Sony HCD-S20 Service Manual
HCD-S20
SERVICE MANUAL
Ver. 1.0 2013.04
• HCD-S20 is compact disc receiver in CMT-S20.
SPECIFICATIONS
Amplier section
Power output (rated): 4 watts + 4 watts
(8 ohms at 1 kHz, 1% THD)
Continuous RMS power output (reference):
5 watts + 5 watts (8 ohms at 1 kHz, 10% THD)
Input
AUDIO IN (stereo mini jack): Sensitivity 1 V,
impedance 50 kilohms
Outputs
SPEAKERS: Accepts impedance of 8 ohms
CD player section
System: Compact disc and digital audio system
Laser Diode Properties
Emission Duration: Continuous
Laser Output*: Less than 44.6μW
* This output is the value measurement at a distance of
200mm from the objective lens surface on the Optical
Pick-up Block with 7mm aperture.
Frequency response: 20 Hz 20 kHz
Signal-to-noise ratio: More than 90 dB
Dynamic range: More than 90 dB
Tuner section
FM stereo, FM superheterodyne tuner
Antenna: FM lead antenna
Tuning range: 87.5 MHz 108.0 MHz (50 kHz
step)
USB section
(USB) port: Type A, maximum current 500 mA
E Model
Model Name Using Similar Mechanism NEW
Mechanism Type TDL-5
Supported audio formats
Supported bit rate:
MP3 (MPEG 1 Audio Layer-3): 32 kbps
320 kbps, VBR
WMA: 32 kbps 192 kbps, VBR
Sampling frequencies:
MP3 (MPEG 1 Audio Layer-3): 32/44.1/48 kHz
WMA: 44.1 kHz
General
Except Korean model:
Power requirements: AC 120 V 240 V, 50/60 Hz
Korean model:
Power requirements: AC 220 V 240 V, 50/60 Hz
Power consumption: 18 watts
Dimensions (W/H/D, including largest
protrusions) (excl. speakers):
Approx. 170 mm × 133 mm × 240 mm
Mass (excl. speakers): Approx. 1.3 kg
Quantity of the main unit: 1 piece
Design and specifications are subject to change
without notice.
Standby power consumption: 0.5 W
Halogena ted flame retardants are not used in
the certain printed wiring boards.
9-893-739-01
2013D33-1
COMPACT DISC RECEIVER
Sony Corporation
HCD-S20
TABLE OF CONTENTS
1. SERVICING NOTES ............................................. 3
2. DISASSEMBLY
2-1. Disassembly Flow ........................................................... 7
2-2. Top Cover Assy S20........................................................ 7
2-3. Power Cord (AC1), Rear Panel ....................................... 8
2-4. CD Door (S20) ................................................................ 8
2-5. Loader (TDL-5) & OPU Assy (CDM1) .......................... 9
2-6. Front Panel Block ........................................................... 9
2-7. VFD Board ...................................................................... 10
2-8. USB Board ...................................................................... 10
2-9. MAIN Board ................................................................... 11
2-10. POWER Board ................................................................ 11
3. TEST MODE ............................................................ 12
4. ELECTRICAL CHECK ......................................... 13
5. TROUBLESHOOTING .......................................... 14
6. DIAGRAMS
6-1. Block Diagram ................................................................ 16
6-2. Board Component Diagram (1/3) ................................... 17
6-3. Board Component Diagram (2/3) ................................... 18
6-4. Board Component Diagram (3/3) ................................... 19
6-5. Printed Wiring Board - MAIN Board - ........................... 21
6-6. Schematic Diagram - MAIN Board (1/6) - ..................... 22
6-7. Schematic Diagram - MAIN Board (2/6) - ..................... 23
6-8. Schematic Diagram - MAIN Board (3/6) - ..................... 24
6-9. Schematic Diagram - MAIN Board (4/6) - ..................... 25
6-10. Schematic Diagram - MAIN Board (5/6) - ..................... 26
6-11. Schematic Diagram - MAIN Board (6/6) - ..................... 27
6-12. Printed Wiring Board - USB Board - .............................. 28
6-13. Schematic Diagram - USB Board - ................................. 29
6-14. Printed Wiring Board - VFD Board - .............................. 30
6-15. Schematic Diagram - VFD Board - ................................ 31
6-16. Printed Wiring Board - KEY Board -.............................. 32
6-17. Schematic Diagram - KEY Board - ................................ 33
6-18. Schematic Diagram - POWER Board - .......................... 34
6-19. Printed Wiring Board - POWER Board - ........................ 35
7. EXPLODED VIEWS
7-1. Top Cover Section........................................................... 36
7-2. Chassis Section ............................................................... 37
7-3. Front Panel Section ......................................................... 38
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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specifi ed herein may result in hazardous radia-
tion exposure.
