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SERVICE MANUAL MODEL : LAC-M5530EK, LAC-M5531EK
CAR CD RECEIVER
SERVICE MANUAL
MODEL : LAC-M5530EK, LAC-M5531EK
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
- 1-1 -
❍
SECTION 1. SUMMARY
• SERVICING PRECAUTIONS
..........................................................................................................
1-2
• ESD PRECAUTIONS
.......................................................................................................................
1-3
• SPECIFICATIONS
...........................................................................................................................
1-4
❍
SECTION 2. ELECTRICAL
• ELECTRICAL TROUBLESHOOTING GUIDE
.................................................................................
2-1
• WAVEFORMS OF MAJOR CHECK POINT
..................................................................................
2-11
• INTERNAL BLOCK DIAGRAM of ICs
............................................................................................
2-13
• BLOCK DIAGRAM
.........................................................................................................................
2-27
• SCHEMATIC DIAGRAM
................................................................................................................
2-29
• PRINTED CIRCUIT DIAGRAM
......................................................................................................
2-35
❍
SECTION 3. CABINET MAIN CHASSIS & MECHANISM
• EXPLODED VIEW
...........................................................................................................................
3-1
❍
SECTION 4. REPLACEMENT PARTS LIST
....................................................................
4-1
[CONTENTS]
-1-2-
❏ SERVICING PRECAUTIONS
➊ Always disconnect the power source before:
1) Removing or reinstalling any component, circuit board, module or any other instrument assembly.
2) Disconnecting or reconnecting any instrument electrical plug or other electrical connection.
3) Connecting a test substitute in parallel with an electrolytic capacitor in the instrument.
CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in
an explosion hazard.
➋ Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by this service
manual might be equipped.
❸ Do not apply power to this instrument and or any of its electrical assemblies unless all solid-state
device heat sinks are correctly installed.
❹ Always connect a test instrument’s ground lead to the instrument chassis ground before
connecting the test instrument positive lead. Always remove the test instrument ground lead last.
1) The service precautions are indicated or printed on the cabinet, chassis or components. When servicing,
follow the printed or indicated service precautions and service materials.
2) The Components used in the unit have a specified conflammability and dielectric strength. When
replacing any components, use components which have the same ratings. Components marked in
the circuit diagram are important for safety or for the characteristics of the unit. Always replace with the
exact components.
3) An insulation tube or tape is sometimes used and some components are raised above the printed writing
board for safety. The internal wiring is sometimes clamped to prevent contact with heating components.
Install them as they were.
4) After servicing always check that the removed screws, components and wiring have been installed
correctly and that the portion around the service part has not been damaged. Further check the insulation
between the blades of attachment plug and accessible conductive parts.
SECTION 1. SUMMARY
- 1-3 -
❏
ESD PRECAUTIONS
[Electrostatically Sensitive Devices (ESD)]
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such omponents
commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are
integrated circuits and some field-effect transistors and semiconductor chip components. The following
techniques should be used to help reduce the incidence of component damage caused by static electricity.
1) Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain
off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and
wear a commercially available discharging wrist strap device, which should be removed for potential
shock reasons prior to applying power to the unit under test.
2) After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive
surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3) Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
4) Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static”
can generate electrical charges sufficient to damage ESD devices.
5) Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD
devices.
6) Do not remove a replacement ESD device from its protective package until immediately before you are
ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together
by conductive foam, aluminum foil or comparable conductive material).
7) Immediately before removing the protective material from the leads of a replacement ESD device, touch
the protective material to the chassis or circuit assembly into which the device will be installed.
CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8) Minimize bodily motions when handling unpackaged replacement ESD devices. (Otherwise harmless
motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor
can generate static electricity sufficient to damage an ESD device).
[CAUTION. GRAPHIC SYMBOLS]
THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL
TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE
OF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT
MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO
ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY
INFORMATION IN SERVICE LITERATURE.
-1-4-
1. GENERAL
Power requirements
.....................................................................................................................
DC12V~15V
Ground system
...............................................................................................................................
....
Negative
Dimensions(WxHxD)
......................................................................................................
188 x 58 x 166mm
Weight
...............................................................................................................................
...............
