Sony HCD-NEZ31 Schematic

HCD-NEZ31

SERVICE MANUAL

Ver. 1.0 2006.08

• HCD-NEZ31 is the amplifier, CD player, tape deck
and tuner section in CMT-NEZ31.

Model Name Using Similar Mechanism HCD-NEZ30

CD Section Base Unit Name BU-K8BD83S-WOD

Optical Pick-up block Name KSM-213CDP

TAPE Section

Model Name Using Similar Mechanism HCD-NEZ30
Tape T ransport Mechanism T ype CMAL5Z235A

Mexican Model

SPECIFICATIONS

Amplifier section

Continuous RMS power output (reference): 15 + 15 W (6 ohms at 1 kHz,
10% THD)

The following are measured at AC 120 V, 60 Hz

DIN power output (rated): 11 + 11 W (6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference): 15 + 15 W (6 ohms at 1 kHz,
10% THD)

Inputs

AUDIO IN: Sensitivity 250 mV, impedance 47 kilohms

Outputs

PHONES: Accepts headphones with an impedance of 8 ohms or more
SPEAKER: Accepts impedance of 6 to 16 ohms

CD player section

System: Compact disc and digital audio system
Laser Diode Properties

Emission Duration: Continuous
Laser Output*: Less than 44.6µW
* This output is the value measurement at a distance of 200 mm from the

objective lens surface on the Optical Pick-up Block with 7mm aperture.

Tape deck section

Recording system: 4-track 2-channel, stereo

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section:

Tuning range

87.5 – 108.0 MHz (50 kHz step)
Antenna: FM lead antenna
Antenna terminals: 75 ohms unbalanced
Intermediate frequency: 10.7 MHz

AM tuner section:

Tuning range
530 – 1,710 kHz (with 10 kHz tuning interval)
531 – 1,710 kHz (with 9 kHz tuning interval)
Antenna: AM loop antenna, external antenna terminal
Intermediate frequency: 450 kHz

General

Power requirements

AC 120 V, 60 Hz

Adjustable with voltage selector

Power consumption:

45 watts

Dimensions (w/h/d) (excl. speakers):

Approx. 164 × 235 × 265 mm

Mass (excl. speakers):

Approx. 3.3 kg

Design and specifications are subject to change without notice.

9-887-362-01

2006H05-1
© 2006.08

COMPACT DISC DECK RECEIVER

Sony Corporation

Personal Audio Division
Published by Sony Techno Create Corporation

HCD-NEZ31

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 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.

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.

TABLE OF CONTENTS

1. SERVICING NOTES ............................................... 3

2. GENERAL ................................................................... 5

3. DISASSEMBLY

3-1. Disassembly Flow ........................................................... 7

3-2. Cabinet............................................................................. 7

3-3. Cabinet (Top) Section ...................................................... 8

3-4. Base Unit (BU-K8BD83S-WOD) ................................... 8

3-5. Front Panel Section ......................................................... 9

3-6. Mechanical Deck (CMAL5Z235A) ................................ 9

3-7. MAIN Board.................................................................... 10

3-8. Tuner (FM/AM)............................................................... 10

4. TEST MODE.............................................................. 11

5. MECHANICAL ADJUSTMENTS ....................... 12

6. ELECTRICAL ADJUSTMENTS ......................... 13

7. DIAGRAMS

7-1. Block Diagram – CD SERVO Section – ......................... 15

7-2. Block Diagram – MAIN Section – .................................. 16

7-3. Printed Wiring Board – CD Board – ............................... 18

7-4. Schematic Diagram – CD Board – .................................. 19

7-5. Printed Wiring Boards – MAIN Section – ...................... 20

7-6. Schematic Diagram – MAIN Section (1/2) – .................. 21

7-7. Schematic Diagram – MAIN Section (2/2) – .................. 22

7-8. Printed Wiring Board – PANEL Board – ........................ 24

7-9. Schematic Diagram – PANEL Board – ........................... 25

7-10. Printed Wiring Boards – DC Section – ........................... 26

7-11. Printed Wiring Board – AC Board – ................................ 27

7-12. Schematic Diagram – POWER SUPPLY Section – ........ 28

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY P ARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.

