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3

................................................

4

...................................................................

6

3-1.

Disassembly Flow ...........................................................

8

3-2.

Side Panel (R), Side Panel (L) .........................................

9

3-3.

Top Panel Assy (Except US, CND) ................................. 10

3-4.

Top Panel (US, CND) ...................................................... 10

3-5.

Front Panel Assy .............................................................. 11

3-6.

Mechanical Deck (Except US, CND) .............................. 12

3-7.

Belt (MAIN), Belt (R/F) (Except US, CND) .................. 12

3-8.

KEY-LEFT Board ............................................................ 13

3-9.

KEY-RIGHT Board, KEY-CD Board, PANEL Board .... 13

3-10. JACK Board ..................................................................... 14
3-11. MAIN Board .................................................................... 15
3-12. CD Mechanical ................................................................ 16
3-13. Optical Pick-up (KSM-213DCP), BD90 Board .............. 17
3-14. Belt (DLM3A) ................................................................. 18
3-15. Chassis ............................................................................. 18
3-16. PT Board (Except EC55:US, CND),

PT (U) Board (EC55:US, CND), Power Transformer ..... 19

3-17. LOW-AMP Board, HI-AMP Board (EC77/GX99) ......... 19
3-18. HI-AMP Board (EC55) ................................................... 20
3-19. DC Fan ............................................................................ 20

............................................................... 21

......................... 25

.......................... 25

7-1.

Block Diagram — BD/DRIVER Section — .................. 30

7-2.

Block Diagram — TUNER Section — .......................... 31

7-3.

Block Diagram — MAIN Section — ............................. 32

7-4.

Printed Wiring Board — BD90 Board — ...................... 33

7-5.

Schematic Diagram — BD90 Board — ......................... 34

7-6.

Printed Wiring Boards — MAIN Section — ................. 35

7-7.

Schematic Diagram — MAIN Section (1/2) — ............. 36

7-8.

Schematic Diagram — MAIN Section (2/2) — ............. 37

7-9.

Printed Wiring Board — PANEL Board — ................... 38

7-10. Schematic Diagram — PANEL Board — ...................... 39
7-11. Printed Wiring Boards — KEY Section — .................... 40
7-12. Schematic Diagram — KEY Section — ........................ 40
7-13. Printed Wiring Board — HI-AMP Board — .................. 41
7-14. Schematic Diagram — HI-AMP Board — .................... 42
7-15. Printed Wiring Board

— LOW-AMP Board (EC77/GX99) — .......................... 43

7-16. Schematic Diagram

— LOW-AMP Board (EC77/GX99) — .......................... 44

7-17. Printed Wiring Boards

— DECK Section (Except US,CND) — ......................... 45

7-18. Schematic Diagram

— DECK Section (Except US,CND) — ......................... 45

7-19. Printed Wiring Board

— PT Board (Except EC55: US,CND) — ...................... 46

7-20. Schematic Diagram

— PT Board (Except EC55: US,CND) — ...................... 46

7-21. Printed Wiring Board

— PT (U) Board (EC55: US,CND) — ............................ 47

7-22. Schematic Diagram

— PT (U) Board (EC55: US,CND) — ............................ 47

8-1.

Overall Section ................................................................ 57

8-2.

Front Panel Section ......................................................... 58

8-3.

Chassis Section (EC77/GX99) ........................................ 59

8-4.

Chassis Section (EC55) ................................................... 60

8-5.

Top Section (Except US, CND) ....................................... 61

8-6.

CD Mechanism Deck Section ......................................... 62

.................................. 63

4

•

Never reuse a disconnected chip component.

•

Notice that the minus side of a tantalum capacitor may be
damaged by heat.

•

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.

After correcting the original service problem, perform the following
safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage.
Check leakage as described below.

The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers’ instructions to use these
instruments.

2. A battery-operated AC milliammeter. The Data Precision 245

digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a

VOM or battery-operated AC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples
of a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2 V AC range are suitable.  (See
Fig. A)

1.5 k

Ω

0.15 

µ

F

AC
voltmeter
(0.75 V)

To Exposed Metal
Parts on Set

Earth Ground

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

Boards requiring use of unleaded solder are printed with the lead-
free 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)

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.

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.

The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.

