Sony HCD-MD313 User manual

– 15 –
SECTION 4
TEST MODE
4-1. PRECAUTIONS FOR USE OFTEST MODE
1. As loading related operations will be performed regardless of
the test mode operations being performed, be sure to check that
the disc is stopped before setting and removing it. Even if
the §(MD) button is pressed while the disc is rotating during
continuous playback, continuous recording, etc., the disc will
not stop rotating. Therefore, it will be ejected while rotating.
Be sure to press the §(MD) button after pressing
the ^(CD) button and the rotation of disc is stopped.
2. The erasing-protection tab is not detected in the test mode.
Therefore, operating in the recording laser emission mode and
pressing the rREC button, the recorded contents will be
erased regardless of the position of the tab. When using a disc
that is not to be erased in the test mode, be careful not to enter
the continuous recording mode and traverse adjustment mode.
But “CREC MODE”, “EF MO CHECK” and “EF MO AD-
JUST” is detect the erasing-protection tab and recording laser
power off.
4-1-1. Recording Laser Emission Mode and Operating
Button
1. Continuous recording mode (CREC MODE)
2. Traverse adjustment mode (EF MOADJUST)
3. Laser power adjustment mode (LDPWR ADJUST)
4. Laser power check mode (LDPWR CHECK)
5. When pressing the rREC button.
6. Traverse checking mode (EF MO CHECK)
4-2. SETTINGTHETEST MODE
With the power supply to the set in OFF (standby) status, while
pressing the PLAY MODE button and ^(MD) button simul-
taneously, then release the button.
4-3. RELEASINGTHETEST MODE
Press the REPEAT button, and the power is turned OFF (standby
status), and the set becomes ready for normal operation.
4-4. BASIC OPERATIONS OFTHETEST MODE
All operations are performed using the VOLUME knob button,
p(CD) button, and ^(CD) button. The functions of these
buttons and knob are as follows.
Table 4-1.
4-5. SELECTINGTHETEST MODE
Thirteen test modes are selected by turn VOLUME.
Table 4-2.
• For detailed description of each adjustment mode, refer to the “5.
ELECTRICAL ADJUSTMENTS”.
• Ifa differentadjustmentmodehasbeenselectedby mistake, press
the ^(CD) button to exit from it.
*1: The EEP MODE, Scurve CHECK, MANUAL CMD VERIFY
MODE, SLED MODE, ACCESS MODE, 0920 CHECK,
WRITE sure?, HEAD ADJUST and SVDATA READ are not
used in servicing. If set accidentally, press the ^(CD) but-
ton immediately to exit it.
Display Contents
TEMP CHECK Temperature compensation offset check
LDPWR CHECK Laser power check
EF MO CHECK Traverse (E-F balance) check
EF CD CHECK Travers (Pre mastered disk) check
FBIAS CHECK Focus bias check
CPLAY MODE Continous playback mode
CREC MODE Continous recording mode
Scurve CHECK S-curve check (*1)
VERIFY MODE Non-volatile memory check (*1)
DETRK CHECK Detrack check
TEMPADJUST Temperature compensation offset adjustment
LDPWR ADJUST Laser power adjustment
EF MO ADJUST Traverse (E-F balance) adjustment
EF CD ADJUST Traverse (Pre mastered disk) adjustment
FBIAS ADJUST Focus bias adjustment
EEP MODE Non-volatile memory mode (*1)
MANUAL CMD Manual command transfer mode (*1)
SVDATA READ Data reading out mode (*1)
ERR DP MODE Operation of error histories memory
SLED MOVE Operation of sled moter (*1)
ACCESS MODE Access check (*1)
0920 CHECK Outermost periphery check (*1)
WRITE sure? Non-volatile memory initialize
HEAD ADJUST HEAD adjustment check (*1)
CPLAY2MODE Continous playback mode
CREC2MODE Continous recording mode
Button & Knob Function
VOLUME knob Changes parameters and modes.
p(CD) button Proceeds onto the next step.
Finalizes input.
^(CD) button Returns to previous step.
Stops operations.

