Sony HCD-XB66K User manual

MICROFILM
SERVICE MANUAL
COMPACT DISC DECK RECEIVER
E Model
SPECIFICATIONS
HCD-XB66K
Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol aare trade-
marks of Dolby Laboratories Licensing Corporation.
Model Name Using Similar Mechanism HCD290/G330/XB3
CD Mechanism Type CDM37LH-5BD29AL
Base Unit Name BU-5BD29AL
Optical Pick-up Name KSS-213D/Q-NP
Model Name Using Similar Mechanism HCD-H881
TapeTransport Mechanism Type TCM-220WR2
CD
Section
Tape deck
Section
Amplifier section
The following measured at AC 120/240 V, 50 Hz
DIN power output (Rated) 140 + 140 watts
(8 ohms at 1 kHz, DIN)
Continuous RMS power output (Reference)
170 + 170 watts
(8 ohms at 1 kHz, 10% THD)
Peak music power output (Reference)
3,000 watts
Inputs
PHONO IN (phono jacks): sensitivity 3 mV, impedance
47 kilohms
MIX MIC (phone jack): sensitivity 1 mV, impedance
10 kilohms
VIDEO/MD (AUDIO) IN (phono jacks):
sensitivity 250 mV, impedance
47 kilohms
Outputs
PHONES (stereo phone jack): accepts headphones of 8 ohms or more
VIDEO/MD (AUDIO) OUT (phono jacks):
voltage 250 mV, impedance 1 kilohms
SPEAKER: accepts impedance of 8 to 16 ohms.
CD player section
System Compact disc and digital audio system
Laser Semiconductor laser (λ= 780 nm)
Emission
duration: continuous
Laser output Max. 44.6 µW*
*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 2 Hz - 20 kHz (±0.5 dB)
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: 600 nm
Output level: –18 dBm
– Continued on next page –
Photo: XB66K

