Sony DHC-EX880MD / DHC-MD717 / MDS-EX880 / MDS-MS717 Service Manual ▷ View online
– 13 –
10. FUNCTIONS OF OTHER BUTTONS
Table 3.
Note:
The erasing-protection tab in not detected during the test mode.
Recording will start regardless of the position of the erasing-pro-
tection tab when the
Recording will start regardless of the position of the erasing-pro-
tection tab when the
[REC1]
button is pressed.
11. TEST MODE DISPLAYS
Each time the
[DISPLAY]
button pressed, the display changes in
the following order.
Note:
Auto gain display and IVR display are not used in servicing.
Button
Contents
fl
Sets continuous playback when pressed in the
STOP state.(servo all on)
When pressed during continuous playback, the
tracking and sled servo turns on/off.
STOP state.(servo all on)
When pressed during continuous playback, the
tracking and sled servo turns on/off.
p
Stop continuous playback and continuous re-
cording. (servo all off)
cording. (servo all off)
)
The sled moves to the outer circumference only
when this is pressed.
when this is pressed.
0
The sled moves to the inner circumference only
when this is pressed.
when this is pressed.
REC1
Turns recording on/off when pressed during
continuous playback.
continuous playback.
SHUFFLE
Switches between the pit and groove modes
when pressed.
when pressed.
CONTINUE
Switches between the CLV-S (pull-in mode) and
CLV-A (playing servo) modes when preseed.
(Switches the spindle servo mode.)
CLV-A (playing servo) modes when preseed.
(Switches the spindle servo mode.)
DISPLAY
Switches the display when pressed.
Returns to previous step. Stop operations.
Returns to previous step. Stop operations.
REPEAT
Releasing the test mode
§
Disc eject
Mode
display
Error rate
display
Address display
ADIP address
display
SUB Q address
display
Auto gain
display
IVR
display
Change over the display with the
SHUFFLE button.
SHUFFLE button.
1. MODE display
Displays “TEMP ADJUST”, “CPLAY MODE”, etc..
2. Error rate display
Error rates are displayed as follows.
C =
C =
AD =
C =
: Indicates C1 error
AD = : Indicates ADER
3. Address display
Address are displayed as follows.
h =
h =
a =
(MO groove)
With this display, if
[SHUFFLE]
button is pressed, the fol-
lowing will be displayed.
h =
h =
s =
(MO pit and CD)
h = : Header address
a = : ADIP address
s = : SUB Q address
a = : ADIP address
s = : SUB Q address
Note:
“—” is displayed when the address cannot be read.
4. Auto gain display
Auto gain are displayed as follows.
AG =
AG =
/
[
]
A B C
A = Focus servo gain coefficient
B = Tracking servo gain coefficient
C = [OK] or [NG] or [ - -] (not converged)
B = Tracking servo gain coefficient
C = [OK] or [NG] or [ - -] (not converged)
12. MEANINGS OF OTHER DISPLAYS
Table 4.
Display
Contents
Light
Off
Blinking
CONTINUE
During continuous
Stop state
LED
playback
(servo all off)
—
(servo all on)
PROGRAM Recording
Recording
—
LED
mode on
mode off
DIGITAL
CLV lock state
CLV unlock state
—
IN LED
ANALOG
Pit mode
Groove mode
—
IN LED
MONO
High reflection
Low reflection
—
LED
rate disc
rate disc
REC IT
Spindle servo
Spindle servo
LED
CLV-S
CLV-A
—
(pull-in mode)
(playing mode)
CD SYNC
ABCD adjustment
Not adjustment
—
LED
completed
Focus auto gain
Focus auto
ALL1
successful
—
gain
successful.
successful.
Tracking auto gain
Tracking
DISCS
successful
—
auto
gain failed.
gain failed.
– 14 –
SECTION 5
ELECTRICAL ADJUSTMENTS
1.
PRECAUTIONS FOR CHECKING LASER DI-
ODE EMISSION
ODE EMISSION
To check the emission of the laser diode during adjustments, never
view directly from the top as this may lose your eyesight.
view directly from the top as this may lose your eyesight.
2.
PRECAUTIONS FOR USE OF OPTICAL
PICK-UP (KMS-260A)
PICK-UP (KMS-260A)
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
tale 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 con-
necting the connector, be careful not to remove the solder. Also
tale adequate measures to prevent damage by static electricity.
Handle the flexible board with care as it breaks easily.
Optical pick-up flexible board
3.
PRECAUTIONS FOR ADJUSTMENTS
1) When replacing the following parts, perform the adjustments
and checks with
® in the order shown in the following table.
Table 1.
2) Set the test mode when performing adjustments.
After completing the adjustments, exit the test mode.
3) Perform the adjustments in the order shown.
4) Use the following tools and measuring devices.
4) Use the following tools and measuring devices.
• Test disc (CD for playback only) TDYS-1
(Parts No. 4-963-646-01)
• Laser power meter LPM-8001
(Parts No. J-2501-046-A)
• Oscilloscope (Measure after preforming CAL of prove.)
