Sony HCDDX-70 Service manual

HCD-DX70

SERVICE MANUAL

Ver 1.0 2001.02

HCD-DX70 is the tuner, deck, CD and amplifier
section in MHC-DX70.

Model Name Using Similar Mechanism NEW

CD

SECTION

TAPE DECK

SECTION

CD Mechanism Type CDM58E-30BD60

Base Unit Type BU-30BD60

Optical Pick-up Type A-MAX.3

Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type TCM-230AWR41/MWR41

E Model

SPECIFICATIONS

— Continued on next page —

9-929-580-11

2001B0900-1

© 2001.2

COMPACT DISC DECK RECEIVER

Sony Corporation

Audio Entertainment Group

General Engineering Dept.

HCD-DX70

TABLE OF CONTENTS

1. GENERAL ·········································································· 4

2. DISASSEMBLY

2-1. Case (Top) ·········································································· 5
2-2. Loading Panel ····································································· 6
2-3. Front Panel Section ···························································· 6
2-4. Tape Mechanism Deck ······················································· 7
2-5. CD SW Board, Panel Board, Pad Switch Board ················ 7
2-6. Main Trans Board ······························································· 8
2-7. Main Board, Power Board ·················································· 8
2-8. SW Board, Head (A) Board, Head (B) Board ···················· 9
2-9. Base Unit ············································································ 9
2-10. Driver Board, Motor Board, CD Sensor Board and

Video Board······································································ 10

3. TEST MODE ···································································· 11

4. MECHANICAL ADJUSTMENTS ····························· 15

5. ELECTRICAL ADJUSTMENTS ······························· 15

6. DIAGRAMS

6-1. Circuit Board Location ····················································· 21
6-2. Block Diagrams ································································ 22
6-3. Schematic Diagram – BD Section – ································· 24
6-4. Printed Wiring Board – BD Section – ······························ 25
6-5. Printed Wiring Board – Main Section – ··························· 26
6-6. Schematic Diagram – Main (1/4) Section – ····················· 27
6-7. Schematic Diagram – Main (2/4) Section – ····················· 28
6-8. Schematic Diagram – Main (3/4) Section – ····················· 29
6-9. Schematic Diagram – Main (4/4) Section – ····················· 30
6-10. Schematic Diagram – Video SW Section – ······················ 31
6-11. Printed Wiring Board – Video SW Section – ··················· 31
6-12. Printed Wiring Board – Power AMP Section – ················ 32
6-13. Schematic Diagram – Power AMP Section – ··················· 33
6-14. Printed Wiring Board – Panel Section – ··························· 34
6-15. Schematic Diagram – Panel Section – ····························· 35
6-16. Printed Wiring Boards – Switch Section – ······················· 36
6-17. Schematic Diagram – Switch Section – ··························· 37
6-18. Printed Wiring Boards – Leaf SW Section – ···················· 38
6-19. Schematic Diagram – Leaf SW Section – ························ 39
6-20. Printed Wiring Boards – Driver Section – ························ 40
6-21. Schematic Diagrams – Driver Section – ·························· 41
6-22. Printed Wiring Board – Trans Section –··························· 42
6-23. Schematic Diagram – Trans Section – ····························· 43
6-24. IC Pin Functions ······························································· 44
6-25. IC Block Diagrams ··························································· 48

7. EXPLODED VIEWS

7-1. Main Section ····································································· 51
7-2. Front Panel Section ·························································· 52
7-3. Chassis Section ································································· 53
7-4. Tape Mechanism Section-1 (TCM-230MWR41) ············· 54
7-5. Tape Mechanism Section-2 (TCM-230AWR41) ·············· 55
7-6. CD Mechanism Deck Section (CDM58E-30BD60) ········ 56
7-7. Base Unit Section (BU-30BD60) ····································· 57

8. ELECTRICAL PARTS LIST ······································· 58

2

HCD-DX70

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 pick­up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.

Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.

SETTING THE TIME

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
other than those specified herein 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.

MODEL IDENTIFICATION

— BACK PANEL —

PARTS No.

This section is extracted
from instruction manual.

MODEL

E, E51, AR, SP models

MX model

• Abbreviation
AR : Argentina model
SP : Singapore model
MX : Mexican model
E51 : Chiri and Peru model

PARTS No.

