Sony CDX-L450V - Fm/am Compact Disc Player User manual

1
Model Name Using Similar Mechanism CDX-L450X/L470X
CD Drive Mechanism Type MG-393X-121//K
Optical Pick-up Name KSS-720A
SERVICE MANUAL
CDX-L450V
FM/AM COMPACT DISC PLAYER
• The CD sections have no adjustments.
CD player section
Signal-to-noise ratio 90 dB
Frequency response 10 – 20,000 Hz
Wow and flutter Below measurable limit
Tuner section
FM
Tuning range FM tuning interval:
50 kHz/200 kHz
switchable
87.5 – 108 MHz
(at 50 kHz step)
87.5 – 107.9 MHz
(at 200 kHz step)
Antenna terminal External antenna connector
Intermediate frequency 10.7 MHz
Usable sensitivity 11 dBf
Selectivity 75 dB at 400 kHz
Signal-to-noise ratio 65 dB (stereo),
68 dB (mono)
Harmonic distortion at 1 kHz
0.7% (stereo),
0.5% (mono)
Separation 33 dB at 1 kHz
Frequency response 30 – 15,000 Hz
AM
Tuning range AM tuning interval:
9 kHz/10 kHz
switchable
531 – 1,602 kHz
(at 9 kHz step)
530 – 1,710 kHz
(at 10 kHz step)
Antenna terminal External antenna connector
Intermediate frequency 10.7 MHz/450 kHz
Sensitivity 30 µV
SPECIFICATIONS
Power amplifier section
Outputs Speaker outputs
(sure seal connectors)
Speaker impedance 4 – 8 ohms
Maximum power output 50 W ×4 (at 4 ohms)
General
Outputs Audio output
Power amplifier control
lead
Power aerial relay control
lead
Tone controls Bass ±9 dB at 100 Hz
Treble ±9 dB at 10 kHz
Power requirements 12 V DC car battery
(negative earth)
Dimensions Approx. 178 ×50 ×176 mm
(w/h/d)
Mounting dimensions Approx. 182 ×53 ×161 mm
(w/h/d)
Mass Approx. 1.2 kg
Supplied accessories Parts for installation and
connections (1 set)
Front panel case (1)
Note
This unit cannot be connected to a digital
preamplifier or an equalizer.
Design and specifications are subject to change without
notice.
Ver 1.1 2001. 11
Sony Corporation
e Vehicle Company
Published by Sony Engineering Corporation
9-873-251-02
2001K0400-1
© 2001. 11
E Model

2
optical pick-up bloc
k
semi-fixed resistor
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.
SERVICE NOTES
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
damaged by heat.
If the optical pick-up block is defective, please replace the whole
optical pick-up block.
Never turn the semi-fixed resistor located at the side of optical
pick-up block.
CDX-L450V
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.

3
TABLE OF CONTENTS
1. GENERAL
Location of controls................................................................. 4
Getting Started......................................................................... 4
CD Player ................................................................................ 5
Radio ....................................................................................... 5
Other Functions ....................................................................... 6
Connections ............................................................................. 7
2. DISASSEMBLY
2-1. Sub Panel Assy .................................................................... 9
2-2. CD Mechanism Block .......................................................10
2-3. Main Board ....................................................................... 10
2-4. Heat Sink ........................................................................... 11
2-5. Chassis (T) Sub Assy ........................................................ 11
2-6. Lever Section .................................................................... 12
2-7. Servo Board....................................................................... 12
2-8. Shaft Roller Assy .............................................................. 13
2-9. Floating Block Assy .......................................................... 13
2-10. Optical Pick-up Block .......................................................14
3. ELECTRICAL ADJUSTMENTS................................. 15
4. DIAGRAMS
4-1. IC Pin Description............................................................. 17
4-2. Block Diagram –CD Section–........................................... 19
4-3. Block Diagram –Tuner Section– ....................................... 20
4-4. Block Diagram –Display Section–.................................... 21
4-5. Circuit Boards Location .................................................... 21
4-6. Printed Wiring Boards –CD Mechanism Section–............ 22
4-7. Schematic Diagram –CD Mechanism Section– ................ 24
4-8. Printed Wiring Board –Main Section– .............................. 25
4-9. Schematic Diagram –Main Section (1/2)– ........................ 26
4-10. Schematic Diagram –Main Section (2/2)– ........................ 27
4-11. Printed Wiring Board –Display Section– .......................... 28
4-12. Schematic Diagram –Display Section–............................. 29
5. EXPLODED VIEWS
5-1. Chassis Section ................................................................. 32
5-2. Front Panel Section ...........................................................33
5-3. CD Mechanism Section (1) ............................................... 34
5-4. CD Mechanism Section (2) ............................................... 35
5-5. CD Mechanism Section (3) ............................................... 36
6. ELECTRICAL PARTS LIST ........................................ 37
CDX-L450V

