Sony HCD-EC68,HCD-EC78 Service Manual

HCD-EC68/EC78

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SERVICE MANUAL

Ver. 1.0 2008.02

TEL 13942296513 QQ 376315150 892498299

• HCD-EC68 is the ampliﬁ er, CD player, tape deck (except UK model) and tuner section in MHC-EC68.

• HCD-EC78 is the ampliﬁ er, CD player, tape deck and tuner section in MHC-EC78.

Photo : HCD-EC78

CD Section

Tape deck Section (EXCEPT EC68: UK)

Model Name Using Similar Mechanism

Mechanism Type

Optical Pick-up Block Name

Model Name Using Similar Mechanism

Tape Transport Mechanism Type

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AEP Model

E Model

HCD-EC68/EC78

UK Model

Australian Model

HCD-EC68

NEW

CDM88A-K6BD90-WOD

KSM-213DCP

HCD-EC77

TCM-J1 or CS-21SC-900TP

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section

HCD-EC78

European and Russian models:

Power output (rated): Low channel 55 W + 55 W (at 8 Ω, 1 kHz, 1% THD) High chann el 55 W + 55 W (at 8 Ω, 8 kHz, 1% THD)

RMS output power (reference):

Low channel 75 W + 75 W (per channel at 8 Ω, 1 kHz, 10% THD) High chann el 75 W + 75 W (per channel at 8 Ω, 8 kHz, 10% THD)

Other models:

Power output (rated): Low channel 50 W + 50 W (at 8 Ω, 1 kHz, 1% THD) High chann el 50 W + 50 W (at 8 Ω, 8 kHz, 1% THD)

RMS output power (reference):

Low channel 70 W + 70 W (per channel at 8 Ω, 1 kHz, 10% THD) High chann el 70 W + 70 W (per channel at 8 Ω, 8 kHz, 10% THD)

HCD-EC68

European and Russian models (except for the UK model):

Power output (rated): 50 W + 50 W (at 6 Ω, 1 kHz, 1% THD)

RMS output power (reference):

70 W + 70 W (per channel at 6 Ω, 1 kHz, 10% THD)

Power output (rated): 55 W + 55 W (at 6 Ω, 1 kHz, 1% THD)

RMS output power (reference):

75 W + 75 W (per channel at 6 Ω, 1 kHz, 10% THD)

Other models:

SPECIFICATIONS

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Power output (rated): 50 W + 50 W (at 6 Ω, 1 kHz, 1% THD)

RMS output power (reference):

70 W + 70 W (per channel at 6 Ω, 1 kHz, 10% THD)

Inputs

AUDIO IN (stereo mini jack): Sensitivity 800 mV, impedance 22 kilohms

Outputs

PHONES (stereo mini jack): Accepts headphones with an impedance of 8 Ω or more SPEAKER: impedance HCD-EC78: 8 Ω HCD-EC68: 6 Ω

CD player section

System: Compact disc and digital audio system

Laser: Semiconductor laser (λ=770 – 810 nm) Emission duration: continuous Frequency response: 20 Hz – 20 kHz Signal-to-noise ratio: More than 90 dB Dynamic range: More than 88 dB

Tape deck section (except fortheUKmodel)

Recording system: 4-track 2-channel, stereo

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COMPACT DISC DECK RECEIVER

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Tuner section

FM stereo, FM/AM superheterodyne tuner Antenna:

FM lead antenna AM loop antenna

FM tuner section:

Tuning range:

87.5 – 108.0 MHz (50 kHz step) Intermediate frequency: 10.7 MHz

AM tuner section:

Tuning range Australian, Pan-American models: 530 – 1,710 kHz (with 10 kHz tuning interval) 531 – 1,710 kHz (with 9 kHz tuning interval) European and Russian models: 531 – 1,602 kHz (with 9 kHz tuning interval) Other models: 530 – 1,610 kHz (with 10 kHz tuning interval) 531 – 1,602 kHz (with 9 kHz tuning interval) Intermediate frequency: 450 kHz

– Continued on next page –

EXCEPT HCD-EC68: UK MODEL

HCD-EC68: UK MODEL

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9-889-007-01

2008B05-1

©

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2008.02

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Sony Corporation

Audio Business Group Published by Sony Techno Create Corporation

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COMPACT DISC RECEIVER

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HCD-EC68/EC78

General

Power requirements:

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European and Russian models: AC 230 V, 50/60 Hz Mexican model: AC 127 V, 60 Hz Argentine model: AC 220 V, 50/60 Hz Australian model: AC 230 – 240 V, 50/60 Hz Other models: AC 120, 220 or 230 – 240 V, 50/60 Hz, adjustable with voltage selector

Power consumption:

HCD-EC78

European and Russian models: 160 W

Mexican model: 160 W Other models: 150 W

HCD-EC68

European and Russian models (except for the UK model): 100 W

Other models: 100 W

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

Approx. 200 × 306 × 415 mm

Mass (excl. speakers):

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HCD-EC78

European and Russian models: Approx. 6.0 kg Other models: Approx. 6.3 kg

HCD-EC68

European and Russian models (except for the UK model):

Other models: Approx. 5.3 kg

0.5 W (in Power Saving Mode)

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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.

CAUTION

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

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0.5 W (in Power Saving Mode)

Approx. 5.3 kg

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This appliance is classified as a CLASS 1 LASER product. This marking is located on the rear exterior.

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

2. GENERAL .................................................................. 6

3. DISASSEMBLY

3-1. Disassembly Flow ........................................................... 8

3-2. Side Panel (L)/(R) ........................................................... 9

3-3. Top Panel (EC68: UK model)/Top Panel Block

(Except EC68: UK model) .............................................. 9

3-4. Tape Mechanism Deck (Except EC68: UK model) ........ 10

3-5. MAIN Board ................................................................... 10

3-6. Front Panel Section ......................................................... 11

3-7. Back Panel Block ............................................................ 11

3-8. CD Mechanism Block ..................................................... 12

3-9. BU Block ........................................................................ 12

3-10. OP Base Assy (KSM-213D) ........................................... 13

4. TEST MODE ............................................................ 14

5. MECHANICAL ADJUSTMENTS ...................... 18

6. ELECTRICAL ADJUSTMENTS ........................ 18

7. DIAGRAMS

7-1. Printed Wiring Board - CD Board - ................................ 24

7-2. Schematic Diagram - CD Board - ................................... 25

7-3. Printed Wiring Board

- DECK Board (Except EC68: UK model) - .................. 26

7-4. Schematic Diagram

- DECK Board (Except EC68: UK model) - .................. 26

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7-5. Printed Wiring Board - MAIN Board - ........................... 27