– 16 –
4-7. OPERATINGTHE CONTINUOUS RECORDING
MODE
4-7-1. Entering the Continuous Recording Mode
1. Set the MO disc in the unit. (Refer to note 3.)
2. Turn the VOLUME and display “CREC MODE”.
3. Press the p(CD) 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 position ad-
dress.
4-7-2. Changing the Parts to be Recorded
1. When the p(CD) button is pressed during continuous record-
ing, the display changes as below. ( REC indication turns off
during change-over of display.)
4-6. OPERATING THE CONTINUOUS PLAYBACK
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. Turn the VOLUME and display “CPLAY MODE”.
3. Press the p(CD) button to change the display to “CPLAY
MID”.
4. When access completes, the display changes to
“C = AD= )”.
Note: The numbers “ ” displayed show you error rates andADER.
4-6-2. Changing the Parts to be Played-back
1. Press the p(CD) buttonduring 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 andADER.
4-6-3. Ending the Continuous Playback Mode
1. Press the ^(CD)button. The display willchange to“CPLAY
MODE”.
2. Press the §(MD) button and remove the disc.
Notes:
1. The playback start address for IN, MID, and OUT are as fol-
lows.
IN : 40h cluster
MID : 300h cluster
OUT : 700h cluster
In case you want to display the address of the playback position
on the display, press the §(CD) button and display “CPLAY
()”.
2. The ^(CD) button can be used to stop playing anytime.
2. When access completes, the display changes to “CREC ( )”
and REC lights up.
Note: The numbers “ ” displayed shows you the recording position ad-
dress.
4-7-3. Ending the Continuous Recording Mode
1. Press the ^(CD) button. The display will change to “CREC
MODE” and REC goes off.
2. Press the §(MD) button and remove the disc.
Notes:
1. The recording start address for IN, MID, and OUT are as fol-
lows.
IN : 40h cluster
MID : 300h cluster
OUT : 700h cluster
2. The ^(CD) button can be used to stop recording anytime.
3. During the test mode, the erasing-protection tab will not be de-
tected. Therefore be careful not to set the continuous recording
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 vibration.
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
^(CD) button immediately to exit it.
CPLAY MID CPLAY OUT CPLAY IN CREC MID CREC OUT CREC IN

– 17 –
4-9. ERROR HISTORY MODE
4-9-1. Entering the Error History Mode
1. Turn the VOLUME knob and display “ERR DP MODE”.
2. Press the p(CD) button and display “total rec”.
4-9-2. Ending the Error History Mode.
1. Press the ^(CD) button. The display will change to “ERR
DP MODE”.
4-9-3. Selecting the Memory to be History
Five memory types are selected by turning the VOLUME knob.
Table 4-3.
No. Display Contents Function
1 total rec Record time Total time of laser power high.
About20% of totalrecording time.
2 total play playback time Total time of playback.
3 retry err Total retry error
Total count of record and playback
retry error.
4 total err All error count Total count of error.
5 err history Error history Error contents display.
6 err refresh Error refresh Clear the error histories memory
4-9-4. Oprating the displayed histtorys.
• Record time
1. Turn the VOLUME knob and display “total rec”.
2. Press the §(CD) button and display “r h”.
Note • r : total time
• Playback time
1. Turn the VOLUME knob and display “total play”.
2. Press the §(CD) button and display “p h”.
Note • p : total time
• Total retry error
1. Turn the VOLUME knob and display “retry err”.
2. Press the §(CD) button and display “r p ”.
Note • r : Rcord total error
• p : Playback total error
• All error count
1. Turn the VOLUME knob and display “total err”.
2. Press the §(CD) button and display “total ”.
Note • total : total error
• Error history
1. Turn the VOLUME knob and display “err history”.
2. Press the §(CD) button and display “0 C ”.
Note • 0 : Number of error
• C : Error code (See table 4-4.)
4-9-5. Ending the displayed historys
1. Press the §(CD) button, the display will change to memory
types.
Table 4-4.
*
* Error refresh with optical pick-up exchange, another not execute.
