Kenwood KDC-X679 User manual

© 2004-1 PRINTED IN JAPAN
B53-0122-00 (N)764
CD RECEIVER
KDC-X679
SERVICE MANUAL
Size AA battery
(Not suplied)
Plastic cabinet assy
(A02-2732-03) Lever (D10-4589-04)
x2
Screw
(N09-6212-05)
DC cord
(E30-6294-05)
Screw set
(N99-1723-05)
Mounting hardware assy
(J21-9716-03)
Panel assy
(A64-3212-12)
Remote controller assy (RC-505)
(A70-2059-05)
CD MECHANISM EXTENSION CORD (24P) :W05-0935-00
MODEL TDF PANEL No. TDF NAME
KDC-X679 Y33-1990-60 TDF-46DX
TDF PANEL INFORMATION
Escutcheon
(B07-3083-02)

KDC-X679
2
BU
BU
SW5
BU5
SW3 F+/F-
FL+B
(X34-300)
(X16-251)
F/E
LX-BUS
PANEL-
MECHA
DXM6540W
DXM6110W
CD
INGAIN
STD
MAIN
SUB
PHONE
/NAVI
INPUT-MPX
INGAIN
+
TREBLE
BASS
VOLUME
MID
0
AUTOZER
OUT-SEL SOFT
MUTE
FRONT
REAR
NF/R
FRONT
REAR
NF
FADER
DC
DET
OFFSET
SYSTEM E'S+
E-VOL PW-IC
PRE-OUT
PRE-OUT
PRE-OUT
SP-OUT
MUTE 5V PRE
MUTE 5V PRE
MUTE 5V PRE
ACCACC-DET
REG.ANT-SW
SERVO
CD REG. P-CON
REG. BU
SW BU5V
PRE REG.
DC/DC
SW11V
FL
F+/F-
FL +B
PRE
SW5V
5V
MECHA
PANEL
DRIVER+B
5V
BU5V
ILL+B
A8V
CD-4.7V
BU-DET
ANT-CON
SYSTEM u-COM
REMO
KEY
MATRIX
u-COM
PANEL
SHIFT
LEVEL FL
SW
AC IN
MUTE
MUTE
METER
LEVEL
A2
IC2
IC14
IC5 Q56,57
Q58,59
IC1
IC3 IC1
ED1 Q3 A1
IC20 Q15,16
IC7
Q35
IC3,Q8
Q27Q25Q10,11Q7,9
Q3 Q1,2
IC8,Q17,20,23
Q36
IC15
IC17
IC16Q49,50
Q51,52
Q47,48
IC4
SW REG.
BU5
MPX
CH
CD
NAVI
CH/AUX
AC IN0
AC IN1
AC IN2
AC IN3
AC OUT
SUB
IN1 : HPF
IN2 : 2ZONE
IN3 : LPF
ACIN 3+LPF
: FREE ONLY
2ZONE
NF
R
DC
MUTE L/R
FRONT
MUTE L/R
REAR
MUTE L/R
NF
R/L
R/R
F/L
F/R
MONO 2ch
PON P-CON
PON
PON CD/MD
PON
AUDIO
PWIC
POWER
DET
PON ILL
TYPE
PANEL
FL+B
F
CD SERVO
BLOCK DIAGRAM

KDC-X679
3
●SUB-CIRCUIT UNIT (X16-2510-10)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 Panel µcom
IC2 3.3V Regulater The power supply of IC and VFD (Logic) which are driven by 3.3V
IC3 Remote Control IC
IC4 Buffer IC It is change into 3.3V from 5V
Q1 FL BLK SW VFD is turned on when Q1’s base level goes “H”
Q2,3 FL+B SW FL+B (VDD2) is turned on when Q2’s base level goes “H”
Q4 SW5V The power supply of IC3 is turned on when Q4’s base level goes “L”
Q6 ∇LED SW ∇LED is turned on when Q6’s base level goes “H”
Q7,9 Red LED SW RED LED is turned on when Q7’s base level goes “L”
Q8,10 Green LED SW GREEN LED is turned on when Q8’s base level goes“L”
Q11,12 Blue LED SW BLUE LED is turned on when Q11’s base level goes “L”
●ELECTRIC UNIT (X34-3000-10)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 System µCOM Controls FM/AM tuner, the changer, CD/MD mechanism, Panel, volume and tone.
IC2 E.Vol & N.C.MPX Controls the source, volume, tone and FM multiplex detector
IC3 A8V Ref Power Supply Output 1.27V
IC4 Power IC Amplifies the front L/R and the rear L/R to 50W or 47W maximum.
IC5 System E’s 4HPF&1Gain Controll
IC7 SW Regulator Power Supply for mp3
IC8 ±9V AVR Power Suppil for 5V Pre Out
IC10 Muting logic IC Controls logic for muting.
IC11 Reset IC “L” when detection voltage goes below 3.6V or less.
IC13 Panel mecha motor driver Panel mecha control
IC14 Level meter Buffer The signal of IC2 is sent to Panel µcom
IC15~17 5V Pre-out Amp
IC20 SW Regulator Power Supply for VFD
Q1,2 B.U.5V AVR While BU is applied, BU5V AVR outputs +5V.
Q3,4 SW5V When Q4’base goes Hi, SW5V outputs +5V.
Q5 SW14V When Q5’2pin goes Hi, SW14V outputs 14V.
Q6,8 AUDIO8V AVR When Q6’2in goes Hi, A8V AVR outputs 8.0V.
Q7,9 SERVO+B AVR When Q9’base goes Hi, S+B AVR outputs 7.5V.
COMPONENTS DESCRIPTION
IN Panel mecha
IN1 IN2
LL WAIT
LH OPEN
HL CLOSE
HH STOP

