Kenwood KR-4070 Service Manual

KR-4070
CONTENTS
EXTERNAL VIEW 355, cool cctiagies wads sats candi ila v ada dugte bhatt ane cane deal anus Salar wanesens 3
INTERNAL’ VIEW os deco iisetec teil N cn ie am Nene, tuuhadauntic Adoniecre eat aatinie ehlattie manne aaobvs 4
DIAL CORD STRINGING oot ee teste te estes ectereeeeeeeeeeeeeneneeees 4
DISASSEMBLY FOR REPAIR 00.0 ccc e eect eect eee e bbc bccntebttetrerenenvenes 5
CIRCUIT DESCRIPTIONS 2. oi secct eure. | Som digi eal cen eh teen aah meen aaeceees 7
DESTINATIONS’
PARTS
LIST...
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12
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PC BOARD
TUNER MXO5= 14:70:10) Hotes sdcrsceretdaaste (shes ells aarhnis gn yMlddan cldeinantaduands vauatdetutes 16
AUDIOAXO921:220210): ccrtenan. 2: ots thes ae diaetalnen nee ye estiaes doen edie hy wedutiee Sl yey, 17
SEMICONDUCTOR
SUBSTITUTIONS
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18
ADI USTMEN Tiere: Sethu acer dada ttt Be be Pecniet a Seagate te hed eased ct yeaa sabes rea atea 19
SCHEMATIC DIAGRAM... ccc cect tet t tebe ttn cbtateteerttrvtneeieesertes 22
SPECIFICATIONS
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23
Products for PX (U type) are
provided with Cabinet as
photo.
"Note
1:
.
coe
tey
; :
TPA
oe
fe
Ne
The
products
are
subject
to
modification
in
components
and,
circuits
in”
feos
different
countries
and
regions.
This
is
because
each
product
must
be
used
-
under
the
best
condition.
This
manual
provides
information
of
modification
based
on
the
standard
in
the
U.S.,
for
the
convenience
of
ordering
associated
components
and
parts.
US Al siinsegtie hapeeipaalagd. ecco nee eases 5 Be haseerydaccates K
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SCANGINAVI G0 ace svcevcc ds beded ven; cas bedlecaubesuvveeacaatesannoeweceteds L
Other areas sie aay, cs a aiden aadsdaa cca tvsstadues Neasvavccks M
AUGIO: ClUD 3.55.5 .censcicdesidcand seth taesaitencuer i seenitenslachicn gbatieey M2 (KR-4770)
Note 2:
Symbol + in parts list means the new parts.

Kenwood KR-4070 Specifications

Amplifier Section

signal to noise ratio at 65 dBf	67 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 response	20 to 15, 000 Hz +0.5 dB, -2.0 dB
capture ratio	1.0 dB
both channels driven	40 + 40 watts 8 ohms at 1, 000 Hz
dynamic power output	190 watts 4 ohms
total harmonic distortion	0.1% at rated power into 8 ohms
intermodulation distortion	0.1% at rated power into 8 ohms
power bandwidth	10 Hz to 40, 000 Hz
damping factor	40 at 8 ohms
stereo separation	43 dB at 1, 000 Hz

General

power consumption	300 watts at full power
dimensions	360 mm
weight	20.7 lb (9.4 kg)

FM Tuner Section

usable sensitivity	10.8 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

usable sensitivity	16 µV
signal to noise ratio	50 dB
selectivity	34 dB