Sony CDX-L480N User manual

1
Ver 1.0 2003. 07
Model Name Using Similar Mechanism CDX-L480X
CD Drive Mechanism Type MG-393XC-121//Q
Optical Pick-up Name KSS-721A
SERVICE MANUAL
Thai Model
CDX-L480N
FM/AM COMPACT DISC PLAYER
• The tuner and CD sections have no adjustments.
Sony Corporation
e Vehicle Company
Published by Sony Engineering Corporation
9-961-055-01
2003G04-1
© 2003. 07

2
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE
WITH MARK 0ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission, ob-
serve from more than 30 cm away from the objective lens.
Notes on Chip Component Replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
CDX-L480N
TEST DISCS
This set can playback CD-R and CD-ROM discs. The following
test discs should be used to check the capability:
CD-R test disc TCD-R082LMT (Part No. J-2502-063-1)
CD-RW test disc TCD-W082L (Part No. J-2502-063-2)

3
zUNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40°C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
•Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
•Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
EXTENSION CABLE AND SERVICE POSITION
Whenrepairingorservicingthisset,connectthejig(extensioncable)
as shown below.
•Connect the MAIN board (CNP301) and the SERVO board (CN1)
with the extension cable (Part No. J-2502-011-1).
CDX-L480N
MAIN BOARD
CNP301
J-2502-011-1
SERVO BOARD
CN1

4
TABLE OF CONTENTS
1. DISASSEMBLY
1-1. Sub Panel Assy .................................................................... 5
1-2. CD Mechanism Block ......................................................... 6
1-3. Main Board ......................................................................... 6
1-4. Heat Sink ............................................................................. 7
1-5. Chassis (T.U) Assy .............................................................. 7
1-6. Disc in Board ...................................................................... 8
1-7. Servo Board ......................................................................... 8
1-8. Shaft Roller Assy ................................................................ 9
1-9. Floating Block Assy ............................................................ 9
1-10. Optical Pick-up Block .......................................................10
2. DIAGRAMS
2-1. IC Pin Description............................................................. 11
2-2. Block Diagram –CD Section–...........................................12
2-3. Block Diagram –Tuner Section–....................................... 13
2-4. Block Diagram –Display Section–.................................... 14
2-5. Circuit Boards Location .................................................... 15
2-6. Printed Wiring Boards –CD Mechanism Section–............ 16
2-7. Schematic Diagram –CD Mechanism Section– ................ 18
2-8. Printed Wiring Board –Main Section– .............................. 19
2-9. Schematic Diagram –Main Section (1/2)– ........................ 20
2-10. Schematic Diagram –Main Section (2/2)– ........................ 21
2-11. Printed Wiring Board –Key Section– ................................ 22
2-12. Schematic Diagram –Key Section–................................... 23
2-13. IC Block Diagrams............................................................ 24
3. EXPLODED VIEWS
3-1. Chassis Section ................................................................. 27
3-2. Front Panel Section ........................................................... 28
3-3. CD Mechanism Section (1) ............................................... 29
3-4. CD Mechanism Section (2) ............................................... 30
3-5. CD Mechanism Section (3) ............................................... 31
4. ELECTRICAL PARTS LIST ........................................ 32
CDX-L480N

5
CDX-L480N
SECTION 1
DISASSEMBLY
Note : This set can be disassemble according to the following sequence.
Note : Follow the disassembly procedure in the numerical order given.
1-1. SUB PANEL ASSY
1-1. SUB PANEL ASSY
(Page 5)
1-2. CD MECHANISM BLOCK
(Page 6)
1-5. CHASSIS (T.U) ASSY
(Page 7)
1-6. DISC IN BOARD
(Page 8)
1-8. SHAFT ROLLER ASSY
(Page 9)
1-9. FLOATING BLOCK ASSY
(Page 9)
1-10. OPTICAL PICK-UP BLOCK
(Page 10)
SET
1-7. SERVO BOARD
(Page 8)
1-3. MAIN BOARD
(Page 6)
1-4. HEAT SINK
(Page 7)
2 claws
3 claws
4 sub panel assy
1 two screws
(PTT 2.6x6)

