Sony HCD-DR8AV User manual

HCD-DR8AV/W900AV
US Model
Canadian Model
HCD-W900AV
E Model
Australian Model
HCD-DR8AV
SERVICE MANUAL
COMPACT DISC DECK RECEIVER
Model Name Using Similar Mechanism HCD-DR4/DR5/DR6/DR440/
W300/W5000/XB500
CD Mechanism Type CDM37M-5BD32L
Base Unit Name BU-5BD32L
Optical Pick-up Name KSS-213D/Q-N
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type TCM-230AWR2/230PWR2
HCD-DR8AV/W900AV isthetuner,deck,CDand
amplifier section in LBT-DR8AV/W900AV.
— Continued on next page —
SPECIFICATIONS
CD
Section
Tape deck
Section
Ver 1.1 2003. 05
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
9-928-902-12
2003E16-1
© 2003.05
Amplifier section
LBT-W900AV
Front Speaker:
Continuous RMS power output (Reference)
100 + 100W
(8 Ωat 1 kHz, 10% THD)
Total harmonics distortion Less than 0.07%
(8 Ωat 1 kHz, 50W)
Center Speaker:
Continuous RMS power output (Reference)
45W
(8 Ωat 1 kHz, 10% THD)
Rear Speaker:
Continuous RMS power output (Reference)
40 + 40W
(8 Ωat 1 kHz, 10% THD)
LBT-DR8AV
Front Speaker:
The following measured at AC 120/220/240V, 50Hz
DIN power output (Rated) 130 + 130W
(6 Ωat 1 kHz, DIN)
Continuous RMS power output (Reference)
160 +160W
(6 Ωat 1 kHz, 10% THD)
Center Speaker:
DIN power output (Rated) 30W
(8 Ωat 1 kHz, DIN)
Continuous RMS power output (Reference)
40W
(8 Ωat 1 kHz, 10% THD)
Rear Speaker:
DIN power output (Rated) 30 + 30W
(8 Ωat 1 kHz, DIN)
Continuous RMS power output (Reference)
40 + 40W
(8 Ωat 1 kHz, 10%
THD)
Inputs
PHONO IN (phono jacks): sensitivity 3mV,
impedance 47k Ω
MIX MIC (phone jack): sensitivity 1mV,
impedance 10k Ω
VIDEO1 IN (phono jacks): sensitivity 250mV,
impedance 47k Ω
VIDEO2 IN (phono jacks): sensitivity 250mV,
impedance 47k Ω
MD IN (phono jacks): sensitivity 450mV,
impedance 47k Ω
(LBT-DR8AV/W900AV)
DVD IN (phono jacks): sensitivity 450mV,
impedance 47kΩ
Outputs
PHONES (stereo phone jack):accepts headphones of 8
Ωor more
VIDEO OUT (phono jack): voltage 250mV,
impedance 1k Ω
MD OUT (phono jacks): voltage 250mV, impedance
1k Ω
WOOFER OUT (phono jack):voltage 1V, impedance
1k Ω
FRONT SPEAKER:
(LBT-W900AV) accepts impedance of 8 to
16 Ω
(LBT-DR8AV) accepts impedance of 6 to
16 Ω
CENTER SPEAKER: accepts impedance of 8 to
16 Ω
REAR SPEAKER: accepts impedance of 8 to
16 Ω
Video section
Inputs
VIDEO1 IN (phono jacks): 1Vp-p, 75 Ω
VIDEO2 IN (phono jacks): 1Vp-p, 75 Ω
Output
VIDEO OUT (phono jack): 1Vp-p, 75 Ω
Photo: HCD-DR8AV

