DETACHABLE FRONT
PANEL CAR CD RECEIVER
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL : LAC-M6600(R)
SER VICE MANU AL MODEL : LAC-M6600(R)
- 1-1 -
[CONTENTS]
❍ SECTION 1.GENERAL
• SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
• ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
• SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
❍ SECTION 2. ELECTRICAL
• ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
• WAVEFORMS OF MAJOR CHECK POINT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
• INTERNAL BLOCK DIAGRAM of ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
• BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
• SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
• PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27
❍ SECTION 3. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
❍ SECTION 4. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
- 1-2 -
SECTION 1. SUMMARY
❏ SERVICING PRECAUTIONS
❶ 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.
❷ Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by
this service manual might be equipped.
❹ Do not apply power to this instrument and or any of its electrical assemblies unless all
solid-state device heat sinks are correctly installed.
❸ 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.
- 1-3 -
❏ ESD PRECAUTIONS
Electrostatically Sensitive Devices (ESD)
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components
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 materials).
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 by installed.
CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL
OTHER SAFETY PRECAUTIONS.
8. Minimize bodily motions when handing 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 -
❏ SPECIFICATIONS
1. GENERAL
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC12V~15V
Ground system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Negative
Dimensions(W x H x D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 10dBµV 28dBµV
Signal to noise ratio 55dB 45dB
3. COMPACT DISC SECTION
Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Hz~20kHz
Channel separation (Line out) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90dB (1kHz)
Signal to noise ratio (Line out) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110dB
4. AUDIO SECTION
Maximum output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50W x 4
Speaker impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Ω x 4 or 8Ω x 4
NOTE: The design and specifications are subject to change without notice in the sourse of product
improvement.
- 2-1 -
SECTION 2. ELECTRICAL
❏ ELECTRICAL TROUBLESHOOTING GUIDE
1. No Power.
Any Key power on.
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Is power turnd on?
DISC loading?
Does initial reading occur?
Can disc be played?
Is audio output supplied?
OK
Check audio circuitry.
IC501,IC509, CN503
Check tracking servo circuitry.
Q541, IC501, IC503
Check DISC.
Check focusing circuitry.
Q541, IC501
Check laser circuitry.
Q541, IC501
Check loading supply circuitry.
Q901, Q902, Q903, Q904, PN503,
IC507, IC506, IC508
Check power supply circuitry.
Q930, Q924, Q919,
Q920, Q921, IC902, pin1
- 2-2 -
2. LCD light abnornal.
YES
YES
YES
YES
YES
YES
NO NO
NO
NO
NO
NO
NO
Any Key power on.
(without DISC)
Do display LCD then light?
Check voltage in the power
supply circuitry.
Power supply circuitry defective.
Q924, Q930, Q926, Q928,
Q925, IC902
• Reset circuit defective.
IC601 Surrounding circuit
defective.
• IC906 pin74 defective.
X101, X102, C101,
C102, C103, C104
CN601, PN601, PN103 front
PCB pattern defective.
IC906, Pin75, 76, 78
front PCB pattern defective.
IC601, Surrounding circuit
PCB pattern defective.
Display LCD connector
defective.
Is IC601 Com1~Com10
output waveform normal?
Is u-com IC906 Pin75, 76, 78
output waveform normal?
Is u-com IC901 reset circuit
normal? Pin74
Is u-com IC906 keyin Pin63, 64
5volt input?
Is u-com IC906 X1, X2 terminal
Pin11, 12, 14, 15 input?
OSC : 19.2MHz
OSC : 32.768kHz
- 2-3 -
3. Initial reading is not carried out.
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES (with disc)
NO NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
Slide motor moves
(With disc)
Spindle motor turns
WAVEFORM #1
Does RF waveform
appear? IC501 Pin49
WAVEFORM #2
Check the Voltage change of
CN503 Pin12 (6.4~6.8V)
Check the Voltage IC501
Pin23 (1.4V~1.8V)
Check the Data transmission
from CN503 (16, 17, 18) to CD
DSP WAVEFORM
Check the Data transmission
from CN503 Pin21 to MICOM
WAVEFORM
Check the TRVP
Voltage
IC501 Pin25
Check the change of
SL +, SL – Voltage
IC503 Pin13,14
Does FA+ waveform appear at
IC501 Pin23?