Net: 1.3kg
2. RADIO SECTION
FM AM(MW)
Frequency range 65.0~74.0MHz(Optional), 522~1,620kHz
87.5~108MHz (Optional:530~1,710kHz/ 520~1,620kHz)
Intermediate frequency 10.8MHz 450kHz
Usable sensitivity 12dBµV 32dBµV
Signal to noise ratio 55dB 45dB
3. COMPACT DISC SECTION
Frequency response
.....................................................................................................................
40Hz~20kHz
Channel separation
......................................................................................................................
50dB(1kHz)
Signal to noise ratio ..................................................................................................................................
70dB
4. AUDIO SECTION
Maximum output power
.......................................................................................................................
50Wx4
Speaker impedance
...............................................................................................................
4Ω x4or8Ω x4
NOTE: The design and specifications are subject to change without notice in the sourse of product
improvement.
❏
SPECIFICATIONS
- 2-1 -
❏ ELECTRICAL TROUBLESHOOTING GUIDE
Any Key Power on.
(except for “eject ”)
Is Power turn on?
OK,but no work
OK,but no work
OK,but no work
OK,but no work
OK,but no work
Check Q260 Emitter.5 Volt is OK.
Check IC201 “1 ”Pin ,5Volt is OK.
Check Q230 Collector ,0 Volt is OK.
Check IC804 “1 ”,”3 ”Pin.14Volt ,9Volt is OK.
Check IC401 “3 ”,”9 ”,”37 ”,”51 ”,”52 ”,”56 ”,
”57”5VoltisOK.
Check Clock ,“38 ”,”39 ”
CHECK LOADING SUPPLY CIRCUITRY
1.Q271,Q350,Q353
2.IC401 PIN1
3.LOOK FOR PN505 CONNECTION
Check Q380,Q381 Collector ,14Volt is OK
Check Q382 Base ,5 Volt is OK
CHECK Q260
CHECK
Q380,Q381,Q382
CHECK
IC201
CHECK
Q230
CHECK
IC804
CHECK
IC401
OK
Disc NO loading?
(1)NoPower.
SECTION 2. ELECTRICAL
-2-2-
YES
YES
YES
YES
YES
YES
(2) LCD light abnornal.
Any Key power on.
(without DISC)
Do display LCD then light?
Check voltage in the power supply
circuitry.
Power supply circuitry defective.
Q371,Q372,IC403
• Reset circuit defective.
IC201 Surrounding circuit
defective.
• IC401 pin89 defective.
X401, C415, C416.
Q260, PN401 front
PCB pattern defective.
IC401, Pin66, 67, 87
front PCB pattern defective.
IC901, Surrounding circuit
PCB pattern defective.
Is u-com IC401 reset circuit
normal? Pin88
Is u-com IC401 keyin Pin9, 37, 51,
52, 64 5volt input?
Is u-com IC401 Pin 66,67,87
output waveform normal?
Is IC901 Com1, Com2, Com3
output waveform normal?
Display LCD connector defective.
Is u-com IC401X1, X2 terminal
Pin38,39input?
OSC : 12.5MHz
NO
NO
NO
NO
NO
NO
NO
- 2-3 -
(3) CD PART
-2-4-
"READING" DISPLAY CHECK (=ONLY "CD" DISPLAY)
- 2-5 -
READING OK CHECK (="NO DISC" DISPLAY)
-2-6-
READING OK CHECK #A (="NO DISC" DISPLAY)
- 2-7 -
READING OK CHECK #B (="NO DISC" DISPLAY)
-2-8-
READING OK CHECK #C (="NO DISC" DISPLAY)
- 2-9 -
READING OK CHECK #D (="NO DISC" DISPLAY)
-2-10-
READING OK CHECK #E (="NO DISC" DISPLAY)
- 2-11 -
#1. MICOM INTERFACE WAVEFORM
(CN503 1 9,2 1 ,1 8,20) during normal play
#2. SLED DRIVE AND MOTOR WAVEFORM
(IC504 pin5, 1 4) when focus search
