Sony HCD-MC3AV User manual

HCD-MC3AV
US Model
Canadian Model
Australian Model
SERVICE MANUAL
MINI HI-FI COMPONENT SYSTEM
MICROFILM
ManufacturedunderlicensefromDolbyLaboratories
Licensing Corporation.
“DOLBY” and the double-D symbol aand “PRO
LOGIC” are trademarks of Dolby Laboratories
Licensing Corporation.
• HCD-MC3AV is the tuner, deck,
CD and amplifier section in MHC-MC3AV.
— Continued on next page —
SPECIFICATIONS
Model Name Using Similar Mechanism HCD-F150/FR10
CD Mechanism Type CDM-46B1
Optical Pick-up Name KSS-213BA/F-NP
Model Name Using Similar Mechanism HCD-DR8AV
Tape Transport Mechanism Type TCM-230AWR2/230PWR2
CD
Section
Tape deck
Section
Amplifier section
U.S.A models:
AUDIO POWER SPECIFICATIONS
POWER OUTPUTAND TOTAL HARMONIC DISTORTION:
With 8 Ωloads both channels driven, from 70 – 20,000 Hz; rated 80 W per
channel minimum RMS power, with no more than 0.9% total harmonic
distortion from 250 mW to read output.
North American model:
Front Speaker:
Continuous RMS power output
80 + 80 W
(8 Ωat 1 kHz, 10% THD)
Total harmonic distortion
less than 0.09%
(8 Ωat 1 kHz, 40 W)
Center Speaker:
Continuous RMS power output
20 W
(8 Ωat 1 kHz. 1% THD)
Rear Speaker:
Continuous RMS power output
10 + 10 W
(16 Ωat 1 kHz, 1% THD)
Australian model:
The following measured at AC 240 V, 60 Hz;
Front Speaker:
DIN power output (Rated)
70 + 70 W
(8 Ωat 1 kHz, DIN)
Continuous RMS power output (Reference)
80 + 80 W
(8 Ωat 1 kHz, 10% THD)
Center Speaker:
DIN power output (Rated)
17.5 W
(8 Ωat 1 kHz, DIN)
Continuous RMS power output (Reference)
20 W
(8 Ωat 1 kHz, 10% THD)
Rear Speaker:
DIN power output (Rated)
8 + 8 W
(8 Ωat 1 kHz, DIN)
Continuous RMS power output (Reference)
10 + 10 W
(8 Ωat 1 kHz, 10% THD)

