Sony HCD-TB20 Service Manual

HCD-TB20

SERVICE MANUAL

Ver 1.1 2002. 10

This set is the tuner, deck, CD and amplifier
section in CHC-TB20.

Model Name Using Similar Mechanism NEW

CD

SECTION

TAPE DECK

SECTION

CD Mechanism Type CDM63E

Base Unit Type BU-30BD60C

Optical Pick-up Type A-MAX.3

Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type CMAL1Z222A

AEP Model

UK Model

E Model

SPECIFICATIONS

Amplifier section

European models

DIN power output (Rated):45 + 45 watts

Continuous RMS power output (Reference):

Music power output (Reference):

Other models

Measured at AC 120/220/240 V, 50/60 Hz:
DIN power output (Rated):40 + 40 watts

Continuous RMS power output (Reference):

Inputs
MD (VIDEO) IN (phono jacks):

Outputs
PHONES (stereo minijack):

SPEAKER: accepts impedance of 6 to

(6 ohms at 1 kHz, DIN)

60 + 60 watts
(6 ohms at 1 kHz, 10%
THD)

120 + 120 watts
(6 ohms at 1 kHz, 10%
THD)

(6 ohms at 1 kHz, DIN)

50 + 50 watts
(6 ohms at 1 kHz, 10%
THD)

voltage 450 mV (250
mV), impedance 47
kilohms

accepts headphones of
8 ohms or more.

16 ohms.

CD player section

System Compact disc and digital

Laser Semiconductor laser

Frequency response 2 Hz – 20 kHz (±0.5 dB)
CD DIGITAL OUT
(Square optical connector jack, rear panel)
Wavelength 660 nm

Tape deck section

Recording system 4-track 2-channel stereo
Frequency response 50 – 13,000 Hz (±3 dB),

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range 87.5 – 108.0 MHz

Antenna FM lead antenna
Antenna terminals 75 ohms unbalanced
Intermediate frequency 10.7 MHz

audio system

(λ=795 nm)
Emission duration:
continuous

using Sony TYPE I
cassettes

(50 kHz step)

— Continued on next page —

9-873-613-02

2002J1600-1

© 2002.10

COMPACT Hi-Fi COMPONENT SYSTEM

Sony Corporation

Home Audio Company

Published by Sony Engineering Corporation

HCD-TB20

AM tuner section

Tuning range
European models: 531 – 1,602 kHz

Pan-American models: 531 – 1,710 kHz

Other models: 531 – 1,602 kHz

Antenna AM loop antenna

Intermediate frequency 450 kHz

General

Power requirements
European models: 230 V AC, 50/60 Hz
Mexican model: 120 V AC, 60 Hz
Korean model: 220 V AC, 60 Hz
Other models: 120 V, 220 V, 230 –

Power consumption
European models: 120 watts

Other models: 100 watts

Dimensions (w/h/d) incl. projecting parts and controls

Mass Approx. 7.7 kg

(with the interval set at
9 kHz)

(with the interval set at
9 kHz)
530 – 1,710 kHz
(with the interval set at
10 kHz)

(with the interval set at
9 kHz)
530 – 1,710 kHz
(with the interval set at
10 kHz)

External antenna terminals

240 V AC, 50/60 Hz
Adjustable with voltage
selector

0.5 watts (at the Power
Saving Mode)

Approx. 215 × 285 ×
386 mm

MODEL IDENTIFICATION
– Back Panel –

Model

Mexican model

AEP, UK models

E model

Korea model

Power Voltage
Indicator

Power Voltage

Incdication

AC: 120 V 60 Hz

AC: 230 V 50/60 Hz

AC: 120, 220,

230 – 240 V 50/60 Hz

AC: 220 V 60 Hz

Design and specifications are subject to change
without notice.

