Kenwood KRC-13-RG, KRC-178-RA, KRC-178-RG, KRC-178-RYA, KRC-178-RYG Service manual
...
CASSETTE RECEIVER
KRC-13RG
SERVICE MANUAL
© 2000-1 PRINTED IN KOREA
B51-7587-00 (K) 2204
KRC-178RA/RG/R YA/R YG
KRC-23RA/RG
ANTENNA ADAPTOR
(T90-0523-05)
(Except KRC-280RG)
KRC-278RA/RG/R YA/R YG
KRC-280RG
KRC-278R
CD/MD-CHANGER CONTROL
KRC-23R
CD/MD-CHANGER CONTROL
KRC-13R
KRC-178R
KRC-280R
CD/MD-CHANGER CONTROL
KRC-13RG (E)
KRC-178RA/RG/RYA/RYG (E)
KRC-23RA/RG (E)
PLASTIC CABINET ASSY
(A02-1486-13)
LEVER
(D10-3031-04) x2
MOUNTING HARDWARE ASSY
(J21-9491-03)
DC CORD
(E30-xxxx-xx)
(Refer to the parts list.)
STAY
(J54-0606-04)
SCREW SET
(N99-1610-15)
(KRC-280RG only)
SCREW SET
(N99-1632-05)
(KRC-280RG only)
AUD
1
23456
CLK
ATT
SRC
PWR
OFF
SCAN RDM REP T.C/D.SCN M.RDM
LOUD
DISC
MENU
FM
AM
FF
REW
PR OG
VOL ADJ NAME SETTI
PTY
AUD
1
23456
CLK
ATT
SRC
PWR
OFF
SCAN RDM REP T.C/D.SCN M.RDM
LOUD
DISC
MENU
FM
AM
FF
REW
PR OG
VOL ADJ NAME SETTI
PTY
AUD
1
23456
CLK
ATT
SRC
PWR
OFF
SCAN RDM REP T.C/D.SCN M.RDM
LOUD
DISC
MENU
FM
AM
FF
REW
PR OG
VOL ADJ NAME SETTI
PTY
AUD
1
23456
CLK
ATT
SRC
PWR
OFF
T.CALL
LOUD
MENU
FM
AM
FF
REW
PR OG
VOL ADJTI
PTY
AUD
1
23456
CLK
ATT
SRC
PWR
OFF
T.C/ALL
LOUD
MENU
FM
AM
FF
REW
PR OG
VOL ADJTI
PTY
KRC-278RA/RG/RYA/RYG (E)
KRC-280RG (M)
(KRC-280RG only)
40%
2
IC1
KEY
PANEL 5V SW
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
ME1
MAIN
TAPE MECHA.
IC5
1 Lch
2 Rch
PRE OUT
IC2
IC4
IC3
SP OUT
REAR
J4
RESET SW
PAN IN SW
ACC DET.
P-CONT.
J2
J5
IC1
FRONT-END
J1
FM+B
Q201
AM+B
Q203
AM BPF
FM BPF
C154,157,R206
C153,156,R207
Q320
Q450,451
Q49
Q50
Q350-353
Q353
P-CON.SW
Q54-57
8V
Q58-61
ILLUMI.
B.U.5V
Q51,52
SYSTEM u-COM
S1
S2
S3
P-CONT.
CD-CH
RST SW
Q301
D1-15
PL1,2
ANT.
TEL MUTE
DECODER
RDS
IC7
Q501,502
MP SW
40W
RESET
IC6
ED1
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
P. O N
ACC DET
B.U. DET
SCL
MUTE
SDA
P. CON
PANEL
RESET
L CLK
L DATA S
L DATA L
FWD/REV
MOTOR
CH CON
DATA H
DATA 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
BU5V
8V
B.U.
CHRST
S MUTE
8
5
10
B.U.5V
AM+B
VDD 5V
PACK IN
L RES
PHONE
CHMUTE
BEEP
SVR
AMP. STBY
SVR
AC GND (BEEP)
Lch Lch
Rch
Lch
1200mV
TAPE :1681mV
CD/MD-CH :3529mV
AM :772mV
FM :1339mV
8V
RF GND
OSC GND
IF2 +B
AUDIO OUT
8V
S-METER
SD
PLL-SCL
PLL-SDA
M1
HD1
R
55.6mV
BU5V
SW5V
8V
B.U.5V
AM: 170mV
FM: 213mV
L
PACK IN
(FF/REW)
AMP. MUTE
FF/REW
BU5V
R QUAL
R CLK
R DATA
SW5V
MP OUT
QUAL
AFC
NOISE
BU5V
ILL
L CE
(X13)
M
KRC-13R,178R,23R,278R,280R (E,E,E,E,M)
A1
KRC-13R,178R,23R,278R,280R
BLOCK DIAGRAM
SYNTHESIZER UNIT (X14-613x-xx)
REF. No.
