© 2000-1 PRINTED IN JAPAN
B51-7580-00(S) 2209
SERVICE MANUAL
MD RECEIVER
KMD-671R
q This service manual does not include information on the MD mechanism assembly (explodedview, parts list,
schematic diagram or mechanism description).
For such information, refer to the MD mechanism assembly manual (X92-3390-00,0-01,X92-3560-00,
X92-3580-00:B51-7461-00).
SIZE AAA Battery
Not supplied as
service parts
ATT
LOUD
12
SCAN
MD RECEIVER CD·MD-CHANGER CONTROL
34
RDM
REP
56
D.SCAN
M.RDM
45Wx4
TI
VOL ADJ
MENU
AUD
CLK
NAME.S
DISC-
AM
FM
DISC +
PWR
OFF
SRC
PTY
L
KMD-671R
Mounting hardware assy
(J21-9491-03)
Plastic cabinet assy
(A02-1486-13)
Stay
(J54-0606-04)
: M type only
Lever
(D10-3031-04) x2
Antenna adaptor
(T90-0523-05)
: E type only
DC cord
(E30-4790-05)
: E type only
DC cord
(E30-4785-05)
: M type only
Screw set
(N99-1610-15)
: M type only
Screw set
(N99-1632-05)
: M type only
Escutcheon
(B07-2181-02)
Front glass
(B10-3117-01)
Panel assy
(A64-1881-02)
Remote controller assy
(A70-0883-05): M type only
BLOCK DIAGRAM
KMD-671R
2
A8V
SW5V
UP
BA
CK
and
E-V
OL
MPX
CH
MD
AM
FM
VDD
QU
A
L
LEVEL
MP
IN
IC2
Q21,22
MUTE
MUTE
DRIVER
Q19,20
IC8,
Q23
200mV
170mV
1200mV
1200mV
B
UFF
Q29
FM+B
AM+B
Q27,28
TUN5V
A
UDIO
OUT
VDD
5V
IF1/IF2/PLL+B
AM+B
FM+B
S-METER
SD
ANT
S
5.0V
A8V
B
U5V
LO
AD
LOE
SW
LOS
SW
MD
EJECT
M
ST
OP
M
RST
M
MUTE
M
D
ATA
M
CLK
B
U5V
RCLK
RD
ATA
QUA
L
NOISE
AFC
SD
S-METER
AMP
NOISE
RDS
DECODER
IC10
u-COM
IC1
IC7,Q33
RST
LD
ATAS
LCLK
LD
ATAL
REMO
P ANEL
Q24
B
U5V
P
AN
5V
SW
P
ANEL
IC2
P
AN
5V
RST
SW
(X13)
IC1
REMO
TE
CONTR
OL
WITH
LCD
DRIVER
KEY
MA
TRIX
LCD
ILL.
SW
SW5V
P
AN
5V
MD
SER
V
O
AV
R
IC6
A.8V
A
V
R
IC3,Q5
A.8V
A
V
R
ON/OFF
SW
Q3,4
ILLUMI
A
V
R
Q7-9
KMD-671R(M,E)
P-CON
BA
CK
UP
B
U5V
SW5V
B
U5V
Q1,2
P-CON
Q13-16
SP-OUT
TEL-MUTE
AC
C
PR
O
TECTION
THERMAL
PO
WER
IC
SVR
SW
3529mV
AM
FM
773mV
1258mV
CD-CH
MD
3529mV
PRE
OUT
IC4
MUTE
SDA
SCL
PHONE
TEL-MUTE
Q18
A
CC
DET
.
A
CC
DET
.
SVR
B
U
DET
.
DSI
Q10
Q17
B
U
DET
.
Q34
DSI
SD
A
SCL
Q30-32
S
MUTE
MP
OUT
RST
D
ATA
C
REQ
H
CH-CON
D
ATA
H
REQ
C
CLK
MUTE
CH
LINH
LCE
SER
V
O
A
V
R
ON/OFF
SW
Q6
S
5.0V
A8V
P-ANT
SW5V
B
U5V
VLCD
A
V
R
Q4
Q2,3
KMD-671R(E)
A1
Q25,26
TUNER
SCL
SDA
CONTENTS
BLOCK DIAGRAM .............................................................. 2
COMPONENT DESCRIPTION ........................................... 3
MICROCOMPUTER'S DESCRIPTION ............................... 4
ADJUSTMENT .................................................................... 6
PC BOARD ......................................................................... 7
SCHEMATIC DIAGRAM ................................................... 11
EXPLODED VIEW ............................................................ 17
PARTS LIST ...................................................................... 18
SPECIFICATIONS ............................................... Back cover
KMD-671R
3
COMPONENT DESCRIPTION
q SWITCH UNIT(X13-9702-71)
Ref.No.
