Sony MDS-JB940 User manual

MDS-JB940
US Model
Canadian Model
AEP Model
UK Model
SERVICE MANUAL
MINIDISC DECK
Model Name Using Similar Mechanism NEW
MD Mechanism Type MDM-7A
Optical Pick-up Name KMS-260B/J1N
U.S and foreign patents licensed from Dolby
Laboratories Licensing Corporation.
SPECIFICATIONS
Inputs
Outputs
System MiniDisc digital audio system
Disc MiniDisc
Laser Semiconductor laser (λ= 780 nm)
Emission duration: continuous
Laser output MAX 44.6 µW1)
1) 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.
Laser diode Material: GaAlAs
Revolutions (CLV) 400 rpm to 900 rpm
Error correction ACIRC (Advanced Cross Interleave
Reed Solomon Code)
Sampling frequency 44.1 kHz
Coding ATRAC (Adaptive TRansform
Acoustic Coding)/ATRAC 3
Modulation system EFM (Eight-to-Fourteen
Modulation)
Number of channels 2 stereo channels
Frequency response 5 to 20,000 Hz ±0.3 dB
Signal-to-noise ratio Over 100 dB during play
Wow and flutter Below measurable limit
ANALOG IN Jack type: phono
Impedance: 47 kilohms
Rated input: 500 mVrms
Minimum input: 125 mVrms
DIGITAL OPTICAL IN1 Connector type: square optical
Impedance: 660 nm (optical wave
length)
DIGITAL OPTICAL IN2 Connector type: square optical
Impedance: 660 nm (optical wave
length)
DIGITAL COAXIAL IN Jack type: phono
Impedance: 75 ohms
Rated input: 0.5 Vp-p, ±20 %
PHONES Jack type: stereo phone
Rated output: 28 mW
Load impedance: 32 ohms
ANALOG OUT Jack type: phono
Rated output: 2 Vrms (at 50
kilohms)
Load impedance: over 10 kilohms
DIGITAL OPTICAL OUT Connector type: square optical
Rated output: –18 dBm
Load impedance: 660 nm (optical
wave length)
DIGITAL COAXIAL OUT Jack type: phono
Rated output: 0.5 Vp-p (at 75 ohms)
Load impedance: 75 ohms
General
Power requirements
Supplied accessories
US and foreign patents licensed from Dolby Laboratories.
Design and specifications are subject to change without
notice.
Where purchased Power requirements
U.S.A. and Canada 120 V AC, 60 Hz
Europe 230 V AC, 50/60 Hz
Power consumption 18 W
Dimensions (approx.) 430 ×111 ×286 mm (17 ×4 3/8×
11 3/8in.) (w/h/d) incl. projecting
parts and controls
Mass (approx.) 5.3 kg (11 lbs 11 oz)
This MD deck comes with the following items:
Audio connecting cords (2)
Optical cable (1)
Remote commander (remote) (1)
R6 (size-AA) batteries (2)

2
After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized”knobs,screws,
and all other exposed metal parts forAC leakage. Check leakage as
described below.
LEAKAGE
TheAC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operatedAC voltmeter. The “limit”indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2VAC range are suitable. (See
Fig. A)
SAFETY CHECK-OUT
To Exposed Metal
Parts on Set
0.15 µF1.5 kΩAC
Voltmeter
(0.75V)
Earth Ground
Fig.A. Using an AC voltmeter to check AC leakage.
TABLE OF CONTENTS
MODEL IDENTIFICATION
— BACK PANEL —
Model
AEP, UK models
Canadian model
US model
Part No.
4-228-507-0s
4-228-507-1s
4-228-507-2s
Part No.
SELF-DIAGNOSIS FUNCTION ········································ 4
1. SERVICE NOTE ······························································· 6
2. GENERAL ········································································ 11
3. DISASSEMBLY ······························································ 14
4. TEST MODE··································································· 17
5. ELECTRICAL ADJUSTMENTS······························ 22
6. DIAGRAMS
6-1. Block Diagram MAIN Section································ 31
6-2. Block Diagram DISPLAY/POWER Section ··········· 32
6-3. Note for Printed Wiring Boards and
Schematic Diagrams···················································· 33
6-4. Circuit Board Location ················································ 33
6-5. Waveforms··································································· 34
6-6. Printed Wiring Board BD Board ····························· 35
6-7. Schematic Diagram BD Board (1/2) ······················· 36
6-8. Schematic Diagram BD Board (2/2) ······················· 37
6-9. Printed Wiring Board HP Board/KEY Board·········· 38
6-10.Schematic Diagram HP Board/KEY Board ············ 38
6-11.Schematic Diagram MAIN Board (1/3) ·················· 39
6-12.Schematic Diagram MAIN Board (2/3) ·················· 40
6-13.Schematic Diagram MAIN Board (3/3) ·················· 41
6-14.Printed Wiring Board MAIN Board (Side A) ·········· 42
6-15.Printed Wiring Board MAIN Board (Side B)·········· 43
6-16.Printed Wiring Board PANEL Section ···················· 44
6-17.Schematic Diagram PANEL Section ······················· 45
6-18.Schematic Diagram AC Board ································ 46
6-19.Printed Wiring Board AC Board······························ 47
6-20.IC Block Diagrams ······················································ 48
6-21.IC Pin Function Description········································ 53
7. EXPLODED VIEWS ······················································ 60
8. ELECTRICAL PARTS LIST ······································· 64