– 2 –
TABLE OF CONTENTS
1. SERVICING NOTES ............................................... 3
2. GENERAL ................................................................... 4
3. DISASSEMBLY ......................................................... 7
4. TEST MODE.............................................................. 15
5. MECHANICAL ADJUSTMENTS ........................ 17
6. ELECTRICAL ADJUSTMENTS
TAPE DECK Section ...................................................... 17
CD Section ...................................................................... 20
7. DIAGRAMS
7-1. IC Pin Function Description ........................................... 22
7-2. Block Diagram – CD Section – ..................................... 27
7-3. Block Diagram – Tape Deck Section – ......................... 29
7-4. Block Diagram – Main Section (1/2) – ......................... 31
7-5. Block Diagram – Main Section (2/2) – ......................... 33
7-6. Block Diagram – Display/Key Control/
Power Supply Section – .................................................. 35
7-7. Circuit Boards ................................................................. 37
7-8. Printed Wiring Board – CD Section (1/2) – .................. 39
7-9. Schematic Diagram – CD Section (1/2) – ...................... 41
7-10. Printed Wiring Boards – CD Section (2/2) – ................ 43
7-11. Schematic Diagram – CD Section (2/2) – ...................... 45
7-12. Printed Wiring Boards – Tape Deck Section – .............. 47
7-13. Schematic Diagram – Tape Deck Section – ................... 49
7-14. Printed Wiring Board – Main Section – ........................ 51
7-15. Schematic Diagram – Main Section (1/3) – ................... 53
7-16. Schematic Diagram – Main Section (2/3) – ................... 55
7-17. Schematic Diagram – Main Section (3/3) – ................... 57
7-18. Printed Wiring Board – Power Amp Section – ............. 59
7-19. Schematic Diagram – Power Amp Section – ................. 61
7-20. Printed Wiring Board – Panel Section (1/3) –............... 63
7-21. Schematic Diagram – Panel Section (1/3) –................... 65
7-22. Printed Wiring Boards – Panel Section (2/3) – ............. 67
7-23. Schematic Diagram – Panel Section (2/3) –................... 69
7-24. Printed Wiring Boards – Panel Section (3/3) – ............. 71
7-25. Schematic Diagram – Panel Section (3/3) –................... 73
7-26. Printed Wiring Board – Power Supply Section – ........... 75
7-27. Schematic Diagram – Power Supply Section –.............. 76
7-28. Schematic Diagram – Key-Con Section – ...................... 77
7-29. Printed Wiriing Board – Key-Con Section – .................. 77
7-30. Waveforms....................................................................... 79
7-31. IC Block Diagrams ......................................................... 80
8. EXPLODED VIEWS ................................................ 83
9. ELECTRICAL PARTS LIST ............................... 92
Tape player section
Recording system 4-track 2-channel stereo
Frequency response (DOLBY NR OFF)
60 - 13,000 Hz (±3 dB),
using a Sony TYPE I cassette
60 - 14,000 Hz (±3 dB),
using a Sony TYPE II cassette
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 - 108.0 MHz (50 kHz step)
Antenna FM wire antenna
Antenna terminals 75 ohm unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range
(2 band model) 531 - 1,602 kHz
(with the tuning interval set at 9 kHz)
530 - 1,710 kHz (with the tuning
interval set at 10 kHz)
(3 band model )
MW: 531 -1,602 kHz (with the tuning
interval set at 9 kHz)
LW: 153 - 279 kHz (with the tuning
interval set at 3 kHz)
Antenna AM loop antenna, External antenna
terminals
Intermediate frequency 450 kHz
General
Power requirements
Mexican model: 120 V AC, 50/60 Hz
Australian and South African models:
220 - 240 V AC, 50/60 Hz
Other models: 110 -120 V or 220 -240 V AC,
50/60 Hz Adjustable with voltage
selector
Power consumption 320 watts
Dimensions (w/h/d) Approx. 355 ×425 ×435 mm (14 ×
163/4×171/4in) incl. projecting parts
and controls
Mass Approx. 14.5 kg (31 lb 16 oz.)
Supplied accessories AM loop antenna (1)
Remote RM-SD70S (1)
SizeAA (R6) batteries (2)
FM wire antenna (1)
Speaker cords (2)
Design and specifications are subject to change without notice.

– 3 –
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 PUB-
LISHED BY SONY.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
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.
The following caution label is located inside the unit.
The laser diode in the optical pick-up block may suffer electro-
static 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 emis-
sion, observe 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” and
check that the S curve waveforms is output three times.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C dur-
ing 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
MODEL IDENTIFICATION
– BACK PANEL –
SECTION 1
SERVICING NOTES
PART No.
MODEL PART No.
Singapore, Malaysia model 4-996-413-1π
E, Indonesian model 4-996-413-6π
Saudi Arabia model 4-996-413-7π
Thai model 4-996-413-9π
CAUTION : INVISIBLE LASER RADIATION WHEN OPEN AND
INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM.
ADVARSEL : USYNLIG LASERSTRÅLING VED ÅBNING NÅR
SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION. UNDGÅ UDSAETTELSE
FOR STRÅLING.
VORSICHT : UNSICHTBARE LASERSTRAHLUNG, WENN
ABDECKUNG GEÖFFNET UND SICHEREITSVERRIEGELUNG
ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN.
VARO ! :AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALT-
TIINA NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN.
VARNING : OSYNLING LASERSTRÅLING NÄR DENNA DEL ÄR ÖPPNAD
OCH SPÄRREN ÄR URKOPPLAD.BETRAKTA EJ STRÅLEN.
ADVERSEL : USYNLIG LASERSTRÅLING NÅR DEKSEL ÅPNES OG
SIKKERHEDSLÅS BRYTES. UNNGÅ EKSPONERING FOR STRÅLEN.
VIGYAZAT ! :A BURKOLAT NYITÁSAKOR LÁTHATATLAN LÉZERSU-
GÁRVESZÉLY ! KERÜLJE A BESUGÁRZÁST !