4
CDX-L450V SECTION 1
GENERAL This section is extracted
from instruction manual.

5
CDX-L450V

6
CDX-L450V
Connections

7
CDX-L450V

8
CDX-L450V

9
CDX-L450V
SECTION 2
DISASSEMBLY
Note : This set can be disassemble according to the following sequence.
2-1. SUB PANEL ASSY
Set Sub Panel Assy CD Mechanism Block
Chassis (T) Sub Assy Lever Section
Servo Board
Shaft Roller Assy
Floating Block Assy Optical Pick-up Block
Main Board Heat Sink
1 PTT 2.6x6
2 PTT 2.6x6
3 claw
5 sub panel assy
4 claws
three claws

10
CDX-L450V
3 screw (+BTT)
4 screws (+BTT)
1 PTT 2.6x8
5 MAIN board
2 PTT 2.6x
8
1 PTT 2.6x6
6 PTT 2.6x
6
7 bracket (CD)
2 PTT 2.6x6
5 CD mechanism block
4 CNP701
3
2-3. MAIN BOARD
2-2. CD MECHANISM BLOCK

11
CDX-L450V
4 chassis (T) sub assy
3 P 2x3
2 P 2x3
1 Unsolder the
lead wires.
black
red
white
6 heat sink
1 PTT 2.6x8
2 PTT 2.6x8
4 PTT 2.6x8
3 PTT 2.6x12
5 PTT 2.6x8
2-5. CHASSIS (T) SUB ASSY
2-4. HEAT SINK

12
CDX-L450V
6 special screws
1 CN3
3 Removal the solders.
4 P 2x3
5 loading motor assy
8 SERVO board
2 CN2
7 special screw
4 claws
2 IN SELF SW board
7 lever (L)
3 tension spring (LR)
6 lever (R)
5 guide (disc)
1 special screw
2-6. LEVER SECTION
2-7. SERVO BOARD

13
CDX-L450V
1 tension spring (KF1)
7 compression spring (FL)
6 floating block assy
8 compression spring (FL)
4 Fit lever (D) in the
direction of the arrow.
2 damper (T)
3 damper (T)
5 Turn loading ring in the
direction of the arrow.
Fig. 1
1 tension spring (RA)
2 arm (roller)
3 retaing ring (RA)
4 shaft retainer
5 shaft roller assy
retaing ring (RA) arm arm
washer washer shaft retaine
r
shaft retainer
2-9. FLOATING BLOCK ASSY
2-8. SHAFT ROLLER ASSY
• When installing, take note of the positions
arm (roller) and washers. (Fig. 1)

14
CDX-L450V
1 P 2x3
5 P 2x3
6 spring (feed), plate
7 shaft (feed) assy
2 sled motor assy
3 optical pick-up block
4 pick-up flexible board
2-10. OPTICAL PICK-UP BLOCK

15
CDX-L450V
TUNER SECTION
Cautions during repair
When the tuner unit is defective, replace it by a new one because
its internal block is difficult to repair.
Procedure :
1. Set to the test mode.
2. Push the SRC button and set to FM.
FM Auto Scan/Stop Level Adjustment
Setting :
SOURCE button : FM
FREQUENCY SELECT switch : FM 50k
3. Adjust with the volume RV2 on TU601 so that the “FM”
indication turns to “FM0” indication on the display window.
But, in case of already indicated “FM0”, turn the RV2 so that
put out light “0” indication and adjustment.
Adjustment Location : See page 16.
0 dB = 1 µV
Note on Adjustment
The adjustments of tuner section, should be performed according
to the following sequence.
1. FMAuto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. AM Auto Scan/Stop LevelAdjustment
Carrier frequency : 98.0 MHz
Output level : 22 dB (12.6 µV)
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%)
TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level andAMAuto Scan/Stop Level check can be
performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Turn ON the regulated power supply to ACC and BATT
terminals is “OFF” position (display 1:00).
2. Push the preset 4 button.
3. Push the preset 5 button.
4. Press the preset 1 button for more than two seconds.
5. Then the display and LED on the front panel indicates all lights,
the test mode is set.
<Release the Test Mode>
1. Push the OFF button.
SECTION 3
ELECTRICAL ADJUSTMENTS
antenna
terminal
FM RF signal
generator
0.01
µ F
set
FM 97.00
Z
ST SHUF
8
Display
Z
FM0Z 97.00
Z
ST SHUF
8
Display
Z