— 2 —
The following measured atAC 220V, 60 Hz;
Front Speaker:
DIN power output (Rated) 60 + 60 W
(8 Ωat 1 kHz, DIN)
Continuous RMS power output (Reference)
70 + 70 W
(8 Ωat 1 kHz, 10% THD)
Center Speaker:
DIN power output (Rated) 15 W
(8 Ωat 1 kHz, DIN)
Continuous RMS power output (Reference)
17.5 watts
(8 Ωat 1 kHz, 10% THD)
Rear Speaker:
DIN power output (Rated) 7 + 7 W
(8 Ωat 1 kHz, DIN)
Continuous RMS power output (Reference)
8.5 + 8.5 W
(8 Ωat 1 kHz, 10% THD)
Inputs
VIDEO/MD IN (phono jack): voltage 250 mV/450 mV,
impedance 47 kΩ
Outputs
VIDEO/MD OUT (phono jack):voltage 250 mV,
impedance 1 kΩ
PHONES (stereo phone jacks): accepts headphones of 8 W or more
SPEAKER: accepts impedance of 8 to 16 Ω
REAR SPEAKER: accepts impedance of 16 Ω
CENTER SPEAKER: accepts impedance of 8 Ω
SUPER WOOFER: voltage 1V, impedance 1 kΩ
CD player section
System Compact disc and digital audio system
Laser Semiconductor laser (λ=780 mm)
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.
Frequency response 2 Hz – 20 kHz (± 0.5 dB)
Wavelength 780 – 790 nm
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB
CD OPTICAL DIGITAL OUT
(Square optical connector jack, rear panel)
Wave length 600 nm
Output level –18 dBm
Tape player section
Recording system 4-track 2-channel stereo
Frequency response (DOLBY NR OFF)
40 – 13,000 Hz (± 3 dB),
using Sony TYPE I
cassette
40 – 14,000 Hz (± 3 dB),
using Sony TYPE II
cassette
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 – 108.0 MHz
Antenna FM lead antenna
Antenna terminals 75 W unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range 530 – 1,710 kHz
(with the interval set at 10 kHz)
531 – 1,710 kHz
(with the interval set at 9 kHz)
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz
General
Power requirements
NorthAmerican model: 120 V AC, 60 Hz
Australian model: 220 - 240 V AC, 50/60 Hz
Power consumption
U.S.A models: 250 W
Canadian models: 250 VA
Australian models: 250 W
Dimensions (w/h/d) Approx. 280 ×373 ×437 mm
(111/8×143/4×171/4in)
Mass Approx. 12 kg (26 lbs. 7 oz)
Supplied accessories: AM loop antenna (1)
Remote RM-SF250AV (1)
Batteries (2)
FM lead antenna (1)
Speaker cords (5)
Front speaker pads (8)
Center speaker pads (4)
Design and specifications are subject to change without notice.
For customers in Canada
(For MHC-MC3AV)
Use only the supplied SS-SR50 rear surround speaker for connection to the REAR
SPEAKER connector, the supplied SS-CN50 center surround speaker for connection
to the CENTER SPEAKER connector on the MHC-MC3AV.

SAFETY-RELATED COMPONENTWARNING!!
COMPONENTS IDENTIFIED BY MARK !OR DOTTED LINEWITH
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.
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
CAUTION
Use of controls or adjustments or performance of procedures
otherthan those specifiedhereinmay result inhazardous radiation
exposure.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE !SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
SAFETY CHECK-OUT
(US model only)
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 microampers).
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)
Earth Ground
AC
voltmeter
(0.75V)
1.5k
Ω
0.15 µ F
Fig.A. Using an AC voltmeter to check AC leakage.
To Exposed Metal
Parts on Set
— 3 —

— 4 —
TABLE OF CONTENTS
1. GENERAL
FRONT PANEL ···································································· 5
REAR PANEL ······································································· 6
2. DISASSEMBLY ······························································· 8
3. TEST MODE ··································································· 16
4. MECHANICAL ADJUSTMENTS ···························· 18
5. ELECTRICAL ADJUSTMENTS
Deck Section ········································································ 21
CD Section ··········································································· 25
6. DIAGRAMS
6-1. Block Diagram CD Section ············································ 27
Block Diagram Main Section ·········································29
Block Diagram Audio Section········································ 31
6-2. Circuit Boards Location ··················································· 33
6-3. Printed Wiring Board BD Section ·································· 35
6-4. Schematic Diagram BD Section···································· 37
6-5. Printed Wiring Board CD Motor Section ······················· 39
6-6. Schematic Diagram CD Motor Section·························· 41
6-7. Printed Wiring Board Audio Section ······························ 43
6-8. Schematic Diagram Audio Section································· 45
6-9. Printed Wiring Board Leaf SW Section ························· 47
6-10. Schematic Diagram Leaf SW Section ···························· 49
6-11. Printed Wiring Board Main Section ······························· 51
6-12. Schematic Diagram Main (1/5) Section ························· 53
6-13. Schematic Diagram Main (2/5) Section ························· 55
6-14. Schematic Diagram Main (3/5) Section ························· 57
6-15. Schematic Diagram Main (4/5) Section ························· 59
6-16. Schematic Diagram Main (5/5) Section ························· 61
6-17. Printed Wiring Board Panel Section······························· 63
6-18. Schematic Diagram Panel Section ·································65
6-19. Printed Wiring Board Surround Amp Section ················67
6-20. Schematic Diagram Surround Amp Section··················· 69
6-21. Schematic Diagram Power Section ································ 71
6-22. Printed Wiring Board Power Section ·····························73
6-23. Waveforms ········································································ 75
6-24. IC Pin Function Description ············································· 76
6-25. IC Block Diagrams ··························································· 84
7. EXPLODEDVIEWS ····················································· 86
8. ELECTRICAL PARTS LIST ····································· 94
SERVICING NOTES
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-
upblock.Therefore,whenchecking thelaser diode emission,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 waveform is output repeatedly.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
Notes on chip component replacement
•Never reuse a disconnected chip component.
•Noticethat the minusside of atantalum capacitor maybe damaged
by heat.
Flexible Circuit Board Repairing
•Keep the temperature of the 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.

