KENWOOD KDC-C20V Service Manual

Cover page of KENWOOD KDC-C20V Service Manual

Service Manual for KENWOOD KDC-C20V, downloadable as a PDF file.

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© 2001-4 PRINTED IN JAPAN
B51-7786-00(S) 510
SERVICE MANUAL
VIDEO CD/CD AUTO CHANGER
KDC-C20V
COMPACT DISC AUTO CHANGER
KDC-C20V
NEW ANTI VIBRATION MECHANISM
DISC NAME PRESET
TEXT
10DISC
CD-R/RW
VIDEO CD
When transporting these models, always attach CAUTION CARD and STEPPED SCREW (for transportation).
The MECHANISM OPERATION is the same as model KDC-C710.
Please refer to the service manual of model KDC-C710 (B51-7104-00).
Service jig
W05-0635-00
Parts No.
For initial position setting
AUDIO CORD
(E30-4586-05)
SCREW SET
(N99-1628-15)
HOLDER ASSY
(J19-5074-02)
TRAY
(J99-0612-01)
BRACKET x 2
(J19-4712-23)
MOUNTING
HARDWARE ASSY x 2
(J21-9588-04)
ADHESIVE TAPE x 2
(J69-0506-04)
CORD WITH PLUG
(E30-4291-05)
REMOTE
CONTROLLER
ASSY
(A70-0876-05)
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© 2001-4 PRINTED IN JAPAN
B51-7786-00(S) 510
SERVICE MANUAL
VIDEO CD/CD AUTO CHANGER
KDC-C20V
COMPACT DISC AUTO CHANGER
KDC-C20V
NEW ANTI VIBRATION MECHANISM
DISC NAME PRESET
TEXT
10DISC
CD-R/RW
VIDEO CD
When transporting these models, always attach CAUTION CARD and STEPPED SCREW (for transportation).
The MECHANISM OPERATION is the same as model KDC-C710.
Please refer to the service manual of model KDC-C710 (B51-7104-00).
Service jig
W05-0635-00
Parts No.
For initial position setting
AUDIO CORD
(E30-4586-05)
SCREW SET
(N99-1628-15)
HOLDER ASSY
(J19-5074-02)
TRAY
(J99-0612-01)
BRACKET x 2
(J19-4712-23)
MOUNTING
HARDWARE ASSY x 2
(J21-9588-04)
ADHESIVE TAPE x 2
(J69-0506-04)
CORD WITH PLUG
(E30-4291-05)
REMOTE
CONTROLLER
ASSY
(A70-0876-05)
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KDC-C20V
2
BLOCK DIAGRAM
SW5V
LIM
SW
L.P
.S
EJ
SW
ARM
SW
12.5MHz
X2
SPINDLE/LO-EJ
SLED
LOE
SW
TR
COIL
FO
COIL
BTL
EEPR
OM
&TEXT
DECODER
APC
SA5V
Q1
S8V
IC7
IC1
RF
AMP&SER
V
O
DSP
16.93MHz
X1
P-ON
Q10
Q15-19
Q20
B
U
.DET
IC8
7
13
4
5
8
2
IC5
MG
SW
8V
A
V
R
S8V
S-RAM
24
C
B
U14V
CH
RST
A
UDIO
OUT
6
5V
REG
IC4
D
A5V
S8V
HO
T
IC9,Q11
RST
7V/9V
5V
Q21,22
B
U5V1
B
U5V2
SW5V
S3
S2
S1
SW5V
M
M
&DC
MO
T
O
R
DRIVER
ELEV
A
T
OR
M
AV
R
SA5V
Q9
&D/A
CONVER
TER
&SCF
B
UFFER
IC6
SD5V
F
E
A
D
B
PD
B
U5V2
AV
R
CH-MUTE
CHCON
VIDEO
OUT
IC11
COMM
SW
S4
SYSTEM
u-COM
IC11
NTSC/P
AL
SW
S1
8.38MHz
X1
Q17
RST
B
U5V
u-COM
DECODER
IC12
27MHz
X2
GENERET
OR
IC19
CLOCK
IC13
DIR
5
IC17,18
LEVEL
SHIFT
72
8
D-RAM
IC9
IC15
VIDEO
SW
DA
C
IC6
4
IC7
L.P
.F
.
