Sony HCD-V8900 User manual

– 1 –
MICROFILM
SPECIFICATIONS
COMPACT DISC DECK RECEIVER
— Continued on next page —
HCD-V8900/V8900AVisthetuner,deck,CDand
amplifier section in LBT-V8900AV/V8900S.
HCD-V8900/V8900AV
E Model
HCD-V8900/V8900AV
Chinese Model
HCD-V8900AV
Model Name Using Similar Mechanism HCD-V4500
CD Mechanism Type CDM37L-5BD21AL
Base Unit Type BU-5BD21AL
Optical Pick-up Type KSS-213D/Q-NP
Model Name Using Similar Mechanism HCD-V4500
Tape Transport MechanismType TCM-220WR2
CD
SECTION
TAPE
DECK
SECTION
Photo : HCD-V8900AV
SERVICE MANUAL

– 2 –
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation 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.
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 PROD-
UCT MARKING is located on
the rear exterior.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK!OR DOTTED LINE
WITH 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.

– 3 –
TABLE OF CONTENTS
7-12. Printed Wiring Board – Main Section – ...........................47
7-13. Schematic Diagram – Main (1/5) Section – .....................49
7-14. Schematic Diagram – Main (2/5) Section – .....................51
7-15. Schematic Diagram – Main (3/5) Section – .....................53
7-16. Schematic Diagram – Main (4/5) Section – .....................55
7-17. Schematic Diagram – Main (5/5) Section – .....................57
7-18. Printed Wiring Board – Deck Section – ...........................59
7-19. Schematic Diagram – Deck Section – .............................. 61
7-20. Printed Wiring Board – Power Section – ......................... 63
7-21. Schematic Diagram – Power Section – ............................ 65
7-22. Schematic Diagram – Panel Section – ............................. 67
7-23. Printed Wiring Board – Panel Section –........................... 69
7-24. Printed Wiring Board – TC/CD Panel-1 Section –........... 71
7-25. Schematic Diagram – TC/CD Panel-1 Section – ............. 73
7-26. Schematic Diagram – HP/Mic Section –.......................... 75
7-27. Printed Wiring Board – HP/Mic Section – .......................77
7-28. Printed Wiring Board – CD Motor Section – ................... 79
7-29. Schematic Diagram – CD Motor Section –...................... 81
7-30. Printed Wiring Board – Trans Section –........................... 83
7-31. Schematic Diagram – Trans Section – .............................85
7-32. Printed Wiring Board – Surround Section –..................... 87
7-33. Schematic Diagram – Surround Section – ....................... 88
7-34. IC Block Diagrams ...........................................................89
7-35. IC Pin Functions ...............................................................96
8. EXPLODEDVIEWS
8-1. Case and Back Panel Section............................................ 113
8-2. Front Panel Section-1........................................................ 114
8-3. Front Panel Section-2........................................................ 115
8-4. Chassis Section ................................................................. 116
8-5. TC Mechanism Section-1 (TCM-220WR2) ..................... 117
8-6. TC Mechanism Section-2 (TCM-220WR2) ..................... 118
8-7. TC Mechanism Section-3 (TCM-220WR2) ..................... 119
8-8. CD Mechanism Section (CDM37L-5BD21L).................. 120
8-9. Base Unit Section (BU-5BD21AL) .................................. 121
9. ELECTRICAL PARTS LIST ...................................... 122
1. GENERAL ..........................................................................4
2. DISASSEMBLY
2-1. Front Panel ........................................................................... 5
2-2. Main Board ........................................................................... 6
2-3. Tape Mechanism Deck ..........................................................6
2-4. Cassette Lid Assembly .......................................................... 7
2-5. CD Lid Assembly ..................................................................7
2-6. CD Mechanism Deck ............................................................8
2-7. Base Unit ..............................................................................8
2-8. Disc Table ............................................................................. 8
3. SERVICE MODE ..............................................................9
4.TEST MODE ..................................................................... 11
5. MECHANICAL ADJUSTMENTS ..........................12
6. ELECTRICAL ADJUSTMENTS ............................... 12
7. DIAGRAMS
7-1. Circuit Boards Location ......................................................17
7-2. Block Diagrams
• KEY CON Section........................................................... 18
• CD Section ....................................................................... 19
• Video Section ................................................................... 21
• Deck Section .................................................................... 23
• Main Section .................................................................... 25
• Power Section .................................................................. 27
7-3. Printed Wiring Board – CD Section –.................................31
7-4. Schematic Diagram – CD Section – ................................... 33
7-5. Printed Wiring Board – Video Section –............................. 35
7-6. Schematic Diagram – Video (1/4) Section –....................... 37
7-7. Schematic Diagram – Video (2/4) Section –....................... 39
7-8. Schematic Diagram – Video (3/4) Section –....................... 41
7-9. Schematic Diagram – Video (4/4) Section –....................... 43
7-10. Printed Wiring Board – Key Control Section – ................45
7-11. Schematic Diagram – Key Control Section –................... 46
MODEL IDENTIFICATION
— BACK PANEL —
V8900AV: SP, MY
V8900AV: CH
V8900AV: IA
V8900
MODEL PARTS No.
4-900-073-0π
4-900-073-1π
4-900-073-2π
4-900-073-3π
• Abbreviation
SP : Singapore model
MY : Malaysia model
IA : Indonesian model
CH : Chinese model
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, ob-
serve from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the “S curve check” in “CD section adjustment” andcheck
that the S curve waveform is output two times.