– 4 –
1I /u(Power) button
2DISPLAY/DEMO button
3FILE (1-5) indicator
4Fluorescent indicator tube
5TUNER MEMORY button
6TUNING MODE button
7TUNER/BAND button and indicator
8STEREO/MONO button
9FUNCTION button
!º SUPER WOOFER button and indicator
!¡ H SPEED DUB button
!™ CD SYNC button
!£ §EJECT button (DECK B)
!¢ )button (CD)
!∞ ≠AMS ±jog dial
!§ t/CLOCK SET button
!¶ REC button
!• PHONES jack
!ª GEQ (4/(/$/9) switch
@º §EJECT button (DECK A)
@¡ DIRECT PLAY (DISC 1 to DISC 5) button
@™ Cassette holder
@£ CD lid
@¢ EFFECT button and indicator
@∞ 0button (CD)
@§ DAILY 1 button
@¶ DAILY 2 button
@• SPECTRUM ANALYZER button
@ª MUSIC/OTHERS/P FILE indicator
#º ENTER/NEXT button and indicator
#¡ TUNING (–) button
#™ TUNING (+) button
#£ GROOVE button and indicator
#¢ VOLUME control knob
#∞ SUPER W MODE button
#§ 6OPEN button (CD)
#¶ ·button and indicator (CD)
#• REPEAT button
#ª SLEEP button
$º MIC1/MIC2 jack
$¡ MIC/ECHO LEVEL control knob
$™ KARAOKE PON/MPX button
$£ NON-STOP button and indicator
$¢ LOOP button
$∞ FLASH button
$§ ENTER button and indicator
$¶ EDIT button
$• 1/ALL DISCS button
$ª PLAY MODE button
%º KEY CONTROL (˜)
%¡ KEY CONTROL (n)
!•
!ª
@¡
8
LOCATION OF CONTROLS
– Front Panel –
1 2 43 5 6 7
9
0
!¡
!™
!£
!¢
!∞
!¶
!§
@º
@™ @£ @¢ @∞
@§ @¶ @• @ª #º
#¡
#™
#£
#¢
#∞
#§
#¶
#•
#ª
$º
$¡
$™
$£
$∞$¢ $§ $¶ $• $ª
SECTION 2
GENERAL
%º %¡
This section is extracted
from instruction manual.

– 5 –
%º WAVE button
%¡ SURROUND button
%™ P FILE MEMORY button
%£ GEQ CONTROL button
%¢ Pbutton and indicator (DECK B)
%∞ pbutton (DECK B)
%§ ªbutton and indicator (DECK B)
%¶ 0button (DECK B)
%• ·button and indicator (DECK B)
%ª )button (DECK B)
^º rREC button and indicator (DECK B)
^¡ pbutton (CD)
^™ ·button and indicator (DECK A)
^£ 0button (DECK A)
^¢ ªbutton and indicator (DECK A)
^∞ pbutton (DECK A)
^§ DIRECTION button
^¶ DOLBY NR button
^• )button (DECK A)
^ª DISC SKIP button
&º Pbutton and indicator (CD)
%º %¡ %™ %£ %¢ %∞
%§
%¶
%•
%ª
^º
^¡
&º^ª^¶ ^•
^™
^£
^¢
^∞
^§
1CD DIGITAL OUT OPTICAL
2FM ANTENNA terminal
3AM ANTENNA terminal
4PHONO IN jack
5VIDEO/MD (AUDIO) IN jack
6VIDEO/MD (AUDIO) OUT jack
7SPEAKER output terminal
8VOLTAGE SELECTOR switch
1 2 3
5
6
4
7 8
– Rear Panel –