— 2 —
CD player section
System Compact disc and digital audio system
Laser Semiconductor laser
(λ=780nm) Emission
duration: continuous
Laser output Max. 44.6µW*
* 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.
Wavelength 780 – 790 nm
Frequency response 2Hz – 20kHz (±0.5dB)
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB
CD DIGITAL OUT
(square optical connector jack, rear panel)
Wave length: 660 nm
Output level: –18dBm
Tape player section
Recording system 4-track 2-channel stereo
Frequency response (DOLBY NR OFF)
40 – 13,000Hz (±3dB),
using a Sony TYPE I
cassette
40 – 14,000Hz (±3dB),
using a Sony TYPE II
cassette
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
(2 band model)
North American model: 87.5 – 108.0 MHz
(100 kHz step)
Other models: 87.5 – 108.0 MHz
(50 kHz step)
(3 band model)
FM: 87.5 – 108.0 MHz
(50 kHz step)
UKV: 65.0 – 74.0 MHz
(10kHz step) STEREO PLUS
Antenna FM wire antenna
Antenna terminals 75 Ωunbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range
North American model: 530 – 1,710 kHz
(with the tuning interval set at 10 kHz)
531 – 1,710 kHz
(with the tuning interval set at 9 kHz)
European model: 531 – 1,602 kHz
(with the tuning interval set at 9 kHz)
Middle Eastern model: 531 – 1,602 kHz
(with the tuning interval set at 9 kHz)
Other models: 531 – 1,602 kHz
(with the tuning interval set at 9 kHz)
530 – 1,710 kHz
(with the tuning interval set at 10 kHz)
Antenna AM loop antenna terminals
Intermediate frequency 450 kHz
General
Power requirements
NorthAmerican model: 120 VAC, 60 Hz
Mexican model: 120 V AC, 50/60 Hz
Australian model: 230 – 240 V AC, 50/60 Hz
Other models: 120 V, 220V, or 230 – 240 VAC, 50/60 Hz
Adjustable with voltage selector
Power consumption
(LBT-DR8AV) 260 W
(LBT-W900AV) 190 W
Dimensions (w/h/d) Approx. 356 ×423 ×446 mm
(141/8×163/4×175/8in) incl. projecting
parts and controls
Mass
(LBT-DR8AV) Approx. 15.0 kg (33 lb 2 oz.)
(LBT-W900AV) Approx. 13.5 kg (29 lb 13 oz.)
Supplied accessories AM loop antenna (1)
Remote RM-SR11AV (1)
R6 (size AA) batteries (2)
FM wire antenna (1)
Speaker cords (2)
Design and specifications are subject to change without notice.

— 3 —
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTSIDENTIFIED BYMARK !OR DOTTEDLINEWITH
MARK !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.
After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
Checkthe antenna terminals,metal trim, “metallized”knobs, screws,
and all other exposed metal parts forAC leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth ground
and from all exposed metal parts to any exposed metal part having
a return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operatedAC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2VAC range are suitable. (See
Fig. A)
SAFETY CHECK-OUT
(US model only)
To Exposed Metal
Parts on Set
0.15
µ F1.5 k
Ω
AC
Voltmeter
(0.75 V)
Earth Ground
Fig.A. Using an AC voltmeter to checkAC leakage.
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 specifiedherein mayresult 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.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTSIDENTIFÉS P AR UNEMARQUE !SUR LES
DIAGRAMMESSCHÉMATIQUESETLALISTE DESPIÈCESSONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACERCES COMPOSANTSQ UEPARDESPIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS P AR SONY.

— 4 —
PARTS No. MODEL
4-214-785-5πW900AV: US
4-214-785-6πW900AV: CND
4-214-790-0πDR8AV: E, AR
4-214-790-1πDR8AV: SP
4-214-790-2πDR8AV: MX
4-214-790-3πDR8AV: EA
4-214-790-4πDR8AV: AUS
MODEL IDENTIFICATION
— BACK PANEL —
• Abbreviation
CND : Canadian model
AUS : Australian model
EA : Saudi Arabia model
MX : Mexican model
SP : Singapore model
AR : Argentina model
Parts No.
NOTES ON HANDLINGTHE 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.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the “Scurve check” in“CD section adjustment” and check
that the S curve waveform is output four times.
SECTION 1
SERVICING NOTE
About CD-TEXT display
This unit is provided with a simple CD-TEXT display function.
TheCD-TEXTcontents of 20tracks are displayedon the fluorescent
display tube.
Since the function is simple, some special characters may not be
displayed, or may be displayed as other characters.

