Mitsubishi RX-1MX8-T User manual

Model : RX-1MX8-T
SERVICE MANUAL
AM/FM-ST ELECTRONIC TUNING RADIO with CASSETTE
and CD PLAYER / CD CHANGER CONTROLLER
RX-1MX8-T,-MT-T
SE017207073E
FEATURES and SPECIFICATIONS .................. 2
OPERATION ................................................... 3,4
CONNECTORS .................................................. 4
BLOCK DIAGRAM .............................................. 5
SYSTEM CONFIGURATION .............................. 5
DISASSEMBLING PROCEDURES ................. 6,7
EXPLODED VIEW and PARTS LIST ................. 8
IC EXPLANATION ......................................... 9,10
ELECTRICAL PARTS LIST ......................... 11,12
PARTS LAYOUT ON PRINTED CIRCUIT BOARD
PCB-MAIN ............................................... 13,14
PCB-PANEL .................................................. 15
SCHEMATIC DIAGRAM
PCB-MAIN,PANEL .................................. 16~20
VOLTAGE ........................................................ 21
WAVEFORM .................................................... 22
2007 AUG.
MITSUBISHI MOTORS
Your company internal use only
Copyright (c) Mitsubishi Electric Corporation
MITSUBISHI ELECTRIC CORP. SANDA WORKS
CONTENTS
PART No. : 8701A209
MELCO CODE : 34M140
Model : RX-1MX8-MT-T
PART No. : 8701A209
MELCO CODE : 349308
For the mecha part, please refer to the service manual of G-MECHA(955511) (2007 JUN.).

2
FEATURES and SPECIFICATIONS
SPECIFICATIONS
AM Radio
Frequency Range : 531 ~ 1629kHz (1kHz step)
Intermediate Frequency : 450kHz
Sensitivity (6dB S/N) : Less than 15dB
FM Stereo Radio
Frequency Range : 87.5 ~ 108.0MHz (25kHz step)
Intermediate Frequency : 10.7MHz
Limiting Sensitivity : Less than 10dB
Channel Separation : More than 12dB
(Input 40dBµV)
Tape Player
Reproduction System : 4-Track, 2-Program Stereo
Tape Speed : 4.76 cm / sec.
Wow and Flutter : Less than 0.18% (WRMS)
Signal/Noise Ratio : More than 48dB
Cross-talk : More than 50dB
Separation : More than 40dB
Others
Power Supply : DC 12V (11~16V)
Test Voltage 13.2V
Negative ground
Battery Back Up Current : Less than 1.0mA ± 20%
Current Consumption : ACC 2.3A ± 20% (Output 1W)
Maximum Power Output : 45W x 4 (4 load)
Output Impedance : 4 (SP Output)
Dimensions : 183(W) x 169(D) x 52(H)mm
Weight : 1.27kg
FEATURES
Audio Part
High power, 4 channel outputs. (4 load)
Adjustment of BASS, TREBLE, BALANCE and FADER by
the Audio button.
Auto loudness to change the frequency response accord-
ing to volume level.
Radio
AM can preset the 6 stations and FM can preset the 6 sta-
tions.
The double function (auto and manual searching) button to
tune.
Scan function. (Searching available stations and receiving
it 5 seconds one by one.)
SD-WIDE Seek in AM.
Tape Player
The logic control mechanism by microcomputer. (G-
MECHA)
Power Eject function. (manual loading)
Auto tape type detection metal (high position) and normal
(not indicator).
Auto program sensor(APS) (maximum number -6 ~ +7)
during both forward and reverse playingback.
Repeat play of one program.
Any Time Eject function. (Eject at the all mode included
ACC OFF.)
Others
CD Changer (6 discs or 10 discs), In dash CD changer (4
discs or 6 discs) controls.
Disc Select, Track Select, Fast Forward / Fast Backward
function, Play mode Select (Normal, Repeat, Random and
Scan).
CD Player controls.
Track Select, Fast Forward / Fast Backward function, Play
mode Select (Normal, Repeat, Random and Scan).
M-BUS method to communicate with external CD Changer,
In dash CD Changer and CD Player.
Scan function. (Playing back top 10 seconds of all tracks
one by one.)
A liquid crystal display (LCD, positive type), which has
good visibility.
Beep (high-pitch tone for 40 msec) sounds to check opera-
tion by long pressing button during the audio adjustment
mode.
The luminosity of an LCD falls automatically just as the
lighting of a vehicle is put on.
Rheostat function. (The intensity of buttons, panel and
LCD can adjust to link with the intensity of vehicle's instru-
ment panel lighting.)
The connections of speakers wiring can be checked by
test mode of the beep in the vehicle's assembly line.
Inclined installation angle :
20
±
15

