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Circuit Description - Kenwood RXD-402 Service Manual

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1. Initialization
1-1 Setting of initial conditions
While pressing the [ENTER] key, put the plug into an AC
power outlet.
1-2 Initializing operation
• A microcomputer is initialized for start when the AC
power is turned on when pressing the [ENTER] key. At
that time, CD mechanism and CASSETTE mechanism
are also initialized.
• During the initial operation,the display shows INITIALIZE
and after that it will be returned to STANDBY condition.
1-3 Initial items and back up data
*POWER
*VOLUME
*BALANCE
MUTING
PROTECTION
AMP
S. DIRECT
DISPLAY MODE
*AUTO POWER SAVE
*MD/DVD INPUT LEVEL -3
*INPUT SEL.
*BAND
TUNER *FREQUENCY
*AUTO/MONO
TE
L 13942296513
*P.CH
*CLOCK
CLOCK *PROG. RECORDING
*PROG. TIMER PLAY
SLEEP TIMER
O.T.T.
*DIRECTION
DECK
*RVS MODE
*A/B
*BACKED UP DATA
1-4 Mechanism initialization
1-4-1 CD mechanism
• Disc unclamps(traverse down).
• Rotary tray rotates(1/3 rotation).
• If a mechanism error occurs, CD ERR is indicated on the
display.
1-4-2 DECK mechanism
• When initial condition becomes NG for the third time,
decide the error. The error condition is displayed as X
ERR on the display.
1-4-3 Error display
• If both mechanism (CD/DECK) error occur, the display is
www
indicated as follows. CD & X ERR
.

CIRCUIT DESCRIPTION

ITEMS
STANDBY
14
CENTER
OFF
OFF
OFF
AUTO
OFF
TUNER
FM
LOWEST FREQUENCY
AUTO
--CH
0:00 (E/T/Q) 12:00 (OTHERS)
ON/OFF TIME
0:00 (E/T/Q) 12:00 (OTHERS)
ON/OFF TIME 0:00 (E/T/Q)
12:00 (OTHERS)
OFF
OFF
FORWARD
REVERSE
B
x
ao
u163
y
i
RXD-402/452/502/552/572S/A41/A51
2 9
8
2. Destination list of TUNER
Destinat-
Tuner
BAND
ion
type
FM
K,P
K1
AM
FM
K2
M,V,X,Y
AM
FM
M
K3
MW
SW
FM
M,V,X,Y
E1
AM
FM
MW
M
E3
SW
E1
FM
E
RDS
AM
FM
E2
T
MW
RDS
LW
FML
FMH 87.5MHz~108.0MHz
Q
Q
MW
LW
2-1 Discrimination of TUNER destination
Destina-
R107
tion
[½]
K
91k
Q Q
M1
39k
3
6 7
1 3
1 5
M2
22k
T
13k
E
8.2k
Q
4.7k
3. Test mode
3-1 Test mode of the receiver
3-1-1 Setting of the test mode
While pressing the [INPUT] key or [BAND] key, put the
plug into an AC power outlet.
3-1-2 Canceling of the test mode
Unplug an AC power cord from an AC power outlet.
3-1-3 Condition in test mode
• Power • • • • ON
• EX.BASS • • • OFF
• S.W • • • • • • • OFF
• Selector mode or FL indication
SELECTOR
KEY
MODE
[BAND]
TUNER
+ AC ON
[INPUT]
AUX
co
+ AC ON
.
9 4
2 8
Receiving
Channel
IF
frequency range
space
87.5MHz~108.0MHz
100kHz +10.7MHz
530kHz~1700kHz
10kHz
+450kHz 10kHz
87.5MHz~108.0MHz
100kHz +10.7MHz
530kHz~1610kHz
10kHz
+450kHz 10kHz
87.5MHz~108.0MHz
100kHz +10.7MHz
530kHz~1610kHz
10kHz
+450kHz 10kHz
5.9MHz~17.9MHz
5kHz
+450kHz
87.5MHz~108.0MHz
50kHz +10.7MHz
531kHz~1602kHz
9kHz
+450kHz
87.5MHz~108.0MHz
50kHz +10.7MHz
531kHz~1602kHz
9kHz
+450kHz
5.9MHz~17.9MHz
5kHz
+450kHz
87.5MHz~108.0MHz
50kHz +10.7MHz
531kHz~1602kHz
9kHz
+450kHz
87.5MHz~108.0MHz
50kHz +10.7MHz
531kHz~1602kHz
9kHz
+450kHz
153kHz~279kHz
9kHz
+450kHz
65.0MHz~74.0MHz
10kHz +10.7MHz
50kHz +10.7MHz
531kHz~1602kHz
9kHz
+450kHz
153kHz~279kHz
9kHz
+450kHz
Voltage
AVdd
[V]
10
4.51
3.98
0 5
8
2 9
9 4
2 8
3.44
2.83
R107
2.25
1.60
FL INDICATION
• All the fluorescent display indicators
and LEDs light on.
• STANDBY and TIMER LEDs blink up.
• The all illminated state is cleared by
pressing any main unit keys or
m
remocon keys.
• AUX TEST
9 9
RF
25kHz
25kH
25kHz
5kHz
25kHz
9kHz
25kHz
9kHz
5kHz
25kHz
9kHz
25kHz
9kHz
9kHz
5kHz
5kHz
9kHz
9kHz
X13
9 9
IC1
91pin
(TYPE)
5

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