Sony MDS-JE470 (serv.man2) Service Manual ▷ View online
26
MDS-JE470
5-6-4. Auto Check
(See page 29)
(See page 29)
Start
YES
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
Replace IC195
Replace OP or IO195
Replace IC101, IC195, or D101
5-11. Iop NV SAVE (See page 32)
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 4-11. WHEN MEMORY NG IS
DISPLAYED (See page 24)
initialize the EEPROM
For details, refer to 4-11. WHEN MEMORY NG IS
DISPLAYED (See page 24)
• Abbreviation
OP: Optical pick-up
5-7. INITIAL SETTING OF ADJUSTMENT VALUE
(See page 31)
5-9. TEMPERATURE COMPENSATION OFFSET
ADJUSTMENT (See page 31)
5-10. LASER POWER ADJUSTMENT (See page 31)
5-12. TRAVERSE ADJUSTMENT (See page 32)
5-13. FOCUS BIAS ADJUSTMENT (See page 33)
5-16. AUTO GAIN CONTROL OUTPUT LEVEL
5-13. FOCUS BIAS ADJUSTMENT (See page 33)
5-16. AUTO GAIN CONTROL OUTPUT LEVEL
ADJUSTMENT (See page 34)
OP change in Err Display mode
Iop write
Iop write
Spdl change in Err Display mode
Adjustment flow
27
MDS-JE470
5-7. Initial setting of adjustment values
5-8. Recording of Iop information
5-9. TEMP ADJUST
5-10. Laser power adjustment
5-11. Iop NV Save
5-12. Traverse adjustment
5-13. Focus bias adjustment
5-16. Auto gain adjustment
5-6-4. AUTO CHECK
5-2. PRECAUTIONS FOR CHECKING LASER DIODE
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.
5-3. PRECAUTIONS FOR USE OF OPTICAL PICK-
UP (KMS-260B/260E)
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 connect-
ing 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 connect-
ing 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
5-4. 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 test mode when performing adjustments.
After completing the adjustments, exit the test mode.
Perform the adjustments and checks in “group S” of the test mode.
Perform the adjustments and checks in “group S” of the 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 (MD) TDYS-1
(Parts No. 4-963-646-01)
• Test Disk (MDW-74/GA-1) (Parts No. 4-229-747-01)
• Laser power meter LPM-8001 (Parts No. J-2501-046-A)
or
• Laser power meter LPM-8001 (Parts No. J-2501-046-A)
or
MD Laser power meter 8010S (Parts No. J-2501-145-A)
• 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
(Parts No. : J-2501-196-A)
Optical
Pick-up
IC101
IC102
IC151
IC190
IC195
D101
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 oscillo-
scope.
(VC and ground will become short-circuited.)
scope.
(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 Note on page 6.)
(Refer to Servicing Note on page 6.)
7) As the disc used will affect the adjustment results, make sure
that no dusts nor fingerprints are attached to it.
Parts to be replaced
Adjustment
28
MDS-JE470
5. Press the MENU/NO button and display “LDPWR CHECK”
and stop the laser emission.
(The MENU/NO button is effective at all times to stop the laser
emission.)
(The MENU/NO button is effective at all times to stop the laser
emission.)
Note 1: After step 4, each time the YES button is pressed, the
display will be switched between “LD 0.7 mW $
”,
“LD 6.2 mW $
”, and “LD Wp $
”. Nothing
needs to be performed here.
5-5. 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. Rotate the l AMS L knob and display “CREC1 MODE”.
3. Press the YES button again to display “CREC1 MID”.
2. Rotate the l AMS L knob and display “CREC1 MODE”.
3. Press the YES button again to display “CREC1 MID”.
Display “CREC (0300)” and start to recording.
4. Complete recording within 5 minutes.
5. Press the MENU/NO button and stop recording .
6. Press the AEJECT button and remove the disc.
5. Press the MENU/NO button and stop recording .
6. Press the AEJECT 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.
Note :
• Be careful not to apply vibration during continuous recording.
the focus bias adjustment and error rate check.
Note :
• Be careful not to apply vibration during continuous recording.
5-6. 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 Adjust-
ments” (See page 9).
“approximate specifications” to determine the faulty locations. For
details, refer to “Checks Prior to Parts Replacement and Adjust-
ments” (See page 9).
5-6-1. Temperature Compensation Offset Check
When performing adjustments, set the internal temperature and room
temperature to 22 to 28ºC.
Checks cannot be performed properly if performed after some time
from power ON due to the rise in the temperature of the IC and
diode, etc. So, perform the checks again after waiting some time.
temperature to 22 to 28ºC.
Checks cannot be performed properly if performed after some time
from power ON due to the rise in the temperature of the IC and
diode, etc. So, perform the checks again after waiting some time.
Checking Procedure:
1. Rotate the l AMS L knob to display “TEMP CHECK”.
1. Rotate the l AMS L knob to display “TEMP CHECK”.
(C12)
2. Press the YES 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.)
5-6-2. Laser Power Check
Before checking, check the Iop value of the optical pick-up.
(Refer to 5-8. Recording and Displaying Iop Information.)
(Refer to 5-8. Recording and Displaying Iop Information.)
Connection :
KMS
260B
20101
H0576
H0576
Iop = 57.6 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (
Iop (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
Checking 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, rotate the l AMS L knob and display “LDPWR
CHECK”.