SAFETY-RELATED COMPONENT WARNING!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON 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.
2
SECTION 1
SERVICING NOTES
HCD-S20
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by
the charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The fl exible 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 refl ective 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.
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the leadfree 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 fl ow)
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.
RELEASING THE DISC TRAY LOCK
The disc tray lock function for the antitheft of sample disc in the
shop is equipped.
Releasing Procedure:
1. Press the [
2. Press two buttons of the [x] on the remote commander and
[Z] on the main unit simultaneously for fi ve seconds.
3. The message “UNLOCKED” is displayed on the fluorescent
indicator tube and the disc tray is unlocked.
Note: When “LOCKED” is displayed, the disc tray lock is not released by
turning power on/off with the [
CAPACITOR ELECTRICAL DISCHARGE PROCESSING
When checking the board, the electrical discharge is necessary for
the electric shock prevention.
Connect the resistor to both ends of respective capacitors.
• POWER Board
CE501, CE502, CE534
] button to turn the power on.
?/1
] button.
?/1
– POWER Board (Conductor Side) –
800 :/2 W
(for CE501)
800 :/2 W
(for CE502)
800 :/2 W
(for CE534)
ABOUT PART REPAIR OF EACH BOARD
The part that mounted on each board cannot exchange. When the
mounted part is damaged, exchange with the complete mounted
board or part including complete mounted board.
Printed wiring board and schematic diagram that have been described on this service manual are for reference.
TEST DISCS
Use following TEST DISC (for CD) when this unit confi rms the
operation and checks it.
Part No. Description
3-702-101-01 DISC (YEDS-18), TEST
4-225-203-01 DISC (PATD-012), TEST
3
HCD-S20
MODEL IDENTIFICATION
Distinguish by model number label stuck on the rear side of a main unit.
MODEL NUMBER LABEL
110 – 240V AC area in E model (E32) Singapore model (SP1)
05/2013
Saudi Arabia model (EA3) Argentina model (AR2)
Mexican model (MX2) Korean model (KR2)
4
HCD-S20
7
COMPONENT REPAIR GUIDE
1. No Display When You Turn The Main Unit ON
When you plug power cord and turn the main unit on, VFD won’t
display.
Procedure:
1. Check POWER board have +12V DC output.
2. Check MAIN board output voltage +5V and −24V from U2 on
the MAIN board.
If output +5V or −24V is not normal, check the working status
of U2 on the MAIN board.
3. Check output voltage 3.3 from U3 on the MAIN board.
If output +3.3V is not normal, check the working status of U3
on the MAIN board.
4. Check waveform of Y3 on the MAIN board , the waveform of
Y3 on the MAIN board sine wave.
If waveform of Y3 on the MAIN board is not normal, check Y3
on the MAIN board.
2. When You Plug Power Cord and Turn The Main Unit
ON, The Main Unit Won’t Have Sound
Procedure:
1. Check U5 on the MAIN board and its peripheral circuit.
2. Check if output voltage +3.3V from pin 32, pin 54, pin 70, pin
72, pin 78 and pin 83 of U5 on the MAIN board.
If output voltage +3.3V is not normal, check +3.3V power cir-
cuit of MAIN board.
3. Check if output voltage +1.2V from pin 10, pin 77 and pin 86
of U5 on the MAIN board.
If output voltage +1.2V is not normal, check +1.2V power cir-
cuit of MAIN board.
4. Check if oscillating frequency 27 MHz of Y10 crystal on the
MAIN board is normal.
If oscillating frequency 27 MHz is not normal, check if Y10 on
the MAIN board and its peripheral circuit is in failure.
5. Check if the status of U17 and U25 on the MAIN board work
well, the normal status of pin 27 of U25 on the MAIN board is
sine wave with frequency 11.0592 MHz. And pin 23 of U25 on
the MAIN board is high in normal status.
If pin 27 of U25 on the MAIN board wave is not normal, check
if U17 and U25 on the MAIN board and its peripheral circuit is
in failure.
3. When You Plug Power Cord and Turn The Main Unit
ON, The Main Unit Won’t Read Disc Normal
Procedure:
1. Check U5 on the MAIN board signal and its peripheral circuit,
and check output voltage +3.3V from pin 8 of U6 on the MAIN
board is normal.