– 6 –

– 7 –
3-1. CASE
Note: Follow the disassembly procedure in the numerical order given.
SECTION 3
DISASSEMBLY
• This set can be disassembled in the order shown below.
MAIN/KEY-CON BOARD
(Page 8)
CD LID ASS’Y
SECTION
(Page 11)
TAPE MECHANISM
DECK SECTION
(Page 10)
MAIN
SECTION
(Page 9)
AUDIO BOARD
(Page 14)
CASSETTE
LID ASS’Y
(Page 10)
CD MECHANISM
DECK SECTION
(Page 9)
DISC TABLE
(Page 12)
BASE UNIT
(Page 12) BD BOARD
(Page 13)
PANEL (A)/(B)
SUB ASS’Y
(Page 11)
CAPSTAN MOTOR (M1)
(Page 14)
OPTICAL
PICK-UP
(Page 13)
SLED
MOTOR
(Page 13)
FRONT PANEL
SECTION
(Page 8)
CASE
(Page 7)
3 Case
1 Three screws
(case 3 TP2)
1 Three screws
(case 3 TP2)
2 Seven screws
(BATT3 × 6)

– 8 –
3-2. FRONT PANEL SECTION
3-3. MAIN/KEY-CON BOARD
4 Four screws
(BVTP3 × 8)
5 Front panel section
3 Wire (flat type) (17 core)
(CN102)
2 Wire (flat type) (11 core)
(CN206)
1 Wire (flat type) (21 core)
(CN205)
5 Eleven screws
(BVTP3 × 8)
7 Back panel
6 Power cord
1 Wire (flat type)
(13 core) (CN201)
2 Wire (flat type)
(19 core) (CN202)
4 Connector
(CN901)
3 Connector
(CN203)
9 Two screws
(BVTP3 × 8)
!º Connector
(CN101)
IC201
!¡ MAIN board
8 Connector
(CN105)
!™ KEY-CON board
(Remove soldering)

– 9 –
3-4. MAIN SECTION
3-5. CD MECHANISM DECK SECTION (CDM37LH-5BD29AL)
1 Flat wire (CN202)
4 Main section
3 Screw
(BVTP3
× 8)
3 Two screws
(BVTP3 × 8
)
3 Two screws
(BVTP3 × 8)
2 Connector
(CN203)
3 Five screws
(BVTP3 × 8)
4 CD mechanism
deck section
(CDM37LH-5BD29AL)
2 Flat wire
and lead wire
1 Open the clamp.

– 10 –
3-6. TAPE MECHANISM DECK SECTION (TCM-220WR2)
3-7. CASSETTE LID ASS’Y
5 Three screws
(BVTP2.6 × 8)
6 Remove the tape mechanism deck section
(TCM-220WR2) to direction of the arrow A .
2 Open the
cassette lids.
1 Push the
two buttons.
5 Three screws
(BVTP2.6 × 8)
3 Wire (flat type)
(11 core) (CN1001)
4 Wire (flat type)
(21 core) (CN601)
A
3 Two bracket
2 Two screws
(BVTP2.6 × 8
)
1 Two springs

– 11 –
3-8. CD LID ASS’Y SECTION
3-9. PANEL (A) / (B) SUB ASS’Y
5 Connector
(CN671)
6 Four screws
(BVTP2.6 × 8)
7 CD lid ass’y
4 Connector
(CN661)
2 Four screws
(BVTP2.6 × 8)
3 CD-B1 SW board
1 Connector
(CN642)
1 Connector
(CN612)
2 Four screws
(BVTP2.6 × 8
)
6 Panel (B) sub assy
4 Panel (A) sub assy
5 Two claws
3 Two claws

– 12 –
3-10. BASE UNIT
3-11. DISC TABLE
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.
3 Base unit
1 Yoke bracke
t
2 Boss
1 Screw
(BVTP3 × 8)
1 Screw
(BVTP3 × 8)
3 Step screw
4 Disc tabl
e
2 Bracket (BU)
A
A

