Sony HCD-M700 Service Manual ▷ View online
33
HCD-M700
Other faults are suspected.
Check the mechanism parts (spindle motor, sled motor, etc.).
Check the mechanism parts (spindle motor, sled motor, etc.).
Start
NG
NG
NG
OK
OK
OK
Laser Power Check
6-2.
(See page 36)
6-3.
(See page 36)
6-4.
(See page 37)
Iop Compare
Auto Check
Replace optical pick-up or MDM-7B4M
MD SECTION
Note 1:
About “R”
As this unit has only a few buttons, some operations require the use of remote commander (RM-SM700E/provided with unit) buttons. These
operations are indicated as “R” in this manual.
Example:
As this unit has only a few buttons, some operations require the use of remote commander (RM-SM700E/provided with unit) buttons. These
operations are indicated as “R” in this manual.
Example:
MENU/NO “R”
...Press the
[MENU/NO]
button of the remote commander.
Note 2:
Incorrect operations may be performed if the MD test mode is not entered properly.
In this case, press the
In this case, press the
?/1
button to turn the power off, and retry to enter the MD test mode.
1. Parts Replacement and Adjustment
If malfunctions caused by optical pick-up such as sound skipping are suspected, follow the following check.
Check before replacement
SECTION 5
ELECTRICAL ADJUSTMENTS
34
HCD-M700
Flow Chart for Adjustment
YES
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
Start
IC195 replacement
OP or IC195 replacement
IC101, IC195 or D101
replacement
OP, IC190 or IC195
replacement
After turning the power off and on, initialises the non-volatile
memory (EEPROM).
memory (EEPROM).
7. Initial setting of adjustment value (See page 39)
9. Temperature compensation offset adjustment (See page 39)
10. Laser power adjustment (See page 39)
OP, IC102, IC190 or IC195
replacement
OP, IC101, IC151 or IC195
replacement
OP replacement
Spindle motor replacement
6-4. Auto check (See page 37)
End
11. Iop NV save (See page 40)
12.Traverse adjustment (See page 40)
13. Focus bias adjustment (See page 41)
16. Auto gain control output level adjustment (See page 42)
13. Focus bias adjustment (See page 41)
16. Auto gain control output level adjustment (See page 42)
In Err display mode, write OP change iop
In Err display mode, Spdl change
•Abbreviation
OP: Optical pick-up
OP: Optical pick-up
35
HCD-M700
2.
Precautions for Checking Laser Diode
Emission
Emission
To check the emission of the laser diode during adjustments, never
view directly from the top as this may lose your eye-sight.
view directly from the top as this may lose your eye-sight.
3.
Precautions for Use of Optical Pick-Up
(KMS-260)
(KMS-260)
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 connecting
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.
electricity, solder the laser tap of the flexible board when using it.
Before disconnecting the connector, desolder first. Before connecting
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.
Optical pick-up flexible board
4. Precautions for Adjustments
1. When replacing the following parts, perform the adjustments
and checks with
in the order shown in the following table.
2. Set the MD test mode when performing adjustments.
After completing the adjustments, exit the MD test mode.
Perform the adjustments and checks in “Group Service” of the
MD test mode.
Perform the adjustments and checks in “Group Service” of the
MD test mode.
3. Perform the adjustments to be needed in the order shown.
4. Use the following tools and measuring devices.
•
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)*
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
• Digital voltmeter
• Thermometer
• Jig for checking BD board waveform
(Part No. : J-2501-196-A)
pick-up
flexible board
laser tap
5. When observing several signals on the oscilloscope, etc.,
make sure that VC and ground do not connect inside the
oscilloscope.
(VC and ground will become short-circuited.)
oscilloscope.
(VC and ground will become short-circuited.)
6. Using the above jig enables the waveform to be checked without
the need to solder.
(Refer to Servicing Notes on page 10.)
(Refer to Servicing Notes on page 10.)
7. As the disc used will affect the adjustment results, make sure
that no dusts nor fingerprints are attached to it.
*
1
Laser power meter
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
meter is convenient.
It sharply reduces the time and trouble to set the laser power
meter sensor onto the objective lens of optical pick-up.
adjustment), use of the new MD laser power meter 8010S (Part
No. J-2501-145-A) instead of the conventional laser power
meter is convenient.
It sharply reduces the time and trouble to set the laser power
meter sensor onto the objective lens of optical pick-up.
7.
Initial setting of adjustment value
8.
Recording of Iop information
9.
Temperature compensation
offset adjustment
10. Laser power adjustment
11. Iop NV Save
12. Traverse adjustment
13. Focus bias adjustment
16. Auto gain adjustment
6-4. AUTO CHECK
Optical
Pick-up
IC101
IC102
IC151
IC190
IC195
D101
Parts to be replaced
Adjustment
36
HCD-M700
6.
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).
“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.
temperature to 22 to 28ºC.
Procedure:
1. Press the MD
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]”
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.)
(@@ 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).
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
1. Set the laser power meter on the objective lens of the optical
pick-up. (When it cannot be set properly, press the m button
or M button to move the optical pick-up.)
Connect the digital volt meter to CN105 pin 1 (I+3V) and
CN105 pin 2 (Iop).
or M button to move the optical pick-up.)
Connect the digital volt meter to CN105 pin 1 (I+3V) and
CN105 pin 2 (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 :
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.)
(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.
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.
ture.
Procedure:
1. Press the MD
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.
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.
5.
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.
disc.
1. Insert a disc (blank disc) commercially available.
2. Press the MD
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
MID”.
Display “CREC 1(0300)” and start to recording.
Display “CREC 1(0300)” and start to recording.
4. Complete recording within 5 minutes.
5. Press the
5. Press the
MENU/NO “R”
button and stop recording .
6. Press the Z MD button and remove the disc.
The above has been how to create a continuous recorded data for
the focus bias adjustment and error rate check.
the focus bias adjustment and error rate check.
Note:
Be careful not to apply vibration during continuous recording.
Optical pick-up
objective lens
objective lens
laser
power meter
power meter
+
–
–
BD board
digital voltmeter
CN105 pin
1
(I+3V)
CN105 pin
2
(Iop)
KMS260E
20101
H0576
lop=57.6 mA in this case
lop (mA) = Digital voltmeter reading (mV)/1 (
lop (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
(Optical pick-up label)
For details of the method for
checking this value, refer to
“8. Recording and Displaying
the Iop Information”
checking this value, refer to
“8. Recording and Displaying
the Iop Information”
KMS-260B
0.85 to 0.91mW
KMS-260E
0.90 to 0.96mW
KMS-260B
6.80 to 7.20mW
KMS-260E
7.00 to 7.50mW
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