If output voltage +3.3V is not normal, check +3.3V power cir-
cuit of MAIN board.
2. Check every signal connected between U5 and U6 on the
MAIN board, especially including DATA, CLK and CS signal.
If DATA, CLK and CS signal is not normal output, check if U6
on the MAIN board is in failure.
3. Check if output voltage +5V from pin 8, pin 19 and pin 21 U7
on the MAIN board is normal.
If output voltage +5V is not normal, check +5V power circuit
of MAIN board.
4. Check every signal connected between U5 and U7 on the
MAIN board, especially including F+, F−, T+, T−, SP+, SP−,
SL+ and SL− signal to drive MD.
If F+, F−, T+, T−, SP+, SP−, SL+ and SL− signal is not nor-
mally output, check if U7 on the MAIN board is in failure.
Checking Location:
– MAIN Board (Component Side) –
U7
U25
U1
U6
Y10
U5
+12V power from
POWER board
U2 U3 Y3
5
HCD-S20
HOW TO EJECT THE DISC WHEN POWER SWITCH TURN OFF
1 Refer to “SECTION 2. DISASSEMBLY” (page 7), remove the top cover assy S20 and the rear panel block from the unit.
top side
bottom side
– Rear view –
2 Turn the traverse gear in
the direction of an arrow.
3 Pull out the disc tray.
– Rear view –
SERVICE POSITION
loader (TDL-5) & OPU assy
(CDM1)
MAIN board
USB board
KEY board
POWER board
VFD board
6
DISASSEMBLY
• This set can be disassembled in the order shown below.
2-1. DISASSEMBLY FLOW
SET
2-2. TOP COVER ASSY S20
(Page 7)
2-3. POWER CORD (AC1), REAR PANEL
(Page 8)
2-4. CD DOOR (S20)
(Page 8)
2-5. LOADER (TDL-5) & OPU ASSY (CDM1)
(Page 9)
HCD-S20
SECTION 2
2-6. FRONT PANEL BLOCK
(Page 9)
2-7. VFD BOARD
(Page 10)
Note: Follow the disassembly procedure in the numerical order given.
2-9. MAIN BOARD
(Page 11)
2-8. USB BOARD
(Page 10)
2-2. TOP COVER ASSY S20
5 top cover assy S20
3 four claws
3 three claws
2-10. POWER BOARD
(Page 11)
1 three screws (2)
3 two claws
3 four claws
2 Remove the top cover assy S20
in the direction of an arrow.
4 connector
(XP1)
7
HCD-S20
2-3. POWER CORD (AC1), REAR PANEL
3 Remove the rear panel block
in the direction of an arrow.
6 rear panel
2 claw
2 claw
3RZHUFRUGVHWWLQJ
top side
2 claw
1 screw (3)
2 claw
–5HDUYLHZ–
2-4. CD DOOR (S20)
top side
4 power cord connector
(CN503)
5 power cord
(AC1)
–5HDUSDQHOEORFNOHIWYLHZ–
When installing the power cord (AC1),
Note:
Check the direction of connector.
2 Pull out the disc tray.
bottom side
3 four claws
4 CD door (S20)
bottom side
– Rear view –
1 Turn the traverse gear in
the direction of an arrow.
– Rear view –
8
2-5. LOADER (TDL-5) & OPU ASSY (CDM1)
HCD-S20
Before disconnecting the flexible flat cable of
Note 1:
Note 4: The wire is soldered to the
terminal of the switch.
Be careful so that not cut
or bend the terminal.
– Bottom view –
3 Remove the loader (TDL-5) & OPU
assy in the direction of an arrow.
the loader (TDL-5) & OPU assy (CDM1)
2 screws (3)
7 loader (TDL-5) & OPU assy
(CDM1)
, solder the short-land.
2 screws (3)
Solder the short-land.
1
Note 2: When assembling the loader (TDL-5) &
OPU assy (CDM1), remove the solder of
short-land after connecting all flexible flat
cable and connector.
4 flexible flat cable
(XP2)
5 connector
(XP3)
connector (XP4)
6
Note 3:
When disconnecting, do it while holding the
connector part.
.
Since the wire is very thin, it is easy to cut.
2-6. FRONT PANEL BLOCK
Wire setting
front panel block
chassis
When installing the front panel
Note 1:
block, be careful not to bite the
wire at the chassis.
Wire from USB board is upper.