16
CDX-L450V
AM Auto Scan/Stop Level Check
Note : This adjustment should be performed after the FM Auto
Scan / Stop Level Adjustment is done.
Setting :
SOURCE tMODE button : AM
FREQUENCY SELECT switch : AM 9k
Carrier frequency : 999 kHz
Output level : 30 dB (44.7 µV)
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%)
Procedure :
1. Set to the test mode. (See page 15)
2. Push the SRC button.
3. Push the MODE button and set to AM.
4. Check that the “AM”indication turns to “AM0”indication on
the display window.
FM Stereo Separation Adjustment
Setting :
SOURCE button : FM
FREQUENCY SELECT switch : FM 50k
Carrier frequency : 98.0 MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main :1 kHz, 33.75 kHz deviation (45%)
sub :1 kHz, 33.75 kHz deviation (45%)
19 kHz pilot : 7.5 kHz deviation (10%)
L-CH stereo separation : A–B
R-CH stereo separation : C–D
The separations of both channels should be equal.
Specification : Separation more than 24 dB
Adjustment Location :
FM stereo Level meter Level meter
signal generator connection reading (dB)
output channel
L-CH L-CH A
B
R-CH L-CH Adjust RV1 on TU601
for maximum reading.
R-CH R-CH C
D
L-CH R-CH Adjust RV1 on TU601
for maximum reading.
Procedure :
antenna
terminal
0.01
µ Fset
level mete
r
FM RF signal
generator
AUDIO OUT REAR
10 k Ω
RV1
FM Stereo Separation
Adjustment
RV2
FM Auto Scan/Stop
Level Adjustment
TU601(Component Side)
antenna
terminal
set
AM RF signal
generator AM dummy
antenna (50
Ω )
65 pF
15 pF
set
30
Ω
AM 999
ST SHUF
Display
AM0Z 999
SHUF
ST
Display

17
CDX-L450V
4-1. IC PIN DESCRIPTION
•IC801 µPD780024AGK-B26-9ET (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Pin Description
1 D SW I Down switch detection input
2 IN SW I Disc in switch detection input
3 PH3 I PH3 detection input (Not used in this set)
4 LM LD O Loading motor drive output (Loading)
5 LM EJ O Loading motor drive output (Eject)
6 AATT O Power amplifier mute control output
7 ATT O Line out mute control output
8 BEEP O BEEP output
9 VSSO —Ground
10 VDDO —Power supply pin (+5 V)
11 VOL CLK O Electric volume clock output
12 VOL DO O Electric volume data out output
13 VOL CE O Electric volume chip enable output
14 AM ON O Tuner AM power supply control output
15 FM ON O Tuner FM power supply control output
16 NOSE I Front panel attachment detection input
17 PLL DI I PLL IC data input
18 LCD DO O LCD data output
19 LCD CE O LCD chip enable output
20 LCD CLK O LCD clock output
21 PLL CLK O PLL IC clock output
22 PLL DO O PLL IC data output
23 PLL CE O PLL IC chip enable output
24 VDD1 —Power supply pin (+5 V)
25 AVSS —Ground
26 ST IND I FM STEREO detection input
27 FUN SEL I Function select input
28 S METER I S meter signal input
29, 30 KEY0, 1 I A/D key input 0, 1
31 TELATT I Attenuator signal input
32 DST SEL I Destination select input
33 TEST I Force test mode input
34 AVREF —A/D converter power supply pin (+5 V)
35 AVDD —A/D converter power supply pin (+5 V)
36 RESET I Reset input
37 XT2 O Sub clock output (32.768 kHz)
38 XT1 I Sub clock input (32.768 kHz)
39 IC —Connect to Ground in this set.
40 X2 O Master clock output (8.38 MHz)
41 X1 I Master clock input (8.38 MHz)
42 VSS1 —Ground
43 KEYACK I Key acknowledge detection input
44 SIRCS I SIRCS input
45 SELF SW I Self switch detection input
46 BU IN I Backup power supply detection input
47 AD ON O Key power supply control output
48 ILL ON O Illumination power supply control output
49 AMP ON O Amplifier remote power supply control output
50 CDM ON O CD mechanism deck power supply control output
51 XCD ON O CD DSP IC 16 MHz X’tal ON/OFF control output
52 TU ON O Tuner power supply control output
SECTION 4
DIAGRAMS

18
CDX-L450V
Pin No. Pin Name I/O Pin Description
53 P.ON O System power supply control output
54 X SO O CD DSP IC serial data output
55 X SI I CD DSP IC serial data input
56 X SCK O CD DSP IC serial clock output
57 RFOK I CD servo IC RFOK signal input
58 X RST O CD DSP IC reset control output
59 ACC IN I Accessory power supply detection input
60 AO O CD servo IC command/pallameter discrimination signal output
61 STB O CD servo IC data strobe signal output
62 XEN O CD DSP IC X’tal control output
63 L SW I Limit switch detection input
64 PH1 I PH1 detection input (Not used in this set)

