KENWOOD KRC19G Service Manual

Cover page of KENWOOD KRC19G Service Manual

Service Manual for KENWOOD KRC19G, downloadable as a PDF file.

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CASSETTE RECEIVER
KRC-19A/G
SERVICE MANUAL
© 2000-11 PRINTED IN KOREA
B51-7688-00 (K) 1755
KRC-289
AUD
1
23
456
CLK
ATT
SRC
PWR
OFF
AME
ADJ
AUTO
T.C/D.SCN
LOUD
CRSC
A.ADJ
FM
AM
FF
REW
PR
OG
KRC-289
CD/MD-CHANGER CONTROL
AUD
1
23
456
CLK
ATT
SRC
PWR
OFF
AME
ADJ
AUTO
T.CALL
LOUD
CRSC
A.ADJ
FM
AM
FF
REW
PR
OG
KRC-19
AUD
1
23
456
CLK
ATT
SRC
PWR
OFF
AME
ADJ
AUTO
T.CALL
LOUD
CRSC
A.ADJ
FM
AM
FF
REW
PR
OG
KRC-19
REP
RDM
SCAN
M.RDM
DISC
+
-
HIGH POWER
40Wx
40Wx 4
HIGH POWER
40Wx
40Wx 4
HIGH POWER
40Wx
40Wx 4
ANTENNA ADAPTOR
(T90-0523-05
or T90-0534-05)
: KRC-19A/G
DC CORD
(E30-4784-05):KRC-289
STAY
(J54-0606-04):KRC-289
SCREW SET
(N99-1610-15)
: KRC-289
PLASTIC CABINET ASSY
(A02-1486-13)
LEVER x2
(D10-3031-04)
MOUNTING HARDWARE ASSY
(J21-9491-13)
KRC-289
KRC-19G
KRC-19A
SCREW SET
(N99-1632-05)
: KRC-289
DC CORD
(E30-4790-05):KRC-19A/G
40%
background image
CASSETTE RECEIVER
KRC-19A/G
SERVICE MANUAL
© 2000-11 PRINTED IN KOREA
B51-7688-00 (K) 1755
KRC-289
AUD
1
23
456
CLK
ATT
SRC
PWR
OFF
AME
ADJ
AUTO
T.C/D.SCN
LOUD
CRSC
A.ADJ
FM
AM
FF
REW
PR
OG
KRC-289
CD/MD-CHANGER CONTROL
AUD
1
23
456
CLK
ATT
SRC
PWR
OFF
AME
ADJ
AUTO
T.CALL
LOUD
CRSC
A.ADJ
FM
AM
FF
REW
PR
OG
KRC-19
AUD
1
23
456
CLK
ATT
SRC
PWR
OFF
AME
ADJ
AUTO
T.CALL
LOUD
CRSC
A.ADJ
FM
AM
FF
REW
PR
OG
KRC-19
REP
RDM
SCAN
M.RDM
DISC
+
-
HIGH POWER
40Wx
40Wx 4
HIGH POWER
40Wx
40Wx 4
HIGH POWER
40Wx
40Wx 4
ANTENNA ADAPTOR
(T90-0523-05
or T90-0534-05)
: KRC-19A/G
DC CORD
(E30-4784-05):KRC-289
STAY
(J54-0606-04):KRC-289
SCREW SET
(N99-1610-15)
: KRC-289
PLASTIC CABINET ASSY
(A02-1486-13)
LEVER x2
(D10-3031-04)
MOUNTING HARDWARE ASSY
(J21-9491-13)
KRC-289
KRC-19G
KRC-19A
SCREW SET
(N99-1632-05)
: KRC-289
DC CORD
(E30-4790-05):KRC-19A/G
40%
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KRC-19A/G,289
2
BLOCK
DIAGRAM
IC1
KEY
PAN 5V
MUTE
B.U. DET.
B.U.
ACC
P-CONT.
MUTE
PRE
POWER IC
EQ. AMP.
CH ISO AMP
NC/MPX
E-VOL.
CD/MD
CHANGER
FRONT Lch
FRONT Rch
REAR Lch
REAR Rch
J2
LCD DRIVER
LCD
MAIN
TAPE MECHA.
