Kenwood KCAR-71-FM Service manual
FM MODULATOR
KCA-R7 1FM
SERVICE MANUAL
Cord with plug
(E30-6376-08)
DC cord assy
Panel assy
K type : (A64-3412-08)
E type : (A64-3414-08)
P
W
O
SR
R
F
F
C
S
R
C
H
/ M
E
N
U
1
S
C
A
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2
R
D
M
3
R
E
P
4
5
(E30-6377-08)
M
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D
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P
INPUT
© 2004-2 PRINTED IN JAPAN
B53-0149-00 (N) 2438
Metallic cabinet
K type: (A01-2850-08)
E type: (A01-2852-08)
POW
ER
KENWOOD CORPORATION
8
8
8
.7
8
9
.7
/8
MADE IN KOREA
C
O
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F
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INPUT
DISP.
INPUT
Remote controller assy
K type: (A70-2051-05) (RC-535)
E type: (A70-2052-05) (RC-525)
Unit holder
(J19-7009-08)
Size AAA battery
(Not supplied)
Antenna adaptor
(T90-0512-05)
(E type only) (E type only)
Velcro
(W01-1633-08)
Serew
(N99-1755-08) x2
Antenna adaptor
(T90-0521-05)
2
KCA-R7 1FM
BLOCK DIAGRAM
KCA-R7 1FM
COMPONENTS DESCRIPTION
● CONTROL UNIT
Ref. No. Application / Function Operation / Condition / Compatibility
IC701 LCD Driver with Key-matrix
IC702 Remote Control Light Sensor
Q701 LED ON/OFF SW
Q702 Key-matrix Permission SW
Q703 Remote Control ON/OFF SW
● FM MODULATOR UNIT
Ref. No. Application / Function Operation / Condition / Compatibility
IC101,102 GND Isolation AMP
IC103 Low Pass Filter
IC301 FM Stereo Modulator
IC302 1/2 Vcc Driver, ALC Detection Amp
IC501 System µcom
IC601 6V AVR
Q102 L/R Mixer SW D.cont off : L, D.cont on : H
Q103,203 ALC Control SW
Q151,251 Pre-out Mute
Q152,153 Pre-out Mute Control
Q301 Composite Buffer
Q351 Temperature compensation
Q303,304 Level Control SW LEVEL 1/2 : L, LEVEL 3/4 : H, LEVEL 2/4 : L, LEVEL 1/3 : H
Q305 Audio Mute Power on : L, Power off : H
Q401,402 PLL Low Pass Filter
Q411 RF Amp
Q501 Changer Reset SW
Q502 Reset SW
Q601,602 Display Unit Power SW
Q603 Backup 5V AVR
Q604,605 Power SW
Q606 8V AVR
Q607 Relay Driver
Q608 ACC Detection
Q609 Hold Detection
3
KCA-R7 1FM
MICROCOMPUTER’S TERMINAL DESCRIPTION
● SYSTEM MICROCOMPUTER : LC72366-9B63 (FM MODULATOR UNIT : IC501)
Pin No. Pin Name I/O Terminal name Description
1 XIN I X IN X_tal 2 TEST2 - GND Ground connection terminal 3~5 PG3~1 O NC Not used (pull down to GND lines.) L
6 PG0 I GND Connected to GND lines. 7 PF3 O NC Not used (open) L
8 PF2 I REQC CD-Changer REQC (Active “Low”) 9 PF1 O REQH CD-Changer REQH (Active “Low”) H
10 PF0 O CHCON CD-Changer ON L
11 SI2 I CH_DATA_C CD-Changer DATA in 12 SO2 O CH_DATA_H CD-Changer DATA out L
13 SCK2 O CH_CLK CD-Changer DATA SCK (Active “Low”) H
14 PE0 O NC Not used (open) L
15 PD3 O LCD DATA out LCD Driver DATA out L
16 PD2 O LCD CLK LCD Driver CLK out L
17 PD1 O LCD RESET LCD Driver RESET out L
18 PD0 O LCD CE LCD Driver CE out L
19~26 PC3~PB0 O NC Not used (open) L
27 PA3 I LCD DATA in LCD Driver DATA in 28~30 PA2~0 I NC Not used (pull down to GND lines.) 31 VDD - Vdd 5V 32 PQ0 O NC Not used (open) L
33~44 PP3~PN0 O GAIN12~1 Modulation output switching L
45 PM3 O SEP-ATT When it has GAIN5 output, “Hi” output L
46~52 PM2~PL0 O NC Not used (open) L
53 PK3 O RELAY Antenna relay control output terminal L
54 PK2 O P-on P_ON L
55 PK1 O MUTE Mute output terminal for the Tuner frequency change L
56 INT0 I REMOCON Remote controller signal input
57~60 PJ3~0 O NC Not used (open) L
61~66 PI1~PH0 I NC Not used (pull down to GND lines.) 67 HOLD I HOLD ACC detection (Operation in HOLD “Low”) L
68 SNS I Vdd Vdd 69 LCTR I NC Not used (pull down to GND lines.) 70 HCTR I NC Not used (pull down to GND lines.) 71 EO3 O NC Not used (open) Hi-Z
72 SUBPD O NC Not used (open) Hi-Z
73 VDD - Vdd Vdd 74 AMIN I NC Not used (pull down to GND lines.) 75 FMIN I VCO in VCO input -
Operation in HOLD
4
KCA-R7 1FM
MICROCOMPUTER’S TERMINAL DESCRIPTION
Pin No. Pin Name I/O Terminal name Description
76 VSS - Vss Vss 77 EO2 O NC Not used (open) Hi-Z
78 EO1 O Error out Phase Detector Error output Hi-Z
79 TEST1 - NC Not used (pull down to GND lines.) 80 XOUT O X-out X-tal
Operation in HOLD
ADJUSTMENT
Instrument :
SSG, OSC (5MHz), AC VOLTMETER, PWR SUPPLY, H/UNIT, CD-CH
RECEIVER
No. ITEM INPUT SETTINGS OUTPUT SETTINGS (MODULATOR)
FREQ
ALIGNMENT
POINTS
ALIGN FOR FIG.