FUNCTION OPERATION
IC1 SYSTEM µ-COM Controls system.
IC2 ELECTRIC VOLUME Controls sound volume. Selects each source.
IC3 MUTE Controls each mute output.
IC4 POWER IC Amplifies power so that the speaker can drive audio signal.
IC5 EQUALIZER AMPLIFIER Equalizer amplifier for cassette tape sound.
IC6 RESET Resets power supply.
IC7 RDS DECODER Decodes RDS signal.
Q49 ACC DETECTION SW Works when ACC operation stops.
Q50 BACK-UP DETECTION SW Works when the back-up voltage comes less than 9.2V.
Q51,52 BACK-UP 5V DRIVER Works when the back-up works.
Q53 P.ON 5V SW Works when the power comes.
Q54,55 8V SW Works when the power comes.
Q56,57 8V DRIVER Works when the power comes.
Q58,59 ILLUMINATION +B SW Works when the power comes.
Q60,61 ILLUMINATION +B DRIVER Works when the power comes.
Q150 ELECTRIC VOLUME MUTE SW
Works when the back-up voltage detection or the changer mute or
µ-com mute works.
Q151 SVR FORCED DISCHARGE SW Works when the amplifier mute works.
Q153 PRE OUT MUTE SW
Works when the back-up voltage detection or the changer mute or
µ-com mute works.
Q201 FM +B SW Works when FM mode is being selected.
Q203 AM +B SW Works when AM mode is being selected.
Q260 MOTOR +B SW Works when TAPE mode is being selected.
Q261 MOTOR +B DRIVER Works when Q260 works.
Q301 CHANGER RESET SW Works when power supply is being reset and IC6 works.
Q320 PANEL 5V SW Works when the back-up works and panel is on the unit.
Q350 P-CON. DRIVER Stops during POWER OFF and ALL OFF modes.
Q351 P-CON. PROTECTION SW Works when P-CON is being short-circuited on GND.
Q352 P-CON. PROTECTION INHIBIT SW Inhibits protection SW function when P-CON works momentary.
Q353 P-CON. SW Stops during POWER OFF and ALL OFF modes.
Q450,451 PRE OUT MUTE SW
Works when the back-up voltage detection or the changer mute or
µ-com mute works.
Q500 AUDIO OUT BUFFER For RDS decorder (IC7).
Q501,502 AFC TIME CONSTANT SW Works when receiving FM signal. Stops when seeking FM signal.
Q503 NOISE BUFFER For noise level detection.
KRC-13R,178R,23R,278R,280R
COMPONENT DESCRIPTION
3
KRC-13R,178R,23R,278R,280R
(X14-) IC1 : µ-COM
PORT No. PORT NAME I/O FUNCTION OPERATING CONDITION
1
PANEL
I Panel on/off detection. "L" : Panel on. "H" : Panel off.
2 L CE
O LCD driver chip enable.
-
3
L RES O LCD driver reset.
-
4 AVSS - GND.
-
5
R DATA I RDS data.
-
6 R QUAL I
RDS signal.
-
7
AVREF 1 I
Reference voltage.
-
8 IC2 SEL 1 I To GND.
-
9
IC2 SEL 0 I To GND.
-
10 - - No connection.
-
11
L DATA L I LCD driver data.
-
12 L DATA S O LCD driver data.
-
13
L CLK O LCD driver clock.
-
14,15 - - No connection.
-
16
DATA C I
Changer data.
-
17 DATA H O
Changer data.
-
18
CH CLK
I
Changer clock.
-
19-26 - - No connection.
-
27
MOTOR O Cassette motor on/off.
-
28
FF/REW
I FF/REW.
-
29-31
- - No connection.
-
32 SD I
Tuner signal detection.
"H" : Tuner signal exists.
"L" : Tuner signal does not exist.
33
VSS 1 - GND.
-
34
- - No connection.
-
35
PLL CLK O PLL clock.