4-231-580-1s

4-231-580-3s

3

HCD-DX70

Front Panel

SECTION 1

GENERAL

1 2 3 4 56

qh

qg

qf

qd

7
9

qa

qs

8
q;

el

ej

ra
r;

ek

qj qk ql w;wa ws

wd
wf
wg

eheg ed es e; wk wh

wjef ea wl

Location of Parts and Controls

1 @/1 (POWER) button and indicator
2 DISC 1 button and indicator
3 DISC 2 button and indicator
4 DISC 3 button and indicator
5 DISC SKIP EX-CHANGE button
6 CD (OPEN) button
7 CD button and indicator
8 TUNER/BAND button and indicator
9 TAPE A/B button and indicator
q; MD (VIDEO) button and indicator
qa VOLUME knob
qs PHONES jack
qd MIC jack
qf MIC LEVEL knob
qg GAME INPUT (VIDEO, AUDIO L/R) jack
qh GAME button and indicator
qj DISPLAY button
qk SPECTRUM button
ql EDIT (DIRECTION) button
w; REPEAT (FM MODE/DOLBY NR) button
wa PLAY MODE (TUNER MEMORY) button

ws Remote sensor
wd MOVIE EQ button
wf ENTER button and indicator
wg P FILE button
wh M/+ button
wj REC PAUSE/START button and indicator
wk > button
wl CD SYNC HI-DUB button
e; X button
ea SURROUND button
es bB button
ed x button
ef GROOVE button
eg . button
eh m/– button
ej b/v/B/V button
ek GAME EQ button
el KARAOKE PON button
r; EFFECT ON/OFF button
ra MUSIC EQ button

4

SECTION 2

DISASSEMBLY

• The equipment can be removed using the following procedure.

Set Case (Top) Loading Panel Front Panel Section

HCD-DX70

Tape Mechanism Deck

Head (A) Board, Head (B) Board And SW Board

CD SW Board, Panel Board And PAD Switch Board

Main Trans Board

Main Board And Power Board

Base Unit

Driver Board, Motor Board, CD Sensor Board And Video Board

Note : Follow the disassembly procedure in the numerical order given.

2-1. CASE (TOP)

qs

qd

case (top)

two claws

6

two screws (case 3 TP2)

8

two screws

(+BVTP 3

×

10)

qa

two screws (+BVTP 3

two claws

×

12)

0

7

screw (case 3 TP2)

side panel (L)

9

5

4

2

screw (case 3 TP2)

side panel (R)

3

two screws

(+BVTP 3

1

two screws (case 3 TP2)

×

10)

5

HCD-DX70

2-2. LOADING PANEL

CD mechanism deck (CDM58)

1

Turn the pulley to the direction of arrow.

Front panel side

4

Pull-out the disc tray.

pulley

2-3. FRONT PANEL SECTION

qg

CD mechanism deck (CDM58)

2

Pull-out the disc tray.

4

connector

(CN607)

3

0

connector

(CN781)

qd

screw (+BVTP 3

×

10)

6

screw

(+BVTP 3

×

10)

8

qf

5

screw

(+BVTP 3

9

1

flat type wire (CN304)

×

10)
lead wire

qj

screw

(+BVTP 3

×

10)

2

connector (CN1)

3

connector (CN2)

front panel section

lead wire

connector
(CN601)

qh

screw (+BVTP 3

qa

flat type wire

(CN201)

qs

connector

(CN202)

×

10)

7

three screws (+BVTT 3

×

8)

6

2-4. TAPE MECHANISM DECK

1

five screws (+BVTP 2.6

2

Tape mechanism deck

HCD-DX70

×

8)

2-5. CD SW BOARD, PANEL BOARD, PAD SWITCH BOARD

2

four claws

qs

8

knob vol

9

claw

nut

6

0

three screws

(+BVTP 2.6

qd

PAD SWITCH board

two claws

5

three screws

(+BVTP 2.6

×

8)

3

CD SW board

1

(+BVTP 2.6

4

(+BVTP 2.6

7

PANEL board

×

8)

four screws

six screws

×

×

8)

8)

qa

five screws

(+BVTP 2.6

×

8)