MUTE
Q15,16,18
3
A8V
REG
IC1,Q1-3
B
U14V
A5V
REG
IC2
A5V
B
U5V
REG
B
U14V
Q13,14
B
U5V
D
ATA
H
REQH
D
ATA
C
CHCLK
REQC
IC5
5V
SW
.REG
3.3V
REG
IC4
S5V
S3.3V
MONIT
O
R
A
UDIO
SW
IC10,
A8V
MPEG
ASSY
(X13-
)
(X32-
)
(X35-
)
(X92-
)
PICKUP
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KDC-C20V
3
COMPONENT DESCRIPTION
q CD PLAYER UNIT(X32-4960-00)
Ref.No.
Component Name
Application/Function
Operation/Condition/Compatibility
RF amplifier built in digital servo and data processor IC. Focusing,
tracking, sled and spindle servo processing. Detection of dropout, anti-
shock, track crossing and off-track conditions.
IC1
UPD63711AGC
Servo IC
Automatic adjustment(focusing, tracking, gain, offset and
balance)operations. Digital signal processing(DSP, PLL, sub-codes,
CD-TEXT decode, CIRC error correction, audio data
interpolaration)operations.
IC4
KIA78L05F
+5V AVR
Analogue output circuit power supply for D/A converter
Focusing coil, tracking coil, spindle motor and sled motor driver.
VO1-VO4 and VOL outputs ON/OFF function.
While MUTE1 goes "Hi", VO1 outputs are turned on.
While MUTE2 goes "Hi", VO2-VO4 and VOL outputs are turned on.
VIN1 amplifier function(input selection and VREF selection)
IC5
LA6576
4 Ch Motor driver
1. Input selection.
While VIN SW terminal goes "Lo", IC pin 15, 16 and 17 inputs are selected.
While VIN SW terminal goes "Hi", IC pin 15, 18 and 19 inputs are selected.
2. VREF selection.
While VIN SW terminal goes "Lo", internal VREF(2.5V typical) is selected.
While VIN SW terminal goes "Hi", external VREF(IC pin 30 input) is selected.
IC6
TC7WHC04FU
Inverter
Digital data buffer
IC7
UPD784214GC098
Mechanism MI-COM.
Mechanism and servo control
IC8
W05-0870-00
EEPROM
Digital servo and LPS data back-up memory
IC9
S-80830ANNP
Reset IC
When BU 5V voltage is less than 3.0V, IC outputs "Lo".
IC11
LC3564BT-70
S RAM
CD-TEXT data memory
Q1
MCH6101
APC
Laser diode auto power control
Q9
2SB1202
Servo 5V AVR
Q9 is combined with IC5's pin 26 and 27 , and works as a driver of AVR.
Q10
2SB1295
P-ON 5V SW
While base goes "Lo", P-ON 5V is supplied to the microprocessor
peripheral circuits.
Q11
DTC124EK
Reset SW
When System Reset has activated, a base goes "Hi", and Q11 is turned on.
Q13
DTC124EUA
CH CON SW
While CH CON or CH-CON2 mode is selected, a base goes "Hi", and
Q13 is turned on.
Q14
DTA143EUA
CH MUTE SW
When MUTE REQUEST to H/U is outputted, a base goes "Lo", and
Q14 is turned on.
Q16
2SC4081
SRV 8V AVR
Q16 is combined with Q15(X92-), and works as a pre-driver of AVR.
Q17
DTA143EK
SRV 8V AVR SW
When Q18's base goes "Hi", Q17 is turned on, and SVR 8V AVR is working.