6
CDX-L480N
1-2. CD MECHANISM BLOCK
1-3. MAIN BOARD
1 screw
(PTT 2.6x6)
6 two screws
(PTT 2.6x4
)
7 bracket (CD)
2 screw
(PTT 2.6x6)
5 CD mechanism block
4 CNP301
3
1 two screws
(PTT 2.6x6
)
3 screw
(PTT 2.6x6)
(ground point)
4 two screws
(PTT 2.6x6)
(ground point)
5 MAIN board
2 two screws
(PTT 2.6x6)

7
CDX-L480N
1-4. HEAT SINK
1-5. CHASSIS (T.U) ASSY
1 screw
(PTT 2.6x8)
3 screw
(PTT 2.6x8
)
5 heat sink
4
2
two screws
(PTT 2.6x12)
4 chassis (T.U) assy
3 two screws
(P 2x3)
2 two screws
(P 2x3)
1 Unsolder the
lead wires.
black
red
white

8
CDX-L480N
1-6. DISC IN BOARD
1-7. SERVO BOARD
3 claws
2 DISC IN board
4 guide (disc)
1 screw
(PS 2x3)
6 two screws
(PTT 2x4)
7 screw
(PTT 2x4)
1 CN3
2 Removal the solders.
4 screw
(P 2x3)
5 loading motor assy
8 SERVO board
9 PICK-UP FLEXIBLE board
optical pick-up block
3 Unsolder the
lead wires.
black
yellow

9
CDX-L480N
1-9. FLOATING BLOCK ASSY
Fig. 1
1 tension spring (RA3)
2 arm (roller T)
3 retaining ring (roller)
4 bearing (roller)
5 shaft roller assy
retaining ring (roller) arm arm
washer (RA) washer (RA)
bearing (roller) bearing (roller)
7 LOAD board
6 screw
(PTT 2x4)
1 tension spring (KF1)
2 tension spring (KR1)
8 compression spring (FL)
7 floating block assy
9 compression spring (FL)
5 Fit lever (D) in the
direction of the arrow.
3 damper (T)
4 damper (T)
6 Turn loading ring in the
direction of the arrow.
1-8. SHAFT ROLLER ASSY
• When installing, take note of the positions
arm (roller) and washers. (Fig. 1)

10
CDX-L480N
1-10. OPTICAL PICK-UP BLOCK
1 two screws
(P 2x3)
4 screw
(P 2x3)
5 leaf spring (feed)
6 shaft (feed) assy
2 sled motor assy
3 optical pick-up block

11
CDX-L480N
SECTION 2
DIAGRAMS
2-1. IC PIN DESCRIPTION
• IC501 MN101C49KSG (SYSTEM CONTROL)
Pin No. Pin Name I/O Pin Description
1VREF– — A/D converter power supply (–) pin
2VSM I S-meter voltage detection input
3QUALITY I Noise detection input
4, 5 KEYIN1, 0 I Key input 1, 0
6RCIN0 I Rotary commander key input
7 to 9 NIL I Not used. (Fixed at L in this set)
10 VREF+ — A/D converter power supply (+) pin (+5V)
11 VDD — Power supply pin (+5 V)
12 OSCOUT O Main clock output (18.432 MHz)
13 OSCIN I Main clock input (18.432 MHz)
14 VSS — Ground
15 XIN I Sub clock input (32.768 kHz)
16 XOUT O Sub clock output (32.768 kHz)
17 MMOD I Not used. (Fixed at L in this set)
18 LCDSO O Serial data output for LCD driver IC.
19 LCDCE O Chip enable output for LCD driver IC.
20 LCDCKO O Serial clock output for LCD driver IC.
21 CD_TSO O Serial data output for CD servo IC.
22 CD_TSI I Serial data input from CD servo IC.
23 CD_TCKO O Serial clock output for CD servo IC.
24 SYSRST O Not used. (Fixed at H in this set)
25 BUSON O Not used. (Fixed at H in this set)
26 KEYACK I Key acknowledge detection input
27 DAVN I RDS data block synchronization detection input
28 BUIN I Backup power supply input
29 SIRCS I SIRCS input
30 TU_ATTIN I Tuner attenuator control input
31 CD_PACK I CD text pack synchronization signal input from CD servo IC.
32 NC (VCC) — Power supply pin (+5 V)
33 RESET I Microcomputer reset input
34 NOSE-SW I Not used. (Fixed at H in this set)
35 BEEP O Beep output
36 NC O Not used. (Open)
37 TESTIN I Test mode detection input
38 ACCIN I Accessory power supply detection input
39 NC O Not used. (Open)
40 TELATT I Telephone attenuator detection input
41 NC (VCC) I Not used. (Fixed at H in this set)
42 UNISO O Not used. (Open)
43 UNISI I Not used. (Fixed at L in this set)
44 UNICKO O Not used. (Fixed at L in this set)
45 I2C_SIO I/O I2C BUS serial data input/output
46 NC O Not used. (Open)
47 I2C_CKO O I2C BUS serial clock output
48, 49 NC O Not used. (Open)
50 CD_SELFSW I CD mechanism deck Self switch detection input
51 TSTB O CD text parameter strobe output for CD servo IC.
52 RFOK I RFOK signal input from CD servo IC.
53 CD_RST O Reset signal output for CD servo IC.
54 A0 O Command/parameter discrimination signal output for CD servo IC.
55 STB O Data strobe signal output for CD servo IC.

