KENWOOD KRCX838 Service Manual

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Service Manual for KENWOOD KRCX838, downloadable as a PDF file.

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© 2002-2 PRINTED IN JAPAN
B51-7926-00 (S) 2142
CASSETTE RECEIVER
SERVICE MANUAL
KRC-Z965,X838
qThis service manual does not include information on the cassette mechanism operation description.
For such information, please refer to the cassette mechanism assembly service manual (D40-1122-05: B51-7452-00).
Front glass
(B10-4216-01)
Panel assy
(A64-2653-11)
KRC-Z965
Front glass
(B10-4215-01)
Panel assy
(A64-2652-11)
X838
Antenna adaptor
(T90-0523/0534/0552-05)
Screw set
(N99-1723-05)
:KRC-Z965
Screw set
(N99-1656-05)
Lever
(D10-4674-04)x2
Mounting
hardware assy
(J21-9823-03)
Plastic
cabinet assy
(A02-2712-13)
Remote controller assy
(A70-2026-05)
Escutcheon
(B07-3050-02)
DC cord
(E30-6063-05)
background image
© 2002-2 PRINTED IN JAPAN
B51-7926-00 (S) 2142
CASSETTE RECEIVER
SERVICE MANUAL
KRC-Z965,X838
qThis service manual does not include information on the cassette mechanism operation description.
For such information, please refer to the cassette mechanism assembly service manual (D40-1122-05: B51-7452-00).
Front glass
(B10-4216-01)
Panel assy
(A64-2653-11)
KRC-Z965
Front glass
(B10-4215-01)
Panel assy
(A64-2652-11)
X838
Antenna adaptor
(T90-0523/0534/0552-05)
Screw set
(N99-1723-05)
:KRC-Z965
Screw set
(N99-1656-05)
Lever
(D10-4674-04)x2
Mounting
hardware assy
(J21-9823-03)
Plastic
cabinet assy
(A02-2712-13)
Remote controller assy
(A70-2026-05)
Escutcheon
(B07-3050-02)
DC cord
(E30-6063-05)
background image
KRC-Z965,X838
2
BLOCK
DIAGRAM
SDA
SCL
S-METER
SW5V
RDCK
FM
AM
SW5V
AUDIO OUT
BACK UP
DATA H
DATA C
MUTE
CH
SD
A
RDDA
BU5V
BU5V
DSI
EJECT
G
EJECT
R/G
(E) TYPE
TAPE
FM
AM
1512mV
866mV
3795mV
BU5V
PRE MUTE
PMUTE
PSTBY
MUTE
BEEP
AUX SW
TAPE/AUX
E-VOL OUT LEVEL
A8V
IFC OUT
SW5V
A8V
SCL
QUAL
AFS
SUB
M+
SUB
M-
MO
T
+B
FWD/REV Lch
FWD/REV Rch
Rch
Lch
A8V
A8V
A8V
REQ H
RST
REQ C
CH CON
CLK
A8V
A8V
+B
-B
BACK UP
BU5V
BU5V
MC
REQ
SC
CON
FL+B
RED
SI2
SI1
CLK
GREEN
KS1-KS4
KR1-KR5
F01-F06
WAVE
P5V
MC
CLK
SC
REQ
P
RST
MC
D
A
T
A
GCP
LA
T
P5V
REMO
FL+B
FAC
BK
P5V
A8V
+B
-B
MOT+B
FAC
FL+B
MI-COM
MI-COM
SW5V
MI-COM
BU5V
P5V
MI-COM
REMO
O-DATA
O-CE
O-CLK
1.8V PRE
476mV
676mV
1695mV