Carry out the “S curve check” in “CD section adjustment” and check
that the S curve waveforms is output three times.

This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior. (Except for Korean model)

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

Remove all discs to protect the CD mechanism.

Hold down CD 

u

 (play/pause) on the unit, and press 

?/1

 until “STANDBY” appears.

After “LOCK” appears, unplug the power cord.

5

B

gear

tray

flathead screwdriver

bottom rib

A

Turn the bottom rib (not the gear) with a flathead screwdriver in the direction of arrow A, and 
draw out the tray in the direction of arrow B.

6

This section is extracted
from instruction manual.

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

ȶ

.

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

DSGX

Ȱ

 on the unit.

Set the sound effect

EQ

Ȱ

.

To turn on the subwoofer 
Press SUBWOOFER ON/OFF in the lower part of the 
subwoofer until the indicator on the subwoofer lights up.

* To adjust the sound output level for the subwoofer, turn the 

SUBWOOFER LEVEL in the lower part of the subwoofer. Once you 
have made the adjustment, the overall sound level can be adjusted 
using VOLUME +/– on the remote (or turn the VOLUME control 
on the unit) ȶ.

Select the CD function.
Press CD on the remote (or FUNCTION repeatedly) 

Ȭ

.

Place a disc.
Press ì (open/close) 

ȱ

 on the unit, and place a 

disc with the label side up on the disc tray. To place 
additional discs, slide the disc tray with your finger as 
shown below.
To close the disc tray, press ì (open/close) 

ȱ

 on the 

unit.
Do not force the disc tray closed with your finger, as 
this may damage the unit.

Select a disc.
If the discs are currently stopped, press DISC SKIP on 
the remote (or DISC SKIP/EX-CHANGE on the unit) 

ȳ

. To change discs while in other functions, press 

DISC 1 – 3 

Ȳ

 on the unit.

Start playback.
Press à (play) (or CD ā (play/pause) on the unit) 

Ȭ

.

To exchange other discs during playback, press DISC 
SKIP/EX-CHANGE 

ȳ

 on the unit. 

Pause playback

ê

 (pause) on the remote (or CD 

ā

 on the unit) 

Ȭ

. To resume 

play, press the button again.

Stop playback

Ą

 (stop) 

ȭ

.

Select a folder on an 
MP3 disc

 +/– 

ȯ

.

Select a track or file

ÃÄÑ

 (go back/go forward) 

on the remote (øÄÞ on the 
unit) 

ȭ

.

Find a point in a 
track or file 

Hold down ù/ß (rewind/fast 
forward) 

ȭ

 during playback, and 

release the button at the desired 
point.

Select Repeat Play

REPEAT 

Ȯ

 on the remote 

repeatedly until “REP” or “REP1” 
appears.

To change the play mode
Press PLAY MODE 

Ȯ

 repeatedly while the player is 

stopped. You can select normal play (no display for all 
discs or “1 DISC” for a disc or “

” for all MP3 files 

in the folder on the disc), shuffle play (“SHUF” for 
all discs shuffle, “1 DISC SHUF” for one disc shuffle 
or “

SHUF*” for folder shuffle), or program play 

(“PGM”).

* When playing a CD-DA disc, 

 (SHUF) Play performs the same 

operation as 1 DISC (SHUF) Play.

ˎ

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

ˎ

You cannot select “REP” and “SHUF” (all discs shuffle) at the same 
time.

ˎ

“REP1” indicates that a single track or file is repeated until you stop 
it.

ˎ

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

ˎ

Folders that have no MP3 files are skipped.

ˎ

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

ˎ

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

ˎ

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.

ˎ

The maximum number of:
ˋ

loadable sessions on a single disc is 10.

ˋ

folders is 150 (including the root folder).

ˋ

MP3 files is 255.

ˋ

MP3 files and folders that can be contained on a single disc is 300.

ˋ

folder levels (the tree structure of files) is eight.

ˎ

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.

ˎ

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.

ˎ

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

Select “FM” or “AM.”
Press TUNER/BAND 

Ȭ

 repeatedly.

Select the tuning mode.
Press TUNING MODE 

Ȯ

 repeatedly until “AUTO” 

appears. 

Tune in the desired station.
Press +/– on the remote (or TUNING + or – on the 
unit) 

ȭ

.

