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21

5-7-4. Auto Check
(See page 24)

Start

YES

NO

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

Replace IC195

Replace OP or IC195

Replace IC101, IC195, or D101

5-12. Iop NV SAVE (See page 27)

Replace OP, IC190, or IC195

Replace OP, IC102, IC190, 

or IC195

Replace OP, IC101, IC151, 

or IC195

Replace OP

Replace the spindle motor

End adjustments

After turning off and then on the power, 
initialize the EEPROM
For details, refer to “WHEN MEMORY NG IS DIS- 
PLAYED” in 1. SERVICING NOTES (See page 7)

• Abbreviation

OP: optical pick-up

5-8. INITIAL SETTING OF ADJUSTMENT VALUE 

(See page 26)

5-10. TEMPERATURE COMPENSATION OFFSET 

ADJUSTMENT (See page 26)

5-11. LASER POWER ADJUSTMENT 

(See page 26)

5-13. TRAVERSE ADJUSTMENT (See page 29)
5-14. FOCUS BIAS ADJUSTMENT (See page 30)
5-17. AUTO GAIN CONTROL OUTPUT LEVEL

ADJUSTMENT (See page 29)

“op change” in SELF-DIAGNOSIS FUNCTION
(ITEMS OF ERROR HISTORY MODE ITEMS 
AND CONTENTS) (See page 3)
5-9. RECORDING AND DISPLAYING THE IOP 

INFORMATION  (See page 26)

“spdl change” in SELF-DIAGNOSIS FUNCTION
(ITEMS OF ERROR HISTORY MODE ITEMS
AND CONTENTS) (See page 3)

22

To check the emission of the laser diode during adjustments, never
view directly from the top as this may lose your eye-sight.

As the laser diode in the optical pick-up is easily damaged by static
electricity, solder the laser tap of the flexible board when using it.
Before disconnecting the connector, desolder first. Before con-
necting the connector, be careful not to remove the solder. Also
take adequate measures to prevent damage by static electricity.
Handle the flexible board with care as it breaks easily.

Two types of optical pick-up, KMS-260B and KMS-260E, are used
for this set at manufacturing , and each type has its own specified
values for laser power check or laser power adjustment. Terefore,
make sure to check which type of optical pick-up is used for the
set before laser power check or laser power adjustment.
To find the type of optical pick-up is described as follows.

optical pick-up

flexible board

laser tap

1. When replacing the following parts, perform the adjustments

and checks with 

 in the order shown in the following table.

2. Set the test mode when performing adjustments.

After completing the adjustments, release the test mode.
Perform the adjustments and checks in “Group Service” of the
test mode.

3. Perform the adjustments to be needed in the order shown.
4. Use the following tools and measuring devices.

• Check Disc (TDYS-1) (Part No. : 4-963-646-01)
• Test Disk (MDW-74/GA-1) (Part No. : 4-229-747-01)
• Laser power meter LPM-8001 (Part No. : J-2501-046-A)

or
MD Laser power meter 8010S (Part No. :  J-2501-145-A)*

1

• Oscilloscope (Measure after performing CAL of prove.)
• Digital voltmeter
• Thermometer
• Jig for checking BD board waveform

(Part No. : J-2501-196-A)

5-8.

Initial setting of adjustment value

5-9.

Recording and displaying of Iop

information

5-10. Temperature compensation

offset adjustment

5-11. Laser power adjustment

5-12. Iop NV Save

5-13. Traverse adjustment

5-14. Focus bias adjustment

5-17. Auto gain adjustment

5-7-4. Auto Check

Optical

Pick-up

IC101

IC102

IC151

IC190

IC195

D101

Parts to be replaced

Adjustment

FPD
Plate (L)

FPD
Plate (S)

KMS-260B

KMS-260E

5. When observing several signals on the oscilloscope, etc.,

make sure that VC and ground do not connect inside the oscil-
loscope.
(VC and ground will become short-circuited)

6. Using the above jig enables the waveform to be checked with-

out the need to solder.
(Refer to Servicing Notes on page 6)

7. As the disc used will affect the adjustment results, make sure

that no dusts nor fingerprints are attached to it.

*

1

When performing laser power checks and adjustment (electrical
adjustment), use of the new MD laser power meter 8010S (Part
No. J-2501-145-A) instead of the conventional laser power me-
ter is convenient.
It sharply reduces the time and trouble to set the laser power
meter sensor onto the objective lens of optical pick-up.

23

•

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. Turn the 

[       AMS       ]

 knob to display “CREC 1MODE”

(C35).

3. Press the 

[YES]

 button to display “CREC 1MID”.

Display “CREC 1(0300)” and start to recording.

4. Complete recording within 5 minutes.
5. Press the 

[MENU/NO]

 button and stop recording .

6. Press the

Z

button and remove the disc.

The above has been how to create a continuous recorded disc for
the focus bias adjustment and error rate check.

 Be careful not to apply vibration during continuous recording.

These checks are performed before replacing parts according to
“approximate specifications” to determine the faulty locations. For
details, refer to “5-1. Parts Replacement and Adjustments” (see
page 20).