— 5 —
TABLE OF CONTENTS
7-15. Printed Wiring Board Power Section
(DR8AV model)································································ 61
7-16. Schematic Diagram Power (1/2) Section
(W900AV model) ····························································· 63
7-17. Schematic Diagram Power (2/2) Section
(W900AV model) ····························································· 65
7-18. Printed Wiring Board Power Section
(W900AV model) ····························································· 67
7-19. Schematic Diagram FL Section···································· 69
7-20. Printed Wiring Board FL Section ································· 71
7-21. Schematic Diagram Panel VR Section ························· 73
7-22. Printed Wiring Board Panel VR Section ······················ 75
7-23. Schematic Diagram TC Panel Section ························· 77
7-24. Printed Wiring Board TC Panel Section······················· 79
7-25. Schematic Diagram CD Panel Section ························· 81
7-26. Printed Wiring Board CD Panel Section ······················ 83
7-27. Schematic Diagram CD Motor Section ························ 85
7-28. Printed Wiring Board CD Motor Section ····················· 87
7-29. Schematic Diagram Jack Section ································· 89
7-30. Printed Wiring Board Jack Section ······························ 91
7-31. Schematic Diagram Trans Section
(W900AV model) ····························································· 93
7-32. Printed Wiring Board Trans Section
(W900AV model) ····························································· 95
7-33. Schematic Diagram Trans Section
(DR8AV model)································································ 97
7-34. Printed Wiring Board Trans Section
(DR8AV model)································································ 99
7-35. Schematic Diagram Leaf SW Section ························ 100
7-36. Printed Wiring Board Leaf SW Section ····················· 100
7-37. Schematic Diagram Surround Section ······················· 101
7-38. Printed Wiring Board Surround Section····················· 101
7-39. IC Block Diagrams ························································· 103
7-40. IC Pin Functions ····························································· 104
8. EXPLODED VIEWS
8-1. Case and Back Panel Section ········································· 107
8-2. Front Panel Section 1 ····················································· 108
8-3. Front Panel Section 2 ····················································· 109
8-4. Chassis Section ······························································· 110
8-5. TC Mechanism Section 1 (TCM230AWR2/230PWR2) 111
8-6. TC Mechanism Section 2 (TCM230AWR2/230PWR2) 112
8-7. CD Mechanism Section (CDM37M-5BD32L) ·············· 113
8-8. Base Unit Section (BU-5BD32L)··································· 114
9. ELECTRICAL PARTS LIST····································· 115
1. SERVICING NOTE ·························································· 4
2. GENERAL ·········································································· 6
3. DISASSEMBLY
3-1. Front Panel ········································································· 8
3-2. Main Board ········································································· 8
3-3. Sub Panel ············································································ 9
3-4. CD-L/CD-R Board and CD Lid Assembly························· 9
3-5. Tape Mechanism Deck and Cassette Lid·························· 10
3-6. CD Mechanism Deck ······················································· 10
3-7. Base Unit ·········································································· 10
3-8. Disc Table ········································································· 11
4. SERVICE MODE ···························································· 12
5. MECHANICAL ADJUSTMENTS ····························· 15
6. ELECTRICAL ADJUSTMENTS ······························· 15
7. DIAGRAMS
7-1. Circuit Boards Location ··················································· 19
7-2. Block Diagrams
BD Section ······································································· 21
Deck Section····································································· 23
Main (1/2) Section···························································· 25
Main (2/2) Section···························································· 27
Power Section (DR8AV model) ······································· 29
Power Section (W900AV model) ····································· 31
Display Section································································· 33
7-3. Printed Wiring Board BD Section ································ 37
7-4. Schematic Diagram BD WSection ······························· 39
7-5. Printed Wiring Board Main Section ····························· 41
7-6. Schematic Diagram Main (1/5) Section ······················· 43
7-7. Schematic Diagram Main (2/5) Section ······················· 45
7-8. Schematic Diagram Main (3/5) Section ······················· 47
7-9. Schematic Diagram Main (4/5) Section ······················· 49
7-10. Schematic Diagram Main (5/5) Section ······················· 51
7-11. Schematic Diagram Deck Section ································ 53
7-12. Printed Wiring Board Deck Section ····························· 55
7-13. Schematic Diagram Power (1/2) Section
(DR8AV model)································································ 57
7-14. Schematic Diagram Power (2/2) Section
(DR8AV model)································································ 59

— 6 —
SECTION 2
GENERAL
234
1
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Location of Parts and Controls
11/u (Power) button and indicator
2DEMO (STANDBY) button (DR8AV)
POWER SAVE/DEMO (STANDBY)
button (W900AV)
3DISPLAY button
4SPECTRUM ANALYZER button
5Display window
6GEQ control button
7SYNC BASS button
8SYNC EQ button
9Remote sensor
0TUNING MODE button
!¡ STEREO/MONO button
!™ ENTER/NEXT button and indicator
!£ TUNER MEMORY button
!¢ TUNER/BAND button
!∞ TUNING - button
!§ TUNING + button
!¶ FUNCTION button
!• VOLUME knob
!ª PHONES jack
@º MIC LEVEL knob
@¡ MIX MIC jack
@™ GROOVE button and indicator
@£ SUPER WOOFER button and indicator
@¢ MODE button
@∞ ª(B Deck) button and indicator
@§ ·(B Deck) button and indicator
@¶ p(B Deck) button
@• 0(B Deck) button
@ª )(B Deck) button
#º P(B Deck) button
#¡ rREC (B Deck) button
#™ HI-SPEED DUB button
#£ CD SYNCHRO button
#¢ PLAY MODE button
#∞ REPEAT button
#§ 0(CD) button
#¶ )(CD) button
#• ·P (CD) button and indicator
#ª p(CD) button
$º DISK SKIP button
$¡ =AMS +knob
$™ VIDEO2 INPUT jacks
$£ PRO LOGIC button and indicator
$¢ DVD 5.1 CH
$∞ EDIT button
$§ NON-STOP button and indicator
$¶ LOOP button
$• FLASH button
$ª DISC 5 button
%º DISC 4 button
%¡ DISC 3 button
%™ DISC 2 button
%£ DISC 1 button
%¢ DOLBY NR button
%∞ DIRECTION button
%§ )(A Deck) button
%¶ 0(A Deck) button
%• p(A Deck) button
%ª ·(A Deck) button
^º ª(A Deck) button
^¡ KARAOKE PON/MPX button
^™ DSP button and indicator
^£ EFFECT button and indicator
^¢ ENTER button and indicator
^∞ GEQ CONTROL button
^§ P. FILE MEMORY
^¶ Equalizer indicators
^• t/CLOCK SET button
^ª SLEEP button
&º REC button and indicator
&¡ DAILY button and indicator
• AMS is the abbreviation for Automatic
Music Sensor.
Front Panel

— 7 —
This section is extracted
from instruction manual.

