Circuit Description; Test Mode - Kenwood AR-304 Service Manual

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
BAND
TION TYPE
FM
K,P K1(1700)
AM
FM
M.X E1
AM
FM
M K2(1600)
AM
E3 FM
E,T
RDS AM
FML
Q1
Q FMH
RDS
AM
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
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
CHANNEL
FREQUENCY
S P A C E
RANGE
87.5MHz~108.0MHz 100kHz
530kHz~1700kHz 10kHz
87.5MHz~108.0MHz 50kHz
531kHz~1602kHz 9kHz
87.5MHz~108.0MHz 100kHz
530kHz~1610kHz 10kHz
87.5MHz~108.0MHz 50kHz
531kHz~1602kHz 9kHz
65.0MHz~74.0MHz 10kHz
87.5MHz~108MHz 50kHz
531kHz~1602kHz 9kHz
AR-304/KRF-A4020
(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.
PLL
D S W 3
I F REFERENCE
( D 5 0 7 )
FREQUENCY
+10.7MHz 25kHz
+450kHz 10kHz
+10.7MHz 25kHz
+450kHz 9kHz
+10.7MHz 25kHz
+450kHz 10kHz
+10.7MHz 25kHz
+450kHz 9kHz
+10.7MHz 5kHz
+10.7MHz 5kHz
450kHz 9kHz
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 FUNCTION
PTY
S LEVEL
RF ATT
DISPLAY P.CALL UP
BASS BOOST P.CALL DOWN
TA/NEWS PI CODE
3-5-2 AMP FUNCTION
WITH THE SELECTOR ON SOMETHING OTHER THAN
TUNER
1 One touch max,min setting for Audio level.
KEY MASTER VR.
BAND -89dB
AUTO 0dB
MEMORY -10dB
Bass and treble are selected when the sound key is
pressed.
2 Tuned light
XS8
XS8/SL16 TUNED LIGHTS
SWITCH OFF
D S W 2 D S W 1 D S W O
( D 5 0 5 ) ( D 5 0 4 ) ( D 5 1 0 )
0 0 0 0
0 0 1 1
0 0 0 1
0 1 0 1
1 0 1 1
FL DISPLAY REMARKS
(EX.)
(1)
(1)(SLEVEL),(RF ATT)OFF
(2) (3)
(2)(SLEVEL),(RF ATT)ON
CYCLE
(3)(NORMAL),(RF)ATT OFF
P.CALL FREQUENCY
PI 0000 PI CODE ON/OFF
SOUND KEY
BASS TREBLE
-10dB -10dB
+10dB +10dB
0dB 0dB
SL16
TUNED LIGHTS
ON
3