3. Press the YES button once and display “LD 0.9 mW $
”.
Check that the reading of the laser power meter become the
specified value.
specified value.
4. Press the YES button once more and display “ LD 7.0 mW $
”. Check that the reading the laser power meter and digital
volt meter satisfy the specified value.
Specified Value :
Laser power meter reading : LD 0.9mW : 0.85-0.91mW (260B)
0.90-0.96mW (260E)
LD 7.0mW : 6.80-7.20mW (260B)
7.00-7.50mW (260E)
Digital voltmeter reading : Optical pick-up displayed value
± 10%
(Optical pick-up label)
(For details of the method for checking
this value, refer to “5-8. Recording and
Displaying Iop Information”.)
this value, refer to “5-8. Recording and
Displaying Iop Information”.)
Laser power
meter
meter
Optical pick-up
objective lens
objective lens
Digital volt meter
BD board
CN105 pin
1
(I+3V)
CN105 pin
2
(IOP)
R
5-6-3. Iop Compare
The current Iop value at laser power 7 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.
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
temperature.
Procedure
1. Rotate the l AMS L knob to display “Iop Compare”.
2. Press the YES button and start measurements.
3. When measurements complete, the display changes to
1. Rotate the l AMS L knob to display “Iop Compare”.
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.
displayed at yy to indicate whether the percentage of increase/
decrease is within the allowable range.
4. Press the MENU/NO button to end.
29
MDS-JE470
7. Press the YES button and display “EFB =
VC
A
B
Specification A = B
MO-W”.
8. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not rotate the l AMS L
knob.
(Write power traverse checking)
knob.
(Write power traverse checking)
(Traverse Waveform)
11. Press the YES button display “EF MO CHECK”
The disc stops rotating automatically.
12. Press the A EJECT button and remove the disc.
13. Load the check disc (MD) TDYS-1.
14. Roteto the l AMS L knob and display “EF CD CHECK”
13. Load the check disc (MD) TDYS-1.
14. Roteto the l AMS L knob and display “EF CD CHECK”
(C04).
15. Press the YES button and display “EFB =
CD”. Servo is
imposed automatically.
9. Press the YES button display “EFB =
MO-P”.
Then, the optical pick-up moves to the pit area automatically
and servo is imposed.
and servo is imposed.
10. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not rotate the l AMS L
knob.
knob.
(Traverse Waveform)
Checking Procedure:
1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105 pin
1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105 pin
6
(VC) of the BD board.
2. Load a test disc (MDW-74/GA-1). (Refer to Note 1.)
3. Press the M button and move the optical pick-up outside the
3. Press the M button and move the optical pick-up outside the
pit.
4. Rotate the l AMS L knob and display “EF MO CHECK”.
5. Press the YES button and display “EFB =
5. Press the YES button and display “EFB =
MO-R”.
(Laser power READ power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)
spindle (S) servo ON)
V : 0.5 V/div
H : 10 ms/div
Input : DC mode
H : 10 ms/div
Input : DC mode
Oscilloscope
BD board
CN105 pin
4
(TE)
CN105 pin
6
(VC)
VC
A
B
Specified value : Below 10% offset value
Offset value (%) = X 100
IA – BI
2 (A + B)
VC
A
B
Specified value : Below 10% offset value
Offset value (%) = X 100
IA – BI
2 (A + B)
5-6-4. Auto Check
This test mode performs C-REC and C-PLAY 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.
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. Press the YES button. If “LDPWR minicheck” is displayed, it
1. Press the YES button. If “LDPWR minicheck” 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 step 1.
this case, perform the laser power check and Iop compare, and
then repeat from step 1.
2. 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.
74/GA-1) which can be recorded.
3. If a disk is loaded at step 2, the check will start automatically.
4. When “XX CHECK” is displayed, the item corresponding to
4. When “XX CHECK” is displayed, the item corresponding to
XX will be performed.
When “06 CHECK” completes, the disc loaded at step 2 will be
ejected. “DISC IN” will be displayed. Load the check disc (MD)
TDYS-1.
When “06 CHECK” completes, the disc loaded at step 2 will be
ejected. “DISC IN” will be displayed. Load the check disc (MD)
TDYS-1.
5. When the disc is loaded, the check will automatically be resumed
from “07 CHECK”.
6. 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”.
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 the other spindle motor,
thread motor, etc.
When displayed as “NG:xxxx”, it means that the optical pick-up is
faulty. In this case, replace the optical pick-up.
pick-up is normal. Check the operations of the other spindle motor,
thread motor, etc.
When displayed as “NG:xxxx”, it means that the optical pick-up is
faulty. In this case, replace the optical pick-up.
5-6-5. Other Checks
All the following checks are performed by the Auto Check mode.
They therefore need not be performed in normal operation.
They therefore need not be performed in normal operation.
1. Load a continuously recorded test disc (MDW-74/GA-1).
(Refer to “5-5. Using the Continuously Recorded Disc”.)
5-6-6. Traverse Check
Connection :
VC
A
B
Specified value : Below 10% offset value
Offset value (%) = X 100
IA – BI
2 (A + B)
6. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not rotate the AMS knob.
(Read power traverse checking)
(Read power traverse checking)
(Traverse Waveform)
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