2

TABLE OF CONTENTS

1. SERVICING NOTES ······················································· 4

2. GENERAL ·········································································· 6

3. DISASSEMBLY ································································ 8

3-1. Side Panel ····································································· 9
3-2. Top Panel ······································································ 9
3-3. Cassette Mechanism ··················································· 10
3-4. Front Panel ·································································· 10
3-5. PANEL Board ····························································· 11
3-6. DISPLAY Board ························································· 12
3-7. VOL Board ································································· 13
3-8. Back Panel ·································································· 13
3-9. MAIN Board ······························································· 14
3-10. AMP Board, Power Transformer ································14
3-11. CD Mechanism Deck (CDM63E) ······························ 15
3-12. CD Base Unit (BU-30 (60) Assy) ·······························16
3-13. DRIVER Board ···························································17
3-14. Fitting Base (Stabilizer) Assy, Tray Assy ··················· 17
3-15. TRAY SENSOR Board··············································· 18
3-16. Slider (Loading), Gear (Slider) ··································· 18
3-17. Stocker Assy ······························································· 19
3-18. DISC SENSOR Board ················································ 19
3-19. IN OUT SW Board ····················································· 20
3-20. Motor Assy (M721), MOTOR Bard ··························· 21

4. TEST MODE···································································· 22

5. MECHANICAL ADJUSTMENTS ····························· 23

6. ELECTRICAL ADJUSTMENTS ······························· 23

HCD-TB20

7. DIAGRAMS······································································ 27

7-1. Circuit Boards Location ·············································· 27
7-2. Block Diagrams ·························································· 29
7-3. Schematic Diagram BD Section ································ 32
7-4. Printed Wiring Board BD Section ····························· 33
7-5. Schematic Diagram DRIVER Section ·······················34
7-6. Printed Wiring Board DRIVER Section ····················35
7-7. Schematic Diagram MAIN Section (1/3) ·················· 36
7-8. Schematic Diagram MAIN Section (2/3) ·················· 37
7-9. Schematic Diagram MAIN Section (3/3) ·················· 38
7-10. Printed Wiring Board MAIN Section ························ 39
7-11. Schematic Diagram DECK Section ··························· 40
7-12. Printed Wiring Board DECK Section ························ 41
7-13. Schematic Diagram AMP Section ····························· 42
7-14. Printed Wiring Board AMP Section ·························· 43
7-15. Schematic Diagram PANEL Section ························· 44
7-16. Printed Wiring Board PANEL Section ······················ 45
7-17. Schematic Diagram TRANS Section ························· 46
7-18. Printed Wiring Board TRANS Section ······················ 47
7-19. Schematic Diagram POWER Section ························48
7-20. Printed Wiring Board POWER Section ·····················49
7-21. IC Pin Function Description ······································· 50
7-22. IC Block Diagrams ····················································· 52

8. EXPLODED VIEWS ······················································ 50

8-1. Side Panel, Back Panel Section ·································· 54
8-2. Front Panel Section ·····················································55
8-3. Chassis Section ··························································· 56
8-4. CD Mechanism Deck Section -1 ································ 57
8-5. CD Mechanism Deck Section -2 ································ 58
8-6. Base Unit Section (BU-30) ········································· 59

9. ELECTRICAL PARTS LIST······································· 60

3

HCD-TB20

SECTION 1

SERVICING NOTES

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 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.

Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.

This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.

This caution
label is
located inside
the unit.

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.

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.

Flexible Circuit Board Repairing

•Keep the temperature of soldering iron around 270˚C
during repairing.

• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering
or unsoldering.

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.

4

Service position of the CD mechanism deck

HCD-TB20

BD board

MAIN board

Jig cord : J-2501-208-A

Service position of the TAPE cassette mechanism deck

TC Deck section

Jig cord : J-2501-082-A

MAIN board

5

HCD-TB20

SECTION 2

GENERAL

This section is extracted
from instruction manual.

