Sony MZ-B50 User manual

MZ-B50
SERVICE MANUAL
PORTABLE MINIDISC RECORDER
US Model
Canadian Model
AEP Model
Tourist Model
SPECIFICATIONS
Model Name Using Similar Mechanism NEW
Mechanism Type MT-MZB50-165
Optical Pick-up Name LCX-2R
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation
System
Audio playing system
MiniDisc digital audio system
Laser diode properties
Material: GaAlAs
Wavelength: λ= 790 nm
Emission duration: continuous
Laser output: less than 44.6 µW
(This output is the value measured at a distance
of 200 mm from the lens surface on the optical
pick-up block with 7 mm aperture.)
Recording and playback time
Maximum 80 minutes (MDW-80, stereo
recording)
Maximum 160 minutes (MDW-80, monaural
recording)
Maximum 74 minutes (MDW-74, stereo
recording)
Maximum 148 minutes (MDW-74, monaural
recording)
Revolutions
400 rpm to 1,800 rpm (CLV)
Error correction
Advanced Cross Interleave Reed Solomon
Code (ACIRC)
Sampling frequency
44.1 kHz
Sampling rate converter
Input: 32 kHz/44.1 kHz/48 kHz
Coding
Adaptive TRansform Acoustic Coding
(ATRAC)
Modulation system
EFM (Eight to Fourteen Modulation)
Number of channels
2 stereo channels
1 monaural channel
Speaker
28 mm (1 1/8 in.) dia.
Frequency response
20 to 20,000 Hz ±3 dB
Wow and Flutter
Below measurable limit
Inputs
Microphone: stereo mini-jack, 0.35– 1.38 mV
Line in: stereo mini-jack, 69– 194 mV
Optical (Digital) in: optical (digital) mini-jack
Outputs
i: stereo mini-jack
Headphones/earphones: 5 mW + 5 mW
Speaker: 300 mW
– Continued on next page –
Ver 1.1 2001.03
With SUPPLEMENT-1
(9-927-952-83)
9-927-952-12
2001C0200-1
© 2001.3
Sony Corporation
Audio Entertainment Group
General Engineering Dept.

– 2 –
1. SERVICING NOTES 3
2. GENERAL 4
3. DISASSEMBLY
3-1. Panel (Lower) ASSY 6
3-2. Main Board, Sled Control Board 6
3-3. Panel (Upper Lid) ASSY 7
3-4. Key Board Unit 7
3-5. BATT Board, DC Jack Board 8
3-6. Mechanism Deck8
3-7. Optical Pick-up 9
4. TEST MODE 10
5. ELECTRICALADJUSTMENTS17
6. DIAGRAMS
6-1. Explanation of IC Terminals 22
6-2. Block Diagram – Main Section (1/3) – 29
6-3. Block Diagram – Main Section (2/3) – 31
6-4. Block Diagram – Main Section (3/3) – 33
6-5. Printed Wiring Boards – Main Section (1/2) – 35
6-6. Printed Wiring Boards – Main Section (2/2) – 37
6-7. Printed Wiring Boards – Battery Section – 39
6-8. Schematic Diagram – Main Section (1/4) – 41
6-9. Schematic Diagram – Main Section (2/4) – 43
6-10. Schematic Diagram – Main Section (3/4) – 45
6-11. Schematic Diagram – Main Section (4/4) – 47
7. EXPLODED VIEWS
7-1. Panel (Lower) Section 55
7-2. Panel Upper Lid Section 56
7-3. Cabinet (Belt) Section 57
7-4. Mechanism Deck Setion (MT-MZB50-165) 58
8. ELECTRICAL PARTS LIST 59
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE
WITH MARK 0ON THE SCHEMATIC DIAGRAMS AND IN THE
PARTS LIST ARE CRITICALTO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN INTHIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.
Flexible Circuit Board Repairing
• Keep the temperature of the 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.
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.
TABLE OF CONTENTS
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
General
Power requirements
DC 3V
Two LR6 (size AA) alkaline batteries
Battery operation time
Battery life1) (EIAJ2))
Batteries Recording Playback
Two LR6 (size AA) Approx. Approx.
Sony alkaline dry batteries 6 hours 18 hours
1) The battery life may be shorter due to operating
conditions, the temperature of the location, and
varieties of batteries.
2) Measured in accordance with the EIAJ
(Electronic Industries Association of Japan)
standard.
3) When using LR6 (SG) Sony “STAMINA”
alkaline dry batteries (produced in Japan).
4) To prevent interrupted recording due to drained
batteries, use new batteries for recording
operations.
5) When played using the built-in speaker.
Dimensions
Approx. 88.0 ×28.0 ×121.4 mm (w/h/d)
(3 1/2 ×1 1/8 ×4 7/8 in.) not incl. projecting parts
and controls.
Mass Approx. 240 g (8.4 oz)
Supplied accessories
Headphones/earphones with a remote control (1)
Sony LR6 (size AA) dry batteries (2)
Carrying pouch (1)
Hand strap (1)
Design and specifications are subject to change without notice.