L/R Balance CD-CH cignal off
1
2
(Scope Setting Condition for L/R BAL. Adj.)
1. VOLTAGE RANGE : 5mV
2. TIME/DIV : 50µs
Adj. (Tr No.29 or Pause)
Moduration
level Adj.
(Before Adj.) (After Adj.)
1. Ref.FM 1kHz 80dBµV Connect a
Stereo, CD-CH Tr No.1 AC voltmeter 88.3MHz VR302
2. D.Cont Off MOD Lv:2 to Receiver PreOut
Connect a
Oscilloscope 88.3MHz VR301 Min Level (a)
to Q301 Base.
Difference between
FM and a CD-CH
level is adjusted to
(-0.5±1.0dB).
* After Adj. The glue is applied to VR301, VR302.
Adjusted to be
min level point
Fig. (a)
5
A B C D E
KCA-R7 1FM
1
PC BOARD (COMPONENT SIDE VIEW)
FM MODULATOR UNIT
C317
STK402
R202
C202
C205
2
R204
C203
3
C212
4
5
C218
C220C301
VR301
C153
6
Q152
R152
EB EB
Q151
R154
R155
7
C154
D201
5
8
R207
R205
5
R208R209
8
R327
R220
X301
EB
R254
R255
C254
R210
C207
R212
C209
C208
R213
5
8
Q102
C214
R215
R217
GDS
GDSGDS
Q203
1
7
R304
C303
C302
C253
EB
Q153
R153
Q251
R252
RL
C105
R104
D101
IC102 IC101
R110
IC301
R303
4
1
4
1
C107
C108
4
IC103
1
R116
14
8
C308
VR302
R151
STK101
LINE OUT
R203
R102
C102
R103
14
C103
C104
R107
R105
C313
R108R112
R109C109
R113
C112
R115
C114
R120
R118 R117
Q103
R306
R309
R311
BE
Q301
R314R307
C307
C309
R308
R356
C405
C402
R405
J403
J402
13
912
C506
5
4
IC302
8
1
C315
R325
C314
D301
R322
R121
R323
C115
C118
C120
R310
D
R318
R316
D
R353
D
Q305
C304
R302
R301
C401
EB
R406
R404
R402
C403
C411
J401
C412
C404
R413
C413
85
R324
C306
GS
GS
BE
GS
VC401
C106
Q304
Q303Q351
R352
R355
R321
Q401Q402
EB
R411
Q411
EB
R451
R414
R552
C552
R501
R536
C521
25
40
C602
R351
R401
R407
R403
R412
C416
C414
C418
C415
C551
R551
BE
Q502
R502
EB
R503
Q501
R516
R515
C518
C519
C520C504
ZD518
24
41 54
L601
C312
PN601
C417
C451
C421
C419
C420
R514
C517
R513
C566
ZD516
3
RY401
3512
6
R512
C565
C564
ZD515
ZD514
IC501
C603
D602
D601
D603
C607
R511
R534
1
STK401
R521
C563
C562
ZD513
ZD603
R517
C561
ZD512
Q601
Q606
C608
R614
R613
ZD511
BE
R601
Q605
874
R520
R518
R519
R531
C501
C502
1
80
55
R617
C522
BE
Q603
R603
C651
ZD601
G
IC601
R602
R608
R607
D604
Q607
EB EB
BE
R611 R612
EB
PN302
3
D605
R522
C505
SC501
C652
R651
BE
Q609Q608
BE
IO
BE
C604
ZD602
R604
R605
R606
Q604
LUG1
1
PN301
1
2
X501
Q602
FM MODULATOR UNIT
Ref. No. Address
IC101 3B
IC102 3B
IC103 4B
IC301 4B
IC302 3B
IC501 3C
IC601 4D
Q102 4B
Q103 4B
Q151 6A
Q152 6A
Q153 6B
Q203 4B
Q251 6B
Q301 4B
Q303 5C
Q304 4C
Q305 5B
Q351 5C
Q401 6C
Q402 6C
Q411 6C
Q501 2C
Q502 2C
Q601 5D
Q602 5D
Q603 4D
Q604 5D
Q605 5D
Q606 5D
Q607 5D
Q608 4D
Q609 4D
Refer to the schematic diagram for the values of resistors and capacitors.
6
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