Component Name
Application/Function
Operation/Condition/Compatibility
IC1
LC75808W
LCD driver with key-matrix
IC2
RS-171
Remote control light sensor
Q1
DTA114EKorUN2111
Key-matrix permission SW
Ready on key-matrix, ON when the base goes "Lo".
Q2
2SD2114K
Illumination SW(Red)
ON when the base goes "Hi".
Q3
2SD2114K
Illumination SW(Green)
ON when the base goes "Hi".
Q4
2SC2412Kor2SD601A
LCD AVR
q ELECTRIC UNIT(X25-845X-XX)
Ref.No.
Component Name
Application/Function
Operation/Condition/Compatibility
IC1
UPD784216GF520
System MI-COM.
IC2
TDA7400D
E-VOL. & N.C. MPX
IC3
M5237ML
AVR IC
IC is combined with Q5, and it works as the error
detection, the driver.
IC4
TDA7386
Power IC
IC6
LM2595S-5.0
MD SERVO AVR
Output voltage 5.0V fixation. A DC/DC Converter with
the ON/OFF function.
IC7
PST9130NR
Reset IC
"L":detection voltage below 3.0V
IC8
HD74HC27FP
Mute logic
3 input NOR gate x3
IC10
TDA7479D
RDS decoder
Q1
2SC4081or2SD1819A
BU 5V AVR
Inverted darlington connection
Q2
2SB1565F(E,F)
On during BU applied.
Q3
DTA124EUAorUN5112
Audio 8V AVR ON/OFF SW
Audio 8V AVR ON/OFF control
Q4
DTC144EKorUN2213orKRC104S
Q3 is turned ON when Q4's base goes "Hi".
Q5
2SB1565F(E,F)
Audio 8V AVR
Output voltage 8.3V
Q6
DTC144EKorUN2213orKRC104S MD SERVO AVR ON/OFF SW AVR IC is activated when Q6's base goes "Hi".
Q7
DTC144EUAorUN5213
Illmination AVR
AVR output is ON when Q7's base goes "Hi".
Q8
DTA124EUAorUN5112
Q9
2SD1760
Q10
2SA1036K
SW 5V
ON when the base goes "Lo".
Q13
2SB1277(Q,R)
P-CON SW
Q13 is turned ON when Q16's base goes "Hi".
Q16
DTC114YKorUN2214orKRC107S
Q14
2SA1037K
P-CON protection
Protect Q13 by turning ON when P-CON output is
grounded.
Q15
DTA124EKorUN2112orKRA103S
Prevents Q14 tuning ON during start-up after power
ON.
Q17
2SC2412Kor2SD601A
BU detection(Momentary power ON when the base goes "Hi" during BU applied.
down detection)
Q18
2SC2412Kor2SD601A
ACC detection
ON when the base goes "Hi" during ACC applied.
Q19
DTA124EKorUN2112orKRA103S Mute driver for Audio mute SW ON when the base goes "Lo".
Q20
DTC144EKorUN2213orKRC104S E-VOL. mute SW
E-VOL. is muted when the base goes "Hi".
Q21
DTC143TKorUN2216
Audio mute SW
Audio pre-outs are muted when the base goes "Hi".
Q22
DTC143TKorUN2216
Q23
DTC114YKorUN2214orKRC107S SVR SW
POWER IC RESET is activated when the base goes "Hi".
Q24
2SA1576A
Panel detection SW
ON when the base goes "Lo" during the panel closed.
Q25
DTC124EKorUN2212orKRC103S FM+B SW
Q26 is turned ON when Q25's base goes "Hi".
Q26
2SB1277(Q,R)
ON during FM reception
Q27
DTC124EKorUN2212orKRC103S AM+B SW
Q28 is turned ON when Q27's base goes "Hi".