(M) TYPE
4.5V PRE
AUX
CHANGER
QU
A
L
E'S OUT LEVEL
PRE OUT LEVEL
MS OUT
DOLBY ON/OFF
MTL ON/OFF
MUTE
FWD/REV
MS MODE
F
REEL
R
REEL
MODE2
MODE1
MODE3
774mV
1377mV
(M) TYPE
(E) TYPE
CHANGER
FM
AM
AUX
TAPE
1695mV
476mV
676mV
774mV
4.5V PRE
3795mV
866mV
1512mV
1733mV
1.8V PRE
(M) TYPE
(E) TYPE
AM
FM
CHANGER
AUX
TAPE
3717mV
848mV
1481mV
1698mV
1.8V PRE
4469mV
1254mV
1781mV
2041mV
4.5V PRE
SUB M+
SUB M-
251mV
215mV
1200mV
AUX : 1200mV
TAPE : 388mV
CH
F/E
FM+B
PLL+B
AM+B
BUFF
E-VOL
MI-COM
DECODER
RDS
ISO
AMP
OEM
EJECT LED
DSI
DISP
4.5V PRE
DC/DC
2WAY MUTE
ACC DET
DIMMER
TEL-MUTE
ACC
DIMMER
POWER IC
PRE AMP
PRE OUT
SP OUT
MUTE
DRIVER
NOISE
BUFFER
P-CON
P-CON
IF+B
CASSETTE
MECHA
EQ
DOLBY
AUX
SW
OP AMP
E'S
SPEANA
AGC OP AMP
MUTE
4.5V
BU DET
BACK UP
EX AMP CONT
EX AMP CONT
NAVI MUTE
RESET
DET
PANEL
KEY ILL
MATRIX
KEY
FL
SW
MI-COM
PANEL
SPEANA
BPF
REMO
RESET
REG
SW
BUFFER
3.3V
SW
VOLTAGE
LIMITER
DRIVER
MAIN MOTOR
BOX
DC/DC
A8V
SW14V
DC/DC
REG
BU5V
SW5V
PANEL5V
Q43,44
Q45,46
Q52
IC14
IC1
IC2
Q36
IC8,Q34
IC5
Q37-42
IC10-12
IC4
Q32,35
IC7
Q15
Q31
Q30
Q14
Q26-29
Q3
Q51
IC3,Q4-6
IC6,Q16-23
Q602,603
Q24,605
A1
Q10-13
Q7,8
Q2,476
IC16
101
IC1
IC5
IC2
ED1
Q1,2
Q7-10
IC3
IC4
IC20
IC21
EEP ROM
IC25
Q47,48,
(E) TYPE ONLY
(M) TYPE ONLY
(M) TYPE ONLY
ANT-CON
SUB MOTOR
DRIVER
Q5
(M) TYPE ONLY
(E) TYPE ONLY
EXCEPT (M) TYPE
(E) TYPE ONLY
(E) TYPE ONLY
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KRC-Z965,X838
3
COMPONENT DESCRIPTION
q SWITCH UNIT (X16-1682-71)
Ref.No.
Component Name
Application/Function
Operation/Condition/Compatibility
IC1
TAR5S33
FL AVR
+3.3V Output
IC2
TC74HC4050AFT
Buffer
For FL control lines, 5V
3.3V logic level shifting
IC3
RS-171
Remote sensor IC
IC4
BA3830F
BPF IC
BPF for the spectrum analyser indicator
IC5
UPD703032GFA04
Panel MI-COM.
Q1
DTA144EUA or UN5113
FL+B SW
FL & Illumination AVR ON/OFF control. When Q2's base goes Hi, Q1
is turned on, and FL+B(45V) line is supplied to the FL indicator and
Q2
DTC114YUA or UN5214
the key illumination circuit.
Q3
DTA114EUA or UN5111 REMO SW
When a base goes Lo, Q3 is turned on, and PAN5V line is supplied to
IC3 and IC4.
Q4
DTC114EUA or UN5211 FL blanking SW
When a base goes Hi, Q4 is turned on, and FL indicator is lit.
Q6
DTC114YK or UN2214 SRC key illumination SW When a base goes Hi, Q6 is turned on, and SRC illumination is lit.