— 5 —
SECTION 1
GENERAL
FRONT PANEL
576980
!¡
!™
!£
!¢
!¶
!•
@º!ª
!∞
@¡
@™
!§
#§
2
3
4
#£
#™
#¡
#∞
1
#¢
@£
@¢@∞@ª @•#º @§@¶
#¶
11/u button
2DISPLAY/MEMO button
3CLOCK TIMER SET button
4TIMER SELECT button
5TAPE A ªbutton
6CD flbutton
7TAPE A ·button
8TAPE B ªbutton
9TUNER/BAND button
0TAPE B ·button
!¡ SUR button
!™ DBFB button
!£ FUNCTION button
!¢ CONTINUE/DIRECTION button
!∞ PROGRAM/DOLBY-NR button
!§ SHUFFLE/STEREO/MONO button
!¶ REPEAT/TUNER MEMORY button
!• GROOVE button
!ª LOOP button
@º FLASH button
@¡ CD PLUS ONE button
@™ GROUP ENTRY button
@£ Numeric buttons
@¢ PHONES jack
@∞ VOLUME Knob
@§ STOP button
@¶ INPUT, SCAN, SEARCH, CHECK,
CLEAR, DELETE buttons
@• + )+ button
@ª SELECTOR button
#º =0 – button
#¡ ENTER button
#™ FILE SELECT button
#£ PPAUSE button
#¢ rREC button
#∞ CD SYNCHRO button
#§ HI-SPEED DUBBING button
#¶ PRO LOGIC button

— 6 —
REAR PANEL
3
5
6
1
2
8
7
4
1VIDEO/MD (AUDIO) jack
2ANTENNA terminal
3AC power cord
4CENTER SPEAKER terminal
5REAR SPEAKER terminal
6FRONT SPEAKER terminal
7CD DIGITAL OUT connector
8SUPER WOOFER jack

— 7 —
This section is extracted
from instruction manual.

— 8 —
SECTION 2
DISASSEMBLY
•This set can be disassembled in the order shown below.
2-1. CASE
Note: Follow the disassembly procedure in the numerical order given.
Main board
(Page 10) Power transformer (T901) (Page 11)
CD mechanism
deck section
(Page 12)
Base
unit
(Page 12)
BD board,
sled motor
(M102)
(Page 13)
Optical
pick-up
(KSS-213BA/F-NP)
(Page 13)
Sub
chassis
(Page 11)
Tape mechanism
deck section
(Page 14)
Audio board
(Page 14)
Back panel
(Page 10)
Door assy
(Page 9)
Capstan motor (M1)
(Page 15)
Front panel
section
(Page 9)
Case
(Page 8)
1 Three screws
(CASE3 TP2)
1 Three screws
(CASE3 TP2
)
2 Three screws
(BVTP 3
× 8)
3 Case

— 9 —
2-2. FRONT PANEL SECTION
2-3. DOOR ASSY
2 Open the door ass'y
1 Two screws
(PTPWH 2.6
× 8)
A3
Remove the door ass'
y
to direction of the
arrow
A .
6 Screws
(BVTT 3
× 8)
7 Lug
2 Wire (flat type)
(17 core)
1 Wire (flat type)
(15 core)
9 Two claws
9 Two claws
8 Three screws
(BVTP 3
× 8)
3 Wire (flat type) (15 core)
4 Connector CN108
5 Connector CN454