7-6. Schematic Diagram - MAIN Board (1/2) - ..................... 28

7-7. Schematic Diagram - MAIN Board (2/2) - ..................... 29

7-8. Printed Wiring Board - HI AMP Board (EC78) - ........... 30

7-9. Schematic Diagram - HI AMP Board (EC78) - .............. 30

7-10. Printed Wiring Board - LOW AMP Board - ................... 31

7-11. Schematic Diagram - LOW AMP Board - ...................... 31

7-12. Printed Wiring Board - PANEL Board (Sufﬁ x-12) - ...... 32

7-13. Printed Wiring Board - PANEL Board (Sufﬁ x-13) - ...... 32

7-14. Schematic Diagram - PANEL Board - ............................ 33

7-15. Printed Wiring Boards - KEY Section - .......................... 34

7-16. Schematic Diagram - KEY Section - .............................. 34

7-17. Printed Wiring Board - PT Board - ................................. 35

7-18. Schematic Diagram - PT Board - .................................... 36

8. EXPLODED VIEWS

8-1. Panel Section ................................................................... 44

8-2. Tape Deck Section (Except EC68: UK).......................... 45

8-3. Front Panel Section ......................................................... 46

8-4. Chassis Section ............................................................... 47

8-5. Main Section ................................................................... 48

8-6. CD Mechanism Section (CDM88A-K6BD90-WOD) .... 49

9. ELECTRICAL PARTS LIST .............................. 50

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SERVICING NOTES

HCD-EC68/EC78

NOTES ON HANDLING THE OPTICAL PICK-UP

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BLOCK OR BASE UNIT

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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 ﬂ exible 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 reﬂ ective 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

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.

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Caution: The printed pattern (copper foil) may peel away if the

• Strong viscosity

Unleaded solder is more viscou-s (sticky, less prone to ﬂ ow)

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.

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the lead free mark due to their particular size)

: LEAD FREE MARK

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

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MODEL IDENTIFICATION – Back Panel –

EC68: AEP model

EC68: 120V AC area in E, Chilean and Peruvian models

EC78: AEP model

EC78: 120V AC area in E, Chilean and Peruvian models

EC68: Russian model

EC68: UK model

EC68: 240V AC area in E model

EC68: Australian model

EC68: Mexican model

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EC68: Argentina model

EC78: Russian model

EC78: 240V AC area in E model

EC78: Mexican model

EC78: Argentina model

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Model Part No.

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MODEL NUMBER LABEL

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3-296-777-0[]

3-296-779-0[]

3-296-780-0[]

3-296-782-0[]

3-398-081-0[]

3-398-082-0[]

3-398-083-0[]

3-398-084-0[]

3-398-085-0[]

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3-398-086-0[]

3-398-088-0[]

3-398-090-0[]

3-398-091-0[]

3-398-092-0[]

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RELEASING THE DISC TRAY LOCK

The disc tray lock function for the antitheft of an demonstration disc in the store is equipped.

Releasing Procedure:

1. Press [I/

2. Press the [FUNCTION] button to select CD function.

3. While pressing the [ seconds).

4. The message “UNLOCKED” is displayed and the disc tray is unlocked.

Note: When “LOCKED” is displayed, the slot lock is not released by

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] button to turn the power on.

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turning power on/off with the [I/1] button.

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SUFFIX-12/SUFFIX-13 DISCRIMINATION OF PANEL BOARD

– PANEL Board (Component Side) –

LCD301

CN304

Suffix-12 : 1-875-490-12 Suffix-13 : 1-875-490-13

S301

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HCD-EC68/EC78

HOW TO OPEN THE TRAY WHEN POWER SWITCH TURN OFF

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door (CD)



pull the tray by the hand.



gear

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HOW TO REMOVE THE KNOB (VOL)

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lever

Turn a gear by a driver



till a lever falls down to the position of the figure.

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knob (VOL)

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front panel block (back view)

Push the knob (VOL) by the flat head driver.

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CAPACITOR DISCHARGE FOR ELECTRIC SHOCK PREVENTION

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In checking the MAIN board, make a capacitor discharge of C622, C676, C677 and C678 for electric shock prevention.

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800 Ω/2W

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HCD-EC68/EC78

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C626 (EC68/EC78: E2, E3, E51, MX, AR), C678 (EC78: AEP, RU)

C622 (EC68/EC78: E2, E3, E51, MX, AR), C677 (EC78: AEP, RU)

MAIN board

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800 Ω/2W

• Abbreviation AR : Argentina model E2 : 120V AC area in E model E3 : 240V AC area in E model E51 : Chilean and Peruvian models MX : Mexican model RU : Russian model

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HOW TO DISTINGUISH TAPE MECHANISM DECK (EXCEPT EC68: UK MODEL)

Two kinds of tape mechanism decks installed by this set exist.

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MAIN board

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Please do the repair exchange after conﬁ rming which tape mechanism deck set of the repair according to how to distinguish the ﬁ gure below.

tape deck

motor

Metal part: TCM-J1 Mold part: CS-21SC-900TP

Tape Deck Name Tape Deck Part No. Belt Part No.

TCM-J1

CS-21SC-900TP

A-1527-851-A

1-797-575-11

2-670-389-01 BELT (1) 3-214-817-01 BELT (FR)

2-688-621-01 BELT (R/F) 2-688-622-01 BELT (MAIN)

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HCD-EC68/EC78

SECTION 2

GENERAL

Compatibility with all MP3 encoding/writing soware, recording

Basic Operations

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Selecting a music source

Press the following buttons (or press FUNCTION

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2)

(connected

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repeatedly).

To select Press

CD

Tun e r

1)

Tap e

Component using an audio cord)

1)

Except for the UK model.

2)

If the component has the AVLS (Automatic Volume Limiter System) or BASS BOOST function, turn o the function to avoid distorted sound from the speakers.

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CD

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TUNER/BAND

TAP E .

FUNCTION repeatedly until “AUDIO IN” appears.