3
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINEWITH
MARK 0ON 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
PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE 0SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
The following caution label is located inside the unit.
Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.
CAUTION
Use of controls or adjustments or performance of procedures
otherthan those specifiedherein may resultin hazardous radiation
exposure.
Notes on chip component replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be
damaged 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.
ADVARSEL
Eksplosjonsfare ved feilaktig skifte av batteri.
Benytt samme batteritype eller en tilsvarende type
anbefalt av apparatfabrikanten.
Brukte batterier kasseres i henhold til fabrikantens
instruksjoner.
VARNING
Explosionsfara vid felaktigt batteribyte.
Använd samma batterityp eller en likvärdig typ som
rekommenderas av apparattillverkaren.
Kassera använt batteri enligt gällande föreskrifter.
VAROITUS
Paristo voi räjähtää, jos se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin.
Hävitäkäytetty paristo valmistajan ohjeiden mukaisesti.
ADVARSEL!
Lithiumbatteri-Eksplosionsfare ved fejlagtig håndtering.
Udskiftning måkun ske med batteri
af samme fabrikat og type.
Levér det brugte batteri tilbage til leverandøren.
CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by
the manufacturer.
Discard used batteries according to the manufacturer’s instructions.
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,
observe from more than 30 cm away from the objective lens.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT

4
SELF-DIAGNOSIS FUNCTION
The self-diagnosis function consists of error codes for customers which are displayed automatically when errors occur,and error codes which
show the error history in the test mode during servicing. For details on how to view error codes for the customer, refer to the following box
in the instruction manual. For details on how to check error codes during servicing, refer to the following “Procedure for using the Self-
Diagnosis Function (Error History Display Mode)”.
The deck’s self-diagnosis function automatically checks the condition of the MD deck when an error occurs, then issues a three- or five-digit
code and an error message on the display. If the code and message alternate, find them in the following table and perform the indicated
countermeasure. Should the problem persist, consult your nearest Sony dealer.
PROCEDURE FOR USINGTHE SELF-DIAGNOSIS FUNCTION (ERROR HISTORY DISPLAY MODE)
Note: Perform the self-diagnosis function in the “error history display mode”in the test mode. The following describes the least required procedure. Be
careful not to enter other modes by mistake. If you set other modes accidentally, press the MENU/NO button to exit the mode.
1. While pressing the lAMS Lknob and xbutton, connect the power plug to the outlet, and release the lAMS Lknob and
xbutton. When the test mode is set “[Check]”is displayed.
2. Turn the lAMS Lknob and when “[Service]”is displayed, press the YES button.
3. Turn the lAMS Lknob to display “Err Display”.
4. Press the YES button to sets the error history mode and displays “op rec tm”.
5. Select the contents to be displayed or executed using the lAMS Lknob.
6. Press the lAMS Lknob to display or execute the contents selected.
7. Press the lAMS Lknob another time to return to step 4.
8. Press the MENU/NO button to display “Err Display”and release the error history mode.
9. To release the test mode, press the REPEAT button. The unit sets into the STANDBY state and the test mode ends.
Three- or five-
digit code/
Message Cause/Remedy
C11/Protected The inserted MD is record-protected.
Take out the MD and close the record-
protect slot (page 15).
C12/Cannot Copy
You tried to record a CD with a format
that the external device connected to the
deck does not support, such as CD-ROM
or video CD.
Remove the disc and insert a music
CD.
C13/REC Error
The recording was not made properly.
Set the deck in a stable surface, and
repeat the recording procedure.
The inserted MD is dirty (with smudges,
fingerprints, etc.), scratched, or
substandard in quality.
Replace the disc and repeat the
recording procedure.
C13/Read Error The deck could not read the TOC on the
MD properly.
Take out the MD and insert it again.
C14/Toc Error
The deck could not read the TOC on the
MD properly.
Insert another disc.
If possible, erase all the tracks on the
MD (page 32).
C41/Cannot Copy
The sound source is a copy of
commercially available music software, or
you tried to record a CD-R (Recordable
CD).
The Serial Copy Management System
prevents making a digital copy
(page 52). You cannot record a CD-R.
C71/Din Unlock
The sporadic appearance of this message
is caused by the digital signal being
recorded. This will not affect the
recording.
While recording from a digital component
connected through the DIGITAL IN
connector, the digital connecting cable
was unplugged or the digital component
turned off.
Connect the cable or turn the digital
component back on.
E0001/
MEMORY NG
There is an error in the internal data that
the deck needs in order to operate.
Consult your nearest Sony dealer.
E0101/
LASER NG
There is a problem with the optical
pickup.
The optical pickup may have failed.
Consult your nearest Sony dealer.
Three- or five-
digit code/
Message Cause/Remedy

