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5

CD-TEXT
This unit is provided with a simple CD-TEXT display function.
The CD-TEXT contents of 50 tracks are displayed on the fluorescent display tube.
Since the function is simple, some special characters may not be displayed, or may be displayed as other characters.

6

The special jig (J-2501-149-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be
performed are shown as follows.

GND : Ground
I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser)
IOP : For measuring IOP (Check the deterioration of the optical pick-up laser)
TEO : TRK error signal (Traverse adjustment)
VC

: Reference level for checking the signal

RF

: RF signal (Check jitter)

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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 board),
record the IOP value on the optical pick-up according to the following procedure.

Record Precedure:
1. With the power ON, press the  CD x  button while pressing the  MD REC z  and  MD x  buttons together.
2. Press the  .(R) ,  >(R)  button to display “Service”, and press the  ENTER/YES (R)  button.
3. Press the  .(R) ,  >(R)  button to display “Iop Write”, and press the  ENTER/YES (R)  button.
4. The display changes to “Ref=@@@.@” (@ is an arbitrary number) and the digits which can be changed, blink.
5. Input the IOP value labeled on the optical pick-up.

To select the value

:

Press the  .(R) ,  > (R)  button.

6. When the  ENTER/YES (R)  button is pressed, the display changes to “Measu=###.#” (# is an arbitrary number).
7. The adjustment value that is obtained by the adjustment described in separate section of Manual, can be saved in this set up. However,

leave the value 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 change to “Iop

Write”.

Display Precedure:
1. With the power ON, press the  CD x  button while pressing the  MD REC z  and  MD x  buttons together.
2. Press the  .(R) ,  >(R)  button to display “Service”, and press the  ENTER/YES (R)  button.
3. Press the  .(R) ,  >(R)  button to display “Iop Read”, and press the  ENTER/YES (R)  button.
4. “@@.@/##.#” is displayed and the recorded contents are displayed.

@@.@

:

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”.

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• 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 : Below 220

AD error : Below 2

• 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 : Below 50

• CPLAY error rate check

Specified value:

C1 error : Below 80

AD error : Below 2

• 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 “6 Electrical Adjustments”.

Laser power check

Traverse check

Focus bias check

C PLAY check

Self-recording/playback

check

(REC/PLAY)

TEMP check

(Temperature

compensation

offset check)

Criteria for Determination

(Unsatisfactory if specified value is not satisfied)

• 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)

Measure if unsatisfactory:

Note:
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.