19 19
CDX-L450V
82
83
84
85
16
12
D/A
CONV
TRACKING
ERROR
FORCUS
ERROR
9
1
OSC
EFM
DEMOD
SERVO
CTL
RF
EQ
52
56
54
55
DSUB CODE
PROCESS
8
7
6
5
4
3
2
62
1
45
2
63
50
51
54
55
56
61
60
58
57
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
15
16
17
18
13
14
11
12
9
10
26
62 63 64 65
5
4
36
POWER
CONTROL
Q905,906
POWER
CONTROL
Q921
REG
Q907,D908
REG
Q910,D910
M902
(SLED)
M901
(SPINDLE)
M903
(LOADING)
SW3
(DISC IN)
SW2
(SELF)
SW4
(LIMIT)
SW1
(DOWN)
X1
16.9344MHz
OPTICAL PICK-UP
KSS-720A
I-V
CONV.
CDL
STB
A0
X_SO
X_SI
X_SCK
X_RST
RFOK
XEN
D_SW
IN_SW
SELF_SW
L_SW
LM _LO
LM_ EJ
CDM ON
XCD_ON
R-CH
TUNER
SECTION
A
23 24
M
M
M
1RESET
S901
RESET
2
IC902
U_COM+5V
BATT
D909
LOUT
ROUT
PACK
TSTB
TSI
TSCK
SI
RFOK
SO
SCK
STB
AO
XTALEN
RST
RESET
A
C
B
D
E
F
PD
LD
A
C
B
D
E
F
PD
LD
APC
FCS-
FCS+
TRK+
TRK-
SL-
SL+
SP+
SP-
LD-
LD+
FOCUS
COIL
TRACKING
COIL
FD
TD
SD
MD
LOAD
EJECT
SYSTEM CONTROL
IC801(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
A_5V
AU_5V
D_5V
DR_6V
4-2. BLOCK DIAGRAM — CD SECTION —
(Page 20)

2020
CDX-L450V
CNJ601
(ANTENNA) 2 16
1
FM_ANT L-CH
17
R-CH
CDL
24
DET_OUT
11
FM/AM_OSC
14
AM_VT
6
FM_VT
20
IF_CONT
19
OSC-IN
21
12
9
S_METER
TU+B
22
SD/ST_IND
FM_VCC
AM_VCC
PLL VCC
AM_ANT
TUNER UNIT
TU601
11
12
13
2
1
36
17
21
18
14
5
SYSTEM CONTROL
IC801 (2/3)
PLL
IC601
ELECTRONIC VOLUME
IC401
LF OUT
4
33
34
LR OUT
RF OUT R-CH
RR OUT
8
BEEP
ATT
53
7
P.ON
6
A_ATT
59
ACC IN
L5
L1
L2
R2
CE
DI
CL
VOL_CLK
VOL_DO
VOL_CE
17
22
21
PLL_DI
PLL_DO
PLL_CLK
23 PLL_CE
LCL
Q601
D601
DST_SEL
S_METER
FM 200k
AM 10k
FM 50k
AM 9k
FREQUENCY
SELECT
FM POWER
CONTROL
Q605,606 SW801
SD_IND
AUDIO OUT REAR
CD
SECTION
A
MUTE
CONT
Q401,402
Q102
MUTE
R-CH
DELAY BATT
BATT
Q909
BATT
D402
Q101
MUTE
22 MUTE
4STBY
16 AUX-IN
11
12 5
3
9
7
POWER AMP
IC101
1
9
2
10
CNP501
R-CH
PJ401
FL+
FL-
RL+
RL-
4
12
FR+
FR-
3
11
RR+
RR-
16 +B (BATT)
5AMP REM
6
8
19
ANT REM
GND
R-CH
F901
10A
7ACC
15 TEST
33
TEST
AMP_ON
ACC
CHECK
Q902
32
26
28
()
17
18
L
R
•Signal path
:FM
:AM
:CD
•Rch :same as L-ch.
ANT REMOTE
CONTROL
Q911,917
BACK-UP CHECK
Q903,904,D906,907
TUNER+8V REG
Q912,913,D913
COM+8V REG
Q918,919,929,D923
U_COM+5 V REG
Q920,D930,D999
U_COM+5V
COM+8V
TU+B
R-CH
8
FM_VCO
15
AM_VCO
16
FM_CP
18
VT
19
AM_CP
20
OSC
2
SEEK XO
XI
10
IFC
13
MONO
11 24
1
CE 3
CK 5
D_IN 4
D_OUT 6
X601
10.25MHz
4
3
AM_DX/LCL
FM_DX/LCL
52
TU_ON
46
BU_IN
15
FM_ON
14
AM_ON
49
AM POWER
CONTROL
Q603,604
TUNER
+5V REG
D604
4-3. BLOCK DIAGRAM — TUNER SECTION —
(Page 19)