5
[ITEMS OF ERROR HISTORY MODE ITEMS AND CONTENTS]
Details of History
Displays the total recording time.
When the total recording time is one minute or longer, displays the time and minute.
When the total recording time is less than one minute, displays “Under 1 min”.
The displayed time is about 1/4 of the actual recording time when the laser is set to the high power state.
Displays the total playback time.
When the total playback time is one minute or longer, displays the time and minute.
When the total playback time is less than one minute, displays “Under 1 min”.
Displays the total time when the spindle motor rotates.
When the total rotation time is one minute or longer, displays the time and minute.
When the total rotation time is less than one minute, displays “Under 1 min”.
Displays the total number of retries during recording and number of retry errors during playback.
Displayed as “r xx p yy”. “xx”indicates the number of retries during recording, “yy”indicates the number of retry
errors during playback.
The numbers are displayed in hexadecimal from 00 to FF.
Displays the total number of errors.
Displayed as “total xx”. The number is displayed in hexadecimal from 00 to FF.
Displays the last ten errors.
Displayed as “0x ErrCd@@”.
“x”indicates the history number. A smaller number indicates a more recent error (00 is the latest). @@ indicates the
error code. The error history number is selected by turning the lAMS Lknob.
Displays the last five retry addresses.
Displayed as “xx ADRS yyyy”. “xx”indicates the history number. “yyyy”indicates the cluster where the retry
occurred. The history number is selected by turning the lAMS Lknob.
Mode which erases the error history and the retry address history
[Operation procedure]
1When “er refresh”is displayed, press the lAMS Lknob.
2After the display changes to “er refresh?”, press the YES button.
The “Complete!”message indicates that the operation has ended.
After executing this mode, be sure to check the following:
•The data has been erased.
•The mechanism runs normally when recording and playback are performed.
Mode which erases the total time of “op rec tm”and “op play tm”
These histories are used as a guideline for the time to replace the optical pick-up. After replacing the optical pick-up,
perform this operation to erase the history.
[Operation procedure]
1When “op change”is displayed, press the lAMS Lknob.
2After the display changes to “op change?”, press the YES button.
The “Complete!”message indicates that the operation has ended.
Mode which erases the total time of “spdl rp tm”
The history is used as a guideline for the time to replace the spindle motor. After replacing the spindle motor, perform
this operation to erase the history.
[Operation procedure]
1When “spdl change”is displayed, press the lAMS Lknob.
2After the display changes to “spdl change?”, press the YES button.
The “Complete!”message indicates that the operation has ended.
Table of Error Codes
Display
op rec tm
op play tm
spdl rp tm
retry err
total err
err history
retry adrs
er refresh
op change
spdl change
Error Code
10
12
20
21
22
23
24
30
Details of Error
Loading error
The combination of loading switches is not acceptable.
Time out. The beginning of PTOC cannot be read.
Contents error. The beginning of PTOC can be read.
Time out. Access to UTOC failed.
Time out. UTOC cannot be read.
Contents error of UTOC
Playback start error
Error Code
31
40
41
42
43
50
51
Details of Error
There is an abnormality in the sector contents.
An error caused a retry during continuous recording.
Retry was executed due to DRAM overflow.
Retry was executed during TOC writing.
S.F Edit was aborted due to retry.
Address cannot be read although access processing is
not in progress.
Runaway due to focus NG