Adjusting the sound

To adjust the volume

Press VOLUME +/– (or turn the VOLUME control on



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the unit)

To add a sound eect

To Pr es s

* Except for the UK model

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

Set the sound eect

DSGX

EQ



on the unit.

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Playing a CD/MP3 disc

is manual mainly explains operations using the remote, but the same operations can also be performed using the buttons on the unit having the same or similar names.

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Before using the system

To use the remote

Slide and remove the battery compartment lid , and insert the two R6 (size AA) batteries (supplied),  side rst, 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 dierent 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.

Batteries installed devices shall not be exposed to excessive heat such

as sunshine, re or the like.

To set the clock

1 Turn on the system.

Press  (on/standby)

2 Select the clock set mode.

Press CLOCK/TIMER SET ashes. If “PLAY SET” ashes, press / repeatedly to select “CLOCK,” and then press ENTER



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3 Set the time.

Press / press ENTER Use the same procedure to set the minutes.

Note

e clock settings are lost when you disconnect the power cord or if a power failure occurs.

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

to turn on the system.



. e hour indication



repeatedly to set the hour, then



. e minute indication ashes.

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

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1 Select the CD function.

Press CD (or FUNCTION repeatedly)

2 Place a disc.

Press  (open/close) disc with the label side up on the disc tray. To place additional discs, slide the disc tray with your nger as shown below. To close the disc tray, press  (open/close) unit. Do not force the disc tray closed with your nger, as this may damage the unit.

3 Select a disc.

If the discs are currently stopped, press DISC SKIP



. To change discs while in other functions, press

DISC1–3

4 Start playback.

Press  (play) (or CD  (play) on the unit) To exchange other discs during playback, press EX-CHANGE

To Pr es s

Pause playb ack

Stop playback

Select a folder on an MP3 disc

Select a track or le

Find a point in a track or le

Select Repeat Play

To change the play mode

Press PLAY MODE  repeatedly while the player is stopped. You can select normal play (no display for all discs or “1 DISC” for a disc or “ in the folder on the disc), shue play (“SHUF” for all discs shue, “1 DISC SHUF” for one disc shue

SHUF*” for folder shue), or program play

or “ (“PGM”).

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

operation as 1 DISC (SHUF) Play.

Notes on Repeat Play

All tracks or les on a disc are played repeatedly up to ve times. You cannot select “REP” and “SHUF” (all discs shue) at the same

time.

“REP1” indicates that a single track or le is repeated until you stop

it.

Notes on playing MP3 discs

Do not save other types of tracks or les or unnecessary folders on a

disc that has MP3 les.

Folders that have no MP3 les are skipped. MP3 les are played back in the order that they are recorded onto

the disc.

e system can only play MP3 les that have a le extension of

“.MP3”.

If there are les on the disc that have the “.MP3” le extension,

but that are not MP3 les, the unit may produce noise or may malfunction.

e maximum number of:

folders is 150 (including the root folder). MP3 les is 255. MP3 les and folders that can be contained on a single disc is 300. folder levels (the tree structure of les) is eight.





on the unit.



on the unit.

 (pause) press the button again.

 (stop)

(select folder) +/– .

/ (go back/go forward) (or / on the unit)

Hold down / (rewind/fast forward) release the button at the desired point.

REPEAT “REP” or “REP1” appears.

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

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on the unit, and place a





. To resume play,



.



during playback, and



repeatedly until

” for all MP3 les

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on the

device, and recording media cannot be guaranteed. Incompatible MP3 discs may produce noise or interrupted audio or may not play at all.

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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.

.

Listening to the radio

1 Select “TUNER FM” or “TUNER AM.”

Press TUNER/BAND

2 Select the tuning mode.

Press TUNING MODE appears.

3 Tune in the desired station.

Press +/– (or TUNING +/– on the unit) Scanning stops automatically when a station is tuned in, and then “TUNED” and “ST” (for stereo programs) appear.

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 “MANUAL” appears, and then press +/– (or TUNING +/– on the unit) station.

To reduce static noise on a weak FM stereo station

Press FM MODE  repeatedly until “MONO” appears to turn o stereo reception.



repeatedly to tune in the desired

Playing a tape (Except for the UK model)

1 Select a tape function.

Press TAPE (or FUNCTION repeatedly)

2 Insert a tape.

Press  (stop/eject) tape into the cassette holder. Make sure there is no slack in the tape to avoid damaging the tape or the tape deck.

3 Start playback.

Press  (play)

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To Pr es s

Pause playb ack

Stop playback

Rewind or fast



.

forward*

* Be sure to press  (stop/eject)  on the unit aer the tape has

been wound or rewound to the end.

Note

Do not turn o the system during playback or recording.

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

on the unit.

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 (pause) play, press the button again.

 (stop/eject) /

on the unit.

Changing the display

To Pr es s

Change



.

information on the display* Change Display mode (See below.)

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

track or le number during normal play. track or le name (“ artist name (“ album or folder name (“ total playing time while the player is stopped.

e system oers the following display modes.

Display mode When the system is o,

Power Saving Mode

Clock

1)

You cannot set the clock in Power Saving Mode.

2)

e clock display automatically turns to Power Saving Mode aer eight seconds.

Notes on the display information

Characters that cannot be displayed appear as “_”. e following are not displayed;

total playing time for an MP3 disc. remaining playing time for an MP3 le.

e following are not displayed correctly;

elapsed playing time of an MP3 le encoded using VBR (variable

bit rate).

folder and le names that do not follow either the ISO9660

Level 1, Level 2 or Joliet in the expansion format.

e following are displayed;

total playing time for a CD-DA disc when the play mode is

“1 DISC”.

remaining playing time for a track. ID3 tag information for MP3 les when ID3 version 1 and

version 2 tags are used (ID3 version 2 tag information display has priority when both ID3 version 1 and version 2 tags are used for a single MP3 le).

up to 15 characters of ID3 tag information using uppercase letters

(A to Z), numbers (0 to 9), and symbols (‘< > * + , – / @ [ \ ] _).

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DISPLAY system is turned on.

DISPLAY system is turned o.

”) during normal play.

e display is turned o to conserve

1)

power. e timer and clock continue to operate.

2)

e clock is displayed.

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

repeatedly.





on the unit, and insert the

(rewind/fast forward)

”) during normal play.

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repeatedly until “AUTO”



.



repeatedly until



.

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1

3

6



on the unit. To resume



on the unit.



repeatedly when the



repeatedly when the

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This section is extracted from instruction manual.

