© 2002-8 PRINTED IN JAPAN
B51-7967-00 (N) 1459
FM STEREO MODULATOR
KCA-R70FM
SERVICE MANUAL
AN
T.
PO
W
ER
IN
PU
T
DIS
P.
IN
PU
T
IN
PU
T
CO
NT
RO
LLE
R
FM
ST
ER
EO
MO
DU
LAT
OR
FR
EQ
UE
NC
Y:(M
Hz)
87.7
/ 87
.9/
88.1
/ 88
.3 /
88.5
88.7
/ 88
.9 /
89.1
/ 89
.3 /
89.5
89.7
/ 89
.9
KE
NW
OO
D
CO
RP
OR
ATIO
N
MADE
IN
JA
PAN
SR
C
PW
R
OF
F
SRCH/
MENU
1
2
3
4
5
6
SC
AN
RD
M
RE
P
M.R
DM
DIS
P
SIZE AAA BATTERY
(NOT SUPPLIED)
Panel assy
(A64-3096-08)
DC cord assy
(E30-4733-08)
Cord with plug (ANT)
(E30-4310-08)
Metallic cabinet
(A01-2819-08)
Cord with din connector
(E30-4309-08)
Remote controller assy
(A70-2039-05)
Unit holder
(J19-5236-08)
Accessory
(W01-0763-08)
RC-513
2
BLOCK DIAGRAM
CN101
DRIVER
RESET
Q101,201
ACC
BATT
GND
DETECTION
ACC
(+6.6V)
AVR
u-COM
IC2
IC1
CN1
Q1,6
Q4,5
VDD
HOLD
P ON
PLL
54
31
67
8-13
36
45
29,30,60
75,78
IC1
LCD DRIVER
LCD1
15-18,27,56
96-100
CN101
CN1
1-70
RL1
CN105
RADIO
To
CN104
ANT IN
Q310
MODE 1,2
CH-CONTROL
Q306,
RIPPLE
FILTER
307
MIX
PILOT
STAGE
RF
IC301
MODULATOR
FM-St.
Q304,305
LEVEL CONTROL
AUDIO MUTE
Q309
ALC
DETECTION
IC302
AMP
DRIVER
ALC
MPX
EMPHASIS
IC4
AVR(+5.6V)
MODE 1,2
Q308
CD-CH
13P
IC101
ISOLATION
AMP.
L.P.F.
2nd.
IC102
+V(AUDIO)
+V(RF STAGE)
SIGNAL
(L/R)
CN102
KEY MATRIX
71-75,77-80
VDD
IC2
REMOTE
SENSER
85
84
+5.2V
KCA-R70FM
3
COMPONENTS DESCRIPTION
q RF MODULATOR UNIT
Ref. No.
Component Name
Appication / Function
Operation / Condition / Compatibility
IC1
UPC78M06AHF
BU 5V AVR
While BACKUP is applied, AVR outputs +5V.
IC2
LC72366-9B28
System MI-COM.
System control
IC4
NJM78L05UA
5V AVR
Power supply for FM modulator and RF amplifier
IC101
NJM2060M
Isolation amp.
IC102
NJM4565MD
Low pass filter
IC301
BA1405F
FM ST modulator
IC302
NJM4565MD
1/2 VCC driver,
ALC detection amp.
Q1
DTC124EK
ACC detection
When Q4 is turned on , Q1 is turned on during ACC applied.
Q2
2SA1782(T,U)
POWER SW
When Q3's base goes "Hi", Q2 is turned on, and RF modulator circuit is
Q3
DTC124EK
working.
Q4
DTC143TK
Reset SW
When RESET SW on display unit is pressed, Q4,Q1 and Q6 are turned off,
and IC2 is holding.
Q5
DTC143TK
CH RESET SW
When RESET SW on display unit is pressed, Q5 is turned off, and
SYSTEM RESET signal is outputted to CD changer.
Q6
DTA124EK
Hold detection SW
When RESET SW on display unit is pressed or ACC is OFF, Q6 is turned
off, and IC2 is holding.
Q8
DTC143TK
Relay driver
FM modulator output / Vehicles antenna input switching.
When a base goes "Hi", FM modulator output is selected.
Q9
2SC4640(T,U)
Ripple filter
Power supply for RF amplifier
Q101
2SK2158
ALC control SW
Q201
2SK2158
Q303
2SA1162(GR)
Pilot mix amp.
Q304
2SK2158
Level control SW
Level 1/2 : OFF, Level 3/4 : ON
Q305
2SK2158
Level control SW
Level 2/4 : OFF, Level 1/3 : ON
Q306
2SK508L
RF oscillator buffer
Q307
2SC2714(Y)
RF amp.
Q308
2SK2158
Mode (1/2) SW
Mode1 : ON, Mode2 : OFF
Q309
2SK2158
Audio mute
POWER ON mode : OFF, POWER OFF mode : ON
Q310
2SK2158
Mode (1/2) SW
Mode1 : OFF, Mode2 : ON
q CONTROL UNIT
Ref. No.
Component Name
Appication / Function
Operation / Condition / Compatibility
IC1
LC75808W
LCD driver with key-matrix
IC2
RS-21N
Remote control light senser
Q1
2SD2114K
LED ON/OFF SW
Q2
DTA144EK
Key-matrix permition SW
Ready on key-matrix
Q3
DTA144EK
IC2 ON/OFF SW
KCA-R70FM
4
MICROCOMPUTER'S TERMINAL DESCRIPTION
q SYSTEM MICROCOMPUTER (IC2 : RF MODULATOR UNIT)
Pin No.
Pin Name
I/O
Terminal name
Description
Operation in HOLD
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-Chenger REQC (Active "Low")-
9
PF1
O
REQH
CD-Chenger REQH (Active "Low")H
10
PF0
O
CHCON
CD-Chenger ON
L
11
SI2
I
CH_DATA_C
CD-Chenger DATA in
-
12
SO2
O
CH_DATA_H
CD-Chenger DATA out
L
13
SCK2
O
CH_CLK
CD-Chenger 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
-
KCA-R70FM
5
Pin No.
Pin Name
I/O
Terminal name
Description
Operation in HOLD
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
-
q LCD-DRIVER (IC1 : CONTROL UNIT)
Pin No.
Pin Name
I/O
Terminal name
Description
Operation in HOLD
82
P1
O
KEY-ON
PANEL key matrix compulsory ON control terminal
L
83
P2
O
NC
Not used (open)
L
84
P3
O
ILLMI
Display panel illuminations Control terminal
L
85
P4
O
REMO-ON
Power supply control terminal for remote control
H
MICROCOMPUTER'S TERMINAL DESCRIPTION
ADJUSTMENT
RF MODULATOR UNIT
1. DC balance adjustment (VR301)
While observing the waveform with an oscilloscope at pin
13 of IC301, adjust VR301 to minimize the waveform level.
2. PLL control voltage adjustment (VC301)
First set the transmission frequency to *87.9MHz with the
commander, then adjust VC301 so that the DC Voltage at
the + pole of C317, measured using a multi-meter or digi-
tal tester, is +3V (
±0.1V).
* Note : E type is 87.7MHz.
3. Modulation level adjustment (VR303)
The method uses a standard receiver or tuner.
Adjust VR303 so that the output level from the standard
receiver or tuner is as specified.
KCA-R70FM