A – G

CD disc tray qk (8)
CD SYNC wj (19)
CD NX wl (9)
DBFB ws (21)
DIMMER 2 (24)
DISC 1 – 3 ql (10)
DISC 1 – 3 Z ql (8)
DISPLAY 3 (24)
Display window 5
EDIT wg (20)
ENTER/YES qd (8, 10, 12, 13,

14, 21, 22, 23)
EQ EDIT qj (22)
FUNCTION qg (9, 18)
GROOVE wa (21)

BUTTON DESCRIPTIONS

?/1 1
+/M L 7

x wh
l –/m 6

M – Z

MD (VIDEO) 9 (27)
MUSIC MENU wd (22)
PHONES jack w;
PLAY MODE/TUNING MODE

qf (9, 13, 15)
REC PAUSE/START wk (19)
Remote sensor q;
REPEAT/FM MODE qh (9, 15)
SURROUND wf (21)
Tape deck lid 4 (18)
TAPE nN qs (18, 19)
TUNER/BAND e; (13, 15)

TUNER MEMORY/DIRECTION

qa (14, 19)

VOL 8

A – G

CHECK 8 (11)
CLEAR qs (11)
CLOCK/TIMER SELECT 2

(21, 24)

CLOCK/TIMER SET 3

(8, 20, 23)
DBFB wh (21)
DIMMER wd (24)
DISC SKIP 9 (9, 11)
DISPLAY qk (24)
ENTER/YES qa (8, 10, 12, 13,

14, 21, 22, 23)
FUNCTION qg (9, 18)
GROOVE qh (21)

BUTTON DESCRIPTIONS

@/1 4
N q;
x q;
X q;
M qd
> qf
. ql
m w;

1234

M – Z

MENU/NO wa (13)
MUSIC MENU 6 (22)
NAME EDIT/CHARACTER ws

(11, 16)
REPEAT 7 (9)
SCROLL wg (12, 25)
SLEEP 1 (23)
SURROUND 5 (21)
TUNER/BAND wf (13, 15)
VOL +/– qj

wh

wg

wf
wd

ws
wa

w;

ql
qk

qj

5
6
7

8
9
0
qa
qs

qd

qf
qg

qh

6

HCD-TB20

Setting the clock

1 Turn on the system.
2 Press CLOCK/TIMER SET on the

remote.

3 Press . or > on the remote to set

the hour.

4 Press ENTER/YES.

The minute indication flashes.

5 Press . or > on the remote to set

the minute.

6 Press ENTER/YES.

The clock starts working.

If you make a mistake

Press m or M on the remote repeatedly
until the incorrect item flashes, then set it
again.

To adjust the clock

1

Press CLOCK/TIMER SET on the remote.

2

Press . or > on the remote to select
“CLOCK SET?”, then press ENTER/YES.

3

Do the same procedures as step 3 to 6
above.

Note

You cannot set the clock in the Power Saving Mode.

Loading a CD

1 Press DISC 1 – 3 Z.

The disc tray opens.

2 Place a CD with the label side up on the

disc tray.

When you play
a CD single (8
cm CD), place
it on the inner
circle of the
tray.

To load other CDs, press a different Z and
place the CD in the disc tray.

3 Press the same Z again to close the

disc tray.

7

HCD-TB20

SECTION 3

DISASSEMBLY

• The equipment can be removed using the following procedure.

SET

SIDE PANEL

(Page 9)

TOP PANEL

(Page 9)

CASSETTE MECHANISM

(Page 10)

• The dotted square with arrow ( ) prompts you to move to the next

job when all of the works within the dotted square ( )are completed.

FRONT PANEL

(Page 10)

PANEL BOARD

(Page 11)

DISPLAY BOARD

(Page 12)

VOL BOARD

(Page 13)

FITTING BASE (STABILIZER) ASSY,

TRAY ASSY

BACK PANEL

(Page 13)

MAIN BOARD

(Page 14)

CD MECHANISM

DICK (CDM63E)

(Page 15)

CD BASE UNIT

BU-30 (60)ASSY

(Page 16)

(Page 17)

AMP BOARD,

POWER TRANSFORMER

(Page 14)

DRIVER BOARD

(Page 17)

TRAY SENSOR BOARD

SLIDER(LOADING), GEAR (SLIDER)

STOCKER ASSY

(Page 19)

DISC SENSOR BOARD

(Page 19)

Note : Follow the disassembly procedure in the numerical order given.