— 10 —
2-4. BACK PANEL
2-5. MAIN BOARD
1 Wire (flat type) (13 core)
5 Thirteen screws
(BVTP 3
× 8)
3 Five screws
(BVTP 3
× 8)
4 Cover
6 Remove the back panel
to direction of the arrow.
2 Connector
7 Remove the MAI
N
board to direction
of the arrow.
6 Two screws
(BVTP 3
× 8)
2 Wire (flat type) (9 core)
1 Wire (flat type) (16 core)
4 Three connectors
3 Four connectors
5 Two connectors

— 11 —
2-6. POWER TRANSFORMER (T991)
2-7. SUB CHASSIS
3 Four screws
(BVTT 3
× 8)
4 Power transforme
1 Connector
2 Power cor
d
1 Two screws
(BVTT 3
× 8)
3 Sub chassis
2 Three screws
(BVTP 3
× 8)
2 Two screws
(BVTP 3
× 8
)

— 12 —
2-8. CD MECHANISM DECK SECTION
2-9. CD BASE UNIT
8 Three screws
(BVTT 3
× 10)
9 Base (LOADING)
3 Bwo screws
(BVTP 3
× 8)
4 Cover (CD)
!™ Base (CDM
)
!¡ Screw
(BVTT 3
× 10)
0 Screw
(BVTP 3
× 14)
5 Two screws
(BVTT 3
× 6)
7 Reinforcement
1 Screw
(PTPWH 2.6
× 8)
2 Table (SO)
6 Wire holder
1 Two screws
(BTVP 3
× 8)
2 Bracket
3 Two tention springs
5 Base unit
4 Four screws
(PTPWH 2.6
× 8)

— 13 —
2-10. BD BOARD, SLED MOTOR (M102)
2-11. OPTICAL PICK-UP (KSS-213BA/F-NP)
6 Gear (A) (S)
5 Claw
!º Two screws (+P 2 × 2)
!¡ Sled motor
(M102)
3 Removal
four solders.
2 Screw (+PTPWH 2 × 5)
4 BD board
1 Wire (flat type) (16 core
)
9 Gear (B) (RP)
7 Three claws
8 Gear cover
3 Remove the optical
pick-up to direction
of the arrow
A .
2 Sled shaft
1 Claw
A

— 14 —
2-12. TAPE MECHANISM DECK SECTION
2 Remove the cassette lid (L) ass'y
to direction of the arrow
B .
1 Remove the cassette lid (R) ass'y
to direction of the arrow
A .
A
B3
Three screws
(BVTP 2.6
× 8)
3 Three screws
(BVTP 3
× 6)
4 Remove the tape mechanism
deck section.
2-13. PANEL BOARD
!™ Six screws
(BVTP 2.6
× 8)
!™ Six screws
(BVTP 2.6
× 8)
8 VOL ring
7 VOL ring
6 VOL knob
!¡ JOG ring
0 JOG ring
9 JOG ring
!™ Seven screws
(BVTP 2.6
× 8)
3 Remove the
cassette lid (R) assy
3 Remove the
cassette lid (L) assy
TORSION SPRING
(DOOR2)
TORSION SPRING
(DOOR1)
4 Two screws
(BVTP 2.6
× 8)
5 Remove the
TC bracket
!£ Remove the panel boar
d
1
2
2
1

— 15 —
2-14. AUDIO BOARD
2-15. CAPSTAN MOTOR (M1)
4 AUDIO board
3 Two screws
(BTP 2.6
× 4)
2 Break the soldering of two
flexible flat cables.
1 Four rivets
3 Hang the belt.
1 Two screws
(BTP 2.6
× 8)
2 Hang the belt.
4 Removal the capstan motor
to direction of the arrow.