7

HCD-DX70

2-6. MAIN TRANS BOARD

5

connector (CN973)

qd

TRANS board

6

connector (CN977)

0

two screws (+BVTT 4

×

qs

8)

trans

4

connector (CN403)

1

screw

(+BVTP 3

qa

two screws

(+BVTT 4

×

×

9

panel, back

8

six screws

(+BVTP 3

10)

8)

7

three screws

(+BVTP 3

2

SENSOR board

×

×

10)

10)

2-7. MAIN BOARD, POWER BOARD

4

three screws (+BVTP 3

5

3

two screws (+BVTP 3

POWER

×

board

16)

×

10)

3

connector (CN891)

7

heat sink

6

two screws (+BVTT 3

connector(CN502)

×

8)

connector
(CN503)

2

MAIN board

1

two screws (+BVTP 3

×

10)

8

2-8. SW BOARD, HEAD (A) BOARD, HEAD (B) BOARD

1

five claws

2

SW board

3

Remove the four solderings.

HCD-DX70

2-9. BASE UNIT

5

HEAD (A) board

4

screw (+PTT 2

ground point

×

4),

6

HEAD (B) board

4

screw (+PTT 2

ground point

×

4),

7

two springs (insulator),

coil

6

two stoppers (BU)

8

two insulators

(BU-30)

4

two screws

(+BVTP 2.6

×

5

2

screw (DIA. 12), floating

0

two insulators (BU-30)

9

two springs (insulator), coil

1

flat type wire (CN101)

3

two screws (+PTPWH M2.6), floating

8)

qa

base unit

9

HCD-DX70

2-10. DRIVER BOARD, MOTOR BOARD, CD SENSOR BOARD AND VIDEO BOARD

8

9

tray

screw (+PTPWH 2.6

0

screw (+BVTP 2.6

2

DRIVER board

5

×

8)

MOTOR board

×

8)

3

two screws (+BVTP 2.6

6

flat type wire (CN721)

4

Remove the two solderings of motor.

7

connector(CN722)

qa

CD SENSOR board

×

8)

1

screw (+BVTP 2.6

×

8)

10

SECTION 3

TEST MODE

HCD-DX70

[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 ?/1 simultaneously.

2. The fluorescent indicator tube becomes blank instantaneously,

and the set is reset.

[Hot Reset]

• This mode resets the set with the preset data kept stored in the
memory. The hot r eset mode functions same as if the power
cord is plugged in and out.

Procedure:

1. Press three buttons x , ENTER , and DISPLAY

simultaneously.

2. The fluorescent indicator tube becomes blank instantaneously,

and the set is reset.

[Tuner Step Change]

• A step of AM channels can be changed over between 9 kHz and
10 kHz.

Procedure:

1. Press ?/1 button to turn the set ON.

2. Select the function “TUNER”, and press TUNER/BAND button

to select the BAND “AM”.

3. Press ?/1 button to turn the set OFF.

4. Press ENTER and ?/1 buttons simultaneously, and the display

of fluorescent indicator tube changes to “AM 9 k STEP” or
“AM 10 k STEP”, and thus the channel step is changed over.

[Function Change Mode]

• Select either VIDEO or MD of the external FUNCTION input.

Procedure:

1. Turn on the power.

2. Hold down MD (VIDEO) button then press ?/1 button , and

release ?/1 button first in order not to switch off the set
immediately.
The another function of the previous function is selected , the
input level is also changed and displayed “ MD ” or “VIDEO”.

[GC Test 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, CDDM version,
CDMA version, CDMB, version BDA version, BDB version,
ST version, TA version, TM version and TC 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
pressed again, the display returns to the software version display .
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

“K0 V0”. 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. T o exit from this mode, press three b uttons in the same manner
as step 1, or disconnect the power cord.

[MC Test Mode]

• This mode is used to check operations of the respective sections

of Amplifier, Tuner , and Tape.