(Page 18)

(Page 18)

IN OUT SW BOARD

(Page 20)

MOTOR ASSY (M721), MOTOR BOARD

(Page 21)

8

HCD-TB20

)

3-1. Side Panel

7

two

(

9

side panel (L)
(Remove in the direction
of the arrow)

8

four screws

(

CASE 3 TP2)

screws

+BVTP 3 × 8

)

1

screw

3

Heat sink, cover

+BVTT 3 × 8

(

2

(

)

two screws

+BVTP 3 × 8

4

two

screws

+BVTP 3 × 8

(

)

3-2. Top Panel

2

s

crew

+BVTT 3 × 8

(

Note: Attach it so that it

pressed down the
MAIN board.

3

s

crew

+BVTP 2.6 × 8

(

)

)

6

side panel (R)
(Remove in the direction
of the arrow)

6

top panel
(Remove in the direction
of the arrow)

5

4

connector
(CN322)

1

s

crew

(

+BVTP 2.6 × 8

5

four screws

CASE 3 TP2)

(

flat cable (9 core)
(CN321)

)

9

HCD-TB20

k

3-3. Cassette Mechanism

5

(

6

shield tc

(Cassette mechanism)

3

(

screw

+BVTP 2.6 × 5

screw

+BVTP 2.6 × 8

)

qa

)

7

2

screw

(

+BVTP 2.6 × 8

flat cable (9 core)

cassette mechanism dec

)

3-4. Front Panel

1

two screws

(

+BVTP 2.6 × 8

5

0

TC board

front panel

)

4

two screws

(

1

connector
(CN805)

9

8

three s

(

+BVTT 2.6 × 8

+BVTP 2.6 × 5

connector

crews

)

)

10

4

three

+BVTP 3 × 8

(

screws

2

connector
(CN402)

3

flat cable (17 core)
(CN401)

)

3-5. PANEL Board

0

two claws

front panel assy

9

three claws

qd

connector
(CN720)

qs

PANEL board
(Remove in the direction
of the arrow)

7

four

(

+BVTP 2.6 × 8

HCD-TB20

screws

)

5

CD

Lid

6

s

pring (CD)

qa

two claws

4

two

screws

(

+PTPWH 2.6 × 5

8

ten

screws

+BVTP 2.6 × 8

(

3

ground

1

two

screws

(

)

2

FRONT INPUT board

+BVTP 2.6 × 8

)

)

11

HCD-TB20

3-6. DISPLAY Board

3

sub

panel

1

two claws

8

liquid crystal,display panel

5

Remove ten solderings

4

two

screws

+BVTP 2.6 × 8

(

7

DISPLAY board

6

two

screws

(

+BVTP 2.6 × 8

)

)

2

two claws

12

3-7. VOL Board

d

Note: daring reassembling
when flange.

flange

spring

3

flange

4

spring

5

sub

shuttle

panel

6

VOL boar

HCD-TB20

3-8. Back Panel

6

connector

(CN942)

7

connector

(CN941)

9

VOL SEL board

(VOL SEL board is only in E model.)