Error Contents
Code
00 No error
01 Disc error PTOC does
not read
02 DISC error
UTOC does not read
03 Loading error
04 Address does not read
Error Contents
Code
05 Out of FOK
06 Focus does not work
07 Retry of record
08 Record retry error
09 Retry of Playback
0A Playback retry error

– 18 –
4-10. FUNCTIONS OF OTHER BUTTONS
Table 4-3.
Button Contents
rREC Turns recording on/off when pressed during
continuous playback.
§(MD) Disc eject
Note: The erasing-protection tab in not detected during the test mode.
Recording will start regardless of the position of the erasing-protec-
tion tab when the rREC button is pressed.
4-11. TEST MODE DISPLAYS
Each time the POWER button pressed, the display changes in the
following order.
Note:Auto gain display and IVR display are not used in servicing.
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
POWER button.
1. MODE display
Displays “TEMP ADJUST”, “CPLAY MODE”, etc..
2. Error rate display
Error rates are displayed as follows.
C1= AD=
C1= : Indicates C1 error
AD= : Indicates ADER
3. Address display
Address are displayed as follows.
h= a= (MO groove)
With this display, if POWER button is pressed, the following
will be displayed.
h= s= (MO pit and CD)
h=: Header 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 = / [ ]
A B C
A= Focus servo gain coefficient
B= Tracking servo gain coefficient
C= [OK] or [NG] or [ - -] (not converged)
4-12. MEANINGS OF OTHER DISPLAYS
Table 4-4.
Display Contents
Light Off
REC Recording mode on Recording mode off
DISC High reflection rate disc Low reflection rate disc

– 19 –
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.
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.
Optical pick-up flexible board
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.
• Check Disc (MD) 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
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)
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.
1. Set the test mode.
2. Insert a MO disc (blank disc) commercially available.
3. Turn the VOLUME knob display “CREC MODE”.
4. Press the p(CD) button and display “CREC MID”.
“CREC (0300)” is displayed for a moment and recording starts.
5. Complete recording within 5 minutes.
6. Press the ^(CD) button and stop recording.
7. Press the §(MD) 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 recording.
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.
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 ®® ×®
SECTION 5
ELECTRICAL ADJUSTMENT
MD SECTION
Pick-up
Laser tap
Flexible boar
d

– 20 –
5-5. TEMPERATURE COMPENSATION OFFSET
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
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 temperature of this part has become the ambient tempera-
ture.
Adjusting Method:
1. Turn the VOLUME knob and display “TEMPADJUST”.
2. Press the p(CD) button to change the display to “TEMP =
” (The numbers “ ” displayed shows you the current tem-
perature.)
3. To save the data, press the p(CD) button.
When not saving the data, press the ^(CD) button.
4. When the p(CD) button is pressed, “TEMP= SAVE” will
be displayed for some time, followed by “TEMP ADJUST”.
When the ^(CD) button is pressed, “TEMPADJUST” will
be displayed immediately.
Specifications:
The temperature should be within “E0-EF”, “F0-FF”, “00-0F”,
“10-1F” and “20-2F”.
5-6. LASER POWER ADJUSTMENT
Connection:
Adjusting Method:
1. Set the laser power meter on the objective lens of the optical
pick-up. (When it cannot be set properly, press the
=0button or )+button and move the optical
pick-up.)
Connect the digital voltmeter to TP1004 (I+3 V) and TP1005
(IOP) of the BD (MD) board.
2. Turn the VOLUME knob and display “LDPWRADJUST”.
(Laser power: for adjustment)
3. Press the p(CD) button and display “LD 0.9 mW $ ”.
4. Turn the VOLUME knob so that the reading of the laser power
meter becomes 0.82 to 0.91 mW.
Set the range control on the laser power meter to 10 mW, then
press the p(CD) 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. Turn the VOLUME knob so that the reading of the laser power
meter becomes 6.9 to 7.1 mW, press the p(CD) button and
save the adjustment result in the nonvolatile 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. Turn the VOLUME knob and display “LDPWR CHECK”.