KDC-X679
4
Ref. No. Application / Function Operation / Condition / Compatibility
Q10,11 SERVO+B AVR (Panel Mecha) When Q10’base goes Hi, S+B AVR outputs 8.5V.
Q12 SW for IC7 When Q12’base gose Lo, IC7 is turned on.
Q13,15,16 FL&ILL AVR When Q13’2pin goes Hi, ILL AVR outputs 10.5V.
Q17,18 AUDIO 10.5V AVR When Q16’base goes Hi, AVR outputs 10.5V.
Q19~21 Pre-Amp -9V AVR Q19 and 21 works as a differential amplifier, Q20 works as a driver and -9.1V is supplied
to OP Amp for Pre-out.
Q22~24 Pre-Amp +9V AVR Q22 and 24 works as a differential amplifier, Q23 works as a driver and +9.4V is supplied
to OP Amp for Pre-out.
Q25,26 P-ANT SW When Q23’base goes Hi, P-ANT SW outputs 14V.
Q27,30 P-CON SW When Q30’base goes Hi, AVR outputs 14V.
Q28,29 P-CON Protection Protect Q27 by turning on when P-CON output is grounded.
Q31 Ex Amp Control Buffer
Q32 Small lamp det SW When Q32’base goes Hi, Q32 is turned on.
Q33,34 SERGE Det. When Q33’base goes Hi, IC4 is changed into a standby state.
Q35 BU det When Q35’base gose Hi, Q27 is turned on.
Q36 ACC det When Q36’base gose Hi, Q29 is turned on.
Q37,38 Pre-out mute driver When a base gose Lo, mute driver is turned on.
Q39 Sub-out mute driver When a base gose Lo, mute driver is turned on.
Q40 AC-out mute driver When a base gose Lo, mute driver is turned on.
Q41,42 AM+B SW When Q42’base gose Hi, AM+B is out.
DSI lights when the base is “L”.
Q44 DSI Driver DSI turns off when the base is “H”.
DSI turns on and off when panel is taken off.
Q45,46 Panel 5V SW When Q46’base gose Hi, PANEL 5V is out.
Q47~52 Pre-out mute SW When a base gose Hi, Pre-out is muted.
Q56,57 AC-out mute SW When a base gose Hi, AC-out is muted.
Q58,59 Sub-out mute SW When a base gose Hi, Sub-out is muted.
Q60 Level meter mute SW When a base gose Hi, Level meter is muted.
COMPONENTS DESCRIPTION

KDC-X679
5
MICROCOMPUTER’STERMINAL DESCRIPTION
●SYSTEM MICROCOMPUTER : 30624MGPA27GP (X34 : IC1)
Pin No. Pin Name Module I/O Application
Truth Value
Processing Operation Description
Table
1~4 NC O Not used Output : L
5OPEL_REMO EXTRA I External display remote control input Not used
6BYTE - 0V GND direct connection
7CNVSS I Used when writing to system µcom Pull down
8XCIN I Sub clock input (32.768kHz)
9XCOUT I Sub clock output (32.768kHz)
10 RESET - Reset terminal L : Reset
11 XOUT - Main clock output (16.0MHz)
12 VSS -
13 XIN - Main clock input (16.0MHz)
14 VCC1 -
15 NMI I Not used
16 ES_SW EXTRA O Not used
17 NC I Not used
18 LX_REQ_S LX_M I Communication request from slave unit
19 PON_AM TUNER O AM power supply control AM operation :H, Non-AM operation : L
20 MUTE_LEVEL EXTRA O LEVEL_METER MUTE terminal Mute ON : H, Mute OFF : L
21 TUN_IFC_OUT TUNER I F/E IFC OUT input terminal H : Station detect, L : No detect
22 RDS_AFS_L TUNER I/O Constant switching at noise detect rRefer to truth value table.
23 RDS_AFS_M TUNER I/O Constant switching at noise detect rRefer to truth value table.
24,25 NC I Not used
26 PWIC_BEEP PWIC O Beep output
27 TUN_SCL TUNER I/O F/E I2C clock output terminal (MAX 400kHz)
28 TUN_SDA TUNER I/O F/E I2C data input/output terminal
29 PAN_DATA to PANEL I/O Between-panel communication (Bi-directional)
30 PAN_CLK to PANEL I/O Between-panel communication clock
31 PAN_SCREQ to PANEL I/O Between-panel communication request
termnal (Used also for PN_DET)
32 PAN_PNREQ to PANEL I Between-panel communication request terminal
AUD_SDA AUDIO I/O E-VOL I2C data input/output terminal
33 IC5_SDA AUDIO I/O IC5 data output terminal
CD_SDA CD I/O CD mechanism I2C data input/output terminal
AUD_SCL AUDIO I/O E-VOL I2C clock output terminal
34 IC5_SCL AUDIO I/O IC5 clock output terminal
CD_SCL CD I/O CD mechanism I2C clock output terminal
35 PON_PAN Power supply I/O Panel 5V control terminal ON : H, Momentary power down, Panel come
off and 11 minutes after ACC_OFF : Hi-Z