Sony HCD-MD5 User manual

MICROFILM
AEP Model
UK Model
E Model
Tourist Model
SERVICE MANUAL
MINI Hi-Fi COMPONENT SYSTEM
HCD-MD5
SPECIFICATIONS
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 7 mm
aperture.
Frequency response 2 Hz – 20 kHz (±0.5 dB)
CD OPTICAL DIGITAL OUT
(Square optical connector jack, rear panel)
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
Amplifier section
DIN power output 40 W + 40 W
(6 ohms, at 1 kHz, DIN)
Continuous RMS power output
50 + 50 watts
(6ohmsat1kHz,10%THD)
Peak music power output
700 watts
Music power output 160 watts
Inputs VIDEO/GAME IN
(phono jacks)
(switchable)
VIDEO IN:
voltage 250 mV,
impedance 47 kilohms
GAME IN:
voltage 450 mV,
impedance 47 kilohms
TAPE IN (phono jacks):
voltage 250mV,
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.
Model Name Using Similar Mechanism HCD-W55
CD CD Mechanism Type
CDM38A-5BD19
Section Base Unit Name BU-5BD19
Optical Pick-up Name KSS-213B/K-N
Model Name Using Similar Mechanism NEW
MD MD Mechanism Type MDM-2FR
Section Base Unit Name MBU-2F
Optical Pick-up Name KMS-210A/J-N
– Continued on next page –
HCD-MD5 is the amplifier, CD, MD
and tuner section in DHC-MD5.
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation.

– 2 –
TABLE OF CONTENTS
1. SERVICING NOTES .................................................. 3
2. GENERAL
Index to Parts and Controls ............................................... 5
3. DISASSEMBLY............................................................ 7
4. TEST MODE ................................................................. 14
5. ELECTRICAL ADJUSTMENTS
MD Section........................................................................ 20
Tuner Section..................................................................... 25
CD Section......................................................................... 26
6. DIAGRAMS
6-1. Block Diagrams
CD Section......................................................................... 29
Tuner Section..................................................................... 31
MD Section........................................................................ 35
Main Section...................................................................... 39
6-2. Schematic Diagram – Tuner Section –
(AEP, G, UK model).......................................................... 44
6-3. Printed Wiring Board – Tuner Section –
(AEP, G, UK model).......................................................... 46
6-4. Printed Wiring Board – Tuner Section –
(EXCEPT AEP, G, UK model).......................................... 47
6-5. Schematic Diagram – Tuner Section –
(EXCEPT AEP, G, UK model).......................................... 48
6-6. Printed Wiring Board – CD Section – ............................... 50
6-7. Schematic Diagram – CD Section – .................................. 53
6-8. Printed Wiring Board –MD Section – ............................... 56
6-9. Schematic Diagram –MD Section – .................................. 59
6-10. Schematic Diagram – Digital Section – ............................ 63
6-11. Printed Wiring Boards – Digital Section – ........................ 67
6-12. Schematic Diagram – Relay Section – .............................. 70
6-13. Printed Wiring Board – Relay Section – ........................... 73
6-14. Printed Wiring Board – Main Section – ............................ 76
6-15. Schematic Diagram – Main Section – ............................... 79
6-16. Schematic Diagram – Power Section – ............................. 83
6-17. Printed Wiring Boards – Power Section – ......................... 87
6-18. Schematic Diagram – PowerAMP Section – .................... 92
6-19. Printed Wiring Boards – PowerAMP Section –................ 95
6-20. Schematic Diagram – Panel Section –............................... 99
6-21. Printed Wiring Boards – Panel Section – ........................ 103
6-22. IC Pin Function Description ............................................ 109
7. EXPLODEDVIEWS ................................................. 123
8. ELECTRICAL PARTS LIST .................................. 132
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
Tourist model: 76.0 – 108.0 MHz (50 kHz step)
Other models: 87.5 – 108.0 MHz (50 kHz step)
Aerial FM lead aerial
Aerial terminals 75 ohm unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range
German model:
AM: 522 – 1,611 kHz
(with the interval set at 9 kHz)
AEP, UK models:
MW: 522 – 1,611 kHz
(with the interval set at 9 kHz)
LW: 144 – 288 kHz
(with the interval set at 3 kHz)
Tourist model:
AM: 531 – 1,602 kHz
(with the interval set at 9 kHz)
530 –1,710 kHz
(with the interval set at 10 kHz)
Malaysia, Singapore,
Saudi Arabia,
Hong Kong models:
MW: 531 – 1,602 kHz
(with the interval set at 9 kHz)
530 – 1,710 kHz
(with the interval set at 10 kHz)
SW: 5.95 – 17.90 MHz
Aerial AM loop aerial
External aerial terminals
Intermediate frequency 450 kHz
General
Power requirements 220 – 230 V AC, 50/60 Hz
(AEP, German model)
110 – 120 V or 220 – 240 V AC,
50/60 Hz Adjustable with the
voltage selector (Other model)
Power consumption 85 watts (Tourist model)
130 watts (Other models)
Dimensions
Amplifier/Tuner/MD/CD section:
Approx. 280 ×240 ×360 mm
(11 1/8×9 1/2×14 1/4in) (w/h/d) incl.
projecting parts and
controls
(U.K., Hong Kong model)
Approx. 280 ×240 ×350 mm
(11 1/8×9 1/2×13 7/8in) (w/h/d) incl.
projecting parts and
controls (Other models)
Mass
Amplifier/Tuner/MD/CD section:
Approx. 9.4 kg
(20 lb 12 oz)
Supplied accessories: AM loop aerial (1)
Remote RM-S5MD (1)
Sony SUM-3 (NS)
batteries (2)
FM lead aerial (1)
Speaker cords (2)
Design and specifications are subject to change without notice.