– 3 –
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
Never look into the laser diode emission from right above when
checking it for adjustment. It is feared that you will lose your sight.
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
(LCX-2R)
The laser diode in the optical pick-up block may suffer electrostatic
break-down easily. When handling it, perform soldering
bridge to the laser-tap on the flexible board.Also perform measures
against electrostatic break-down sufficiently before the operation.
The flexible board is easily damaged and should be handled with
care.
OPTICAL PICK-UP FLEXIBLE BOARD
SECTION 1
SERVICING NOTES
•When repairing this device with the power on, if you remove the
MAINboard or openthe upper panelassy,this device stopswork-
ing.
In this case, you can work without the device stopping by fasten-
ing the hook of the open/close detect switch (S801).
•This set is designed to perform automatic adjustment for each
adjustment and write its value to EEPROM. Therefore, when
EEPROM (IC802) has been replaced in service, be sure to per-
form automatic adjustment and write resultant values to the new
EEPROM.
(Refer to Section 5 Electrical Adjustment. (page 17))
•Replacement of CXD2660GA (IC502) and CXR701080-020GA
(IC801) used in this set requires a special tool.
laser-ta
p
S801

–4 –
SECTION 2
GENERAL
LOCATION AND FUNCTION OF CONTROLS
– Front of the recorder –
– Back of the recorder –
This section is extracted from
instruction manual.
1
2
3
4
5
6
7
8
9
0
qa
qs
qd
qf
qg
qh
qj
qk
ql
w;
wa
ws
wd
wf
1EASY SEARCH +/–buttons
2VOR indicator
3PLAY MODE button
4DISPLAY button
5.REVIEW/AMS/>CUE/AMS
(search /AMS) button
6FAST PB button
7xSTOP button
8i(headphones/earphones) jack
9OPEN switch
0NPLAY (play) button
qa XPAUSE button
qs HOLD switch
qd Display window
qf Microphones
qg Speaker
qh EDIT/ENTER button
qj DC IN 3V jack
qk TRACK MARK button
ql ERASE button
w; REC MODE switch
wa VOR button
ws VOL control
wd REC indicator
wf zREC button
2
1
3
7
6
5
4
1Battery compartment
2CLOCK SET button
3SYNCHRO REC (synchro-recording)
switch
4MIC (PLUG IN POWER) jack
5LINE IN (OPTICAL) jack
6MIC SENS switch
7MEGA BASS button

–5 –
1
2
9
0
qj
qs
qd
3
4
5
6
7
8
qa
qf
qg
qh
1
2
3
4
5
7
6
8
9
0
1V-UP indication
2Fast Playback indication
3Disc indication
Shows that the disc is rotating for recording,
playing or editing an MD.
4STEREO (stereo)/MONO (monaural) indication
5Play mode indication
6REC indication
Lights up while recording. When flashing,
the recorder is in record standby mode.
7Pause indication
8SYNC (synchro-recording) indication
9VOR indication
0Mega Bass indication
qa Character information display
Displays the disc and track names, date,
error messages, track numbers, etc.
qs Battery indication
qd REMAIN (remaining time/tracks) indication
Lights up along with the remaining time of the track,
the remaining time of the MD, or the remaining number
of tracks.
qf REC DATE (recorded/current date) indication
Lights up along with the date and time he MD was
recorded. When only “DATE”lights up, the current
date and time are displayed.
qg Time display
qh Level meter
Shows the volume of the MD being played or recorded.
qj AM/PM indication
1Stereo mini plug
2V-UP button
3TRACK MARK button
4HOLD switch
Slide to lock the controls of the remote control.
5X(pause) button
6Headphones/earphones
7x(stop) button
8>N buttons
9.REVIEW/AMS
0VOL control
–The display window –
–The headphones/earphones with a remote control –