– 4 –
SECTION 1
GENERAL
LOCATION OF PARTS AND CONTROLS
11/u (power) button
2DISPLAY/DEMO button
3SPECTRUM ANALYZER
button
4Display Window
5ENTER/NEXT button
6TUNER MEMORY button
7TUNING MODE button
8TUNER/BAND button
9TUNING (+/–) button
0STEREO/MONO button
!¡ EFFECT button
!™ GROOVE button
!£ FUNCTION button
!¢ VOLUME control
!∞ SUPER WOOFER button
!§ GEQ control buttons
!¶ SUPER W MODE button
!• Deck B ª, ·button
!ª Deck B pbutton
@º Deck B 0, )button
@¡ Deck B rREC button
@™ Deck B Pbutton
@£ CD SYNC button
@¢ H SPEED DUB button
@∞ Deck B 6EJECT button
@§ CD ·button
@¶ CD Pbutton
@• CD pbutton
@ª REPEAT button
#º PLAY MODE button
#¡ ≠AMS ±dial
#™ 1/ALL DISCS button
#£ EDIT button
#¢ CD 0, )button
#∞ DISC SKIP button
#§ 6OPEN button
#¶ FLASH button
#• AUTO PBC indicator
#ª NEXT button
$º LOOP button
$¡ PBC indicator
$™ PREV button
$£ NON-STOP button
$¢ VCD indicator
$∞ ˆRETURN button
$§ DISC1-DISC5 buttons
$¶ DeckA 6EJECT button
$• DOLBY NR button
$ª DIRECTION button
%º DeckA pbutton
%¡ DeckA 0, )button
%™ DeckA ª, ·button
%£ PHONES jack
%¢ KARAOKE PON/MPX
button
%∞ KEY CONTROL ˜button
%§ KEY CONTROL nbutton
%¶ ENTER button
%• ECHO LEVEL knob
%ª MIC jack
^º MIC LEVEL knob
^¡ WAVE button
^™ DSP button
^£ PROLOGIC button
^¢ P FILE MEMORY button
^∞ GEQ CONTROL button
^§ Equalizer indicators
^¶ SLEEP button
^• DAILY 2 button
^ª DAILY 1 button
&º t/CLOCK SET button
&¡ REC button
1 834 576
2
9
!º
!™
!¢
!∞
!§
!¶
!£
!¡
!•
!ª
@º
@¡
@™
@£
@¢
@∞
@§
@¶
@•
@ª
#º
#¡#™#£
#¢
#∞#§
#¶
#•
#ª
$º
$¡
$™
$£
$¢
$∞
$§
$¶
$•
$ª
%º
%¡
%™
%£
%¢%∞%§%¶
%•
%ª
^º
^¡^™^£^¢^∞
^§
^¶
^•
^ª
&º
&¡
Front Panel

– 5 –
SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
2-1. FRONT PANEL
1 Three flat type wires
(CN401, CN402, CN701)
3 Front panel
2 Four screws (BVTP3x8)
This section is extracted from
instruction manual.

– 6 –
2-2. MAIN BOARD
3 Three screws
(BVTP2.6x8)
2 Open the cassette lids.
1 Push the two buttons.
4 Three screws (BVTP2.6x8)
5 Remove the tape mechanism deck
section to direction of the arrow
A .
A
2-3.TAPE MECHANISM DECK
9 Connector
(CN601)
4 Power cord
5 Back panel
3 Six screws (BVTP3x8)
2 Twelve screws
(BVTP3x8)
1 Flat type wire (CN851)
!£ MAIN board
6 Connector
(CN961)
8 Connector
(CN830)
!™ Connector
(CN901)
!¡ Two screws
(BVTP3x8)
0 Connector
(CN9001)
7 Flat type wire
(CN801)

– 7 –
2-4. CASSETTE LID ASSEMBLY
2-5. CD LID ASSEMBLY
2 Connector (CN671)
1 Four screws (BVTP2.6x8)
4 CD lid assembly
3 Connector (CN661)
4 Cassette lid assembly
1 Two springs
3 Two bracket
2 Two screws (BVTP2.6x8)