VFD board
front panel block
5
– Rear view –
4 six claws
1 connector
(XP6)
2 connector
(XP9)
3 connector
(XP12)
– Rear right view –
Wire from VFD board is lower.
Note 2:
When connecting, be careful not to mistake.
These connectors have the same number of pins.
9
HCD-S20
2-7. VFD BOARD
1 three claws
WireVeWWiQJ
–)rRQWSDQeOEORFNreDrYieZ–
2-8. USB BOARD
VFD board
2 VFD board
–)rRQWSDQeOEORFNreDrYieZ–
VOL knob
1
–)rRQWSDQeOEORFNreDrYieZ–
WireVeWWiQJ
USB board
4 six claws
5 USB board
2 screw (1)
3 earth plate
2 screw (1)
2 two screws
(BVTP2.6)
10
–)rRQWSDQeOEORFNreDrYieZ–
2-9. MAIN BOARD
HCD-S20
:ire VeWWiQJ
These connectors have the
Note:
same number of pins.
When connecting, be careful
not to mistake.
Wire from USB board is upper.
Wire from VFD board is lower.
– Rear view –
6 MAIN board
4 connector
(XP12)
3 connector
(XP9)
1 connector
(CON2)
A
5 screw (3)
A
2 connector
(XP6)
2-10. POWER BOARD
– Rear view –
2 screw (3)
3 POWER board
2 screw (3)
– Rear view –
1 connector
(CON2)
11
HCD-S20
SECTION 3
TEST MODE
SOFTWARE VERSION
It can confi rm the software version.
Procedure:
1. Press the [?/1] button to turn the power on.
2. Press the [Z] button to open the disc tray.
3. Press the button on the remote commander as following order.
[CLEAR] → [B] → [RETURN]
(Displayed values in the following fi gure are example)
Screen display
M20F3P15
MCU IC
Software version
Software Difference
Destination Display Specifi cations
110 – 240V AC area in
E model
Saudi Arabia model
Mexican model
Singapore model
Argentina model
Korean model
Releasing method:
Press the [
to turn the power off.
] button to close the disc tray or press the [?/1] button
Z
Software
difference
F3
F4
F4
F4
F3
F6
MPEG IC
Software version
FM 50 kHz step, no RDS,
Tuner output level 2.2 dB,
12 hours display
FM 50 kHz step, no RDS,
Tuner output level 4.2 dB,
12 hours display
FM 50 kHz step, no RDS,
Tuner output level 4.2 dB,
12 hours display
FM 50 kHz step, no RDS,
Tuner output level 4.2 dB,
12 hours display
FM 50 kHz step, no RDS,
Tuner output level 2.2 dB,
12 hours display
FM 50 kHz step, no RDS,
Tuner output level 7.2 dB,
12 hours display
TRAY LOCK
It can be unable to take sample disc out of disc tray in the shop.
Procedure:
1. Press the [
2. Press the [Z] button to open the disc tray.
3. Set a disc on the disc tray.
4. Press the [Z] button to close the disc tray.
5. Press two buttons of the [x] on the remote commander and [Z]
on the main unit simultaneously for fi ve seconds.
6. The message “LOCKED” is displayed on the fluorescent indicator tube and the disc tray is locked.
(Even if pressing the [Z] button, the message “LOCKED” is
displayed on the fluorescent indicator tube and the disc tray is
locked)
Releasing method:
1. Press two buttons of the [x] on the remote commander and [Z]
on the main unit simultaneously for fi ve seconds.
2. The message “UNLOCKED” is displayed on the fluorescent
indicator tube and the disc tray is unlocked.
PANEL TEST
It can confi rm the fluorescent indicator tube.
Procedure:
1. Press the [?/1] button to turn the power on.
2. Press two buttons of the [x] on the remote commander and [x/
CANCEL] on the main unit simultaneously for fi ve seconds.
3. All segments on the fluorescent indicator tube light up.
Screen display
Releasing method:
Press two buttons of the [x] on the remote commander and [x/
CANCEL] on the main unit simultaneously for fi ve seconds or
press the [?/1] button to turn the power off.
] button to turn the power on.
?/1
FACTORY RESET
It can clears all data including preset data stored in the memory to
initial conditions. Execute this mode when returning the this unit
to the customer.
Procedure:
1. Press the [?/1] button to turn the power on.
2. Press two buttons of the [x] on the remote commander and
[EQ] on the main unit simultaneously for fi ve seconds.
3. The message “RESET OK is displayed on the fl uorescent indi-
cator tube, then returns to the normal mode.
12
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