1

knob (vol)

5

connector

(CN943)

2

nut

0

back panel

8

two screws

(

+BVTP 3 × 8

)

3

two screws

(

+BVTP 3 × 8

2

fourteen screws

(

+BVTP 3 × 8

)

)

1

flat cable
(15 core:AEP, UK model)
(11 core:except AEP, UK model)

(CN323)

4

tuner unit

13

HCD-TB20

3-9. MAIN Board

MAIN board

4

two connectors
(CN101, CN102)

3

connector
(CN501)

5

flat cable (21 core)
(CN301)

2

3-10. AMP Board, Power Transformer

3

(+BVTT 4

4

power

transformer

2

connector
(CN902)

four screws

×

8)

1

connector
(CN901)

5

(

connector
(CN701)

three screws

+BVTP 3 × 8

6

MAIN board

1

two screws

+BVTP 3 × 8

(

6

AMP board

)

7

two screws

+BVTP 3 × 8

(

)

8

cord bushing

)

14

9

SUB POWER board

HCD-TB20

3-11. CD Mechanism Deck (CDM63E)

5

CD mechanism deck

(CDM63E)

2

two screws

(

+BVTP 3 × 8)

4

four screws

(

+BVTP 3 × 8

)

3

chassis assy

1

three screws

(

+BVTP 3 × 8

)

Note: When installing the CD mechanism, the four bosses

must be aligned with the specified positions.

15

HCD-TB20

)

3-12. CD Base Unit (BU-30 (60) Assy)

1

flat type wire (21 core)

qa

Remove two solderings

2

two screws (+BVTP 2.6

×

8)

qs

0

tape

rivet

9

Remove two solderings

qf

BD board

qd

flat type wire (16 core)

6

two screws (+BVTP 2.6

×

8

3

two stoppers

4

two coil springs

(insulators)

5

two insulators

7

two insulators

8

BU-30 (60) ASSY

16

3-13. DRIVER Board

5

screw (BTTP M2.6)

7

DRIVER board

1

connector (CN705)

4

connector (CN703)

3

connector (CN704)

2

connector (CN702)

6

screw (BTTP M2.6)

HCD-TB20

3-14. Fitting Base (Stabilizer) Assy, Tray Assy

2

two screws (BTTP M2.6)

tray assy

8

4

7

fitting base (STABILIZER) assy

3

1

two screws (+BTTP M2.6)

6

three bosses

5

three bosses

17

HCD-TB20

3-15. TRAY SENSOR Board

1

Rotate the cam,
and lift up the stocker
at the full.

Cam

5

TRAY SENSOR board

4

two screws (+BTTP M2.6)

stocker

6

holder (sensor)

2

two screws (+BTTP M2.6)

3

3-16. Slider (Loading), Gear (Slider)

3

two screws (+BTTP M2.6)

6

slider (loading)

4

bracket (retainer)

8

two gears (slider)

2

bracket (retainer)

1

two screws (+BTTP M2.6)

18

5

floating screw

7

two floating screw

3-17. Stocker Assy

4

2

screw (+BTTP M2.6)

HCD-TB20

stocker assy

A

3

slide the slider (BU.L),
slider (BU.R) in the direction of

A

arrow

at the full.

3-18. DISC SENSOR Board

2

CD base unit assy

4

DISC SENSOR board

A

1

screw (+BTTP M2.6)

1

3

two screws (+BTTP M2.6)

19

HCD-TB20

3-19. IN OUT SW Board

2

two screws (+BTTP M2.6)

3

IN OUT SW board

1

connector (CN704)

20

3-20. Motor Assy (M721), MOTOR Bard

)

1

belt

2

HCD-TB20

connector (CN702

MOTOR board bottom view

3

Remove two solders.

6

4

two screws (+BTTP M2.6)

5

MOTOR board

7

motor assy (M721)

21

HCD-TB20

SECTION 4

TEST MODE

[CD Ship Mode]

•This mode moves the optical pick-up to the position durable to
vibration. Use this mode when returning the set to the customer
after repair.

Procedure:

1. Press ?/1 button to turn the set on.

2. Select the function “CD”.

3. Press CD 1 button and FUNCTION button simultaneously.

4. After the “STANDBY” display blinks six times, a message

“LOCK” is displayed on the liquid crystal display, and the CD
ship mode is set.

[GC Test Mode]

•This mode is used to check the software version, LCD, LED
and keyboard.