— 16 —
SECTION 3
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 the three buttons STOP , ENTER and FUNCTION at
the same time.
2. The fluorescent indicator tube turns off for a moment and the
RAM is reset to the initial conditions.
[MC Hot Reset]
* This mode resets the set with the preset data kept stored in the
memory. This hot reset mode is performed also when the power
cord is plugged in and out.
Procedure:
1. Press the three buttons STOP , ENTER and GROUP 1 at the
same time.
2. The fluorescent indicator tube turns off for a moment and the
RAM is reset to the initial conditions.
[CD Initial]
* The CD INITIAL clears all of the CD related data. Execute
this mode when returning the set to the customer.
Procedure:
1. Press the three buttons STOP , ENTER and GROUP 4 at the
same time.
2. The message “STANDBY” appears on the fluorescent indicator
tube and the CD related data is reset to the initial conditions.
[CD LineTest]
* The CD Line test displays the rotating time required for one
rotation by rotating the disc tray.
Procedure:
1. Press the three buttons STOP , ENTER and GROUP 5 at the
same time. The CD PLAY LED and the CD PAUSE LED flash
alternately and the disc tray starts rotation.
2. The message “xx << y.y” appears on the fluorescent indicator
tube. The left numbers count up the discs starting from 1 to 51.
The left numbers “y.y” indicate the rotating time required for
one rotation by rotating the disc tray.
3. To exit the CD LINE test mode, execute the MC Hot Reset.
[CD Memo All Clear]
* The mode clears all contents of the CD disc memo. Execute
this mode when returning the set to the customer.
Procedure:
1. Press the two buttons MEMO INPUT and FLASH at the
same time.
2. The message “ALL ERASE” appears on the fluorescent
indicator tube and the CD disc memo is all cleared.
[GCTest Mode]
* This mode checks microprocessor version number, keys,
fluorescent tubes, LEDs and VACS (Variable Attenuation
Control System).
Procedure:
1. Press the three buttons STOP , ENTER and GROUP 2 at the
same time. The HCD-MC3AV enters the GC test mode, and all
of the fluorescent tubes and LEDs turn on.
2. From this state, any one of the three modes GROUP 1, GROUP
2 and GROUP 3 can be selected. Go to step 3 to enter the
GROUP 1 test mode. Go to step 5 to enter the GROUP 2 test
mode. Go to step 11 to enter the GROUP 3 test mode.
3. [GROUP 1 test mode ] From the state of step 2, press the
GROUP 1 button. Every pressing of the GROUP 1 button
advances the following check modes and displays in the given
order. Model name display, destination display, MC version
display, GC version display, DC version display, VC version
display and CC version display.
4. To exit the GC test mode and to return to the STANDBY mode,
press the STOP , ENTER and GROUP 2 buttons again.
5. [GROUP 2 test mode ] You can enter this mode directly from
step 2. When you performed steps 3, perform steps 4, then 1
and 2 before starting the step 5.
[GROUP 2 test mode ] From the GC test mode, press the
GROUP 2 button to enter the key check mode.
The display: K 1, J 0, V 0 appears.
6. The value after K indicates the number of times that the key is
pressed. 1 is displayed because the GROUP 2 button has
already been pressed.
7. When other keys are pressed one after another, the key count
increases up to 43. The keys which have already been pressed,
are not counted.
8. The value after J indicates the number of clicks that the JOG
dial is rotated. The clockwise rotation increases the count value.
The counter-clockwise rotation decreases the count value.
9. The value after V also indicates amount of rotation of volume
control. The clockwise rotation increases the count value. The
counter-clockwise rotation decreases the count value.
10. To exit the GC test mode and to return to the STANDBY mode,
press the STOP , ENTER and GROUP 2 buttons again.
11. [GROUP 3 test mode ] You can enter this mode directly from
step 2. When you performed steps 3, perform steps 4, then 1
and 2 before starting the step 5.
[GROUP 3 test mode ] From the GC test mode, press the
GROUP 3 button to enter the VACS attenuation check mode.
The display: VOL NORMAL appears.
12. To exit the GC test mode and to return to the STANDBY mode,
press the STOP , ENTER and GROUP 2 buttons again.
[MCTest Mode]
* This mode checks operation of amplifier and cassette deck.
How to enter the MC test mode:
Press the three buttons of STOP , ENTER and GROUP 3 . “EQ
CHECK” display on the FL tube and the VOLUME display flash.
In addition the LEDs of the JOG dial, FF and REW flash indicating
the MC test mode.
Check procedure:
You can perform any of the following five steps. However, it is
recommended to perform them in the following order because the
skipped cannot be performed if the checks are not performed in the
given order.
1. EQ Check Mode
The GEQ becomes maximum when the JOG dial is turned
clockwise.
The GEQ becomes minimum when the JOG dial is turned
counter-clockwise.
The GEQ comes to center when the FILE SELECT button is
pressed.