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

To stop automatic scanning
Press Ą (stop) 

ȭ

.

To tune in a station with a weak signal
If “TUNED” does not appear and the scanning does 
not stop, press TUNING MODE 

Ȯ

 repeatedly until 

“MANUAL” appears and press +/– on the remote (or 
TUNING + or – on the unit) 

ȭ

 repeatedly to tune in the 

desired station.

station
Press FM MODE 

Ȯ

 on the remote repeatedly until 

“MONO” appears to turn off stereo reception.

Select a tape function.
Press TAPE on the remote (or FUNCTION on the 
unit repeatedly) 

Ȭ

.

Insert a tape.
Press Ąì (stop/eject) 

ȫ

 on the unit, and insert the 

tape into the cassette holder. Make sure there is no 
slack in the tape to avoid damaging the tape or the 
tape deck.

Start playback.
Press à (play) 

ȫ

 on the unit. 

Pause playback

ê

 (pause) 

ȫ

 on the unit. To resume 

play, press the button again.

Stop playback

Ąì

 (stop/eject) 

ȫ

 on the unit.

Rewind or fast 
forward*

ù

/ß

ȫ

 on the unit.

* Be  sure  to press Ąì (stop/eject) ȫ on the unit after the tape has 

been wound or rewound to the end.

Do not turn off the system during playback or recording.

Change 
information on the 
display*

DISPLAY 

̢

 repeatedly when the 

system is turned on.

Change Display 
mode (See below.)

DISPLAY 

̢

 repeatedly when the 

system is turned off.

* 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 
playing time while the player is stopped.

The system offers the following display modes.

Power Saving 
Mode

2)

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

Clock

3)

The clock is displayed.

1)

The STANDBY indicator ̣ on the unit lights up when the system is 
off.

2)

You cannot set the clock in Power Saving Mode.

3)

The clock display automatically turns to Power Saving Mode after 
eight seconds. 

ˎ

Characters that cannot be displayed appear as “_”.

ˎ

The following are not displayed;
ˋ

total playing time for an MP3 disc.

ˋ

remaining playing time for an MP3 file.

ˎ

The following are not displayed correctly;
ˋ

elapsed playing time of an MP3 file encoded using a VBR (variable 
bit rate).

ˋ

folder and file names that do not follow either the ISO9660 Level 
1, Level 2 or Joliet in the expansion format.

ˎ

The following are displayed;
ˋ

total playing time for a CD-DA disc when the play mode is “1 
DISC”.

ˋ

remaining playing time for a track.

ˋ

ID3 tag information for MP3 files 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 file).

ˋ

up to 15 characters of ID3 tag information using uppercase letters 
(A to Z), numbers (0 to 9), and symbols (‘< > * + , – / @ [ \ ] _).

* Except for North American model

To use the remote
Slide and remove the battery compartment lid 

Ȼ

, and 

insert the two R6 (size AA) batteries (supplied), × side 
first, matching the polarities shown below. 

ˎ

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

ˎ

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

ˎ

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

ˎ

Batteries installed devices shall not be exposed to excessive heat such 
as sunshine, fire or the like.

Turn on the system.
Press ÒÄÆ (on/standby) 

ȩ

.

Select the clock set mode.
Press CLOCK/TIMER SET 

ȹ

 on the remote. If the 

current mode appears on the display, press Ã/Ñ

ȭ

 on the remote repeatedly to select “CLOCK,” and 

then press ENTER 

Ⱥ

 on the remote.

Set the time.
Press Ã/Ñ

ȭ

 on the remote repeatedly to set 

the hour, and then press ENTER 

Ⱥ

 on the remote. 

Use the same procedure to set the minutes.
The clock settings are lost when you disconnect the 
power cord or if a power failure occurs.

Press the following buttons (or press FUNCTION 

Ȭ

repeatedly).

CD

CD

Ȭ

 on the remote.

Tuner

TUNER/BAND 

Ȭ

.

Tape

1)

TAPE 

Ȭ

 on the remote.

Component

2)

 (connected 

using an audio cord)

FUNCTION repeatedly 
(or AUDIO IN

3)

 on 

the remote) 

Ȭ

 until 

“AUDIO IN” appears.

1)

Except for North American model.

2)

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

3)

North American model only.

*