– 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 electrostatic
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 emission, ob-
serve 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 re-
pairing.
•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 pro-
cedures other than those specified herein may result in
hazardous radiation exposure.
Laser component in this product is capable of emitting radia-
tion exceding the limit for Class 1.
This appliance is classified as a
CLASS 1 LASER product.
The CLASS 1 LASER PROD-
UCT MARKING is located on the
rear exterior.
This caution label
is located inside
the unit.
Note:
Be sure to connect all wires (including FFC) in the MD
section before applying power or ICs may be damaged.
MODEL PARTS No
AEP model 4-984-208-1π
UK model 4-984-208-2π
Saudi Arabia, Singapore, 4-984-208-3π
Malaysia model
German model 4-984-208-4π
Hong Kong model 4-984-208-5π
Tourist model 4-984-208-7π
Parts No.

– 4 –
COLD START METHOD
While pressing the POWER key, insert the AC plug cord into the
AC outlet. Cold start will be set.
Note :
As cold start will erase all the preset contents etc., do not set it in
normal operations.
FORCED RESET SWITCH
The switch on the power board (S101) is the forced reset switch for
IC201.
Press it for about one second after turning on the power after disas-
sembling and assembling the unit again.
•Parts Location
[POWER BOARD] — Component side —
CN803 CN802 IC821
IC102
S101
RESET
Switch
CN807
CN808

– 5 –
SECTION 2
GENERAL This section is extracted
from instruction manual.
Front Panel
IndextoPartsand Controls
1TUNER/BAND button 2PLAY MODE/TUNING MODE button 3REPEAT/STEREO/MONO button 41/ALL DISCS button 5DISPLAY button 6TIMER SET button 7TIMER SELECT button 8EDIT/NO button 9MULTI JOG control 0ENTER/YES button !¡ º/‚(fast backward/fast forward)
←/→CUSOR button
!™ VOLUME control !£ CHARACTER button !¢ PRESET EQ button
!∞ SYSTEM POWER switch !§ FUNCTION button !¶ MD control button
·(MD play) button ∏(MD pause) button π(MD stop) button §(MD EJECT) button MD slot
!• DBFB button !ª GROOVE button @º CD SYNC button @¡ rREC button @™ PHONES jack @£ LOOP button @¢ EX-CHANGE button @∞ DISC SKIP button @§ CD control button
·(CD play) button ∏(CD pause) button π(CD stop) button §(CD EJECT) button
@¶ DISC 1-3 buttons @• DISC TRAY

123
5
67
4
6
EXCEPT AEP,
German, UK mode
l
AEP, German, UK model
8
Rear Panel
1CD OPTICAL DIGITAL OUT jack 2SPEAKER connectors 3AU BUS connector 4TAPE input/output jack 5VIDEO GAME/VCR connectors 6Aerial terminals 7SIGNAL Ground terminal 8VOLTAGE SELECTOR
(Malaysia, singapore, Saudi Arabia, Hong Kong,Tourist model)