Q7
2SC4081
V-I converter
Current driver for green LEDs
Q8
2SC4081
V-I converter
Current driver for red LEDs
Q9
DTA114EUA or UN5111 Key illumination Red SW
When a base goes Lo, Q9 is turned on, and key illumination Red is lit.
Q10
DTA114EUA or UN5111 Key illumination Green SW
When a base goes Lo, Q10 is turned on, and key illumination Green is lit.
q ELECTRIC UNIT (X25-923X-XX)
Ref.No.
Component Name
Application/Function
Operation/Condition/Compatibility
IC1
UPD703033GFA19
System MI-COM.
IC2
TDA7407
E-VOL.& N.C. MPX
IC3
M5237ML
AVR IC
IC is combined with Q4, and it works as the error detection, the Q4's driver.
IC4
TDA7560
Power IC
IC5
TDA7401
High pass filter & Non-Fader
HPF (Front/Rear output), LPF, Non-Fader switching and volume function
volume
IC6
ICL7660SIBA
DC/DC converter
-9V AVR for pre-output amplifier
IC7
TC74HC02AF
Mute logic
2-input NOR x 4
IC8
NJM4565M-TE2
Op. amp.
Amplifier for the spectrum analyser and generation of Vref.(1/2Vcc) voltage
IC10
NJM4565M-TE2
Op. amp.
Amplifier for the front pre-outputs
IC11
NJM4565M-TE2
Op. amp.
Amplifier for the non-fader pre-outputs
IC12
NJM4565M-TE2
Op. amp.
Amplifier for the rear pre-outputs
IC14
TDA7479D
RDS decoder
IC16
S-80837ANNP
Reset IC
When BU 5V voltage is less than 3.7V, IC outputs Lo.
IC20
BA3121F
Isolation amplifier
AUX inputs isolation amplifier
IC21
BA3129F
Switched op.amp.
Input switching with AUX inputs and TAPE inputs
IC22
CXA2560Q
Dolby IC
PB EQ and Dolby IC
IC25
BR24C02F-W
EEPROM
IC26
BA6219BFP-Y
Sub motor driver
Motor driver for the sub motor of cassette mechanism
Q2
2SC4081
BU 5V AVR
While BACKUP is applied, AVR outputs +5V.
Q476
2SB1548(P)
Q2 and Q476 are inverted Darlington connection.
Q3
2SA1037K
SW 5V
While a base goes Lo, SW 5V is supplied to the microprocessor
peripheral circuits.
Q4
2SA2057
A.+8V AVR
Q4 is combined with IC3, and it works as the power supply of +8.0V output.
Q5
DTC144EUA or UN5213
A.+8V AVR SW
When Q5's base goes Hi, Q6 is turned on, and A.+8V AVR is working.
Q6
DTA124EUA or UN5112
Q7
DTA124EUA or UN5112
SW14V
When Q8's base goes Hi, Q7 is turned on, and A.+8V AVR, Voltage
Q8
DTC144EUA or UN5213
limiter and A.+10V AVR are working.
Q10
2SA2057
FL/Illumination AVR
When Q11's base goes Hi, AVR outputs +9V.
Q11
2SC4081
Q12
DTC124EUA or UN5212
FL/Illumination AVR SW
When Q12's base goes Hi, Q13 is turned on, and FL/Illumination AVR
Q13
DTA124EUA or UN5112
is working.
Q14
DTA123JK or KRA105S EXT. AMP CON. SW
When a base goes Lo, Q14 is turned on, and control pulse signal is outputted.
Q15
DTC144EUA or UN5213 Dimmer detection SW
When vehicle small lamps turn on, Q15's base goes Hi, and it is turned on.
Q16
2SB1443
A.+10V AVR
When Q17's base becomes Hi, AVR outputs +10V.
Q17
2SC4081
background image
KRC-Z965,X838
4
Q18
2SA1576A
Q18 and Q20 work as a differential amplifier, Q19 works as a driver,
Q19
2SC4081
PRE-AMP -9V AVR
and -9.3V is supplied to OP AMP.