— 8 —
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. FRONT PANEL
3-2. MAIN BOARD
1 Three flat type wires
(CN303,CN304,CN431)
2 Connector (CN702)
3 Connector (CN452)
4 Connector (CN802)
7 Front panel
5 Screw (BVTP 3x8
)
6 Four screw (BVTP 3x8)
4 Connector (CN412)
5 Flat type wire (CN411)
1 Flat type wire (CN1
)
3 Tuner unit
2 Two screws (BVTP 3x8)
7 Seven screws (BVTP 3x8)
!¡ Fan motor
(HCD-DR8AV)
!£ Power cord
!¢ Back panel
8 Five screws (BVTP 3x8)
6 Connector (CN903)
(HCD-DR8AV)
!§ Main board
!∞ Two screws (BVTP 3x8
)
0 Two screws (BVTP 3x8)
(HCD-DR8AV)
!™ Screw (BVTP 3x8)
(HCD-W900AV)
9 Four screws (BVTP 3x8)

— 9 —
3-3. SUB PANEL
3-4. CD-L/CD-R BOARD AND CD LID ASSEMBLY
3 Open the CD lid assembly
8 Sub panel block
4 Two screws (BTP 2.6x6)
1 Two screws (BVTP 2.6x8)
6 Two screws (BVTP 2.6x8)
7 Three screws (BVTP 2.6x8)
5 Screw (BVTP 3x8)
2 Front input board
9 Two screws (BVTP 2.6x8)
0 Bracket (CD-R2)
!£ CD lid assembly
1 Three screws (BVTP 2.6x8)
7 Three screws
(BVTP 2.6x8)
8 Two screws (BVTP 2.6x8)
9 Bracket (CD-R)
0 CD-R board
2 Three screws
(BVTP 2.6x8)
3 Bracket (CD-L)
4 CD-L board
!™ Torsion spring (CD-L)
Torsion spring (CD-L) Sub panel assembly
Sub panel assembly CD lid assembly
5 Knob (CD)
6 Nut
!¡ Torsion spring (CD-R)

— 10 —
3-5.TAPE MECHANISM DECK AND CASSETTE LID
3-6. CD MECHANISM DECK
5 Cassette lid (B) assembly
(Refer to upper figure)
7 Holder (B) assembly
(Refer to lower figure)
6 Holder (A) assembly
(Refer to lower figure)
4 Cassette lid (A) assembly
(Refer to upper figure)
Cassette lid assembly
Holder assembly
Claw
Claw
Claw
Claw
8 Torsion spring (TC-A)
9 Torsion spring (TC-B)
1 Three screws (BVTP 2.6x8)
2 Three screw
s
(BVTP 2.6x8
)
3 Tape mechanism
Portion B
Portion B
Portion A
Portion A
3-7. BASE UNIT
1 Five screws (BVTP3x8)
2 CD mechanism
deck
3 Base uni
t
1 Yoke fitting
2 Boss

— 11 —
3-8. DISCTABLE
Note:
When the disc table is installed, adjust the positions of
roller cam and mark ”as shown in the figure, then set to
the groove of disc table.
A
A
2 Screw (BVTP3X8)
1 Screw (BVTP3X8)
4 Stop screw
5 Disc table
3 Bracket (BU)

