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13

The IOP value labeled on the optical pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need
to look at the value on the label of the optical pick-up. When replacing the optical pick-up or non-volatile memory (IC171 of BD (MD)
board), record the IOP value on the optical pick-up according to the following procedure.

Record Precedure:
1.

When the power ON, press the  ?/1  button while pressing the  s  button and  z (TAPE)  button together.

2.

Press the  lm/TUNING –   button or  ML/TUNING +  button to display “[Service]”, and press the  ENTER/YES “R”  button.

3.

Press the  lm/TUNING –  button or  ML/TUNING +  button to display “ lop  Write”, and press the  ENTER/YES “R”
button.

4.

The display becomes “Ref=@@@.@” (@ is an arbitrary number) and the numbers which can be changed will blink.

5.

Input the IOP value written on the optical pick-up.

To select the number : Press the  lm/TUNING –  button or  ML/TUNING +   button.
To select the digit

: Press the  SYNCHRO REC  button and  ENTER/START  button at the sawe time. 

Note 1

)

If a message “Can not SYNC!” or “NO TAPE” appears momentarily, press  SYNCRO REC  button several times until “CD-MD
SYNC?” appears momentarily.

6.

When the  ENTER/YES “R”  button is pressed, the display becomes “Measu=@@@.@” (@ is an arbitrary number).

7.

As the adjustment results are recorded for the 6 value. Leave it as it is and press the  ENTER/YES “R”  button.

8.

“Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop
Write”.

9.

Press the  REPEAT/DOLBY NR/STEREO/MONO  button to exit.

Display Precedure:
1.

When the power ON, press the  ?/1  button while pressing the  s  button and  z (TAPE)  button together.

2.

Press the  lm/TUNING –  button or  ML/TUNING +  button to display “[Service]”, and press the  ENTER/YES “R”  button.

3.

Press the  lm/TUNING –  button or  ML/TUNING +  button to display “lop Read”, and press the  ENTER/YES “R”  button.

@@.@ : indicates the Iop value labeled on the pick-up.
##.#

: indicates the Iop value after adjustment

5.

To end, press  MENU/NO “R”   button to display “Iop Read”. Then press the  REPEAT/DOLBY NR/STEREO/MONO  button to display
“Standby”.

14

• 0.9 mW power

Specified value : 0.84 to 0.92 mW

• 7.0 mW power

Specified value : 6.8 to 7.2 mW

lop (at 7mW)

• Labeled on the optical pickup

Iop value 

±

 10mA

• Traverse waveform

Specified value : Below 10% offset

• Error rate check

Specified value : For points a, b, and c

C1 error : 220 or less

AD error : 2 or less

• Error rate check

Specified value:

a. When using test disc (MDW-74/AU-1)

C1 error : Below 80

AD error : Below 2

b.When using check disc (TDYS-1)

C1 error : 50 or less

• C PLAY error rate check

Specified value:

C1 error : 80 or less

AD error : 2 or less

• Unsatisfactory if displayed as T=@@ (##) [NG]”

NG

(@@, ## are both arbitrary numbers)

Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent.
Details of the procedures are described in “5 Electrical Adjustments”.

Laser power check

(5-6-2 : See page 36)

Traverse check

(5-6-3 : See page 37)

Focus bias check

(5-6-4 : See page 38)

C PLAY check

(5-6-5 : See page 38)

Self-recording/playback
check

(REC/PLAY)

(5-6-6 : See page 38)

TEMP check

(Temperature

compensation

offset check)

(5-6-1 : See page 36)

• Clean the optical pick-up

• Adjust again

• Replace the optical pick-up

• Replace the optical pick-up

• Replace the optical pick-up

• Replace the optical pick-up

• Replace the optical pick-up

If always unsatisfactory:

• Replace the overwrite head

• Check for disconnection of the circuits around the

overwrite head

If occasionally unsatisfactory:

• Check if the overwrite head is distorted

• Check the mechanism around the sled

• Check for disconnection of the circuits around

D101 (BD board)

• Check the signals around IC101, IC121, CN102,

CN103 (BD board)

The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for
adjustments.
When performing adjustments, use the specified values for adjustments.

15

The system microprocessor can be reset in the following procedure.
Use these procedure when the unit cannot be operated normally due to hung-up of the microprocessor, etc.
Use of the RESET switch is recommended when the machine cannot exit the REtry CASE DISPLAY mode or a machine does not operate
correctly after re-assembling.
Procedure :
Press the S901 (  RESET  button of the back panel) on the MAIN board.

S901
RESET button

16

• In this test mode, the causes for retry of the unit during recording can be displayed on the fluorescent indicator tube. During playback, the

“track mode” for obtaining track information will be set.
This is useful for locating the faulty part of the unit.

• The following will be displayed :

During recording and stop : Retry cause, number of retries, and number of retry errors.
During playback

: Information such as type of disc played, part played, copyright.

These are displayed in hexadecimal.

Precedure:
1.

Load a recordable disc whose contents can be erased, into the unit.

2.

Press the  MENU/NO “R”  button. When “Edit/Menu” is displayed on the fluorescent indicator tube, press the  lm/TUNING –
button or  ML/TUNING +  button to display “All Erase?”.

3.

Press the  ENTER/YES “R”  button.

4.

“All Erase??” is displayed on the fluorescent indicator tube.

5.

Press the  ENTER/YES “R”  button to display “Complete!!”, and press the  s  button immediately. Wait for about 10 seconds while
pressing the button.

6.

When the “TOC” displayed on the fluorescent display tube goes off, release the  s  button.

7.

Press the  z MD  button to enter recording standby. Then press the  MD 7  button and start recording. In about 2 seconds, the record
mode retry cause is displayed. (Fig.1) If recording cannot be performed, press the  FUNCTION  button and set a different section.

8.

To check the “track mode”, stop recording by pressing  s  button and press the  MD 7  button to start play and the track information
in the play mode appears.

9.

To exit the test mode, press the  ?

/1  button, and turn OFF the power. When “STNDBY” disappears, disconnect the power plug from the

outlet. If the test mode cannot be exited, refer to “Forced Reset”on page 15.

8

4

2

1

8

4

2

1

b7 b6 b5 b4 b3 b2 b1 b0

0

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

0

When ADER was counted more than five times continuously

When ADER was counted more than five times continuously

When ADIP address is not continuous

When DIN unlock is detected

When not in focus

When ABCD signal level exceeds the specified range

When CLV is unlocked

When access operation is not performed normally

shock

ader5

Discontinuous address

DIN unlock

FCS incorrect

IVR rec error

CLV unlock

Access fault

01

02

04

08

10

20

40

80

Reading the Display:
Convert the hexadecimal display into binary display. If more than two causes, they will be added.

When 42 is displayed:

Higher bit

: 4 = 0100 

n b6

Lower bit

: 2 = 0010 

n b1

In this case, the retry cause is combined of “CLV unlock” and “ader5”.

When A2 is displayed:

Higher bit

: A = 1010 

n b7+b5

Lower bit

: 2 = 0010 

n b2

The retry cause in this case is combined of “access fault”, “IVR rec error”, and “ader5”.

}

 Address (Physical address on disc)

RTs@@c##c**

Fluorescent display tube display

@@ : Cause of retry
##

: Number of retries

**

: Number of retry errors

@@####**$$

Fluorescent display tube display

@@ : Parts No. (name of area named on TOC)
##

: Cluster

**

: Sector

$$

: Track mode (Track information such as copyright

information of each part)

Reading the Retry Cause Display