Q20
2SA1576A
Q21
2SC4081
Q21and Q22 work as a differential amplifier, Q23 works as a driver,
Q22
2SC4081
PRE-AMP +9V AVR
and +9.7V is supplied to OP AMP.
Q23
2SA1576A
Q24
2SB1443
Main motor SW
When Q605's base goes Hi, Q24 is turned on, and BU line is supplied
Q605
DTC114YUA or UN5214
to the main motor.
Q26
2SB1277(Q,R)
P-CON SW
When Q29's base goes Hi, Q26 is turned on, and P-CON signal is outputted.
Q29
DTC124EUA or UN5212
Works during POWER ON mode.
Q27
2SA1576A
P-CON. protection SW
Protect Q26 by turning ON when P-CON output is grounded.
Q28
DTA124EUA or UN5112 P-CON. protection inhibit SW Prevents Q27 tuning ON during start-up after power ON.
While BACKUP is applied, a base goes Hi, and Q30 is turned on.
Q30
2SC4081
BU detection SW
When momentary power down has detected, a base goes Lo, and
Q30 is turned off.
Q31
2SC4081
ACC detection SW
While ACC is applied, a base goes Hi, and Q31 is turned on.
Q32
DTA124EUA or UN5112 Mute driver
When BU detection SW or System RESET or MI-COM.'s MUTE is
working, a base goes Lo, and Q32 is turned on.
Q34
2SC4081
AGC for spectrum analyser
Q35
DTC124EUA or UN5212 E. VOL. mute SW
When BU detection SW or MI-COM.'s mute is working, a base goes
Hi, and Q35 is turned on.
Q36
DTC143TUA or UN5216 Noise buffer
Q37
DTC143TUA or UN5216 Audio mute SW (Front R) When Q37's base goes Hi, Pre-output is muting.
Q38
DTC143TUA or UN5216 Audio mute SW (Front L) When Q38's base goes Hi, Pre-output is muting.
Q39
DTC143TUA or UN5216 Audio mute SW (Non Fader L) When Q39's base goes Hi, Pre-output is muting.
Q40
DTC143TUA or UN5216 Audio mute SW (Non Fader R) When Q40's base goes Hi, Pre-output is muting.
Q41
DTC143TUA or UN5216 Audio mute SW (Rear R) When Q41's base goes Hi, Pre-output is muting.
Q42
DTC143TUA or UN5216 Audio mute SW (Rear L)
When Q42's base goes Hi, Pre-output is muting.
Q43
DTC124EUA or UN5212
FM+B SW
When Q43's base goes Hi, Q44 is turned on, and A.+8V is supplied to
Q44
CPH3105
the F/E. Works during FM reception mode or RDS reception mode.
Q45
DTC124EUA or UN5212
AM+B SW
When Q45's base goes Hi, Q46 is turned on, and A.+8V is supplied to
Q46
CPH3105
the F/E. Works during AM reception mode.
Q47
DTA114YUA or UN5114 Eject green LED SW
When a base goes Lo, Q47 is turned on, and Eject green LED is lit.
Q48
DTA114YUA or UN5114 Eject red LED SW
When a base goes Lo, Q48 is turned on, and Eject red LED is lit.
Q51
2SB1427
PAN5V SW
For PAN5V on/off switching. When a base goes Lo with panel attached
to the set, Q51 is turned on, and PAN5V is supplied to the panel.
Q52
DTC143TUA or UN5216 Composite signal buffer
Q101
DTA114YUA or UN5114 DSI LED SW
When a base goes Lo, Q101 is turned on, and DSI illumination LED is lit.
Q103
DTC124EUA or UN5212 AUX/TAPE selector SW
When a base goes Hi, AUX inputs are selected.
When a base goes Lo, TAPE inputs are selected.
Q602
2SB1443
Voltage limiter
When Q603's base goes Hi, Q604 is turned on, and BU line is supplied
Q603
2SC4081
to the sub motor driver.
Ref.No.