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

Procedure:
1. Turn the 

[       AMS       ]

 knob to display “TEMP CHECK”

(C12).

2. Press the 

[YES]

 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.)

Check the type and IOP value of the optical pick-up before checks.
(Refer to 5-4. How to Distinguish between Optical pick-up KMS-
260B and KMS-260E (see page 22), 5-9. Recording and Display-
ing the IOP Information (see page 26))

Procedure:
1. Set the laser power meter on the objective lens of the opti-

cal pic k-up. (When it cannot be set properl y,  press
the

m

button or

M

button to move the optical pick-up.)

Connect the digital voltmeter to CN105 pin 1 (I+3V) and CN105
pin 2 (IOP).

2. Then, turn the 

[       AMS       ]

 knob to display “LDPWR

CHECK” (C13).

3. Press the 

[YES]

 button once to display “LD 0.9mW$

”. Check

that the reading of the laser power meter become 0.85 to 0.91
mW (KMS-260B) or 0.90 to 0.96 mW (KMS-260E).

4. Press the 

[YES]

 button once more to display “ LD 7.0mW$

”.

Check that the reading the laser power meter and digital voltmeter
satisfy the specified value.

Specified Value:
Laser power meter reading : 7.0 

±

 0.2 mW (KMS-260B)

7.25 

±

 0.25 mW (KMS-260E)

Digital voltmeter reading : Optical pick-up displayed value 

±

 10%

5. Press the 

[MENU/NO]

 button to display “LDPWR CHECK”

(C13) and stop the laser emission.
(The 

[MENU/NO]

 button is effective at all times to stop the laser

emission.)

After step 4, each time the

  [YES] 

button is pressed, the display

will be switched between “LD 0.7W$

”, “LD 6.2mW$

”, and

“LD WP

$ 

”. Nothing needs to be performed here.

Checking Location: BD board (see page 30)

The current Iop value at laser power 7.0 mW 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.

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

Procedure:
1. Turn the 

[       AMS       ]

 knob to display “Iop Compare” (C27).

2. Press the 

[YES]

 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]

 button to end.

Optical pick-up
objective lens

laser
power meter

+
–

BD board

digital voltmeter

CN105 pin 

1

 (I+3V)

CN105 pin 

2

 (IOP)

KMS260B or E

20101

B0825

lOP=82.5 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/1 (

Ω

)

(Optical pick-up label)

For details of the method for
checking this value, refer to 
“5-9. Recording and Displaying
the IOP Information”

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24

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.

Procedure:
1. Turn the 

[       AMS       ]

 knob to display “AUTO CHECK”

(C01).

2. Press the 

[YES]

 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, and
then repeat from enter the test mode.

3. 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.

4. If a disc is loaded at step 3, the check will start automatically.
5. When  “XX CHECK” is displayed, the item corresponding to

XX will be performed.
When “06 CHECK” completes, the disc loaded at step 3 will be
ejected.  “DISC IN” will be displayed. Load the check disc
(TDYS-1).

6. When the disc is loaded in the step 5, the check will automatically

be resumed from “07 CHECK”.

7. After completing to test item 12, check OK or NG will be

displayed. If all items are OK, “CHECK ALL OK” will be
displayed. If any item is NG, it will be displayed as “NG: xxxx”.

When “CHECK 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.

All the following checks are performed by the Auto Check mode.
They therefore need not be performed in normal operation.
5-7-6. Traverse Check
5-7-7. Focus Bias Check
5-7-8. C PLAY Check
5-7-9. Self-Recording/Playback Check

Procedure:
1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105

pin 6 (VC) on the BD board.

2. Load a disc (any available on the market). (Refer to Note 1)
3. Press the

M

button to move the optical pick-up outside the

pit.

4. Turn the 

[       AMS       ]

 knob to display “EF MO CHECK”

(C14).

5. Press the 

[YES]

 button to display “EFB = 

 MO-R”.

(Laser power READ power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)

6. Observe the waveform of the oscilloscope, and check that the

specified value is satisfied. Do not turn the 

[       AMS       ]

knob.
(Read power traverse checking)

Traverse Waveform

7. Press the 

[YES]

 button to display “EFB = 

 MO-W”.

8. Observe the waveform of the oscilloscope, and check that the

specified value is satisfied. Do not turn the 

[       AMS       ]

knob.
(Write power traverse checking)

Traverse Waveform

Data will be erased during MO reading if a recorded disc is
used in this adjustment.

If the traverse waveform is not clear, connect the oscilloscope
as shown in the following figure so that it can be seen more
clearly.

+
–

oscilloscope

(DC range)

10 pF

330 k 

Ω

CN105 pin 

4

 (TE)

CN105 pin 

6

 (VC)

BD board

A

B

VC

Specified value : Below 10% offset value

Offset value (%) =                  X 100  

I

A – B

I

2 (A + B)

A

B

VC

Specified value : Below 10% offset value

Offset value (%) =                  X 100  

I

A – B

I

2 (A + B)

+
–

oscilloscope

(DC range)

V: 0.1 V/div
H: 10 ms/div

BD board

CN105 pin 

4

 (TE)

CN105 pin 

6

 (VC)

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