12
CDX-L480N
Pin No. Pin Name I/O Pin Description
56 X_EN O Not used. (Open)
57 LIMIT I CD mechanism deck Limit switch detection input
58 NCO O Not used. (Open)
59 D_SW I CD mechanism deck Down switch detection input
60 INSW I CD mechanism deck Disc in switch detection input
61 NC O Not used. (Open)
62 CD_LM_LO O CD mechanism deck loading motor control output (Loading direction)
63 CD_LM_EJ O CD mechanism deck loading motor control output (Eject direction)
64 to 66 NC O Not used. (Open)
67 ATT O System attenuator control output
68 DIAG I Mode input from power amp IC.
69 STB O Standby control output for power amp IC.
70 VOLATT O Electronic volume attenuator control output
71 to 74 NC O Not used. (Open)
75 DOOR-IND O Not used. (Open)
76 to 84 NC O Not used. (Open)
85 NS_MASK O Noise mask output
86 E2P_CKO O EEPROM serial clock output
87 E2P_SIO I/O EEPROM serial data input/output
88 TU-ATT O Tuner attenuator control output
89, 90 NC O Not used. (Open)
91 AD_ON O Key power supply control output
92, 93 NC O Not used. (Open)
94 PANEL_SW I Front panel OPEN/CLOSE detection input
95 DAVSS — D/A converter power supply (–) pin
96 COLSW I Not used. (Open)
97 FLASH_W I Flash microcomputer write detection input
98 RCIN1 I Rotary commander SHIFT key input
99 NC O Not used. (Open)
100 DAVDD — D/A converter power supply (+) pin (+5 V)

13 13
CDX-L480N
84
85
82
83
16
12
D/A
CONV
TRACKING
ERROR
FORCUS
ERROR
1
OSC
EFM
DEMOD
SERVO
CTL
RF
EQ
52
56
DSUB CODE
PROCESS
8
7
6
5
4
3
2
60
50
57
59
31
51
21
22
23
55
54
53
52
I/F
87
86
97
98
LD
DRIVE
Q1
FOCUS
COIL
DRIVE
TRACKING
COIL
DRIVE
SLED
MOTOR
DRIVE
SPINDLE
MOTOR
DRIVE
LOADING
MOTOR
DRIVE
6
5
23
2
16
15
17
18
13
14
11
12
9
10
26
62 63 64 65
63
62
33
M902
(SLED)
M901
(SPINDLE)
M903
(LOADING)
SW3
(LIMIT)
SW2
(SELF)
SW5
(DOWN)
SW1
(DISC IN)
X1
16.9344MHz
OPTICAL PICK-UP
(KSS-721A)
I-V
CONV.
CDL
CDR
CD PACK
TSTB
STB
AO
CD_TSO
CD_TSI
CD_TCKO
CD_RST
RFOK
INSW
LIMIT
CD_SELFSW
D_SW
CD_L_ LO
CD_LM_EJ
TUNER
SECTION
A
23 24
M
M
M
IC602
B.UP+B
LOUT
ROUT
PACK
TSTB
SI
RFOK
SO
SCK
STB
AO
RST
RESET
A
C
B
D
E
F
PD
LD
A
C
B
D
E
F
PD
LD
LD AMP
FOCUS
COIL
TRACKING
COIL
FD
FSC+
FSC-
TRK+
TRK-
SL-
SL+
SP-
SP+
LD-
LD+
TD
SD
MD
LOAD
EJECT
SYSTEM CONTROL
IC501 (1/3)
RF AMP,DIGITAL SERVO,
DIGITAL SIGNAL PROCESSOR
IC1
FOCUS/TRACKING COIL DRIVE,
SLED/SPINDLE/LOADING MOTOR DRIVE
IC2
FD TD SD MD
Signal path
: CD
A5V
AU5V
D5V
DR6V
SERVO 5V
MECH6V
+-
+-
+-
1
S702
RESET
RESET 3
2-2. BLOCK DIAGRAM — CD SECTION —
(Page 14)