– 12 –
SECTION 4
SERVICE MODE
MC Cold Reset
• The cold reset clears all data including preset data stored in the RAM to initial conditions. Execute this mode when returning the set to the
customer.
Procedure:
1. Press three buttons t/CLOCK SET , ENTER , and 1/usimultaneously.
2. “COLD RESET” is displayed on the fluorescent display tube and reset is executed.
CD Delivery Mode
• This mode moves the pick-up to the position durable to vibration. Use this mode when returning the set to the customer after repair.
Procedure:
1. Press 1/ubutton to turn the set ON.
2. Press LOOP button and 1/ubutton simultaneously.
3. A message “LOCK” is displayed on the fluorescent indicator tube, and the CD delivery mode is set.
MC Hot Reset
• This mode resets the set with the preset data kept stored in the memory. The hot reset mode functions same as if the power cord is plugged
in and out.
Procedure:
1. Press three buttons t/CLOCK SET , ENTER , and DISC 1 simultaneously.
2. The fluorescent indicator tube becomes blank instantaneously, and the set is reset.
Sled Servo Mode
• This mode can run the CD sled motor freely. Use this mode, for instance, when cleaning the pick-up.
Procedure:
1. Press 1/ubutton to turn the set ON.
2. Press three buttons t/CLOCK SET , ENTER , and DISC 5 simultaneously.
3. The Sled Servo mode is selected, if “CD” is blanking on the fluorescent indicator tube.
4. With the CD in stop status, When the =AMS +knob is rotated in the clockwise direction, the pick-up moves outside. When
rotated counterclockwise, it moves inside.
5. To exit from this mode, perform as follows:
1) Move the pick-up to the most inside track.
2) Execute MC cold reset. (Press the three buttons t/CLOCK SET , ENTER , and 1/ubutton simultaneously.)
Note:
• Always move the pick-up to most inside track when exiting from this mode. Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can be chipped.
Change-over of AMTuner Step between 9kHz and 10kHz (DR8AV Only)
• A step of AM channels can be changed over between 9kHz and 10kHz.
Procedure:
1. Press 1/ubutton to turn the set ON.
2. Select the function “TUNER”, and press TUNER/BAND button to select the BAND “AM”.
3. Press 1/ubutton to turn the set OFF.
4. Press ENTER and 1/ubuttons simultaneously, and the display of fluorescent indicator tube changes to “AM 9k STEP” or “AM 10k
STEP”, and thus the channel step is changed over.
LED and Fluorescent IndicatorTube All Lit, Key Check Mode
Procedure:
1. Press three buttons t/CLOCK SET , ENTER , and DISC 2 simultaneously.
2. LEDs and fluorescent indicator tube are all turned on.
Press DISC 2 button, and the key check mode is activated.
3. In the key check mode, the fluorescent indicator tube displays “K @V0 J0”. Each time a button is pressed, “K”value increases. However,
once a button is pressed, it is no longer taken into account.
“J” Value increases like 1, 2, 3 ... if rotating =AMS +knob in “+” direction, or it decreases like 0, 9, 8 ... if rotating in “-”
direction.
“V” Value increases like 1, 2, 3 ... if rotating VOLUME knob in “+” direction, or it decreases like 0, 9, 8 ... if rotating in “-” direction.
4. To exit from this mode, press three buttons in the same manner as step 1, or disconnect the power cord.

– 13 –
AMSTest Mode
• This mode is used for checking theAMS operations of the tape deck.
JIG
7-819-039-12 Alignment tape, AMS-110A
Procedure:
1. Press the 1/ubutton to turn the set ON.
2. Set the tape (AMS-110A).
3. Press the three buttons t/CLOCK SET , ENTER , and DISC 3 button simultaneously.
4. “TEST MODE” is displayed on the fluorescent display tube.
5. Press the FUNCTION button and switch the function to the deck with the tape (AMS-110A).
6. Press the CD SYNCHRO button. “AMS CHECK” is displayed on the fluorescent display tube and the tape is rewound.
7. AMS starts in the normal direction. If the AMS count is 2 at shut down, proceed to step 8.
“NG” is displayed at other times, and the deck stops.
8. AMS starts in the opposite direction. If the AMS count is 2 at shut down again, “OK” is displayed.
“NG” is displayed at other times.
Aging Mode
During the aging mode, both the CD player and tape deck are executed together.
• If an error occurs:
Aging stops, and the error state is displayed on the fluorescent display tube.
• If no error occurs:
Aging is repeated.
Procedure:
1. Press the 1/ubutton to turn the set ON.
2. Load 10 minute tapes with unbent rec-proof tabs in decks A and B.
3. Set CDs on the DISC 1 and DISC 4 tables.
4. Set the CD mode REPEAT to OFF and PLAY MODE to ALL DISCS.
(Press the PLAY MODE and REPEAT buttons to set these modes.)
5. Press the FUNCTION button to switch the function to “CD”.
6. Press the three buttons t/CLOCK SET , ENTER , and DISC 4 button simultaneously.
7. Aging starts.
8. To end aging, press the 1/ubutton to turn the set OFF.
Aging Sequence:
Aging is performed in the following sequence.
• Tape Deck
1. The tape in deck A is rewound. “TAPE A AG-1” is displayed.
2. The FWD side of deck A is played for two minutes.
“TAPE A AG-2” is displayed.
3. The tape in deck A is fast forwarded. “TAPE A AG-3” is displayed. Fast forward is carried out for 20 seconds or to the tape end.
4. The RVS side of deck A is played for two minutes.
“TAPE A AG-4” is displayed.
5. The tape in deck A is rewound. “TAPE A AG-5” is displayed.
6. The FWD side of deck B is played for two minutes.
“TAPE B AG-2” is displayed.
7. The tape in deck B is fast forwarded. “TAPE B AG-3” is displayed. Fast forward is carried out for 20 seconds or to the tape end.
8. The RVS side of deck B is played for two minutes.
“TAPE B AG-4” is displayed.
9. The tape in deck A is rewound. “TAPE A AG-5” is displayed.
10. Repeated from step 2.
• CD
1. The tray rotates.
2. DISC 1 is chucked.
3. The TOC is read.
4. The first track is played for 2 seconds.
5. The last track is played for 2 seconds.
6. The tray rotates.
7. DISC 4 is chucked.
8. The TOC is read.
9. The first track is played for 2 seconds.
10. The last track is played for 2 seconds.
11. Repeated from step 1.

