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25

Function

MD N X

x

M 

m

PLAY MODE/DIRECTION

REC MODE

MD Z

REPEAT

CLEAR“R”

1.

Entering the continuous playback mode

(1) Set the disc in the unit. (Whichever recordable discs or discs for playback only are available)
(2) Press the

.

 

“R” or

>

 

“R” button to display “CPLAY 1MODE” (C34).

(3) Press the ENTER/YES “R” button to change the display to “CPLAY1MID”.
(4) When access completes, the display changes to “C = 

 AD = 

)”.

 The numbers “ ” displayed show you error rates and ADER.

2.

Changing the parts to be played back

(1) Press the ENTER/YES “R” button during continuous playback to change the display as below.

When pressed another time, the parts to be played back can be moved.

(2) When access completes, the display changes to “C = 

 AD = 

)”.

 The numbers “ ” displayed show you error rates and ADER.

3.

Ending the continuous playback mode

(1) Press the MENU/NO “R” button. The display will change to “CPLAY 1MODE” (C34).
(2) Press the Z (MD) button and take out the disc.

 The playback start addresses for IN, MID, and OUT are as follows.

IN

: 40h cluster

MID : 300h cluster
OUT : 700h cluster

1.

Entering the continuous recording mode

(1) Set a recordable disc in the unit.
(2) Press the

.

 

“R” or 

 >

 

“R” button to display “CREC 1MODE” (C35).

(3) Press the ENTER/YES “R” button to change the display to “CREC 1MID”.
(4) When access completes, the display changes to “CREC 1(

)” and “ MD ” lights up.

 The numbers “ ” displayed shows you the recording position addresses.

2.

Changing the parts to be recorded

(1) When the ENTER/YES “R” button is pressed during continuous recording, the display changes as below.

When pressed another time, the parts to be recorded can be changed. “

 

MD ” goes off.

(2) When access completes, the display changes to “CREC 1(

)” and “

 

MD ” lights up.

 The numbers “ ” displayed shows you the recording position addresses.

3.

Ending the continuous recording mode

(1) Press the MENU/NO “R” button. The display changes to “CREC 1MODE” (C35) and “ 

 

MD ”  goes off.

(2) Press the Z (MD) button and take out the disc.

 The recording start addresses for IN, MID, and OUT are as follows.

IN

: 40h cluster

MID

: 300h cluster

OUT

: 700h cluster

 The MENU/NO “R” button can be used to stop recording anytime.

 Do not perform continuous recording for long periods of time above 5 minutes.

 During continuous recording, be careful not to apply vibration.

“CPLAY 1MID” t “CPLAY 1OUT” t “CPLAY 1IN”  

“CREC 1MID” t “CREC 1OUT” t “CREC 1IN”  

Contents

Sets continuous playback when this is pressed in the STOP state. When this is pressed during continu-
ous playback, tracking power servo turns ON/OFF.

Stops continuous playback and continuous recording

The sled moves to the outer circumference only when this is pressed

The sled moves to the inner circumference only when this is pressed

Switches the spindle servo mode (CLV S y CLV A)

Switches the pits or grooves each time the button is pressed

Ejects the disc

Releases the test mode

Clears the setting of pits and groove, and judges pits and groove again.

When it is pressed while servo is turning on, the recording starts from present position.

z MD

26

This test mode performs CREC and CPLAY automatically for mainly checking the characteristics of the optical pick-up.
To perform this test mode, the laser power must first be checked.
Perform AUTO CHECK after the laser power check and Iop Compare.

1.

Press the ENTER/YES “R” button. If “LDPWR 

 ” is displayed, it means that the laser power check has not been performed.

In this case, perform the laser power check and Iop Compare (C27), and then repeat from step1.

2.

If a disc is in the mechanical deck, it will be ejected forcibly.
“DISC IN” will be displayed in this case. Load a test disc (MDW-74/GA-1) which can be recorded.

3.

If a disc is loaded at step 2, the check will start automatically.

4.

When “XX CHECK” is displayed, the item corresponding to XX will be performed.
When “06 CHECK” completes, the disc loaded at step 2 will be ejected. “DISC IN” will be displayed. Load the check disc (TDYS-1).