— 17 —
2. VOLUME Check Mode
The maximum volume is set, and theVOLUME MAX display
and the GEQ display are displayed for a moment regardless of
the amount of volume rotation.
The minimum volume is set, and the VOLUME MIN display
and the GEQ display are displayed for a moment regardless of
the amount of volume rotation.
3. Deck Check Mode
Installa tape to thedeck B. SelectTAPE B withthe FUNCTION
button.
Recording starts and PAUSE is released when the REC button
is pressed.
VIDEO is selected by the input FUNCTION.
Press the STOP button to stop recording and select TAPE B
with the FUNCTION button.
Rewind the tape by pressing the REW button and stop at the
recording start point. Start playback from the recording start
point.
4. High Speed Check Mode-1
Installa tape to thedeckA. SelectTAPEAwith the FUNCTION
button.
Press the PLAY button then press the HI-SPEED DUBBING
button during playback.
The normal playback is obtained during normal speed playback
and the double speed playback is obtained during the double
speed playback.
5. High Speed Check Mode-2
Installa tape to thedeck B. SelectTAPE B withthe FUNCTION
button.
Press the REC button. When the PAUSE is released , recording
is started.
When the HI-SPEED DUBBING button is pressed during
recording, the double speed recording is established only when
the button is pressed.
[Aging Mode]
The decks A and B are operated automatically for aging purpose.
When errors occur during aging, causes of errors are displayed and
the aging mode is stopped.
How to enter the aging mode
1. Turn on the main power. Install a playback tape to deck A and
install a blank tape to deck B.
2. Select TAPE A with the FUNCTION button.
3. Press the three buttons of STOP , ENTER and GROUP
ENTRY at the same time to enter the aging mode.
How to exit the aging mode.
Turn off the main power.
1. Rewind the tapesA and B. Tapes stop at the shut-off of tapeA
and the aging mode advances to the next step.
The message: TAPE A AG-1 appears.
2. The tapeA is played back in the FWD mode. After two minutes
of the FWD playback, the aging mode advances to the next
step.
The message: TAPE A AG-2 appears.
3. The tape A runs in fast forward. After two minutes of fast
forward, or at the shut-off point, the tape is stopped and the
aging mode advances to the next step.
The message: TAPE A AG-3 appears.
4. The tape A is played back in the RVS mode. After two minutes
of the RVS playback, the aging mode advances to the next step.
The message: TAPE A AG-4 appears.
5. The tape A is rewound and stops at the shut-off. The aging
mode advances to the next step.
The message: TAPE A AG-5 appears.
6. The tape B is played back in the FWD mode. After two minutes
of the FWD playback, the aging mode advances to the next
step.
The message: TAPE B AG-2 appears.
7. The tape B runs in fast forward. After two minutes of fast
forward, or at the shut-off point, the tape is stopped and the
aging mode advances to the next step.
The message: TAPE B AG-3 appears.
8. The tape B is played back in the RVS mode.After two minutes
of the RVS playback, the aging mode advances to the next step.
The message: TAPE B AG-4 appears.
9. The tape B is rewound and stops at the shut-off. The aging
mode advances to the next step.
The message: TAPE B AG-5 appears.
[Function Change Mode]
* Select either VIDEO or MD of the external FUNCTION input.
Procedure:
1. Turn off the power.
2. Press the two buttons ENTER and POWER at the same time.
The main power is turned on and the other function of the
previous function is selected and displayed. “MD” or “VIDEO”
[AMTUNER STEP 9 kHz/10 kHz Selection Mode]
* Either the 9 kHz step or 10 kHz step can be selected for theAM
channel step.
Procedure:
1. Turn on the power and select TUNER using the FUNCTION
button.
2. Select AM with the TUNER/BAND button and turn off the
power.
3. Press the two buttons FUNCTION and POWER at the same
time. The main power is turned on and the other frequency step
of the previous mode is selected and displayed. “AM 9 k STEP”
or “AM 10 k STEP”