– 8 –
2-6. CD MECHANISM DECK 2-7. BASE UNIT
1 Five screws
(BVTP3x8)
3 Flat type wire
2 CD mechanism
deck
3 Base uni
t
2 Boss
1 Yoke bracket
2-8. 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.
1 Screw (BVTP3x8)
2 Bracket (BU)
3 Stop screw
4 Disc table
A
A

– 9 –
SECTION 3
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 SPECTRUMANALYZER , ENTER , and DISC 1 simultaneously.
2. The fluorescent indicator tube becomes blank instantaneously, and the set is reset.
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 PLAY MODE 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 SPECTRUMANALYZER , ENTER , and DISC 2 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. Select the function “CD”.
2. Press three buttons SPECTRUMANALYZER , ENTER , and FUNCTION simultaneously.
3. The Sled Servo mode is selected, if “CD” is blanking on the fluorescent indicator tube.
4. With the CD in stop status, press )button in CD section to move the pick-up to outside track, or 0button to inside track.
5. To exit from this mode, perform as follows:
1) Move the pick-up to the most inside track.
2) Press three buttons in the same manner as step 2.
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 FUNCTION Name
• The FUNCTION name of external input terminal can be changed over to VIDEO or MD. With the FUNCTION selected to “MD”, about
5dB mute is applied to the input gain.
Procedure:
1. Press 1/ubutton to turn the set OFF.
2. Press 1/ubutton together with FUNCTION button, and the power is turned on, the display of fluorescent indicator tube changes to
“MD” or “VIDEO” instantaneously, and thus the FUNCTION is changed over.
Change-over of AMTuner Step between 9kHz and 10kHz
• 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/NEXT 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 SPECTRUMANALYZER , ENTER , and DISC 3 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 1 J0 V0”. 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 ±(JOG) 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.

– 10 –
Aging Mode
This mode can be used for operation check of CD section and tape deck section.
• If an error occurred:
The aging operation stops.
• If no error occurs:
The aging operation continues repeatedly.
1. Aging Mode in CD Section
1-1. Operating procedure of Aging Mode
1. Set discs in DISC 1 and DISC 3 trays.
2. Select the function “CD”.
3. Press three buttons SPECTRUM ANALYZER , ENTER , and KARAOKE PON/MPX simultaneously.
4. The aging mode is activated, if a roulette mark on the fluorescent indicator tube is blinking.
5. In the aging mode, the aging is executed in a sequence given in “1-2. Operation during Aging Mode”.
The aging continues unless an alarm occurred.
6. To exit from the aging mode, press 1/ubutton to turn the set OFF.
• If a button other than buttons In CD section is pressed during aging, the aging in the CD section is finished.
• To execute aging to the tape deck section successively, press ·button in the deck A.
“AGING” is displayed on the fluorescent indicator tube. (For the aging in tape deck, see “2. Aging Mode in Tape Deck Section”.
1-2. Operation during aging Mode
In the aging mode, the program is executed in the following sequence.
1. The disc tray turns to select a disc. (For a disc selection sequence, see Section 1-3.)
2. TOC of disc is read.
3. The pick-up accesses to the last track.
4. Steps 1 through 3 are repeated.
1-3. Disc Selection Sequence
• During the aging mode, discs are selected in the following sequence:
Disc 1 →Disc 3
↑↓
Disc 3 ←Disc 1
2. Aging Mode in Tape Deck Section
2-1. Operating procedure ofAging Mode
1. Load a commercially available 10-minute tape into the decks A and B respectively.
(If a 10-minute tape is not available, another tape may be used but a cycle time will be longer.)
2. Select the function “TAPE”.
3. Rewind tapes in advance by pressing 0button respectively on decksA and B.
4. Press three buttons SPECTRUM ANALYZER , ENTER , and KARAOKE PON/MPX simultaneously.
5. Press ·button on deck A. (This button triggers the aging mode.)
6. The aging mode is activated if “AGING A” is displayed on the fluorescent indicator tube.
7. In the aging mode, the aging is executed in a sequence given in “2-2. Operation duringAging Mode”.
The aging continues unless an alarm occurred.
8. To exit from the aging mode, press 1/ubutton to turn the set OFF.
2-2. Operation during Aging Mode
In the aging mode, the program is executed in the following sequence.
1. A tape on FWD side is played for one minute.
2. PAUSE STOP is made.
3. Recording is made for 3 minutes. (For the deck not having the record function, the play is executed.)
4. FF is executed up to the end of tape.
5. A tape is reversed, and the tape on REV side is played for one minute.
6. PAUSE STOP is made.
7. Recording is made for 3 minutes. (For the deck not having the record function, the play is executed.)
8. FF is executed up to the end of tape.
9. Steps 1 through 8 are executed for the other deck.
10. Steps 1 through 9 are repeated unless an alarm occurred.
2-3. Deck Selection Sequence
• During the aging mode, decks are selected in the following sequence:
DeckA (FWD) →Deck A (REV)
↑↓
Deck B (REV) ←Deck B (FWD)