Procedure:

* To enter MC Test Mode

1. Press the ?/1 button to turn on the set.

2. Press the three buttons of x , ENTER and DISC 3
simultaneously.

3. The messages MUSIC, MOVIE, GAME and P FILE flash on
the FL display tube.
The input FUNCTION is Changed to VIDEO.

* Check of Amplifier

1. When f (CURSOR UP) button is pressed, GEQ increases to
its maximum and a message “GEQ MAX” appears.

2. When F (CURSOR DOWN) button is pressed, GEQ decreases
to its minimum and a message “GEQ MIN” appears.

3. When g (CURSOR LEFT) or G (CURSOR RIGHT) button
is pressed, GEQ is set to flat and a message “GEQ FLAT”
appears.

4. 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.

5. When the V OLUME control knob is turned counter-clockwise
even slightly , the sound volume decreases to its minim um and a
message “VOLUME MIN” appears for two seconds, then the
display returns to the original display.

* Check of clock frequency

1. T o check the frequency of clock used to run the time in the unit,
the clock output is available at pin 39 (IC 501, MASTER
CONTROL) only during MC test mode.

2. The frequency is 32.768 kHz or so.

* Tuner function

1. 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
channel that has been stored in memory. (It means that the
memory is cleared.)

2. The minimum, center and maximum frequency of each band is
set then.

11

HCD-DX70

* Tape function

1. When a tape is inserted in Deck B and recording is started, the
input source function selects VIDEO automatically.
When CD SYNC/HI-DUB button is pressed during Rec in
function, ALC is turned on.

2. When x button is pressed to stop recording, the Tape (Deck)

B is selected and tape is rewound, tape is rew ound using m
button, tape is stops at around the record-starting position and
playback of the recorded portion of the tape is started. If P AUSE
is inserted even once during recording, tape is rewound to the
position around the PAUSE position and is played back.

3. When CD SYNC / HI-DUB button is pressed during playback

of Deck B, either normal speed or high speed can be selected
by this button.

* AMS Test Mode

1. Set TAPE function

2. Select the desired loop by pressing the PLAY MODE b utton.

Insert a test tape AMS-110A or AMS-120 to Deck A.

3. Press the SPECTRUM button to enter the AMS test mode.

4. After a tape is rewound first, the FF AMS is checked, and the

mechanism is shut off after detecting the AMS signal twice.

5. Then the REW AMS is checked and the mechanism is shut off

after detecting the AMS signal twice.

6. When the check is complete, a message of either OK or NG

appears.

[CD Ship Mode (Memory Clear) ]

• This mode moves the pickup to the position durable to vibra­tion. Use this mode when returning the set to the customer after
repair.

Procedure:

1. Press 1/u button to turn the set ON.

2. Press three buttons x , ENTER and GAME 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.

[CD Ship Mode (No Memory Clear) ]

• This mode moves the pickup to the position durable to vibra­tion. Use this mode when returning the set to the customer after
repair.

Procedure:

1. Press 1/u button to turn the set ON.

2. Press CD button and 1/u button 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.

* To return to normal mode again.

1. When you want to exit this mode, press the ?/1 button.

2. The cold reset is enforced at the same time.

[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.

[CD Service Mode]

• This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the pickup.

Procedure:

1. Press ?/1 button 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.

M

5. With the CD in stop status, press

to outside track, or press m button to inside track.

6. To exit from this mode, perform as follows:

–

b utton to move the pickup

+

1) Move the pickup to the most inside track.

2) Press ?/1 button to turn the set OFF.

Note: • Always move the pickup to most inside tr ack when exiting from

this mode. Otherwise, a disc will not be unloaded.

• Do not run the sled motor excessiv ely, otherwise the gear can be
chipped.

12

[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 ALL DISC CONTINUE, and REPEAT OFF.

2) Load the tapes recording use into the decks A 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

Display

AGING[*][*][*][*]

HCD-DX70

Note:

[*][*][*][*]

Error display

E ** s ## $$ %%

1234 5

1 **

2 s
3 ##

4 $$

5 %%

: Number of aging operations

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.

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

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)

• 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.

13

HCD-DX70

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

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

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

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

of tape

of tape

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 tape A 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]

* elect either VIDEO or MD of the external FUNCTION input.

Procedure:

1. Turn on the power.

2. Press the two buttons ENTER and ?/1 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”.

14

SECTION 4

MECHANICAL ADJUSTMENTS

HCD-DX70

SECTION 5

ELECTRICAL 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
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

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

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)

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 R­CH.