1414
CDX-L480N
J1
(ANTENNA) 1ANT
CDL
CDR R-CH
3
R-CH
9
RDS 16 9
10
8
MPX
VDD
RDS DEMODULATOR
IC51
SDA
SCL
DAVN
4OSCO
5OSCI
AUDIO 8.3V
TUNER UNIT
TU1
6
S-METER
14
TU-SDA
SYSTEM CONTROL
IC501 (2/3)
67
ACCIN 38
TELATT 40
STB 69
BEEP 35
CD
SECTION
A
3
11
CN601
1
9
FL+
FL-
2
10
RL+
RL-
4
12
13
7
FR+
FR-
15
RR+
RR-
TEST
ACC
ATT
16 +B(BATT)
8GND
R-CH
F901
10A
TU-ATTIN
QUALITY
NS-MASK NC
BATT
17
19
18
BATT
3
E2P_CKO
86
VSM
13
TU-SCL
ATT
BATT
68
TESTIN
DIAG
37
2
VOLATT
70
SOUND CONTROL
ELECTRONIC VOLUME
IC401
VCC
NC
16
BUS-LCH
5
CD-LCH
9
TV-LCH
7
SDA
SCL
MUTE
CONT.
EVR
19
I2C_SIO
I2C_CKO
45
47
17
E2P-SDA
16
E2P-SCL
5
QUALITY
8
MUTE-CONDITION
7
TU-MUTE
11
TU-VDD
10
VCC(8.3V)
27
87 E2P_SIO
DAVN
85
30
TU-ATT
88
R-CH
25
29
AUDIO OUT REAR
-1
L
R
-2
R-CH
J330
5ANP-R
27
35
37
34
33
31
30
6ANT-R
BEEP
STB
4SCL
2SDA
CONT.
9
7
6
20
POWER AMP
IC750 (1/2)
MULTIPLE VOLTAGE
REGULATOR
IC750 (2/2)
AUDIO 8.3V
VP2
VP1
• Signal path
:FM
:CD
• R-ch is omitted due to same as L-ch.
12
SYSRST
B.UP+B
24
BUSON 25
UNISI 43
UNICKO 44
UNISO 42
BU IN 28
4
L-CH
OUT
-FL 13
OUT
-RL 12
+5V REG.
Q1
BACK-UP CHECK/
LOW VOLTAGE
CHECK
Q581,582
OVER VOLTAGE
DET.
Q580,D580,581
LINE MUTE
CONTROL
Q478,479
TEL
ATT
Q651
I2C
BUS
ACC
DETECT
Q631
MUTE
Q441
MUTE
Q461
11
MUTE
TONE
INPUT SELECTOR
EFFECT
Q22
X51
4.332MHz
5
3
DIAG
AMP-REM
ANT-REM
B.UP+B
PANEL+B
MECH 6V
SERVO 5V
AUDIO 8.3V
B.UP+B
PANEL+B
MECH 6V
SERVO 5V
AUDIO 8.3V
VP
D759
D760
MUTE
16
22
I2C
BUS
21
20
2-3. BLOCK DIAGRAM — TUNER SECTION —
(Page 13)