–6 –
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. PANEL (LOWER) ASSY
3-2. MAIN BOARD, SLED CONTROL BOARD
zThe equipment can be removed using the following procedure.
1Screws
(B1.7x6)
2Screws
(B1.7x5)
5Screw
(B1.7x5)
Ornament (R)
Ornament (L)
4Claws
6Claw 7Claws
7Claws
3Claw
8
Panel (lower) Ass
y
5 Connector uni
t
(CN801)
6 OP flexible board
0 Remove solder (3 places)
9 Remove solder (4 places)
7 Switch unit
(CN802)
8 Motor flexible board
(CN602)
qa Remove solder (4 places)
4 Screws (1.7x3)
4 Screw (1.7x3)
1 Screws (1.7x3)
2 OPEN
Main board
Sled control board
3
qs
Panel (lower) ASSY Main board, Sled control board
Panel (upper lid) ASSY Key board unit
BATT board, DC jack board
Mechanism deck Optical pick-upSet

–7 –
3-3. PANEL (UPPER LID) ASSY
3-4. KEY BOARD UNIT
1 Screw (step M1.4)
2
Panel (upper lid) ASSY
Spring (UP), tension
3 Claw
3 Claw
1 Screw (step M1.4)
2Screws
(B1.7x4
)
2Screws
(B1.7x4)
6Screws
(1.7x3)
Panel (upper lid) sub ASSY
4Screws
(1.7x3)
8
7
3
5
Cabinet (upper lid)
Button (upper lid)
Key board unit
1Screw,
ornament

–8 –
3-5. BATT BOARD, DC JACK BOARD
3-6. MECHANISM DECK
1Screws (1.7x3)
3
4Screws (1.7x3)
2Insert a precision screwdriver
and move a point of battery
terminal (+) away from a claw.
1Screws (1.7x3)
BATT board
Cabinet (belt)
DC jack board
5 Head flexible board
(CN2001)
8 Motor flexible
board
2 Screws (1.7x2.5)
1 Spacer (flexible cover)
1 Spacer (flexible cover)
7 OP flexible board
6
4
Mechanism deck
(MT-MZB50-165)
Cover (flexible)
2 Screws (1.7x2.5)
3 Screws (step)
4
Cover (flexible)

–9 –
3-7. OPTICAL PICK-UP
8Bearing
5Screw
4Rack spring
3Precision pan screw
(M1.4)
1Washer (0.8 - 2.5)
2Gear (SA)
5Screw 7Pull off the lead screw.
6
Mechanism deck
(MT-MZB50-165)
Optical pick-up
(LCX-2R)
B
A
0
Opening the over write head
toward the direction A , remove the
OP Service assy toward
the direction B .
Note: Do not open the entire assy
forcibly, when opening
the over write head.
9 Peel off the head flexible board
Over write head section

– 10 –
SECTION 4
TEST MODE
[Outline]
• This set provides the Overall adjustment mode (Assy mode) that
allows CD and MO disc to be automatically adjusted when in
the test mode. In this overall adjustment mode, the protect switch
is detected to judge the disc, CD or MO, and each adjustment is
automatically executed in order. If a fault is found, the system
displays its location. Also, the manual mode allows each indi-
vidual adjustment to be automatically adjusted.
• The keys in the description refer to the keys on both set and
remote commander unless otherwise specified. Though LCD
display shows the LCD of the remote commander, same con-
tents are also displayed on the LCD of the set.
[Setting Method ofTest Mode]
There are two different methods to set the test mode:
1Short BP801 (TEST) on the MAIN board with a solder bridge
(connect pin y; of IC801 to the ground). Then, turn on the
power.
2In the normal mode, turn on the HOLD switch on the set. While
pressing the Nkey on the set, press the following set keys
in the following order:
>t>t.t.t>t.t
> t.tXtX
[Operation in Setting theTest Mode]
• When the test mode becomes active, first the display check mode
is selected. (Press xkey once, when the display check mode
is not active.)
• Other mode can be selected from the display check mode.
• When the test mode is set, the LCD repeats the following dis-
play.
LCD display
•When the Xkey is pressed and hold down, the display at that
time is held so that display can be checked.
[Releasing theTest Mode]
For test mode set with the method 1:
Turn off the power and open the solder bridge on BP801 (TEST)
on the MAIN board.
Note: Remove the solders completely. Remaining could be shorted with
the chassis, etc.
For test mode set with the method 2:
Turn off the power.
Note: If electrical adjustment (see page 18) has not been finished com-
pletely, always start in the test mode. (The set cannot start in nor-
mal mode.)
Microprocessor
version
display
All off
All lit
V0.000
000
R
R848
R850
R849 R851
C810
R802
C
807
R
813
R
812
R807
R804
R803
R805
R838
15
106
IC804
C808
*
IC801
X802
X801
BP801
SHORT: TEST MODE
OPEN: NORMAL MODE
L801
GRN
YEL
T
BP801
SHORT: TEST MODE
OPEN: NORMAL MODE
MAIN BOARD (SIDE A)