– 13 –
1 Two screws
(PTPWH M2.6 × 8)
1 Two screws
(PTPWH M2.6 × 8)
2 Optical pick-up
section
3 Two springs
3 Two springs
4 Wire (flat type)
(16 core) (CN101
)
7 BD board
Limit switch
(S101)
5 Screw
(BVTP2.6 × 8)
6 Removal
the four solders.
3 Optical pick-up (KSS-213D/Q-NP)
6 Spindle motor
(M101)
2 Sled shaft
4 Two screw
s
(P2 × 3)
5 Sled motor
(M102)
1 Claw
3-12. BD BOARD
3-13. OPTICAL PICK-UP (KSS-213D / Q-NP) , SLED MOTOR (M102) , SPINDLE MOTOR (M101)

– 14 –
1 Connector
(CN651)
A
2 Four screws
(BTP2.6 × 4)
3 Removal the AUDIO board
to direction of the arrow A .
8 Hang two belts.
5 Two screws
(BTP2.6 × 8)
4 Break the soldering
of motor lead.
7 Removal the capstan motor (M1)
to direction of the arrow B .
6 Claw
B
3-14. AUDIO BOARD, CAPSTAN MOTOR (M1)

– 15 –
SECTION 4
TEST 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 SPECTRUM ANALYZER , 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 pickup to the position durable to vibra-
tion. Use this mode when returning the set to the customer after
repair.
Procedure:
1. Press I /ubutton to turn the set ON.
2. Press PLAY MODE button and I /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 SPECTRUM ANALYZER , 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 pickup.
Procedure:
1. Select the function “CD”.
2. Press three buttons SPECTRUM ANALYZER , 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 pickup to outside track, or 0button to inside
track.
5. To exit from this mode, perform as follows:
1) Move the pickup to the most inside track.
2) Press three buttons in the same manner as step 2.
Note:
• Always move the pickup 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]
• A step ofAM channels can be changed over between 9kHz and
10kHz.
Procedure:
1. Press I /ubutton to turn the set ON.
2. Select the function “TUNER”, and press TUNER/BAND
button to select the BAND “AM”.
3. Press I /ubutton to turn the set OFF.
4. Press ENTER and I /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 SPECTRUM ANALYZER , 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 in-
creases. 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 man-
ner as step 1, or disconnect the power cord.

– 16 –
[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 Method 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 fluo-
rescent 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 I /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 Sec-
tion”.
1-2. Operation during aging Mode
In the aging mode, the program is executed in the following se-
quence.
1. The disc tray turns to select a disc. (For a disc selection se-
quence, see Section 1-3.)
2. TOC of disc is read.
3. The pickup 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 se-
quence:
Disc 1 →Disc 3
↑ ↓
Disc 3 ←Disc 1
2. Aging Mode in Tape Deck Section
2-1. Operating Method of Aging 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 respec-
tively on decks A and B.
4. Press three buttons SPECTRUM ANALYZER ,
ENTER , and KARAOKE PON/MPX simultaneously.
5. Press ·button on deck A. (This button triggers the ag-
ing mode.)
6. The aging mode is activated if “AGINGA” is displayed on
the fluorescent indicator tube.
7. In the aging mode, the aging is executed in a sequence
given in “2-2. Operation during Aging Mode”.
The aging continues unless an alarm occurred.
8. To exit from the aging mode, press I /ubutton to turn
the set OFF.
2-2. Operation during Aging Mode
In the aging mode, the program is executed in the following se-
quence.
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 hav-
ing 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 se-
quence:
DeckA (FWD) →Deck A (REV)
↑↓
Deck B (REV) ←Deck B (FWD)