15 15
CDX-L480N
2-4. BLOCK DIAGRAM — DISPLAY SECTION — 2-5. CIRCUIT BOARDS LOCATION
LSW904,905,
LSW907-911,
LSW913-921
S900-903,906,912
KEY
ACTIVE
Q664
REMOTE
RECEIVE
IC971
X502
32.768kHz
15
16
12
13
518
20
19
4
26
91
98
6
29
SYSTEM CONTROL
IC501 (3/3)
LCD DRIVER
IC901
KEYIN0 DATA
CLK
CE
LCDSO
LCDCKO
LCDCE
KEYIN1
KEY ACK
AD_ON
RCIN1
RCIN0
SIRCS
XIN
XOUT
OSCOUT
OSCIN
X501
18.432MHz
63
64
62
COM1
COM4
LCD
LCD901
PANEL+B
PANEL+B
LSW904,905,907-911,
913-921
LED900-903,906,912,
951,952
LED931,932
(LCD BACK LIGHT)
D502
D501
52
|
55
|
SEG1
SEG46
|
DI
CL
CE
B.UP+B
KEY
ILLUMINATION
()
KEY MATRIX
2
2
I
25
•
27
I
38
•
40
I
49
MAIN board
SERVO board
LIMIT board
SUB (CD) board
tuner uni
t
(TU1)
DISC IN board
KEY board
LOAD board
IC1 uj (RFO)
• Waveforms
— Servo Board —
(MODE: CD PLAY)
1
2
3
IC1 ts (PACK)
0V
1.8Vp-p
16.9344MHz
IC1 wd (XTAL)
0V
4
Approx. 620mVp-p
IC1 oa (FEO)
5
Approx. 200mVp-p
IC1 od (TEO)
2.4Vp-p
4.8Vp-p
3.4msec
32.768kHz
IC501 qh (XOUT)
— Main Board —
1
2
3
18.432MHz
IC501 qs (OSCOUT)
5Vp-p
4.332MHz
IC51 4(OSCO)
4.5Vp-p
2.3Vp-p

1616
CDX-L480N
1
A
B
C
D
E
F
G
H
I
234567891011121314
CN2
2-6. PRINTED WIRING BOARDS — CD MECHANISM SECTION — • Refer to page 15 for Circuit Boards Location. : Uses unleaded solder.
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
for schematic diagram:
•All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
•All resistors are in Ωand 1/4W or less unless otherwise
specified.
•%: indicates tolerance.
•f: internal component.
•C: panel designation.
•A: B+ Line.
•Powervoltageis dc 14.4V and fed withregulateddcpower
supply from ACC and BATT cords.
•Voltagesare taken with a VOM(Inputimpedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
•Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
•Circled numbers refer to waveforms.
•Signal path.
F: FM
f: AM
J: CD
for printed wiring boards:
•X: parts extracted from the component side.
•Y: parts extracted from the conductor side.
•a: Through hole.
•: Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
Note: The components identified by mark 0or dotted line
with mark 0are critical for safety.
Replace only with part number specified.
Caution:
Pattern face side: Parts onthepatternfacesideseenfromthe
(Side B) pattern face are indicated.
Parts face side: Parts on the parts face side seen from the
(Side A) parts face are indicated.

17 17
CDX-L480N
1
A
B
C
D
E
F
G
H
I
234567891011121314
SW4
TP8
C4
C26
TP1
TP2 TP3
TP4
TP5
TP87
TP86
M903
TP57
TP77
TP11
TP79
TP83
TP70
TP10
TP9
TP27
TP12
TP78
TP31
TP81
TP84
TP54
TP25
TP24
TP37
TP39
TP36
TP38
TP40
TP45
TP22
TP88
TP41
TP46
TP30 TP21
M902 M901
CN1
TP17
TP20
TP42
C44
TP19
TP28
TP90
C41
TP29
TP15
TP33
TP73
TP14
TP18
TP48
TP71
TP51
TP49
TP52
TP55
TP75
TP53
TP56
TP43
TP58
TP61
TP74
TP60
TP68
TP80
TP7
TP62
TP91
TP63
TP66
TP64
TP69
TP72
TP50
TP26
TP32
TP59
TP76
BP4
BP3
BP1
BP2
R8
R9
R5
R7
R12
R14
R15
R10
R17
R18
R19
R20 R22
TP92
FB5
C3
C5
C6
C8
C9 C10
C11
C13
C14
C16
C18
C19
C24
C25
C29
C34
C36
C38
C35
C22
C30
TP6
C23
C1
C27
R21
TP47
C15 C20
TP35
TP23
R6
C17
TP82
TP44
Q1
R26
TP34
TP89
R3
TP16
TP85
R31
CN1
IC1
IC2
C43
R30
R29
CN3
X1
C70
C71
SW3
SW1
SW2
(Page 19)
: Uses unleaded solder.