8. EXPLODED VIEWS

8-1. Cabinet Section................................................................ 34

8-2. Mechanical Deck Section ................................................ 35

8-3. Panel Board Section ........................................................ 36

8-4. Cabinet (Top) Section ...................................................... 37

8-5. MAIN Board Section....................................................... 38

8-6. AC Board, DC Board Section ......................................... 39

9. ELECTRICAL PARTS LIST................................ 40

2

SECTION 1

S820

SERVICING NOTES

HCD-NEZ31

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.

UNLEADED SOLDER

Boards requiring use of unleaded solder are printed with the lead­free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

: LEAD FREE MARK

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40 ˚C higher

than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 ˚C.
Caution: The printed pattern (copper foil) may peel away if

the heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

LASER DIODE AND FOCUS SEARCH OPERATION
CHECK

During normal operation of the equipment, emission of the laser
diode is prohibited unless the upper lid is closed while turning ON
the S820. (push switch type)
The following checking method for the laser diode is operable.

• Method

Emission of the laser diode is visually checked.

1. Open the upper lid.

2. Push the S820 as shown in Fig.1.

Note: Do not push the detection lever strongly, or it may be bent or damaged.

3. Press the u button.

4. Check the object lens for confirming normal emission of the
laser diode. If not emitting, there is a trouble in the automatic
power control circuit or the optical pick-up.
In this operation, the object lens will move up and down 2
times along with inward motion for the focus search.

Fig.1 Method to push the S820

3

HCD-NEZ31

k

SERVICE POSITION

– CD BOARD –

CD board

– TAPE MECHANICAL DECK –

cabinet (top) section

tape mechanical dec

4

Basic Operations

Before using the system

To use the remote

Slide and remove the battery compartment lid , and
insert the two supplied R6 (size AA) batteries,
first, matching the polarities shown below.

Notes on using the remote

• With normal use, the batteries should last for about six months.

• Do not mix an old battery with a new one or mix different types of
batteries.

• If you do not use the remote for a long period of time, remove the
batteries to avoid damage from battery leakage and corrosion.

To set the clock

1

Turn on the system.

Press

(power) .

2

Select the clock set mode.

Press CLOCK/TIMER SET
current mode appears on the display, press

on the remote repeatedly to select “CLOCK” and

then press ENTER

3

Set the time.

/ on the remote repeatedly to set

Press
the hour, and then press ENTER
Use the same procedure to set the minute.
The clock settings are lost when you disconnect the
power cord or if a power failure occurs.

on the remote. If the

on the remote.

Selecting a music source

Press the following buttons (or press FUNCTION
repeatedly).

To select Press

CD CD on the remote.

Tuner TUNER/BAND

Tape TAPE

Component (connected
using an audio cord)

FUNCTION
until “AUDIO IN” appears.

Adjusting the sound

To adjust the volume

Press VOLUME +/– on the remote (or turn the
VOLUME control on the unit)

To add a sound effect

To Press

Generate a more dynamic
sound (Dynamic Sound
Generator X-tra)

.

DSGX

side

/

on the remote.

.

on the remote.

repeatedly

on the unit.

SECTION 2

GENERAL

Set the sound effect

Playing a CD/MP3 disc

1

Select the CD function.

Press CD

2

3

To Press

Pause playback (pause) on the remote (or

Stop playback

Select a folder on an
MP3 disc

Select a track or file

Find a point in a
track or file

Select Repeat Play

To change the play mode

Press PLAY MODE repeatedly while the player is
stopped. You can select normal play (“
files in the folder on the disc), shuffle play (“SHUF” or
“

* When playing a CD-DA disc, (SHUF) Play performs the same

operation as normal (SHUF) Play.

Notes on Repeat Play

• All tracks or files on a disc are played repeatedly up to five times.

• “REPEAT 1” indicates that a single track or file is repeated until you
stop it.