-
36
PLL DATA I/O PLL data.
-
37
AM+B O AM power supply.
-
38 FM+B O FM power supply.
-
39
IC2 DATA I/O E-volume data.
-
40 IC2 CLK O E-volume clock.
-
41
AFC O FM noise detection time constant switch.
-
42 MUTE O Mute control.
-
43 AMP MUTE O Power IC (IC4) mute.
-
44
- - No connection.
-
45 CH CON O
Changer control.
-
46
REC H
O Request to head unit.
-
47 - - No connection.
-
48
SVR O
Power IC (IC4) discharge control.
-
49 AMP STBY O
Power IC (IC4) stand-by.
-
50
BEEP O Buzzer.
-
51,52 - - No connection.
-
53
P.CONT O Power control on/off.
-
54
ACC DET I ACC detection.
-
55
B.U. DET I Back-up detection.
-
56
P.ON O Power on/pff.
-
57
ILL O Illumination on/off.
-
58
FWD/REV
I FWD/REV detection.
-
59
- - No connection.
-
60
RESET
I System reset.
-
61
SEL 1 I Destination switch.
-
62
R CLK I RDS clock.
-
63
REQ C
I
Request from changer.
-
64
PACK IN
I
Cassette tape Pack-in detection.
65
KEY-REQ I
Key detection.
-
-
66
SEL 0 I Destination switch.
-
67
VSS 0 - GND.
-
68
VDD 1 - VDD.
-
69
X2 -
Main system clock.
-
70
X1 -
Main system clock.
-
71
IC - GND.
-
72
XT2 -
No connection.
-
73
XT1 -
VDD.
-
74
VDD 0 -
VDD.
-
75
AVREF 0 I
Reference voltage.
-
76
S METER I
Signal meter.
-
77
PHONE I Tel/Navi mute.
Tel mute : Less than 1V.
Navi mute : More than 2.5V.
78
NOISE I FM noise detection.
-
79
AV CONT
O
A/D refernce voltage control.
-
80
--
No connection.
-
CIRCUIT DESCRIPTION
4
KRC-13R,178R,23R,278R,280R
TEST MODE
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 can be set to the full-boost/full-cut and full-
front/full-rear each by pressing the "Track UP" / "Track DOWN" keys.
• Sound coordination doesn't appear for the feed.
5
(2-LINE TAPE)
B
A
B
A
(FWD)
(RVS)
HEIGHT
(FWD)
HEIGHT/AZIMUTH
(FWD)
HEIGHT/AZIMUTH
(RVS)
TAPE SPEED
HEIGHT
(RVS)
F
''
F
R
R
KRC-13R,178R,23R,278R,280R
ADJUSTMENT/EINSTELLUNGEN (MECHA.)
Head Angle Adjustment
Head height alignment procedure
• During FWD transport adjust screws F and F' so that line A of 2-LINE
TAPE passes trough the center of the head shield plate (core center
area)
• During RVS transport adjust screws R and R' so that line B of 2-LINE
TAPE passes trough the center of the head shield plate core (center
area)
• After the alignment above, reverse the transport direction and check the
FWD alignment again. If it is deviated, perform alignment again. (Tape
used : SCC-1659, manufactured by A-BEX)
Einstellung des Kopfwinkels
Vorgehensweise bei der Kopfhöhen-Einstellung
• Während des Bandlaufs in Vorwärtsrichtung die Schrauben F und F' so
einstellen, daß die Linie A eines 2-Linien-Bands (2-LINE TAPE) durch
die Mitte der Kopfabschirmplatte (Zentrum des Mittelbereichs) verläuft.
• Während des Bandlaufs in Rückwärtsrichtung die Schrauben R und R'
so einstellen, daß die Linie B eines 2-Linien-Bands (2-LINE TAPE)
durch die Mitte der Kopfabschirmplatte (Zentrum des Mittelbereichs)
verläuft.