– 14 –
• Display when ended abnormally
When the tape deck is abnormal:
The state when ended abnormally is displayed.
The contents of display are the same as that during aging.
When the CD player is abnormal:
A message indicating that errors such as “CD MEC ERR” have occurred.
Check the error contents in the following error history display mode.
Error History Display Mode
Mode which enables the history of error occurring in the CD player to be checked.
Execute this mode after ending the aging mode.
Procedure:
1. Press the 1/ubutton to turn the set ON.
2. Press the three buttons t/CLOCK SET , ENTER , and CD SYNCHRO simultaneously.
3. A message such as “EMC@@EDC**” is displayed.
@@ : Number of mechanical errors (Up to three past errors)
** : Number of errors (NO DISC ERROR) which occurs after chucking (Up to three past errors)
4. When checking the history of mechanical errors, press the PLAY MODE button. When checking errors after chucking, press the
REPEAT button to switch the display.
5. Press the 1/ubutton to end and turn the set OFF.
6. To erase the error history, perform COLD reset.
(Press the three buttons t/CLOCK SET , ENTER , and DISC 1 simultaneously.
• Viewing the mechanical error history display
(Switch the history by pressing the PLAY MODE button.)
Display
E@@M#*****
@@ : Error number. 00 is the newest.
# : Operating state of table
0 : Currently in the INITIAL mode
7 : Currently rotating to the right
8 : Currently rotating to the left
A : Currently chucking down
B : Currently chucking up
* : Invalid
• Viewing the NO DISC ERROR history display
(Switch the history by pressing the REPEAT button.)
Display
E@@D##$$%*
@@ : Error number. 00 is the newest
## : Error contents
01: Focus error
02: GFS error
03: Setup error
$$ : Retries
00: NO DISC is determined without attempting chucking
retry 02: NO DISC is determined after chucking retry.
% : State when determined as NO DISC
1 : When stopped
2 : At setup
3 : At TOC READ
4 : When accessing
5 : When playing
6 : When pausing
7 : When manual searching (during play)
8 : When manual searching (during pausing)
* : Invalid

— 15 —
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads pinch rollers
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head
demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1 dB of peak.
test tape
P-4-A100
(10kHz, –10dB) MD OUT level meter
set +
–
L-CH
peak
R-CH
peak
screw
position
output
level within
1 dB
L-CH
peak R-CH peak
screw
position
within 1dB
Mode
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
Torque meter
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Meter reading
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
71 to 143 g • cm
(0.98 – 1.99 oz • inch)
100 g or more
(3.53 oz or more)
100 g or more
(3.53 oz or more)
SECTION 6
ELECTRICAL ADJUSTMENTS
SECTION 5
MECHANICAL ADJUSTMENTS
DECK SECTION 0 dB=0.775V
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjusted.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switchesandcontrols should beset as followsunless otherwise
specified.
Record/Playback Head Azimuth Adjustment
(Deck A, Deck B)
Note: Perform this adjustments for both decks.
Procedure:
1. Mode : Playback
Tape Signal Used for
P-4-A100
WS-48B
P-4-L300
10 kHz, –10 dB
3 kHz, 0 dB
315 Hz, 0 dB
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment

— 16 —
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location: Playback Head (DeckA)
Record/Playback/Erase Head (Deck B)
3. Mode: Playback Tape Speed Adjustment (Deck A)
Note: Set the test mode using the following method and begin tape
speed adjustment.
In the test mode, the speed will switch to double speed or
normal speed each time the HI-SPEED DUB button is pressed.
Procedure:
With the power turned ON, press the t/CLOCK SET button,
ENTER button, and DISC 3 button simultaneously.
(The “VOLUME” on the fluorescent display tube will blink while
in the test mode.)
To exit the test mode, press the 1/u button.
1. Insert the WS-48B into deck B.
2. Press the ·button of deck B.
3. Pressthe HI-SPEEDDUB buttonandplaythetapeatdoublespeed.
4. Adjust RV1001 of the LEAF SW board so that the reading of
the frequency counter becomes 6000 ± 180 Hz.
5. Pressthe HI-SPEEDDUB buttonandplaythetapeatnormalspeed.
6. Adjust RV1002 of the LEAF SW board so that the reading of
the frequency counter becomes 3000 ± 90 Hz.
Adjustment Location: LEAF SW board
SampleValue of Wow and flutter
W.RMS (JIS) less than 0.3%
(test tape: WS-48B)
Playback Level Adjustment (Deck A, Deck B)
Procedure:
Mode: Playback
Deck A is RV311 (L-CH) and RV411 (R-CH), deck B is RV301
(L-CH) and RV401 (R-CH)
so that adjustment within the following adjustment level.
Adjustment level:
CN301 playback level: 301.5 to 338.3 mV (–8.2 to –7.2 dB)
level difference between the channels: within ± 0.5 dB
Adjustment Location:AUDIO board
Adjustment Location
[LEAF SW BOARD]
test tape
P-4-A100
(10kHz, –10dB) oscilloscope
set
Waveform of oscilloscope
in phase 45
°
90 °
135 °
180 °
good wrong
MD OUT
Reverse Foward
Remove the cassette lid.
test tape
P-4-L300
(315Hz, 0dB) level meter
set
MD OUT
RV1002 RV1001
RV1002(Normal Speed
)
RV1001(High Speed)