Notes on playing MP3 discs

• Do not save other types of files or unnecessary folders on a disc that
has MP3 files.

• Folders that have no MP3 files are skipped.

• MP3 files are played back in the order that they are recorded onto
the disc.

• The system can only play MP3 files that have a file extension of
“.MP3.”

• If there are files on the disc that have the “.MP3” file extension,
but that are not MP3 files, the unit may produce noise or may
malfunction.

• The maximum number of:
– folders is 150 (including the root folder).
– MP3 files is 255.
–
– folder levels (the tree structure of files) is 8.

• Compatibility with all MP3 encoding/writing software, recording
device, and recording media cannot be guaranteed. Incompatible
MP3 discs may produce noise or interrupted audio or may not play
at all.

Notes on playing multisession discs

• If the disc begins with a CD-DA (or MP3) session, it is recognized
as a CD-DA (or MP3) disc, and playback continues until another
session is encountered.

• A disc with a mixed CD format is recognized as a CD-DA (audio)
disc.

on the remote.

Place a disc.

Press

PUSH OPEN/CLOSE on the unit,
and place a disc with the label side up on the CD
compartment.
To close the CD compartment, press
CLOSE

on the unit.

Start playback.

Press

(play) on the remote (or CD/ (play/

pause)

on the unit).

SHUF*”), or program play (“PGM”).

MP3 files and folders that can be contained on a single disc is 256.

Listening to the radio

1

Select “FM” or “AM.”

Press TUNER/BAND

2

Select the tuning mode.

Press TUNING MODE
appears.

3

Tune in the desired station.

Press +/– on the remote (or TUNING +/– on the unit)

. Scanning stops automatically when a station is
tuned in, and then “TUNED” and “STEREO” (for
stereo programs) appear.

on the remote

EQ
repeatedly to select “BASS”
or “TREBLE,” and then
press

/

repeatedly to adjust the level.

PUSH OPEN/

PUSH OPEN/CLOSE

CD/

(play/pause) on the
unit). To resume play, press the
button again.

(stop) .

+/– (select folder) .

/ (go back/go forward)

.

Hold down
forward)
and release the button at the
desired point.

REPEAT
repeatedly until “REPEAT” or
“REPEAT 1” appears.

/ (rewind/fast

during playback,

on the remote

” for all MP3

repeatedly.

repeatedly until “AUTO”

To stop automatic scanning

Press (stop) .

To tune in a station with a weak signal

If “TUNED” does not appear and the scanning does
not stop, press TUNING MODE
“AUTO” and “PRESET” disappear, and then press
+/– on the remote (or TUNING +/– on the unit)
repeatedly to tune in the desired station.

To reduce static noise on a weak FM stereo
station

Press FM MODE on the remote repeatedly until
“STEREO” disappears to turn off stereo reception.

repeatedly until

Playing a tape

1

Select the tape function.

Press TAPE

2

Insert a tape.

Press PUSH OPEN/CLOSE
insert the TYPE I (normal) tape into the cassette
holder with the side you want to play facing forward.
Make sure there is no slack in the tape to avoid
damaging the tape or the tape deck. Press PUSH
OPEN/CLOSE
cassette holder.

3

Start playback.

Press
(play/pause) on the unit).

To Press

Pause playback

Stop playback

Rewind or fast
forward

on the remote.

on the unit, and

on the unit again to close the

(play) on the remote (or TAPE/

(pause) on the remote (or

TAPE/

(play/pause) on the
unit). To resume play, press the
button again.

(stop) .

/ (rewind/fast forward) .

Changing the display

To change Press

Information on
the display*

Display mode
(See below.)

* For example, you can view CD/MP3 disc information, such as the

track or file number or folder name during normal play, or the total
play time while the player is stopped.

The system offers the following display modes.

Display mode When the system is off,

Clock The clock is displayed.

Power Saving

2)

Mode

1)

The STANDBY indicator lights up when the system is off.

