Sony CDX-4270-R Service manual
CDX-4270R
SERVICE MANUAL
SPECIFICATIONS
AEP Model
UK Model
Model Name Using Similar Mechanism CDX-4180R
CD Drive Mechanism Type MG-363X-121
Optical Pick-up Name KSS-521A
CD player section
System Compact disc digital audio
system
Signal-to-noise ratio 90 dB
Frequency response 10 – 20,000 Hz
Wow and flutter Below measurable limit
Tuner section
FM
Tuning range 87.5 – 108.0 MHz
Aerial terminal External aerial connector
Intermediate frequency 10.7 MHz
Usable sensitivity 12 dBf
Selectivity 75 dB at 400 kHz
Signal-to-noise ratio 65 dB (stereo),
68 dB (mono)
Harmonic distortion at 1 kHz
0.8% (stereo),
0.6% (mono)
Separation 35 dB at 1 kHz
Frequency response 30 – 15,000 Hz
MW/LW
Tuning range MW: 531 – 1,602 kHz
LW: 153 – 281 kHz
Aerial terminal External aerial connector
Intermediate frequency 10.7 MHz / 450 kHz
Sensitivity MW: 30 µV
LW: 50 µV
Power amplifier section
Outputs Speaker outputs
(sure seal connectors)
Speaker impedance 4 – 8 ohms
Maximum power output 40 W × 4 (at 4 ohms)
General
Outputs Line output (1)
Power aerial relay control
lead
Power amplifier control
lead
Telephone ATT control
lead
Tone controls Bass ±8 dB at 100 Hz
Treble ±8 dB at 10 kHz
Power requirements 12 V DC car battery
(negative ground)
Dimensions Approx. 178 × 50 × 185 mm
(w/h/d)
Mounting dimension Approx. 182 × 53 × 162 mm
(w/h/d)
Mass Approx. 1.2 kg
Supplied accessories Parts for installation and
connections (1 set)
Front panel case (1)
Design and specifications are subject to change without
notice.
MICROFILM
FM/MW/LW COMPACT DISC PLAYER
1
SERVICE NOTE
CAUTION
Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.
NOTE FOR REPLACEMENT OF COMPLETE MAIN BOARD
The complete MAIN board (A-3294-759-A) of this set can be set to
address the specification for each destination by shorting or opening one solder bridge of the MAIN board on the AEP and UK models and German models :
AEP and UK models : short
German model : open
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.
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 pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.
NOTES ON PICK-UP FLEXIBLE BOARD
The pick-up flexible board in this set is secured to the optical pickup with an adhesive tape. Once the tape is removed, an adhering
force becomes weak, and it cannot be reused.
Therefore, if the optical pick-up is replaced, replace also the pickup flexible board with a new one.
The solder bridge below shold be opened when replacing the complete MAIN board on the German model.
– main board (side B) –
Solder bridge
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE
WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
P ART NUMBERS APPEAR AS SHOWN IN THIS MANU AL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
2
TABLE OF CONTENTS
1. GENERAL
Location of controls................................................................. 4
Getting Started......................................................................... 4
Setting the clock ......................................................................4
CD Player ................................................................................ 4
Radio ....................................................................................... 5
RDS ......................................................................................... 5
Other Functions .......................................................................6
Connections .............................................................................8
2. DISASSEMBLY
2-1. Cover ................................................................................. 10
2-2. Front Panel Assy ............................................................... 10
2-3. Sub Panel (1) Assy ............................................................ 11
2-4. CD Mechanism Block ....................................................... 11
2-5. Main Board ....................................................................... 12
2-6. Heat Sink ........................................................................... 12
2-7. Chassis (T) Sub Assy ........................................................ 13
2-8. Lever Assy ......................................................................... 13
2-9. Servo Board....................................................................... 14
2-10. Roller Assy........................................................................ 14
2-11. Chassis (OP) (O/S) Assy ................................................... 15
2-12. Optical Pick-up Block ....................................................... 15
3. ELECTRICAL ADJUSTMENTS
Tuner Section......................................................................... 16
CD Section ............................................................................ 19
4. DIAGRAMS
4-1. IC Pin Description............................................................. 20
4-2. Block Diagram –CD Section–........................................... 22
4-3. Block Diagram –Tuner Section–....................................... 23
4-4. Block Diagram –Display Section–.................................... 24
4-5. Circuit Boards Location .................................................... 25
4-6. Printed Wiring Boards –CD Mechanism Section–............ 26
4-7. Schematic Diagram –CD Mechanism Section– ................ 27
4-8. Printed Wiring Board –Main Section–.............................. 28
4-9. Schematic Diagram –Main Section (1/3)– ........................ 30
4-10. Schematic Diagram –Main Section (2/3)– ........................ 31
4-11. Schematic Diagram –Main Section (3/3)– ........................ 32
4-12. Schematic Diagram –Display Section–............................. 33
4-13. Printed Wiring Board –Display Section– .......................... 34
5. EXPLODED VIEWS
5-1. Chassis Section ................................................................. 39
5-2. Front Panel Section ........................................................... 40
5-3. CD Mechanism Section (1) ............................................... 41
5-4. CD Mechanism Section (2) ............................................... 42
5-5. CD Mechanism Section (3) ............................................... 43
6. ELECTRICAL PARTS LIST ........................................ 44
3
SECTION 1
GENERAL
This section is extracted
from instruction manual.
