Sony HCD-DX8 User manual

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

2
Tape player section
Recording system 4-track 2-channel stereo
Frequency response 40 – 13,000 Hz (±3 dB),
( OLBY NR OFF) using Sony TYPE I
cassette
40 – 14,000 Hz (±3 dB),
using Sony TYPE II
cassette
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 – 108.0 MHz
Antenna FM lead antenna
Antenna terminals 75 ohm unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range
Middle Eastern models: 531 – 1,602 kHz
(with the interval set at 9
kHz)
Other models: 531 – 1,602 kHz
(with the interval set at 9
kHz)
530 – 1,710 kHz
(with the interval set at 10
kHz)
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz
General
Power requirements
Australian models: 230 - 240 V AC, 50/60 Hz
Mexican models: 120 V AC, 60 Hz
Other models: 120 V, 220 V or 230 - 240
V AC, 50/60 Hz
Adjustable with voltage
selector
Power consumption 250 watts
imensions (w/h/d) Approx. 280 x 360 x 425
mm
Mass : Approx. 9.5 kg
esign and specifications are subject to change
without notice.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED
LINE WITH MARK 0ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.

3
Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.
CAUTION
Use of controls or adjustments or performance of procedures
otherthanthosespecifiedherein may result in hazardous radiation
exposure.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of soldering iron around 270˚C
during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
MODEL IDENTIFICATION
— BACK PANEL —
TABLE OF CONTENTS
1. SERVICE NOTE ······························································· 4
2. GENERAL ·········································································· 5
3. DISASSEMBLY ································································ 7
4. TEST MODE···································································· 12
5. MECHANICAL ADJUSTMENTS ····························· 16
6. ELECTRICAL ADJUSTMENTS ······························· 16
7. DIAGRAMS
7-1. Circuit Boards Location ··················································· 21
7-2. Block Diagrams ································································ 22
7-3. Printed Wiring Board – BD Section – ····························· 24
7-4. Schematic Diagram – BD Section –································ 25
7-5. Printed Wiring Board – MAIN Section – ························ 26
7-6. Schematic Diagram – MAIN (1/3) Section – ·················· 27
7-7. Schematic Diagram – MAIN (2/3) Section – ·················· 28
7-8. Schematic Diagram – MAIN (3/3) Section – ·················· 29
7-9. Printed Wiring Board – POWER AMP Section – ··········· 30
7-10. Schematic Diagram – POWER AMP Section – ·············· 31
7-11. Printed Wiring Boards – PANEL Section –····················· 32
7-12. Schematic Diagram – PANEL Section –························· 33
7-13. Printed Wiring Boards – LEAF SW Section – ················ 34
7-14. Schematic Diagram – LEAF SW Section – ···················· 35
7-15. Printed Wiring Boards – DRIVER Section – ··················36
7-16. Schematic Diagram – DRIVER Section – ······················ 37
7-17. Printed Wiring Board – TRANS Section –······················ 38
7-18. Schematic Diagram – TRANS Section – ························ 39
7-19. IC Pin Function Description············································· 40
7-20. IC Block Diagrams ··························································· 42
8. EXPLODED VIEWS ······················································ 46
9. ELECTRICAL PARTS LIST ······································· 52
PART No.
• Abbreviation
AR : Argentine
AUS : Australian
E2 : 120 V AC Area in E model
E3 : 240 V AC Area in E model
MODEL
E2, E3, EA, MY, SP, AR models
MX, AUS models
PART No.
4-225-040-3s
4-225-040-4s
EA : Saudi Arabia
MY : Malaysia
MX : Mexican
SP : Singapore
This appliance is classified
as a CLASS 1 LASER
product. The CLASS 1
LASER PRO UCT
MARKING is located on
the rear exterior.