5.

When the disc is loaded in step 4, the check will automatically be resumed from “07 CHECK”.

6.

After completing to “12 CHECK”, check OK or NG will be displayed. If all items are OK, “CHK ALL OK” will be displayed. If any
item is NG, it will be displayed as “NG:xxxx”.

When “CHK ALL OK” is displayed, it means that the optical pick-up is normal. Check the operations of other parts (spindle motor, sled
motor, etc.).
When displayed as “NG:xxxx”, it means that the optical pick-up is faulty. In this case, replace the optical pick-up.

27

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

parts adjusted.

3. Mode: Playback

test tape
P-4-A100
(10kHz, –10dB)

oscilloscope

set

Waveform of oscilloscope

in phase

45

°

90

°

135

°

180

°

good

wrong

GND

R-ch

L

R

J301
 PHONES
Output Terminal

32 

Ω

32 

Ω

1. MODE : Playback.

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

J301
 PHONES
Output Terminal

frequency
counter

set

32 

Ω

(Top view)

Adjustment point

2. Insert the WS-48B into deck.
3. Press the  Y  button of deck.
4. Check the reading of frequency counter becomes 3000 

±

 90 Hz.

W.RMS (JIS) less than 0.3%
(test tape: WS-48B)

 Standard Volume Point is –10 dBs at PHONES Output Level (32

Ω

load resistance) during playbacking P-4-L300 Test Tape.
(DSG OFF, TREBLE/BASS CENTER)

Procedure:
1. Mode : Playback

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 1 dB of peak.

L-CH
peak

R-CH
peak

screw
position

output
level

within
1 dB

L-CH
peak

R-CH
peak

screw
position

within 1dB

1. Demagnetize the record/playback head with a head demagne-

tizer.

2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the

parts adjusted.

4. The adjustments should be performed with the rated power sup-

ply voltage unless otherwise noted.

5. The adjustments should be performed in the order given in this

service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit ad-
justment.)

6. The adjustments should be performed for both L-CH and R-

CH.

7. Switches and controls should be set as follows unless other-

wise specified.

test tape
P-4-A100
(10kHz, –10dB)

J301
 PHONES
Output Terminal

level meter

set

+

–

32 

Ω

Tape

P-4-A100

WS-48B

P-4-L300

10 kHz, –10 dB

3 kHz, 0 dB

315 Hz, 0 dB

Azimuth Adjustment

Tape Speed Adjustment

Level Adjustment

Signal

Used for

28

Note :

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

Therefore, check each item in order given.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M

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.

Procedure :
1. Connect oscilloscope to TP (RFAC).
2. Turn the power on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal

level is correct or not.

Clear RF signal waveform means that the shape “

◊

” can be

clearly distinguished at the center of the waveform.

Procedure:
1. Connect oscilloscope to TP (TE) and TP (DVC 1.65V).
2. Turn the power on.
3. Load a disc (YEDS-18) and playback the number five track.
4. Press the  u  button. (Becomes the 1track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope

waveform.

Specification level:      

                x

 100=less than 

±

22%

TP(RFAC)

TP(DVC 1.65V)

CD BOARD

oscilloscope

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

level : 1.1 

±

 0.3Vp-p 

CD BOARD

Oscilloscope

TP(TE)

TP(DVC 1.65V)

0V

Center of
waveform

B

Symmetry

A (DC voltage)

B=1.3 

±

0.6Vp-p

1. Press  FUNCTION  button to select ANALOG IN.
2. Insert a tape into deck, press the  z TAPE  button, and then press

the  X  TAPE   button to start recording.

3. Mode: Record

4. Mode: Playback

5. The playback output  level should be –2 

±

4 dBs (60 Hz),

–1 

±

4 dBs (8 kHz) and –3 

±

4 dBs (10 kHz) compared with 315Hz

playback level.

AF OSC

     PJ301
ANALOG IN
1) 315 Hz
2) 60 Hz
3) 5 kHz
4) 10 kHz

blank tape
CS-123

set

attenuator

600 

Ω

109 mV (–17 dB)

recorded
position

level meter

set

32 

Ω

J301
 PHONES

1.3

±

0.6Vp-p

 A