Component Name
Application/Function
Operation/Condition/Compatibility
COMPONENT DESCRIPTION
background image
KRC-Z965,X838
5
q IC5 (SWITCH UNIT : X16-1682-71)
Pin No.
Pin Name
I/O
Description
Processing Operation
1
SC DATA
I/O Data input/output with the system MI-COM.
2
MC CLK
I
Clock input from the system MI-COM.
3
NC
O
Not used(N.C.)
4
DATA 1
O
Data output 1 to the FL driver IC
5
CLK
O
Clock output to the FL driver IC
(Data shift by the rise edge of the pulse)
6
NC
O
Not used(N.C.)
7
DATA 2
O
Data output 2 to the FL driver IC
8
CLK IN
I
Clock input from the FL driver IC
(Data shift by the rise edge of the pulse)
9
EVDD
-
Positive power supply connection terminal
Connected to P5V lines.
10
EVSS
-
Ground connection terminal
Connected to GND lines.
11
RED LED
O
Illumination red ON/OFF output in case of two colours
/Illumination ON/OFF output in case of one colour
Lo: ON, Hi: OFF
12
GREEN LED
O
Illumination green ON/OFF output in case of two colours Lo: ON, Hi: OFF in case of two colours
/Not used in case of one colour
/Not used(N.C.) in case of one colour
13
REMO
I
Data input from the remote control light sensor
14
LATCH
O
Latch output to the FL driver IC
Lo: Latch, Hi: Through
15
GCP
O
Control pulse output to the FL brightness
16
REMO ON
I/O
Power supply ON/OFF output to the remote control
light sensor IC and BPF IC
Lo: ON, Hi-z: OFF
17-19 NC
O
Not used(N.C.)
20
BLK
O
Display ON/OFF control output
Lo: Display OFF, Hi: Display ON
21
TEST
I
Test terminal
Not used(Connected to GND lines)
22-33 NC
O
Not used(N.C.)
34
RESET
I
Reset terminal
Lo: Reset, Hi: Reset release
35
XT1
-
Sub clock resonator connection terminal
Not used(Pull down to GND lines)
36
XT2
-
Sub clock resonator connection terminal
Not used(N.C.)
37
REGC
-
Capacitor connection terminal for regulator inside
microprocessor
38
X2
-
Main clock resonator connection terminal
39
X1
-
Main clock resonator connection terminal
40
VSS
-
Ground connection terminal
Connected to GND lines.
41
VDD
-
Positive power supply connection terminal
Connected to P5V lines.
42-47 NC
O
Not used(N.C.)
48
FL +3.3V
O
FL VDD ON/OFF output
Lo: OFF, Hi: ON
49
FL+B
I/O FL+B ON/OFF output
Hi-Z: OFF, Hi: ON
50-55 NC
O
Not used(N.C.)
56
BLUE LED
I/O Source key LED ON/OFF output
Hi-Z: OFF, Hi: ON
57
NC
O
Not used(N.C.)
58
BVDD
-
Positive power supply connection terminal
Connected to P5V lines.
59
BVSS
-
Ground connection terminal
Connected to GND lines.
60-71 NC
O
Not used(N.C.)
72
SA RESET
O
Reset output to the BPF IC
Hi: Reset
73
NC
O
Not used(N.C.)
74
AVDD
-
A/D converter positive power supply connection terminal Connected to P5V lines.
75
AVSS
-
A/D converter ground connection terminal
Connected to GND lines.
76
AVREF
-
A/D converter reference voltage input terminal
77
F01
I
BPF(63Hz) input
78
F02
I
BPF(150Hz) input
79
F03
I
BPF(330Hz) input
80
F04
I
BPF(1kHz) input
81
F05
I
BPF(3.3kHz) input
82
F06
I
BPF(10kHz) input
83
WAVE IN
I
Audio input
84
KR5
I
Key return 5 input
85
KR4
I
Key return 4 input
86
KR3
I
Key return 3 input
87
KR2
I
Key return 2 input
MICROCOMPUTER'S TERMINAL DESCRIPTION

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