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HCD-M700

Checks Prior to Repairs

These checks are performed before replacing parts according to
“approximate specifications” to determine the faulty locations. For
details, refer to “Checks Prior to Parts Replacement and Adjustments
in MD” (see page 12).

6-1. Temperature Compensation Offset Check

When performing adjustments, set the internal temperature and room
temperature to 22 to 28ºC.

Procedure:

1. Press the MD

“R” or MD

“R” button to display

“TEMP CHECK” (C12).

2. Press the ENTER/YES “R” button.
3. “T=@@(##) [OK]” should be displayed. If “T=@@ (##) [NG]”

is displayed, it means that the results are bad.
(@@ indicates the current value set, and ## indicates the value
written in the non-volatile memory.)

6-2. Laser Power Check

Before checking, check the Iop value of the optical pick-up.
Refer to 8. Recording and Displaying the Iop Information (see page
39).

Connection:

Procedure:

1. Set the laser power meter on the objective lens of the optical

pick-up. (When it cannot be set properly, press the

button

button to move the optical pick-up.)

Connect the digital volt meter to CN105 pin

(I+3V) and

CN105 pin

(Iop).

2. Then, press the MD

“R” or MD

“R” button and

display “LDPWR CHECK” (C13).

3. Press the ENTER/YES “R” button once and display “L

0.93mW$

”. Check that the reading of the laser power meter

becomes specified value.

Note

: Never allow the laser emission at 7.25mW for 1.5 seconds or longer.

Specified Value:

4. Press the ENTER/YES “R”

button once more and display “ L

7.25mW$

”. Check that the reading the laser power meter

and digital volt meter satisfy the specified value.

Specified Value:

Laser power meter reading :

Digital voltmeter reading : Optical pick-up displayed value

10%

5. Press the

MENU/NO “R”

button and display “LDPWR

CHECK” (C13) and stop the laser emission.
(The MENU/NO “R” button is effective at all times to stop the
laser emission.)

Note:

After step 4, each time the

ENTER/YES “R”

button is pressed,

the display will be switched to “L 0.73mW$

”and “L

6.40mW$

” “L WP

”. Nothing needs to be

performed here.

Checking Location:

BD board (see page 43)

6-3. Iop Compare

The current Iop value at laser power 7.25mW output and reference
Iop value (set at shipment) written in the nonvolatile memory are
compared, and the rate of increase/decrease will be displayed in
percentage.

Note:

Perform this function with the optical pick-up set at room tempera-
ture.

Procedure:

1. Press the MD

“R” or MD

“R” button to display “Iop

Compare” (C27).

2. Press the ENTER/YES “R”

button and start measurements.

3. When measurements complete, the display changes to “

xx%

yy”.
xx is the percentage of increase/decrease, and OK or NG is
displayed at yy to indicate whether the percentage of increase/
decrease is within the allowable range.

4. Press the

MENU/NO “R”

button to end.

Using the Continuously Recorded Disc

* This disc is used in focus bias adjustment and error rate check.

The following describes how to create a continuous recording
disc.

1. Insert a disc (blank disc) commercially available.
2. Press the MD

“R” or MD

“R” button and display “CREC

1MODE” (C35).

3. Press the ENTER/YES “R”

button again to display “CREC 1