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17

• This mode is used to check operations of the amplifier.
Procedure:
1. Press the

?/1

key to turn the power ON.

2. Press three keys of 

[VOLUME-]

,

x

and

?/1

simultaneously.

3. When the MC test mode is activated, “MIN” is displayed on the

liquid crystal display.

4. Press the 

[VOLUME+]

 key, “MAX” is displayed on the liquid

crystal disply.
Press the 

[VOLUME-]

 key, “MIN” is displayed.

5. To release this mode, press the

?/1

key.

• This mode is used to check the liquid crystal display, LED,

model, destination, software version and key.

Procedure:
1. Press the

?/1

key to turn the power ON.

2. Press three keys of 

[VOLUME+]

,

x

and

?/1

simultaneously.

3. Liquid crystal display and LED are all turned on.
4. When you want to enter the model, destination and version

display mode, press the 

u

 key. The model and destination

are displayed alternately on the liquid crystal display.

5. Each time the 

u

  key is pressed, the MC version or CD

version is displayed on the liquid crystal display.

6. When the 

>

 key is pressed while the version numbers are

being displayed except model and destination, the year, month
and day of the software creation are displayed. When the 

>

key is pressed again, the display returns to the software version
display. When the 

u

 key is pressed while year, month and

day of the software creation are being displayed, the year, month
and day of creation of the software versions are displayed on
the liquid crystal display in the same order of version display.

7. Press the 

.

 key, the key check mode is activated.

8. In the key check mode, “K

0

” is displayed on the liquid crystal

display. Each time a key is pressed, “K” value increases.
However, once a key is pressed, it is no longer taken into account.

9. To release this mode, press three keys in the same manner as

step 2, or disconnect the power cord.

• 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

?/1

key to turn the power ON.

2. Press three keys of 

[FUNCTION]

,  

x

  and

?/1

simultaneously.

3. The liquid crystal display becomes blank instantaneously, and

the set is reset.

• This mode is used to unable to take sample disc out of tray in

the shop.

Procedure:
1. Press the

?/1

key to turn the power ON.

2. Press the 

[FUNCTION]

 key to select “CD”.

3. While pressing the

Z

  key, press the

x

  key for 5 seconds.

4. The message “LOCK” is displayed on the liquid crystal display

and the tray is locked. (Even if pressing the

Z

  key, the message

“LOCK” is displayed on the liquid crystal display and the tray
is locked)

5. To release from this mode, pressing the

Z

  key, press the  

x

key for 5 seconds.

6. The message “FREE” is displayed on the liquid crystal display

and the tray is unlocked.

• This mode can run the CD sled motor freely. Use this mode, for

instance, when cleaning the optical pick-up.

Procedure:
1. Press the

?/1

key to turn the power ON.

2. Press the 

[FUNCTION]

 key to select “CD”.

3. Press three keys of 

x

, 

[DIMMER]

  and 

[FUNCTION]

simultaneously.

4. Press the

>

key to move the optical pick-up to outside track,

or press the   

.

key to inside track.

5. To release this mode, press the

?/1

key.

• This mode can be used for operation check of CD section.
If an error occurred:

The aging operation stops only an error occurred.

The aging operation continues repeatedly.

Procedure:
1. Press the

?/1

key to turn the power ON.

2. Press the 

[FUNCTION]

 key to select “CD”.

3. Set disc on the tray.
4. Press three keys of 

[VOLUME-]

, 

 u

  and

?/1

simultaneously.

5. Aging operation of CD is started.
6. To release this mode, press the

?/1

key.

The sequence during the aging mode is following as below.
Display at the aging mode is the same as the normal operation.

Start

Disc chucking

TOC read

Play first track for 2 seconds

Play last track for 2 seconds

Open the disc tray

Close the disc tray

18

• Number of repeat for CD playback is 5 times when the repeat

mode is “REPEAT”. This mode is used to enables CD to repeat
playback for limitless times.

Procedure:
1. Press the

?/1

key to turn the power on.

2. Press the 

[FUNCTION]

 key to select “CD”.

3. Press three keys of 

[VOLUME+]

, 

 x

  and 

[DIMMER]

simultaneously.

4. When the 5 repeat off mode is activated, “REP” blinks on the

liquid crystal display.

• This mode is used to enable function name of external input and

output to change over PC, MD or TAPE.

Procedure:
1. Press the

?/1

key to turn the power on.

2. Press the 

[FUNCTION]

  key repeatedly until “PC”, “MD” or

“TAPE” appears.

3. While pressing and holding the

x

    key,  press the

?/1

key

repeatedly until the desired function name (PC, MD or TAPE)
appears.

19

19

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 M

Ω

 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.

Procedure :
1.

Connect oscilloscope to TP (RFAC) and TP (VC) on the BD
board.

2.

Press the

?/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 tray and press the

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.

s

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

level:
0.9 

±

 0.4 Vp-p

TP

(RFAC)

TP

(VC)

IC103

IC102

IC101

20

20

BD board

REG board

POWER board

CONTROL board

JACK board

REMOCON board

LOADING board

PANEL board

Note:
• All capacitors are in µF unless otherwise noted.  pF: µµF

50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in 

Ω

 and 

1

/

4

 

W or less unless otherwise

specified.

•

f

: internal component.

•

2

: nonflammable resistor.

•

1

: fusible resistor.

•

C

: panel designation.

• X

: parts extracted from the component side.

• Y

: parts extracted from the conductor side.

•

f

: internal component.

•

a

: Through hole.

•

: Pattern from the side which enables seeing.

•

A

: B+ Line.

•

B

: B– Line.

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.
no mark : FM
(

) : CD PLAY

<

> : CD STOP

∗

: Impossible to measure

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

Voltage variations may be noted due to normal produc-
tion tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc-
tion tolerances.

• Circled numbers refer to waveforms.

• Signal path.

F

: TUNER

J

: CD

d

: LINE

Caution:
Pattern face side: Parts on the pattern face side seen from the
(Conductor Side) pattern face are indicated.
Parts face side:

Parts on the parts face side seen from the

(Component Side) parts face are indicated.

B

These are omitted.

C

E

Q

C

B

These are omitted.

E

Q

B

These are omitted.

C

E

Q

Note:
The components identi-
fied by mark 

0

 or dotted

line with mark 

0

 are criti-

cal for safety.
Replace only with part
number specified.