Q18
DTC124EUA
When a base goes "Hi", Q19 is turned on, and SVR 8V AVR is outputting +7V.
Q19
DTC124EUA
7/9V SW
When a base goes "Lo", Q19 is turned off, and SVR 8V AVR is
outputting +8.5V.
While BACKUP is applied, a base goes "Hi", and Q20 is turned on.
Q20
DTC124EK
BU DETECTION SW
When momentary power down has detected, a base goes "Lo", and
Q20 is turned off.
Q21
2SB1202
BU 5V AVR
While BACKUP is applied, AVR outputs +5V.
Q22
2SC4081
Q21 and Q22 are inverted Darlington connection.
Q30
DTC114YUA
Eccentric disc SW
When an eccentric disc is detected, Q30 is turned on, and a preceding
beam is made to be delayed.
Q31
DTC124EUA
VIN SW
While spindle servo or disc loading/eject mode is selected, a base
goes "Hi", and Q31 is turned on.
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KDC-C20V
4
q VIDEO UNIT(X35-4190-00)
Ref.No.
Component Name
Application/Function
Operation/Condition/Compatibility
IC1
M5237ML
AVR IC
IC is combined with Q1, and it works as the error detection, the driver.
IC2
TA78L05F
A. 5V AVR
For D/A converter and Clock generator power supply
IC4
L88M33T
D. 3.3V AVR
For MPEG decoder power supply
IC5
LM2674-5.0
D. 5V AVR
Output voltage 5V. A DC/DC Converter built-in the ON/OFF function.
IC6
AK4351
D/A converter
IC7
NJM4565MD
OP. AMP.
Low pass filter
IC9
MSM514260CP-60
D RAM
4M bit D RAM for MPEG data
IC10
PST9137NR
Reset IC
When BU 5V voltage is less than 3.7V, IC outputs "Lo".
IC11
UPD78011FGC573
MPEG MI-COM.
IC12
UPD61012GC-8EU
MPEG decoder
IC13
CS8412-IS
Digital Interface Receiver Digital data decoder
IC15
MM128XFBE
Video SW
Video buffer buit-in 3 input select function
IC17
TC7WT126FU
Buffer
Signal transfer between 3.3V and 5V signals
IC18
TC7WT126FU
Buffer
Signal transfer between 3.3V and 5V signals
IC19
TC9246F
Clock generator
Q1
2SB1184
A. 8V AVR
Q2
DTA124EUA
A. 8V AVR SW
A.8V AVR on/off control
Q3
DTC144EUA
When Q3's base goes "Hi", A.8V AVR outputs +8V.
Q4
DTA124EUA
Emphasis SW
Q4's base goes "Lo" during Emphasis ON.
Q5
2SA1576A
Q9
2SC4081
Video amp.
3 dB buffer
Q10
2SA1576A
Q13
2SB1184
BU 5V AVR
While BACKUP is applied, AVR outputs +5V.
Q14
2SC4081
Q13 and Q14 are inverted Darlington connection.
Q15
DTC343TK
Audio mute SW(L Ch)
When a base goes "Hi", Audio mute is activated.
Q16
DTC343TK
Audio mute SW(R Ch)
When a base goes "Hi", Audio mute is activated.
Q17
DTC124EUA
Reset SW
When Q17's base goes "Hi", MI-COM. reset is activated.
Q18
DTA144EUA
Audio mute driver
When Q18's base goes "Lo", Audio mute signal is outputted.
COMPONENT DESCRIPTION
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KDC-C20V
5
MICROCOMPUTER'S DESCRIPTION
q IC7 (CD PLAYER UNIT: X32-4960-00)
Pin No. Pin Name
I/O
Description
Processing Operation
1
NOR/RW
O
CD-DA/CD-RW Switching
Not used(N.C.)