• Nachdem die obige Einstellung abgschlossen ist, die Bandlaufrichtung
umkehren und die Ausrichtung in Vorwärtsrichtung noch einmal
überprüfen. Wenn eine Abweichung festgestellt wird, ist diese
Einstellung zu wiederholen. (Verwendetes Band: SCC-1659, hergestellt
von A-BEX)
6
A BDFHJCEGI
R11
R13
R18
R17
R14
R9
C4
R2
R12
1
2
11
12
R4
R5
R3
R8
R21
1
80
R6
C1
R7
65
C3
C2
BE
64
24
25
40
41
R10
R15
D17
J1
IC1
Q1
D13
D10
D12
D11
D9
D6
D7
D8
D5
D4
D3
ED1
D14
D15
X13-964x-xx (J74-0962-02)
SWITCH UNIT
D2
D1
123
45
6
PL2
54 1
PL1
ATT
SRC
TICLK
RESET
AUD
AM
FM
W170
C251
R156
R15
W158
R14
R62
W159
R57
R59
W157
R60
C52
C163
R161
R159
R162
R16
R13
W174
R381
C380
R61
R251
R151
C214
R503
R125
R123
C13
C14
R58
R52
R54
R106
R112
C164
R352
C154
C153
C351
TH1
R504
R155
R154
R153
R322
R401
R400
R380
R408
R409
R407
R406
R412
R410
R411
R303
R302
R304
R306
R305
R403
R301
R402
C504
C54
C502 C505
R63
R64
W162
C501
R1
C1
R201
R203
R150
W153
C452
C202
C204
R455
R453
R454
R451
R450
R452
R205
R141
R2
C2
C5
R382
C6
C157
R111
R113
R404
R103
R108
C151
C156
C155
R160
R206
R207
C158
C506
R8
C8
R4
R6
R7
C7
R5
R133
R323
R110
R158
C101
C102
R105
C103
W161
W160
R48
R320
R321
R140
W173
W154
R124
R122
R152
R121
R117
R157
R405
R143
R104
W169
W168
W167
R3
R250
W165
R49
R413
W156
R142
W166
W164
R101
R102
C104
W163
BE
EB
BE
EB
BE
BE
EB
BEBE
EB
BE
BEBE
EB
EB
EB
BE
EB
BE
EBBEEB
EB
EB
EB
1
20
21
40 41
60
61
80
31
54
814
17
114
15 28
169
81
Q61
IC1
Q52
Q59
Q58
Q57
Q153
Q151
Q150
Q55
Q49
Q54
Q53
Q50
Q500
Q502
Q501
Q353
Q301
Q320
Q352
Q351
IC6
IC7
Q451
Q450
Q260
IC2
Q503
IC3
A1
Q60
Q56
D370
D410
D50
D405
D371
D352
Q51
Q350
D380
D401
D400
D56
D52
D51
D55
D54
D402
D408
D409
D403
D350
D351
D53
Q261
Q201
Q203
D404
D200
D260
P1
IC5
D261
J1
J5
J4
J2
J3
X14-613x-xx (J74-0958-22)
SYNTHESIZER UNIT
IC4
D150
D152
D151
WH1
D100
CN1
4.3320MHz
W24
W64
W76
W78
R200
R202
W36
R55
W73
W69
W12
W99
R67
W58
W104
C4
R350
R370
W67
W57
W70
C209
L10
W66
W68
W4
W6
W72
W71
W7
W85
W80
W39
W42
W45
W48
W50
W101
W102
W2
R51
R65
R351
R353
R66
X1
C50
C17
C18
C160
C152
C55
W15
C15
C16
C161
C350
C352
C503
C162
C500
C450
C451
C150
C159
C56
C58
C53
C57
W97
W98
W103
W53
W43
W51
W28
W10
X2
W17
R501
W3
R502
R500
R261
L5
R260
L4
C402
C400
C401
W54
W47
W95
W93
W89
R119
W13
W61
W62
W14
C9 C250
C10
W8
W9
W33
W23
W27
W30
W32
W37
W26
W55
W56
R263
R262
W22
W77
W63
W65
W21
R252
W105
W52
W100
W94
W96
W92
W91
W90
W87
W59
W60
W20
W25
W29
W31
W35
W19
W11
W82
W79
W83
W40
W38
W41
W84
W81
C3
W34
W18
W49
W46
W44
R120
W88
W74
W75
4.19MHz
TP
5V
DG
S-MTR
2DA
CCK
DTH
DTC
CMP
2CK
L1
RES
L8
L7
R100
L12
L6
L3
W5
R107
1
24
1
2
25
24
8
16
1
9
18
15
1
212
11
1
6
125
3
67
8
41113
109
12
1
2
BE
BBEE
B
BE
E
EBBE
PC BOARD (Component side view)
1
2
3
4
5
6
7
87
Refer to the schematic diagram for the value of resistors and capacitors.
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