— 17 —
Record Bias Adjustment (Deck B)
Procedure:
INTRODUCTION
Whenset to thetestmode performedinTape Speed Adjustment,
when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This “REC memory mode” is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to VIDEO 1.
(After recording, press the 0button without stopping will return
to the position where recording was started.)
1. Press FUNCTION button to selectVIDEO 1. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B, press the rREC button, and then
press the ·button to start recording.
3. Mode: Record
4. Mode: Playback
adjustment level as follows.
If these levels do not adjustment level, adjust the RV341 (L-
CH) and RV441 (R-CH) on theAUDIO board to repeat steps 3
and 4.
Adjustment level: The playback output of 10 kHz level difference
against 315 Hz reference should be ± 1.0 dB.
Adjustment Location:AUDIO board
Record Level Adjustment (Deck B)
Procedure:
INTRODUCTION
Whenset to thetestmode performedinTape Speed Adjustment,
when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This “REC memory mode” is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to VIDEO 1.
(After recording, press the 0button without stopping will return
to the position where recording was started.)
1. Press FUNCTION button to selectVIDEO 1. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B, press the rREC button, and then
press the ·button to start recording.
3. Mode: Record
4. Mode: Playback
5. Confirm playback the signal recorded in step 2 become
adjustment level as follows.
If these levels do not adjustment level, adjust the RV301 (L-
CH) and RV351 (R-CH) on the MAIN board to repeat steps 3
and 4.
Adjustment level:
CN403 playback level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
Adjustment Location:
[AUDIO BOARD] (Conductor Side)
5. Confirm playback the signal recorded in step 2 become
[MAIN BOARD] (Conductor Side)
recorded
position level meter
set
MD OUT
AF OSC
VIDEO 1 (AUDIO) IN
1) 315 Hz
2) 10 kHz
blank tape
CS-123
set
attenuator 600
Ω
} 50 mV (–23.8 dB)
AF OSC
VIDEO 1 (AUDIO) IN
315Hz 50 mV (–23.8 dB)
blank tape
CS-123
set
attenuator 600
Ω
recorded
position level meter
set
MD OUT
Record Level (Lch)
RV301
RV351
Record Level (Rch)
IC3015643 42
29
28
15
14
1
1
3
RV441 RV341
RV301(Lch),RV401(Rch)
Playback Level (Deck B)
RV301 RV401
RV341(Lch),RV441(Rch)
Record Bias RV311(Lch),RV411(Rch)
Playback Level (Deck A)
RV311 RV411

— 18 —
CD SECTION
Note:
1. CD Block is basically constructed to operate without
adjustment. Therefore, check each item in order given.
2. UseYEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MΩimpedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
S Curve Check
Procedure :
1. Connect the oscilloscope to test points TP (FE) and TP (VC).
2. Connect TP (FEI) and GND, and TP (AGCCON) and GND of
the BD board with lead wires.
3. Press the 1/ubutton to turn the set ON.
4. With the disc (YEDS-18) loaded, press the ·P button and
perform focus search. (Focus search will be performed in the
same way even while the disc table is pushed in and out.)
5. Check the symmetry and peak to peak level of the oscilloscope
waveform (S curve) at this time.
S-curve waveform
6. After check, remove the lead wire connected in step 2.
Note: • Try to measure several times to make sure than the ratio of
A : B or B : A is more than 10 : 7.
• Take sweeptime as long aspossibleand lightupthe bright-
ness to obtain best waveform.
RF Level Check
Procedure :
1. Connect oscilloscope to test point TP (RF) and TP (VC) on
BD board.
2. Connect TP (AGCCON) and GND of the BD board with lead
wires.
3. Press the 1/ubutton to turn the set ON.
4. Put disc (YEDS-18) in and playback 5 track.
5. Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.
6. After check, remove the lead wire connected in step 2.
Adjustment Location :
[ BD BOARD ] — SIDE A —
Procedure:
1. Connect oscilloscope to test point TP (TE) on BD board.
2. Press the 1/ubutton to turn the unit ON.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the ·P button.
5. Check the level B of the oscilloscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following:
• A/B x 100 = less then ± 22 (%)
• B = 1.3 ± 0.6 Vp-p
1 track jump waveform
E-F Balance (1Track Jump) check
oscilloscope
BD board
TP (FE)
TP (VC) +
–
symmetry
A
B
Within 4
± 1 Vp-p
oscilloscope
BD board
TP (RF)
TP (VC) +
–
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.45 ± 0.25 Vp-p
0V
Center of the waveform
B
Symmetry
A (DC voitage)
level : 1.3
± 0.6 Vp-p
oscilloscope
BD board
TP (TE)
TP (VC) +
–
TP
(VC)
TP
(RF)
TP
(TE) TP
(FE1)
TP (FE)
TP
(AGCCON)
Note: Clear RF signal waveform means that the shape “◊” can be
clearly distinguished at the center of the waveform.
RF signal waveform

