Sony HCD-DX8 User manual

SERVICE MANUAL E Model
Australian Model
HCD-DX8
Ver 1.2 2001.11
9-929-221-13 Sony Corporation
2001K0500-1 Home Audio Company
C2001.11 Published by Sony Engineering Corporation
HCD-DX8isthetuner,tapeplayer,CDplayer
and amplifier section in MHC-DX8.
SPECIFICATIONS
— Continued on next page —
Amplifier section
The following measured at AC 120, 220, 240V
50/60 Hz
IN power output (rated) 160 + 160 watts
(6 ohms at 1 kHz, IN)
Continuous RMS power output (reference)
200 + 200 watts
(6 ohms at 1 kHz,
10% TH )
Inputs
M /VI EO (AU IO) IN: voltage 450 mV/250 mV,
(phono jacks) impedance 47 kilohms
MIC: sensitivity 1 mV,
(phone jack) impedance 10 kilohms
Outputs
PHONES: accepts headphones of 8
(stereo mini jack) ohms or more
FRONT SPEAKER: accepts impedance of 6 to
16 ohms
SATELLITE SPEAKER: accepts impedance of 6 to
16 ohms
CD player section
System Compact disc and digital
audio system
Laser Semiconductor laser
(λ=780nm)
Emission duration:
continuous
Laser output Max. 44.6
µ W*
*This output is the value
measured at a distance of
200 mm from the
objective lens surface on
the Optical Pick-up Block
with 7 mm aperture.
Frequency response 2 Hz – 20 kHz (±0.5 dB)
Wavelength 780 – 790 nm
Signal-to-noise ratio More than 90 dB
ynamic range More than 90 dB
C OPTICAL IGITAL OUT
(Square optical connector jack, rear panel)
Wavelength 660 nm
Output Level –18 dBm
This stereo system is equipped with the olby B-
type noise reduction system*.
* Manufactured under license from olby
Laboratories Licensing Corporation.
OLBY and the double- symbol ; are
trademarks of olby Laboratories Licensing
Corporation.
COMPACT DISC DECK RECEIVER
Model Name Using Similar Mechanism HCD-BX7
CD Mechanism Type CDM58-K2BD38
Base Unit Type BU-K2BD38
Optical Pick-up Type KSM-213DAP/Z-NP
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type TCM-230AWR11
CD
SECTION
TAPE DECK
SECTION

2
Tape player section
Recording system 4-track 2-channel stereo
Frequency response 40 – 13,000 Hz (±3 dB),
( OLBY NR OFF) using Sony TYPE I
cassette
40 – 14,000 Hz (±3 dB),
using Sony TYPE II
cassette
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 ohm unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range
Middle Eastern models: 531 – 1,602 kHz
(with the interval set at 9
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
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz
General
Power requirements
Australian models: 230 - 240 V AC, 50/60 Hz
Mexican models: 120 V AC, 60 Hz
Other models: 120 V, 220 V or 230 - 240
V AC, 50/60 Hz
Adjustable with voltage
selector
Power consumption 250 watts
imensions (w/h/d) Approx. 280 x 360 x 425
mm
Mass : Approx. 9.5 kg
esign and specifications are subject to change
without notice.
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.

3
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
otherthanthosespecifiedherein 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.
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.
MODEL IDENTIFICATION
— BACK PANEL —
TABLE OF CONTENTS
1. SERVICE NOTE ······························································· 4
2. GENERAL ·········································································· 5
3. DISASSEMBLY ································································ 7
4. TEST MODE···································································· 12
5. MECHANICAL ADJUSTMENTS ····························· 16
6. ELECTRICAL ADJUSTMENTS ······························· 16
7. DIAGRAMS
7-1. Circuit Boards Location ··················································· 21
7-2. Block Diagrams ································································ 22
7-3. Printed Wiring Board – BD Section – ····························· 24
7-4. Schematic Diagram – BD Section –································ 25
7-5. Printed Wiring Board – MAIN Section – ························ 26
7-6. Schematic Diagram – MAIN (1/3) Section – ·················· 27
7-7. Schematic Diagram – MAIN (2/3) Section – ·················· 28
7-8. Schematic Diagram – MAIN (3/3) Section – ·················· 29
7-9. Printed Wiring Board – POWER AMP Section – ··········· 30
7-10. Schematic Diagram – POWER AMP Section – ·············· 31
7-11. Printed Wiring Boards – PANEL Section –····················· 32
7-12. Schematic Diagram – PANEL Section –························· 33
7-13. Printed Wiring Boards – LEAF SW Section – ················ 34
7-14. Schematic Diagram – LEAF SW Section – ···················· 35
7-15. Printed Wiring Boards – DRIVER Section – ··················36
7-16. Schematic Diagram – DRIVER Section – ······················ 37
7-17. Printed Wiring Board – TRANS Section –······················ 38
7-18. Schematic Diagram – TRANS Section – ························ 39
7-19. IC Pin Function Description············································· 40
7-20. IC Block Diagrams ··························································· 42
8. EXPLODED VIEWS ······················································ 46
9. ELECTRICAL PARTS LIST ······································· 52
PART No.
• Abbreviation
AR : Argentine
AUS : Australian
E2 : 120 V AC Area in E model
E3 : 240 V AC Area in E model
MODEL
E2, E3, EA, MY, SP, AR models
MX, AUS models
PART No.
4-225-040-3s
4-225-040-4s
EA : Saudi Arabia
MY : Malaysia
MX : Mexican
SP : Singapore
This appliance is classified
as a CLASS 1 LASER
product. The CLASS 1
LASER PRO UCT
MARKING is located on
the rear exterior.