3
OPERATION
RADIO & AUDIO PART
Power Switch
Volume Control
(Endless)
Memory and Preset Channel Button
Preset : Press for 0.5 seconds.
Memory : Press for 1.5 seconds or more.
Radio Scan Button
ID Code
Radio ON Button and
Band Select Button
(AM FM)
Audio Adjustment Mode Select Button
Bass Treble Fader
Cancel Balance
Auto Tune UP/DOWN Button
Audio Adjustment UP/DOWN Button
TAPE PLAYER PART
Tape Eject Button
Tape Mode Button
Repeat ON/OFF Button
Fast Forward Automatic Program
Sensor (F-APS) Button
Rewind Button
Running Direction Changeover Button
Fast Forward Button
Rewind Automatic Program
Sensor (APS) Button

4
CD Player / CD Changer PART
Repeat ON/OFF Button
Random
ON/OFF Button
Fast Backward Button
Fast Forward Button
CD Mode Button
(TAPE) CD-P In dash CD-C
CD-C
CD-C Disc Select UP Button
Scan Button
Track Select UP/DOWN Button
CONNECTORS
Antenna Socket
1
23
45
6
7
13
12 1110 9
8
H
12345
67
141312 1110 9 8
Power supply / Speaker
14P Connector
CD Changer
13P DIN Socket
Pin
No.
1 SIG GND
2 Lch
3
4 Rch
5
6
7 ACC (+)
Name Pin
No.
8
9 Battery (+)
10 ILL LEVEL
11 M-BUSY
12 M-SCK
13 M-DATA
H SHIELD EARTH
Name
CD Changer 13P DIN SocketPower supply / Speaker 14P Connector
8 Speaker FL (_)
9 Illumination (_)
10 Battery (+)
11 Accessory (+)
12
13 Speaker RL (_)
14 Speaker RR (_)
1 Speaker FR (+)
2 Speaker FL (+)
3 Illumination (+)
4 Antenna + B
5 Speaker RL (+)
6 Speaker RR (+)
7 Speaker FR (_)
Pin
No. Name Pin
No. Name

5
SYSTEM CONFIGURATION
14P
MAIN ANTENNA
AUDIO UNIT
RX-1MX8-T
RX-1MX8-MT-T
SPEAKER
FR
FL
RL
RR
BLOCK DIAGRAM
PANEL
MICROCOMPUTER
LCD
ILLUMINATION
CIRCUIT
TUNER
1. FR+ 2. FL+ 3. ILL+ 4. ANT+ 5. RL+ 6. RR+ 7. FR- 8. FL- 9. ILL- 10. BATT 11. ACC 12. N.C. 13. RL- 14. RR-
POWER-IC
BUTTON
ILLUMINATION
CIRCUIT
ANTENNA
POWER
FILTER CIRCUIT
MUTE CIRCUIT
BATT 5V
POWER SUPPLY
ACC 9V
POWER SUPPLY
ACC 5V
POWER SUPPLY
AM/FM
POWER SUPPLY
ELECTRONIC
VOLUME
LCD
ILLUMINATION
LCD
DRIVER
LCD
DISPLAY
OPERATION
KEY
SWITCH
VOLUME
CONTROL
ENCODER
1. SIG-GND 2. Lch 3. N.C. 4. Rch 5. N.C. 6. N.C. 7. ACC 8. N.C. 9. BATT 10. LAMP Vcc 11. M-BUSY 12. M-SCK 13. M-DATA
M-BUS BUFFER
BUTTON
ILLUMINATION
1. SIG-GND 2. Lch 3. Rch 4. GND 5. 9V 6. BATT 7. END-L 8. BLANK 9. END-R 10. M3/FF 11. M2/PLAY 12. M1/DOLBY 13. PKIN/MTL 14. M0/MTL 15. POWER 16. MMON 17. PMCW 18. PMCCW
G-MECHA
IC801
IC301
J801
IC8B1
P891
Q801
L890
Q852
Q891
FE101
Q857
Q810
IC901
LCD901
VR901
Q8E0
Q1
POWER LINE
SIGNAL LINE
CONTROL LINE

6
HEAT-SINK
14(A)
3
3
22(C)
COVER
(A)
(A)
42(A)
5
4(A)
FLAT-CABLE 19P
G-MECHA
DISASSEMBLING PROCEDURES
2. Removal of G-MECHA (See Fig.2)
1) Unscrew the four screws ( 5 ).
2) Remove the FLAT-CABLE 19P.
3) Remove the G-MECHA.
Fig.2
1. Removal of COVER, HEAT-SINK (See Fig.1)
1) Unscrew the four screws ( 1 ).
2) Remove the COVER.
3) Unscrew the two screws ( 2 ),
two screws ( 3 ) and two screws ( 4 ).
4) Remove the HEAT-SINK.
Fig.1