2)

When the system is in Power Saving Mode, the following functions
are unavailable:
– setting the clock.
– changing the AM tuning interval
– changing the CD power manage function

Notes on the display information

• The following are not displayed;
– total playing time for a CD-DA disc depending on the play mode.
– total playing time for an MP3 disc.
– remaining playing time for an MP3 file.

• The following are not displayed correctly;
– elapsed playing time of an MP3 file encoded using a VBR

(variable bit rate).

– folder and file names that do not follow either the ISO9660 Level

1, Level 2 or Joliet in the expansion format.

• The following are displayed;
– ID3 tag information for MP3 files when ID3 version 1 and version

2 tags are used.

– up to 30 characters of ID3 tag information using uppercase letters

(A to Z), numbers (0 to 9), and symbols (" $ % ’ ( ) * + , – . / < =
> @ [ \ ] _ ` { | }).

on the remote

DISPLAY
repeatedly when the system is on.

on the remote

DISPLAY
repeatedly when the system is off.

1)

The display is turned off to conserve
power. The timer and clock continue
to operate.

Using optional audio
components

To connect an optional headphones

Connect headphones to the PHONES jack on the
unit.

To connect an optional component

Connect additional audio component to the AUDIO
IN jack

on the unit using an audio analog cord (not
supplied). Turn down the volume on the system, and then
press FUNCTION
function.

repeatedly to select the AUDIO IN

HCD-NEZ31

This section is extracted from
instruction manual.

5

HCD-NEZ31

Other Operations

Creating your own CD program

(Program Play)

Use buttons on the remote to create your own program.

1

Press CD to select the CD function.

2

Press PLAY MODE repeatedly until “PGM”
appears while the player is stopped.

3

Press / repeatedly until the desired
track number appears.

When programming MP3 files, press +/– (select
folder)

repeatedly to select the desired folder, and

then select the desired file.

Selected track or file number

Tot al playing time of program

4

Press ENTER to add the track or file to the
program.

“– –.– –” appears when the total time exceeds 100
minutes for a CD, or when you select an MP3 file.

5

Repeat steps 3 through 4 to program additional
tracks or files, up to a total of 25 tracks or files.

6

To play your program of tracks or files, press
(play)

The program remains available until you open the CD
compartment. To play the same program again, select
the CD function, and press

To cancel Program Play

Press PLAY MODE repeatedly until both “PGM” and
“SHUF” disappear while the player is stopped.

To delete the last track or file of the program

Press CLEAR while the player is stopped.

To view program information, such as total
track number of the program

Press DISPLAY repeatedly.

Presetting radio stations

You can preset your favorite radio stations and tune
them in instantly by selecting the corresponding preset
number.
Use buttons on the remote to preset stations.

1

Tune in the desired station (see “Listening to the
radio”).

2

Press TUNER MEMORY .

3

Press +/– repeatedly to select your desired
preset number.

If another station is already assigned to the selected
preset number, the station is replaced by the new
stations.

4

Press ENTER .

5

Repeat steps 1 through 4 to store other stations.

You can preset up to 20 FM and 10 AM stations. The
preset stations are retained for about half a day even
if you disconnect the power cord or if a power failure
occurs.

6

To call up a preset radio station, press TUNING
MODE
and then press +/–
desired preset number.

(including selected track or file)

.

(play) .

Preset number

repeatedly until “PRESET” appears,

repeatedly to select the

Recording onto a tape

You can record on a TYPE I (normal) tape in two ways:

CD Synchro Recording:

You can record an entire CD onto a tape.

Manual Recording:

You can record just the portions you like from a sound
source, including connected audio components.

Use buttons on the unit to control tape recording.

1

Load a recordable tape with the side you want to
record facing forward.

2

Prepare the recording source.
For CD Synchro Recording:

on the remote to select the CD function.

Press CD
Load the disc you want to record.
When recording a folder from an MP3 disc, press
PLAY MODE
press
the desired folder.
To record only your favorite CD tracks in your desired
order, perform steps 2 through 5 of “Creating your
own CD program.”