• Digital voltmeter
• Thermometer
• Digital voltmeter
• Thermometer
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)
4.
CREATING MO CONTINUOUSLY RECORDED
DISC
DISC
* This disc is used in focus bias adjustment and error rate check.
The following describes how to create a MO continuous record-
ing disc.
ing disc.
1. Insert a MO disc (blank disc) commercially available to slot 1.
2. Turn the
2. Turn the
[
=
SELECTOR
+
]
dial and display “CREC
MODE”.
3. Press the
[ENTER/YES]
button and display “CREC MID”.
“CREC (0300)” is displayed for a moment and recording starts.
4. Complete recording within 5 minutes.
5. Press the
5. Press the
[MENU/NO]
button and stop recording.
6. Press the
§ button and remove the MO disc.
(To exit from the TEST mode, press the
[REPEAT]
button.)
The above has been how to create a continuous recording 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.
Pick-up
Laser tap
Flexible board
Optical
BD board
Pick-up
IC171
D101
IC101, IC121, IC192
1. Temperature
compensation
×
®
®
®
offset adjustment
2. Laser power
®
®
×
®
adjustment
3. Traverse
®
®
×
®
adjustment
4. Focus bias
®
®
×
®
adjustment
5. Error rate check
®
®
×
®
– 15 –
5.
TEMPERATURE COMPENSATION OFFSET
ADJUSTMENT
ADJUSTMENT
Save the temperature data at that time in the non-volatile memory
as 25°C reference data.
as 25°C reference data.
Notes:
1.
Usually, do not perform this adjustment.
2.
Perform this adjustment in an ambient temperature of 22 °C to 28 °C.
Perform it immediately after the power is turned on when the internal
temperature of the unit is the same as the ambient temperature of 22
°C to 28 °C.
Perform it immediately after the power is turned on when the internal
temperature of the unit is the same as the ambient temperature of 22
°C to 28 °C.
3.
When D101 has been replaced, perform this adjustment after the tem-
perature of this part has become the ambient temperature.
perature of this part has become the ambient temperature.
Adjusting Method:
1. Turn the
1. Turn the
[
=
SELECTOR
+
]
dial and display “TEMP
ADJUST”.
2. Press the
[ENTER/YES]
button and select the “TEMP AD-
JUST” mode.
3. “TEMP =
” and the current temperature a data will be dis-
played.
4. To save the data, press the
[ENTER/YES]
button.
When not saving the data, press the
[MENU/NO]
button.
5. When the
[ENTER/YES]
button is pressed, “TEMP =
SAVE” will be displayed for some time, followed by “TEMP
ADJUST”.
When the
ADJUST”.
When the
[MENU/NO]
button is pressed, “TEMP ADJUST”
will be displayed immediately.
Specifications:
The temperature should be within “E0-EF”, “F0-FF”, “00-0F”,
“10-1F” and “20-2F”.
The temperature should be within “E0-EF”, “F0-FF”, “00-0F”,
“10-1F” and “20-2F”.
6.
LASER POWER ADJUSTMENT
Preparation:
Referring to “3. Disassembly”, remove the Base Unit from MD
Mechanism Deck.
Referring to “3. Disassembly”, remove the Base Unit from MD
Mechanism Deck.
Connection:
Adjusting Method:
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
) button
or
0 button and move the optical pick-up.)
Connect the digital voltmeter to TP29 (IOP+) and TP30
(IOP–) of the BD board.
(IOP–) of the BD board.
2. Turn the
[
=
SELECTOR
+
]
dial and display “LDPWR
ADJUST”.
(Laser power: for adjustment)
(Laser power: for adjustment)
3. Press the
[ENTER/YES]
button and display “LD 0.9 mW $
”.
4. Turn the
[
=
SELECTOR
+
]
dial so that the reading
of the laser power meter becomes 0.82 to 0.93 mW.
Set the range control on the laser power meter to 10 mW, then
press the
Set the range control on the laser power meter to 10 mW, then
press the
[ENTER/YES]
button to save the adjustment result
in the non- volatile memory.
(“LD SAVE $
(“LD SAVE $
” will be displayed for a moment.)
5. Then “LD 7.0 mW $
”will be displayed.
6. Turn the
[
=
SELECTOR
+
]
dial so that the reading
of the laser power meter becomes 6.9 to 7.1 mW, press the
[ENTER/YES]
button and save the adjustment result in the
nonvolatile memory.
(“LD SAVE $
(“LD SAVE $
” will be displayed for a moment.)
Note:
Do not perform the emission with 7.0 mW more than 15 seconds
continuously.
7. Turn the
[
=
SELECTOR
+
]
dial and display “LDPWR
CHECK”.
8. Press the
[ENTER/YES]
button and display “LD 0.9 mW $
”. Check that the reading of the laser power meter becomes
0.80 to 0.96 mW.