– 6 –

– 7 –
Note: Follow the disassembly procedure in the numerical order given.
CASE, FRONT PANEL ASS’Y
SECTION 3
DISASSEMBLY
1 connector
(CN881)
3 five screws
(BV3
× 8)
POWER BOARD
1 four screws
(CASE 3 TP2)
1 four screws
(CASE 3 TP2)
3 flat wire (19 core)
(CN805)
6 three claws
7 front panel ass‘y
3 flat wire (22 core)
(CN103)
4 connector
(CN906)
2 case
5 three screws
(BV3
× 8)
1 two connectors
(CN802, 803)
5 POWER board
2 flat wire (21 core)
(CN807)
2 flat wire (23 core)
(CN808)
4 connector
(CN804)
1 four screws
(CASE 3 TP2)

– 8 –
BRACKET (MAIN) SECTION
3 cover (FFC)
4 flat wire (21 core)
(CN807)
5 three screws
(BV3
× 8)
1 three screws
(BV3
× 8)
2 supplied OPT cap
1 four screws
(BV3
× 8)
5 three screws
(BV3
× 8)
6 bracket (MAIN)
section
SHIELD CASE (MD)
1 eight screws
(BV3
× 8)
2 shield case
(MD)
1 two screws
(BV3
× 8)

– 9 –
CD MECHANISM
2 CD mechanism
1 two boss
MD MECHANISM SECTION
4 MD mechanism
section
1 connector
(CN101)
2 screw
(BV3
× 8)
3 cover (MDM)
(AEP, UK, German)
2 three screws
(BV3
× 8)

– 10 –
DISC TRAY
MD MECHANISM
3 flat wire (8 core)
4 two claws
2 Pull the disc tray.
5 Remove the disc tray.
1 Rotate the cam to direction
of the arrow.
claw B
claw A
Note: When mounting the disc tray, route a flat
cable through claw
A and B as shown
in the figure.
flat wire
4 two screws
(B2.6
× 18)
5 two
collars
6 screw (BTT2.6 × 4)
3 flat wire (18 core)
(CN221)
3 flat wire (30 core)
(CN202)
2 connector (CN251)
lever (SLM)
Slider (M) ass’y
1 Turn the lever (SLM) toward
direction
A , and slide the slider
(M) assembly toward direction
B .
4 two screws
(B2.6
× 18)
5 two collars
7 MD mechanism
B
A

– 11 –
INSTALLATION DISC TRAY
Note: When mounting the disc tray, the collars
A and B mustbeengagedinthegrooves
respectively.
SLIDER (M) ASS’Y
claw B
claw A
1 Remove a torsion coil
spling from the claw
A .
2 Disengaging the claw B ,
raisethelever (SLM)upward
to remove.
3 Slidetheclaw C oftheslider
(M) assembly up the base
groove in direction
A , and
raisetheslider (M) assembly
in direction
B to remove.
base groove
A
claw C
callar A
ditch
callar B
B

– 12 –
When mounting the base unit, insert the
portion A into a groove in the BU cam.
When mounting the BU cam assembly,
it must be engaged with the rotaly
encorder switch as shown.
portion A
INSTALLATION BU CAM ASS’Y BASE UNIT, ROTALY ENCODER
BASE UNIT, LOADING MOTOR ASS’Y
3 belt
4 two screws
(B2.6
× 5)
5 connector
(CN192)
6 loading motor ass’y
1 screw
(BV3
× 6)
2 base unit
1 screws
(BV3
× 6)

– 13 –
1 Turn fully the lever (SLM)
toward direction
A .
2 Slide the slider (M) assembly
toward direction
B unit it can
be locked with the lever (SLM).
INSTALLATION SLIDER (M) ASS’Y
A
B