7
7
2(A)
6
4(D)
PCB-PANEL
(a)
ASSY-PANEL
KNOB-VOL
CHASSIS-F
PCB-MAIN
9
(A)
(b)
8
2(A)
9
(A)
10
(B)
BRACKET-DECK
4. Removal of PCB-MAIN (See Fig.4)
1) Unscrew the two screws ( 8 ).
2) Remove the BRACKET-DECK.
3) Unscrew the two screws ( 9 ), one screw ( 10 ).
4) Unlatch the five hooks ( b ).
5) Remove the PCB-MAIN.
Fig.4
Fig.3
3. Removal of ASSY-PANEL, PCB-PANEL (See Fig.3)
1) Unlatch the eight hooks ( a ).
2) Remove the ASSY-PANEL.
3) Unscrew the four screws ( 6 ), remove the KNOB-VOL.
4) Remove the PCB-PANEL.
5) Unscrew the two screws ( 7 ).
6) Remove the CHASSIS-F.

8
EXPLODED VIEW and PARTS LIST
M002
M013
M005
M009
M012
M007
M004
M006
4
A
4
A
4
D
A
A
1
M008
M003
M010
M011
M014
M015
LCD901
M001
1
A
A
2
A
2
C
2
A
A
A
B
2
E
ABC
1
2
3
M001 246L350O3 FLAT-CABLE 19P C-2
M002 560J26218 CHASSIS-B B-3
M003 560J36110 CHASSIS-F A-3
M004 591K36211 BRACKET-DECK C-2
M005 591K61812 COVER A-2
M006 635J07411 HEAT-SINK C-3
M007 641K28910 HOLDER-LCD B-2
M008 643L30511 SHEET-CVR A-1
M009 643L33411 SCREEN-LCD B-2
M010 643L63310 SHEET A-1
M011 734L87710 KNOB-VOL A-2
M012 761L46810 PRISM-LCD B-2
M013 892L45210 ASSY-PANEL A-3
M014 940L18515 G-MECHA(955511) C-1
M015 943M240O6 NAME-CARD(RX-1MX8-T) .... (1) A-2
943M240O7
NAME-CARD(RX-1MX8-MT-T) .. (2) A-2
A 653P11046 SCREW-S-PAN 3X6 -
B 653P11048 SCREW-S-PAN 3X10 -
C 653P11052 SCREW-S-PAN 3X16 -
D 653P33014 SCREW-P-BIND 2X6 -
E 669L057O1 SCREW-TAP 3X6 -
Ref. No. Part No. Description Index
Model : RX-1MX8-T ............ (1)
RX-1MX8-MT-T ......(2)

9
IC EXPLANATION
IC8B1 LA4742
IC301 LC75411UES
LVref
LVref
LVref
RVref
RVref
RVref
LVref
RVref
VDD
Multiplexer
CONTROL
CIRCUIT
Multiplexer ZERO CROSSDET
ZERO CROSSDET
LOGIC CIRCUIT
CCB
INTERFACE
NO SIGNAL
TIMMER
36
L3
35
L4
37
L2
38
L1
40
Vref
41
R1
42
R2
43
R3
44
R4
34
LSELO
33
LVRIN
32
LCT
31
LCOM
30
LVROUT
29
LTIN
28
LF1C1
27
LF1C2
26
LF1C3
25
LF3C1
24
LTOUT
1
RSELO
2
RVRIN
3
RCT
4
RCOM
5
RVROUT
6
RTIN
7
RF1C1
8
RF1C2
9
RF1C3
10
RF3C1
11
RTOUT
23 LFIN
22 LFOUT
21 LROUT
19 CL
18 DI
17 CE
15 TIM
14 RROUT
13 RFOUT
12 RFIN
39
VDD
16 TEST
20 VSS
Muting &
ON Time Control
Circuit
Ripple
Filter
Protective
circuit
Protective
circuit
Mute
circuit
Aux
circuit
Stand by
Switch
Clip
Detect
Circuit
16 14 1 15 10 4 12 25 11
9
6
20
7853222171918212324
13
ON TIME
PWR GND4 PWR GND3 PWR GND2 PWR GND1
OUT 4
OUT 4+
OUT 3
OUT 3+
OUT 2
OUT 2+
OUT 1
OUT 1+
MUTE
IN 4 PRE GND AUX IN IN 3 R.F ST BY IN 2 CLIP DET IN 1
Vcc1/2
Vcc3/4