9. Press the
[ENTER/YES]
button and display “LD 7.0 mW $
”. Check that the reading of the laser power meter and digi-
tal voltmeter satisfy the specified value.
Specification:
Laser power meter reading : 7.0 ± 0.2 mW
Digital voltmeter reading : Optical pick-up displayed value
Laser power meter reading : 7.0 ± 0.2 mW
Digital voltmeter reading : Optical pick-up displayed value
±10%
10. Press the
[MENU/NO]
button and display “LDPWR CHECK”,
and stop the laser emission.
(The
(The
[MENU/NO]
button is effective at all times to stop the
laser emission.)
Optical pick-up
objective lens
laser
power meter
power meter
+
–
–
BD board
digital voltmeter
TP29 (IOP +)
TP30 (IOP –)
TP30 (IOP –)
KMS260A
27X40
B0567
B0567
lOP=56.7 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/1 (
lOP (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
(Optical pick-up label)
– 16 –
7.
TRAVERSE (E-F BALANCE) ADJUSTMENT
Note 1:
Data will be erased during MO reading if a recorded disc is
used in this adjustment.
used in this adjustment.
Note 2:
If the traverse waveform is not clear, connect the oscilloscope
as shown in the following figure so that it can be seen more
clearly.
as shown in the following figure so that it can be seen more
clearly.
Connection:
Adjusting Method:
1. Connect an oscilloscope to TP69 (TEO) and TP58 (VC) of the
1. Connect an oscilloscope to TP69 (TEO) and TP58 (VC) of the
BD board.
2. Load a MO disc (any available on the market) to slot 1. (Refer
to note 1.)
3. Press the
) button and move the optical pick-up outside
the pit.
4. Turn the
[
=
SELECTOR
+
]
dial and display “EFMO
ADJUST”.
5. Press the
[ENTER/YES]
button and display “EFB =
MO-
R”.
(Laser power READ power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)
(Laser power READ power/Focus servo ON/tracking servo
OFF/spindle (S) servo ON)
6. Turn the
[
=
SELECTOR
+
]
dial so that the waveforms
of the oscilloscope becomes the specified value. (When the
[
=
SELECTOR
+
]
dial is turned , the “
” of “EFB
=
MO-R” changes and the waveform changes.)
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(MO read power traverse adjustment)
Adjust the waveform so that the specified value is satisfied as
much as possible.
(MO read power traverse adjustment)
(Traverse Waveform)
7. Press the
[ENTER/YES]
button, and save the result of adjust-
ment to the non-volatile memory.
(“EFB =
(“EFB =
SAVE” will be displayed for a moment. Then
“EFB =
MO-W” will be displayed.)
8. Turn the
[
=
SELECTOR
+
]
dial so that the waveforms
of the oscilloscope becomes the specified value. (When the
[
=
SELECTOR
+
]
dial is turned, the “
” of “EFB
=
MO-W” changes and the waveform changes.)
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(MO write power traverse adjustment)
Adjust the waveform so that the specified value is satisfied as
much as possible.
(MO write power traverse adjustment)
(Traverse Waveform)
9. Press the
[ENTER/YES]
button, and save the result of adjust-
ment to the non-volatile memory.
(“EFB =
(“EFB =
SAVE” will be displayed for a moment. Then
“EFB =
MO-P” will be displayed.)
10. The optical pick-up moves to the pit area automatically and
servo is imposed.
11. Turn the
[
=
SELECTOR
+
]
dial until the waveforms
of the oscilloscope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
12. Press the
[ENTER/YES]
button, and save the result of adjust-
ment to the non-volatile memory.
(“EFB =
(“EFB =
SAVE” will be displayed for a moment. Then
“EF MO ADJUST” will be displayed.)
The disc stops rotating automatically.
The disc stops rotating automatically.
13. Press the
[REPEAT]
button and remove the MO disc.
14. Set the test mode again and load the test disc TDYS-1 to slot
1.
15. Turn the
[
=
SELECTOR
+
]
dial and display “EF CD
ADJUST”
16. Press the
[ENTER/YES]
button and display “EFB =
CD”.
Servo is imposed automatically.
17. Turn the
[
=
SELECTOR
+
]
dial until the waveforms
of the oscilloscope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
18. Press the
[ENTER/YES]
button, and save the result of ad-
justment to the non-volatile memory.
(“EFB =
(“EFB =
SAVE” will be displayed for a moment. Then
“EF CD ADJUST” will be displayed.)
19. Press the
§ button and remove the test disc TDYS-1.
+
–
–
oscilloscope
(DC range)
10 pF
330 k
Ω
TP69 (TEO)
TP58 (VC)
BD board
+
–
–
BD board
TP69 (TEO)
TP58 (VC)
oscilloscope
(DC range)
V: 0.1 V/div
H: 10 ms/div
H: 10 ms/div
A
B
VC
specification: A=B
A
B
VC
specification: A=B
A
B
VC
specification: A=B
A
B
VC
specification: A=B
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