Sony DHC-EX77MD / DHC-MD77 / MDS-EX77 / MDS-EX770 Service Manual ▷ View online
– 25 –
4-6.
OPERATING THE CONTINUOUS PLAYBACK
MODE
MODE
4-6-1.
Entering the Continuous Playback Mode
1. Set the disc in the unit. (Whichever recordable discs or discs
for playback only are available.)
2. Turning the SELECTOR knob and display “CPLAY MODE”.
3. Press the ENTER/YES button to change the display to
3. Press the ENTER/YES button to change the display to
“CPLAY MID”.
4. When access completes, the display changes to
“C1=
AD=
”.
Note: The numbers “
” displayed show you error rates and ADER.
4-6-2.
Changing the Parts to be Played-back
1. Press the ENTER/YES button during continuous playback to
change the display as below.
2. When access completes, the display changes to
“C1=
AD=
”.
Note: The numbers “
” displayed show you error rates and ADER.
4-6-3.
Ending the Continuous Playback Mode
1. Press the EDIT/NO button. The display will change to
“CPLAY MODE”.
2. Press the
§ EJECT button and remove the disc.
Notes:
1. The playback start address for IN, MID, and OUT are as fol-
1. The playback start address for IN, MID, and OUT are as fol-
lows.
IN
IN
: 40h cluster
MID : 300h cluster
OUT : 700h cluster
In case you want to display the address of the playback posi-
tion on the display, press the DISPLAY/CHARACTER but-
ton and display “CPLAY (
OUT : 700h cluster
In case you want to display the address of the playback posi-
tion on the display, press the DISPLAY/CHARACTER but-
ton and display “CPLAY (
)”.
2. The EDIT/NO button can be used to stop playing anytime.
4-7.
OPERATING THE CONTINUOUS RECORDING
MODE
MODE
4-7-1. Entering the Continuous Recording Mode
1. Set the MO disc in the unit. (Refer to note 3.)
2. Turning the SELECTOR knob and display “CREC MODE”.
3. Press the ENTER/YES button to change the display to “CREC
2. Turning the SELECTOR knob and display “CREC MODE”.
3. Press the ENTER/YES button to change the display to “CREC
MID”.
4. When access completes, the display changes to “CREC (
)”
and
REC
lights up.
Note: The numbers “ ” displayed shows you the recording posi-
tion address.
4-7-2.
Changing the Parts to be Recorded
1. When the ENTER/YES button is pressed during continuous
recording, the display changes as below. (
REC
indication
turns off during change-over of display.)
2. When access completes, the display changes to “CREC (
)”
and
REC
lights up.
Note: The numbers “ ” displayed shows you the recording posi-
tion address.
4-7-3.
Ending the Continuous Recording Mode
1. Press the EDIT/NO button. The display will change to “CREC
MODE” and
REC
goes off.
2. Press the
§ EJECT button and remove the disc.
Notes:
1. The recording start address for IN, MID, and OUT are as fol-
1. The recording start address for IN, MID, and OUT are as fol-
lows.
IN
IN
: 40h cluster
MID : 300h cluster
OUT : 700h cluster
OUT : 700h cluster
2. The EDIT/NO button can be used to stop recording anytime.
3. During the test mode, the erasing-protection tab will not be
3. During the test mode, the erasing-protection tab will not be
detected. Therefore be careful not to set the continuous re-
cording mode when a disc not to be erased is set in the unit.
cording mode when a disc not to be erased is set in the unit.
4. Do not perform continuous recording for long periods of time
above 5 minutes.
5. During continuous recording, be careful not to apply vibra-
tion.