– 14 –
4-3. AGING MODE FOR CD AND MD SECTIONS
4-3-1. Setting the Aging Mode
1. Load the mini disc (recordable disc) into the MD slot and three
discs onto the CD tray.
2. Turn OFF the power of the unit, and set the aging mode by press-
ing the following keys together.
DISPLAY + ∏(MD) + GROOVE
4-3-2. Releasing the Aging Mode
1. Press the POWER key.
2. The unit sets into the mode for normal operations.
4-3-3. Operating the Aging Mode
1. When this mode is set, synchro dubbing onto the mini disc is
started, and each time a cycle ends, the cycle number is dis-
played. When the mini disc has recorded 40 songs on its 30
second track, it erases all the songs.
2. During the aging mode, the VOL display blinks.
SECTION 4
TEST MODE
Table 4-1
Key Function Display
DBFB ON/OFF switching of the DBFB DBFB-1/
function DBFB-0
DISC 1 Equalizer minimum EQ-MIN
DISC 2 Equalizer flat EQ-FLT
DISC 3 Equalizer maximum EQ-MAX
rREC Volume center VOL indicator
center position
VOLUME
Volume maximum
VOL indicator
maximum position
VOLUME
Volume minimum
VOL indicator
minimum position
FUNCTION
VIDEO/GAME function on VIDEO/GAME
switching
4-2-3. Operating the Check Mode
* When the following keys are pressed in the check mode state (Re-
fer to Table 4-1.), the switching state of the DBFB, VOLUME,
EQUALIZER functions and VIDEO/GAME functions can be
checked.
Note:
Be sure to connect all wires (including FFC) in the MD
section before applying power or ICs may be damaged.
4-1. OUTLINE
This unit is provided with the following test modes.
1. Check mode for amplifier section
2. Aging mode for CD and MD sections
3. Fluorescent indicator tube and check mode for keys
4. Tracking balance display mode for CD section
5. Check mode for clock function
6. Test mode for MD section
4-2. CHECK MODE FOR AMPLIFIER SECTION
4-2-1. Setting the Check Mode
•Turn ON the power of the unit, and set the check mode by press-
ing the following keys together.
PLAY MODE + π(CD) + GROOVE
When set, the following will be displayed.
4-2-2. Releasing the Check Mode
1. Press the POWER key.
2. The unit sets into the mode for normal operations.
EQ - FLT
TUNER
DBFB
AE -0
VOL
maximum indicatio
n
Differs according to the destination.
AEP,UK models : AE
German model : AE4
Saudi Arabia, Hong Kong, Singapore,
Malaysia models : EA3
Tourist model : JE
The function before the check
mode is set is displayed.
(E.g.)
If the function before the check
mode is set is CD, then “CD”
will be displayed.

– 15 –
3. If errors occur during or after aging, the error messages in the
following table will be displayed.
Table 4-2.
4-4. FLUORESCENT INDICATOR TUBE AND
CHECK MODE FOR KEYS
4-4-1. Setting the Check Mode
•Turn OFF the power of the unit, and set the check mode by press-
ing the following keys together.
§(MD) + π(MD) + GROOVE
When set, the fluorescent indicator tube and all LEDs will light
up.
4-4-2. Releasing the Check Mode
•Press the POWER key during the check mode for the fluores-
cent indicator tube, or press any key during the check mode for
each key when the display shows “KEY = OK”.The unit sets into
the mode for normal operations.
4-4-3. Operating the Check Mode
•Each time the ENTER/YES key is pressed in the check mode for
the fluorescent indicator tube, the display changes in three ways.
The LED lighting pattern can be changed by rotating the MULTI
JOG dial.
•Check Mode of Keys
Press the EDIT/NO key to set this mode.
When set, the following will be displayed.
MD Section
CD Section
Note 1:
The display counts up each time a key is pressed.
(It will not count up when a key already pressed once is pressed
again.) The order of pressing the key and the count up are not
related.)
When a key is pressed.
When all the keys are pressed,
this will be displayed.
(There are altogether 33 keys.)
When a key is pressed during
this display, this check mode
will end.)
CD1*99 1m23s
track number
disc number
Point at which sound
jumps occurred.
* is displayed at the point the
sound jump occurred.
- is displayed normally.
KEY=0JOG
=
0
K
KEY=0JOG
=0
KEY=1JOG=0
KEY=JOG=0
O
Error Message Contents
MD A-Erase NG Cannot all-erase MD.
MD R-Pause NG Cannot record-pause MD.
MD D-Input NG Cannot lock MD digital in.
Cannot playback last MD song.
MD Play NG (The played back track is not the last
track (access error)).
MD TOC NG MD TOC are abnormal.
(The total track is abnormal.)
MD No Disc NG Cannot read MD TOC.
(Disc error)
CD Focus NG CD focus NG
CD GFS NG CD GFS (Garde frame sync) NG.
CD TOC NG 16 seconds after reading CD TOC.
CD SEARCH NG 16 seconds after CD search.
Not an error message indicating
CD SERVO OK servo system error. May be displayed
during STOP.
Refer to NOTE 1. Sound jumps lasting more than 1
second during play back.