2
TSTB
O
CD-TEXT parameter strobe
3
P-CON
O
P-CON output
"Hi": POWER ON
4
FOK
I
Focus OK input
"Hi" : Focus OK
5
XTALEN
O
D.R.I.V.E. IC oscillation stop control
"Hi" : Oscillation stop
6
RST
O
Servo IC & D.R.I.V.E. IC reset terminal
"Lo" : Reset
7
SAO
O
Servo IC command/parameter setting
"Hi" : Parameter setting, "Lo" : Address resister setting
8
SSTB
O
Servo IC command/parameter setting strobe
"Hi"
"Lo" : Serial data latch
9
VDD
-
Positive power supply connection terminal
Connected to D 5V lines.
10
X2
-
Main clock resonator connection terminal 2
11
X1
I
Main clock resonator connection terminal 1
12
VSS
-
Ground connection terminal
Connected to GND lines.
13
XT2
-
Sub clock resonator connection terminal 2
Not used(N.C.)
14
XT1
I
Sub clock resonator connection terminal 1
Not used(connected to GND lines)
15
RESET
I
System reset
"Lo" : System reset
16
FOGUP
I
Vibration detect input
"Hi" : Vibration detect
17
MGSW
I
Magazine switch
"Hi" : Magazine in
18
EJSW
I
Eject switch
"Hi" : Eject switch ON
19
COMMSW
I
5-line communication old/new switch
"Hi" : New communication, "Lo" : Old communication
20
PACK
I
Text data pack synchronous signal
"Hi"
"Lo" : The head of the pack data
21
CH-CON
I
Changer control input
"Hi" : Standby, "Lo" : Operation
22
BUDET
I
Momentary power down detection input
"Hi" : When momentary power down detected or BU OFF
"Lo" : BU ON
23
AVDD
-
A/D converter positive power supply connection terminal Connected to D 5V lines.
24
AVREF0
I
A/D converter reference voltage input
Connected to PON 5V lines.
25
HOT
I
Rise in temperature detection
4V or less: Not detection, 4V or greater: Temp. detection
26
LPS
I
LPS Mechanical deck position detection
27
LOESW
I
Loading completion switch input
"Lo" : Loading completed
28
LIMSW
I
Limit switch input
"Lo" : Pickup most inner position
29
TOFF
I
Tracking OFF mode
Not used(pull down to GND lines)
30
ADJSEL
I
Servo automatic adjustment ON/OFF terminal
Not used(pull down to GND lines)
31
TBANK
I
Tracking gain switching mode
Not used(pull down to GND lines)
32
SIM2
I
Destination input 2
"Lo": CD changer, "Hi": Video changer
33
AVSS
-
A/D converter ground connection terminal
Connected to GND lines.
34
LPSCO
O
LPS A/D converter reference power control
Not used(N.C.)
35
AMUTE
O
Audio mute
"Lo" : Audio mute ON
36
AVREF1
I
D/A converter reference voltage input
Connected to D 5V lines.
37
SDI
I
Servo IC communication serial data input
38
SDO
O
Servo IC communication serial data output
39
SCK
O
Servo IC communication serial clock output
40
DATAH
I
Data input from H/U
41
DATAC
O
Data output from the changer
42
HCLK
I/O Communication clock input/output with H/U
43
RECQC
O
Communication request to H/U
"Lo" : Communication requested
44
CHMUTE
O
Audio mute request to H/U
"Lo" : Audio mute requested
45
TSI
I
Text data input from servo IC
46
TSO
O
Text data output to servo IC
47
TSCK
O
Text data clock to servo IC
48-55 A0-A7
O
Address setting terminal for S-RAM
56-63 D0-D7
I/O Data input/output terminal with S-RAM
64-68 A8-A12
O
Address setting terminal for S-RAM
69-71 A13-A15
O
Chip enable setting terminal for S-RAM
Not used(pull down to GND lines)
72
VSS
-
Ground connection terminal
Connected to GND lines.
73
A16
O
Chip enable setting terminal for S-RAM
Not used(pull down to GND lines)
74
A17
O
Chip enable setting terminal for S-RAM

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