10
IC174 TC4S66F-TE85L IC901 BU9716BK
VSS
VDD
CONT
IN/OUT
OUT/IN
1
2
3
5
4
VDD1
VDD2
38
39
LCD DRIVE
VOLTAGE
GENERATOR
COMMON DRIVER
OSCILLATOR
CONTROL
LOGIC
SEGMENT DRIVER
DATA LATCH
36
42
44
43
41
33 34 35 1 2 3430 31 32
RES
CS
D1
CK
OSC
COM1 COM2 COM3
S1 S2 S3 S4
S30 S31
S32

11
R6,104,etc. 103L299O9 R-CHIP 0
R350,351,etc. 103L298O4 R-CHIP 2.2
R910~912 103L240O4 R-CHIP 18
R913~918 103L240O7 R-CHIP 33
R903 103L291O6 R-CHIP 180
R855,864 103L291O7 R-CHIP 220
R170,834,835 103L291O9 R-CHIP 330
R880,884 103L292O2 R-CHIP 560
R812 103L292O3 R-CHIP 680
R8E0,921 103L292O4 R-CHIP 820
R861,862 103L242O5 R-CHIP 1k
R335,435,etc. 103L292O5 R-CHIP 1k
R872,873,etc. 103L292O6 R-CHIP 1.2k
R173,924 103L292O7 R-CHIP 1.5k
R890,891 103L242O8 R-CHIP 1.8k
R856,925 103L292O8 R-CHIP 1.8k
R171,172,etc. 103L292O9 R-CHIP 2.2k
R889,893 103L193O0 R-CHIP 2.7k
R854 103L243O0 R-CHIP 2.7k
R877,881,etc. 103L293O0 R-CHIP 2.7k
R2,876,etc. 103L293O1 R-CHIP 3.3k
R326,426,etc. 103L293O2 R-CHIP 3.9k
R1,310,etc. 103L293O3 R-CHIP 4.7k
R871,8F0,etc. 103L293O4 R-CHIP 5.6k
R874,931 103L293O5 R-CHIP 6.8k
R3,4,etc. 103L293O7 R-CHIP 10k
R932 103L293O8 R-CHIP 12k
R334,370,etc. 103L293O9 R-CHIP 15k
R801 103L294O2 R-CHIP 27k
R325,425 103L294O3 R-CHIP 33k
R101,102,etc. 103L294O5 R-CHIP 47k
R174,830,etc. 103L294O9 R-CHIP 100k
R8F4 103L295O1 R-CHIP 150k
R852,8F3 103L295O5 R-CHIP 330k
R8N9,8NA 109P01217 R-NETWORK-CHIP 100
R8N2,8N8 109P01218 R-NETWORK-CHIP 1k
R8N6,8N7 109P01219 R-NETWORK-CHIP 4.7k
Q857 260L021O3 TR 2SD1858Q
Q852,8E0 260P68210 TR 2SD2375OP
Q2,874,etc. 260P16010 TR KTA1504S
Q1,891 260P11710 TR-CHIP 2SA1364
Q801 260L049O2 TR-CHIP 2SC3439
Q170,171 260P13210 TR-CHIP 2SC5232B
Q872,875,878 260L010O1 TR-CHIP 2SD601A
Q871 260L042O4 TR-CHIP DTA114T
Q854,8D1 260L042O2 TR-CHIP DTA144T
Q812 260L042O3 TR-CHIP DTC144T
Q810,811,etc. 260P15910 TR-CHIP KRA103S
Q3,174,etc. 260P15411 TR-CHIP KRC103S
Q813,850,etc. 260P16110 TR-CHIP KTC3875S
Q333,433,etc. 260P17010 TR-CHIP RT6N230C
C814 141L182O1 C-CERAMIC-CHIP 27pF
C173,870~872 141L183O5 C-CERAMIC-CHIP 100pF
C6,101,etc. 141L160O9 C-CERAMIC-CHIP 1000pF
C8F0~8F2 141L161O1 C-CERAMIC-CHIP 1500pF
C312,412 141L161O3 C-CERAMIC-CHIP 2200pF
C832,833 141L161O7 C-CERAMIC-CHIP 4700pF
C3,4,etc. 141L162O1 C-CERAMIC-CHIP 0.01µF
C311,411,812 141L163O3 C-CERAMIC-CHIP 0.022µF
C326,426,8C0 141L164O5 C-CERAMIC-CHIP 0.068µF
C8,321,etc. 141L164O6 C-CERAMIC-CHIP 0.1µF
C892 141L068O6 C-CERAMIC-CHIP 0.15µF
C174,329,etc. 141L168O5 C-CERAMIC-CHIP 0.15µF
C322,422 141L068O7 C-CERAMIC-CHIP 0.22µF
Part No. L
141L06xOx 2.0mm
141L16xOx 1.6mm
141L18xOx 1.6mm
Part No. L
103L19xOx 2.0mm
103L24xOx 3.2mm
103L29xOx 1.6mm
ELECTRICAL PARTS LIST
< CHIP PARTS (RESISTORS & CAPACITORS) >
SOLDERING PART
L
CHIP PARTS (RESISTORS)
Ref. No. Part No. Description Ref. No. Part No. Description
TRANSISTORS
D891 264P607O2 DIODE-CHIP 1SR154-400
D801,851,893 264P66310 DIODE-CHIP KDS4148U-RTK/P
D830,831 264P617O1 DIODE-CHIP MC2836
D832,833 264P618O1 DIODE-CHIP MC2838
D892 264P63410 DIODE-CHIP RB160L-60T
D890 264P516O1 DIODE-CHIP S3D6600
D802 264L067O2 DIODE-Z-CHIP MA8056H
D810 264P584O7 DIODE-Z-CHIP MA8082M
D8E0 264P584O9 DIODE-Z-CHIP MA8091L
D852 264P585O3 DIODE-Z-CHIP MA8100M
D850 264P585O6 DIODE-Z-CHIP MA8110M
D370,470,etc. 264P588O6 DIODE-Z-CHIP MA8270M
CHIP PARTS (CAPACITORS)
C821,822 141L181O1 C-CERAMIC-CHIP 10pF
C1 141L181O5 C-CERAMIC-CHIP 15pF
C815 141L181O9 C-CERAMIC-CHIP 22pF
DIODES

