Circuit Description - Kenwood AR-404 Service Manual

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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. DESTINATION LIST OF TUNER
TUNER
DESTINA-
TYPE
TION
K,P K1(1700)
M,X
M K2(1600)
E
DSW0~DSW3(DIODE SW)
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
• 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 light-
ing 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.
3-4 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.

CIRCUIT DESCRIPTION

RECEIVING
BAND
FREQUENCY
RANGE
FM 87.5MHz~108.0MHz
AM 530kHz~1700kHz
FM 87.5MHz~108.0MHz
E1
AM 531kHz~1602kHz
FM 87.5MHz~108.0MHz
AM 530kHz~1610kHz
E3 FM 87.5MHz~108.0MHz
RDS AM 531kHz~1602kHz
* 0: NONE DIODE,1:ADD DIODE
Digitized in Heiloo Netherlands
AR-404/KRF-A4030/A4030E/A4030-S
(2) TUNER
• BAND ..........................................FM
• PRESET CHANNEL...................."--"
• FREQUENCY..............................LOWER LIMIT VALUE
K1...............................FM:87.50MHz
E1/E3 .........................FM:87.50MHz
• 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.
PLL
CHANNEL
IF
REFERENCE
SPACE
FREQUENCY
100kHz +10.7MHz 25kHz
10kHz +450kHz 10kHz
50kHz +10.7MHz 25kHz
9kHz +450kHz 9kHz
100kHz +10.7MHz 25kHz
10kHz +450kHz 10kHz
50kHz +10.7MHz 25kHz
9kHz +450kHz 9kHz
• 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 CON-
TENTS).
• Channel space will be no changed in the test mode.
3-5 CONTENTS
3-5-1 TUNER FUNCTION
WITH THE SELECTOR ON TUNER (E TYPE ONLY)
OPERATION
FUNCTION
KEY
PTY S LEVEL
RF ATT
DISPLAY P.CALL UP P.CALL FREQUENCY
TA/NEWS PI CODE
3-5-2 AMP FUNCTION
WITH THE SELECTOR ON SOMETHING OTHER THAN
TUNER
• One touch max,min setting for Audio level.
KEY
BAND
AUTO
MEMORY
Bass and treble are selected while the sound key is
pressed.
AM:530kHz
AM:531kHz
DSW3 DSW2 DSW1
(D507) (D505) (D504)
0 0
0 0
0 0
0 1
FL DISPLAY
(EX.)
(1)(SLEVEL), (RF ATT)OFF
(2)(SLEVEL), (RF ATT)ON
(3)(NORMAL), (RF)ATT OFF
PI 0000 PI CODE ON/OFF
SOUND KEY
MASTER VR.
BASS
-89dB 0dB
0dB 0dB
-10dB 0dB
12/11/2017
DSW0
(D510)
0 0
1 1
0 1
0 1
REMARKS
(1)
(2) (3)
CYCLE
-
TREBLE
+10dB
+10dB
+10dB
3