– 16 –
When the MUTLI JOG dial and VOLUME control dial are rotated,
the JOG count display will count up or down accordingly.
(E.g.)
This value will be as follows (JOG
count display).
(When the JOG dial is rotated right.)
Note: To end this mode, KEY=OK must be displayed.
4-5.TRACKING BALANCE DISPLAY MODE FOR
CD SECTION
4-5-1. Setting and Operating the Tracking Balance Indi-
cation Mode
1. Turn ON the power of the unit, and press the [FUNCTION] key
to set the CD mode.
(This mode cannot be set if the function is not CD.)
2. Set this mode by pressing the π(CD) + DISPLAY keys to-
gether.
3. When set, the following will be displayed.
4-6. CHECK MODE FOR CLOCK FUNCTION
4-6-1. Setting and Operating the Check Mode
1. Turn OFF the power of the unit.
2. Set this mode by pressing the π(MD) + DISPLAY keys
together.
3. When set, the clock display will be highlighted.
Note: In this mode, the clock display is highlighted only for a short
time. If necessary, press the π(MD) + DISPLAY keys
together again.
(This mode is automatically released.)
JOG =
0 1 2 99 1
Note:In this mode, the display is lit only for a short time. If neces-
sary, press the πCD + DISPLAY keys together again.
(This mode is automatically released.)
CD .TR BAL 3.2
VOL

– 17 –
4-7. TEST MODE FOR MD SECTION
4-7-1. Setting theTest Mode
•Turn OFF the power of the unit, and set the test mode by pressing
the following keys together.
FUNCTION + PRESET EQ + GROOVE
When set, the following will be displayed.
4-7-2. Replase the Test Mode
1. Press the REPEAT key.
2. The set thus becomes available for normal operation.
4-7-3. Basic Operation of theTest Mode
•All operations are performed using the MULTI JOG dial,
ENTER/YES key, and EDIT/NO key.
•The functions of these keys are as follows.
Table 4-3.
Key Contents
MULTI JOG dial Changes parameters and models.
ENTER/YES key Proceeds onto the next step.
Finalizes input.
EDIT/NO Key Returns to previous step.
Stops operation.
4-7-4. Selecting the Test Mode
Eight test modes are selectied by turning the MULTI JOG dial.
Table 4-4.
Display Contents
TEMP ADJUST Temperature compensation offset
adjustment
LDPWR ADJUST Laser power adjustment
EFBAL ADJUST Traverse (E-F balance) adjustment
FBIAS ADJUST Focus bias adjustment
FBIAS CHECK Focus bias check
CPLAY MODE Continuous playback mode
CREC MODE Continuous reading mode
EEP MODE Non-volatile memory mode (*1)
•For detailed description of each adjustment mode, refer to sec-
tion 5. Electrical Adjustments.
•If a different adjustment mode has been selected by mistake,
press the EDIT/NO key to exit from it.
*1: The EEP MODE is not used in servicing. This mode reads and
writes the contents of the non-volatile memory. If set acciden-
tally, press the EDIT/NO key immediately to exit it.
4-7-5. Operating the Continuous Playback Mode
1. Entering the continuous playback mode
1) Set the disk in the unit (either MO or CD).
2) Turning the MULTI JOG dial and display “CPLAY MODE”.
3) Press the ENTER/YES key to change the display “CPLAY
IN” .
4) When access cpmpletes, the display changes to
“C1 = AD = ”.
Note: The “ ” displayed are arbitrary numbers.
2. Changing the parts to be played-back
1) Press the ENTER/YES key during continuous playback to
change the display to “CPLAY MID”, “CPLAY OUT”.
When pressed another time, the parts to be played-back can
be changed.
2) When access completes, the display changes to
“C1 = AD = ”.
Note: The “ ” display are arbitrary numbers.
3. Ending the continuous playback mode
1) Press the EDIT/NO key. The display will change to “CPLAY
MODE”.
2) Press the §(MD) key and remove the disc.
Notes:
1. The playback start addresses for IN, MID, and OUT are as
follows.
IN: 40h cluster
MID: 300h cluster
OUT: 700h cluster
2. The EDIT/NO KEY can be used to stop playing any time.
4-7-6. Operating the Continuous Recording Mode
1. Entering the continuous recording mode
1) Set the MO disc in the unit.
2) Turning the MULTI JOG dial and display “CREC MODE”.
3) Press the ENTER/YES key to change the display to “CREC
IN”.
4) When access completes, the display changes to “CREC
( )” and REC lights up.
Note: The “ ” displayed are arbitrary humbers.
2. Changing the parts to recorded
1) When the ENTER/YES key is pressed during continuous
recording, the display changes to “CREC MID”, “CREC
OUT” and REC goes off.When pressed another time, the
parts to be recorded can be changed.
2) When access completes, the display changes to “CREC
( )” and REC lights up.
Note: The “ ” displayed are arbitrary numbers.
3. Ending the continuous recording mode
1) Press the EDIT/NO key. The display will change to “CREC
MODE” and REC goes off.
2) Press the §(MD) key and remove the disc.
Notes:
1. The recording start address for IN, MID, and OUT are as
follows.
IN : 40h cluster
MID : 300h cluster
OUT: 700h cluster
M
TBU EMPTest ADJU
Mo
ST
de