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

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

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

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

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

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

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

11
BASE UNIT
(BU-K2BD38)
DRIVER/MOTOR/SENSOR BOARDS
2four s crews
(PTPWH 2.6)
4 two insulators
4 two insulators
1 wire (flat type) (19 core) (CN101
)
3 Base unit
1c onnector (CN701)
2screw (BVTP2.6 × 8)
3 DRIVER board
q; screw (PTPWH2.6 × 8)
qs screw (BVTP 2.6 × 8)
qd SENSOR board
qa tray
4 Remove the two solderings of motor.
6
5
two screws (+BVTP 2.6 × 8)
7 wire (flat type) (8 core) (CN721
)
8 connector (CN722)
9MOTOR board

12
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 x, ENTER , and ?/1simulta-neously.
2. The fluorescent indicator tube displays “COLD RESET” and
the set is reset.
[CD Ship 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 ?/1button to turn the set ON.
2. Press CD button and ?/1button simultaneously.
3. After the "STANDBY" display blinks six times, a message
“LOCK” is displayed on the fluorescent indicator tube, and the
CD ship 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. Pressthreebuttons x, ENTER,and DISC 1 simultaneously.
2. The fluorescent indicator tube becomes blank instantaneously,
and the set is reset.
[CD Service Mode]
• This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the pickup.
Procedure:
1. Press ?/1button to turn the set ON.
2. Select the function “CD”.
3. Press three buttons x, ENTER , and OPEN/CLOSE simul-
taneously.
4. The CD service mode is selected.
5. With the CD in stop status, turn the shuttle knob clockwise to
move the pickup to outside track, or turn the shuttle knob
counter-clockwise to inside track.
6. 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.
[VACS ON/OFF Mode]
• This mode is used to switch ON and OFF the VACS (Variable
Attenuation Control System).
Procedure:
Press the ENTER and SPECTRUM buttons simultaneously. The
message “VACS OFF” or “VACS ON” appears.
[Change-over of AM Tuner Step between 9 kHz and
10 kHz]
• A step of MW channels can be changed over between 9 kHz
and 10 kHz.
Procedure:
1. Press ?/1button to turn the set ON.
2. Select the function “TUNER”, and press TUNER/BAND
button to select the BAND “AM”.
3. Press ?/1button to turn the set OFF.
4. Press ENTER and ?/1buttons simultaneously,andthedisplay
of fluorescent indicator tube changes to “AM 9 k STEP” or
“AM 10 k STEP”, and thus the channel step is changed over.
[GCTest Mode]
• This mode is used to check the software version, FL tube, LED,
keyboard and VACS.
Procedure:
1. Press three buttons x, ENTER ,and DISC 2 simultaneously.
2. LEDs and fluorescent indicator tube are all turned on.
3. When you want to enter the software version display mode,
press DISC 1 . The model number and destination are displayed.
4. Each time DISC 1 is pressed, the display changes starting
from MC version, GC version, CD version, CM version, ST
version,TC version, TA version,TM version and BR version in
this order, and returns to the model number and destination
display.
5. When DISC 3 is pressed while the version numbers are being
displayed except model number and destination, year, month
and day of the software creation appear. When DISC 3 is
pressedagain,thedisplayreturnstothe softwareversiondisplay.
When DISC 1 is pressed while year, month and day of the
software creation are being displayed, the year, month and day
of creation of the software versions are displayed in the same
order of version display.
6. Press DISC 2 button, and the key check mode is activated.
7. In the key check mode, the fluorescent indicator tube displays
“KEY0VOL0”. Each time a button is pressed, “KEY” value
increases. However, once a button is pressed, it is no longer
taken into account.
“VOL” value increases like 1, 2, 3 ... if rotating VOLUME
knob in “+” direction, or it decreases like 0, 9, 8 ... if rotating in
“–” direction.
8. Also when DISC 3 is pressed after lighting of all LEDs and FL
tubes, value of VACS appears.
9. To exit from this mode, press three buttons in the same manner
as step 1, or disconnect the power cord.