6
JIG FOR CHECKING BD BOARD WAVEFORM
The special jig (J-2501-196-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be
performed are shown as follows.
GND : Ground
I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser)
IOP : For measuring IOP (Check the deterioration of the optical pick-up laser)
TEO : TRK error signal (Traverse adjustment)
VC : Reference level for checking the signal
RF : RF signal (Check jitter)
FE : FOCUS error
SECTION 1
SERVICE NOTE
CN105
RF
VC
TE
IOP
I+3V
GND
Mechanism deck
RF
VC
for
MDM-
7
IOP
TE
I+3V
GND
VC
RF
TE
IOP
I+3V
GND
1
7
FE
FE FE

7
IOP DATA RECORDING AND DISPLAY WHEN OPTICAL PICK-UP AND
NON-VOLATILE MEMORY (IC195 OF BD BOARD) ARE REPLACED
The IOP value labeled on the optical pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need
to look at the value on the optical pick-up label. When replacing the optical pick-up or non-volatile memory (IC195 of BD board), record the
IOP value on the optical pick-up according to the following procedure.
Record Procedure:
1. While pressing the lAMS Lknob and xbutton, connect the power plug to the outlet, and release the lAMS Lknob
and xbutton.
2. Turn the lAMS Lknob to display “[Service]”, and press the YES button.
3. Turn the lAMS Lknob to display “lop Write”(C28), and press the YES button.
4. The display becomes “Ref=@@@.@”(@ is an arbitrary number) and the numbers which can be changed will blink.
5. Input the IOP value written on the optical pick-up label.
To select the number : Turn the lAMS Lknob.
To select the digit : Press the lAMS Lknob.
6. When the YES button is pressed, the display becomes “Measu=@@@.@”(@ is an arbitrary number).
7. As the adjustment results are recorded for the 6 value. Leave it as it is and press the YES button.
8. “Complete!”will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop
Write”.
9. Press the FILTER button to complete.
Display Procedure:
1. While pressing the lAMS Lknob and xbutton, connect the power plug to the outlet, and release the lAMS Lknob
and xbutton.
2. Turn the lAMS Lknob to display “[Service]”, and press the YES button.
3. Turn the lAMS Lknob to display “lop Read”(C27).
4. “@@.@/##.#”is displayed and the recorded contents are displayed.
@@.@ : indicates the IOP value on the optical pick-up label.
##.# : indicates the IOP value after adjustment
5. To end, press the lAMS Lknob or MENU/NO button to display “Iop Read”. Then press the FILTER button.

8
CHECKS PRIORTO PARTS REPLACEMENT AND ADJUSTMENTS
Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent.
Details of the procedures are described in “5. Electrical Adjustments”.
Laser power check
(See page 25)
Temp check
(See page 25)
Measure if unsatisfactory:
•Clean the optical pick-up
•Adjust again
•Replace the optical pick-up
•Replace the optical pick-up
•Check for disconnection of the circuits around
D101 (BD board)
•Check the signals around IC101, IC151, CN102,
CN103 (BD board)
Note: The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for adjustments.
When performing adjustments, use the specified values for adjustments.
Criteria for Determination
(Unsatisfactory if specified value is not satisfied)
•0.9 mW power
Specified value : 0.84 to 0.92 mW
•7.0 mW power
Specified value : 6.8 to 7.2 mW
lop (at 7mW)
•Labeled on the optical pickup
Iop value ± 10mA
•Unsatisfactory if displayed as T=@@ (##) [NG”
NG
(@@, ## are both arbitrary numbers)

