Kenwood KT 3050 Service Manual

Page 1

KEN " OD
KT-3050/3050L W0 '

SERVICE MANUAL

Metallic cabinet (A01 296501)

Panel ass'y (A60~)"

Kn by(K294215-04)

- Sub pane! ass'y (ME-157502) Front glass (510-1931-03) Foot (J02-1034-05)

Phono jack (Em-0235.05) _
Power cord bushing 0420083435)

Miniature phone iack
(E1 1 -0188-05)

Lock termina| board (E20-0321-05)
AC power cord (E30-)

Photo is KT-SOSOL.
'Refer to Parts List on page 36.

Page 2

KT-3050/305OL

ACCESSORIES .................................................... 2 3. FIDS operation specification (KT-SOSOL only) .. 13
3.1 RDS overview .............. ..13
CONTROLS AND INDICATORS ............................. 3 3-2 Basic 05 functions ---------- 13
3.3 RDS data format ........................................ 13
BLOCK DIAGRAM ............................................... 5
ADJUSTMENT .................................................... 14
CIRCUIT DESCRIPTION ........................................ 6
REGLAGES ............................................................. 15
1. Microprocessor:
LLPD78043GF-OII (XOSIICIO) .. ABGLEICH ............................................................. 16
1.1 Initial status . .
1.2 Test mode _____ 5 PC BOARD (Component Side View) ....................... 17
1.3 Differences in specification according
to destination and modei. .......................... 7 CIRCUIT DIAGRAM ----- 19
1.4 Block diagram of peripheral circuits of
microprocessor ...................................... 8 EXPLODED VIEW ................................................... 35
1.5 Pin functions ............................................. 9
PARTS LIST ............................................................ 36
2. RDS synchronizing microprocessor:
LC6543H-4600 (XOS:IC12,KT-3050L onw) ....... 11 SPECIFICATIONS ................................................... 49
21 Pin connection diagram ............................. 11
2.2 Synchronizing microprocessor
data format ................................................ 12
FM indoor antenna ...... 1 AM loop antenna ......... 1 75 ohm/300 ohm
antenna adaptor ........... 1

(TSO-OI 76-05)

Loop antenna holder....1

(T90-01 85-05)

Audio cord ................... 1

(J1 9-281 504) (E304 392-05) (E30-0505-05)

AC plug adaptor
(E03-01 15-05) ............. 1
(Except for some areas)

Page 6

KT-3050/3050L

CIRCUIT DESCRIPTION

1. Microprocessor: uPD780436F-011 (X05:IC10)

1.1 Initial Status

(1) Setting method: Hold down the MEMORY key
and plug the tuner in.

(2) Contents:
Port output state

Setting State

1.2 Test Mode

(1) Setting method

Hold down the BAND key and plug the tuner in.
(2) Display

When the power comes on, test mode is entered
and all the flourescent display segments light. The
display segments stay lit until you press a key.

(3) Operation

0 The preset channel definitions with +10 key and
ten keys are different in the test mode. They are

divided into four groups,

(01 ch-10ch/O-ch/--ch): Group1

(11 ch - 20 ch / 1-ch }: Group 2
(21 ch - 30 ch / 2-ch ): Group 3
{31 ch - 39 ch / Bah )2 Group 4

if the current channel is in group 1, the 1 to 9 keys
indicate 01 to 09 channels. 0 key indicates 10
channel. When you are in group 1, it does not
change to another group until you press the +10 key.
That is, you can change the group by pressing the
+10 key. When the current channel belongs to group
1, 1-ch is displayed, and the group changes to
group 2. Group 2 changes group 3 ("2«ch is dis-
played), and group 3 changes to group 4 ("S-ch" is
displayed). Group 4 changes to group 1 Och is
displayed). lf you press the 0 key when "3-ch" is

pcom pin No. Name Output State RAM State All clear
36 POWER Pin Low "n (POWER OFF) Tuning mode AUTO
37 NTUT-E Pin Low n (MUTE ON) Preset channel memory Test irequencv
48 WIDE/NARROW Pin High "-0 (WIDE) L351 band FM
50 MONO Pin Low 0- (OFF) Last frequency Lower most limit of each band
51 AT) Pin Low "n (Attenuator OFF) Last preset channel I: ~ ch.)
53 Reset pin for RDS (mom High m. (reset) Displav mode Frequency display
54 TUNlNG Pin Low
- FL display All lit

displayed, 10ch is recalled. Muting is off in test
mode.