1818
CDX-L480N
IC B/D
IC B/D
TP77
TP78
R29
R30
C43
TP79
TP80
TP81
TP82
TP83
TP84
CN2
CN3
SW3
M902
M901
SW2
SW1
TP2
TP3
M903
TP87
TP86
TP9 TP8
R3 R26
C4
TP10
C13
R5
C11
C10
C8
TP7
TP92
R6
TP15
TP14
TP17
TP20
TP16
TP19
TP21
TP18
BP4
BP3
R7
C17
TP11
TP12 C9
C14
TP89
C19
C20 C23
R9
R8
TP22
TP23
TP24
TP25
TP88
C26
TP31
BP1
BP2
TP33
TP32
R14
R15
TP30
R12
R10
TP91
TP90
TP29
TP28
TP26
TP27
R21
R22
R31
C44
TP34
TP35
TP36
TP46
TP37
TP38
TP39
TP40
TP41
TP42
TP43
TP44
TP45
CN1
R18
R19
R20
R17
TP66
TP62
TP47
TP63
TP48
TP49
TP64
TP50
TP51
TP52
TP68
TP53
TP69
TP54
TP70
TP55
TP71
TP56
TP72
TP57
TP73
TP58
TP74
TP59
TP75
TP60
TP76
TP61
IC1
X1
C1 C5 C3
TP93
TP94
TP95
TP96
TP97
TP98
TP85
C15
C16C70
C24
C35
C38
C36
FB5
C25
C34
C71
C29
C27
C41
C22
C30
C18
Q1
IC2
CN1
C6
TP1
TP4
TP5
SW4
2-7. SCHEMATIC DIAGRAM — CD MECHANISM SECTION — • Refer to page 15 for Waveforms and page 16 for Common Note on Schematic Diagram.
• Refer to page 24 for IC Block Diagrams.
Note:
•Voltage is dc with respect to
ground under no-signal conditions.
no mark : CD PLAY
(Page 21)