— 18 —
SECTION 4
MECHANICAL ADJUSTMENT
•TAPE MECHANISM DECK SECTION •Torque Measurement
•CD MECHANISM DECK SECTION
To adjust the mechanism section, enter the mechanism section adjustment mode.
For how to enter the mechanism section adjustment mode, refer to each adjustment section.
DISC SENSOR ALIGNMENT
1. Make sure that there is no disc in the unit.
2. Connect an oscilloscope to IC401$™, IC4024of the MAIN board.
3. Turn the power switch on.
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.
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)
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
4. Press the pbutton, ENTER button and GROUP 5 button simultaneously.
oscilloscop
e
IC401 $™ D.SENS (CH1)
IC401
4 HHOUT (CH2)
GND

— 19 —
5. The disc table rotates in the clockwise direction. The disc table rotation time is displayed with ‘’PLUS ONE” slit as a measuring point.
6. Measure the waveform of the oscilloscope when the disc table is rotating.
7. Move the holder (sensor) center so that the flat portion center at the top of the D.SENS (CH1) input waveform and the ‘’H” center of
HHOUT (CH2) coincide.
8. Tighten the fixed screw to fix the disc table, then press the CLEAR button.
9. The disc table rotates in the counterclockwise direction. Measure the waveform and make sure that the flat portion center at the top of the
D.SENS (CH1) input waveform and the ‘’H” center of HHOUT (CH2) coincide.
10. If the adjustment is not successful, press the CLEAR button to rotate the disc table in the clockwise direction, and perform steps 6 to 9.
Note:During the adjustment mode, the rotational direction is switched each time the CLEAR button is pressed.
Pressing the CHECK button enters the loading mode which will be described later. Pressing the CLEAR button rotates the disc table
again.
PLUS ONE
HHOUT (CH2) waveform
D.SENS (CH1) waveform
Flat portion center of
D.SENS (CH1) waveform
Fixed screw
Holder (sensor)

— 20 —
MAGNET ASSY ALIGNMENT
1. Check that there is no disc in the unit and then turn ON the power. Open the door, and set a disc in the PLUS ONE slit.
2. Close the door, and while pressing the pbutton, ENTER button and GROUP 5 button simultaneously.
3. Press the CHECK button, and set the loading mode.
4. Press the + ‚± button and chuck the disc.
5. Adjust the magnet assembly and magnet holder so that A = B as shown in the figure.
DISC HOLDER A ALIGNMENT
1. Check that there is no disc in the unit and then turn ON the power. Open the door, and set a disc in the PLUS ONE slit.
2. Close the door, and while pressing the pbutton, ENTER button and GROUP 5 button simultaneously.
3. Press the CHECK button, and set the loading mode.
4. Press the + ‚± button and chuck the disc.
5. Press + ‚± or ≠º – button to stop the disc holder A slightly away from the disc.
6. Rotate and adjust the adjusting screw so that the center of the disc and that of the disc holder coincide.
AB
Magnet ASSY
Magnet holder
Magnet ASSY Screw (For adjustment
)
Disc
Disc holder A
Disc holder A Screw (For adjustment)
Disc
a = b
ab