IC5
1 Lch
2 Rch
PRE OUT
IC2
IC4
IC3,Q153
SP OUT
REAR
J4
RST
PAN IN SW
ANT-CONT.
P-CONT.
J2
Q370,371
Q450,451
Q50
Q350-353
Q58-61
Q54-57
Q53
Q320
Q301
Q51,52
J5
IC1
ED1
FM+B
Q200,201
AM+B
Q202,203
AM BPF
FM BPF
SW 5V
8V
ILLUMI.
B.U.5V
SYSTEM u-COM
RST SW
ANT-CONT.
FM ANT
AM ANT
RF GND
FM+B
AM+B
OSC GND
OSC GND
OSC GND
VT
PLL +B
IFC OUT
SDA
SCL
DIG GND
IF1+B
IF1 GND
S-METER
IF2 GND
SD
FM+B
SW5V
ACC DET
B.U. DET
SCL
MUTE
SDA
P CON
P
ANEL
HOLD
L
CLK
L
D
ATA
S
L
D
ATA
L
FWD/REV
MOT
OR
CH
CON
D
ATA
H
D
ATA
C
REQ
H
REQ
C
CH
CLK
Rch
COM
Lch
TAPE
MP IN
AM
MPX
OUT RR
OUT LR
OUT RF
Rch
LEVEL
SCL
SDA
OUT LF
Rch
STBY
MUTE
Rch
Lch
T-MUTE
FWD
REV
B.U.5V
B.U.
8V
B.U.
CHRST
S
MUTE
8
4
10
B.U.5V
AM+B
VDD 5V
P
ACK
IN
L
C
E
ANT CON
CHMUTE
BEEP
SVR
AMP. STBY
SVR
AC GND (BEEP)
Lch
Lch
Rch
Lch
1200mV
TAPE :1681mV
CD/MD-CH :3529mV
AM :546mV
FM :1781mV
8V
RF GND
OSC GND
IF2 +B
AUDIO OUT
8V
S-METER
SD
PLL CLK
PLL DATA
HEAD
PLAY
R
55.6mV
BU5V
SW5V
8V
B.U.5V
AM: 170mV
FM: 400mV
L
PACK IN
(FF/REW)
AMP. MUTE
FF/REW
BU5V
ILL
(X13)
M
KRC-19A/19G/289
KRC-289
KRC-289
F/E
MOTOR SW
Q260,261
ACC. DET.
5V
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3
KRC-19A/G,289
COMPONENT DESCRIPTION
Ref.No.
Component Name
Application/Function
Operation/Condition/Compatibility
IC1
LC75853E
LCD driver with key-matrix
Q
DTA114EK or UN2111
Key-matrix permission SW
Ready on key-matrix
Ref.No.
Component Name
Application/Function
Operation/Condition/Compatibility
IC1
LC72366-9592
System MI-COM.
System control
IC2
TDA7461ND
E-VOL. & N.C. MPX
Controls sound volume. Selects each source.
IC3
HD74HC27FP
Mute logic
3-input NOR gate x 3
IC4
TDA7384A
Power IC
Amplifies power so that the speaker
can drive audio signal.
IC5
LA3161
Equalizer amplifier
Equalizer amplifier for cassette tape sound
Q50
2SC2412K or 2SD601A
BACK-UP detection (Momentary
While BACK-UP is added, a base becomes Hi,
power down detection) SW
and Q50 is turned on.
Q51
2SB1443
BACK-UP 5V AVR
While BACK-UP is added, AVR outputs +5V.
Q52
2SC2412K or 2SD601A
Inverted Darlington connection.
Q53
DTA114YK
P.ON 5V SW
While a base becomes Lo, Q53 is turned on.
Q54
DTC144EK or UN2213
COM+B SW
Q55 is turned on while Q54's base becomes Hi.
Q55
DTA124EK or UN2112
Works during POWER ON mode.
Q56
2SB1548(P) or 2SB1565(E,F)
Q56 is turned on while Q57's base becomes Hi.
or 2SB1655(E,F)
COM+B AVR
Q57
2SC2412K or 2SD601A
Inverted Darlington connection.
Q58
DTC144EK or UN2213
Q59 is turned on while Q58's base becomes Hi.