WAVEFORM #3
Laser light check A ?
focus coil drive wareform.
TRACKING ERROR wareform
Defective contact CN501
Defective PICK-UP
Defective IC503
Defective IC501
Defective
connector CN503
Defective IC503
Defective connector
CN503 Defective
MICOM
Defective IC501
Defective
connector CN503
Does TE waveform appear at
IC501 Pin24?
WAVEFORM #4
Is rotation normal?
Is there no dropout of RF signal?
Defective IC501
Defective PICK-UP
- 2-4 -
When laser does not light.
A
Is “2.4V~3.4V” applied to
pin42 of IC501?
( ➀ 3.4V ➁ 2.4V)
Did pickup return to
innermost circular?
Does it stop at inner pick
circular after shift?
Is defect output from LMT
SW applied to Pin7 of
PN503?
Is data transferred from
MICOM IC ?
Does voltage appear at
IC503 Pin 13, 14?
Defective MICOM or CN503.
Defective IC501.
Defective slide motor and/or
connector. (CN502)
Defective LMT SW and/or
connector. (CN502,CN503)
Defective MICOM.
Defective IC501
Is power supplied to laser Q541?
(Q541 collector: about 1.8V)
OV
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
OPEN CLOSE
- 2-5 -
When laser light.
B
When SPINDLE motor dose not turn
C
NO
NO
NO
NO
YES
YES
YES
YES
Laser lights
Check the signal FOCUS
SEARCH of IC501 Pin25
WAVEFORM #3
Check the signal of IC503
Pin 15, 16
WAVEFORM #3
Defective IC501
Defective IC501
Degraded laser diode
Defective PICK-UP
Defective IC501
Defective IC503
Defective contact CN501
or Defective PICK-UP
Check the change for
SP +, SP –, Voltage
of IC503 Pin11, 12
WAVEFORM #1
Check the change for
SPDO Voltage
of IC501 Pin21
WAVEFORM #1
- 2-6 -
❏ WAVEFORMS OF MAJOR CHECK POINT
#1. SPINDLE DRIVE AND MOTOR WAVEFORM
IC501(21), IC504(12) during TOC reading
#2. RF WAVEFORM
IC501(45), IC501(49) during TOC reading
#4. TRACK DRIVE AND MOTOR WAVEFORM
IC504(24), IC503(17) during TOC reading
#3. FOCUS DRIVE AND MOTOR WAVEFORM
IC501(25), IC503(15)
• When focus search failed or there is no disc on tray
• There is disc on tray and focus search success
- 2-7 -
❏ INTERNAL BLOCK DIAGRAM of ICs
■ AV_CAR
1) Micom Port Assignment
- 2-8 -
2) Pin Descriptions
- 2-9 -
- 2-10 -
■ BD3805F
1) BLOCK DIAGRAM
- 2-11 -
■ PCM1754 (DAC)
1) Connection Diagram
■ MN6627956 (DSP)
1) Connection Diagram
Power pin
DV
DD
DV
DD
DV
SS
DV
SS
DV
SS
IO
VD
D2 D1
IO
VD
12---
MN6627954
IOVDD
- 2-12 -
2) Block Diagram
NTEST2
NTEST
NSRVMONON
NRST
AVDD2
LD
PD
ARFFB
ARFOUT
ARFDC
RFOUT
RFIN
CENV
CTRCRS
OSCIN
VREF
RFENV
* SPPOL
SPOUT
TRVP
TRP
FOP
SRVMON0
SRVMON1
Nanes in [ ] are Block abbreviartion.
Signals in ( ) are input signal or output signal by IO changing.
Pins marked * is the pins enable to change another signals.