Q28
2SB1277(Q,R)
ON during AM reception
Q29
2SC4081or2SD1819A
Composite signal output buffer
Q30
2SC4081or2SD1819A
Noise buffer
Q31
DTC114TKorUN2215
AFC time constant SW
OFF during FM seek, ON during FM reception
Q32
DTA124EKorUN2112orKRA103S
Q31 is turned OFF when Q32's emitter goes "Lo".
Q33
DTC144EKorUN2213orKRC104S RESET SW
System RESET is activated when the panel reset SW
is pushed.
Q34
2SC4081or2SD1819A
DSI driver
ON when the base goes "Hi".
KMD-671R
4
MICROCOMPUTER'S DESCRIPTION
q Terminal Description
Pin No. Pin Name
I/O
Description
Processing Operation
1
TYPE 0
I
Destination type input terminal 0
Pull up to BU 5V lines
2
TYPE 1
I
Destination type input terminal 1
Pull down to GND
3
N.C.
O
Not used
4
N.C.
O
Not used
5
N.C.
O
Not used
6
N.C.
O
Not used
7
N.C.
O
Not used
8
N.C.
O
Not used
9
VDD
-
VDD connection terminal
Connected to BU 5V lines
10
STBY
O
Power IC standby control output
"Hi": POWER ON mode
11
SVR
O
Power IC reset terminal
When the momentary power down, after ACC OFF
is detected and after POWER OFF, the output goes
"Hi" temporarily.
12
N.C.
O
Not used
13
P-MUTE
O
Power IC mute control
"Lo": Mute
14
ANT-CON
O
Antenna control
"Hi": during FM/AM reception
15
IC2-SCK
O
Clock output to the E-VOL. IC
16
N.C.
O
Not used
17
P-CON
O
Power control
"Hi": POWER ON mode except ALL OFF mode
18
ACC-DET
I
ACC detection input
"Hi": ACC OFF, "Lo": ACC ON
19
REMO
I
Data input from the remote control light sensor
20
P-ON
O
A.8V AVR ON/OFF control terminal
"Hi": POWER ON mode or during MD Loading/
Eject
21
BU-DET
I
Momentary power down detection input
"Hi": When momentary power down detected or
BU OFF, "Lo": BU ON
22
TSET
-
Not used
Connected to GND
23
IC2-SDA
I/O Data input/output with the E-VOL. IC
24
MUTE
O
Mute control output
"Hi": Mute ON, "Lo": Mute OFF
25
SW5
O
SW 5V control
"Lo": POWER ON mode or during MD Loading/
Eject
26
M-CLK
I/O Clock input/output with the MI-COM. of MD mecha.
27
M-DATA
I/O Data input/output with the MI-COM. of MD mecha.
28
IC3-SDA
I/O Data input/output with the F/E(tuner)
29
CHCON
O
Changer control
"Lo": Standby, "Hi": during the movement
30
IC3-SCK
O
Clock output to the F/E(tuner)
31
REQ H
O
Request output to changers
"Lo": Request
32
ILL-ON
O
Illumination AVR ON/OFF control terminal
"Hi": POWER ON mode
33
DSI
O
DSI output terminal
"Hi": DSI LED ON
34
N.C.
O
Not used
35
N.C.
O
Not used
36
MD+B
O
MD servo +B ON/OFF control terminal
"Hi": MD source is selected or during MD Loading/
Eject
37
VDD
-
VDD connection terminal
Connected to BU 5V lines
38
X2
-
Main clock resonator connection terminal
39
X1
I
Main clock resonator connection terminal
40
VSS
-
Ground connection terminal
Connected to GND
41
XT2
-
Sub clock resonator connection terminal
42
XT1
I
Sub clock resonator connection terminal
43
RESET
I
Reset input terminal
"Lo": System reset
44
N.C.
O
Not used
45
R-CLK
I
Clock input from RDS decoder
46
REQ C
I
Request input from changers
"Hi": Request
47
KEY-REQ
I
Key request terminal
"Lo": Request
48
N.C.
O
Not used
49
LOS-SW
I
MD insertion detection terminal
"Lo": MD insertion detected
System
µ-com : UPD784216GF520
Pin No. Pin Name
I/O
Description
Processing Operation
50
N.C.
O
Not used
51
AVDD
-
VDD connection terminal
Connected to BU 5V lines
52
AVREF 0
-
VDD connection terminal(A/D converter reference Connected to BU 5V lines
voltage input)
53
PHONE
I
PHONE detection input
1V or less: TEL MUTE, 2.5V or greater: NAVI MUTE
54
N.C.
