Sony HCD-MD313 User manual

MINI Hi-Fi COMPONENT SYSTEM
MICROFILM
AEP Model
UK Model
E Model
SPECIFICATIONS
SERVICE MANUAL
HCD-MD313
HCD-MD313 is the amplifier, CD, MD and
tuner section in DHC-MD313.
Model Name Using Similar Mechanism HCD-T1
CD CD Mechanism Type
CDM13C-5BD19
Section Base Unit Name BU-5BD19
Optical Pick-up Name KSS-213B/K-N
Model Name Using Similar Mechanism MDS-MX1
MD MD Mechanism Type MDM-3D
Section Optical Pick-up Name KMS-260A/J1N
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation.
– Continued on next page –
Amplifier section
European model:
DIN power output 25 + 25 watts (6 ohms at 1 kHz, DIN)
Continuous RMS power output
30+30 watts
(6 ohms at 1 kHz, 10% THD)
Music power output 50 +50 watts
Other models:
Peak music power output 400 watts
Continuous RMS power output
25 + 25 watts (6 ohms at 1 kHz, 10% THD)
Inputs TAPE IN (phono jacks):
voltage 250 mV/125 mV, impedance 47 kilohms
Outputs TAPE OUT (phono jacks):
voltage 250 mV impedance 1 kilohms
PHONES (stereo phone jack):
accepts headphones of 8 ohms or more.
SPEAKER: accepts impedance of 6 to 16 ohms.
CD player section
System Compact disc and digital audio system
Laser Semiconductor laser (λ= 780 nm)
Emission duration: continuous
Laser output Max. 44.6 µW*
*This output is the value measured at a distance
of 200 mm from the objective lens surface on the
Optical Pick-up Block with a 7 mm aperture.
Frequency response 2 Hz – 20 kHz
MD deck section
System MiniDisc digital audio system
Laser Semiconductor laser (λ= 780 nm)
Emission duration: continuous
Laser output Max. 44.6 µW*
*This output is the value measured at a distance
of 200 mm from the objective lens surface on the
Optical Pick-up Block with a 7 mm aperture.
Recording time 74 minutes max. (using MDW-74)
Sampling frequency 44.1 kHz
Frequency response 5 Hz to 20 kHz
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 – 108.0 MHz (50 kHz step)
Aerial FM lead aerial
Aerial terminals 75 ohms unbalanced
Intermediate frequency 10.7 MHz

– 2 –
TABLE OF CONTENTS
Self-diagnosis Display..................................................... 2
1. SERVICING NOTES ............................................... 3
2. GENERAL.................................................................... 5
3. DISASSEMBLY.......................................................... 8
4. TEST MODE .............................................................. 15
5. ELECTRICAL ADJUSTMENTS
MD Section...................................................................... 19
CD Section....................................................................... 24
6. DIAGRAMS
6-1. Block Diagrams
CD Section....................................................................... 27
MD Section...................................................................... 29
Main Section.................................................................... 31
6-2. Printed Wiring Board — CD Section — ......................... 33
6-3. Schematic Diagram — CD Section — ............................ 35
6-4. Printed Wiring Boards — MD Section —....................... 39
6-5. Schematic Diagram — MD Section — ........................... 41
6-6. Schematic Diagram — Main board — ............................ 46
6-7. Printed Wiring Boards — Main Section —..................... 51
6-8. Printed Wiring Board —Audio Section — ..................... 53
6-9. Schematic Diagram — Audio Section —........................ 55
6-10. Printed Wiring Boards — Panel/Power Section — ......... 58
6-11. Schematic Diagram — Panel/Power Section — ............. 61
6-12. IC Pin Function Description ............................................ 74
7. EXPLODED VIEWS ................................................ 82
8. ELECTRICAL PARTS LIST................................ 88
AM tuner section
Tuning range
European model:
MW: 522 – 1,611 kHz
(with the interval set at 9 kHz)
LW: 144 – 288 kHz
(with the interval set at 3 kHz)
Other models:
MW: 531–1,602 kHz
(with the interval set at 9 kHz)
SW: 5.95 – 17.90 MHz
(with the interval set at 10 kHz)
General
Power requirements
European model: 220 – 230 V AC, 50/60 Hz
Other models: 110 – 120 V or 220 – 240 V AC, 50/60 Hz
Power consumption: 80 watts
Dimensions
Amplifier/Tuner/MD/CD section:
Approx. 215 ×148 ×320 mm (w/h/d)
incl. projecting parts and controls
Mass
Amplifier/Tuner/MD/CD section:
Approx. 5.5 kg
Supplied accessories: Remote RM-MD313 (1)
Sony batteries (2)
AM loop aerial (1)
FM lead aerial (1)
WARRANTY CARD (1)
Design and specifications are subject to change without notice.
Self-diagnosis Display