13
[MCTest Mode]
• This mode is used to check operations of the respective sections
of Amplifier, Tuner, CD and Tape.
Procedure:
1. Press the ?/1button to turn on the set.
2. Press the three buttons of x, ENTER and DISC 3
simultaneously.
3. A message “TEST MODE” appears on the FL display tube.
4 When f(CURSOR UP) button is pressed, GEQ increases to
its maximum and a message “GEQ ALL MA” appears.
5. When F(CURSOR DOWN) buttonispressed,GEQdecreases
to its minimum and a message “GEQ ALL M1” appears.
6. When g(CURSOR LEFT) or G(CURSOR RIGHT) button
is pressed, GEQ is set to flat and a message “GEQ FLAT”
appears.
7. When the VOLUME control knob is turned clockwise even
slightly, the sound volume increases to its maximum and a
message “VOLUME MAX” appears for two seconds, then the
display returns to the original display.
8. When theVOLUME control knob is turned counter-clockwise
even slightly, the sound volume decreases to its minimum and
a message “VOLUME MIN” appears for two seconds, then
the display returns to the original display.
9. In the test mode, the default-preset channel is called even when
the TUNER is selected and an attempt is made to call the preset
channelthathasbeenstoredinmemory, by operating the Shuttle
knob. (It means that the memory is cleared.)
10. When CD is selected and the EDIT button is pressed, the disc
that is being chucked at this moment becomes the default
setting. It means that the default disc only is accessed when
any other discs are selected even though the display indication
changes accordingly. At the same time, the DISC SKIP EX-
CHANGE and OPEN/CLOSE cannot be accepted. (It means
that the tray motor and the turntable motor are disabled of their
operation.)
11. When a tape is inserted in Deck B and recording is started, the
input source function selects VIDEO automatically.
12. When xbutton is pressed to stop recording, the Tape (Deck)
B is selected and tape is rewound using the Shuttle knob, tape
is rewound, tape is stops at around the record-starting position
and playback of the recorded portion of the tape is started. If
PAUSE is inserted even once during recording, tape is rewound
to the position around the PAUSE position and is played back.
13. When the CD SYNC HI-DUB Button ispress during playback
of Deck B, either normal speed or high speed can be selected
by this button.
14. Select the desired loop by pressing the PLAY MODE button.
Insert a test tapeAMS-110A or AMS-RO to DeckA.
15. Press the SPECTRUM button to enter theAMS test mode.
16. After a tape is rewound first, the FF AMS is checked, and the
mechanism is shut off after detecting the AMS signal twice.
17. Then the REWAMS is checked and the mechanism is shut off
after detecting the AMS signal twice.
18. When the check is complete, a message of either OK or NG
appears.
19. When you want to exit this mode, press the ?/1button twice.
The cold reset is enforced at the same time.

14
[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 and display status.
• If no error occurs:
The aging operation continues repeatedly.
1. Operating method of Aging Mode
Turn on the main power and select “CD” of the function.
1) Set a disc in DISC1 tray. Select CONTINUE ALL DISCS (press the PLAY MODE button), and REPEAT OFF (press the REPEAT
button).
2) Load the tapes recording use into the decksA and B respectively.
3) Press three buttons x, ENTER , and
DISC SKIP/EX-CHANGE simultaneously.
4) Aging operations of CD and tape are started at the same time.
5) To exit the aging mode, perform [MC Cold Reset].
3. Aging Mode in CD section
1) Display state
• No error occurs
Note:
[*][*][*][*] : Number of aging operations
Error display
E** s## $$ %%
12 3 4 5
• When the buttons x , ENTER and DISC 1 are pressed simultaneously, number of time of the mechanism error and the NO DISC error
can be checked.
Display: EMC**EDC** **: Number of times of error (Maximum three times)
EMC: Mechanism error
EDC: NO DISC error
• When aging operation is complete, be sure to perform the MC Cold Reset to reset the error history.
AGING[*][*][*][*]
Display
D: No disc error
01: FOCUS ERROR
02: GFS ERROR
03: SETUP ERROR
01: NO DISC judgment without chucking retry
02: NO DISC judgment after chucking retry
Status at the time of NO DISC judgment
(High order digits only)
1: STOP
2: SETUP
3: TOC READ
4: ACCESS
5: PLAY BACK
6: PAUSE
7: MANUAL SEARCH (PLAY)
8: MANUAL SEARCH (PAUSE)
1**
2s
3##
4$$
5%%
M: Mechanism error
Don’t care
High order digits only
D: Stopped during closing due to problems other than mechanism.
E: Stopped during opening due to problems other than mechanism.
C: Stopped during chucking due to problems other than mechanism.
F: Stopped during EX-opening due to problems other than mechanism.
Emergency related errors (High order digits only)
1: Stopped during chuck-up
2: Stopped during chuck-down
3: Time out by EX-OPEN
5: Time out by EX-CLOSE
The error No. 00 indicates the newest error. As the error No. increases, it means the older error.
When you want to retrieve the error history, press the PLAY MODE button in the case of mechanism error.
Or press the REPEAT button in the case of NO DISC error.