For Manual Recording:

Select the desired source to record.

3

Set the tape deck to stand by for recording.
For CD Synchro Recording:

Press CD SYNC

For Manual Recording:

Press

4

Start recording.

While recording, you cannot listen to other sources.

For CD Synchro Recording:

Press
is completed, the CD player and the tape deck stop
automatically. If you are recording onto a tape and
the tape reaches the end of the front side part-way
through a track or file, “TURN TAPE” appears. Turn
the tape over to the reverse side, re-insert it, and
“PUSH REC” appears. And then press
START

For Manual Recording:

Press
the desired recording source.
If there is noise while recording from the tuner,
reposition the appropriate antenna to reduce the noise.

To stop recording

Press (stop) .

Note

Recording stops if you change to a different function.

repeatedly to select “ ” and then

+/– (select folder) repeatedly to select

.

PAUSE/START .

PAUSE/START . When the recording

.

PAUSE/START , and then start playing

PAUSE/

Using the Timers

The system offers three timer functions. You cannot
activate both the Play Timer and the Rec Timer at the
same time. If you use either with the Sleep Timer, the
Sleep Timer has priority.

Sleep Timer:

You can fall asleep to music. This function works even if
the clock is not set.
Press SLEEP on the remote repeatedly. If you select
“AUTO,” the system automatically turns off after the
current disc or tape stops or in 100 minutes.
Do not select “AUTO” during Synchro Recording of a
tape.

Play Timer:

You can wake up to CD, tape or tuner at a preset time.

Rec Timer:

You can record a preset radio station at a specified time.

Use buttons on the remote to control the Play Timer and
the Rec Timer. Make sure you have set the clock.

1

Prepare the sound source.
For Play Timer:

Prepare the sound source, and then press VOLUME

to adjust the volume.

+/–
To start from a specific CD track or MP3 file, create
your own CD program.

For Rec Timer:

Tune in the preset radio station.

2

Press CLOCK/TIMER SET .

3

Press / repeatedly to select “PLAY
SET” or “REC SET” then press ENTER

“ON TIME” appears, and the hour indication flashes.

4

Set the time to start playing or recording.

Press

5

/ repeatedly to set the hour,

and then press ENTER

The minute indication flashes. Use the procedure
above to set the minute.

Use the same procedure as in step 4 to set the
time to stop playing or recording.

.

.

6

Select the sound source or prepare the tape.
For Play Timer:

Press

/ repeatedly until the desired
sound source appears, and then press ENTER
display shows the timer settings.

For Rec Timer:

Load a recordable tape. The display shows the timer
settings.

7

Press (power) to turn off the system.

The system turns on 15 seconds before the preset
time. If the system is on at the preset time, the Play
Timer and the Rec Timer will not play or record.

To activate or check the timer again

Press CLOCK/TIMER SELECT , press /
repeatedly until “PLAY SEL” or “REC SEL” appears,
and then press ENTER

To cancel the timer

Repeat the same procedure as above until “OFF”
appears, and then press ENTER

To change the setting

Start over from step 1.

Tips

• The Play Timer setting remains as long as the setting is not canceled
manually.

• The volume is reduced to minimum during the Rec Timer.

• The Rec Timer is canceled automatically after the Rec Timer has
been activated.

.

.

. The

6

• This set can be disassembled in the order shown below.

)

3-1. DISASSEMBLY FLOW

SET

3-2. CABINET

(Page 7)

3-3. CABINET (TOP) SECTION

(Page 8)

HCD-NEZ31

SECTION 3

DISASSEMBLY

3-5. FRONT PANEL SECTION

(Page 9)

3-6. MECHANICAL DECK (CMAL5Z235A)

(Page 9)

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

3-2. CABINET

3-4. BASE UNIT (BU-K8BD83S-WOD)

(Page 8)

3-7. MAIN BOARD

(Page 10)

3-8. TUNER (FM/AM)

(Page 10)

2

two

screws

(BVTP3

×

10)