– 11 –
SELF-DIAGNOSIS
This model has the self-diagnosis function for the VIDEO and
AUDIO decoder sections.
Immediatelyafter the power on, the self-diagnosisfunction searches
each operation of IC’s around the mechanism control microcom-
puter (IC701).
The results can be checked by connecting an oscilloscope to TP709
(LED) of the VIDEO board.
Oscilloscope (Waveform) Symptom
H
L
Light
H
L
1 time blinking
H
L
3 time blinkin
g
No error
DRAM (IC251) error
H
L
2 time blinking
External SRAM (IC751)
error
MPEG decoder (IC201)
error
oscilloscope
VIDEO board
TP709 (LED) +
–
[VIDEO BOARD] (SIDE B)
X901
TP709 (LED)
IC751 IC251
SECTION 4
TEST MODE
VIDEO CD COLOR-BARS MODE
On this mode, the data of the color-bars signal as a picture signal
and the 1kHz sine wave signal as a sound signal are output by the
mechanism control microcomputer (IC701) for video CD signal
check. When measurement of the voltage and waveform on the
VIDEO board, perform it in this mode.
For refernce,thecolor-bars signal can be observedat J9001 (VIDEO
OUT) and the sound signal can be observed at J101 (VIDEO (AU-
DIO) OUT) using an oscilloscope.
1. Connect the lead wire to both ends of the land of SL701 (CAL
BAR) of the VIDEO board.
2. Turn the power on. Press FUNCTION button to select CD.
3. After 2 or 3 seconds later, connect the lead wire.
4. After measuring, remove the lead wire connected.
NOTE:
The 1 kHz sine wave is not outputted when the CD is played once,
but it is not error. [VIDEO BOARD] (SIDE B)
SL703 (AFADJ)
IC751 IC251
SL702 (ADJ)
SL701 (CAL BAR)
E-F BALANCE MODE
• Refer to SECTION 6 ELECTRICAL ADJUSTMENTS page 15.
1. Connect the lead wire to both ends of the land of SL702 (ADJ)
and SL703 (AFADJ) of the VIDEO board.
2. Turn the power on. Press FUNCTION button to select CD.
3. Short-circuit the lead wire. (At this time, “DISC” on the fluores-
cent indicator tube will blink (test mode). If it is not blinking,
perform from step 1 again.)
4. Press the ·button in playback.
5. Every pressing the REPEAT button, the tracking servo and the
sledding servo are turned on or off.
6. When the servo is OFF, the counter on front panel will not be
changed.
7. After measuring, remove the lead wire connected step 1.

– 12 –
SECTION 5
MECHANICAL ADJUSTMENTS
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 demagne-
tizer.
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 sup-
ply voltage unless otherwise noted.
Torque Measurement
2 to 6 g • cm
(0.02 - 0.08 oz • inch)
36 to 61 g • cm
(0.5 - 0.84 oz • inch)
Mode Torque meter
FWD
FWD
back tension
REV
FF/REW
REV
back tension
FWD tension
REV tension
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
36 to 61 g • cm
(0.5 - 0.84 oz • inch)
2 to 6 g • cm
(0.02 - 0.08 oz • inch)
61 to 143 g • cm
(0.85 - 1.99 oz • inch)
100 g or more
(3.53 oz or more)
100 g or more
(3.53 oz or more)
Meter reading
SECTION 6
ELECTRICAL ADJUSTMENTS
DECK SECTION 0 dB=0.775V
1. Demagnetizetherecord/playbackheadwithaheaddamagnetizer.
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 sup-
ply 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 adjust-
ment.)
6. The adjustments should be performed for both L-CH and R-CH.
7. Switches and controls should be set as follows unless otherwise
specified.
Record/Playback Head Azimuth Adjustment
(Deck A, Deck B)
Note: Perform this adjustments for both decks.
Procedure:
1. Mode : Playback
Signal Used forTape
Azimuth Adjustment
Tape SpeedAdjustment
Level Adjustment
10 kHz, –10 dB
3 kHz, 0 dB
315 Hz, 0 dB
P-4-A100
WS-48B
P-4-L300
test tape
P-4-A100
(10kHz, –10dB) main board
CN403
Pin
3 (L-CH)
Pin
1 (R-CH)
level meter
set
main board
CN403
Pin
2
(
GND
)