–11 –
[Configuration ofTest Mode]
[Manual Mode]
Mode to adjust or check the operation of the set by function.
Normally, the adjustment in this mode is not executed.
•Transition method in Manual Mode
1. Setting the test mode. (See page 10)
2. Press the >or [EASY SEARCH +] key activates the manual
mode where the LCD display as shown below.
3. The optical pick-up moves outward or inward while
the >or .key is pressed for several seconds respec-
tively.
4. Each test item is assigned with a 3-digit mode number;
100th place is a major item, 10th place is a medium item, and
unit place is a minor item.
[Manual Mode]
[Servo Mode]
[Audio Mode]
[Power Mode]
[OP Alignment Mode]
[Overall Adjustment Mode]
[Self Diagnosis Display Mode]
Press the > or [EASY SEARCH +] key
[Key Check Mode]
[Test Mode $Display Check Mode%]
Press the x key
Press the x key
Press the x key
Press the x key
Press the . or [EASY SEARCH ] key
Press the Nor [REC] key on the set
Press the [DISPLAY] key
Press the [TRACK MARK] key
on the remote commander for several seconds.
Quit the key check or open the upper panel
[Sound Skip Check Result Display Mode]
LCD display
Manual
000
[EASY SEARCH +] key:100th place of
mode number
increase.
[EASY SEARCH ] key:100th place of
mode number
decrease.
[Major item switching]
[EASY SEARCH +] key: 10th place of
mode number
increase.
[EASY SEARCH ] key: 10th place of
mode number
decrease.
[EASY SEARCH +] key: Increases the
adjusted value
[EASY SEARCH ] key: Decreases the
adjusted value
[Medium item switching]
N key x key
[Minor item switching]
[Adjusted value variation]
X key: When adjusted value is
changed:
Adjusted value is written.
When adjusted value is
not changed:
That item is adjusted
automatically.
[Adjusted value write]
N key
N key: Unit place of mode number
increase.
x key

–12 –
5. Set the mode No. to 011. The display changes a shown below
each time the [DISPLAY] key is pressed.
However in the power mode (mode number 700’s), only the
power adjustment value is displayed.
6. Quit the manual mode, and press xkey to return to the test
mode (display check mode).
[Overall Adjustment Mode]
Mode to adjust the servo automatically in all items.
Normally, automatic adjustment is executed in this mode at the
repair.
Adjust the CD first, when performing adjustment.
•Configuration of overall adjustment
For further information, refer to the Section 5 Electrical Adjust-
ment. (See page 17)
> key . key
> key
Title
display
CD overall
adjusting
CD overall
adjustment
OK
MO overall
adjusting
MO overall
adjustment
OK
CD overall
adjustment
NG
MO overall
adjustment
NG
N key
protect switch ON
All item
OK
protect switch OFF
NG item exists
or x key
NG item exists
or x key
x key
x key
x key
x key
[Test mode $display check mode%]
•Address & Adjusted Value Display
LCD display
•Jitter Value & Adjusted Value Display
LCD display
•Block Error Value & Adjusted Value Display
LCD display
•ADIP Error Value & Adjusted Value Display
LCD display
•Item Title Display
LCD display
mode number
address adjusted value
mode number
jitter value adjusted value
mode number
block error value adjusted value
mode number
ADIP error value adjusted value
mode number
item title adjusted value
LrefPw 01 011
C68S01
011
0FFJ01 011
063B01
011
059A01
011
•Power Supply Adjusted Value
LCD display
fixed display mode numbe
r
adjusted value
AD 85
731