1

two

screws

(BVTP3

×

10

2

two

screws

(BVTP3

×

8)

3

cabinet

7

HCD-NEZ31

)

)

3-3. CABINET (TOP) SECTION

1

screw
(BVTP2.6)

5

connector
(S820)

2

claw

3

6

cabinet (top) section

4

wire (flat type) (23 core

(CN317)

2

claw

3-4. BASE UNIT (BU-K8BD83S-WOD)

2

four

screws

(PWH2.6

5

vibration proof rubber
(green)

7

base unit

(BU-K8BD83S-WOD)

×

10)

5

vibration proof rubber
(green)

3

1

6

CD cover

screw
(BVTP2.6)

1

flexible flat cable (23 core)

(CN102)

4

two vibration proof rubbers (red

cabinet (top) section
(bottom view)

8

3-5. FRONT PANEL SECTION

)

)

9

front panel section

4

flexible flat cable (9 core) (FFC803)
(CN900)

3

1

5

connector
(CN301)

2

flexible flat cable (11 core) (FFC804
(CN320)

flexible flat cable (17 core) (FFC805)
(CN321)

flexible flat cable (13 core) (FFC501)
(CN500)

HCD-NEZ31

6

two

screws

×

(BVTP3

8)

8

terminal lead wire
(WIRE300)

3-6. MECHANICAL DECK (CMAL5Z235A)

4

7

harness

screw
(BVTT3

×

6)

1

flexible flat cable (6 core
(FFC801)

2

three

(BVTP2.6)

2

screw
(BVTP2.6)

screws

3

5

mechanical deck
(

CMAL5Z235A

terminal lead wire
(WIRE200)

)

9

HCD-NEZ31

)

r

3-7. MAIN BOARD

1

two connectors
(CN902, CN903)

4

wire (flat type) (9 core)
(CN319)

2

screw (BVTT3

9

heat sink

0

×

8)

Remove

7

two solders.

IC bracket

8

5

6

screw
(BVTP3

screw
(BVTP3

screw
(BVTP3

×

8)

×

×

8)

12

3-8. TUNER (FM/AM)

4

AC board, DC board section

1

screw
(BVTP3

×

8)

2

screw

×

(BVTT3

6)

qs

MAIN board

3

qa

SHIELD board

2

three

screws

×

(BVTT3

3

power cord connecto

(CN901)

6)

10

7

wire (flat type) (9 core)

6

8

tuner
(FM/AM)

5

two

screws

×

(BVTP3

8)

SECTION 4

TEST MODE

HCD-NEZ31

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

I/1 button to turn the power on.

2. While pressing the x button, press the I/1 button and turn

the [VOLUME] knob in the counter-clock wise.

3. The message “RESET” is displayed and the set is reset.

PANEL TEST

All segments of liquid crystal display are tested, and the version
and released date of the micro computer are displayed.

Procedure:

1. Press the I/1 button to turn the power on.

2. While pressing the [DSGX] button, press the l m button

and turn the [VOLUME] knob in the counter-clock wise.
Then all segments of liquid crystal display are turned on.

3. Press the [DSGX] button, the version and released date of the

micro computer are displayed.

example of display:

1104 V104

Version of micro computer
(In this case, version 104)

released date of micro computer
(In this case, released of November 4)

4. Press the [TUNER/BAND] button, the model name and

distination are displayed.

example of display:

6NE NA

CD ERROR HISTORY

When this mode is entered, optical pick-up error code is displayed
with the 8-character format on the fluorescent indicator tube.

Procedure:

1. Set the FUNCTION to CD.

2. While pressing the [DSGX] button, press the CD u button

and turn the [VOLUME] knob in the counter-clock wise.

3. CD error history is displayed on the liquid crystal display.

The first digit from the left indicates:

The first digit from the left indicates which mode the error history
is. In the optical pick-up error code mode, “D” is displayed on the
liquid crystal display.

The second digit from the left indicates:
(Error history No. display)

The second digit from the left indicates which order the error history
is. “1” indicates the latest error history, and each time the number
increases by one, the error history goes back to one-previous error.