0 Active reception is off in test mode.

You can change between DlRECT and DlSTANCE
with the active reception key. DIRECT is selected
when "ACTlVE RECEPTION on the fluorescent
display lights.

0 AF search takes place roughly every two seconds.
(KT-3050L only)

(4) Clear method

Unplug the tuner.

Page 40

KT-3050/3050L

SPECIFICATIONS

FM tuner section

Reception frequency range.... 87. 5 MHz ~ 108 MHZ
Usable sensitivity (DIN at 759)

MONO ..... 0.8 pV

STEREO ..... 28 (N

Limiting level (DIN at 75 Q) ............................ 0.5 uV
Total harmonic distortion (DIN at 1 kHz)

MONO ................ 0.05 % (85.2 dBf Input) (WIDE)

0.25 % (85.2 dBf input) (NARROW)

STEREO ................ 0.2 % (85.2 dBf input) (WIDE)

Signal to noise ratio (DIN weighted at 1 kHz)

MONO ..... .. 71 dB (85.2 dBf input)

STEREO .. 66 dB (852 dBf input)
Stereo separation (DIN)

1 kHz ............................................. 50 dB (WIDE)

35 dB (NARROW)

6.3 kHz .......................................... 39 dB (WIDE)

Captuer ratio . 2.0 dB (WIDE)

Selectivity (DIN i300 kHz) ..... 55 dB (WIDE)

(DIN i200 kHz) .. 65 dB (NARROW)

Image rejection ratio (at 98 MHz) .. 85 dB

IF rejection ratio (at 98 MHz) .......... 1 10 dB
Spurious reiection ratio (at 98 MHz). 110 dB
AM suppression ratio ........................ .. ,. 70 dB
Sub carrior suppression (DIN) ....... 55 dB (at 19 kHz)

65 dB (at 38 kHz)

Frequency response
(30 Hz ~ 15 kHz) ........................ +0.5 dB, -15 dB

Output level/impedance (FM at 1 kHz, 75 kHz dev.)
Fixed ................................................ 0.8 V/600 Q

KENWOOD follows a policy of continuous advancements in devel-
opment. For this reason specifications may be changed without
notice,

KENWOOD poursuit one politique de progres constants en ce qui
concerne le development. Pour cette raison, les specifications sont
suiettes a modifications sans préavis.

KENWOOD strebt standige, Vebesserungen in der Entwicklung an.
Daher bleiben Anderungen der technichen Daten iederzeit
vorbehalteh.

Note

Component and circuitry are subject to modification to insure best
operation under differing local conditions, This manual is based on
the Europe (E) standard, and provides information on regional circuit
modification through use of alternate schematic diagrams, and in-
formation on regional component variations through use of parts list.

MW tuner section

Reception frequency range ...... 531 kHz ~ 1,602 kHz
Usable sensitivity .......................... 15 uV/(AOO uV/m)
Signal to noise ratio

(at 30 % mod. 1 mV input) ....................... 50 dB
Total harmonic distortion .. 0.3 %

Image rejection ratio 30 dB

Selectivity .................... 30 dB
Output level/ impedance

(at 30 % mod. 1mV input) ,- ............ 0.24 V/6OO Q
LW tuner section
Reception frequency range ......... 153 kHz ~ 279 kHz
Usable sensitivity ............................................ 20 IN
Signal to noise ratio

(at 30 % mod. 1 mV input) ....................... 48 dB

.. 0.5 °/o

Total harmonic distortion .. .
.. 27 dB

Image rejection ratio .......... .
Selectivity ........................................................ 35 dB
Output level/impedance

(at 30 % mod. 1mV input) ............. 0.24 V/BOO 0
General

.......................... 12W

Power consumption .....

Dimensions .................. .W: 440 mm (17 - 5/16")
H: 98mm(3-7/8")
D: 283 mm (11 -1/8')
Weight (net) ......................................... 3,1 kg (6.8 lb)

KENWOOD CORPORATION

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