Kenwood VR 357 Service Manual

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KRF-V7020DN8020D/VR-307/309/357

CONTENTS / ACCESSORIES / CAUTIONS

Contents
CONTENTS / ACCESSORIES / CAUTIONS ..... ....2 WIRING DIAGRAM ......
DISASSEMBLY FOR REPAIR ...... 3 PC BOARD .....
CONTROLS .............. 4 SCHEMATIC D
BLOCK DIAGRAM 6 EXPLODED VIEW
CIRCUIT DESCRIPTION ....7 PARTS LIST ..............
ADJUSTMENT .......................................................... 14 SPECIFICATIONS ..................................................... 45
Accessories
f N
FM indoor antenna (1) r- AM loop antenna (1) - l Batteries (Rog/AAA) (4)
(T90-0836-05) i (T90-0833-05) Loop antenna and (1) I
i l o,
® *
: \ . l
l l
Remote control unit(1) Remote control unit(1) AC plug adaptor (I)
RC-R0508/R0608 RC-R0712 (E03'0115'05)
« , Use to adapt the
sci/VQOOOOCIOOG I" plug on the power
""020é400(9>2«%882 cord to the shape
7 V of the wall outlet.
Battery cover (A09-0366-08) Battery cover (A09-1123-08) (Accessoryonly for regions where use
is necessary.)
\ J
(3
Model name vs remote controller
Remote Controller
Model Destinations Parts number Model name Battery Cover
KRF- V70200 X7,C7,Y7,V7,M7 A70-1268-05 RC-RO712 A09-1123-O8
KRF- V8OZOD X8 A70-1275-05 RC-R0508 A09-0366-08
KFIF- VBOZOD C8, |8,Y8,M8 A70-1277-05 RC-R0608 A09-0366-08
VR-30 7 K6, P6 A70-1268-05 RC-RO712 A09-1123-O8
VR-309 K8, P8 A70-1277-05 RC-R0608 A09-0366-08
VR-357 K7, P7 A70-1277-05 RC-R0608 A09-O366-O8
Cautions

Resetting the Microcomputer

If the microcomputer may malfunction (unit cannot be operated,
or shows an erroneous display) if the power cord is unplugged
while the power is ON, or due to some other external factor. If this
happens, execute the following procedure to reset the micro-
computer and return the unit to its normal operating condition.

For U.S.A. and Canada

Unplug the power cord from the wall outlet, then plug it
back in while holding down the POWER key.

For other countries

With the power cord plugged in, turn the POWER key
OFF. Then, while holding down the ON/STANDBY key,
press POWER.

- Please note that resetting the microcomputer will clear the contents
oi the memory and returns the unit to the state it was in when it left the
factory.

#

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KRF-V7020DN8020D/VR-307/309/357

SPECIFICATIONS

For U. S.AandCanada

AUDIOsecIian
Rated power output during STEREO operation

100 watts per channel minimum RMS, both channels driven, at
3 Q from 40 Hz to 20 kHz with no more than 0.7% total harmonic
distortion.(FTC)

Effective power output during SURROUND operation
FRONT (1kHz, 0. 7% T. H. D. at 8 (2 one channel driven)
00 W 4- 100 W
one c anne driven)

.. 100 W
SURROUND (1kHz, 0. 7% T H. D. at S (2 one channel driven)
00 W + 100 W

Total harmonic distortion
Frequency response

0.03% (1 kHz, 50w, 3 r2)

10 HZ ~ 85kHz, +0 dB, -3.0 dB

Signal to noIse ra Io (
PHONO (MM)
CD

v
PHONO (MM)

. 200 mV / 47 k5)

CD ......

Output level / impedance
TAPE REC 200 mV / 2.2 k5)
PRE OUT (S ...2 V I 2.2 k!)

Tone control
:10 dB (at 100 Hz)
:10 dB (at 10 kHz)

DIGITAL AUDIO section

Sampling frequency...
Input level I impedance I" wave miength

..... 32 kHz, 44.1 kHz, 48 kHz

FM tuner section

Tuning frequency range......
' ty (MONO)

. 1.6 uv (75 ml 15. 2 dBt (75 kHz DEV., SINAD no dB)

5DdB qu ting sensitivity

87.5 MHz - 108 MHz

STEREO. 31.5 UV (75 Q)/ 41.2 dBt
Total harmonic stortIon (1 kHz)

MONO ..... 0.6% (65 1131 input)

STEREO. 0.7% (65 dBI input)
Signal to noise ratIo (1 kHz, 75 kHz DEV.)

MONO 75 dB (55 dBi input)

STEREO.
Stereo separa on (1 kHz)
Selectivity (:400 kHz)
Frequency response .

68 dB (65 dBf input)
35 dB
50 dB
30 HZ ~ 15kHz, +0.5 (13, -3.0 dB

AM funerseclion

Tuning frequency range
10 kHz step

......530 kHz - 1,700 kHz
Usable sens ity (30% mo S/N 20 dB)

..16 IN" / (500 uV/m)

Signal to no e ratio (30% mod. 1 m ..50 dB
GENERAL
Power consumption ..... 2.6 A

AC outlet
SWITCHED
Dimensions

2 (total 150 W, 1.25 A max.)
w : 440 mm (17-5/15")

H :144 mm (5-11/16")

o : 400 mm (15-3/4")
...8.6 kg (19.0 lb)

Weight (Net) .....

Optical -15 dBm ~ -21 dBm, 600 nm iSOnm
Coaxial 0.5 Vp-p / 75 51
VIDEO section
VlDEOinputs/outputs
VIDEO (composite) ............................ 1 Vp-p/ 75 Q
5 VIDEO (Iuminancesignal).. 1 Vp-p/ 75 t2
(chmminancesignal) . 0.286 Vp-p/ 75 9
Notes

1. KENWOOD follows a policy of continuous advancements in development. For this reason specifications may be changed without notice.
2. The full performance may not be exhibited in an extremely cold location (under a waterrfreezing temperature).

Note:

Component and circuit are subject to modification to insure best operation under differing local conditions. This manual is based on General
market(M) standard, and provides information on regional circuit modification through use of alternate schematic diagrams, and information on

regional component variations through use of parts list.

KENWOOD CORPORATION

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