4
56789
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. COVER
1
claw
4
cover
3
claws
2
claw
2-2. FRONT PANEL ASSY
1
2
front panel assy
Push the button (release).
10
6
2-3. SUB PANEL (1) ASSY
6
sub panel (1) assy
1
PTT 2.6x6
4
claw
2
PTT 2.6x6
5
claw
3
PTT 2.6x6
2-4. CD MECHANISM BLOCK
5
CD mechanism block
2
PTT 2.6x6
8
bracket (M/D)
7
PTT 2.6x6
3
PTT 2.6x6
6
PTT 2.6x
1
PTT 2.6x6
4
CNP700
11
8
8
2-5. MAIN BOARD
5
ground point screw
(PTT 2.6x6)
6
MAIN board
1
PTT 2.6x8
4
ground point screws
(PTT 2.6x6)
2
PTT 2.6x8
3
PTT 2.6x
2-6. HEAT SINK
4
heat sink
3
PTT 2.6x
1
2
PTT 2.6x8
PTT 2.6x12
12
2-7. CHASSIS (T) SUB ASSY
1
Unsolder the
lead wires.
gray
white
black
4
P 2x3
2
P 2x3
3
P 2x3
5
chassis (T) sub assy
2-8. LEVER ASSY
6
lever (R) assy
3
tension spring (LR)
7
lever (L) assy
5
guide (disc)
1
PS 2x4
2
DISC IN SW board
4
claws
13
2-9. SERVO BOARD
4
5
PS 2x4
1
3
P 2x3
loading motor assy
CN3
6
PS 2x4
2
CN2
7
SERVO board
2-10. ROLLER ASSY
• When installing, take note of the positions
arm (roller) and washers. (Fig. 1)
4
PS 2x3
5
LOAD SW board
washer
arm
washer
3
2
Fig. 1
roller assy
arm (roller)
washers
arm
14
1
tension spring (RA)
2-11. CHASSIS (OP) (O/S) ASSY
8
compression spring (FL)
1
tension spring (KF1)
7
9
compression spring (FL)
2
tension spring (KR1)
5
Fit lever (D) in the
direction of the arrow.
chassis (OP) (O/S) assy
6
Turn loading ring in the
direction of the arrow.
4
damper (T)
2-12. OPTICAL PICK-UP BLOCK
1
P 2x3
2
sled motor assy
3
damper (T)
3
optical pick-up block
15
SECTION 3
ELECTRICAL ADJUSTMENTS
TUNER SECTION 0 dB = 1 µV
Cautions during repair
When the tuner unit is defective, replace it by a new one
because its internal block is difficult to repair.
TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and MW Auto Scan/Stop Level adjustments can
be performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Set the “OFF” mode.
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 indicates all lights, the test mode is set.
<Release the Test Mode>
1. Push the OFF button.
Note on Adjustment
The adjustments of tuner section, should be performed according
to the following sequence.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. FM RDS S-Meter Adjustment
4. MW Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting :
D-BASS switch : OFF
SOURCE button : FM
FM RF signal
generator
antenna
µ
F
terminal
0.01
Carrier frequency : 98.00 MHz
Output level : 22 dB (12.6 µV)
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%)
Procedure :
1. Set to the test mode.
2. Push the SOURCE button and set to FM.
Display
SHUF
3. Push the preset 3 button.
Display
SHUF
set
4. 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.
Display
SHUF
Adjustment Location : See page 18.
16
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