8. Press the p(CD) 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 p(CD) button and display “LD 7.0 mW $ ”.
Check that the reading of the laser power meter and digital volt-
meter satisfy the specified value.
Specification:
Laser power meter reading: 7.0 ± 0.2 mW
Digital voltmeter reading : Optical pick-up displayed value ±10%
10. Press the ^(CD) button and display “LDPWR CHECK”,
and stop the laser emission.
(The ^(CD) button is effective at all times to stop the laser
emission.)
Optical pick-up
objective lens
laser
power mete
r
+
–
BD (MD) board
digital voltmete
r
TP1004 (I+3 V)
TP1005 (IOP)
KMS260A
27X40
B0567
lOP=56.7 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/1 (
Ω )
(Optical pick-up label)

– 21 –
5-7. TRAVERSE (E-F BALANCE) ADJUSTMENT
Note 1: Data will be erased during MO reading if a recorded disc is 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.
Connection:
Adjusting Method:
1. Connect an oscilloscope to TP1002 (TEO) and TP1003 (VC)
of the BD (MD) board.
2. Load a MO disc (any available on the market). (Refer to note
1.)
3. Press the =0button or )+button and move the
optical pick-up outside the pit.
4. Turn the VOLUME knob and display “EF MOADJUST”.
5. Press the p(CD) button and display “EFB= MO-R”.
(Laserpower READ power/focusservoON/trackingservo OFF/
spindle (S) servo ON)
6. Turn the VOLUME knob so that the waveforms of the oscillo-
scope becomes the specified value. (When theVOLUME knob
is turned, the “ ” of “EFB= MO-R” changes and the wave-
form 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)
7. Press the p(CD) button, and save the result of adjustment to
the non-volatile memory.
(“EFB= SAVE” will be displayed for a moment. Then
“EFB= MO-W” will be displayed.)
8. Turn theVOLUME knob so that the waveforms of the oscillo-
scope becomes the specified value. (When theVOLUME knob
is turned, the “ ” of “EFB= MO-W” changes and the wave-
form 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)
(Traverse Waveform)
9. Press the p(CD) button, and save the result of adjustment to
the non-volatile memory.
(“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 VOLUME knob until the waveforms of the oscillo-
scope 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.
(Traverse Waveform)
12. Press the p(CD) button, and save the result of adjustment to
the non-volatile memory.
(“EFB= SAVE” will be displayed for a moment. Then
“EFBALADJUST” will be displayed.)
The disc stops rotating automatically.
13. Turn the VOLUME knob and display “EF CD ADJUST”
14. Press the §(MD) button and remove the MO disc.
15. Load the test disc TDYS-1.
16. Press the p(CD) button and display “EFB= CD”.
Servo is imposed automatically.
17. Turn the VOLUME knob until the waveforms of the oscillo-
scope 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.
(Traverse Waveform)
18. Press the p(CD) button, and save the result of adjustment to
the non-volatile memory.
(“EFB= SAVE” will be displayed for a moment. Then
“EFBAL CD” will be displayed.)
19. Press the §(MD) button and remove the test disc TDYS-1.
+
–
oscilloscope
(DC range)
10 pF
330 k Ω
TP1002 (TEO)
TP1003 (VC)
BD (MD) board
+
–
BD (MD) board
TP1002 (TEO)
TP1003 (VC)
oscilloscope
(DC range)
V: 0.1 V/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

– 22 –
5-8. FOCUS BIAS ADJUSTMENT
Adjusting Method:
1. Load a continuously recorded disc (Refer to “5-4. Creating MO
Continuously Recorded Disc”.).
2. Turn the VOLUME knob and display “CPLAY MODE”.
3. Press the p(CD) button and display “CPLAY MID”.
4. Press the POWER button when “C1= AD= ” is dis-
played.
5. Turn the VOLUME knob and display “FBIASADJUST”.
6. Press the p(CD) button and display “ / a= ”.
The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [a=] indicate the
focus bias value.
7. Turn the VOLUME knob in the clockwise direction and find
the focus bias value at which the C1 error rate becomes 220.
(Refer to note 2.)