Q59
DTA124EK or UN2112
ILLUMINATION +B SW
Works during POWER ON mode with a panel
attached to the set.
Q60
2SB1548(P) or 2SB1565(E,F)
Q60 is turned on while Q61's base becomes Hi.
or 2SB1655(E,F)
ILLUMINATION +B DRIVER
Q61
2SC2412K or 2SD601A
Inverted Darlington connection.
When BACK-UP detection SW or CHANGER
Q150
DTC124EK or UN2212
ELECTRIC VOLUME MUTE SW
RESET SW or MI-COM.'s mute works, a base
becomes Hi, and Q150 is turned on.
Q151
DTC114YK or UN2214
SVR DISCHARGE SW
When POWER IC RESET is activated, a base
becomes Hi, Q151 is turned on.
When BACK-UP detection SW or CHANGER
Q153
DTA124EK or UN2112
PRE OUT MUTE DRIVER
RESET SW or MI-COM.'s mute works, a base
becomes Lo, and Q153 is turned on.
Q200
DTC124EK or UN2212
FM +B SW
Q201 is turned on when Q200's base becomes Hi.
Q201
2SB1277(Q,R)
FM +B DRIVER
Works during FM reception mode.
Q202
DTC124EK or UN2212
AM +B SW
Q203 is turned on when Q202's base becomes Hi.
Q203
2SB1277(Q,R)
AM +B DRIVER
Works during AM reception mode.
Q260
DTC114YK or UN2214
MOTOR +B SW
Q261 is turned on when Q260's base becomes Hi.
Q261
2SB1443
MOTOR +B DRIVER
Works during TAPE mode.
Q301
DTA144EK or UN2213
CHANGER RESET SW
When a base becomes Lo, Q301 is turned on.
Q320
2SA1037K
PANEL 5V SW
While a panel is attached to the set,
a base becomes Lo, and Q320 is turned on.
Q350
2SB1277(Q,R)
P-CON. DRIVER
Q350 is turned on when Q353's base becomes Hi.
Q351
2SA1037K
P-CON. PROTECTION SW
Works when P-CON is being
short-circuited on GND.
Q352
DTA124EK or UN2112
P-CON. PROTECTION
Inhibits protection SW function when P-CON
INHIBIT SW
works momentary.
Q353
DTC114YK or UN2214
P-CON. SW
Q353 is turned on when a base becomes Hi.
Works during POWER ON mode.
Q370
2SB1277(Q,R)
ANT-CON. DRIVER
Q370 is turned on when Q371's base becomes Hi.
Q371
DTC114YK or UN2214
ANT-CON. SW
Works during TUNER mode.
When BACK-UP detection SW or CHANGER
Q450
DTC143TK or UN2216
PRE OUT MUTE SW(R ch.)
RESET SW or MI-COM.'s mute works,
a base becomes Hi, and Q450,451 are turned on.
Q451
DTC143TK or UN2216
PRE OUT MUTE SW(L ch.)
SWITCH UNIT(X13-965X-XX)
SYNTHESIZER UNIT(X14-6570-2X)
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Pin No.
Pin Name
I/O
Description
Processing Operation
1
XIN
I
Main clock resonator connection terminal
2
GND
-
TEST terminal 2
Connected to GND lines.
3
L DATA L
I
Data input from the LCD driver IC
4
L DATA S
O
Data output to the LCD driver IC
5
L CLK
O
Clock output to the LCD driver IC
6
L CE
O
CE output to the LCD driver IC
7
SDA
I/O
Data input/output with the E-VOL. IC
8
PLL DATA
I/O
Data input/output with the F/E
9
PLL CLK
O
Clock output to the F/E
10
SD
I
SD input from the F/E
Hi : Station detected
11
DATA C
I
Data input from changers
12
DATA H
O
Data output to changers
13
CH CLK
I/O
Clock input/output with changers
14
O
N.C.(Not used)
15
MOTOR
O
Cassette motor on/off output
Hi : Motor ON
16
SCL
O
Clock output to the E-VOL. IC
17-24
O
N.C.(Not used)
25
AM+B
O
AM+B ON/OFF output
Hi : during AM reception
26
FM+B
O
FM+B ON/OFF output
Hi : during FM reception
27
PACK IN
I
Cassette tape Pack-in detection input
Lo : Pack-in
28
FF/REW
I
FF/REW detection input
Lo : FF/REW, Hi : PLAY
29
GND
I
Connected to GND lines.