Using optional audio components

4

2

To connect an optional headphones

Connect headphones to the PHONES jack  on the unit.

To connect an optional component

Connect additional audio source components to the AUDIO IN jack cord (not supplied). Tur n down the volume on the system, and then select the AUDIO IN function.

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on the unit using an analog audio

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TEL 13942296513 QQ 376315150 892498299

9

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HCD-EC68/EC78

Other Operations

7

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TEL 13942296513 QQ 376315150 892498299

TEL

3

Creating your own CD program (Program Play)

Use buttons on the remote to create your own program.



1 Press CD

2 Press PLAY MODE

3 Press DISC SKIP 4 Press / (or

5 Press ENTER

6 Repeat steps 3 through 5 to program additional

7 To play your program of tracks or les, press  (or

To cancel Program Play

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

To delete the last track or le 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 favourite radio stations and tune them in instantly by selecting the corresponding preset number.

1 Tune in the desired station (See “Listening to the

2 Press TUNER MEMORY

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

4 Press ENTER

5 Repeat steps 1 through 4 to store other stations.

6 To call up a preset radio station, press TUNING

to select the CD function.

while the player is stopped.

repeatedly until the desired track number appears.

When programming MP3 les, press repeatedly to select the desired folder, and then select the desired le.

Selected track or le number



program.

tracks or les, up to a total of 25 tracks or les.

CD  on the unit)

e program remains available until you open the disc tray. To play the same program again, select the CD function, and then press  (or CD  on the unit)



.

13942296513

radio”

)

.

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.



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



repeatedly until “PRESET” appears, and

MODE then press +/– (or TUNING +/– on the unit) repeatedly to select the desired preset number.

6



repeatedly until “PGM” appears



to select a disc.

on the unit)

/

+/–

Total playing time of the selected track

to add the track or le to the



.



.

Preset number



repeatedly

.

3







Recording onto a tape (Except for the UK model)

1

5

1

Use a TYPE I (normal) tape only.

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 Insert a recordable tape into the cassette holder

with the side you want to record facing up.

2 Prepare the recording source.

Select the desired source to record. Place the disc you want to record and press DISC



to select a disc.

SKIP When recording a folder from an MP3 disc, press PLAY MODE

+/–  repeatedly to select the desired

press folder. To record only your favourite CD tracks or MP3 les in your desired order, perform steps 2 to 5 of “Creating your own CD program.”

3 Start recording.

Press  (record) desired recording source. e CD starts playing automatically aer 10 seconds have passed. If there is noise while recording from the tuner, reposition the appropriate antenna to reduce the noise. While recording, you cannot listen to other sources.

To stop recording

Press .

Tip

We recommend that you press  rst, and then press  to avoid noise being recorded when you stop recording.

Using the timers

e system oers two timer functions. If you use both timers, the Sleep Timer has priority. Use buttons on the remote to use the timer functions.

Sleep Timer:

You can fall asleep to music. is function works even if the clock is not set.



Press SLEEP system automatically turns o aer the current disc or tape stops or in 100 minutes. If the tape deck is still playing or recording at the set time, the system turns o aer the tape deck stops.

Play Timer:

You can wake up to CD or tuner at a preset time. Make sure you have set the clock.

1 Prepare the sound source.

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



to adjust the volume. To start from a specic CD track or MP3 le, create your own CD program.

2 Press CLOCK/TIMER SET 3 Press /

then press ENTER

“ON TIME” appears, and the hour indication ashes.

4 Set the time to start playback.

Press / press ENTER

e minute indication ashes. Use the procedure above to set the minutes.

5 Use the same procedure as in step 4 to set the time

to stop playback.

6 Select the sound source.

Press / you want appears, then press ENTER shows the timer settings.



7 Press 

If the system is on at the preset time, the Play Timer will not play.

To activate or check the timer again

Press CLOCK/TIMER SELECT , press / repeatedly until “PLAY SEL” appears, 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.

Tip

e Play Timer setting remains as long as the setting is not cancelled manually.

5



repeatedly to select “ ,” and then



, and then start playing the

repeatedly. If you select “AUTO,” the



.



repeatedly to select “PLAY SE T,”



.



repeatedly to set the hour, then



.



repeatedly until the sound source

to turn o the system.



.

0

Q

. e display

7

3



8

6

3

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1

5

2

1

5

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0

9

8

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HCD-EC68/EC78

SECTION 3

DISASSEMBLY

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

7

Q

3-1. DISASSEMBLY FLOW

3-2. SIDE PANEL (L)/(R) (Page 9)

3-3. TOP PANEL (EC68: UK MODEL)/TOP PANEL BLOCK (EXCEPT EC68: UK MODEL) (Page 9)

3

SET

6

3

1

5

1

5

0

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9

2

4

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8

2

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TEL 13942296513 QQ 376315150 892498299

3-4. TAPE MECHANISM DECK (EXCEPT EC68: UK MODEL) (Page 10)

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13942296513

3-5. MAIN BOARD (Page 10)

3-6. FRONT PANEL SECTION (Page 11)

3-8. CD MECHANISM BLOCK (Page 12)

3-9. BU BLOCK (Page 12)

3-11. OP BASE ASSY (KSM-213D) (Page 13)

7

3

Q

3-7. BACK PANEL BLOCK (Page 11)

5

1

5

1

3

6

0

8

9

2

4

9

8

2

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Note: Follow the disassembly procedure in the numerical order shown below.

7

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TEL 13942296513 QQ 376315150 892498299

3

3-2. SIDE PANEL (L)/(R)

four screws



(case3 TP)

6

side panel (L)



3

1

5

1

5

0

two screws



(BVTP3 × 10)

8

9

2

4

HCD-EC68/EC78

2

9

8

two screws



(BVTP3 × 10)

9

TEL 13942296513 QQ 376315150 892498299



four screws



(case3 TP)

TEL

13942296513

3-3. TOP PANEL (EC68: UK MODEL)/TOP PANEL BLOCK (EXCEPT EC68: UK MODEL)

top panel (EC68: UK)



top panel block (except EC68: UK)

flexible flat cable (9 core)



(CN606) (except EC68: UK)

two screws



(BVTP3 × 10)

screw



(KTP3 × 10)

Q

3

7

6

3

1

5

1

5

0

8

side panel (R)

8

9

4

2

9

two screws



(BVTP3 × 10)

2

9

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1

6

3



.

c

(KTP3 × 10)

screw

o

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9

HCD-EC68/EC78

3-4. TAPE MECHANISM DECK (EXCEPT EC68: UK MODEL)

7

Q

Note: This illustration is seeing top panel block from inside.