– 3 –
SECTION 1
SERVICING NOTES
MODEL IDENTIFICATION
— BACK PANEL —
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK !OR DOTTED
LINE WITH MARK !ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
Notes on chip component replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
•Keep the temperature of soldering iron around 270 ˚C during
repairing.
•Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
•Be careful not to apply force on the conductor when soldering
or unsoldering.
CAUTION
Use of controls or adjustments or performance of proce-
dures other than those specified herein may result in haz-
ardous radiation exposure.
Laser component in this product is capable of emitting radiation
exceding the limit for Class 1.
Thisapplianceisclassifiedas
a CLASS 1 LASER product.
TheCLASS1LASERPROD-
UCT MARKING is located on
the rear exterior.
This caution la-
bel is located in-
side the unit.
Parts No.
MODEL PARTS No.
AEP, UK, German,
AED model 4-993-849-1π
Hong Kong, Malaysia,
Singapore model 4-993-849-2π
Note:
Be sure to connect all wires (including FFC) in the MD
section before applying power or ICs may be damaged.
• Abbreviation
AED: North European

– 4 –
DISC TABLE GETTING OUT PROCEDURE ON
THE POWER SUPPLY IS OFF
1. Insert the tweezers to a hole on bottom of the chassis as shown
a figure, then tern fully it toward direction 2.
2. Pull out the disc table.
disc table
cam
1 tweezers
2
3
FLUORESCENT INDICATOR TUBE/BUTTONS/JOG/
LEDs CHECK MODE
1. Presstwobuttons PLAY MODE and p(MD) simulatneously
for standby status.
2. Fluorescent indicator tube and LEDs are all turned on.
Press FUNCTION button, the fluorescent indicator tube dis-
plays pattern change to cycle.
Turning the VOLUME knob, and the each LED turned on to
order.
3. Press p(CD) button, and the Key check mode.
4. The fluorescent indicator tube displays “KEY=0 JOG=0”.
Each time a button is pressed, “KEY”=value increases.
Howerer, once a button is pressed, it is no longer taken into
account.
“JOG=” value increases like 1, 2, 3... if rotating VOLUME
knob in clock width, or it decreases like 0, 9, 8... if rotating in
cunter clock width.
5. To exit from this mode, press order all buttons (15 buttons), the
displays “KEY=OK”, and press any button, or disconnect the
power cord.
SUB CLOCK CHECK
1. Connect an oscilloscope to IC601 pin (¡ and ground of the
MAIN board.
2. Press two buttons PLAY MODE and §(MD)
Simultaneously, and the fluorescent indicator tube displays
“32.768 kHz (91)”.
3. To check the signal on oscilloscope becomes 32 kHz square
wave.
4. Press POWER button to exit.
TA CHECK
1. Press POWER button and system power On.
2. Press two buttons PLAY MODE and p(CD)
simultaneously, the fluorescent indicator tube displays “TA
Test”.
3. Rotation VOLUME knob in clock width a little, the fluores-
cent indicator tube displays “Volume MAX”.
Rotation VOLUME knob in cunterclock widh a little, the fluo-
rescent indicator tube displays “Volume MIN”.
4. Press CD-MD SYNC button, the fluorescent indicator tube
displays “BASS/TRE MAX”. Press REPEAT button, the fluo-
rescent indicator tube displays “BASS/TRE MIN”. Press
p(MD) button, the fluorescent indicator tube displays “ALL
FLAT”. Press p(CD) button, the fluorescent indicator tube
displays “SURROUND = ON”.
5. Press POWER button to exit, and system power off.

– 5 –
SECTION 2
GENERAL
1POWER button
2MD disk slot
3§(MD) button
4^(MD) button
5p(MD) button
6VOLUME control knob
7^(CD) button
8p(CD) button
9FUNCTION button
!º Fluorescent indicator tube
!¡ CD disc tray
!™ PHONES jack
!£ PLAY MODE • TUNING MODE button
!¢ REPEAT • STEREO/MONO button
!∞ §(CD) button
!§ TUNER/BAND button
!¶ CD-MD SYNC button
!• rREC button
!ª MD/CD =0• TUNER – button
@º MD/CD )+• TUNER + button
1TAPE OUTPUT pin jack
2TAPE INPUT pin jack
3AU BUS jack
4SPEAKER terminal
5VOLTAGE SELECTOR switch
(Except European models)
6AM ANTENNA terminal
7FM ANTENNA terminal
8SIGNAL GND terminal
LOCATION OF CNTROLS
– Front Panel –
– Rear Panel –
12345
6
7
8
9
@º!ª!•!¶!§!∞!¢!£!™
!º
!¡
123 4
5
6
7
8
Europian model
other models