9
RETRY CAUSE DISPLAY MODE
•In this test mode, the causes for retry of the unit during recording can be displayed on the fluorescent indicator tube. During playback, the
“track mode”for obtaining track information will be set.
This is useful for locating the faulty part of the unit.
•The following will be displayed :
During recording and stop : Retry cause, number of retries, and number of retry errors.
During playback : Information such as type of disc played, part played, copyright.
These are displayed in hexadecimal.
Procedure:
1. Procedure 1: Press the xbutton continuously for about 10 seconds.
Procedure 2: Press the LEVEL/DISPLAY/CHAR button while pressing the xbutton and MENU/NO button.
2. When the mode is set, “RTs 00c 00e 000”is displayed.
3. Press the zREC button to start recording. Then press the Xbutton and start recording.
4. To check the “track mode”, press the Hbutton to start play.
5. To exit the test mode, press the ?/1 button, and turn OFF the power. When “TOC”disappears, disconnect the power plug from the
outlet.
Fig. 1 Reading theTest Mode Display
(During recording and stop)
RTs@@c##e**
Fluorescent indicator tube display
@@ : Cause of retry
## : Number of retries
** : Number of retry errors
Fig. 2 Reading theTest Mode Display
(During playback)
@@ ###** $$
Fluorescent indicator tube display
@@ : Parts No. (name of area named on TOC)
## : Cluster
** : Sector
$$ : Track mode (Track information such as
copyright information of each part)
Higher Bits Lower Bits
84218421
b7 b6 b5 b4 b3 b2 b1 b0
00000001
00000010
00000100
00001000
00010000
00100000
01000000
10000000
Hexadecimal
Bit
Binary
Reading the Display:
Convert the hexadecimal display into binary display. If more than two causes, they will be added.
Example
When 42 is displayed:
Higher bit : 4 = 0100 tb6
Lower bit : 2 = 0010 tb1
In this case, the retry cause is combined of “CLV unlock”and “ader5”.
When A2 is displayed:
Higher bit : A = 1010 tb7+b5
Lower bit : 2 = 0010 tb1
The retry cause in this case is combined of “access fault”, “IVR rec error”, and “ader5”.


Address
Hexa-
decimal
01
02
04
08
10
20
40
80
Cause of
Retry
shock
ader5
Discontinuous address
DIN unlock
FCS incorrect
IVR rec error
CLV unlock
Access fault
Occurring conditions
When track jump (shock) is detected
When ADER was counted more than five times
continuously
When ADIP address is not continuous
When DIN unlock is detected
When not in focus
When ABCD signal level exceeds the specified range
When CLV is unlocked
When access operation is not performed normally
Reading the Retry Cause Display

10
Reading the Retry Cause Display
Reading the Display:
Convert the hexadecimal display into binary display. If more than two causes, they will be added.
Example When 84 is displayed:
Higher bit : 8 = 1000 tb7
Lower bit : 4 = 0100 tb2
In this case, as b2 and b7 are 1 and others are 0, it can be determined that the retry cause is combined of “emphasis OFF”, “monaural”,
“original”, “copyright exists”, and “write allowed”.
Example When 07 is displayed:
Higher bit : 0 = 1000 tAll 0
Lower bit : 7 = 0111 tb0+b1+b2
In this case, as b0, b1, and b2 are 1 and others are 0, it can be determined that the retry cause is combined of “emphasis ON”, “stereo”,
“original”, “copyright exists”, and “write prohibited”.
Hexadecimal t Binary ConversionTable
Hexadecimal Binary Hexadecimal Binary
0 0000 8 1000
1 0001 9 1001
2 0010 A 1010
3 0011 B 1011
4 0100 C 1100
5 0101 D 1101
6 0110 E 1110
7 0111 F 1111
Higher Bits Lower Bits
84218421
b7 b6 b5 b4 b3 b2 b1 b0
00000001
00000010
00000100
00001000
00010000
00100000
01000000
10000000
Hexadecimal
Bit
Binary
Hexa-
decimal
01
02
04
08
10
20
40
80
Details
When 0
Emphasis OFF
Monaural
This is 2-bit display. Normally 01.
01:Normal audio. Others:Invalid
Audio (Normal)
Original
Copyright
Write prohibited
When 1
Emphasis ON
Stereo
Invalid
Digital copy
No copyright
Write allowed

11
SECTION 2
GENERAL This section is extracted
from instruction manual.

12

13

14
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. CASE (4095269)
1Four screws (Screw (TP), flat head)
3Case (4095269)
2Three screws
(Screw (TP), flat head)
3-2. FRONT PANEL SECTION
Claw
4Six screws
(BVTP3 ×8)
Claw
5Front panel section
1Connector
(CN800)
2Connector
(CN801)
3Wire (flat type)(19 core)(CN2)

15
3-3. AU BOARD
7Wire (flat type) (27 core)
(CN12)
1Wire (flat type) (19 core)
(CN2)
8Wire (flat type) (23 core)
(CN11)
qs AU board
6Connector
(CN700)
q; Four screws
(BVTP 3 ×8)
9Screw
(BVTP 3 ×8)
5Connector
(CN401)
4Connector
(CN403) 3Connector
(CN404)
2Connector
(CN200)
qa Seven screws
(BVTP 3 ×8)