–13 –
[Sound Skip Check Result Display Mode]
This set can display and check the error count occurring during
record and play.
• Setting method of Sound Skip Check Result Display
Mode
1. Setting the test mode. (See page 10)
2. Press the Nor [REC] key on the set activates the sound skip
check result display mode where the LCD displays as shown
below.
3. When Nkey is pressed, the total of error count is displayed
on the LCD, and each time the >key is pressed, the error
count descents one by one as shown below. Also,
when .key is pressed, the error count ascends by one. If
[REC] key on the set is pressed, the error count during record
is displayed.
** : Sound skip check items counter (hexadecimal)
###### : 6-digit address (hexadecimal) where a sound skipped
last
4. When [REC] key on the set is pressed, the total of error count
is displayed on the LCD, and each time the >key is
pressed, the error count descents one by one as shown below.
Also, when .key is pressed, the error count ascends by
one. If Nkey is pressed, the error count during play is dis-
played.
** : Sound skip check items counter (hexadecimal)
###### : 6-digit address (hexadecimal) where a sound skipped
last
Error code Cause of error Description of error
EIB Sound error correction error
Playback Stat Decorder status error
Adrs Cannot access the address
BEmp Buffer becomes empty
BOvr Buffer becomes full and sounds are
dumped
Recording BFul Buffer capacity lowers and data are
forcibly written
Rtry Retry count over
5. Quit the sound skip check result display mode, and press
the xkey to return to the test mode (display check mode).
S a **
000
Adrs**
000
BEmp**
000
######
000
P**R**
000
EIB **
000
BFul** 000
R ry** 000
###### 000
P**R** 000
Bovr** 000
LCD dispaly
P**R**
000
Total of play system error count
Total of record system
error count

–14 –
[Self-Diagnosis Display Mode]
•This set uses the self-diagnosis system in which if an error oc-
curs in recording/playback mode, the error is detected by the
model control and power control blocks of the microprocessor
and information on the cause is stored as history in EEPROM.
By viewing this history in test mode, it helps you to analyze a
fault and determine its location.
Total recording time has been recorded as optical pick-up using
time, and it is compared with the total recording time in the
self-diagnosis display mode to find when an error occurred.
Clear both total recording time and the time in self-diagnosis
display mode, when the optical pick-up was replaced.
1. Setting the test mode. (See page 10)
2. Press the [DISPLAY] key activates the self-diagnosis display
mode where the LCD display as shown below.
3. Then, each time >key is pressed, LCD display descends
by one as shown below. Also, the LCD display ascends by one
when . key is pressed.
4. Quit the self-diagnosis display mode, and press the xkey to
return to the test mode (display check mode).
LCD dispaly
1s 0**
000
** : Self-Dia
g
nosis Data
history code
1s 0**
000
1s 1**
000
1s 2**
000
N 0**
000
N 1**
000
N 2**
000
N-10**
000
N-11**
000
N-12**
000
N-20**
000
N-21**
000
N-22**
000
R ####
000
1
1

–15 –
• Description of Indication History
History code number Description
1st0 The first error
1st1 Total recording time when 1st0 was generated (Higher rank byte)
1st2 Total recording time when 1st0 was generated (Lower rank byte)
N 0 The last error
N 1 Total recording time when N 0 was generated (Higher rank byte)
N 2 Total recording time when N 0 was generated (Lower rank byte)
N-10 One error before the last.
N-11 Total recording time when N-10 was generated (Higher rank byte)
N-12 Total recording time when N-10 was generated (Lower rank byte)
N-20 Two errors before the last.
N-21 Total recording time when N-20 was generated (Higher rank byte)
N-22 Total recording time when N-20 was generated (Lower rank byte)
REC Total recording time *
• Description of Error Indication Codes
[Clearing Self-Diagnosis Data and Total RecordingTime]
1. Setting the test mode. (See page 10.)
2. Move up the jog key on the set or press the [DISPLAY] key on the remote commander activates the self-diagnosis display mode.
3. Press the Xkey or [REC] key on the set during display of self-diagnosis data when clearing the self-diagnosis data, or during display of
total recording time when clearing the total recording time. Thus, “ClrOK?”will be displayed on the LCD, and press the same key again,
and when self-diagnosis data is cleared “ErrCLR”is displayed and the data is cleared.Also when total recording time is cleared, “ReeT
O”is displayed and it is cleared.
* Total recording time
Total recording time is recorded in
minutes. It is recorded in hexadecimal
format and up to 65,535 min. can be
counted.It returns to“0000min”when
recorder goes beyond this limit.
Problem Indication code Meaning of code Description
No error 00 No error
01 Illegal access target address Attempt to access an abnormal address
was specified
Servo error 02 High temperture High temperture
03 Focus error Forcus could not be applied
04 Spindle error Abnormal lotation of disc
21 Initial low battery Abnormal voltage at initialization
Power error 22 Low battery Momentary interruption detected
23 Low battery NI Momentary interruption detected (NiMH)
24 Low battery AM Momentary interruption detected (AM)