8. Press the p(CD) button and display “ /b= ”.
9. Turn theVOLUME knob in the counterclockwise derection and
find the focus bias value at which the C1 error rate becomes
220. (Refer to note 2.)
10. Press the p(CD) button and display “ / c= ”.
11. Check that the C1 error rate is below 50 and ADER is 00.
Then press the p(CD) button.
12. If the “( )” in “ - - ( )” is above 20, press the
p(CD)button.
If below 20, press the ^(CD) button and repeat the adjust-
ment from step 2 again.
13. Press the ^(CD) button and press the §(MD) button to
remove the continuously recorded disc.
Note 1: The relation between the C1 error and focus bias is as shown in the
following figure. Find points a and b in the following figure using
the above adjustment. The focal point position c is automatically
calculated from points a and b.
Note 2: As the C1 error rate changes, perform the adjustment using the av-
erage vale.
5-9. ERROR RATE CHECK
5-9-1. CD Error Rate Check
Checking Method:
1. Load a test disc TDYS-1.
2. Turn the VOLUME knob and display “CPLAY MODE”.
3. Press the p(CD) button and display “CPLAY MID”.
4. “C1= AD= ” is displayed.
5. Check that the C1 error is below 20.
6. Press the ^(CD) button, stop playback, press the
§(MD) EJECT button, and remove the test disc.
5-9-2. MO Error Rate Check
Checking Method:
1. Load a continuously recorded disc (Refer to “5-4. Creating MO
Continuously Recorded Disc”.).
2. Turn the VOLUME knob and display “CPLAY MODE”.
3. Press the p(CD) button and display “CPLAY MID”.
4. “C1= AD= ” is displayed.
5. If the C1 error is below 50, check that ADER is 00.
6. Press the ^(CD) button, stop playback, press the
§(MD) button, and remove the continuously recorded disc.
5-10. FOCUS BIAS CHECK
Change the focus bias and check the focus tolerance amount.
Checking Method:
1. Load a continuously recorded disc (Refer to “5-4. Creating MO
Continuously Recorded Disc”.).
2. Turn the VOLUME knob and display “CPLAY MODE”.
3. Press the p(CD) button and display “CPLAY MID”.
4. Press the POWER button when “C1= AD= ” is dis-
played.
5. Turn the VOLUME knob and display “FBIAS CHECK”.
6. Press the p(CD) button and display “ / c= ”.
The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [c=] indicate the
focus bias value.
Check that the C1 error is below 50 and ADER is 00.
7. Press the p(CD) button and display “ / b= ”.
Check that the C1 error is not below 220 andADER is not above
00 every time.
8. Press the p(CD) button and display “ / a= ”.
Check that the C1 error is not below 220 andADER is not above
00 every time.
9. Press the ^(CD) button, next press the §(MD) button,
and remove the continuously recorded disc.
Note 1: If the C1 error and ADER are above 00 at points a or b, the focus
bias adjustment may not have been carried out properly. Adjust
perform the beginning again.
C1 error
220
bca
Focus bias value
(F. BIAS)

– 23 –
5-11. ADJUSTING POINTS AND CONNECTING POINTS
[BD (MD) BOARD] (SIDE A)
[BD (MD) BOARD] (SIDE B)
IC171
IC101
Q102
IC121
IC316
Q163
TP (IOP)
TP
(VC)
TP
(TEO)
TP (I + 3V)
D101
IC192

– 24 –
Notes:
1. CD Block basically constructed to operated without adjustment.
Therefore, check eaech item in order given.
2. UseYEDS-18 disc (Part No.: 3-702-101-01) unless otherwise
indicated.
3. Use the oscilloscope with more than 10 MΩimpedance.
4. Clean an object lens by an applicator with neutral detergent
when the signal level is low than specified value with the fol-
lowing checks.
5. Adjust the focus bias adjustment when optical pick-up is re-
placed.
Focus Bias Adjustment
This adjustment is to be done when the optical pick-up is replaced.
Condition: This adjustment is performed with the set placed hori-
zontally.