15
2) Operation during aging mode
In the aging mode, the program is executed in the following
sequence.
(1) The disc tray opens and closes.
(2) The mechanism accesses DISC 2 and makes an attempt to
read TOC. However, since there are no discs, a message
“CD2 NO DISC” appears.
(3) The mechanism accesses DISC 3 and a message “CD3 NO
DISC” appears.
(4) The disc tray turns to select a disc1.
(5) A disc is chucked.
(6) TOC of disc is read.
(7) The pickup accesses to the track 1, and playing 2 seconds.
(8) The pickup accesses to the last track, and playing 2 seconds.
(9) Every time when an aging operation of step 1 to step 8 is
complete, the display “AGING[*][*][*][*]” value increases
as the number of aging operations is counted up.
(10) Returns to step 1.
3. Aging Mode in Tape Deck section
1) Display state
• No error occurs
Display action now
• Error occurred
Display action last time
2) Operation during aging mode
In the aging mode, the program is executed in the following
sequence.
(1) Rewind is executed up to the top of tapeA and B.
(2) A tape on FWD side is played for 2 minutes.
(3) FF is executed up to either made for 20 second or the end of
tape.
(4) A tape is reversed, and the tape on REV side is played for 2
minutes.
(5) Rewind is executed up to the top of tape.
(6) Returns to step 2, and repeat steps from 2 to 5.
[Function Change Mode]
* Select either VIDEO or MD of the external FUNCTION input.
Procedure:
1. Turn on the power.
2. Press the two buttons ENTER and ?/1at the same time.
The main power is turned on and the other function of the
previous function is selected and displayed. “MD” or
“VIDEO”.
NO. Display action Action contents Final timing
1 TAPE A AG-1 Rewind the TAPE A, B The top of tape
2 TAPE A AG-2 FWD play the TAPE A 2 minutes playing
3 TAPE A AG-3 F.F. the TAPE A 20 second FF or the end
of tape
4 TAPE A AG-4 REV play the TAPE A 2 minutes playing
5 TAPE A AG-5 Rewind the TAPE A The top of tape
6 TAPE B AG-2 FWD play the TAPE B 2 minutes playing
7 TAPE B AG-3 F.F. the TAPE B 20 second FF or the end
of tape
8 TAPE B AG-4 REV play the TAPE B 2 minutes playing
9 TAPE B AG-5 Rewind the TAPE B The top of tape

16
SECTION 5
MECHANICAL ADJUSTMENTS SECTION 6 ELECTRICAL ADJUSTMENTS
0 dB=0.775 V
DECK SECTION
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts 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 adjustment
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 otherwise
specified.
• Test Tape
Record/Playback Head Azimuth Adjustment
Tape Signal Used for
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
WS-48B 3 kHz, 0 dB Tape Speed Adjustment
P-4-L300 315 Hz, 0 dB Level Adjustment
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads pinch rollers
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head
demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
set
MAIN board
CN301
Pin 3(L-CH)
Pin 1(R-CH)
MAIN board
CN301
Pin 2(GND)
+
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
3.06 N •m to 6.96 N •m
31 to 71 g •cm
(0.43 –0.98 oz •inch)
0.19 N •m to 0.58 N •m
2 to 6 g •cm
(0.02 –0.08 oz •inch)
3.06 N •m to 6.96 N •m
31 to 71 g •cm
(0.43 –0.98 oz •inch)
0.19 N •m to 0.58 N •m
2 to 6 g •cm
(0.02 –0.08 oz •inch)
6.96 N •m to 14.02 N •m
71 to 143 g •cm
(0.98 –1.99 oz •inch)
9.80 N •m
100 g or more
(3.53 oz or more)
9.80 N •m
100 g or more
(3.53 oz or more)
Mode Torque meter
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Meter reading
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension

17
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
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
Tape Speed Adjustment DECK B
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
CD SYNC HI-DUB button.
Procedure:
1. Turn the power switch on.
2. Press the xbutton, ENTER button and DISC 3 button
simultaneously.
(The “TEST MODE”on the fluorescent indicator tube display
while in the test mode.)
To exit from the test mode, press the ?/1button.
Mode: Playback
1. Insert the WS-48B into the deck B.
2. Press the gG button on the deck B.
3. Press the CD SYNC HI-DUB button in playback mode.
Then at HIGH speed mode.
4. Adjust RV1001 on the LEAF SW board so that frequency
counter reads 6,000 ± 30 Hz.
5. Press the CD SYNC HI-DUB button.
Then back to NORMAL speed mode.
6. Adjust RV1002 on the LEAF SW board so that frequency
counter reads 3,000 ± 15 Hz.
Adjustment Location: LEAF SW board
Playback level Adjustment DECK A DECK B
Procedure:
Mode: Playback
Deck A is RV302 (L-CH) and RV352 (R-CH), Deck B is RV303
(L-CH) and RV353 (R-CH) so that adjustment within adjustment
level as follows.
Adjustment Level:
CN301 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: MAIN board
Sample Volue of Wow and Flutter: 0.3% or less W. RMS
(WS-48B)
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
MAIN
board
CN301
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
+
–
set
test tape
WS-48B
(3 kHz, 0 dB)
MAIN board
CN301 (Pin 3: L-CH)
(Pin 1: R-CH)
frequency counter
+
–
set
test tape
P-4-L300
(315 Hz, 0 dB)
MAIN board
CN301 (Pin 3: L-CH)
(Pin 1: R-CH)
level meter
forward
reverse

18
4. Mode: Record
5. Mode: Playback
6. Confirm playback the signal recorded in step 3 become
adjustable level as follows.
If these levels do not adjustable level, adjustment the RV301
(L-CH) and RV351 (R-CH) on the MAIN board to repeat steps
4 and 5.
Adjustable level:
CN301 PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
[MAIN BOARD] (Component Side)
[LEAF SW BOARD]
(Conductor Side)
REC Bias Adjustment DECK B
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This “REC memory mode”is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to VIDEO.
(If do not operation of stopped from recording complete, and rotate
of shuttle knob then rewind to recording start position.)
1. Press MD (VIDEO) button to selectVIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
3. After press REC PAUSE/START button, press REC PAUSE/
START button, then recording start.
4. Mode: Record
5. Mode: Playback
6. Confirm playback the signal recorded in step 3 become
adjustable level as follows.
If these levels do not adjustable level, adjustment the RV304
(L-CH) and RV354 (R-CH) on the MAIN board to repeat steps
4 and 5.
Adjustable level: Playback output of 315 Hz to playback output
of 10 kHz: ±1.0 dB
Adjustment Location: MAIN board
REC Level Adjustment DECK B
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This “REC memory mode”is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to VIDEO.
(If do not operation of stopped from recording complete, and rotate
of shuttle knob then rewind to recording start position.)
1. Press MD (VIDEO) button to selectVIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
3. After press REC PAUSE/START button, press REC PAUSE/
START button, then recording start.
attenuator
set
MD/VIDEO (AUDIO) IN
1) 315 Hz
2) 10 kHz 50 mV (–23.8 dB)