–16 –
[Key Check Mode]
This set can check if the set and remote commander function nor-
mally.
•Setting Method of Key Check Mode
1. Setting the test mode. (See page 10)
2. Press the [T MARK] activates the key check mode where all
segments of LCD turn OFF. (At the last two digits of DOT
section, AD value of remote commander key line is displayed
in hexadecimal)
3. When each key is pressed, it is displayed on the LCD, imply-
ing that it was successfully checked as shown below. How-
ever, for the slide switch on the set, it is not checked unless it
is reciprocated.
* The key pressed to enter the key check mode was already
checked at that time.
Set key Key Indication
NPLAY
>FF
.FR
XPAUSE
EASY SEARCH + EASY +
EASY SEARCH –EASY –
xSTOP
REC REC
TRACK MARK T MARK
HOLD (hold) HLDon
HOLD (off) HLDoff
SYNCHRO REC (on) SYCon
SYNCHRO REC (off) SYCoff
PLAY MODE P MODE
DISPLAY DISP
EDIT/ENTER ENTER
FAST PB FAST P
MEGA BASS M BASS
VOR VOR
ERASE ERASE
REC MODE (STEREO) RMODEs
REC MODE (MONO) RMODEm
Remote commander key
Key Indication
N/>rPLAY
.rFR
XrPAUSE
xrSTOP
4. The test mode (display check mode) is automatically activated
when all keys on the set and remote commander were checked
(see above). Also, the test mode (display check mode) gets
back if opening the upper panel during a key check.

– 17 –
SECTION 5
ELECTRICAL ADJUSTMENTS
[Outline]
• In this set, automatic adjustment of CD and MO can be per-
formed by entering the test mode. (See page 10)
However, before starting automatic adjustment, the memory
clear, power adjustment and temperature adjustment must be
performed in the manual mode.
• The keys in the description refer to the keys on both set and
remote commander unless otherwise specified.
Though LCD display shows the LCD of the remote commander,
same contents are also displayed on the LCD of the set.
[Precautions for Adjustment]
1. Adjustment must be done in the test mode only.
After adjusting, release the test mode.
2. Use the following tools and measuring instruments.
• Test CD disc TDYS-1
(Part No. : 4-963-646-01)
Available SONY CD disc
• Recorded MO disc PTDM-1
(Part No. : J-2501-054-A)
Available SONY MO disc (recorded)
• Laser power meter LPM-8001
(Part No. : J-2501-046-A)
• Digital voltmeter
3. Unless specified otherwise, supply DC 3V from the DC IN 3V
jack.
4. Switch position
HOLD switch ................OFF
[Adjustment Sequence]
Adjustment must be done with the following steps.
1. NV Reset (Memory clear)
r
2. Power Supply Manual Adjustment Manual Mode
r
3. Temperature correction
r
4. CD Overall Adjustment
rOverall Mode
5. MO Overall Adjustment












[NV Reset]
• Setting method of NV reset
1. Select the manual mode of test mode, and set mode num-
ber 021NV Reset.
2. Press the Xkey.
3. Press the Xkey once more.
rNV reset (after several seconds)
4. Quit the manual mode, and activate the test mode.
[Power Supply Manual Adjustment]
• Adjustment sequence
Adjustment must be done with the following steps.
1. VC PWM Duty (L) adjustment (mode number: 762)
r
2. VREM PWM Duty (H) adjustment (mode number: 763)
r
3. VREM PWM Duty (L) adjsutment (mode number: 764)
r
4. VC PWM Duty (H) adjustment (mode number: 765)
r
5. VREM PWM Duty (H) adjustment (mode number: 766)
r
6. VREM PWM Duty (L) adjustment (mode number: 767)
LCD display
ResNV
021
LCD display
ResOK?
021
LCD display
Res***
021
Reset!
021