The third and 4th digit from the left indicates:
(Error status display)

The third and 4th digit from the left indicates which error status is
indicated.

Display Status

01 Not focused (TOC read without a disc)

02 GFS NG (TOC read with a disc chucked)

03 Start operation time-over

04 Defocused continuously (Defocused during TOC reading)

05 Q code not entered for specified time

06 Tracking not turned ON

07 Blank disc (Blank disc TOC read)

distination
(In this case, North American model)

model name
(In this case, HCD-NEZXX)

5. Press the [PLAY MODE/TUNING MODE] button, “KEY 0 0” is

displayed on the liquid crystal display, and key test mode in.
Each time a key is pressed, the numerical value corresponding
to each key is displayed on the liquid crystal display.

6. To exit from this mode, perform the “COLD RESET”.

TUNER STEP CHANGE-OVER

Either the 9 kHz step or 10 kHz step can be selected for the AM
channel step.

Procedure:

1. Set the FUNCTION to AM, and press the

I/1 button to turn

the power off.

2. While depressing the [TUNER/BAND] button, press the I/1 button.

3. The message “9K STEP” or “10K STEP” is displayed on the
liquid crystal display, and thus the channel step is changed
over.

The 5th and 6th digit from the left indicates:
(Error step display)

The 5th and 6th digit from the left indicates which processing when
a trouble occurred

Display Contents

01 Power OFF in progress

02 Power ON in progress

03 Initialize in progress

04 Oscillation stopping

05 From oscillation stop, oscillation starting

06 Stopping

07 Stop operation is under way

08 Start operation in progress

09 TOC read in progress

0A Search operation is under way

0B Playback operation is under way

0C Pause operation is under way

0D Playback manual search operation is under way

0E Pause manual search operation is under way

The 7th and 8th digit from the left indicates:

The 7th and 8th digit from the left indicates which operation in
progress when a trouble occurred. (Step of each processing of the
5th and 6th digits is indicated)

11

HCD-NEZ31

SECTION 5

MECHANICAL ADJUSTMENTS

CD POWER MANEGE

This mode is for switch the CD power supply on/off. Even if this
state pulls out AC plug, it is held.

Procedure:

1. Press the I/1 button to turn the power on.

2. Set the FUNCTION to CD.

3. Press the I/1 button again to turn the power off (standby).

4. While pressing the CD u button, press the I/1 button.

5. If turns power on and display “CD POWER”, then display
“ON” or “OFF”.

PRECAUTION

1. Clean the following parts with a denatured-alcohol-moistened
swab :

record/playback head pinch roller
erase head rubber belts
capstan idlers

2. Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head magnetizer close to the
erase head.)

3. Do not use a magnetized screwdriver for the adjustments.

4. After the adjustments, appiy 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 Torque Meter Meter Reading

2.95 – 6.86 mN⋅m

FWD CQ-102C (30 – 70 g⋅cm)

(0.42 – 0.97 oz⋅inch)

FWD

Back Tension

FF CQ-201B (more than 60 g⋅cm)

REW CQ-201B (more than 60 g⋅cm)

CQ-102C (1.5 – 5.5 g⋅cm)

0.15 – 5.39 mN⋅m

(0.021 – 0.076 oz⋅inch)

more than 5.89 mN⋅m

(more than 0.83 oz⋅inch)

more than 5.89 mN⋅m

(more than 0.83 oz⋅inch)

TAPE TENSION MEASUREMENT

Mode Tension Meter Meter Reading

FWD CQ-403A

more than 100 g

(more than 3.53 oz)

12

r

set

test tape
P-4-A063
(6.3 kHz, –10 dB)

oscilloscope

V

H

waveform of oscilloscope

in phase 45°90°135°180

°

good

wrong

HEAD PHONE board
PHONES jack
(J500)

SECTION 6

ELECTRICAL ADJUSTMENTS

HCD-NEZ31

0 dB=0.775 VDECK SECTION

1. Demagnetize the record/playback head with a head
demagnetizer.

2. Do not use a magnetized screwdriver for the adjustments.

• Test T ape

Tape Signal Used for

P-4-A063 6.3 kHz, -10 dB Azimuth Adjustment

RECORD/PLA YBA CK HEAD AZIMUTH ADJUSTMENT

Note: Remove the cassette lid assy before this adjustment.

