Kenwood KRC-435 User manual

SRC
KRC-435
47Wx4
DOLBY B NR
SCAN B.S/RDM REP MTL/M.RDMB NR NAMEDISP
AUD
MENU
PROG
DAB
OFF
LOUD
AMEAUTO
©2001-12 PRINTED IN JAPAN
B51-7877-00 (S) 1757
SERVICEMANUAL
CASSETTE RECEIVER
KRC-435/665
∗Front glass
(B10-4188-01)
Knob(SRC)
(K25-1410-03)
●KRC-435
Lever
(D10-4589-04)
DC cord
(E30-4784-05)
MECHANISM EXTENSION CORD
W05-0477-00 (7P)
W05-0609-00 (10P)
∗Refer to the PARTS LIST
Plastic cabinet assy
(A02-1486-13) Mounting hardware assy (J21-9716-03)
Screw set
(N99-1719-05)
Remote controller assy RC-410
(A70-2025-05) Screw set
(N99-1656-05) ∗Escutcheon
(B07-3060-02)
Knob(VOL)
(K25-1414-03) ∗Panel assy
(A64-2610-02)
Knob(1-6)
(K25-1409-03)
Knob(FM,AM)
(K25-1412-03)
Knob(ATT)
(K25-1411-03)

KRC-435/665
2
BLOCK DIAGRAM
DIMMER
TEL MUTE
ACC
ANT CON
P CON
BACK UP
WIRED
FM+B
BUFFER
BUFFER
DECODER
RDS
IC7
IC2
E-VOL
MPX
N.C.
AM+B
SYSTEM u-COM
IC1
KEY
MATRIX
RESET
SW
LCD
DRIVER G/R SW
RESET
IC8
IC1
DRIVER
SUB MOT
IC10
MAIN MOT
AVR
VOLTAGE
LIMITTER
ILL AVR
A 8V
Q16,17
SW14V
DIMMER
ACC DET
TEL MUTE
P CON
B.U DET
ANT CON
SW5V
B.U.5VP-5V Q11,12
POWER IC
THERMO
PROTECT
IC4
IC3
MUTE LOGIC
DRIVER
MUTE
Q1-4
SP OUT
1.8V
LCD
ANT.
Q31
Q61
Q39
Q32,33
Q34-36
Q38
Q13
Q14,15
Q23
Q72
Q18,19
Q3,4
Q44
Q55
Q54
Q52
REMO
REMO
PRE OUT
PANEL
DET EJECT ILL
DSI
KEY
EJECT
TH1
IC2
S1
ED1
IC9
251mV (E TYPE)
460mV (K TYPE)
FM :
1200mV
388mV
AM : 230mV
TUNER
MECHA
CD-CHANGER
MD-CHANGER
(X16- )
DOLBY EQ
CASSETTE
AUDIO
S-METER
PLL DATA
PLL CLK
SW 5V
FM
AM
TAPE
CHANGER
S METER
QUAL
SDA SCK
S MUTE
A 8V
SUB-
MOT+B
SUB+
PACK IN
F/R
T-END
STBY
HEAD COM
HEAD L
HEAD R
MODE
SUB +
RCLK
QUAL
RDATA
S METER
IFC
PLL DATA
PLL CLK
MUSIC
MS CONT
F/R
T-MODE
PACK IN
M-STBY
T-END
METAL
EQ-MUTE
DATA C
CH RST
CH MUTE
DOLBY
DATA H
CH CON
CH CLK
REQ H
REQ C
SUB - RESET MOTOR ILL ON
AM+B
FM+B
SCK
SDA
PRE MUTE
MUTE
BEEP
P MUTE
ACC DET
PHONE
DIMMER
P CON
P-5V
P ON
ANT CONT
B.U DET
SW 5V
3
2
5
CH MUTE
CH RST
DATA H
DATA C
CH CON
REQ C
CH CLK
REQ H
BACK UP
8
SW 5V
2
B.U. 5V
2
SUB-
SUB+
MOT+B
A 8V
PAN 5VB.U. 5V
SW 5V
MUTE AUX IN
BACK UP
SW 5V
B.U. 5V
B.U. 5V CH
FM 1800mVTAPE
AM 3600mV 855mV
1372mV 600mV
3600mV
1800mV
E TYPE K TYPE
1800mV
NOISE
AFS
AFS
IFC OUT
2
SW 5V
5
MS MODE
TAPE SW
NR SW
MUTE SW
MS OUT A 8V
REMO L DATAS L CLK DIM CON L CE L DATAL L-CLK PANEL-DET EJECT-ILL/DSI EJECT
MODE+B
6