– 17 –
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
supply voltage unless otherwise noted.
• Torque Measurement
• Tape Tension Measurement
•Torque Measurement
•TapeTension Measurement
Mode Torque Meter Meter Reading
Forward CQ-102C 36 to 61g•cm
(0.50 – 0.84 oz•inch)
Forward CQ-102C 2 to 6g•cm
Back Tension (0.026 – 0.082 oz•inch)
Reverse CQ-102RC 36 to 61g•cm
(0.50 – 0.84 oz•inch)
Reverse CQ-102RC 2 to 6g•cm
Back Tension (0.026 – 0.082 oz•inch)
FF, REW CQ-201B 61 to 143g•cm
(0.85 – 1.98 oz•inch)
Mode Tension Meter Meter Reading
Forward CQ-403A more than 100 g (3.52 oz)
Reverse CQ-403R more than 100 g (3.52 oz)
0 dB=0.775 VTAPE DECK SECTION
SECTION 6
ELECTRICAL ADJUSTMENTS
1. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
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 ad-
justment should be completed before performing recording
circuit adjustment.)
6. The adjustments should be performed for both L-CH and R-
ch.
7. Switches and controls should be set as follows unless other-
wise specified.
8. Set to test mode. (Press key switch same time
SPECTRUM ANALYZER , ENTER and EFFECT but-
ton.)
•TestTape
Tape Signal Used for
P-4-A100 10 kHz, –10 dB AzimuthAdjustment
WS-48B 3 kHz, 0 dB Tape Speed Adjustment
P-4-L300 315 Hz, 0 dB Level Adjustment
Record/ Playback Head Azimuth Adjustment
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
set
main board
CN207
Pin
3 (L-CH)
Pin
1 (R-CH)
main board
CN207
Pin
2
+
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)

– 18 –
1. Mode: Playback (FWD)
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 1dB of peak.
3. Mode: Playback (FWD)
4. Repeat steps 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Record/Playback Head (Deck A and B)
and MAIN board.
Screw
position
L-CH
peak
within
1dB
output
level
L-CH
peak R-CH
peak
within
1dB
Screw
position
R-CH
peak
main
board
CN207
set
test tape
P-4-A100
(10 kHz, –10 dB)
pin
1
oscilloscope
L-CH
R-CH
VH
waveform of oscilloscope
in phase 45 °
90 ° 135 ° 180 °
good
wrong
pin 2
pin 3
L
R
revers
e
forward
Tape Speed Adjustment DECK A
Note: Start the Tape Speed adjustment as below after setting to the test
mode.
In the test mode, the tape speed is high during pressing the
H. SPEED DUBB button.
Procedure:
1. Turn the power switch on.
2. Press the SPECTRUM ANALYZER button, ENTER button
and EFFECT button simultaneously.
To exit from the test mode, press the I /ubutton.
Mode: Playback (FWD)
1. Insert the WS-48B into the deckA and the blank tape into the
deck B.
2. Press the REC button and ·button on the deck B. Then
the deck B is at recording mode.
3. Set the deck A to playback mode.
4. Keep pressing the H. SPEED DUBB button in playback mode.
Then at HIGH speed mode.
5. Adjust RV652 on the AUDIO board do that frequency counter
reads 6,000 ± 180 Hz.
6. Take off the H. SPEED DUBB button.
Then at NORMAL speed mode.
7. Adjust RV651 on the AUDIO board so that frequency counter
reads 3,000 ± 90 Hz.
8. Frequency difference between deck A and deck B the begin-
ning of the tape should be within ± 1.5%.
Adjustment Location: AUDIO and MAIN boards
SampleValue ofWow and flutter: 0.3% or less W. RMS
(WS-48B)
Playback level Adjustment
Procedure:
Mode: Playback (FWD)
Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301
(L-CH) and RV401 (R-CH) so that adjustment within adjustment
level as follows.
Adjustment Level:
CN207 PB 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 and MAIN boards
+
–
set
test tape
WS-48B
(3 kHz, 0 dB)
MAIN board
CN207 (Pin
3 : L-CH)
(Pin
1 :R-CH)
frequency counter
DECK A DECK B
+
–
set
test tape
P-4-L300
(315 Hz, 0 dB)
main board
CN207 (Pin
3 : L-CH)
(Pin
1 : R-CH)
level meter