3

6

two screws



(2.6 × 8)

1

3

two screws



(2.6 × 8)

bracket (deck)



5

1

5

0

9

8

DECK board



two screws



(BVTP3 × 6)

connector (CN501)



2

4

9

8

2

9

TEL 13942296513 QQ 376315150 892498299

3-5. MAIN BOARD

TEL

two screws

RE

(BVTP3 × 6)

tape mechanism deck



(TCM-J1 or CS-21SC-900TP)

connector (CN151)



13942296513

MAIN board

RG

top panel block

3

Q

flexible flat cable (5 core)



(CN603)

flexible flat cable (5 core)



(CN602) (EC78)

7



1

5

1

3

6

connector (CN633)

connector (CN601)



9

8

0

5

two screws

RT

(BVTP3 × 10) (EC78)

8

9

4

2

two screws

RB

(BVTP3 × 10)

2

9

TEL 13942296513 QQ 376315150 892498299

9

screw



(BVTP3 × 10)

flexible flat cable (27 core)



(CN607)

flexible flat cable (9 core)



(CN605)



flexible flat cable (21 core)

w

10



w

(CN608)

connector (CN604)

.

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3

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3-6. FRONT PANEL SECTION

7

Q

3



(CN607)



6

3

flexible flat cable (27 core)

front panel section

1

5

flexible flat cable



(9 core) (CN605)

1

5

0

8

9

2

HCD-EC68/EC78

4

9

flexible flat cable (13 core)



(CN302)

8

2

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TEL 13942296513 QQ 376315150 892498299

pull the tray by hand.



two screws



door (CD)

TEL

13942296513

3-7. BACK PANEL BLOCK



connector (power cord)



(CN053)

(BVTP3 × 10)

Q

connector (CN601)



Q

3

7

6

gear

5

1

5

1

3

two screws



(BVTP3 × 10) (EC78)

lever

Turn a gear by a driver



till a lever falls down to the position of the figure.

0

8

9

2

4

9

8

2

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TEL 13942296513 QQ 376315150 892498299

9

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screw



(BVTP3 × 10)

.

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1

two screws



(BVTP3 × 10)



(BVTP3 × 10)



(BVTP3 × 10)

back panel block



Cut the clamp.



Note: Please do not forget fixation by clamping when you install the power cord.

6

3

.

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six screws

two screws

11

HCD-EC68/EC78

3-8. CD MECHANISM BLOCK

7

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TEL 13942296513 QQ 376315150 892498299

3

CD mechanism block



6

1

5

3

flexible flat cable



(21 core) (MAIN board: CN608/ CD board: CN201)

1

5

0



8

9

2

4

9

8

2

9

TEL 13942296513 QQ 376315150 892498299

TEL



3-9. BU BLOCK

13942296513

flexible flat cable (13 core)

insulator



Q

four screws



(BVTP3 × 10)

8

0

5

1

5

1

3

6

7

3

Q

two tapes



Note: When installing the CD mechanism section, install two tapes for prevention of noise.

BU block



9

2

4

9

8

2

9

12

w

.

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insulator



two coil springs



(insurator)

two screws



(PTPWHM2.6)



(insurator)

insulator



o

y

u

1

two screws



(PTPWHM2.6)

6

3

insulator



two coil springs

.

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3-10. OP BASE ASSY (KSM-213D)

7

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3

6

3

1

5

1

5

0

op base assy



(KSM-213D)

flexible flat cable (16 core)



(CN301)

8

9

2

4

HCD-EC68/EC78

2

9

8

9

TEL 13942296513 QQ 376315150 892498299

TEL

Remove four solders.



13942296513

Q

3

CD board



6

7

3

1

5

1

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0

8

9

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HCD-EC68/EC78

SECTION 4

TEST MODE

COLD RESET

The cold reset clears all data including preset data stored in the

Q

memory to initial conditions. Execute this mode when returning the set to the customer.

Procedure:

1. In the standby status, press the [ on.

2. Press three buttons of [x], [FUNCTION] and at last [ multaneously.

3. When “RESET” appears, the set enters standby status.

PANEL TEST MODE

Enter The Panel Test Mode

Procedure:

1. In the standby status, press the [

TEL 13942296513 QQ 376315150 892498299

on.

2. Press three buttons of [DISPLAY], [x], and [FUNCTION] simultaneously.

3. When the panel test mode is activated, LEDs and segments of the liquid crystal display are all turned on.

Version Check

Procedure:

1. In the panel test mode (all LEDs and segments of the liquid crystal display are turned on), press the [FUNCTION] button.

2. On the liquid crystal display, date and version are displayed “xxxxxxxx”. For example, “1114V102”.

3. From this status, press the [X] button, and the destination and model name are displayed. For example, “CE2” and “ESLO– ”

4. To release from this mode, press three buttons of [DISPLAY], [

], and [FUNCTION] simultaneously.

x

TEL

Key Test Mode

Procedure:

1. In the panel test mode (all LEDs and segments of the liquid crystal display are turned on), press the [DISPLAY] button.

2. The message “KEY0 0 0”displayed. Whenever any buttons are pressed and the [VOLUME] dial is turned, the value is changed.

3. To release from this mode, press three buttons of [DISPLAY], [

], and [FUNCTION] simultaneously.

x

CD REPEAT 5 LIMIT CANCEL MODE

Number of repeats for CD playback is 5 times when the repeat mode is “REPEAT”. This mode enables CD to repeat playback for limitless times.

Procedure:

1. Press the [

2. Press the [FUNCTION] button to select CD function.

3. Press three buttons of [DISPLAY], [ ING] simultaneously.

4. It enters the CD repeat 5 limit cancel mode and displays “NO LIMIT”

5. To release this mode, press the [

CD SHIP MODE

This mode can run the CD sled motor optionally. Use this mode, for instance, when cleaning the optical pick-up.

Procedure:

1. Press the [

2. Conﬁ rm there is no disc in all trays.

3. Press the [FUNCTION] button to select CD function.

4. Press two buttons of [CD N] and [

w

5. Set to the CD ship mode. (chucking on)

6. After blink “STANDBY”, “LOCK” is displayed, disconnect the AC plug.

I/1

w

3

7

6

1

3

] button to turn the power

I/1

] button to turn the power

I/1

13942296513

] button to turn the power on.