7. Switches and controls should be set as follows unless otherwise
specified.

• Test Tape

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

Record/Playback Head Azimuth Adjustment

0 dB=0.775 V

DECK A DECK B

Note: Perform this adjustments for both decks

Procedure:

1. Mode: Playback

test tape
P-4-A100
(10 kHz, –10 dB)

set

main board
CN301
Pin 3 (L-CH)
Pin 1 (R-CH)

main board
CN301
Pin 2 (GND)

level meter

+
–

15

HCD-DX70

(

)

r

+

–

set

test tape
P-4-L300J
(315 Hz, 0 dB)

main board
CN301 (Pin 3 : L-CH)

level meter

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.

Output
level

within
1dB

L-CH
peak

R-CH
peak

within
1dB

Screw
position

L-CH
peak

Screw
position

R-CH
peak

3. Mode: Playback

test tape
P-4-A100
(10 kHz, –10 dB)

L-CH

MAIN
board
CN301
set

R-CH

waveform of oscilloscope

in phase 45° 90° 135° 180°

pin 3

pin 2

L

R

pin 1

good

oscilloscope

V

wrong

H

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 x button, 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 ?/1 button.

Mode: Playback

test tape
WS-48B
(3 kHz, 0 dB)

set

main board
CN301 (Pin 3 : L-CH)

frequency counte

+

–

Pin 1 : R-CH

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 do 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

4. After the adjustments, apply suitable locking compound to the
pats adjusted.

Adjustment Location: Playback Head (Deck A).

Record/Playback/Erase Head (Deck B).

Playback level Adjustment DECK A DECK B

Procedure:

Mode: Playback

Deck A is RV302 (L-CH), Deck B is RV303 (L-CH) so that
adjustment within adjustment level as follows.

Adjustment Level:

CN301 PB level: 334.4 to 748.7 mV (–7.3 to –0.3 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)

16

forward

reverse

HCD-DX70

(

)

set

MD/VIDEO (AUDIO) IN
315 Hz, 50 mV (–23.8 dB)

blank tape
CS-123

600 Ω

attenuator

AF OSC

(

)

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 rotette
of shuttle knob then rewind to recording start position.)

1. Press MD/VIDEO button to select VIDEO. (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

MD/VIDEO (AUDIO) IN

1) 315 Hz

2) 10 kHz

AF OSC

attenuator



50 mV (–23.8 dB)




600 Ω

blank tape
CN-123

set

4. Mode: Record

5. Mode: Playback

recorded
portion

set

CN301 (Pin 3 : L-CH)

level meter

+

–

Pin 1 : R-CH

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

5. Mode: Playback

recorded
portion

set

CN301 (Pin 3 : L-CH)

level meter

+

–

Pin 1 : R-CH

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 AUDIO 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.)

[MAIN BOARD] (Component Side)

T11

RV11

PB LEVEL (L)

(A)

PB LEVEL (L)

(B)

REC LEVEL (R)

(B)

REC LEVEL (L)

[LEAF SW BOARD] (Component Side)

TAPE SPEED



(NORMAL) (HIGH)

RV1002



RV1001

REC LEVEL (L)

(A)

(B)

CN301

3

1

RV351

CN1001

RV30 1

RV352
RV302

RV353

RV303

CN303

RV304

REC LEVEL (R)

RV354

(A)

CN304

1. Press MD/VIDEO button to select VIDEO. (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.

17

HCD-DX70

FM Tuned Level Adjustment

FM RF SSG

75 Ω coaxial

set

Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 28 dB (at 75 W open)

FM ANTENNA terminal
(TM1)

Procedure:

1. Supply a 28 dB 98 MHz signal from the ANTENNA terminal.

2. Tune the set to 98 MHz.

3. Adjust RV611 to the point (moment) when the TUNED
indicator will change from going off to going on.

Adjustment Location: MAIN board

Null Adjustment

FM RF SSG

75 Ω coaxial

set

Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 60 dB (at 75 W open)

FM ANTENNA terminal
(TM1)

CD SECTION

Note :

1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.