12
IC901 263P328O2 IC BU9716BK
IC8B1 266P524O1 IC LA4742
IC301 263P160O3 IC LC75411UES
IC174 263L000O6 IC TC4S66F-TE85L
IC801 263P23035 IC µPD178054GC-224-8BT
RF891 103L390O1 R-FUSE
RF890 103L390O2 R-FUSE
Ref. No. Part No. Description
Ref. No. Part No. Description
L890 351P11810 COIL-CHOKE
L1,810 351P081O6 COIL-CHOKE-CHIP
RESISTORS
COILS
IC
CONNECTORS
P891 452L34211 CONNECTOR 14P
J901 452P151O5 CONNECTOR 14P
P830 452P27814 CONNECTOR 14P
J8A0 452L214O9 CONNECTOR 19P
SCT101 449L076O2 SOCKET-ANT
J801 449L098O3 SOCKET-DIN 13P
PL903~906 253L47610 LAMP-CHIP
PL901,902 253L47611 LAMP-CHIP
X801 285L005O3 CRYSTAL
LCD901 289P17810 LCD
FE101 295P21514 TUNER-AMFM
Z1 299P136O2 PROTECTOR-CHIP
VR901 430L026O1 SW-ROTARY
SW901~906,etc. 432P02010 SW-PUSH 2P
HTR-1 593L29212 HOLDER-TR
HIC-1 593L69911 HOLDER-IC
PLT101 593L70110 PLATE-G
OTHERS

TO PCB-PANEL
(J901)
PCB-MAIN
PARTS LAYOUT ON PRINTED CIRCUIT BOARD
MODEL : RX-1MX8-T,-MT-T (PARTS SIDE)
13

TO G-MECHA
PCB-MAIN
PARTS LAYOUT ON PRINTED CIRCUIT BOARD
MODEL : RX-1MX8-T,-MT-T (PATTERN SIDE)
14

TO PCB-MAIN
(P830)
PCB-PANEL
PARTS LAYOUT ON PRINTED CIRCUIT BOARD
MODEL : RX-1MX8-T,-MT-T
15
(PARTS SIDE)
(PATTERN SIDE)

MODEL : RX-1MX8-T,-MT-T PCB-MAIN,PANEL
Vol.1
Vol.2
Vol.3
Vol.4
SCHEMATIC DIAGRAM
16

17
SCHEMATIC DIAGRAM PCB-MAIN,PANEL MODEL : RX-1MX8-T,-MT-T Vol.1

18
SCHEMATIC DIAGRAM PCB-MAIN,PANEL MODEL : RX-1MX8-T,-MT-T Vol.2

19
SCHEMATIC DIAGRAM PCB-MAIN,PANEL MODEL : RX-1MX8-T,-MT-T Vol.3

20
SCHEMATIC DIAGRAM PCB-MAIN,PANEL MODEL : RX-1MX8-T,-MT-T Vol.4