Connection:
CD SECTION
Adjustment Procedure:
1. Connect the oscilloscope to TP (RF) andTP (VC) on BD (CD)
board.
2. Turned power switch on. (stop mode)
3. Put disc (YEDS-18) in and press the ^button.
4. Adjust RV101 so that the oscilloscope waveform is as shown in
the figure below (eye pattern).
A good eye pattern means that the diamond shape (≈) in the
center of the waveform can be clearly distinguished.
5. After adjustment, check the RF signal level.
• RF signal reference waveform (eye pattern)
When observing the eye pattern, set the oscilloscope for AC
range and raise vertical sensitivity.
S-Curve Check
Connection:
Procedure:
1. Connect the oscilloscope to TP (FEO) andTP (VC) on BD (CD)
board.
2. Connect the TP (FOK) and TP (GND) with lead wire.
3. Turned power switch on.
4. Put disc (YEDS-18) in and turned power switch on again and
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
5. Confirm that the oscilloscope waveform (S-curve) is symmetri-
cal between A and B. And confirm peak to peak level within
2.4 ± 0.7 Vp-p.
S-curve waveform
6. After check, remove the lead wire connected in step 2.
Note: • Try to measure several times to make sure that the ratio of
A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the bright-
ness to obtain best waveform.
RF Level Check
Connection:
Procedure:
1. Connect the oscilloscope to TP (RF) andTP (VC) on BD (CD)
board.
2. Turned power switch on. (stop mode)
3. Put disc (YEDS-18) in and press the ^button.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
Note: Clear RF signal waveform means that the shape “≈” can
be clearly distinguished at the center of the waveform.
RF signal waveform
E-F Balance (Traverse) Check
Connection:
Procedure:
1. Connect the TP100 (ADJ) and Ground with lead wire. (on the
MAIN board)
2. Connectthe oscilloscope toTP (TEO) andTP (VC) on BD (CD)
board.
3. Turned power switch on.
4. Put disc (YEDS-18) in and press the ^button.
5. Press the TIME button. (Tracking servo and sled servo are
turned off.)
6. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0 Vdc, and check this level.
+
–
BD (CD) board
TP (RF)
TP (VC)
oscilloscope
(AC range)
+
–
BD (CD) board
TP (FEO)
TP (VC)
oscilloscope
A
B
symmetry
+
–
BD (CD) board
TP (RF)
TP (VC)
oscilloscope
+
–
BD (CD) board
TP (TEO)
TP (VC)
oscilloscope
(DC range)
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(with the 10 : 1 probe
in use)
1.3 ± 0.3 Vp-p
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(with the 10 : 1 probe
in use)
1.3 ± 0.3 Vp-p
within 2.4 ± 0.7 Vp-p

– 25 –
A
B
VC
specification: A=B
Traverse waveform
level: 300 ± 100 mVp-p
7. After check, remove the lead wire connected in step 1.
Focus/Tracking Gain Adjustment (RV102, RV103)
This gain has a margin, so even if it is slightly off. There is no
problem.
Therefore, do not perform, this adjustment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.
Adjustment Location :
[BD (CD) BOARD] – Side B –
specified value: 2 (A+B)
A-B
× 100 = less than ± 7%
• A+B = 300 ± 100 mVp-p
•
RF
TEI
FEO
FOK
IC102
PCK
FEI
RV101
RV103
TEO
VC RV102
IC101
GND
IC104
IC840
IC601
TP100
(ADJ)
[MAIN BOARD] (1/3) – Conductor Side –

– 65 –
•Waveforms
– CD Section –
1IC101 #¡ (RFO) (PLAY Mode)
500 mV/DIV, 500 ns/DIV 6IC103 @∞ (XPCK)
5.3 Vp-p
14 ns
2IC101 $¢ (TEI) (PLAY Mode)
50 mV/DIV, 1 µs/DIV 7IC103 @™ (BCLK)
5 Vp-p
474 ns
3IC101 2(FEI) (PLAY Mode)
50 mV/DIV, 1 µs/DIV 8IC103 @º (LRCK)
5.1 Vp-p
22.8 µ s
4IC103 3(MDP) (PLAY Mode) 9IC104 6(XTO)
4.6 Vp-p
16.9344 MHz
5IC103 @• (RFCK)
Approx.