600 Ω
blank tap
e
CN-123
AF OSC
+
–
set
recorded
portion
CN301 (Pin 3: L-CH)
(
Pin 1: R-CH
)
level mete
r
set
MD/VIDEO (AUDIO) IN
315 Hz, 50 mV (–23.8 dB)
blank tape
CS-123
600 Ω
attenuator
AF OSC
+
–
set
recorded
portion
CN301 (Pin 3: L-CH)
(
Pin 1: R-CH
)
level mete
r
RV351
RV354
RV304
RV303
RV352
RV302
RV353
RV301
CN301
13
REC LEVEL (L)
PB LEVEL (L)
(B)
PB LEVEL (L)
(A)
PB LEVEL (R)
(A)
PB LEVEL (R)
REC BIAS (R)
REC BIAS (L)
REC LEVEL (R)
TAPE SPEED
(HIGH)
TAPE SPEED
(NORMAL)
RV1001
RV1002

19
FMTuned Level Adjustment
Procedure:
1. Supply a 28 dB 98 MHz signal from theANTENNA terminal.
2. Tune the set to 98 MHz.
3. Adjust RV611 to the point (moment) when the TUNED
indicator on the flourescent indicator tube will change from
going off to going on.
Adjustment Location: MAIN board
Null Adjustment
Procedure:
1. Supply a 60 dB 98 MHz signal from theANTENNA terminal.
2. Tune the set to 98 MHz.
3. Measure voltage between pin wa of IC 601. Adjust T601 until
the voltage becomes 0 V.
Adjustment Location: MAIN board
[MAIN BOARD] (Component side)
FM RF SSG
75 Ωcoaxial
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 28 dB (at 75 W open)
FM ANTENNA terminal
(TM601)
set
FM RF SSG
75 Ωcoaxial
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 60 dB (at 75 W open)
FM ANTENNA terminal
(TM601)
set
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 object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
S-Curve Check
Procedure :
1. Connect oscilloscope to TP (FEO).
2. Connect between TP (FEI) and TP (VC) by lead wire.
3. Connect between TP (AGCCON) and TP (GND) by lead wire.
4. Turn Power switch on.
5. Load a disc (YEDS-18) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
6. Confirm that the oscilloscope waveform (S-curve) is
symmetrical betweenA and B.And confirm peak to peak level
within 4 ±1 Vp-p.
7. After check, remove the lead wire connected in step 2 and 3.
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 TP (RF).
2. Connect between TP (AGCCON) and TP (GND) by lead wire.
3. Turned Power switch on.
4. Load a disc (YEDS-18) and playback.
5. ConfirmthatoscilloscopewaveformisclearandcheckRFsignal
level is correct or not.
6. After check, remove the lead wire connected in step 2.
BD board
oscilloscope
TP(FEO)
TP(VC)
symmetry
S-curve waveform
within 4 ±1Vp-p
A
B
TP(RF)
TP(VC)
BD board
oscilloscope
T601
RV611
NULL
FM TUNED LEVEL

20
Note: Clear RF signal waveform means that the shape “◊”can be
clearly distinguished at the center of the waveform.
RF signal waveform
E-F Balance (1Track Jump) Check
Procedure:
1. Connect oscilloscope to TP (TEO) and TP (VC) board.
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback the number five track.
4. Press the hH button. (Becomes the 1 track jump mode.)
5. Confirmthatthelevel B andA (DC voltage)ontheoscilloscope
waveform.
1 track jump waveform
Specification level: x100=less than ±22%
6. After check, remove the lead wire connected in step 1.
RF PLL Free-run Frequency Check
Procedure :
1. Connect frequencycountertotestpoint(XPCK)with lead wire.
2. Turned Power switch on.
3. Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MHz.
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.45 ±0.3Vp-p
oscilloscope
BD board
TP (TEO)
TP (VC)
+
–
0V
Center of
waveform
B
Symmetry
A (DC voltage)
level=1.3±0.6Vp-p
A
B
+
–
frequency counte
r
BD board
TP (XPCK)
Adjustment Location:
[BD BOARD] (Conductor side)
TP (VC)
TP (RF)
TP (TEO)
TP (FEO)
TP (FEI)
TP (AGCCON)
TP (XPCK)
IC101
IC103