Procedure:

1. Press ?/1 button to turn the set on.

2. Press three buttons x , ENTER , and CD 2 simultaneously.

3. LEDs and segments of liquid crystal display are all turned on.

4. When you want to enter the software version display mode,

press CD 1 . The model number and destination are displayed.

5. Each time CD 1 is pressed, the display changes starting from

MC version, GC version, CD version, CDD version, CDMA
version, CDMB version, BDA version, BDB version, ST version,
TA version, TM version, TC version and MD version in this
order. By pressing CD3 the date of the software version is
displayed.

6. Press CD 2 button, and the key check mode is activated.

7. In the key check mode, the liquid crystal display displays “K 0

J 0 V 0”. Each time a button is pressed, “K 0” value increases.
However, once a button is pressed, it is no longer taken into
account.
“V 0” value increases like 1, 2, 3 ... if rotating VOL knob in
“+” direction, or it decreases like 0, 9, 8 ... if rotating in
“–” direction.

8. To exit from this mode, press three buttons in the same manner

as step 2, or disconnect the power cord.

[MC Test Mode]

•This mode is used to check operations of the respective sections
of Amplifier, Tuner, CD and Tape.

Procedure:

1. Press the ?/1 button to turn on the set.

2. Press the three buttons of x , ENTER and CD 3

simultaneously.

3. “MD” is displayed.

4. Every pressing of EQ EDIT changes the displays in the order

“GEQ MIN”t“GEQ FLAT”t“GEQ MAX”

of

11. During the recording by tuning m/M knob, the Tape

(Deck) is selected and tape is rewound. Tape stops at around
the record-starting position and playback of the recorded portion
of the tape is started.

12. Press ?/1 button to turn the set off. The cold reset is enforced

at the same time.

[CD Service Mode]

•This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the optical pick-up.

Procedure:

1. Press ?/1 button to turn the set on.

2. Select the function “CD”.

3. Press three buttons x , FUNCTIO , and CD 2 simultaneously.

4. The CD service mode is selected.

5. With the CD in stop status, turn the m/M knob up to move

the optical pick-up to outside track, or turn the m/M knob
counter-up to inside track.

6. To exit from this mode, perform as follows:

1) Move the optical pick-up to the most inside track.

2) Press ?/1 button to turn the set off.

Note: • Always move the optical pick-up to most inside track when exit-

ing from this mode. Otherwise, a disc will not be unloaded.

• Do not run the sled motor excessively, otherwise the gear can be
chipped.

[CD Ship (Memory Clear) Mode]

• Set the CD ship mode and set the default setup when shipped
from the factory at the next AC power on.

Procedure:

1. Press ?/1 button to turn the set on.

2. Select the function “CD ”.

3. Press three buttons x , FUNCTION and CD 1 simultaneously.

4. After the “STANDBY” display blinks six times, a message

“LOCK” is displayed on the liquid crystal display, and the CD
ship mode is set.

[CD Repeat 5 Times Limit Release Mode]

•5 times limit of repeating CD is released.

Procedure:

1. Press ?/1 button to turn the set on.

2. Press three buttons x , FUNCTION and CD 1Z .

3. The massage “LIMIT OFF” is displayed. 5 times limit of

repeating CD is released.

4. Cold reset is performed at power off.

5. When the VOL control knob is turned clockwise even slightly,
the sound volume increases to its maximum and a message
“VOL MAX” appears for two seconds, then the display returns
to the original display.

6. When the VOL control knob is turned counter-clockwise even
slightly, the sound volume decreases to its minimum and a
message “VOL MIN” appears for two seconds, then the display
returns to the original display.

7. Press the FUNCTION button to the TUNER.

8. By pressing the TUNING MODE button, select the preset
tuning.

9. The default-preset channel is selected. (It means that the
memory is cleared.)

10. When a tape is inserted in Deck and recording is started, the
input source function selects MD automatically.

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