KENWOOD KRC-4902Y Service Manual

Cover page of KENWOOD KRC-4902Y Service Manual

Service Manual for KENWOOD KRC-4902Y, downloadable as a PDF file.

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© 2002-1 PRINTED IN JAPAN
B51-7880-00 (N) 1089
CASSETTE RECEIVER
KRC-4902Y
SERVICE MANUAL
Mounting hardware assy
(J21-9641-13)
Antenna adaptor
(T90-0523-05)
Lever
(D10-4589-04)
DC cord
(E30-4792-05)
Plastic cabinet assy
(A02-1486-13)
LOUD
SCRL
SCAN
REP
M.RDM
T.CALL
B.S/RDM
MENU
AME
AUTO
CLK
KRC-4902
SRC
OFF
45Wx4
WIDE BAND
DISC
AUD
Front glass
(B10-4129-01)
Knob(1-6)
(K25-1392-03)
Knob(SRC)
(K24-3820-04)
Knob(FM,AM)
(K25-1393-03)
Knob(VOL)
(K25-1395-03)
Cassette lid
(A53-1687-03)
Panel assy
(A64-2540-02)
Knob(AUD)
(K24-3821-04)
MECHANISM EXTENSION CORD
W05-0477-00 (7P)
W05-0609-00 (10P)
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© 2002-1 PRINTED IN JAPAN
B51-7880-00 (N) 1089
CASSETTE RECEIVER
KRC-4902Y
SERVICE MANUAL
Mounting hardware assy
(J21-9641-13)
Antenna adaptor
(T90-0523-05)
Lever
(D10-4589-04)
DC cord
(E30-4792-05)
Plastic cabinet assy
(A02-1486-13)
LOUD
SCRL
SCAN
REP
M.RDM
T.CALL
B.S/RDM
MENU
AME
AUTO
CLK
KRC-4902
SRC
OFF
45Wx4
WIDE BAND
DISC
AUD
Front glass
(B10-4129-01)
Knob(1-6)
(K25-1392-03)
Knob(SRC)
(K24-3820-04)
Knob(FM,AM)
(K25-1393-03)
Knob(VOL)
(K25-1395-03)
Cassette lid
(A53-1687-03)
Panel assy
(A64-2540-02)
Knob(AUD)
(K24-3821-04)
MECHANISM EXTENSION CORD
W05-0477-00 (7P)
W05-0609-00 (10P)
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KRC-4902Y
2
BLOCK
DIAGRAM
FM ANT
AM ANT
RF GND
FM+B
AM+B
AM LO/DX
FM LO/DX
IF SELECT
RDS OUT
FM SD OUT
REQUEST
K2I-VTH
VCO-GND
FSD OUT
FM DET OUT
AM DET OUT
IF GND
COMMON+B
P-ON 5V
DIG GND
PLL DATA
PLL CLK
PLL CE
HI UP ADJ
FM+B
AM+B
A8V
SW5V
LO/DX
SD
S-METER
PLL-DATA
PLL-CE
SW5V
ACC-DET
BU-DET
SCL
MUTE
SDA
EN1
EN2
EN3
P
ANEL
RESET
DSI
CH
MUTE
NOISE
D
ATA
H
D
ATA
C
REQ
H
REQ
C
CH
RST
CH
CON
CH
CLK
Rch
COM
Lch
TAPE L/R
MP IN
AFS
QUAL
AM
MPX
OUT RR
OUT LR
OUT RF
LEVEL
SCL
SW5V
SDA
SCL
SD
A
OUT LF
STBY
MUTE
SMUTE
5
10
BU5V
AFS
R QUAL
R CLK
R DATA
BU5V
REMO
SW5V
GREEN
RED
BU5V
PHONE
BEEP
SVR
P-MUTE
P-STBY
SVR
AC GND(BEEP)
T
APE
L/R
PLL-CLK
L-RES
L-CLK
L-D
A
T
A
S
L-D
A
T
A
L
MUSIC
EQ-MUTE
MS-CONT
MUSIC
EQ-MUTE
MS-CONT
FWD/REV
P
A
CK
IN
M-STBY
T
-MODE
T
-END
L-CE
340mV
SUB+
SUB-
Rch
Lch
PACK
T-END
M-STBY
T-MODE
FWD
REV
AUDIO
8V
MOTOR
BU14V
SW5V
IN
PLAY HEAD
SW5V
BU14V
BU5V
BU14V
EN1
EN2
EN3
P,CON
ILLUM
B.U.5V
AM+B
AUDIO
FM+B
FM+B
AM+B
AUDIO 8V
AUDIO 8V
AUDIO 8V
BU5V
SW5V
TAPE
CD-CH
AM
FM
: 1719mV
: 3424mV
: 550mV
: 1727mV
TAPE
CD-CH
AM
FM
: 1786mV
: 3546mV
: 850mV
: 1345mV
AM : 160mV
FM : 213mV
CD L/R
1200mV
BU14V
CD L/R
8
ANT.