19 19
CDX-L480N
1
A
B
C
D
E
F
G
H
I
J
234567891011 12 13 14
Q431
Q441
Q478
Q479
Q651
R508
R509 C506
C505
R513
R514
D501
C621
C504
C508
C507
R510
R511 R512
Q664
R517
R518
R523
R524
R525
R526
R527
R528
R530
JC532
JC401
JC21
JC407
C413
R405
R406
R407
R409 R408
JC20
D1
C6
JC1
R2
R3
C2
C1
Q22
R29
JC59
R60
C58
C59
C62
IC51
C54
R54
R56
C55
C56
R57
R62
R61
C64
R501
R533
C501
R503
D502
R582
D580
D761
D762
R651
R653
R654
D651
R609
D609
R632
R634
R633
Q631
R636
Q580
JC582
JC631
JC609
JC651
R521
R522
JC581
D581
R583
R532
JC754
JC88
R531
D715
D711
JC533
R441
R431 R461
R451
JC444
JC441
JC431
C331
C751
JC753
R432
R442
C57
R502
R515
R516
C343
D752
JC53
JC580
R674
R671
R672
C602
JC530
R534
JC755
R756
C755
R752
C7
R479
R480
C480
D480
D479
JC479
JC406
D755
D756
R433
R443
R1
C764
C765
C334
C335
C404
C405
C617
C618
C61
C452
C462
C432
C442
C756
Q1
IC501
R453
Q451
R452
C333C332
R462
Q461
R463
JC29
IC602
FMB3
FMB4
C8
C11
C9
D712
C420
C421
C509
R720
R504
R505
R673
L303
L302
L1
L502
R999
L305
L306
JC303
L304
L307
JC756
IC401
JC304
R585
R584
R540
R541
R535
R536
Q582
Q581
JW1
JW2
JW3
JW4
JW5
JW7
JW8
JW10
JW11
JW12
JW13
JW14
JW15
JW16
JW17
JW18
JW19
JW20
JW21
JW22
JW23
JW24
JW25
JW26
JW27
JW29
JW30
JW31
JW32
JW36
JW37
JW38
JW39
JW40
JW41
JW42
JW44
JW45
JW46
JW48
JW49
JW50
JW51
JW52
JW53
JW54
JW55
JW56
JW57
JW58
JW59
JW61
JW62
JW63
JW64
JW65
JW69
JW70
JW71
JW73
JW74
JW76
JW77
JW78
JW80
JW81
JW82
JW83
JW84
JW85
JW86
JW87
JW88
JW89
JW90
JW91
JW96
JW100
JW101
R631
L501
JW103
JW104
JW105
J561
CN601
F901
JW6
J330
C431
C461
C451
JW102
C3 C401
C4
JW93
D719
D716
D717
D718
D720
D710
X501
C503
JW67
JW66
S702
CNP301
C301
C305
C302
R652
C601
L601
J1
TU1
C51
X51
C5
C412
C479
C761
C757
C303
X502
C758
C441
C622
C623
R520
D757
D759
D760
D601
C631
JW9
D758
D751
D753
JW68
C760
C759
IC750
JW92
JW28
JW106
JW107
JW108
C753
C754
D754
JW109
JW110
JW99
JW98
R539
JW95
JW97
L301
C407
C406
2-8. PRINTED WIRING BOARD — MAIN SECTION — • Refer to page 15 for Circuit Boards Location and page 16 for Common Note on Printed Wiring Boards. : Uses unleaded solder.
(Page 22)
(Page 17)
D758 D-6
D759 D-8
D760 D-8
D761 D-9
D762 D-9
IC51 G-3
IC401 E-4
IC501 H-6
IC602 J-8
IC750 B-6
Q1 F-3
Q22 E-2
Q431 C-3
Q441 C-4
Q451 C-4
Q461 C-3
Q478 E-5
Q479 E-5
Q580 E-10
Q581 E-10
Q582 E-10
Q631 F-8
Q651 D-8
Q664 H-8
Ref. No. Location
D1 F-3
D479 E-5
D480 E-6
D501 I-7
D502 I-6
D580 E-10
D581 E-10
D601 D-9
D609 D-9
D651 D-8
D710 I-2
D711 I-3
D712 I-2
D715 I-4
D716 I-3
D717 I-3
D718 I-3
D719 I-3
D720 I-2
D751 D-7
D752 B-7
D753 D-7
D754 D-7
D755 C-5
D756 D-5
D757 D-6
• Semiconductor Location
Ref. No. Location

2020
CDX-L480N
2-9. SCHEMATIC DIAGRAM — MAIN SECTION (1/2) — • Refer to page 15 for Waveforms and page 16 for Common Note on Schematic Diagram.
• Refer to page 24 for IC Block Diagrams.
Note:
•Voltage is dc with respect to ground under no-signal
(detuned) condition.
no mark : FM
():AM
<>:CD PLAY
∗: Impossible to measure
(Page 21)
IC B/D
IC B/D
IC B/D
C51
C412
C479
C631
C758
D752
D755
D756
D757
D759
D760
R60
R406
R407
R408
R409
R431 R433
R441 R443
R451 R453
R461 R463
R479
R480
R752
R61
R62
D761
D762
R452
R442
R462
R54
R1
R634
R633 R654
R653 R651
D651
D751
D758
D753
D754
JC29
C3
C64
C59
C62
C61
C58
C56
C54
C421
C404
C405
JC406
C420
C413
JC441
JC431 C432
C452
C442
C462
JC755
C480
R631
JC754
JC753
C751
C765 C764
C617
C602
C618
C6
R652
D480
Q479
Q478
JC479
JC444
Q461
Q441
JC59C5
D1
C4 C1
JC1
C57
Q451
R432
Q431
Q631
Q651
JC756
D609
D601
C756
R756
L1
X51
R57
R56
R636
R3
R2
J1
R29
Q22
D479
F901
C7
R609
L601
R632
C759
C760
C761
C757
C754
Q1
C755
CN601
JC651
JC631
JC609
C2
C55
C601
R405
IC51
J330
IC750
TU1
C11
JC20
C8C9
IC401
C401
C406
JC407C407
C431
C451
C441
C461
C753
C332
C333
C334
C335