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17

For the mechanism desk check mode, two modes of the disc table mode and the loading mode are available.
In the mechanism deck check mode, the disc table rotating time and the loading time in each section are measured and displayed.

Procedure:
1. Press the 

[POWER]

 button while pressing three buttons of  H , 

[    OPEN/CLOSE]

, and 

[REPEAT]

 simultaneously.

2. Start the table mode, and turn to right then turn to left, and display rotating time as follows.

3. To release from this mode, press the 

[POWER]

 button to turn OFF the power.

Procedure:
1. Press the 

[POWER]

 button while pressing three buttons of H , 

[    OPEN/CLOSE]

, and 

[TIME/TEXT]

 simultaneously.

2. Start the loading mode and display as follows.

Operation

Display

Start

START

– –. –

Open and close

CLOSE

1.9

BU up

BU UP

0.5

EX open

EX OPEN

1.9

EX close

EX CLOSE 2.2

BU down

BU DOWN 0.4

Open

OPEN

1.7

3. To change the display, turn the 

[       AMS       ]

 knob.

4. To release from this mode, press the 

[POWER]

 button to turn OFF the power.

A

A

l

L

R 5 . 7   L 5 . 8

18

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

fore, check each item in order given.

2. Use PATD-012 disc (4-225-203-01) 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.

Set the test disc (PATD-012). Disc chucking operation is
complete, then press the 

[POWER]

 button to turn the power

off.

2.

Connect an oscilloscope to test point TP (FE1) and TP (VC)
on the BD board.

3.

Connect between test point TP (ADJ) on the MAIN board and
GND by lead wire.

4.

Press the  

[POWER]

 button to turn the power on and enter the

ADJ mode.
Then playback the number two track automatically, press the

x

button to stop the playback.

5.

Press the  

[CHECK]

 button actuate the focus search. (actuate

the focus search when disc table is moving in and out)

6.

Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 2 ± 1
Vp-p.

S-curve waveform

 • Try to measure several times to make sure than the ratio of A : B

or B : A is more than 10 : 7.

• Take sweep time as long as possible and light up the

brightness to obtain best waveform.

Checking Location: BD board

+
–

BD board

TP (FE1)

TP (VC)

oscilloscope

A

B

symmetry

within 2 

±

 1 Vp-p

+
–

BD board

TP (RFDC)

TP (VC)

oscilloscope

VOLT/DIV: 200 mV
TIME/DIV: 500 ns 

level: 1.15 

±

 0.35 Vp-p

VC

Procedure:
1.

Set the test disc (PATD-012). Disc chucking operation is
complete, then press the 

[POWER]

 button to turn the power

off.

2.

Connect an oscilloscope to test point TP (RFDC) and TP (VC)
on the BD board.

3.

Connect between test point TP (ADJ) on the MAIN board and
GND by lead wire.

4.

Press the  

[POWER]

 button to turn the power on and enter the

ADJ mode, then playback the number two track automatically.

5.

Confirm that oscilloscope waveform is clear and check the level
of between RFDC top and VC is correct or not.

A clear RFDC signal waveform means that the shape “

◊

” can be

clearly distinguished at the center of the waveform.

       RFDC signal waveform

Checking Location: BD board

Procedure:
1.

Set the test disc (PATD-012). Disc chucking operation is
complete, then press the 

[POWER]

 button to turn the power

off.

2.

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

3.

Connect between test point TP (ADJ) on the MAIN board and
GND by lead wire.

4.

Press the  

[POWER]

 button to turn the power on and enter the

ADJ mode, then playback the number two track automatically.

5.

Confirm that oscilloscope waveform is clear and check RFAC
signal level is correct or not.

A clear RFAC signal waveform means that the shape “

◊

” can be

clearly distinguished at the center of the waveform.

       RFAC signal waveform

Checking Location: BD board

+
–

BD board

TP (RFAC)

TP (VC)

oscilloscope

VOLT/DIV: 200 mV
TIME/DIV: 500 ns 

level: 1.35 

±

 0.4 Vp-p

19

Procedure:
1.

Set the test disc (PATD-012). Disc chucking operation is
complete, then press the 

[POWER]

 button to turn the power

off.

2.

Connect an oscilloscpe to test point TP (TE1) and TP (VC) on
the BD board.

3.

Connect between test point TP (ADJ) on the MAIN board and
GND by lead wire.

4.

Press the  

[POWER]

 button to turn the power on and enter the

ADJ mode, then playback the number two track automatically.

5.

Press the 

[TIME]

 button.  (The tracking servo and the sledding

servo are turned OFF)

6.

Check the level B of the oscilliscope waveform and the A (DC
voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%

Traverse Waveform

7.

Press the 

[TIME]

 button. (The tracking servo and sledding servo

are turned ON)
Confirm the C (DC voltage) is almost equal to the A (DC
voltage) is step 6.

Traverse Waveform

Checking Location: BD board

+
–

BD board

TP (TE1)

TP (VC)

oscilloscope

0V

B

level: 1.15 

±

 0.5 Vp-p

Center of 
the waveform

A (DC 

voltage)

0V

Tracking servo

Sled servo

ON

C (DC 
voltage)

Tracking servo

Sled servo

OFF

TP 

(RFDC)

TP

 (FE1)

TP

 (VC)

IC131

IC150

IC101

TP

 (TE1)

TP 

(RFAC)

20

MEMO