150 mVp-p
2.6 Vp-p
7.6 µ s
5.1 Vp-p
136 µ s
1.3 ± 0.3 Vp-p
– MD Section –
1IC101 1, 2(I, J) (PLAY Mode)
Approx.
500 mVp-p
2IC101 4(A) (PLAY Mode)
Approx.
200 mVp-p
1.2 ± 0.2 Vp-p
4IC101 #• (RF) (PLAY Mode)
5IC152 #™ (CAPA–) (PLAY Mode)
4.6 Vp-p
1.5 µ sec
3IC101 8, 9(E, F) (PLAY Mode)
Approx.
150 mVp-p
Approx.
100 mVp-p

– 66 –
!¡ IC121 @¶ (FS256)
6IC152 #¡ (CAPA+) (Play Mode)
3.4 Vp-p
11.2896 MHz
3.4 Vp-p
5.7 µ sec
7IC121 (º (FS4)
3.1 Vp-p
22.5792 MHz
8IC121 !§ (OSCI)
3.4 Vp-p
44.1 kHz
9IC121 @∞ (LRCK)
3.5 Vp-p
2.8224 MHz
0IC121 @§ (XBCK)
4.6 Vp-p
1.5 µ sec
– MAIN Section –
4.3 Vp-p
5 MHz
1IC601 !¡ (XI)
2.6 Vp-p
32 kHz
1IC601 !¢ (XTI)
– AUDIO Section –
1IC1500 !£ (XI)
4.8 Vp-p
4.332 MHz

– 88 –
SECTION 8
ELECTRICAL PARTS LIST
Ref. No. Part No. Description Remark
NOTE:
• Due to standardization, replacements in the
parts list may be different from the parts speci-
fied in the diagrams or the components used on
the set.
• -XX and -X mean standardized parts, so they
mayhavesomedifference from theoriginal one.
• RESISTORS
All resistors are in ohms.
METAL: Metal-film resistor.
METAL OXIDE: Metal oxide-film resistor.
F: nonflammable
• Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when order-
ing these items.
• SEMICONDUCTORS
In each case, u: µ, for example:
uA. . : µA. . uPA. . : µPA. .
uPB. . : µPB. . uPC. . : µPC. .
uPD. . : µPD. .
• CAPACITORS
uF: µF
• COILS
uH: µH
Ref. No. Part No. Description Remark
• Abbreviation
AED : North European
CND : Canadian
G : German
HK : Hong Kong
MY : Malaysia
SP : Singapore
AUDIO
When indicating parts by reference
number, please include the board.
*A-4403-412-A AUDIO BOARD, COMPLETE (AEP, UK, G, AED)
*A-4403-419-A AUDIO BOARD, COMPLETE (MY, SP, HK)
*A-4407-387-A AUDIO BOARD, COMPLETE (CND)
**********************
< CAPACITOR >
C701 1-126-163-11 ELECT 4.7uF 20% 50V
C702 1-126-163-11 ELECT 4.7uF 20% 50V
C703 1-126-163-11 ELECT 4.7uF 20% 50V
C704 1-126-163-11 ELECT 4.7uF 20% 50V
C705 1-126-163-11 ELECT 4.7uF 20% 50V
C706 1-136-165-00 FILM 0.1uF 5% 50V
C707 1-124-464-11 ELECT 0.22uF 20% 50V
C708 1-130-473-00 MYLAR 0.0015uF 5% 50V
C709 1-126-160-11 ELECT 1uF 20% 50V
C712 1-162-294-31 CERAMIC 0.001uF 10% 50V
C713 1-124-589-11 ELECT 47uF 20% 16V
C714 1-136-165-00 FILM 0.1uF 5% 50V
C715 1-136-165-00 FILM 0.1uF 5% 50V
C716 1-124-261-00 ELECT 10uF 20% 50V
C717 1-126-163-11 ELECT 4.7uF 20% 50V