– 13 –
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location: Playback Head (DeckA)
Record/Playback/Erase Head (Deck B)
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.
3. Mode: Playback
Tape Speed Adjustment (Deck A)
Note: Set the test mode using the following method and begin tape
speed adjustment.
Inthetestmode, thetape willmoveatdouble speedor normal
speed each time the H SPEED DUB button is pressed.
Procedure :
With the power turned ON, press the SPECTRUMANALYZER
button, ENTER button, and EFFECT button simultaneously.
(The “VOLUME” on the fluorescent display tube will blink while
in the test mode.)
To exit the test mode, press the 1/ubutton.
1. Load WS-48B into deck B.
2. Play deck B.
3. Press the H SPEED DUB button and play the tape at double
speed.
4. Adjust RV652 of the AUDIO board so that the reading of the
frequency counter becomes 6000 ± 180 Hz.
5. Press the H SPEED DUB button and play the tape at normal
speed.
6. Adjust RV651 of the AUDIO board so that the reading of the
frequency counter becomes 3000 ± 90 Hz.
Adjustment Location: AUDIO board
SampleValue ofWow 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:
CN403 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
L-CH
peak
R-CH
peak
screw
position
output
level within
1 dB
L-CH
peak R-CH peak
screw
position
within 1dB
test tape
P-4-A100
(10kHz, –10dB) oscilloscope
set
L
R
Waveform of oscilloscope
in phase 45
°
90 °
135 °
180 °
good wrong
main board
CN403
Pin
3 (L-CH)
Pin 2 (GND)
Pin
1 (R-CH)
test tape
P-4-L300
(315Hz, 0dB) level meter
set
main board
CN403 Pin
3 (L-CH)
Pin
1 (R-CH)
revers
e
forward

– 14 –
Record Bias Adjustment (Deck B)
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjust-
ment,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 ad-
justment. During recording, the input signal FUNCTION will auto-
matically switch to VIDEO.
1. Press FUNCTION button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Load a tape into deck B, and press the rREC button.
3. Mode: Record
4. Mode: Playback
5. Confirm playback the signal recorded in step 2 become adjust-
ment 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
When set to the test mode performed in Tape Speed Adjust-
ment, 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 au-
tomatically switch toVIDEO.
1. Press FUNCTION button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Load a tape into deck B, and press the rREC button.
3. Mode: Record
4. Mode: Playback
5. Confirm playback the signal recorded in step 2 become adjust-
ment 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)
recorded
position level meter
set
main board
CN403 Pin
3 (L-CH)
Pin
1 (R-CH)
recorded
position level meter
set
main board
CN403 Pin
3 (L-CH)
Pin
1 (R-CH)
[MAIN BOARD] (Component Side)
CN403 IC401
13
RV351
Record Level
(R CH)
RV301
Record Level (L CH)
RV341(Lch),RV441(Rch)
Record Bias
RV301
RV401 RV441 RV341
RV301(Lch),RV401(Rch)
Playback Level (Deck B)
RV651 (Normal Speed)
RV652 (High Speed)
Tape Speed
RV651
RV311(Lch),RV411(Rch)
Playback Level (Deck A)
RV652
RV311
RV411
AF OSC
VIDEO (AUDIO)
1) 315 Hz
2) 10 kHz
blank tape
CS-123
set
attenuator 600
Ω
} 50 mV (–23.8 dB)
AF OSC
VIDEO (AUDIO)
1) 315 Hz
2) 10 kHz
blank tape
CS-123
set
attenuator 600
Ω
} 50 mV (–23.8 dB)

– 15 –
CD SECTION
NOTE :
1. CD Block is basically designed 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 objectlensbyan applicatorwithneutraldetergent when
the signal level is low than specified value with the following
checks.
S Curve Check
Note : A clear RF signal waveform means that the shape “◊” can
be clearly distinguished at the center of the waveform.
RF signal waveform
Procedure :
1. Connect oscilloscope to test point TP (FE) on BD board.
2. Connect between test point TP (FEI) and TP (VC) by lead wire.
3. Turned Power switch on.
4. Put disc (YEDS-18) in and turned Power switch on again and
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
5. Check the oscilloscope waveform (S-curve) is symmetrical be-
tween A and B.
And confirm peak to peak level within 3±1Vp-p.
S-curve waveform
oscilloscope
BD board
TP (FE)
TP (VC) +
–
symmetry
A
B
Within 3
± 1 Vp-p
6. After check, remove the lead wire connected in step 2.
Note : • Try to measure several times to make sure than the ratio
ofA : B or B :A is more than 10 : 7.
• Takesweeptimeaslongas possible and lightupthebright-
ness to obtain best waveform.
RF Level Check
oscilloscope
BD board
TP (RF)
TP (VC) +
–
Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.3 Vp-p
+0.25
–0.20
E-F Balance (Traverse) Check
oscilloscope
BD board
TP (TE)
TP (VC) +
–
Procedure :
1. Connect oscilloscpe to test point TP (TE) on BD board.
2. Connect the lead wire to both ends of the land of SL702 (ADJ)
and SL703 (AFADJ) of theVIDEO board.
3. Turned Power switch on. Press FUNCTION button to select
CD.
4. Short the lead wire.
5. Put disc (YEDS-18) in to play the number five track.
6. Press the REPEAT button. (The tracking servo and the sled-
ding servo are turned OFF.)
7. Check the level B of the oscilliscope's waveform and theA (DC
voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
Traverse waveform
0V
level : 1.3 ± 0.6 Vp-p
A (DC voltage)
Center of the waveform
B
8. Press the REPEAT button. (The tracking servo and sledding
servo are turned ON.) Confirm the C (DC voltage) is almost
equal to theA (DC voltage) is step 7.
Traverse waveform
0V C (DC
voltage)
Tracking servo
Sled servo
OFF
Tracking servo
Sled servo
ON
9. Remove the lead wire connected step 1.