], and [

x

] button to turn the power off.

I/1

] button to turn the power on.

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] simultaneously.

I/1

5

o

1

I/1

– TUN-

y

5

] si-

CD TRAY LOCK

This mode is for the antitheft of CD disc in shop. (not for trans-

0

port)

Procedure:

1. Press the [

2. Press the [FUNCTION] button to select CD function.

3. Insert a disc.

4. While pressing the [ seconds.

5. The message “LOCKED” is displayed and the disc tray is locked. (Even if exiting from this mode, the disc tray is still locked)

6. If press the [Z] button to eject the disc, the message “LOCKED” is displayed and can not eject the disc.

7. To release this lock, while pressing the [ [

Z

8. The message “UNLOCKED” is displayed and the disc tray is unlocked.

CD POWER MANAGE

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 [

2. Press the [FUNCTION] button to select CD function.

3. Press the [

4. After pressing the [DISPLAY] button, while pressing the [ button, press the [

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

CHANGE-OVER THE AM TUNING INTERVAL

(Except EC68: AEP, UK and Russian/EC78: AEP and

Q

Russian models)

The AM tuning interval can be changed over 9 kHz or 10 kHz.

Procedure:

1. Press the [

2. Press the [TUNER/BAND] button to select TUNER (AM) function.

3. Press the [

4. After pressing the [DISPLAY] button, while pressing the [TUNING +

5. It turns power on and display “9k STEP” or “10k STEP”, and thus the tuning interval is changed over.

CD SHIP AND COLD RESET

Procedure:

1. Press the [

2. Conﬁ rm there is no disc in all trays.

3. Press the [FUNCTION] button to select CD function.

4. Press three buttons of [PLAY MODE/TUNING MODE], [

l m

5. After blink “STANDBY”, “RESET” is displayed, disconnect the AC plug.

COMMON TEST MODE

Procedure:

1. Press the [

2. Press three buttons of [PLAY MODE/TUNING MODE], [TUNING +

3. It enters the common test mode and displays “COMMON”.

4. Each time the [VOLUME] dial is turned, “VOL MIN”, “VOL 16”, and “VOL MAX” are displayed

5. To release from this mode, press three buttons of [PLAY

u

1

6

MODE/TUNING MODE], [TUNING + PLAY] simultaneously.

I/1

] button for 5 seconds again.

I/1

7

3

I/1

– TUNING] and [

I/1

3

4

2

9

8

] button to turn the power on.

] button, press the [Z] button for more 5

x

] button to turn the power on.

] button again to turn the power off (standby).

] button.

I/1

8

0

5

1

5

1

3

6

] button to turn the power on.

] button again to turn the power off (standby).

M L

] button to turn the power on.

M L

] button, press the [

] simultaneously.

I/1

], and [DISPLAY] simultaneously.

.

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8

9

] button, press the

x

9

4

2

9

] button.

I/1

M L

], and [DIS-

2

8

9

x

2

]

9

TEL 13942296513 QQ 376315150 892498299

9

14

HCD-EC68/EC78

[CD SERVO TEST MODE]

Q

TEL 13942296513 QQ 376315150 892498299

This mode can check the servo system operations of the optical

Q

pick-up system (= optical unit + CD board).

Note1: Do not enter the [CD SERVO TEST MODE] while any other test

Note2: Do not enter any other test mode while the [CD SERVO TEST

How to Enter the CD Servo Test Mode

Procedure:

1. Press the [

2. Press the [FUNCTION] button to select CD function.

3. Press three buttons of [CD N], [

[DISPLAY] simultaneously.

4. It enters the CD servo test mode and displays “BDT S CU”.

How to Exit from the CD Servo Test Mode

Procedure:

1. Press three buttons of [CD N], [

[DISPLAY] simultaneously.

2. It releases from the CD Servo Test Mode and returns to the ordinary CD function.

Key Operation:

[

+], [ –]:

Use these keys to move between the ﬁ ve modes

TEL

[DSGX] , [EQ]: Use these keys to move between the different layers

[TUNING + Use these keys to move the cursor to the right digit

Press [TUNING +

7

3

mode is in progress.

MODE] is in progress.

13942296513

6

] button to turn the power on.

I/1

contained in the CD Servo Test Mode, that are the S-Curve Mode, the RAM Read Mode, the RAM Write Mode, the Command Out Mode and the Error Rate Mode as described below. Also, use these keys to move between the menus within the respective ﬁ ve modes. When [ vances to the next menu or to the next mode. When [ –] is pressed, the screen returns back to the previous menu or to the previous mode. Use these keys also to increase or decrease the numeric value when changing the numeric value. Pressing [ +] increases the value and pressing [ –] decreases the value.

of the hierarchy of the CD Servo Test Mode shown below. Press [DSGX] to move down to the lower layer, and press [EQ] to move up to the higher layer.

M L

], [

or to the left digit in the six-digit number, when changing the numeric value.

to the right, and press [ return the cursor to the left.

1

3

l m

+] is pressed, the screen ad-

– TUNING]:

M L

5

1

l m

– TUNING] and

] to move the cursor

– TUNING] to

5

0

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CD Servo Test Mode Tree:

S Curve Mode LD ON (BDT S CU) (LD ON)

(BDTRAM R) (DISCTYPE) (AL: 0000, RW: 0001) Gain Index value indication (GAININDX) (0001) RFO GAIN value indication (RFO_GAIN) (0009) FEO GAIN value indication (FEO_GAIN) (0005) SBAD GAIN value indication (SBAD_GAI) (0007) TEO GAIN value indication (TEO_GAIN) (000A) Disc Size value indication (DISCSIZE) (0000: Non disc, 0001: 8cm, 0002: 12cm)

(OPABRKER) (0000) SBBT Data value indication (SBBT DAT) (006C) FEOOCD value indication (FEOOCD) (0440)

(BDTRAM W) (00 SPG) (Non mask:00, Mask:01) Fix RF Gain value edit (00 FIX) (Non Fix:00, AL Fix:01, RW Fix:02) TMAX ON value edit (00 TMA) Driver Mute OFF value edit (00 D_M) (Normal:00, Forced OFF:01)