HCD-DR8AV/W900AV
— 19 —
7-1. CIRCUIT BOARDS LOCATION
TUNER UNIT
SURROUND AMP board
JACK board
TC-B board
TC-A board
FL board
PANEL VR board
FRONT INPUT board
TRANS board
SUB TRANS board
(W900AV)
MAIN boar
d
PA board
CD-L board
CD-R board
LED (PANEL) board
DOOR SW board
BD board
LED (CD) board
CD MOTOR board
TABLE SENSOR board
AUDIO board
LEAF SW board
SECTION 7
DIAGRAMS

HCD-DR8AV/W900AV
— 21 — — 22 —
7-2. BLOCK DIAGRAMS
BD SECTION
E
F
A
BC D
A
CRF
FF
TE
D
B
E
F
LD
PD
VCC
VC
RF
SUMMING
AMP
FOCUS
ERROR
AMP
TRACKING
ERROR
AMP
LD
DRIVE
Q101 VC
BUFFER
INTEG-
RATOR
RF EQ
AMP
INTEG-
RATOR DIGITAL
PLL
IC101
DIGITAL SERVO
DIGITAL SIGNAL PROCESSOR
SUBCODE
PROCESSOR
SERIAL IN
INTERFACE
SERVO
AUTO
SEQUENCER
SERVO
INTERFACE
OVER SAMPLING
DIGITAL FILTER
D/A
INTERFACE DIGITAL OUT
TIMING
LOGIC
ERROR
CORRECTOR
EFM
DEMODULATION
APCLD/PD
AMP
5
7
8
6
16
14 49
51
13
LDON
VC
22
1521
12
11
10
3
IC103
RF AMP
VC
4
VREF
HOLD SW REF
IC102
FOCUS/TRACKING COIL DRIVE
SPINDLE/SLED MOTOR DRIVE
11
12
T+
T–
14
13
F+
F–
TRACKING
COIL
FOCUS
COIL
CH2OUTR
CH2OUTF 5
CH2FIN 6
CH2RIN
2
CH1FIN 3
CH1RIN
23
CH3RIN 24
CH3FIN
25
CH4SIN 27
CH4BIN
20
MUTE
CH1OUTF
CH1OUTR
17
18
SD+
SD–
CH3OUTF
CH3OUTR
M
15
16
SP+
SP–
CH4OUTF
CH4OUTR
M
M102
SLED
MOTOR
M101
SPINDLE
MOTOR
TFDR
TRDR
FFDR
FRDR
SRDR
SFDR
VC
FD
PD
LASER
DIODE
A
C
D
B
E
F
DETECTOR
OPTICAL PICK-UP BLOCK
(KSS-213D/Q-NP)
LD
POWER
RF AC
ASYI
48
38
42
43
39
40
41
28
26
29
ASYO ASYMMETRY
CORRECTION
SFDR
MDP
SRDR
33
32 FRDR
FFDR
31
30
42
TRDR
TFDR
SE
CE
TE
FE
RFDC
CE
VC
SLED
PWM
GENERATOR
FOCUS
PWM
GENERATOR
TRACKING
PWM
GENERATOR
PWM
GENERATOR
SLED
SERVO
FOCUS
SERVO
TRACKING
SERVO
SERVO DSP
DIGITAL
CLV
OPERATIONAL
AMPLIFIER
ANALOG
SWITCH
A/D
CONVERTER
16K
RAM
DATA BUS
3rd ORDER
NOISE SHAPER
PWM PWM
CPU
INTERFACE
2
1
3
SQSO
60
D OUT
67
XTAO
66
XTAI
8
SENS
20
SCOR
14
XLON
XRST
SQCK
5
DATA
6
XLAT
7
CLOK
9
SCLK
27
SSTP
70
AOUT1
71
AIN1
72
LOUT1
77
AOUT2
76
AIN2
75
LOUT2
L OUT
R OUT
HOLD
+5V
SQCK
SCOR
CLOK
XLT
DATA
SENS
SQSO
XRST
DOUT
X101
16.9344MHz
A
MAIN
SECTION
(Page 25, 27)
16
S101
LIMIT SW
• SIGNAL PATH
: CD
: Digital out