– 18 –
• Adjustment method ofVC PWM Duty (L)
(mode number: 762)
1. Select the manual mode of the test mode, and set the mode
number 762. (See page 11)
2. Connect a digital voltmeter to the TP915 (VC) on the MAIN
board, and adjust [EASY SEARCH +] key (voltage up) or
[EASY SEARCH --] key (voltage down) so that the voltage
becomes 2.5 ±0.02 V.
Proceed to the next step without pressing Xkey if voltage is
already adjusted.
3. Press the Xkey to write the adjusted value.
• Adjustment method ofVREM PWM Duty (H)
(mode number: 763)
1. Select the manual mode of the test mode, and set the mode
number 763. (See page 11)
2. Connect a digital voltmeter to the TP914 (VR) on the MAIN
board, and adjust [EASY SEARCH +] key (voltage up) or
[EASY SEARCH --] key (voltage down) so that the voltage
becomes 2.75 ±0.02 V.
Proceed to the next step without pressing Xkey if voltage is
already adjusted.
VclPWM
762
LCD display
VrhVcl
763
LCD display
C514
R518
R520
C526
R517
C
610
C611
C508
C511
C516
C517
C501
C502
C503
C
504
R507
R505
R609 R608
L
Q
5
TP915
(VC)
TP5105
(GND)
digital
voltmeter
TP915 (VC)
TP5105
(GND)
MAIN BOARD (SIDE B)
3. Press the Xkey to write the adjusted value.
•Adjustment method of VREM PWM Duty (L)
(mode number: 764)
1. Select the manual mode of the test mode, and set the mode
number 764. (See page 11)
2. Connect a digital voltmeter to the TP914 (VR) on the MAIN
board, and adjust [EASY SEARCH +] key (voltage up) or
[EASY SEARCH --] key (voltage down) so that the voltage
becomes 2.5 ±0.02 V.
Proceed to the next step without pressing Xkey if voltage is
already adjusted.
3. Press the Xkey to write the adjusted value.
VrlVcl
764
LCD display
C514
R518
R520
C526
R535
R537 R536
R517
6
29
R937 R924 R936 R923
C610
C09
C508
C511
C516
C517
C501
C502
C503
C504
R507
R505
L
TP914
(VR)
TP915
(VC)
TP5105
(GND)
digital
voltmeter
TP914 (VR)
TP5105
(GND)
MAIN BOARD (SIDE B)
C514
R518
R520
C526
R535
R537 R536
R517
6
29
R937 R924 R936 R923
C610
C09
C508
C511
C516
C517
C501
C502
C503
C504
R507
R505
L
TP914
(VR)
TP915
(VC)
TP5105
(GND)
digital
voltmeter
TP914 (VR)
TP5105
(GND)
MAIN BOARD (SIDE B)

