professlonal test Instrument that Incorporates all the lunc~
Iuonal Ieatures. such as a large scope and an oscrlIaIOr. reqwred to meet the standard of
prolessronal scepe. KC6060A rs SpeCIaIIy designed to test your FM tuners and amplrlrers
so that you may QIIJOy the best possrble performance for Instenrng pleasure.

Go ahead enJQy it! Y0ur KENWOOD KC-606OA has been made under the most rigrd
qualrty control.

Read this manual carefully before you begun to rnstall your unit. Only by proper

Installatron wrll you be able to enjoy KC-6060A's many extra features.

WARRANTY REGISTRATION

IMPORTANT: Fill Cut your warranty regrstration and mail at at once

TABLE OF CONTENTS

INTRODUCTION ...................................................... I
KC-SOSOA FEATURES ................................................. 2
TYPICAL SET-UP DIAGRAM . . ..

HOW TO CONNECT

FRONT PANEL CONTROLS .......................

OPERATIONAL INFORMATION ..

OPERATION OF SCOPE ..........................

FM MULTIPATH ...................................................... 14
OPERATING HINTS ..............

SPECIFICATIONS ..................................................... 16
MOUNTING TEMPLATE .......................................

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OPERATION O F SCOPE

The Procedure is as Follows:

I) With SELECTOR switch in "STEREO DISPLAY, turn AUDIO
INPUT lever to F RONT".

2) Feed the two signals into front panel AUDIO INPUT terminals. On
the scope screen, trace the horizontal signal to the center, as shown in
Fig. IO (A). Let this amplitude be represented by X.

3) Adjust VERTICAL GAIN control to a proper vertical amplitude, so
that a Lissajous figure will be traced on the screen.

The Lissajous figure can take any of the several shapes illustrated in Fig.

10 (C), depending on the difference in phase angle. The sine of this

angular difference is determined by the formula:

Sin 0 ._x_ where the small x

x 9

included in the Lissajous circle.

is the length of horizontal axis

The angular phase difference so detemtined does not tell which one of the
two signals is leading. However, this question can be answered on the basis
of the phase or frequency characteristic of each channel.

0 ( 0' (90
(0) Relation bemoan liesejous figure and phase angle

V
I . H
M)L-%
V V V
. Jo, K\
Stth bfillipse \JR
line

90.

H

ing

V
0/7 H sin0_§
'x I (B)
V V
Straimt
Ellipw line
H H
go'co'aso' 180'

Fig. 10 Phase angle determination

I BALANCING THE TWO CHANNELS

To balance the stereo channels, proceed as follows:

I) First, balance the vertical and the horizontal sections of the scope
with respect to sensitivity. This is accomplished by feeding the 1 kHz
oscillator output signal to both vertical and horizontal inputs and by
adjusting the respective gains to obtain a 45° linear trace on the
screen, with SELECTOR switch in STEREO DISPLAY" and AUDIO
INPUT lever in FRONT.

2) Secondly, feed the right and left amplifier output signals to the scope
inputs, right and left, and connect the I kHz oscillator output of the
scope to the AUX jack of the amplifier. Turn the MODE switch of
the stereo amplifier to MIX" and adjust the balance control to
obtain a 45° line display on the screen. This balances the two
channels of the stereo amplifier.

CHANNEL SEPARATION MEASUREMENT

For measuring the degree of separation between the two channels in a
stereo amplifier. connect the scope as shown in Fig. ll.

When connecting the amplifier output to KC-6060A audio input, be sure
to connect (+) to (+) and (-) to (-), otherwise you will have the
amplifier damaged.

Here is how you can measure the separation by KC-6060A.

Although the following is how to measure the ratio of cross-talk from left
channel to right channel, you will be able to measure the cross-talk from
right to left by replacing left by right.

lkHz
Left M KC-6060A osc
J /> (-j ' + o o o 9 o
-. l+l 000 o 0 Q
.___fl \
Feed into -) _
one channel at Right Fit]- 11 Testing for
a time channel separation

ll