#3. FOCUS DRIVE AND MOTOR WAVEFORM
(R5 1 3, IC504 pin 1 5)
• When focus search failed or there is no disc on the
tray
• There is disc on tray and focus search success
❏ WAVEFORMS OF MAJOR CHECK POINT
-2-12-
#4. SPINDLE DRIVE AND MOTOR WAVEFORM
(IC504 pin6, 1 2) when TOC reading
#5. TRACK DRIVE AND MOTOR WAVEFORM
(R508, IC504 pin23) during normal play
#6. RF, TRACKING AND FOCUS ERROR WAVEFORM
(IC502 pin8, 2 1 , 23) during normal play
- 2-13 -
■ IC401 PD784214A
1) PORT ASSIGNMENT
❏
INTERNAL BLOCK DIAGRAM of ICs
-2-14-
2) PORT DESCRIPTION
Pin Name In Micom Name In Model Enable I/O I/O Output Format Description
1 P60/A16 PCD_PWR I/O O CMOS DSP power suppler ON output
2 P61/A17 PT_PWR I/O O CMOS Tuner power supplier ON output
3 A63/A18 PPWR I/O O CMOS System suppleir ON output
4 P63/A19 PTEL_MUTE I/O I - Telephone mute input
5 P64//RD PLIGHT I/O O CMOS Front light output
6 P65//WR PREMOTE I/O O CMOS Exteranl power amplifier enable output
7 P66//WAIT PDIM_IN I/O I - Dimmer input
8 P67/ASTB PSTANBY I/O O CMOS Clock for interface with volume controller
9 VDD VDD - - - Positive power spply
10 p100/TI5/TO5 PEV_CLK I/O O CMOS Clock for interface with volum controller
11 P101/TI6/TO6 PEV_CLK I/O O CMOS To volume controller, data output
12 P102/TI7/TO7 N.C. I/O I CMOS Not to be used (Open)
13 P103/TI8/TO8 PCDC_PWR I/O O CMOS CD changer power supplier ON output
14 P30/TO0 PCD_REV I/O O CMOS In MD, load motor "revers" command output
15 P31/TO1 PLMT_ISW I/O I - In MD, limit switch state input
16 P32/TO2 PCD_SW1 I/O I - In MD, SW1 state input
17 P33/TI1 PCD_SW2 I/O I - In MD, SW2 state input
18 P34/TI2 PCD_SW4 I/O O CMOS In MD, switching load and sled motor
19 P35/TI00 PCD_FWD I/O O CMOS In MD, load motor "forward" command output
20 P36/TI01 N.C. I/O I CMOS Not to be used (Open)
21 P37/EXA N.C. I/O I CMOS Not to be used (Open)
22 TEST/VPP TEST - - - pull down (470Ω ~10kΩ)
23 P90 N.C. I/O I N-CH Not to be used (Open)
24 P91 PPWR_MUTE I/O O N-CH To power amp, "MUTE" command output
25 P92 N.C. I/O I N-CH To CD changer, data output
26 P93 PAF_MUTE I/O O N-CH To tuner pack, AF mute output
27 P94 PCDC_DO I/O O N-Ch To CD changer, data output
28 P95 N.C. I/O O CMOS Not to be used (Open)
29 P120/RTP0 RDRV_OPS I/O O CMOS In MD, motor driver's power save command
output
30 P121/RTP1 PDRV_OMUTE I/O O CMOS DSP reset output
31 P122/RTP2 N.C. I/O I CMOS Not to be used (Open)
32 P123/RTP3 PDSP_IDRF I/O I - Focusing OK signal input
33 P124/RTP4 PDSP_ORST I/O O CMOS DSP reset output
34 P125/RTP5 PCD_OCEN I/O O CMOS DSP chip enale output
35 P126/RTP6 N.C. I/O I CMOS Not to be used(Open)
36 P127/RTP7 N.C. I/O I CMOS Not to used(Open)
37 VDD VDD - - - Positive power supply (+5V)
38 X2 X2 - - - X’tal 9.8304 MHz
39 X1 X1 I - - X’tal 9.8304 MHz
40 VSS GND - - - Ground
41 XT2 XT2 - - - Sub clock 32.768kHz
42 XT1 XT1 I - - Sub clock 32.768kHz
43 /RESET RESET I - - System reset input
44 P00/INTP0 PRDS_CLK I/O I - From tuner pack, RDS clock input
45 P01/INTP1 PCD_IWRQ I/O I - Sub-Q read standard level singla input
46 P02/INTP2/NMI PCDC_DI I/O I - From CD changer, data input
47 P03/INTP3 PACC I/O I - From ISO jack, ACC signal input(interrupt3)
