Circuit Description - Kenwood AR-304 Service Manual

QQ
3 7 63 1515 0
1. BACK UP DATA AND INITIAL STATE
1-1 BACK UP
(1) AMP
• POWER................................STANDBY
• INPUT SELECTOR ..............TUNER
• BALANCE ............................CENTER
• SPEAKER A RELAY ............ON
• SPEAKER B RELAY ............OFF
• VOLUME LEVEL.................-66dB
• BASS LEVEL .......................0dB
• TREBLE LEVEL ...................0dB
• INPUT LEVEL ......................0dB
• BASS BOOST ......................OFF
• SOURCE DIRECT ...............OFF
• TAPE2/MONITOR................OFF
• SL16/XS8 .............................SL16
2. DESTINATION LIST OF TUNER
DESTINA TUNER
TION TYPE
K,P K1(1700)
M.X E1
M K2(1600)
E3
E,T
RDS
TE
L 13942296513
Q1
Q
RDS
DSW0~DSW3(DIODE SW) * O: NONE DIODE,1:ADD DIODE
3. TEST MODE
3-1 SETTING
Turn the power ON while pressing the [BAND] key.
3-2 CANCELLATION
Unplug the AC power cord from an AC power wall outlet.
3-3 STARTING ACTIVE CONTENTS
1 The power on state is entered when the power is
tuned on while pressing the [BAND] key.
All functions are initialized and activated in the all
lighting mode.
2 All lighting mode is canceled when any main unit's
keys are pressed. The normal display obtained when
the selector is set to TUNER then appears.
3 E2PROM check(E,T,Q,type only).
Check the reading data and the writing data of the
E2PROM after setting the test mode.
Display shows blank if the reading data and writing
data are the same. Display shows "LW" if the different
data will be written to E2PROM.
3-4 ACTIVE CONTENTS
1 The mute control is not activated when the mode is
www
switched.
2 The test mode will be terminated by plugging it off the
power source or by initializing it when all the settings
will be initialized.
.
3 During the test mode, it can be operated in a special
manner that is different from an ordinary operation by
using the keys on the remote control or the main

CIRCUIT DESCRIPTION

RECEIVING
BAND FREQUENCY
RANGE
FM 87.5MHz~108.0MHz
AM 530kHz~1700kHz
FM 87.5MHz~108.0MHz
AM 531kHz~1602kHz
FM 87.5MHz~108.0MHz
AM 530kHz~1610kHz
FM 87.5MHz~108.0MHz
AM 531kHz~1602kHz
FML 65.0MHz~74.0MHz
FMH 87.5MHz~108MHz
AM 531kHz~1602kHz
x ao u163
y
i
AR-304/KRF-A4020
2 9
8
(2) TUNER
• BAND ...................................FM
• PRESET CHANNEL............."- - "
• FREQUENCY.......................LOWER LIMIT VALUE
K1 .................................FM:87.50MHz/AM:530kHz
E1/E3 ............................FM:87.50MHz/AM:531kHz
Q1 .................................FM:65.00MHz/AM:531kHz
• AUTO/MANUAL ...................AUTO
• DISPLAY MODE ..................FREQUENCY
• E ON THRUST RECEIVING ...........OFF
MODE
• T1 VOLUME.........................OFF(-66dB)
1-2 INITIAL SETTING
The initial setting is performed when the AC power cord
is plugged into the AC power wall out let while pressing
the power (STANDBY) key.
CHANNEL
I F REFERENCE
S P A C E
FREQUENCY
100kHz +10.7MHz 25kHz
10kHz +450kHz 10kHz
50kHz +10.7MHz 25kHz
9kHz +450kHz
100kHz +10.7MHz 25kHz
10kHz +450kHz 10kHz
50kHz +10.7MHz 25kHz
9kHz +450kHz
Q Q
3 6 7 1 3
10kHz +10.7MHz
50kHz +10.7MHz
9kHz 450kHz
body ,specifically as shown in the following table (3-5
CONTENTS).
4 Channel space will be no changed in the test mode.
3-5 CONTENTS
3-5-1 TUNER FUNCTION
WITH THE SELECTOR ON TUNER (E/T/Q TYPE ONLY)
OPERATION KEY
PTY
DISPLAY
BASS BOOST
TA/NEWS
3-5-2 AMP FUNCTION
WITH THE SELECTOR ON SOMETHING OTHER THAN
TUNER
1 One touch max,min setting for Audio level.
KEY
BAND
AUTO
MEMORY
Bass and treble are selected when the sound key is
pressed.
2 Tuned light
.
XS8/SL16
SWITCH
9 4 2 8
PLL
D S W 3 D S W 2
( D 5 0 7 ) ( D 5 0 5 ) ( D 5 0 4 )
0 0
0 0
9kHz
0 0
0 1
9kHz
1 5 0 5 8 2 9 9 4
5kHz
5kHz 1 0
9kHz
FUNCTION FL DISPLAY
(EX.)
S LEVEL (1)(SLEVEL),(RF ATT)OFF
RF ATT (2)(SLEVEL),(RF ATT)ON
(3)(NORMAL),(RF)ATT OFF
P.CALL UP
P.CALL DOWN P.CALL FREQUENCY
PI CODE PI 0000
SOUND KEY
MASTER VR.
BASS
-89dB -10dB
0dB +10dB
m
-10dB 0dB
co
XS8
TUNED LIGHTS TUNED LIGHTS
OFF
9 9
D S W 1 D S W O
( D 5 1 0 )
0 0
1 1
0 1
0 1
2 8 9 9
1 1
REMARKS
(1)
(2) (3)
CYCLE
PI CODE ON/OFF
TREBLE
-10dB
+10dB
0dB
SL16
ON
3