CPLAY MID
CPLAY OUT
CPLAY IN
CREC MID
CREC OUT
CREC IN
– 26 –
Light
Off
(
During continuous
playback (servo all
on)
playback (servo all
on)
Stop state
(servo all off)
(servo all off)
Ñ
P
Tracking and sled
servo off
servo off
Tracking and
sled servo on
sled servo on
Ñ
REC
Recording mode on
Recording
mode off
mode off
Ñ
CLOCK
CLV lock state
CLV unlock
state
state
Ñ
TRACK
Pit mode
Groove mode
Ñ
DISC
High reflection rate
disc
disc
Low reflection
rate disc
rate disc
Ñ
DATE
Spindle servo
CLV-S
(pull-in mode)
CLV-S
(pull-in mode)
Spindle servo
CLV-A
(playing mode)
CLV-A
(playing mode)
Ñ
A.SPACE
ABCD adjustment
completed
completed
Not adjustment
Ñ
AÐB
Focus auto gain and
tracking auto gain
successful
tracking auto gain
successful
Ñ
Display
Blinking
Contents
Focus
auto
gain
suc-
cessful,
tracking
auto
gain
failed
auto
gain
suc-
cessful,
tracking
auto
gain
failed
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
SCROLL button.
SCROLL button.
4-8.
EEP MODE
This mode reads and writes the contents of the non-volatile
memory.
It is not used in servicing. If set accidentally, press the
EDIT/NO button immediately to exit it.
memory.
It is not used in servicing. If set accidentally, press the
EDIT/NO button immediately to exit it.
Note: Auto gain display and IVR display are not used in servicing.
Note: The erasing-protection tab in not detected during the test
mode. Recording will start regardless of the position of
the erasing-protection tab when the
the erasing-protection tab when the
r REC button is
pressed.
4-10.
TEST MODE DISPLAYS
Each time the DISPLAY/CHARACTER button pressed, the dis-
play changes in the following order.
play changes in the following order.
Table 4-3.
4-9.
FUNCTIONS OF OTHER BUTTONS
1. MODE display
Displays “TEMP ADJUST”, “CPLAY MODE”, etc..
2. Error rate display
Error rates are displayed as follows.
C1=
C1=
AD=
C1= : Indicates C1 error
AD= : Indicates ADER
AD= : Indicates ADER
3. Address display
Address are displayed as follows.
h=
h=
a=
(MO groove)
With this display, if SCROLL button is pressed, the follow-
ing will be displayed.
h=
ing will be displayed.
h=
s=
(MO pit and CD)
h=: Header address
s=: SUB Q address
a=: ADIP address
s=: SUB Q address
a=: ADIP address
Note: “—” is displayed when the address cannot be read.
4. Auto gain display
Auto gain are displayed as follows.
AG
AG
F=
T=
F= Focus auto gain collection value
T= Tracking auto gain collection value
T= Tracking auto gain collection value
4-11.
MEANINGS OF OTHER DISPLAYS
Table 4-4.
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
recording. (servo all off)
recording. (servo all off)
)
The sled moves to the outer circumference
only when this is pressed.
only when this is pressed.
0
The sled moves to the inner circumference
only when this is pressed.
only when this is pressed.
r REC
Turns recording on/off when pressed during
continuous playback.
continuous playback.
SCROLL
Switches between the pit and groove modes
when pressed.
when pressed.
PROGRAM
Switches between the CLV-S (pull-in mode)
and CLV-A (playing servo) modes when
pressed. (Switches the spindle servo mode.)
and CLV-A (playing servo) modes when
pressed. (Switches the spindle servo mode.)
DISPLAY/
CHARAC-
CHARAC-
TER
Switches the display when pressed.
Returns to previous step. Stop operations.
Returns to previous step. Stop operations.
§ EJECT
Disc eject
REC
– 27 –
SECTION 5
ELECTRICAL ADJUSTMENTS
5-3.
PRECAUTIONS FOR ADJUSTMENTS
1) When replacing the following parts, perform the adjustments
and checks with
® in the order shown in the following table.
Optical pick-up flexible board
5-1.
PRECAUTIONS FOR CHECKING LASER DI-
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.
5-2.
PRECAUTIONS FOR USE OF OPTICAL
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.
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.
Table 5-1.