48 P04/INTP4 N.C. I/O I - Not to be used(Open)
49 P05/INTP5 PLINE_MUTE I/O O CMOS LINE MUTE ON/OFF
50 P06/INTP6 N.C. I/O I CMOS Not to be used(Open)
51 AVDD AVDD - - - Positive power supply to A/D converter
52 AVREF0 AVREF0 - - - Reference voltage applied to A/D converter
53 P10/ANI0 N.C. I I - Not to be used(Open)
54 P11/ANI1 PS_MTR I I - Radio station’s strength singal input
55 P12/ANI2 PLVL_MTR I I - Sound level’s signal input
56 P13/ANI3 PKEY1 I I - Key #1 line input
57 P14/ANI14 PKEY2 I I - Key #2 line input
58 P15/ANI15 PVOLA I I - Encoder volume terminal #A input
59 P16/AVI16 PVOLB I I - Encoder volume terminal #B input
60 P17/ANI17 N.C. I I - Not to be used(open)
61 AVSS AVSS - - - Ground for A/D converter and D/A converter
62 P130/ANO0 N.C. I/O I CMOS Not to be used(open)
63 P131/ANO1 N.C. I/O I CMOS Not to be used(open)
64 AVREF1 AVREFI - - - Reference voltage applied to D/A converter
65 P70/RxD2/SI2 N.C. I/O I CMOS Not to be used(open)
66 P71/TxD2/SO2 PFRT_DO I/O O CMOS To LCD driver, data output
67 P72/ASCK2/SCK2 PFRT_CLK I/O O CMOS Clock output for interface with LCD driver
68 P20/RxD1/SI1 PPLL_DI I/O I - From PLL IC, data input
- 2-15 -
Pin Name In Micom Name In Model Enable I/O I/O Output Format Description
69 P21/TxD1/SO1 PPLL_DO I/O O CMOS To PLL IC, data output
70 P22/ASCK1/SCK1 PPLL_CLK I/O O CMOS Clcok output for inpterface with PLL IC
71 P23/PCL PPLL_CE I/O O CMOS PLL IC enable output
72 P24/BUZ PBEEP I/O O CMOS Beep sound output (2kHz)
73 P25/SI0/SDA0 PDSP_IDA I/O I - From DSP, data input
74 P26/SO0 PDSP_ODA I/O O CMOS To DSP, data output
75 P27//SCKO/SCLO PDSP_OCLK I/O O CMOS Not to be used (Open)
76 P80/A0 N.C. I/O I CMOS Not to be used (Open)
77 P81/A1 N.C. I/O I CMOS Not to be used (Open)
78 P82/A2 N.C. I/O I CMOS Not to be used (Open)
79 P83/A3 PST I/O I - Stereo indigater's signal or SD signal input
80 P84/A4 PRDS_DI I/O I - From tuner pack, RDS data input
81 P85/A5 POPT_IN0 I/O I - For diode option check, signal 1 or 2 input0
82 P86/A6 POPT_IN1 I/O I - For diode option check, signal 1 or 2 input1
83 P87/A7 POPT_IN2 I/O I - For diode option check, signal 1 or 2 input2
84 P40/AD0 POPT_OUTO I/O O CMOS For dinde option check, signal 1 output
85 P41/AD1 POPT_OUT1 I/O O CMOS For dinde option check, signal 1 output
86 P42/AD2 N.C. I/O I - Not to be used (Open)
87 P43/AD3 PFRT_CE I/O O CMOS LCD driver enable output
88 P44/AD4 PFRT_RES I/O O CMOS LCD driver reset output
89 P45/AD5 N.C. I/O I - Not to be used (Open)
90 P46/AD6 PANT I/O O CMOS Antenna control output
91 P47/AD7 N.C. I/O I - Not to be used (Open)
92 P50/A8 N.C. I/O I CMOS Not to be used (Open)
93 P51/A9 PVOL_MUTE I/O O CMOS Direct volume mute signal output
94 P52/A10 N.C. I/O I CMOS Not to be used (Open)
95 P53/A11 N.C. I/O I CMOS Not to be used (Open)
96 P54/A12 N.C. I/O I CMOS Not to be used (Open)
97 P55/A13 N.C. I/O I CMOS Not to be used (Open)
98 P56/A14 N.C. I/O I CMOS Not to be used (Open)
99 P57/A15 N.C. I/O I CMOS Not to be used (Open)
100 VSS VSS - - - Ground
input port setted 23
output port setted 34
Used I/O port 57
Interrupt 4
A/D Converter 4
/