2. Use LUV-P01 (4-999-032-01) unless otherwise indicated.

3. Use an oscilloscope with more than 10MΩ 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.

S-Curve Check

Oscilloscope

BD board

TP(FEO)
TP(DVC)

Procedure :

1. Connect oscilloscope to TP (FEO).

2. Connect between TP (FEI) and TP (DVC ( 1.65 V) by lead
wire.

3. Turn Power switch on.

4. Load a disc (LUV-P01) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)

5. Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak level
within 2 ±0.5 Vp-p.

S-curve waveform

symmetry

Procedure:

1. Supply a 60 dB 98 MHz signal from the ANTENNA terminal.

2. Tune the set to 98 MHz.

3. Measure voltage between pin 21 of IC 601. Adjust T11 ubtil
the voltage becomes 0 V.

Adjustment Location: MAIN board

Adjustment Location

[MAIN BOARD] Component side

NULL

T11

RV11

FM TUNED LEVEL

CN301

3

RV351

1

RV301

RV353

RV303

RV304

RV352
RV302

CN303

CN304

RV354

A

within 2 ±0.5Vp-p

B

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

oscilloscope

BD board

TP(RF)
TP(DVC)

Procedure :

1. Connect oscilloscope to TP (RFDC) and (RFAC).

2. Turned Power switch on.

3. Load a disc (LUV-P01) and playback.

4. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.

18

HCD-DX70

Note: Clear RF signal waveform means that the shape “◊” can be

clearly distinguished at the center of the waveform.

RF signal waveform

VOLT/DIV : 200mV
TIME/DIV : 500ns

level : 0.65 ± 0.15Vp-p (RFDC)

1.1 ± 0.4Vp-p (RFAC)

E-F Balance (1 Track jump) Check

oscilloscope

BD board

TP (TEO)
TP (DVC)

+

–

Procedure:

1. Connect oscilloscope to TP (TEO) and TP (DVC) board.

2. Turned Power switch on.

3. Load a disc (LUV-P01) and playback the number nine track.

4. Press the bB button. (Becomes the 1track jump mode.)

5. Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.

Checking Location:

[BD BOARD]

DVC

RFAC

FEO

TEO

RFDC

1 track jump waveform

B

DVC

level=1.0±0.5Vp-p

Symmetry

6. Adjust RV101 so that A (DC voltage) becomes 0.

Center of
waveform

A (DC voltage)

19

HCD-DX70

SECTION 6

DIAGRAMS

THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)

Note on Schematic Diagram:

• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in Ω and 1/
specified.

f

•

• C : panel designation.

Note:

The components identified by mark 0 or dotted line with
mark 0 are critical for safety.
Replace only with part number specified.

• A : B+ Line.

• B : B– Line.

• H : adjustment for repair.

• Voltages and waveforms are dc with respect to ground

• Voltages are taken with a VOM (Input impedance 10 MΩ).

• Waveforms are taken with a oscilloscope.

• Circled numbers refer to waveforms.

• Signal path.

• Abbreviation

: internal component.

under no-signal (detuned) conditions.

Voltage variations may be noted due to normal produc­tion tolerances.

Voltage variations may be noted due to normal produc­tion tolerances.

F : FM
f : AM
E : PB (DECK A)
d : PB (DECK B)
G : REC (DECK B)
J : CD
c : digital out

AR : Argentina model
SP : Singapore model
MX : Mexican model
E51 : Chiri and Peru model

4

W or less unless otherwise

Note on Printed Wiring Boards:

• X : parts extracted from the component side.

• : Pattern from the side which enables seeing.

• Indication of transistor.

C

These are omitted.

Q

B

CE

These are omitted.

Q

B

E

20

HCD-DX70

d

1

IC101 yj (XTAO)

CD PLAY MODE

6.4Vp-p

16.9344MHz

1.2Vp-p

2

IC101 ta (RFAC)

CD PLAY MODE

3

IC101 ra (TE)

CD PLAY MODE

4

IC101 el (FE)

CD PLAY MODE

400nsec/div

approx 200mVp-p

approx 170mVp-p

1

IC601 is (XOUT)

STOP MODE

4.8Vp-p

4MHz

6-1. CIRCUIT BOARD LOCATION

MAIN TRANS board

CD SW board

PANEL board

SUB TRANS board

SENSOR board

MAIN boar

• WAVEFORMS

– BD BOARD –– MAIN BOARD –

1

IC501 qa (XC-OUT)