(BDT COMO) (COMOUT6X) (000000) (OK) READ2X value edit command out (READ2X) (60) (50) REG READ value edit command out (REG_READ) (00) (0000) FEBC? command out (FEBC?) (00) FGADD? command out

7

3

(FGADD?) (10) TEBC? command out (TEBC?) (00) TGADD? command out (TGADD?) (00) RFGC? command out (RFGC?) (00) FEOF? command out (FEOF?) (FFC0) TEOF? command out (TEOF?) (FFC0) TEIOCD1? command out (TEIOCD1?) (FE80) TEIOCD2? command out (TEIOCD2?) (FF40) TEIOCD3? command out (TEIOCD3?) (FFC0) TEOOCD? command out (TEOOCD?) (FD00) FEOOCD? command out (FEOOCD?) (F780) MONITOR value edit command out (MONITOR) (570A00) (OK) Error Rate Mode Error rate indication (BDT ERR) (00000000)

9

8

RAM Read Mode

RAM Write Mode

Command Out Mode

3

6

Disc Type value indication

SPG Mask value edit

COMOUT6X value edit command out

1

5

1

Higher layer Lower layer of menu hierarchy

4

2

Op ABRAKE Error

0

5

9

value indication

2

9

8

4

2

9

8

9

2

9

TEL 13942296513 QQ 376315150 892498299

9

[FUNCTION]: Use this key to execute Command Out in the Com-

mand Out Mode.

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HCD-EC68/EC78

CD SERVICE MODE

This mode can move the SLED of the optical pick-up, and also can

Q

turn the optical pick-up laser power on and off.

Procedure:

1. Press the [

2. Press three buttons of [CD N], [TUNING +

DISPLAY simultaneously.

3. Press the [FUNCTION] button to select CD function.

4. It enters the CD service mode and displays “SERVICE”.

5. To exit from this mode, press three buttons of [CD N], [TUN-

ING +

Key Operation:

[TUNING + Use these keys to move the SLED. When [TUN-

TEL 13942296513 QQ 376315150 892498299

When [

[DISPLAY]: Use this key to turn the optical pick-up laser power

CD ERROR CODE

The past errors of the CD mechanism (CDM) are displayed as the CDM Errors, and those of the optical pick-up system (= optical unit + CD board) are displayed as the BD Errors as shown below.

TEL

Procedure:

1. Press the [

2. Press the [FUNCTION] button to select CD function.

3. Press three buttons of [TUNING + PLAY] simultaneously.

4. Then, the CDM error code is displayed as “M0xxxxxx” (x means hexadecimal number) on the liquid crystal display as shown below.

5. Every pressing of the [TUNING + mode increments the number after “M” starting from “M0” up to “M9”, and then returns to “M0”. Every pressing of the [

m

after “M”. The smaller the error code number is, the newer the error content is.

6. When the [PLAY MODE/TUNING MODE] button is pressed then, the BD error code is displayed as “D0xxxxxx” (x means hexadecimal number) on the liquid crystal display as shown below. In the same way as the CDM error code, use of the [TUNING + tons in this mode enables tracing of the error history.

7. To release from this mode, press the [ power off.

I/1

M L

ING + moves to outer circumference and the message “SLED OUT” is displayed.

mode, the SLED moves to inner circumference and the message “SLED IN” is displayed.

on and off. When the laser power is turned on, the message “LD ON” is displayed. When the laser power is turned off, the message “LD OFF” is displayed.

I/1

– TUNING] button in this mode decrements the number

7

3

] button to turn the power on.

] and DISPLAY simultaneously.

], [

l m

M L

l m

6

] is pressed in this mode, the SLED

– TUNING] is pressed in this

1

3

– TUNING]:

13942296513

] button to turn the power on.

M L

] and the [

l m

I/1

– TUNING] but-

] button to turn the

5

1

5

M L

], [x] and [DIS-

] button in this

], and

l

Contents of “CDM Errors”

Error display example

0

M 0 FF 11 42 1 2 3 4

1 It indicates the error history number 0 to 9: The error code number 0 indicates the newest error.

2 It indicates whether the CDM error occurs in the normal opera-

tions or during the initialization operation. FF : The error has occurred in the normal opera-

Other than FF : The error has occurred during the initialization

3 It indicates the processing during which the trouble has oc-

curred. 01: The disc EJECT processing is in progress. 02: The disc INSERTION-WAITING processing is in prog-

ress.

03: Processing of the disc INSERTION-REQUEST for the up-

per CD tray is in progress.

04: Processing of the disc EJECTION-REQUEST for the up-

per CD tray is in progress. 05: The disc pulling-in operation is in progress. 06: The disc chucking processing is in progress. 07: The disc re-chucking processing is in progress. 08: The disc chucking-release completion operation is in prog-

ress.

4 It indicates the operation during which the trouble has oc-

curred. 00 : Waiting for the operation.

7

3

Q

10 to 13 : The disc EJECT operation is in progress. 20 : The disc pulling-in operation is in progress. 30 : The disc chucking-release operation is in progress. 40 to 43 : The disc EJECT operation due to error is in prog-

ress.

Contents of “BD Errors”

Error display example

0 02 09

D 1 2 3 4

1 It indicates the error history number 0 to 9: The error code number 0 indicates the newest error.

2 It indicates the error content

01: The focus servo cannot lock-in. 02: GFS is no good (NG). 03: The startup time exceeds the speciﬁ ed period of time (time

over) 04: The focus servo is unlocked continuously. 05: Q code cannot be obtained within the speciﬁ ed period of

time. 06: The tracking servo cannot lock-in. 07: Blank disc

8

6

3

01

9

tions.

operation.

5

1

2

1

5

4

0

9

8

9

8

2

4

2

9

8

9

2

9

TEL 13942296513 QQ 376315150 892498299

9

16

w

.

xia

o

y

u

1

6

3

.

c

o

m

HCD-EC68/EC78

3 It indicates the on-going processing of optical pick-up system

Q

TEL 13942296513 QQ 376315150 892498299

(= optical unit + BD board) when the trouble has occurred.