KRC-435/665
3
COMPONENT DESCRIPTION
●SYNTHESIZER UNIT (X14-68XX-XX)
Component Purpose • Function Operation • Conditions • Compatibility
IC1 SYSTEM µ-COM
IC2 E-VOL, N.C. NPX
IC3 Mute logic circuit 4 input NOR gate x 4
IC4 Power IC
IC7 RDS Decoder
IC8 Reset IC "L" detection voltage: 3.0 V or less
IC9 Equalizer amplifier DOLBY B
IC10 Sub motor driver
IC11 EEPROM
Q1 Audio mute SW Front L-channel is muted when base goes "H".
Q2 Audio mute SW Front R-channel is muted when base goes "H".
Q3 Audio mute SW Rear L-channel is muted when base goes "H".
Q4 Audio mute SW Rear R-channel is muted when base goes "H".
Q11,Q12 B.U. 5V AVR Darlington connection
Q13 SW 5V ON when base goes "L".
Q14,Q15 SW 14V Audio 8V ON/OFF SW
Q15 is turnd ON when Q14's base goes "H".
Q16,Q17 AUDIO 8V AVR Darlington connection
Q18,Q19 Main motor SW Q19 is turnd ON when Q18's base goes "H".
Q20,Q21 ILL power ON/OFF SW Q21 is turnd ON when Q20's base goes "H".
Q23 ILL AVR Inverted darlington connection
Q31 Dimmer control SW Small light detection when base goes "H".
Q32,Q33 Power antenna SW Q33 is turnd ON when Q32's base goes "H".
Q34,Q37 Power control SW Q34 is turnd ON when Q37's base goes "H".
Power control circuit When the output voltage decrease is detected, Q37 is turned off to protect the output.
Q35,Q36
output protection When the power control switch is turned on, Q35 protects the system from
misoperation.
Q38 B.U detection "L" when B.U is present.
"H" when B.U is absent or when momentary power down detction.
Q39 ACC detection "L" when ACC is present.
Q42 Mute driver For driving the audio mute switch.
ON when the base goes "L".
Q43 MUTE SW for E-VOL. Turns on when base goes "L" and E-VOL is muted.
Q44 Noise buffer
Q51,Q52 FM+B SW Q52 is turnd ON when Q51s base goes "H".
Q53,Q54 AM+B SW Q54 is turnd ON when Q53s base goes "H".
Q55 Composite signal buffer
Q61 PANEL 5V SW ON when the base goes "L".
Q71 MSTC SW ON when the base goes "H".
Q72 Sub motor AVR 7.3V output when AUDIO 8V is turned on.
Q82 EJECT ILL/DSI SW ON when the base goes "L".
●SWITCH UNIT (X16-16XX-XX)
Component Purpose • Function Operation • Conditions • Compatibility
IC1 LCD driver
IC2 Remocon IC
Q1 Key scan start SW ON when the base goes "L".
Q2 Remocon IC VDD supply SW Supply of Remocon IC VDD when the base goes "L".