– 16 –
VIDEO SECTION
Video Frequency adjustment
1. Connect the frequency counter to check point of the VIDEO
board.
frequency counter
VIDEO board
TP410 (DCLK) +
–
2. Adjust CT401 of theVIDEO board so that the frequency counter
read 13.5MHz ± 40Hz at STOP condition.
Adjustment Location :
[ BD BOARD ] — SIDE A — [ VIDEO BOARD ] — SIDE B —
120
10 11
IC103 (RF)
(FE)
(FEI)
(TE)
(VC)
IC101
SL703 (AFADJ)
IC751 IC251
SL702 (ADJ)
SL701 (CAL BAR)
CT401
Video
Frequency
TP410 (DCLK)

HCD-V8900/V8900AV
– 17 – – 18 –
7-2. BLOCK DIAGRAMS
– KEY CON SECTION –
SECTION 7
DIAGRAMS
Note: pA is including in AUDIO board.
7-1. CIRCUIT BOARDS LOCATION
J761
MIC LEVEL
RV760
MIC 1 31
J762
MIC 2
IC1403
67
1298
5
34
91011
Q1401
789
L OUT
A
MAIN
SECTION
• R CH : Same as Lch
• Signal path
: FM
: MIC
(Page 25)
22 15
MIX
OUT
LPF1
IN
Rch
DATA
CLK
LATCH
K CON
L IN
DATA CLOCK STORBE
KEY CONTROL
IC1401
SWITCH
ECHO LEVEL
RV761
IC761
ECHO
LPF1 LPF2
IC760 (2/2)
ECHO AMP
IC760 (1/2)
MIC AMP
09
p A
MOTOR board
AUDIO board
(including
p A)
TABLE SENSOR board
CD MOTOR board
LED board
BD board
LEAF SWITCH boar
d
TRANS board
PANEL board
HP/MIC board
TC-A SW board
CD-LED board
CD-A SW board
DOOR SW board
TC-B SW board CD-B2 SW board CD-B1 SW board
POWER board
VIDEO board
VIDEO OUT board
KEYCON board
MAIN board
SURROUND boar
d
FM/AM TUNER PACK
VIDEO POWER board

HCD-V8900/V8900AV
– 19 – – 20 –
– CD SECTION –
APC LD
AMP
RF AMP
IC103
1
2
19
3
4
5
6
RF
SUMMING
AMP
RF FQ
AMP
FOCUS
ERROR
AMP 15
TRACKING
ERROR
AMP
13
1110
VC
BUFFER 12 VC
VC
FOCUS/TRACKING COIL DRIVE
SPINDLE/SLED MOTOR DRIVE
IC102
1
24
5
T+
T–
F+
F– 19
20
16
17
10
9
12
13
M
M102
SLED
MOTOR
M
M101
SPINDLE
MOTOR
27
26 23
24
TRACKING
COIL
FOCUS
COIL
16
RF
15MUTE
09
8
9
4
AC
BD
E
F
DETECTOR
1
OPTICAL PICK-UP
BLOCK (KSS-213D/Q-NP)
LD
DRIVE
Q101
PD
LASER
DIODE
LD
LD
POWER
INTEGRATOR
INTE-
GRATOR 28
27
26
29
RF DC
TE
SE
FE
A/D
CONVERTER
4
6
10
8
2
100
96
ASYMMETRY
CORRECTION
ASY0
RF AC
ASY1 MIX
36
MIRR
DFCT
FOK
DETECTOR
DIGITAL
PLL
EFM
DEMODULATOR
CLOCK
GENERATOR
FOK
DFCT
MIRR
SERVO DSP
FOCUS
SERVO
TRACKING
SERVO
SLED
SERVO
PWM
GENERATOR
TRACKING
PWM
GENERATOR
FOCUS
PWM
GENERATOR
SLED
PWM
GENERATOR
SYNC
PROTECTOR
CLV SERVO
PROCESSOR
1B TIMS
OVERSAMPLING
FILTER
NOISE
SHAPER
TIMING
GENERATOR 1
TIMING
GENERATOR 2
DIGITAL SERVO
DIGITAL SIGNAL PROCESSOR
IC101
62
XTAL
REGISTER
DATA BUS
ERROR
CORRECTOR
D/A
DATA
PROCESSOR
79 54
MUTE
GFS
99
S STOP
+5V
S901
LIMIT
SWITCH
TFDR
TRDR
FFDR
FRDR
SRDR
SFDR
MDP
32K
RAM
ADDRESS
GENERATOR
PRIORITY
EMCODER
SERIAL/PARALLEL
PROCESSOR
PEAK
DETECTOR
SUBCODE
Q
PROCESSOR
SUBCODE
P-W
PROCESSOR
DIGITAL
OUT
70
MD2
71
DOUT
EXCK 76
SBSO 75
77
78
SUBQ
SQCK
83
SCLK
73
74
SCOR
WFCK
47
BCLK
LRCK 45
DATA 46
+5V
384FS
LDON
SUBQ
SQCK
SCLK
ADATA
LRCK
BCK
SCOR
86
87
88
XLT
DATA
CLK XLT
DATA
CLK
CPU
INTERFACE
SERVO
AUTO
SEQUENCER
SENS SENS
80
56
C2PO
SERVO
INTERFACE
MIRR 91
92
DFCT
FOK 93
81
XRST XRST
AMUTE
UP SW
39
38
C2PO
VIDEO
SECTION
B
(Page 21)
DISC
TABLE
SENSOR
IC202
T.SENS
TBL.L
TBL.R
S201
UP SW
9
1
7
3
OUT1
OUR2
IN1
IN2
MOTOR DRIVER
IC201
M
M201
TABLE
MOTOR
C
MAIN
SECTION
(Page 25)
• R CH: Same as L ch
• SIGNAL PATH
: CD
: VIDEO