4
SECTION 1
SERVICE NOTE
Screw hole
Attach the panel board with
six screws (
+BVTP 2.6 × 8 )
after the board is removed once.
Do not tighten the screws excessively.
1 Cut the nine melted-connection points with cutting pliers.
Note for installing the panel board
2 Panel board
Hot melt
: melted-connection point

5
SECTION 2
GENERAL
1DISC SKIP button
2DISC 1 button and indicator
3DISC 2 button and indicator
4DISC 3 button and indicator
5ZOPEN/CLOSE button
6CD disc tray
7Fluorescent indicator tube
8EDIT, TUNER, MEMORY button
9PLAY MODE, STEREO/MONO button
q; REPEAT, DOLBY NR button
qa DIRECTION button
qs SURROUND button
qd VOLUME knob
qf Shuttle knob
qg xbutton
qh gG button
qj PHONES jack
qk Tape deck-B
ql TAPE A/B button
w; CD button
wa Function indicator
ws TUNER/BAND button
wd MD (VIDEO) button
wf ?/1 button and indicator
wg DISPLAY button
wh SPECTRUM button
wj EQ EDIT button
wk GROOVE button
wl ECHO LEVEL knob (Saudi Arabia model)
e; MIC LEVEL knob
ea MIC2 jack (Saudi Arabia model)
es MIC1 jack (Saudi Arabia model)
MIC jack (except SaudiArabia model)
ed g, G, f, Fbutton and indicator
ef V-GROOVE button and indicator
eg Tape deck-A
eh – .button
ej Xbutton
ek >+ button
el KARAOKE PON button
r; CD SYNC HI-DUB
ra REC PAUSE/START button and indicator
rs ENTER button
LOCATION OF CONTROLS
• Front view
1
6
el
2 3 4 5
7
8
9
0
qa
qs
qd
qf
qgqh
qj
qk
ra
r; rs
ek
ejeh
wd
ws
waw;
ql
wf
wg
wh
wj
wk
wl
e;
ea
es
ed
ef
eg

6
This section is extracted from
instruction manual.
1 Press CLOCK/TIMER SET.
The hour indication flashes.
2 Press . or > repeatedly to set
the hour.
Step3: Settingthe
time
You ust set the ti e before using the ti er
functions.
jJ
lL
hH S s
HS s
1
3,5
2,4
3 Press ENTER.
The inute indication flashes.
4 Press . or > repeatedly to set
the inute.
5 Press ENTER.
The clock starts working.
Tip
If you’ve ade a istake, start over fro step 1.
To change the time
The previous explanation shows you how to set the
ti e while the power is off. To change the ti e
while the power is on, do the following:
1Press CLOCK/TIMER SET.
2Press . or > repeatedly to select
SET CLOCK.
3Press ENTER.
4Perfor steps 2 through 5 above.
Note
The clock settings are canceled when you disconnect
the power cord or if a power failure occurs.

7
1three screws (case)
4three screws (case)
2two screws
(BVTP3 × 10
)
7two screws
(BVTP3 × 10)
8claw
9case (top)
5two screws
(BVTP3 × 10)
3 side panel R
6 side panel L
SECTION 3
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
CASE (TOP)
LOADING PANEL ASS’Y
pulley (S)
front panel side
- bottom view -
CD mechanism deck (CDM58)
1 Turn the pulley (S) to the direction of arrow.
2 Pull out the table.
3 loading panel ass'y

8
FRONT PANEL ASS’Y
TAPE MECHANISM DECK
1 wire (flat type)
(17 core) (CN304)
5 connector
(CN601)
2 connector (CN1)
8 connector
(19 core) (CN201)
9 connector (CN202)
q; CD mechanism deck
7
4 screw (BVTP3 × 10)
4 screw
(BVTP3 × 10)
6 front panel ass'y
3two screws
(BVTP3 × 12)
2 connector (CN2)
1 screw
(BVTP2.6
×8 )
5 five screws
(BVTP2.6 × 8)
6 tape mechanism deck
(TCM-230AWR11)
3 screw
(BVTP2.6 ×8 )
2 bracket (heart cam R)
4 bracket (heart cam L)
BASE UNIT (Page 11)
DRIVER/MOTOR/
SENSOR BOARDS
(Page 11)
LEAF SW/
HEAD (A)/
HEAD (B) BOARDS
(Page 10)

9
PANEL BOARD
POWER TRANSFORMER (T971), TRANS BOARD
6two screws
(BVTP2.6
×8 )
8 CD switch board
q; three claws
9 Cut the nine melted-connection points
with a cutting plier.
: melted-connection point
q; five claws
qa PANEL board
7t hree claws
2two screws
(BVTP2.6
×8 )
3 bracket (FR)
4 FR knob
5 knob (MIC)
5 knob (MIC)
1 vol knob
Note: When attching the panel board,
refer to "Service Note" on page 4.
EA
2two screws
(BVTP3
×10 )
7two screws
(BVTP4
×8 )
7two screws
(BVTP4
×8 )
q; TRANS board
8power transformer
(T971)
3six
screws
(BVTP3
×10
)
1 connector (CN891)
5 connector (CN975)
9Remove the sixteen solderings.
6
connector (CN977)
4 back panel

10
MAIN/POWER AMP BOARDS
LEAF SW/HEAD (A)/HEAD (B) BOARDS
1two screws
(BVTP3 ×8 )
2 connector (CN502)
2 connector (CN503)
4two screws
(BVTP3 ×16 )
7two screws
(BVTP3 ×8
)
8h eat sink
5three screws
(BVTP3 ×8 )
6POWER AMP board
3MAIN board
6ground point s crew
(PTT2
× 4)
2five claws
5LEAF
SW board
3
4
Remove the four solderings.
1 Remove the two solderings.
7 HEAD (A) board
8ground point s crew
(PTT2
× 4)
9 HEAD (B) board
1 Remove the two solderings.