KENWOOD AR404
Service Manual

AR-404/KRF-A4030/A4030E/A4030-S
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 � SOURCE DIRECT.......................OFF � TAPE2/MONITOR .......................OFF (2) TUNER � BAND ..........................................FM � PRESET CHANNEL...................."--" � FREQUENCY..............................LOWER LIMIT VALUE K1...............................FM:87.50MHz AM:530kHz E1/E3 .........................FM:87.50MHz 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
TUNER DESTINATION K,P M,X M E TYPE K1(1700) E1 K2(1600) E3 RDS BAND FM AM 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 87.5MHz~108.0MHz 531kHz~1602kHz CHANNEL SPACE 100kHz 10kHz 50kHz 9kHz 100kHz 10kHz 50kHz 9kHz IF +10.7MHz +450kHz +10.7MHz +450kHz +10.7MHz +450kHz +10.7MHz +450kHz PLL DSW3 DSW2 DSW1 DSW0 REFERENCE (D507) (D505) (D504) (D510) FREQUENCY 25kHz 10kHz 25kHz 9kHz 25kHz 10kHz 25kHz 9kHz 0 0 0 0 0 0 0 1 0 1 0 0 0 1 1 1

DSW0~DSW3(DIODE SW)

* 0: NONE DIODE,1:ADD DIODE

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

� During the test mode, it can be operated in a special manner that is deferent from an ordinary operation by using the keys on the remote control or the main body ,specifically as shown in the following table (3-5 CONTENTS). � Channel space will be no changed in the test mode.

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

3-3 STARTING ACTIVE CONTENTS
� The power on state is entered whenever the power is trued on while pressing the [BAND] key. � All functions are initialized and activated in the all lighting mode. � 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. � E2PROM check(Etype 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 CONTENTS
3-5-1 TUNER FUNCTION WITH THE SELECTOR ON TUNER (E TYPE ONLY)
OPERATION KEY FUNCTION PTY DISPLAY TA/NEWS S LEVEL RF ATT FL DISPLAY REMARKS

(EX.) (1) (1)(SLEVEL), (RF ATT)OFF (2)(SLEVEL), (RF ATT)ON (2) (3) (3)(NORMAL), (RF)ATT OFF CYCLE P.CALL UP P.CALL FREQUENCY PI CODE PI 0000 PI CODE ON/OFF

3-4 ACTIVE CONTENTS
� The mute control is not activated when the mode is switched. � The test mode will be terminated by plugging it off the power source or by initializing it when all the settings will be initialized.

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

Bass and treble are selected while the sound key is pressed.

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