Sony hcd-tb20 User manual

HCD-TB20
AEP Model
UK Model
E Model
SERVICE MANUAL
COMPACT HiFi COMPONENT SYSTEM
— Continued on next page —
SPECIFICATIONS
Ver 1.0 2002. 03
This set is the tuner, deck, CD and amplifier
section in CHC-TB20.
Model Name Using Similar Mechanism NEW
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
CD
SECTION
TAPE DECK
SECTION
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
9-873-613-01
2002C1600-1
© 2002.03
Amplifier section
European models
DIN power output (Rated):45 + 45 watts
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (Reference):
60 + 60 watts
(6 ohms at 1 kHz, 10%
THD)
Music power output (Reference):
120 + 120 watts
(6 ohms at 1 kHz, 10%
THD)
Other models
Measured at AC 120/220/240 V, 50/60 Hz:
DIN power output (Rated):40 + 40 watts
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (Reference):
50 + 50 watts
(6 ohms at 1 kHz, 10%
THD)
Inputs
MD (VIDEO) IN (phono jacks):
voltage 450 mV (250
mV), impedance 47
kilohms
Outputs
PHONES (stereo minijack):
accepts headphones of
8 ohms or more.
SPEAKER: accepts impedance of 6 to
16 ohms.
CD player section
System Compact disc and digital
audio system
Laser Semiconductor laser
(λ=795 nm)
Emission duration:
continuous
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),
using Sony TYPE I
cassettes
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 – 108.0 MHz
(50 kHz step)
Antenna FM lead antenna
Antenna terminals 75 ohms unbalanced
Intermediate frequency 10.7 MHz

2
HCD-TB20
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 –
240 V AC, 50/60 Hz
Adjustable with voltage
selector
Power consumption
European models: 120 watts
0.5 watts (at the Power
Saving Mode)
Other models: 100 watts
Dimensions (w/h/d) incl. projecting parts and controls
Approx. 215 ×285 ×
386 mm
Mass Approx. 7.7 kg
Design and specifications are subject to change
without notice.
AM tuner section
Tuning range
European models: 531 – 1,602 kHz
(with the interval set at
9 kHz)
Pan-American models: 531 – 1,710 kHz
(with the interval set at
9 kHz)
530 – 1,710 kHz
(with the interval set at
10 kHz)
Other models: 531 – 1,602 kHz
(with the interval set at
9 kHz)
530 – 1,710 kHz
(with the interval set at
10 kHz)
Antenna AM loop antenna
External antenna terminals
Intermediate frequency 450 kHz
MODEL IDENTIFICATION
– Back Panel –
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
Model
Mexican model
AEP, UK models
E model
Korea model
Power Voltage
Indicator

3
HCD-TB20
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
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

4
HCD-TB20
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINEWITH
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.
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.
CAUTION
Use of controls or adjustments or performance of procedures
otherthan those specified hereinmay result inhazardous 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.
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 pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
SECTION 1
SERVICING NOTES
This caution
label is
located inside
the unit.

5
HCD-TB20
BD board
Jig cord : J-2501-208-A
MAIN board
TC Deck section
MAIN board
Jig cord : J-2501-082-A
Service position of the CD mechanism deck
Service position of theTAPE cassette mechanism deck

6
HCD-TB20 SECTION 2
GENERAL This section is extracted
from instruction manual.
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)
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 Zql (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)
TUNER MEMORY/DIRECTION
qa (14, 19)
VOL 8
BUTTON DESCRIPTIONS
?/1 1
+/M L 7
xwh
l–/m 6
6
7
8
9
5
qf
qg
qh
0
qd
qa
qs
ql
qk
qj
w;
1234
wa
ws
wd
wh
wg
wf
BUTTON DESCRIPTIONS
@/1 4
Nq;
xq;
Xq;
Mqd
>qf
.ql
mw;
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)
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