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
®
®
×
®
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.
•
Check Disc (MD) TDYS-1
(Parts No. 4-963-646-01)
(Parts No. 4-963-646-01)
•
Laser power meter LPM-8001
(Parts No. J-2501-046-A)
(Parts No. J-2501-046-A)
•
Oscilloscope (Measure after preforming CAL of prove.)
•
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)
5-4.
CREATING MO CONTINUOUSLY RECORDED
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. Set the test mode.
2. Insert a MO disc (blank disc) commercially available.
3. Turning the SELECTOR knob and display “CREC MODE”.
4. Press the ENTER/YES button and display “CREC MID”.
2. Insert a MO disc (blank disc) commercially available.
3. Turning the SELECTOR knob and display “CREC MODE”.
4. Press the ENTER/YES button and display “CREC MID”.
“CREC (0300)” is displayed for a moment and recording starts.
5. Complete recording within 5 minutes.
6. Press the EDIT/NO button and stop recording.
6. Press the EDIT/NO button and stop recording.
7. Press the
§ EJECT button and remove the MO disc.
The above has been how to create a continuous recording data for
the focus bias adjustment and error rate check.
Note: Be careful not to apply vibration during continuous
the focus bias adjustment and error rate check.
Note: Be careful not to apply vibration during continuous
recording.
Pick-up
Laser tap
Flexible board
– 28 –
5-5.
TEMPERATURE COMPENSATION OFFSET
ADJUSTMENT
ADJUSTMENT
Save the temperature data at that time in the non-volatile memory
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
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.
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 temperature of this part has become the ambient tempera-
ture.
ture.
Adjusting Method:
1. Turning the SELECTOR knob and display “TEMP AD-
1. Turning the SELECTOR knob and display “TEMP AD-
JUST”.
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 EDIT/NO button.
5. When the ENTER/YES button is pressed, “TEMP=
SAVE” will be displayed for some time, followed by “TEMP
ADJUST”.
When the EDIT/NO button is pressed, “TEMP ADJUST”
will be displayed immediately.
ADJUST”.
When the EDIT/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”.
+
–
–
BD board
digital voltmeter
CN110 pin
5
(I+3 V)
CN110 pin
4
(IOP)
Optical pick-up
objective lens
laser
power meter
power meter
5-6.
LASER POWER ADJUSTMENT
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
0 button
or
) button and move the optical pick-up.)
Connect the digital voltmeter to CN110 pin
5 (I+3 V) and
CN110 pin
4 (IOP) of the BD board.
2. Turning the SELECTOR knob and display “LDPWR AD-
JUST”.
(Laser power: for adjustment)
(Laser power: for adjustment)
3. Press the ENTER/YES button and display “LD 0.9 mW $
”.
4. Turning the SELECTOR knob so that the reading of the la-
ser power meter becomes 0.82 to 0.91 mW.
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 $
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 $
” will be displayed for a moment.)
5. Then “LD 7.0 mW $
”will be displayed.
6. Turning the SELECTOR knob 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 non-
volatile memory.
(“LD SAVE $
ENTER/YES button and save the adjustment result in the non-
volatile memory.
(“LD SAVE $
” will be displayed for a moment.)
Note: Do not perform the emission with 7.0 mW more than 15
seconds continuously.
7. Turning the SELECTOR knob 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.
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 digital
voltmeter satisfy the specified value.
voltmeter satisfy the specified value.
Specification:
Laser power meter reading : 7.0 ± 0.2 mW
Digital voltmeter reading
Digital voltmeter reading
: Optical pick-up displayed value ±10%
10. Press the EDIT/NO button and display “LDPWR CHECK”,
and stop the laser emission.
(The EDIT/NO button is effective at all times to stop the la-
ser emission.)
(The EDIT/NO button is effective at all times to stop the la-
ser emission.)
KMS260A
27X40
B0825
B0825
lOP=82.5 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/1 (
lOP (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
(Optical pick-up label)
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