– 19 –
Record bias Current Adjustment
Procedure:
1. Mode: Record
2. Mode: Playback
Confirm playback the signal recorded in step 1 become adjustable
limits as follows.
If these levels do not adjustable limits, adjustment the RV341 (L-
CH) and RV441 (R-CH) on the AUDIO board to repeat steps 1
and 2.
Adjustable limits: Playback output of 315 Hz to playback output
of 10 kHz: 0 ± 0.5 dB
Adjustment Location: AUDIO and MAIN boards
Record Level Adjustment
Procedure:
1. Mode: Record
2. Mode: Playback
Confirm playback the signal recorded in step 1 become adjustable
limits as follows.
If these levels do not adjustable limits, adjustment the RV1501
(L-CH) and RV1551 (R-CH) on the MAIN board to repeat steps 1
and 2.
Adjustable limits:
CN207 PB level: 36.7 to 41.1 mV (–26.5 to –25.5 dB)
Adjustment Location: MAIN board
DECK B
attenuator
set
Pin 6 (L-CH) of IC1501 on the MAIN board.
Pin #¶ (R-CH) of IC1501 on the MAIN board.
1) 315 Hz
2) 10 kHz 50 mV (–23.8 dB)



Pin 2 (GND) of CN207 on the MAIN
board.
600 Ω
blank tape
CN-123
AF OSC
+
–
set
recorded
portion
CN207 (Pin
3 : L-CH)
(Pin
1 : R-CH)
level mete
r
DECK B
set
Pin 6 (L-CH) of IC1501 on the MAIN board.
Pin #¶ (R-CH) of IC1501 on the MAIN board.
315 Hz, 50 mV (–23.8 dB) blank tape
CS-123
Pin
2 (GND) of CN207 on the MAIN board.
600 Ω
attenuator
AF OSC
+
–
set
recorded
portion
CN207 (Pin
3 : L-CH)
(Pin
1 : R-CH)
level mete
r
Adjustment Location:
[MAIN BOARD] (Component Side)
[AUDIO BOARD] (Conductor Side)
* As the adjustment parts is mounted on the component side, ad-
just it through a hole in theAUDIO board form conductor side.
(Except RV431, 441)
CN207
CN205
RECORD
LEVEL
IC1501
RV1501
RV1551
31
RV651
RV311 L
RV411 R
RV652
(NORMAL) (HIGH)
TAPE SPEED
PB
LEVEL
– DECK A –– DECK B –
        



RECORD
BIAS CURRENT
RV341
RV441
RV301
RV401
L
RPB LEVEL
RL
  






– 20 –
CD SECTION
Note:
1. CD Block is basically designed to operate without adjustment. There-
fore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M impedance.
4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
Focus Bias check
Procedure:
1. Connect oscilloscope to test point TP (RF). (GND terminal:
VC)
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that the shape “≈” can be clearly distinguished at the
center of the waveform and check the RF signal level.
• RF signal
BD board
TP (FEO)
TP (VC) +
–
oscilloscope
S Curve Check
Procedure:
1. Connect oscilloscope to test point TP (FEO).
2. Connect between test point TP (FOK) and GND by lead wire.
3. Turn 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
between A and B. And confirm peak to peak level 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 of A : B
or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the brightness to
obtain best waveform.
RF Level Check
Procedure:
1. Connect oscilloscope to test point TP (TEO) 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
signal level is correct or not.
• SF signal
Note: Clear RF signal waveform means that the shape “≈”can be clearly
distinguished at the center of the waveform.
VOLT/DIV: 200 m
V
TIME/DIV: 500 ns
level:
1.3
± 0.3 Vp-p
BD board
TP (FEO)
TP (VC) +
–
oscilloscope
S-curve waveform
BD board
TP (RF)
TP (VC) +
–
oscilloscope
A
B
symmetry
within 3
± 1 Vp-p
VOLT/DIV: 200 m
V
TIME/DIV: 500 ns
level:
1.3
± 0.3 Vp-p