7
HCD-TB20
Setting the clock
1Turn on the system.
2Press CLOCK/TIMER SET on the
remote.
3Press .or >on the remote to set
the hour.
4Press ENTER/YES.
The minute indication flashes.
5Press .or >on the remote to set
the minute.
6Press ENTER/YES.
The clock starts working.
If you make a mistake
Press mor Mon the remote repeatedly
until the incorrect item flashes, then set it
again.
To adjust the clock
1Press CLOCK/TIMER SET on the remote.
2Press .or >on the remote to select
“CLOCK SET?”, then press ENTER/YES.
3Do the same procedures as step 3 to 6
above.
Note
You cannot set the clock in the Power Saving Mode.
When you play
a CD single (8
cm CD), place
it on the inner
circle of the
tray.
Loading a CD
1Press DISC 1 – 3 Z.
The disc tray opens.
2Place a CD with the label side up on the
disc tray.
To load other CDs, press a different Zand
place the CD in the disc tray.
3Press the same Zagain to close the
disc tray.

8
HCD-TB20 SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
•The equipment can be removed using the following procedure.
IN OUT SW BOARD
(Page 20)
MOTOR ASSY (M721), MOTOR BOARD
(Page 21)
SET
SIDE PANEL
(Page 9)
CASSETTE MECHANISM
(Page 10)
TOP PANEL
(Page 9)
FRONT PANEL
• The dotted square with arrow ( ) prompts you to move to the next
job when all of the works within the dotted square ( )are completed.
(Page 10)
BACK PANEL
(Page 13)
CD MECHANISM
DICK (CDM63E)
(Page 15)
AMP BOARD,
POWER TRANSFORMER
(Page 14)
FITTING BASE (STABILIZER) ASSY,
TRAY ASSY
(Page 17)
CD BASE UNIT
BU-30 (60)ASSY
(Page 16)
MAIN BOARD
(Page 14)
PANEL BOARD
(Page 11)
DISPLAY BOARD
(Page 12)
VOL BOARD
(Page 13)
DRIVER BOARD
(Page 17)
TRAY SENSOR BOARD
(Page 18)
STOCKER ASSY
(Page 19)
SLIDER(LOADING), GEAR (SLIDER)
(Page 18)
DISC SENSOR BOARD
(Page 19)

9
HCD-TB20
3-1. Side Panel
1 screw
(
+BVTT 3 × 8 )
5 four screws
(
CASE 3 TP2)
8 four screws
(
CASE 3 TP2)
2 two screws
(
+BVTP 3 × 8 )
3 Heat sink, cover
4 two screws
(
+BVTP 3 × 8
)
7 two screws
(
+BVTP 3 × 8 )
6 side panel (R)
(Remove in the direction
of the arrow)
9 side panel (L)
(Remove in the direction
of the arrow)
3-2. Top Panel
Note: Attach it so that it
pressed down the
MAIN board.
6 top panel
(Remove in the direction
of the arrow)
3 s crew
(
+BVTP 2.6 × 8 )
2 s crew
(
+BVTT 3 × 8 )
1 s crew
(
+BVTP 2.6 × 8 )
5 flat cable (9 core)
(CN321)
4 connector
(CN322)

10
HCD-TB20
3-4. Front Panel
3-3. Cassette Mechanism
7 cassette mechanism dec
k
qa flat cable (9 core)
2 screw
( +BVTP 2.6 × 8 )
3 screw
(
+BVTP 2.6 × 8 )
5 screw
(
+BVTP 2.6 × 5 )
1 two screws
( +BVTP 2.6 × 8 )
4 two screws
( +BVTP 2.6 × 5 )
9 connector
8 three s crews
( +BVTT 2.6 × 8 )
6 shield tc
(Cassette mechanism)
0 TC board
4 three screws
(
+BVTP 3 × 8 )
5 front panel
1 connector
(CN805)
2 connector
(CN402)
3 flat cable (17 core)
(CN401)

11
HCD-TB20
3-5. PANEL Board
1 two screws
(
+BVTP 2.6 × 8 )
8 ten screws
(
+BVTP 2.6 × 8 )
7 four screws
(
+BVTP 2.6 × 8 )
2 FRONT INPUT board
3 ground
front panel assy
4 two screws
(
+PTPWH 2.6 × 5 )
6 s pring (CD)
5 CD Lid
9 three claws
qa two claws
0 two claws
qs PANEL board
(Remove in the direction
of the arrow)
qd connector
(CN720)