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

Procedure:

1. Mode: Playback

test tape
P-4-A063
(6.3 kHz, –10 dB)

HEAD PHONE board
PHONES jack
(J500)

set

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

Adjustment Location: Record/Playback/Erase Head

level mete

+
–

13

HCD-NEZ31

e

V

CD SECTION

Note:

1. CD Block is basically constructed to operate without adjustment.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3. Use an oscilloscope with more than 10 MΩ 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.

5. Check the focus bias check when optical pick-up block is replaced.

FOCUS BIAS CHECK

oscilloscop

(DC range)

CD board

TP (RFACI)
TP (VC)

+
–

Procedure :

1. Connect oscilloscope to TP (RFACI) and TP (VC) on the CD
board.

2. Press the I/1 button to turn the power ON.

3. Set disc (YEDS-18) on the tray and press the CD u button

to playback.

4. Confirm that oscilloscope waveform is as shown in the figure
below. (eye pattern)

A good eye pattern means that the diamond shape (◊) in the

center of the waveform can be clearly distinguished.

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

level:

0.9

±

0.4 Vp-p

Checking Location:

– CD Board (Conductor Side) –

14

TP

(VC)

IC201

TP

(RFACI)

SECTION 7

DIAGRAMS

7-1. BLOCK DIAGRAM – CD SERVO Section –

OPTICAL
PICK-UP BLOCK
(KSM-213CDP)

A

B

C

D

E

F

LD

PD

AUTOMATIC

POWER CONTROL

Q321

HCD-NEZ31

70

RFACO

57

A

58

B

59

C

60

D

50

E

51

F

66

LD

67

PD

CD DSP

IC201

71

RFACI

AOUT1

AOUT2

XTAO

SSTP

XTAI

112

117

109

108

X201

16.9344MHz

R-CH

• R-ch is omitted due to same as L-ch.

CD

A

(Page 16)

• SIGNAL PATH

: CD PLAY

S201

(LIMIT)

39

D +3.3V

M402

(SLED)

M401

(SPINDLE)

2-AXIS

DEVICE

FOCUS/TRACKING COIL DRIVER,

SLED/SPINDLE MOTOR DRIVER

FCS+

FCS–
TRK+
TRK–

SL+

M

SL–

SP+

M

SP–

12

11
13
14

CH2OUTF

CH2OUTR
CH1OUTR
CH1OUTF

CH3OUTF17

CH3OUTR18

CH4OUTF16

CH4OUTR15

IC402

MUTE

20

CH2FIN

CH2RIN
CH1RIN

CH1FIN

CH3FIN 23

CH3RIN 22

OPIN+

OPOUT

CH4IN

31

O-CD-DATA

30

O-CD-CLK

8

O-CD-XLAT

29

I-CD-SENS

I-MP3-DATA

7
5

O-MP3-DATA

6

O-MP3-CLK

10

O-MP3-XLAT
O-MP3-REQ12

49

I-MP3-REQ

50

I-MP3-ACK

11

O-MP3-SSTB

34

O-CD-XTACN

3

O-CD-XRST

11

O-MP3-SSTB

SYSTEM CONTROLLER

IC801 (1/2)

6

7
5
4

3

27

24

45

FFDR

89

46

FRDR

44

TRDR

43

TFDR

SFDR

41

SRDR42

38

MDP

XRST

8

DATA
CLOK
XLAT
SENS 20

SCOR

DATA2

CLK2

XLAT-MP3

REQ-MP3

IREQ-MP3 10

ACK-MP3

SSTB-MP3

XTACN

11
16

26 I-CD-SCOR43

12
90
13
14

15
85

7

HCD-NEZ31

1515