HCD-V8900/V8900AV
– 21 – – 22 –
–VIDEO SECTION –
RGB-YUV
CONV.
TIMING
GEN.
NOISE
REDUSER
YUV-RGB
CONV.
60
67
51
58
20
27
11
18
71
73
•
76
80
63
70
1
4
•
6
9
11
18
MEMORY
CONT.
DRAM
IF
29
30
31
98 10097
DCLKI
Y
C
Y
C
NOISE REDUCTION
IC301
DEMPX, LEVEL
TRANSLATOR
&
INTERPOLTATOR
VIDEO
POSTPROCESSOR
&
SYNC GENERATOR
LPF
LPF
DELAY
MODULATOR
SYNC
SLOPE
GEN.
CLOSED
CAPTION
ENCODER
SIO & I2O-BUS
CONT.
SUB
CARRIER
GEN.
SYNC GEN.
&
TIMING CONT.
49 504859 60625557 51
1/2
56
XRST
DCLK HSYNC VSYNC DCLK XVRST FID VSYNC HSYNC
VDAC-XLAT CLK DATA
3456
X401
27MHz
CT401
13.5MHZ
CLOCK GENARATOR
IC402
Y, C/Y, U, V
SELECTOR
&
INTER-
POLATOR
24
29
32
5
3
7
143
V
Y
C
10BIT VIDEO D/A CONVERTER
IC401
5 7
VIDEO AMP
IC451
Y/C AMP
IC452
J9001
VIDEO OUT
J9002
S VIDEO OUT
NR-XCS
MCLK
MDATA
MDATA
RESET
OS-XLAT
MCLK
OUTPUT
CONT.
4
3
2
1
8
OSD
IC271
VIDEO
RAM
DATA INPUT
SHIFT
RESISTOR
SYNC
CONT.
DATA
SEL.
DISPLAY
POSITION
CONT.
18
17
16
15
19
20 OSC
1 5
CK 1/2 Q 6.75MHz
DCLK
HSYNC
VSYNC
XOSDEN
OSD R
OSD G
OSD B
CLOCK
GENERATOR
IC272
97
95
92
93
94
89
56
57
58
59
118
HSYNC
XSGRST
VSYNC
FID
DCLK
XOSDEN
OSD B
OSD G
OSD R
XRST
MPEG
VIDEO
DECODER
MPEG
SYSTEM
DECODER
CD-ROM
DECODER
MPEG
AUDIO
DECODER
112
111
110
109
103
100
101
102
11
12
13
14
15
9
8
7
6
5
2
3
BUFFER
IC501 (1/2)
HOST INTERFACE
117115116114
EACH CIRCUIT BLOCK
D-RAM INTERFACE
34
301516 31
5 6•• •119 120
7–13 16
•
17–21 23 24 32 33••••
38–43 46–55•
X202
28.63636MHz
106
107
X201
45.1584MHz
XTL0O
XTL01
XTL2O
XTL2I
MPEG DECODER
IC201
18–21 24–28•
272022
55
2–10 21 23–25
••
•
2–5 7–10 35–38 40–43
••
LCAS
UCAS
W
RAS
A8 A0
DQ16
DQ1
WE CE1 OE
A12
A0
I/O8 I/O1
D-RAM
IC251
S-RAM
IC751
D0
D7
A0
A3
XHCS XWR XHDT XHIRQ
•11–13 15–19
8
10 9
6
12
11
12 13
XTCS
IC772
41 54 56 43 70 7 8
22–29 • 31–3513 – 20
3735
68494847
34
35
36
37
44
18
43
1
2
3
4
5
6
72
64
CMD0
CMD1
CMD2
CMD3
SACK
QINT
MREQ
MDATA
MCLK
OS-XLAT
NR-XCS
73
78
74
11
10
77
76
DATA
CLK
AMUTE
SQCK
SUBQ
SCLK
XLT
CMD0
CMD1
CMD2
CMD3
SACK
QINT
MREQ
NPIN
75
71
62
48
LDON
SCOR
SENS
RESET
384FS
DATA
CLK
AMUTE
SQCK
SUBQ
SCLK
XLT
LDON
SCOR
SENS
XRST
PAL
AUTO
NTSC
S9001
SYSTEM SELECT
5251
X701
10MHz
EXTAL XTAL
111052
X901
5MHz
X2 CD-XRST X1
VDAC-XLAT
DF-XLAT
WAIT
WR
XHIRQ
AS
A17
A18
RD
A12
A0
D7 D0
MECHA CONTROL
IC701
56
55
15
IIC INTERFACE
IC901
RESET
IIC-DATA
IIC-CLK
B
CD
SECTION
(Page 20)
B
CD
SECTION
(Page 20)
09
BCK
ADATA
LRCK
C2PO
384FS
ADATA
LRCK
BCLK
416
IC501
(2/2)
DATA
CLK
AMUTE
384FS
11
6
3
11 27
25
21
22
16
18
12
10
3
4
5
2
13
4
1
BUFFER
IC181
XRST
6
INPUT PLM
D/A
CONV.
MODE MUTE
CIRCUIT
ADATA
384FS
LRCK
BCLK
DATA
CLK
DF-XLAT
AMUTE
TIMING
CIRCUIT
CLOCK
GENERATOR
1
IIC-CLK
IIC-DATA
XRST
L CH
D
MAIN
SECTION
(Page 25)
2
316 7
R CH
ACTIVE LPF
IC102
X101
33.8688MHz
DIGITAL FILTER & D/A CONVERTER
IC101
• R CH: Same as L ch
• SIGNAL PATH
: VIDEO
: Y
: CHROMA
: CD
Y0-Y7
C0-C7
INT
40
54
3
IC771