STOP MODE

32.768kHz

2

IC501 qd (X-OUT)

STOP MODE

16MHz

– PANEL BOARD –

3

T301 4

TAPE B REC MODE

3.0Vp-p

3.4Vp-p

80.7kHz

120Vp-p

PAD SWITCH board

CD SENSOR board

POWER board

DRIVER board

MOTOR board

VIDEO board

BD board

HEAD (A) board

HEAD (B) board

SW board

2121

HCD-DX70

6-2. BLOCK DIAGRAMS

– TUNER/CD SECTION –

TM1

FM 75Ω

G

AM

OPTICAL PICK-UP

BLOCK

(A,MAX3)

+5V

1

11

Q101

LD

DRIVE

2

DX7,DX7J MODEL

FE1

IF OUT

ANT IN

49

7

OSC OUT

8

VT

5

RF AMP

IC103

27

VC

6

A

7

B

8

C

9

D

10

E

11

F

1

LD

2

PD

IC102

MOTOR/COIL DRIVE

13

CH1OUTR

14

CH1OUTF

11

CH2OUTR

12

CH2OUTF

RFDCO

RFDCI

10

RB4

15

28

29

FE

16

TE

18

22VCC

12HOLD SW

CH1RIN

CH1FIN

CH2RIN

CH2FIN

63

VCC

3

2

6

5

1

FM IF

9

IF OUT

11

FM

24

OSC FM

12

VCO STOP

10

IF REQ MUTE

21

AM RF IN

23

AM OSC

VCC

9

DIGITAL OUT

AM/FM IF MPX

IC11

AM IF IN

AM MIX OUT

TUNED

STEREO

CD

L OUT

L OUT

R OUT

MAIN

SECTION

(Page 23)

13

14

4

2

6

7

BUFFER

Q11

R-CH

IF11

B

Q2

D OUT

L OUT1

L OUT2

SCLK

SCOR

SQSO

XTAI

XTAO

Q1

RF IF
AMP

10

1

22

16

20

19

18

FM

XIN

XOUT

FM OSC

AOUT

AIN

PD

60

72

75

5DATA

7CLOK

6XLAT

2SQCK

9

20

1

66

67

PLL

IC51

FM/AM IF

FM

AM OSC

CL

CE

R-CH

X101

16.9344MHz

RV11

12

7

15

9VCO STOP

8IF REQ

DO

6DO

DI

DI

4DI

CL

5

CE

3

IC201

OPTICAL

DIGITAL

OUT

CF1 CF2

+B A+12V

JR9

X51

4.5MHz

1

8

7

DIGITAL SERVO

DIGITAL SIGNAL PROC.

D/A CONV.

IC101

51

RFAC

43

RFDC

39

FE

41

TE

40

SE

27

SSTP

32

FFDR

33

FRDR

30

TFDR

31

TRDR

LPF11

LPF

L-CH

DO

DI

CL

CE

A

MAIN

SECTION

(Page 23)

MASTER CONTROL

TUNED

3

STEREO

2

21

ST MUTE

23

MC DO

25

MC DI

27

CL

22

CE

35

CD DATA

37

CD CLK

42

XLT

33

SQ CLK

19

SCOR

32

SQ DATA

BU UP/DOWN SW

IC501(1/2)

MTR CNT2

T SENS

• RCH is omitted

• Signal Path

: FM

: AM

: CD

: DIGITAL OUT

IC701

44

45MTR CNT1

49

46OPEN SW

47CLOSE SW

48

9

MOTOR

DRIVE

7

TBL ADDRESS

4

2

IC711

SENSOR

OPEN/CLOSE

S701

S711

BU UP/

DOWN

M721

M

TURN

MOTOR

M102

SLED

MOTOR

M101

SPINDLE

MOTOR

18

CH3OUTR

CH3RIN

23

29

SRDR

M

17

16

CH3OUTF

CH4OUTR

24CH3FIN

25CH4INSIN

28

SFDR

26

MDP

3XRST

43

XRST

M

15

CH4OUTF

MUTE

20

41

HOLD

2222