I
Not used
Connected to GND
55
NIOSE
I
Noise detection input
56
S-METER
I
S-meter input from the F/E(tuner)
57
N.C.
I
Not used
Connected to GND
58
N.C.
I
Not used
Connected to GND
59
N.C.
I
Not used
Connected to GND
60
M-MUTE
I
Mute request from the MI-COM. of MD mecha.
"Lo": Mute requested
61
AVSS
-
Ground connection terminal(A/D, D/A converter)
Connected to GND
62
N.C.
O
Not used
63
M-RST
O
Reset output to the MI-COM. of MD mecha.
"Lo": Reset
64
AVREF 1
-
VDD connection terminal(D/A converter reference Connected to BU 5V lines
voltage input)
65
DATA C
I
Data input from changers
66
DATA H
O
Data output to changers
67
CH-CLK
I/O Clock input/output with changers
68
L-DATAL
I
Data input from the LCD driver IC
69
L-DATAS
O
Data output to the LCD driver IC
70
L-CLK
O
Clock output to the LCD driver IC
71
M-STOP
O
Stop request to the MI-COM. of MD mecha.
"Lo": Stop, "Hi": during the movement
72
BEEP
O
BEEP sound output
73
N.C.
O
Not used
74
N.C.
O
Not used
75
N.C.
O
Not used
76
LOE-SW
I
MD loading complete detection SW input terminal "Lo": MD loading completion
77
EJECT
O
MD mecha. Loading/Eject switching output terminal Standby : (EJECT, LOAD)=(Lo, Lo)
Eject
: (EJECT, LOAD)=(Hi, Lo)
78
LOAD
O
MD mecha. Loading/Eject switching output terminal Loading : (EJECT, LOAD)=(Lo, Hi)
Brake
: (EJECT, LOAD)=(Hi, Hi)
79
L-INH
O
INH output to the LCD driver IC
"Hi": Active, "Lo": LCD indication OFF
80
L-CE
O
CE output to the LCD driver IC
"Hi": Active
81
PANEL
I
Panel detaching detection input
"Lo": Panel not detached
82
N.C.
O
Not used
83
N.C.
O
Not used
84
QUAL
I
Quality input from RDS decoder
85
R-DATA
I
Data input from RDS decoder
86
N.C.
O
Not used
87
N.C.
O
Not used
88
SD
I
SD input from the F/E(tuner)
"Hi": Station detected, "Lo": Not detected
89
N.C.
O
Not used
90
N.C.
O
Not used
91
N.C.
O
Not used
92
AFC
O
Noise detection time constant switching terminal
"Lo": During FM seek, "Hi": During FM reception
93
N.C.
O
Not used
94
N.C.
O
Not used
95
N.C.
O
Not used
96
AM+B
O
AM+B control
"Hi": during AM reception
97
FM+B
O
FM+B control
"Hi": during FM reception
98
ST TYPE 0
I
IC2 stereo data setting terminal
"Lo": Initial value
99
ST TYPE 1
I
IC2 stereo data setting terminal
"Lo": Initial value
100
VSS
-
Ground connection terminal
Connected to GND
KMD-671R
5
KMD-671R
6
MICROCOMPUTER'S DESCRIPTION
ADJUSTMENT
TEST MODE
1. To enter test mode
While holding the "FM" key and preset "6" key, reset the unit.
All indication segments are ON at the beginning of test mode.
2. To release test mode
Simply reset the unit.
(NOTE) The test mode is not canceled by ACC OFF, power
OFF, momentary power down.
3. MD receiver test mode specification
Pressing the "Track Up" key jumps between tracks in the
following order.
No.7
No.2 No.13 No.23 No.30 No.34 No.7
(Same as the beginning)
Pressing the "Track Down" key jumps to the previous track
to the being played.
Pressing the preset "1" key jumps to No.28 track. Again
pressing the preset "1" key jumps to No.22 track.
4. Audio adjustment
The volume is set to -10dB (which is shown as 30).
Loudness is OFF. CRSC becomes OFF regardless of the
functional excuse, too.
The BASS / TREBLE and BALANCE / FADER controls can
be set to the full boost / full cut and full front / full rear and full
right / full left respectively by pressing the "Track Up" / "Track
Down" keys.
Sound coordination(Kex / ec4 / dB) doesn't appear for the
Audio mode feed.