OUTPUT
PORT
DIGITAL
OUT
REGULATOR
A/D
CONVERTER
CMOS
RF
AMPLIFIER
TIMING
GENERATOR
[GEN]
MICRO COMPUTER
INTERFACE
[MCIF]
DSL / PLL / VCO
[DSLPLL]
SPINDLE
SERVO
[SPD]
SERVO
CPU
[DSV]
MP3/WMA
DECORDER
ANALOG
LOWPASS
FILTER
DIGITAL FILTER
1bit DAC
PWM LOGIC
[DF.MASH]
SERIAL OUTPUT
INTERFACE
[DAO]
BUS CONTROL UNIT
[BCU]
CIRC RAM
1Mbit
DRAM
SUBCODE
INTERFACE
[DEMECC]
* TXTCK
PLLFO
IOVDD1
IOVDD2
DRVDD
DVDD1
DVDD2
DVSS1
DVSS2
DVSS3
OUTL
OUTR
AVDD1
AVSS1
* TX
(LRCKIN)
(BCLKIN)
(SRDATIN)
PLLF
DSLF
IREF
ARFIN
M DATA
MCLK
MLD
* STAT
(PMCK)
(SMCK)
X2
X1
* TXTD
* DQSY
(SBCK)
(SUBC)
(TXNCLDCK)
PRAMVDD33
PRAMVSS33
* EXT0
* EXT1
* EXT2
(LRCK)
(BCLK)
(SRDATA)
(DVDD2)
D0 ~ D15
A0 ~ A11
BA0,BA1
NWE,NCAS,
NRAS,SDRCK
* FLAG
* BLKCK
EFM DEMODULATION
SYNC INTERPOLATION
CIRC ECC
CDROM ECC
[DEMECC]
FS
CONVERTER
[FSC]
AVSS2
A,B,C,D,E,F
- 2-13 -
■ TB2903HQ
1) Block Diagram
- 2-14 -
■ BA5810FP
1) Block Diagram
M
STM
X 3
FOCUS
TRACKING
POWVCC
=5V
'L' → MUTE
MUTE
TRACKING IN
FOCUS IN
BIAS
LOADING PRE
FWD REV
LOADING
INPUT
LOADING
VOLTAGE
CONTROL
PS
STEPPING
INPUT
PREVCC
=12V
POWVCC
=5V
LOADING
PREVCC
10k
10k
LEVEL
SHIFT
LEVEL
SHIFT
LEVEL
SHIFT
LEVEL
SHIFT
CH1~CH4
MUTE
POWVCC34
(CH3, CH4)
10k
10k
10k
10k
10k
10k
10k
10k
10k
10k
10k
10k
10k
10k
16k
7.5k
7.5k
7.5k
7.5k
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
16k
16k
16k
POWVCC12
(CH1, CH2)
POWER
SAVE
1234567 89
10
11 12 13 14
28 27 26 25 24 23 22 21 20
19
18 17 16 15
❏ BLOCK DIAGRAM
2-15 2-16
2-17 2-18
❏ SCHEMATIC DIAGRAMS
• MAIN SCHEMATIC DIAGRAM
2-19 2-20
• MAIN-2 SCHEMATIC DIAGRAM
2-21 2-22
• FRONT SCHEMATIC DIAGRAM
2-23 2-24
• TRIM SCHEMATIC DIAGRAM • LED SCHEMATIC DIAGRAM
2-25 2-26
• CD SCHEMATIC DIAGRAM
2-27 2-28
❏ PRINTED CIRCUIT BOARD DIAGRAMS
• MAIN P.C. BOARD DIAGRAM
2-29 2-30
• FRONT/TRIM P.C. BOARD DIAGRAM
• LED P.C. BOARD
• TRIM P.C. BOARD DIAGRAM
2-31 2-32
• CD P.C. BOARD
3-1 3-2
835
818
*Accessory
275
451
281
451
450
A26
276
A41
454
452
456
451
280
278
451
279
457
A43
A48
250
270
284
285
A45
274
271
282
A47
A49
260
261
263
453
262
264
262
286
287
289
288
290
A50
291
292
298
294
296
283
A46
451
A46
CN505
254
259
252
A40
450
255
256
257
258
253
450
251
A42
SECTION 3. EXPLODED VIEWS
❏ CABINET AND MAIN FRAME SECTION
3-3 3-4
2
3
4
5
1
1
2
A03
❏ MECHANISM (PICK-UP)
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