– 6 –
– Remote controller – 1POWER button
2DBFB button
3MUSIC MENU button
4SCROLL button
5BAND button
6MD Pbutton
7MD pbutton
8MD +button
9CD Pbutton
!º CD pbutton
!¡ LOOP button
!™ CD +button
!£ TAPE pbutton
!¢ TAPE Pbutton
!∞ TAPE )button
!§ CLOCK/TIMER SET, button
!¶ DISPLAY button
!• + button
!ª VOL + button
@º VOL – button
@¡ SLEEP button
@™ FUNCTION button
@£ REPEAT button
@¢ PLAY MODE button
@∞ PRESET + buuton
@§ PRESET – button
@¶ MD (button
@• MD =button
@ª CD (button
#º CD =button
#¡ TAPE 9button
#™ TAPE (button
#£ TAPE 0button
#¢ CLOCK/TIMER SELECT button
#∞ EDIT button
#§ – button
#¶ CURSOR ?button
#• CURSOR /button
#ª ENTER/YES button
$º CANCEL/NO button
1
2
3
4
5
6
7
8
9
!º
!¡
!™
!£
!¢
!∞
!§
!¶
!•
!ª
@º
@¡
@™
@£
@¢
@∞
@§
@¶
@•
@ª
#º
#¡
#™
#£
#∞
#§
#¶
#•
#ª
$º
#¢

– 7 –

– 8 –
Note: Follow the disassembly procedure in the numerical order given.
CASE
SECTION 3
DISASSEMBLY
FRONT PANEL/MD MECHANISM DECK SECTION
1 two screws
(case 3 TP2)
2 case
1 two screws
(case 3 TP2)
7 six screws (BVTT 3 × 6)
8 MD mechanism section
5 front panel section
1 two screws
(BVTP 3 × 8)
2 wire (flat type) (23 core)
(CN873)
4 claw
3 connector
(CN490)
6 wire (flat type) (25 core)
(CN820)

– 9 –
BACK PANEL, JACK BOARD
MD MECHANISM DECK (MDM-3D)
7 JACK board
6 wire (flat type) (15 core)
(CN401)
1 connector
(CN590)
8 connector
(CN402)
4 five claws
5 back panel
3 screw
(BVTP 3 × 8)
2 four screws
(BVTP 3 × 10)
1 two screws
(BVTT 2 × 3)
2 MD mechanism deck
(MDM-3D)
1 two screws
(BVTT 2 × 3)
bracket (MD)
2 screw
(BVTP 3 × 10)

– 10 –
CD MECHANISM DECK (CDM13C-5BD19)
BD (MD) BOARD
4 bracket (CD)
3 two screws
(BVTP 3 × 6)
3 two screws
(BVTP 3 × 6)
1 wire (flat type) (19 core)
(CN801)
2 connector
(CN291)
5 two screws
(BVTP 3 × 8)
7 CD mechanism deck
(CDM13C-5BD19)
6 two hooks
3 wire (flat type) (14 core)
(CN106)
5 OP relay flexible board
(CN101)
6 BD (MD) board
4 screw
(BVTP 2 × 4)
1 wire (flat type) (25 core)
(CN107)
2 flexible board
(over write head)
(CN104)

– 11 –
DISC TABLE
SUB CHASSIS
1 screw (BV 3 × 8)
3 Pull the disc table
1 screw (BV 3 × 8)
2 holder (MG) ass'y
1 two step screws
2 two insulators
1 two step screws
2 two insulators
part A
NG
OK
Take care so that the part A
may be right position when installing.
part A
3 sub chassis
part A

– 12 –
OPTICAL PICK-UP (KSS-213B/K-N)
OVER WRITE HEAD
2 over write head
1 screw (P 1.7 × 6)
1 Move the claw in the
directionofthe arrow A .
A
B
2 Remove the sled shaft in the
direction of the arrow B .
3 wire (flat type) (16 core)
(CNU101)
4 Remove the optical pick-up (KSS-213B/K-N)
In the direction of the arrow C .
C

– 13 –
NOTE FOR INSTALLATION
•SLIDER COMPLETE ASS’Y
Install the part A of lever (head up)
to pass over the slider complete ass’y.
part A
OK
NG
Take care not to damage
the detective switch.
slider ass’y
SLIDER COMPLETE ASS’Y
claw
claw
45°
3 Set the shaft of gear (LB) to be at the
position in the figure.
2 retainer (gear)
4 Remove the slider complete ass’y
in the direction of arrow with putting
out of two claws.
1 special screw
(M 1.7 × 1.4)

– 14 –
SHUTTER ASS’Y
1 stopper washer
2 shaft (shutter) A
3 shutter ass’y
shutter ass’y
shaft (shutter) B
hole B
hole A
Wheninstalling,install the shaft (shutter) Ainto
the hole as show in the figune before in-
stalling the shaft (shutter) B into the hole B.
shaft (shutter) A

– 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 differentadjustment mode has been selected by 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 POWER button
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 and ADER.
4-6-2. Changing the Parts to be Played-back
1. Press the p(CD) buttonduringcontinuousplaybacktochange
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. Pressthe ^(CD) button. Thedisplay willchangeto “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 press )+button.
Table 4-3
No. Display Contents Function
1 total rec Record time Total time of laser power high.
About20% oftotal recording 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 MD-CD CYNC 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 §(CD) 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 F= T=
F= Focus auto gain collection value
T= Tracking auto gain collection value
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 “TEMP ADJUST”.
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 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 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)