–19 –
C514
R518
R520
C526
R517
C
610
C611
C508
C511
C516
C517
C501
C502
C503
C
504
R507
R505
R609 R608
L
Q
5
TP915
(VC)
TP5105
(GND)
digital
voltmeter
TP915 (VC)
TP5105
(GND)
MAIN BOARD (SIDE B)
VrlVch
767
LCD display
VrhVch
766
LCD display
C514
R518
R520
C526
R535
R537 R536
R517
6
29
R937 R924 R936 R923
C610
C09
C508
C511
C516
C517
C501
C502
C503
C504
R507
R505
L
TP914
(VR)
TP915
(VC)
TP5105
(GND)
digital
voltmeter
TP914 (VR)
TP5105
(GND)
MAIN BOARD (SIDE B)
•Adjustment method of VC PWM Duty (H)
(mode number: 765)
1. Select the manual mode of the test mode, and set the mode
number 765. (See page 11)
2. Connect a digital voltmeter to the TP915 (VC) on the MAIN
board, and adjust [EASY SEARCH +] key (voltage up) or
[EASY SEARCH --] key (voltage down) so that the voltage
becomes 2.75 ±0.02 V.
Proceed to the next step without pressing Xkey if voltage is
already adjusted.
3. Press the Xkey to write the adjusted value.
•Adjustment method of VREM PWM Duty (H)
(mode number: 766)
1. Select the manual mode of the test mode, and set the mode
number 766. (See page 11)
2. Connect a digital voltmeter to the TP914 (VR) on the MAIN
board, and adjust [EASY SEARCH +] key (voltage up) or
[EASY SEARCH --] key (voltage down) so that the voltage
becomes 2.75 ±0.02 V.
Proceed to the next step without pressing Xkey if voltage is
already adjusted.
C514
R518
R520
C526
R535
R537 R536
R517
6
29
R937 R924 R936 R923
C610
C09
C508
C511
C516
C517
C501
C502
C503
C504
R507
R505
L
TP914
(VR)
TP915
(VC)
TP5105
(GND)
digital
voltmeter
TP914 (VR)
TP5105
(GND)
MAIN BOARD (SIDE B)
VchPWM
765
LCD display
3. Press the Xkey to write the adjusted value.
•Adjustment method of VREM PWM Duty (L)
(mode number: 767)
1. Select the manual mode of the test mode, and set the mode
number 767. (See page 11)
2. Connect a digital voltmeter to the TP914 (VR) on the MAIN
board, and adjust [EASY SEARCH +] key (voltage up) or
[EASY SEARCH --] key (voltage down) so that the voltage
becomes 2.5 ±0.02 V.
Proceed to the next step without pressing Xkey if voltage is
already adjusted.
3. Press the Xkey to write the adjusted value.

–20 –
[Temperature Correction]
•Adjustment Method of temperature correction
1. Select the manual mode of test mode, and set the mode num-
ber 014. (See page 11)
2. Measure the ambient temperature.
3. Adjust with [EASY SEARCH +], [EASY SEARCH --] key so
that the adjusted value (hexadecimal value) becomes the am-
bient temperature.
(Initial value: 14h = 20 °C, Adjusting range: 80h to 7fh (–128
°C to +127 °C)
4. Press the Xkey to write the adjusted value.
[Overall Adjustment Mode]
•Adjustment Method of Overall Adjustment Mode
1. Setting the test mode. (See page 10)
2. Press the .or [EASY SEARCH --] key activates the over-
all adjustment mode where the LCD display as shown below.
3. Insert the CD test discTDYS-1 (Parts No.4-963-646-01) or an
available SONY CD disc.
4. Press Nkey. The system discriminates between CD and MO
and performs automatic adjustment for CD.
Also, if .key is pressed, CD is adjusted automatically.
: (DISC MARK) When power adjustment “H”finished;
Outward ON
When power adjustment “L”finished;
Inward ON
Power supply is not yet adjusted unless both outward
and inward disc marks are ON.
Note: Disc mark is displayed on the remote commander
LCD only.
** : Left side = MO auto adjustment information
F * : Auto adjustment finished
1 * : Manual adjustment remains
0
* : Not adjusted yet
Right side = CD auto adjustment information
* F: CD auto adjustment finished
* 1: Manual adjustment remains (not auto adjustment
)
* 0: Not adjusted yet
LCD display
ASSY**
000
SetTm
014
LCD display
•CD Automatic Adjustment item
Mode No. Description
312
313 CD electrical offset adjustment
314
328 CD TWPP gain adjustment
321 CD tracking error gain adjustment
323 CD tracking error offset adjustment
332
336 CD ABCD level adjustment
344 CD focus gain adjustment
345 CD tracking gain adjustment
521 CD two-axis sensibility adjustment
522
341 CD focus bias adjustment
5. If the result of automatic adjustment is OK, the following dis-
play appears in the LCD:
6. If the result of automatic adjustment is NG, the following dis-
play appears in the LCD:
7. If NG, set the manual mode. Perform automatic adjustment
for the items not accepted. (See page 11)
8. If CD adjustment is OK, insert an available SONY MO disc
(recorded).
At this time, be sure to turn OFF the disc protect switch.
9. Press Nkey. The system discriminates between CD and MO
and performs automatic adjustment for the MO disc.
Also, if >key is pressed, MO is adjusted automatically.
However, when CD adjustment is not finished, “SetCD!” is
blinking on the LCD and MO adjustment is not executed.
LCD display
CD OK
341
LCD display
### : Overall adjustment. NG mode number
### NG
LCD display
%%% : Manual mode number being executed
MO RUN
%%%
LCD display
CD RUN
%%%
%%% : Manual mode number being executed