Q

01: The CD SHIP mode processing is in progress. 02: The POWER OFF processing is in progress. 03: The INITIALIZE processing is in progress. 04: The optical pick-up system (= optical unit + BD board) is

05: The STOP operation is in progress. 06: The startup processing is in progress. 07: The TOC read-in processing is in progress. 08: The SEARCH operation is in progress. 09: The PLAY operation is in progress. 0A: The PAUSE operation is in progress. 0B: The PLAY – MANUAL SEARCH operation is in prog-

0C: The PAUSE – MANUAL SEARCH operation is in prog-

4 It indicates the operation that is being processed when the trou-

ble has occurred.

It indicates the step number of each processing speciﬁ ed by 3.

Because the numbers of steps are different in each processing, this number is different in each processing.

CD FACTORY MODE

Note1: Do not enter the [CD FACTORY MODE] while any other test-

Note2: Do not enter any other test mode while the [CD FACTORY

7

3

in the stop state.

ress.

mode is in progress.

MODE] is in progress.

6

3

1

5

1

5

0

Key Operation:

[DISPLAY]: The display changes in the following order when-

[DSGX]: RF gain setting changes whenever the button is

“–”: No gain ﬁ xation. “AL”: Fix to the gain for AL disc. “RW”: Fix to the gain for RW disc.

[EQ]: Tracking servo setting changes whenever the but-

“ON”: Tracking servo ON. “OFF”: Tracking servo OFF.

[FUNCTION]: S character mode setting changes whenever the but-

“ ”: S character mode OFF. “S”: S character mode ON.

8

4

2

9

ever the button is pressed.

(Initial display)

fcsAG ** (**: Focus AGC value)

trkAG ** (**: Track AGC value)

RF-AG ** (**: RF AGC value)

pressed.

ton is pressed.

9

8

2

9

TEL 13942296513 QQ 376315150 892498299

Procedure:

1. Press the [

TEL

13942296513

2. Press the [FUNCTION] button to select CD function

3. Press three buttons of [CD N], [FUNCTION], and [DIS-

PLAY] simultaneously.

4. It enters the CD factory mode and displays the following message.

–X1ON

S character mode setting Tracking servo setting RF gain setting

] button to turn the power on.

I/1

Q

5. To release from this mode, press the [

3

power off.

6

7

3

1

5

1

5

0

8

9

2

] button to turn the

I/1

2

8

9

4

9

w

.

xia

o

y

u

1

6

3

.

c

o

m

17

HCD-EC68/EC78

SECTION 5

MECHANICAL ADJUSTMENTS

SECTION 6

ELECTRICAL ADJUSTMENTS

PRECAUTION

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

Q

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

2. Demagnetize the record/playback head with a head demag-

netizer. (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

TEL 13942296513 QQ 376315150 892498299

Mode Torque Meter Meter Reading

FWD CQ-102AS

FWD Back Tension

FF CQ-201AS

REV CQ-201B

3

7

6

CQ-102C

1

3

(0.28 – 1.12 oz • inch)

(0.021 – 0.083 oz • inch)

5

2.0 – 8.0 mN • m (20 to 80 g • cm)

0.15 – 0.6 mN • m (1.5 to 6 g • cm)

5 – 17.7 mN • m

(50 to 177 g • cm)

(0.7 – 2.48 oz • inch)

5 – 17.7 mN • m

(50 to 177 g • cm)

(0.7 – 2.48 oz • inch)

1

5

DECK SECTION (EXCEPT EC68: UK model) 0 dB = 0.775V

0

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

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

TEST TAPE

Tape Signal Used for

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

RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT

Note: Perform this adjustments for both decks.

Procedure:

1. Mode: Playback

test tape P-4-A063 (6.3 kHz, −10 dB)

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.

8

set

2

9

JACK board PHONES jack (J492)

4

level meter

+ –

9

8

2

9

TEL 13942296513 QQ 376315150 892498299

• Tape Tension Measurement

Mode Tension Meter Meter Reading

TEL

FWD CQ-403A

13942296513

(more than 2.82 oz)

more than 80 g

L-CH

7

3

Q

peak

R-CH

Screw position

3. Mode: Playback

test tape P-4-A063 (6.3 kHz, −10 dB)

peak

set

waveform of oscilloscope

1

3

6

Output level

JACK board PHONES jack (J492)

within

1

5

1dB

5

L-CH peak

8

0

R-CH peak

oscilloscope

V

9

H

2

4

within 1dB

Screw position

9

8

2

9

18

w

.

xia

in phase 45° 90° 135° 180°

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

o

y

u

1

6

3

good

.

c

wrong

o

m

HCD-EC68/EC78

Adjustment Location: Record/Playback/Erase Head

7

Q

TEL 13942296513 QQ 376315150 892498299

3

6

3

1

5

1

5

0

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 speciﬁ ed value with the following checks.

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

FOCUS BIAS CHECK

CD board

TP121 (RFI)

TP124 (VC)

Procedure :

1. Connect the oscilloscope to TP121 (RFI) and TP124 (VC) on the CD board.

2. Press the [I/1] button to turn the power ON, and press the [Z] button to open the CD disc tray.

3. Set disc (YEDS-18) on the trey and press the [CD N] button to playback.

4. Conﬁ rm that oscilloscope waveform is as shown in the ﬁ gure below. (eye pattern)

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

center of the waveform can be clearly distinguished.

8

9

4

2

oscilloscope

(DC range)

+ –

9

2

8

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

9

TEL 13942296513 QQ 376315150 892498299

TEL

13942296513

Q

0

5

1

5

1

3

6

7

3

Checking Location:

– CD Board (Conductor Side) –

TP124

(VC)

TP121

(RFI)

IC101

8

9

4

2

level:

1.2 ± 0.3 Vp-p

9

8

2

9

w

.

xia

o

y

u

1

6

3

.

c

o

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19

Sony HCD-EC68,HCD-EC78 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TABLE OF CONTENTS

SERVICING NOTES

GENERAL

DISASSEMBLY

3-1. DISASSEMBLY FLOW

3-2. SIDE PANEL (L)/(R)

3-3. TOP PANEL (EC68: UK MODEL)/TOP PANEL BLOCK (EXCEPT EC68: UK MODEL)

3-4. TAPE MECHANISM DECK (EXCEPT EC68: UK MODEL)

3-5. MAIN BOARD

3-6. FRONT PANEL SECTION

3-7. BACK PANEL BLOCK

3-8. CD MECHANISM BLOCK

3-9. BU BLOCK

3-10. OP BASE ASSY (KSM-213D)

TEST MODE

MECHANICAL ADJUSTMENTS

ELECTRICAL ADJUSTMENTS