KENWOOD AR304
Service Manual

AR-304/KRF-A4020
CIRCUIT DESCRIPTION
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) 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.

2. DESTINATION LIST OF TUNER
DESTINA TION K,P M.X M E,T TUNER BAND TYPE K1(1700) E1 K2(1600) E3 RDS FM AM FM AM FM AM RECEIVING FREQUENCY RANGE 87.5MHz~108.0MHz 530kHz~1700kHz 87.5MHz~108.0MHz 531kHz~1602kHz 87.5MHz~108.0MHz 530kHz~1610kHz CHANNEL SPACE 100kHz 10kHz 50kHz 9kHz 100kHz 10kHz +10.7MHz +450kHz +10.7MHz +450kHz +10.7MHz +450kHz +10.7MHz +450kHz +10.7MHz +10.7MHz 450kHz IF PLL DSW3 DSW2 DSW1 DSWO REFERENCE FREQUENCY ( D 5 0 7 ) ( D 5 0 5 ) ( D 5 0 4 ) ( D 5 1 0 ) 25kHz 10kHz 25kHz 9kHz 25kHz 10kHz 25kHz 9kHz 5kHz 5kHz 9kHz 0 0 0 0 0 0 0 1 0 1 0 0 0 1 1 1

FM 87.5MHz~108.0MHz 50kHz AM 531kHz~1602kHz 9kHz FML 65.0MHz~74.0MHz 10kHz Q1 Q RDS FMH 87.5MHz~108MHz 50kHz AM 531kHz~1602kHz 9kHz DSW0~DSW3(DIODE SW) * O: NONE DIODE,1:ADD DIODE

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3. TEST MODE
3-1 SETTING
Turn the power ON while pressing the [BAND] key.

body ,specifically as shown in the following table (3-5 CONTENTS). 4 Channel space will be no changed in the test mode.

3-2 CANCELLATION
Unplug the AC power cord from an AC power wall outlet.

3-5 CONTENTS
3-5-1 TUNER FUNCTION WITH THE SELECTOR ON TUNER (E/T/Q TYPE ONLY)
OPERATION KEY PTY FUNCTION S LEVEL RF ATT DISPLAY BASS BOOST TA/NEWS P.CALL UP P.CALL DOWN PI CODE FL DISPLAY (EX.) (1)(SLEVEL),(RF ATT)OFF (2)(SLEVEL),(RF ATT)ON (3)(NORMAL),(RF)ATT OFF P.CALL FREQUENCY PI 0000 PI CODE ON/OFF REMARKS (1) (2) (3) CYCLE

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.

3-5-2 AMP FUNCTION WITH THE SELECTOR ON SOMETHING OTHER THAN TUNER 1 One touch max,min setting for Audio level. SOUND KEY KEY MASTER VR. BASS TREBLE BAND AUTO MEMORY -89dB 0dB -10dB -10dB +10dB 0dB -10dB +10dB 0dB

3-4 ACTIVE CONTENTS
1 The mute control is not activated when the mode is 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

Bass and treble are selected when the sound key is pressed. 2 Tuned light XS8 XS8/SL16 SWITCH TUNED LIGHTS OFF SL16 TUNED LIGHTS ON

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