KRC-435/665
4
●IC1(SYNTHESIZE UNIT : X14-68XX-XX)
Pin No. Pin Name I/O Description Processing Operation
1 TYPE 1 I Destination type selection port
2 TYPE 2 I Destination type selection port
3 IFC I F/E IFC OUT input terminal H: Station exists Vth: 2.5V
4 AVSS - A/D,D/A converter ground connection terminal Connected to GND lines.
5 IC2-TYPE 1 I Maket/genuine select (Noise cancel) L: Maket H: genuine
6PANEL-DET I Panel detection L: Panel exists H: Panel does not exists
7 AVREF1 I D/A converter reference voltage input terminal Connecting to BU5V
8 CH-DATAC I Data input from changers
9 CH-DATAH O Data output to changers Last maintenace
10 CH-CLK I/O Clock input/output with changers input
11 L-DATAL I Data input from the LCD driver IC Communication speed 600kHz (max)
12 L-DATAS O Data output to the LCD driver IC Communication speed 1.2MHz (max)
L: Panel detached
13 L-CLK O Clock output to the LCD driver IC L: Panel detachd
14 L-CE O LCD driver chip enable H: Driver select L: Not select
15 BEEP O BEEP sound output
16 PLL-DATA I/O Tuner (01ST) data input/output Last maintenace
17 FLIP-DET I Panel detach detection L: Panel attached H: Panel detached
18 PLL CLK O Tuner (01ST) clock input/output
19 N.C. O Not used
20 EJECT ILL/DSI O EJECT ILL KEY & DSI output L: Light ON H: Light OFF
21 L-RST O Reset output to the LCD driver IC L: Reset ON H: Reset OFF
22 PAN 5V I/O Panel 5V control terminal L: ON (Panel exists & ACC ON)
H: OFF (Panel does not exists or ACC OFF)
23 R-DATA I Data input from the RDS decoder IC
24 R-QUAL I Quality input from the RDS decoder IC
25 SUB (-) O Sub motor output (-)
26 SUB (+) O Sub motor output (+)
27 FWD/rev I Cassette tape running direction detection H: FWD L: REV
28 MS-CONT O ADV sensitivity control H: PLAY L: FF/REV
29 metal O NORMAL/METAL change H: NORMAL L: METAL
30 EQ-MUTE O EQ-MUTE change H: ON L: OFF
31 DOLBY O Dolby ON/OFF H: ON L: OFF
32 music I Casstet music space detection H: Music does not exists L: Music exist
33 VSS1 - GND
34 IC2 TYPE 0 I Maket/genuine select 0 (ROLL-OFF) L: Market L: Genuine 0
35 AM+B O AM power supply terminal H: During AM reception
36 FM+B O FM power supply terminal H: During FM reception if with RDS
37 AFS O Noise detection time constant switching terminal Hi: During FM reception, Lo: During FM seek or
AF search
38 IC2-CLK O IC2 clock output
39 IC2-DATA I/O IC2 data input/output
40 EEPROM DET I EEPROM detection terminal H: EEPROM exist L: EEPROM does not exists
41 P-MUTE O Power IC mute control output H: Mute OFF
L: Mute ON, PowerOFF, All OFF, TEL Mute
42 P-STBY O Power IC standby control output L: Power IC OFF, All OFF mode
H: Power IC ON
43 MUTE O IC2 mute control output H: Mute ON L: Mute OFF
44 PRE MUTE O Pre-out mute control L: Momentary power down, Reset
45 DIMMER-CON O Dimmer Control Control with pulse output H: Power ON
L: Power OFF
46 BU-DET I Momentary power down detection input H :BU OFF L : BU ON
47 ACC-DET I ACC detection input L: ACC ON H: ACC OFF
48 dimmer I Small lights detection input L: ON H: OFF
49 REMO I Data input from the remote control light sensor
50 ANT-CON O Antenna control output H: TUNER, TI
MICROCOMPUTER'S TERMINAL DESCRIPTION

KRC-435/665
5
MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Pin Name I/O Description Processing Operation
51 P-CON O Power control output H: Power ON L: Power OFF
52 CH-RECH O Request output to changers L: Request
53 CH-RST O Reset output to changers L: Normally
54 CH-MUTE I Mute request from changers H: ON L: OFF
55 CH-CON O Changer control H: ON L: OFF
56 P-ON I/O SW 5V control output H: OFF L: ON
57 MOTOR O Main motor output H: ON L: OFF
58 M-STBY I Cassette standby detection H: STBY
59 T-END I Tape end detection H: Tape play L: Tape end
60 reset I Reset input terminal L: System reset H: Normally
61 eject I Eject key detection H: OFF L: ON
62 CH-REQC I Request input from changers H: OFF L: ON
63 ILL ON O Illumination output terminal H: ON L: OFF
89 KEY-REQ I Panel key interrupt input L: Key input exist
65 R-CLK I Clock input from the RDS decoder IC
66 PACK-IN I Cassette pack-in detection H: Pack-in
67 VSS0 - GND (port)
68 VDD1 - Positive power supply
69 X2 - Main clock output (12MHz)
70 X1 I Main clock input
71 TEST I Program power supply (Mask: Test terminal)
72 XT2 - Sub clock output (32.768MHz)
73 XT1 I Sub clock input
74 VDD0 - Positive power supply (port)
75 AVDD I A/D port reference voltage input
76 PHONE I Phone detection terminal Less than 1V: TEL mute
More than 2.5V: NAVI mute
77 T-MODE I Tape mode detection Vth=2.5V
78 S-METTER I S-meter input from F/E
79 NOISE I FM noise detection input
80 TYPE 0 I Destination type selection terminal