SYSTEM u-COM
KEY
PAN 5V
MUTE
E2PROM
EQ AMP
CD ISO AMP
E-VOL
LCD DRIVER
LCD
DSI
REMO
RST SW
PAN IN SW
GREEN
RED or
RST IC
TEL DET
TEL MUTE
DRIVER
MAIN
SUB
AVR
SW5
B.U. DET
SURGE-DET
B.U.
ACC
P-CONT
DC CONNECTOR
REGULATOR
ACC DET
J2
VOLTAGE
MUTE
PRE
R-Lch
R-Rch
AMP
SVR
MUTE
THERMO
PROTECTION
FRONT Lch
FRONT Rch
REAR Lch
REAR Rch
IC4
J4
POWER IC
TDA7386
CD/MD
CHANGER
SP OUT
J5
PRE OUT
IC10
SUB MOTOR
DRIVER
MOTOR
DRIVER
IC1
IC2
IC12
IC9
IC2
IC1
IC11
IC7
IC8
Q2,3
TUNER
(X16)
(X14)
M
M
TAPE MECHA
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KRC-4902Y
3
q SYNTHESIZER UNIT (X14-6892-72)
COMPONENTS DESCRIPTION
Ref.No.
Function
Operation
IC1
SYSTEM
µ-COM
IC2
E-VOLUME
IC4
POWER AMPLIFIER
Speaker output
IC7
POWER IC
IC8
MUTE CONTROL LOGIC
3 input NOR gate x 3
IC9
EQUALIZER AMPLIFIER
For full logical cassette mechanism control
IC10
SUB MOTOR DRIVER
For full logical cassette mechanism sub motor driver
IC11
RESET IC
Detection voltage below 3.0V
IC12
EEPROM
Q1
P.CON.DETECTION
Detects P.CON voltage.
Q10
BACK-UP DETECTION
Detects the back-up voltage.
Q11
SERGE DETECTION
Detects serge voltage.
Q20
ACC DETECTION
Detects ACC voltage.
Q40
PREOUT MUTE DRIVER
Mutes when the base terminal voltage level becomes "L".
Q50
5V SW
Works when the base terminal voltage level becomes "L".
Q101
DSI SW
LED for DSI works when the base terminal voltage level becomes "H".
Q151
PANEL 5V SW
Works when the base terminal voltage level becomes "L". Supplies VDD to panel.
Q221-224 PREOUT MUTE
Mutes when the base terminal voltage level becomes "H".
Q251
POWER IC SVR SW
Discharges the capacitor's voltage of SVR terminal after the base terminal voltage becomes "H".
Q301
LOCAL SEEK SW
Changes to the local seeking after the base terminal voltage becomes "H".
Q501
MOTOR DRIVER AVR
Works when the base terminal voltage becomes "H". Supplies the power to the motor driver.
Q551
MAIN MOTOR SW
Works when the base terminal voltage becomes "L".
Q552
MAIN MOTOR SW
Works when the base terminal voltage becomes "H".
IC1
LCD DRIVER
IC2
REMOTE SENSOR
Q1
KEY SCAN SW
Receives key signal when the base terminal voltage becomes "L".
Q2
KEY ILLUMINATION SW
Key illumination color becomes green when the base terminal voltage becomes "H".
Q3
KEY ILLUMINATION SW
Key illumination color becomes red when the base terminal voltage becomes "H".
q SWITCH UNIT (X16-1532-71)
Ref.No.
Function
Operation
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KRC-4902Y
4
q
µ-COM (IC1 : X14-)
Pin No.