– 18 –
2. The EDIT/NO key can be used to stop recording anytime.
3. During the test mode, the erasing-protection tab will not be
detected. Therefore be carefull not to set the continuous re-
cording mode when a disc not 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 carefull not to apply vi-
bration.
4-7-7. Function of other keys
table 4-5.
CentensKey
Sets continuous playback when pressed in the
STOP state. (servo all on)
When pressed during continuous playback, the
tracking and sled servo turns off.
When pressed during tracking and sled servo
turned off, the turns on.
·(MD)
Stop continuous playback and continuous record-
ing. (servo all off)
The sled moves to the outer circumference only
when this is pressed.
π(MD)
)
The sled moves to the inner circumference only
when this is pressed.
0
Turns recording on/off when pressed during con-
tinuous playback.
rREC
Switches between the pit and groove modes when
pressed.
TIME
CONTROL
Switches between the CLV-S (pull-in mode) and
CLV-A (playing servo) modes when pressed.
(Switches the spindle servo mode.)
PLAY
MODE
Switches the display when pressed.
Returns to previous step. Stops operatios.
DISPLAY
§(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-protection tab when the rREC key is pressed.
MODE
display Error rate display Address display
1. MODE display
Display “TEMP ADJUST”, “CPLAY MODE”, etc.
2. Error rate display
Error rates are displayed as follows.
C1 = AD =
C1 = : Indicates C1 error
AD = : Indicates ADER
4-7-8. Test Mode Displays
•Each time the DISPLAY key pressed, the display changes in the
following order.
3. Address display
Address are displayed as follows.
h = s = (MO pit and CD)
h = s = (MO groove)
h = : Header address
s = : SUB Q address
a = : ADIP address
Note: “—” is display when the address cannot be read.

– 19 –
4-7-10. 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) key 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.
Always press the EDIT/NO key first before pressing the
§(MD) key.
2. The erasing-protection tab is not detected in the test mode.There-
fore, when modes which output the recording laser power such
as continuous recording mode and traverse adjustment mode,
etc. are set, 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 record-
ing mode and traverse adjustment mode.
4-7-9. Meanings of Other Displays
Table 4-6.
Display Contents
Light Off Blinking
During continuous Stop state
(
playback (servo all off)
(servo all on)
PTracking and Tracking and
sled servo off sled servo on
Recording mode Recording mode
on off
SYNC CLV lock state CLV unlock state
TRACK Pit mode Groove mode
DISC High reflection Low reflection
rate disc rate disc
LEVEL- Spindle servo Spindle servo
SYNC CLV-S (pull-in CLV-A (playing
mode) mode)
PROGRAM ABCD adjustment
not adjustment
Completed
Focus auto gain Focus auto gain
and tracking successful,
SHUFFLE auto gain tracking auto
successful gain failed
REC

– 20 –
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 BD (MD) board
Pick-up IC171 D101 IC101, IC121, IC191
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.
•Test disc (CD) TDYS-1 (Parts No. 4-963-646-01)
•Laser power meter LPM-8001 (Parts No. J-2501-046-A)
•Oscilloscope
•Digital voltmeter
•Thermometer
5) When observing several signals on the oscilloscope, etc., make
sure that VC and GND do not connect inside the oscilloscope.
(VC and GND 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. Turning the MULTI JOG dial and display “CREC MODE”.
4. Press the ENTER/YES key and display “CREC IN”.
5. Press the ENTER/YES key again to display “CREC MID”.
“CREC (0300)” is displayed for a moment and recording starts.
6. Complete recording within 5 minutes.
7. Press the EDIT/NO key and stop recording.
8. Press the §(MD) key 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.
Note:
Be sure to connect all wires (including FFC) in the MD
section before applying power or ICs may be damaged.
MD SECTION
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 eye-
sight.
5-2. PRECAUTIONS FOR USE OF OPTICAL PICK-
UP (KMS-210A)
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 elec-
tricity. Handle the flexible board with care as it breaks easily.
Optical pick-up flexible board
Laser tap