HCD-V8900/V8900AV
– 23 – – 24 –
– DECK SECTION –
IC611
R CH
HP101
PB HEAD
(DECK A)
L
R
RV311
PLAYBACK
LEVEL
DECK A
IC601
R CH
L
R
RV301
PLAYBACK
LEVEL
DECK B
31IC602
4
REC/PB
EQOUT
REC BIAS BIAS OSC
T621, Q621, 622
ERASE HEAD
ERASE BIAS
4
2B IN
A IN
12
PB-A/B
EQIN 10
11
RV301
REC LEVEL
10 RECOUT
BIAS SW
NORM
CROM
70
120
DOLBY
TYPE B
+7.5V
Q623, 901
RIN 6
PB
19
14
16
17
8
20
PB OUT
LM ON/
OFF
BIAS ON/OFF
RM ON/OFF
PB L
REC L
PB A/B
NORM/HIGH
REC/PB/PASS
BIAS ON/OFF
RM ON/OFF
RELAY REC/PB
09
B
MAIN
SECTION
LM ON/OFF
NORM/
HIGH
PAS
DOL
PR
REC/PB HEAD
(DECK B)
X
DECK PROCESS DOLBY NR
IC401
HRPE101
RV341
REC
BIAS
24 25
18
NR ON/
OFF NR ON/OFF
13
S1004
A CrO2
S1008
B CrO2
15
A 120/70 B 120/70
M
CAP M SWITCH
Q405, 407
SPEED
CONTROL
Q651
SWITCH
Q406
RV652
HIGH
SPEED
RV651
NORMAL
SPEED
M1
CAPSTAN
MOTOR
CAP M ON/OFF
CAP M H / L
REEL
DETECT
Q1001 A SHUT
B SHUT
REEL
DETECT
Q1002
S1001 (A PLAY)
+5V
S1002 (B PLAY)
A PLAY
B PLAY
A HALF
S1003
(A HALF)
+5V
S1005
(REC A)
S1006
(B HALF)
S1009
(REC B)
SWITCH
Q408, 409 TRIG H / L
B TRIG
A TRIG
4
6
5
TRIGGER
MOTOR
DRIVE
IC402
VZ
IN2
IN1
OUT1
OUT2
2
10
M
M2
TRIGGER
MOTOR
BHALF
(Page 25)
• R CH : Same as L ch
• SIGNAL PATH
: PB (DECK A)
: PB (DECK B)
: REC (DECK B)
R CH
CN403
1
3