Pin name
I/O
Description
Processing Operation
1
DSI
O
DSI control.
2
PANEL
I
Panel detection.
"L": Panel exists.
3-
-
-
4
AVSS
-
GND.
5
L-RST
O
LCD driver reset.
6
L-CE
O
LCD driver chip enable.
7
AVREF1
I
Reference voltage
8-
-
-
9
PLL-DATA
I/O
Front-end communication data.
10
PLL-CLK
O
Front-end communication clock.
11
L-DATA L
I
LCD driver communication data.
12
L-DATA S
O
LCD driver communication data.
13
L-CLK
O
LCD driver communication clock.
14
R-DATA
I
RDS data.
15
R-QUAL
I
RDS QUAL.
16
CH-DATA C
I
Changer communication data.
17
CH-DATA H
O
Changer communication data.
18
CH-CLK
I/O
Changer communication clock.
19
M-STBY
I
Cassette tape stand-by detection.
"H": Stand-by.
20
T-END
I
Tape end detection.
"H": Run.
"L": Stop.
21
ACC-DET
I
ACC detection.
22
BU-DET
I
Back-up detection.
23
IC2 TYPE 0
I
For service.
"L": Normally.
24
IC2 TYPE 1
I
For service.
"L": Normally.
25
TYPE 0
I
Destination discrimination.
26
TYPE 1
I
Destination discrimination.
27
TYPE REF
O
Reference voltage for destination and service.
28
MOTOR
O
Cassette mechanism motor.
"H": ON.
"L": OFF.
29
PLL-CE
O
Front-end communication chip enable.
30
SD
I
Station detection.
"H": Station exists.
"L": Station does not exist.
31
ASF
O
Noise detection time constant switch.
32
LO/DX
O
Local seeking switch.
"H": LO.
"L": DX.
33
VSS1
-
GND.
34
P-MUTE
O
Power amplifier muting.
35
SVR
O
SVR control.
36
-
-
-
37
IC2-SCL
O
E-volume communication clock.
38
IC2-SDA
I/O
E-volume communication data.
39
MUTE
O
Muting control.
40
P-STBY
O
Power amplifier stand-by.
41
P.CON-DET
I
P.CON short-circuited detection.
42
CH-CONT
O
Changer control.
43
-
-
-
44
CH-REC H
O
Changer request.
45-47
-
-
-
48
EN2-1
O
Power supply IC control.
MICROCOMPUTER'S TERMINAL DESCRIPTION
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5
KRC-4902Y
Pin No.
Pin name
I/O
Description
Processing Operation
49
EN2-0
O
Power supply IC control.
50
BEEP
O
Buzzer.
51
EN3
O
Power supply IC control.
52
EN1
O
Power supply IC control.
53
SW 5V
O
P.ON 5V control.
"H": OFF.
"L": ON.
54
MUSIC
I
Tape signal detection.
"H": Signal does not exist.
"L": Signal exist.
55
MS-CONT
O
Tape advanced sensitivity control.
"H": Play.
"L": FF/REW.
56
EQ-MUTE
O
Cassette tape muting.
"H": ON.
"L": OFF.
57
FWD/REV
I
Cassette tape running direction detection.
"H": FWD
"L": REV.
58
SUB+
O
Sub motor control.
59
SUB-
O
Sub motor control.
60
RESET
I
System reset.
61
REMOTE
I
Remote control.
62
R-CLK
I
RDS clock.
63
CH-REQ C
I
Changer request.
64
PACK-IN
I
Cassette tape pack-in detection.
65
KEY-REQ
I
Key signal detection.
66
-
-
-
67
VSS0
-
GND.
68
VDD1
-
VDD.
69
X2
-
Main system clock.
70
X1
I
Main system clock.
71
IC
-
-
72
-
-
-
73
XT1
-
VDD.
74
VDD0
-
VDD.
75
AVREF 0
I
Reference voltage.
76
S-METER
I
SD detection.
"H": SD exists.
"L": SD does not exist.
77
T-MODE
I
Cassette tape mode detection.
78
PHONE
I
Navi mute: Over 2.5V. Tel mute: less than 2.5V.
79
NOISE
I
Noise detection during FM mode.
80
AV CONT
O
Reference voltage.
MICROCOMPUTER'S TERMINAL DESCRIPTION

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