12
HCD-TB20
3-6. DISPLAY Board
1 two claws
sub
panel
2 two claws
4 two screws
(
+BVTP 2.6 × 8 )
6 two screws
(
+BVTP 2.6 × 8 )
5 Remove ten solderings
8 liquid crystal,display panel
7 DISPLAY board
3

13
HCD-TB20
3-7. VOL Board
3-8. Back Panel
sub panel
1 knob (vol)
2 nut
3 flange
4 spring
spring
flange
5 shuttle
6 VOL boar
d
Note: daring reassembling
when flange.
3 two screws
(
+BVTP 3 × 8 )
4 tuner unit
2 fourteen screws
(
+BVTP 3 × 8 )
1 flat cable
(15 core:AEP, UK model)
(11 core:except AEP, UK model)
0 back panel
5 connector
(CN943)
8 two screws
(
+BVTP 3 × 8 )
7 connector
(CN941)
9 VOL SEL board
(VOL SEL board is only in E model.)
6 connector
(CN942)
(CN323)

14
HCD-TB20
3-9. MAIN Board
MAIN board
5 flat cable (21 core)
(CN301)
6 MAIN board
1 two screws
(
+BVTP 3 × 8 )
4 two connectors
(CN101, CN102)
2 connector
(CN701)
3 connector
(CN501)
3-10. AMP Board, PowerTransformer
1 connector
(CN901)
2 connector
(CN902)
3 four screws
(+BVTT 4
× 8)
5 three screws
(
+BVTP 3 × 8 )
6 AMP board
4 power
transformer
7 two screws
(
+BVTP 3 × 8 )
8 cord bushing
9 SUB POWER board

15
HCD-TB20
3-11. CD Mechanism Deck (CDM63E)
3 chassis assy
5 CD mechanism deck
(CDM63E)
2 two screws
(
+BVTP 3 × 8)
1 three screws
(
+BVTP 3 × 8 )
4 four screws
(
+BVTP 3 × 8 )
Note: When installing the CD mechanism, the four bosses
must be aligned with the specified positions.

16
HCD-TB20
3-12. CD Base Unit (BU-30 (60) Assy)
7 two insulators
8 BU-30 (60) ASSY
6 two screws (+BVTP 2.6 × 8
)
2 two screws (+BVTP 2.6 × 8)
qf BD board
0 tape
qs rivet
5 two insulators
4 two coil springs
(insulators)
3 two stoppers
1 flat type wire (21 core)
qd flat type wire (16 core)
9 Remove two solderings
qa Remove two solderings

17
HCD-TB20
3-13. DRIVER Board
5 screw (BTTP M2.6)
6 screw (BTTP M2.6)
4 connector (CN703)
3 connector (CN704)
2 connector (CN702)
1 connector (CN705)
7 DRIVER board
3-14. Fitting Base (Stabilizer) Assy,Tray Assy
6 three bosses
5 three bosses
2 two screws (BTTP M2.6)
1 two screws (+BTTP M2.6)
3
4
8
tray assy
7 fitting base (STABILIZER) assy

18
HCD-TB20
3-15. TRAY SENSOR Board
2 two screws (+BTTP M2.6)
4 two screws (+BTTP M2.6)
5 TRAY SENSOR board
1 Rotate the cam,
and lift up the stocker
at the full.
stocker
6 holder (sensor)
3
Cam
3-16. Slider (Loading), Gear (Slider)
6 slider (loading)
2 bracket (retainer)
1 two screws (+BTTP M2.6)
4 bracket (retainer)
3 two screws (+BTTP M2.6)
8 two gears (slider)
7 two floating screw
5 floating screw

19
HCD-TB20
3-17. Stocker Assy
3 slide the slider (BU.L),
slider (BU.R) in the direction of
arrow
A at the full.
A
A
4
stocker assy
1 screw (+BTTP M2.6)
2 screw (+BTTP M2.6)
3-18. DISC SENSOR Board
4 DISC SENSOR board
2 CD base unit assy
3 two screws (+BTTP M2.6)
1

20
HCD-TB20
3-19. IN OUT SW Board
2 two screws (+BTTP M2.6)
3 IN OUT SW board
1 connector (CN704)