30
GND
I
Connected to GND lines.
31
VDD
-
VDD connection terminal
Connected to B.U. 5V lines.
32
REQ C
I
Request input from changers
Lo : Request
33
MUTE
O
Audio mute on/off output
Hi : Mute ON
34
CH CON
O
Changer control
Lo : Standby, Hi : ON
35
REQ H
O
Request output to changers
Lo : Request
When the momentary power down, after
36
SVR
O
Power IC reset terminal
ACC ON/OFF is detected and after POWER
OFF, the output becomes Hi temporarily.
37
AMP STBY
O
Power IC standby control output
Hi : POWER ON mode
38
AMP MUTE
O
Power IC mute control
Lo : Mute
39
P CON
O
Power control
Hi : POWER ON mode
40
ANT CON
O
Antenna control
Hi : during FM/AM reception
41
SW5V
O
SW 5V control
Lo : POWER ON mode
42
ILL
O
Illumination AVR ON/OFF control terminal Hi : POWER ON mode
43
O
N.C.(Not used)
44
BEEP
O
BEEP sound output
45-47
O
N.C.(Not used)
48
ROLL OFF
I
Roll off input
Pull down to GND lines. (Not used)
49
NOISE CANCELLER
I
Noise canceller input
Pull down to GND lines. (Not used)
50
SEL1
I
Destination input 1
Lo : KDC-19A/G, Hi : KDC-289
51
SEL2
I
Destination input 2
Pull down to GND lines. (Not used)
52
O
N.C.(Not used)
53
EQ MUTE
O
Tape equaliser mute on/off output
N.C.(Not used)
54
FWD/REV
I
FWD/REV detection input
Lo : REV mode
55
O
N.C.(Not used)
56
REMO
I
Data input from the remote control light
Pull down to GND lines. (Not used)
sensor
57-60
O
N.C.(Not used)
61
ACC DET
I
ACC detection input
Hi : ACC ON
4
MICROCOMPUTER'S TERMINAL DESCRIPTION
9
KRC-19A/G,289
¶ Terminal Description IC1 : MI-COM. (X14-)
background image
5
KRC-19A/G,289
MICROCOMPUTER'S TERMINAL DESCRIPTION
TEST MODE
Pin No.
Pin Name
I/O
Description
Processing Operation
62
B.U.
DET
I
Momentary power down detection input
Hi : When momentary power down detected
or B.U. OFF, Lo : B.U. ON
63
S METER
I
S-meter input from the F/E
64
PANEL
I
Panel detaching detection input
Lo : Panel not detached
65
GND
I
Connected to GND lines.
66
GND
I
Connected to GND lines.
67
HOLD
I
MI-COM. HOLD input
Lo : Hold
68
VDD
-
VDD connection terminal
Connected to B.U. 5V lines.
69
GND
I
Connected to GND lines.
70
GND
I
Connected to GND lines.
71,72
O
N.C.(Not used)
73
VDD
-
VDD connection terminal
Connected to B.U. 5V lines.
74
GND
I
Connected to GND lines.
75
GND
I
Connected to GND lines.
76
VSS
-
Ground connection terminal
Connected to GND lines.
77,78
O
N.C.(Not used)
79
GND
-
TEST terminal 1
Connected to GND lines.
80
XOUT
O
Main clock resonator connection terminal
1. How to enter the test mode
· Reset the unit while holding the "FM" key and preset "6" key.
· All indication segments go ON at the beginning of the test mode.
2. How to release the test mode
· Simply reset the unit.
· (NOTE) The test mode is not canceled by ACC OFF, power OFF, momentary power down or the panel off.
3. Audio adjustment
· Set the volume level to -10dB (which is shown as "30" on the display).
· Loudness OFF.
· The BASS / TREBLE and BALANCE / FADER controls can be set to the full boost / full cut and full right / full left and full
front / full rear respectively by pressing the "Track Up" / "Track Down" keys.
· Sound coordination doesn't appear for the feed.
¶ Terminal Description IC1 : MI-COM. (X14-)

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