C718 1-162-290-31 CERAMIC 470PF 10% 50V
C719 1-124-589-11 ELECT 47uF 20% 16V
C720 1-124-589-11 ELECT 47uF 20% 16V
C731 1-130-475-00 MYLAR 0.0022uF 5% 50V
C743 1-124-589-11 ELECT 47uF 20% 16V
C751 1-126-163-11 ELECT 4.7uF 20% 50V
C752 1-126-163-11 ELECT 4.7uF 20% 50V
C753 1-126-163-11 ELECT 4.7uF 20% 50V
C754 1-126-163-11 ELECT 4.7uF 20% 50V
C755 1-126-163-11 ELECT 4.7uF 20% 50V
C756 1-136-165-00 FILM 0.1uF 5% 50V
C757 1-124-464-11 ELECT 0.22uF 20% 50V
C758 1-130-473-00 MYLAR 0.0015uF 5% 50V
C759 1-126-160-11 ELECT 1uF 20% 50V
C762 1-124-261-00 ELECT 10uF 20% 50V
C763 1-130-477-00 MYLAR 0.0033uF 5% 50V
C764 1-136-165-00 FILM 0.1uF 5% 50V
C765 1-136-165-00 FILM 0.1uF 5% 50V
C766 1-124-261-00 ELECT 10uF 20% 50V
C767 1-126-163-11 ELECT 4.7uF 20% 50V
C768 1-162-290-31 CERAMIC 470PF 10% 50V
C769 1-162-294-31 CERAMIC 0.001uF 10% 50V
C781 1-130-475-00 MYLAR 0.0022uF 5% 50V
C1501 1-124-589-11 ELECT 47uF 20% 16V
(AEP, UK, G, AED)
C1502 1-164-159-11 CERAMIC 0.1uF 50V
(AEP, UK, G, AED)
C1503 1-162-157-11 ELECT 10uF 20% 16V
(AEP, UK, G, AED)
C1504 1-162-291-31 CERAMIC 560PF 10% 50V
(AEP, UK, G, AED)
C1505 1-126-157-11 ELECT 10uF 20% 16V
(AEP, UK, G, AED)
C1506 1-124-257-00 ELECT 2.2uF 20% 50V
(AEP, UK, G, AED)
C1507 1-102-518-11 CERAMIC 33PF 5% 50V
(AEP, UK, G, AED)
C1508 1-162-288-31 CERAMIC 330PF 10% 50V
(AEP, UK, G, AED)
C1509 1-102-518-11 CERAMIC 33PF 5% 50V
(AEP, UK, G, AED)
C1510 1-162-306-11 CERAMIC 0.01uF 20% 16V
(AEP, UK, G, AED)
C1511 1-162-291-31 CERAMIC 560PF 10% 50V
(AEP, UK, G, AED)
C1512 1-162-306-11 CERAMIC 0.01uF 20% 16V
(AEP, UK, G, AED)
C1513 1-162-301-11 CERAMIC 1500PF 20% 16V
(AEP, UK, G, AED)
C1515 1-162-600-11 CERAMIC 4700PF 20% 16V
(AEP, UK, G, AED)
< CONNECTOR >
CN701 1-779-819-11 CONNECTOR, BOARD TO BOARD 14P
CN702 1-779-819-11 CONNECTOR, BOARD TO BOARD 14P
< DIODE >
D701 8-719-911-19 DIODE 1SS119
D1501 8-719-911-19 DIODE 1SS119 (AEP, UK, G, AED)
< IC >
IC701 8-759-439-30 IC M62428FP
IC702 8-759-634-51 IC M5218AP
IC1500 8-759-450-87 IC BU1922F (AEP, UK, G, AED)
IC1501 8-759-636-55 IC M5218AFP (AEP, UK, G, AED)
Les composants identifiés par une
marque !sont critiquens pour la
sécurité.
Ne les remplacer que par une pièce
portant le neméro spécifié.
The components identifiedbymark
!or dotted line with mark !are
critical for safety.
Replace only with part number
specified.