16
3-4. MECHANISM DECK (MDM-7A)
3Four step screws
(BVTTWH M3)
4Remove the mechanism deck
(MDM-7A) to direction of the arrow.
2Wire (flat type)(23 core)(CN11)
1Wire (flat type) (27 core
)
(CN12)
3-5. BD BOARD
5Remove the solder (four portions)
4Remove the solder (five portions)
6Two screws (BTP 2 ×6)
8Flexible board (CN104)
3Connector
(CN104)
7BD board
1Wire (flat type)(23 core)
2Wire (flat type
)
(27 core)

17
SECTION 4
TEST MODE
4-1. PRECAUTIONS FOR USE OFTEST MODE
• 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 EJECT Abutton 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 EJECT Abutton after pressing the MENU/NO button and the rotation of disc is stopped.
4-1-1. Recording laser emission mode
• Continuous recording mode (CREC 1 MODE)
• Laser power check mode (LDPWR CHECK)
• Laser power adjustment mode (LDPWR ADJUS)
• IOP check (Iop compare)
• IOP value non-volatile writing (Iop NV Save)
• Traverse (MO) check (EF MO CHECK)
• Traverse (MO) adjustment (EF MO ADJUS)
• When pressing the REC zbutton.
4-2. SETTINGTHETEST MODE
The following are two methods of entering the test mode.
Procedure 1: While pressing the lAMS Lknob and xbutton, connect the power plug to an outlet, and release the lAMS L
knob and xbutton.
When the test mode is set, “[Check]” will be displayed. Turn the lAMS Lknob switches between the following three
groups; ···y[Check] y[Service] y[Develop] y···.
Procedure 2: While pressing the lAMS Lknob, connect the power plug to the outlet and release the lAMS Lknob.
When the test mode is set, “TEMP CHECK” will be displayed. By setting the test mode using this method, only the “Check”
group of method 1 can be executed.
4-3. RELEASINGTHETEST MODE
Press the REPEAT button. The test mode is released and the unit sets into the STANDBY state.
4-4. BASIC OPERATIONS OFTHETEST MODE
All operations are performed using the lAMS Lknob, YES button, and MENU/NO button.
The functions of these buttons are as follows.
Function name
MENU/NO button
YES button
lAMS Lknob (right and left)
lAMS Lknob (push)
Function
Cancels or moves to the next level up in the hierarchy.
Establishes.
Selects.
Establishes the sub menu.

18
4-5. SELECTINGTHETEST MODE
There are 25 types of test mode as shown below. The groups can be switched by turning the lAMS Lknob.
All of the service adjustments and checks can be performed in the test modes of Service group.
There is also the Develop group, but it is not used for service. If the Develop group is set by mistake, immediately press the MENU/NO
button to release the group.
• For details of each adjustment mode, refer to “5. Electrical Adjustments” on page 22.
• For details of “Err Display” (C02), refer to “Self-Diagnosis Function” on page 4.
• If a different mode has been selected by mistake, press the MENU/NO button to release that mode.
• Modes with (×) in the Mark column are not used for servicing and therefore are not described in detail. If these modes are set accidentally,
press the MENU/NO button to release the mode immediately. Be especially careful not to use a test mode of Develop the unit will not
operate normally.
Display
AUTO CHECK
Err Display
TEMP ADJUS
LDPWR ADJUS
Iop Write
Iop NV Save
EF MO ADJUS
EF CD ADJUS
FBIAS ADJUS
AG Set (MO)
AG Set (CD)
TEMP CHECK
LDPWR CHECK
EF MO CHECK
EF CD CHECK
FBIAS CHECK
ScurveCHECK
VERIFYMODE
DETRK CHECK
0920 CHECK
Iop Read
Iop Compare
ADJ CLEAR
INFORMATION
CPLAY 1 MODE
CREC 1 MODE
No.
C01
C02
C03
C04
C05
C06
C07
C08
C09
C10
C11
C12
C13
C14
C15
C16
C17
C18
C19
C25
C26
C27
C28
C31
C34
C35
Contents
Auto self-diagnosis
Error history display/delete
Temperature compensation offset adjustment
Laser power adjustment
IOP data writing
The current IOP value is read by the microprocessor and written into non-
volatile memory.
Traverse (MO) check
Traverse (CD) check
Focus bias adjustment
Focus tracking gain adjustment (MO)
Focus tracking gain adjustment (CD)
Temperature compensation offset check
Laser power check
Traverse (MO) check
Traverse (CD) check
Focus bias check
S-curve check
Non-volatile memory check
Detrack check
Outermost circumference check
IOP data display
Comparison with initial IOP value written in non-volatile memory
Initialization of adjustment value in non-volatile memory
Display of version of microprocessor, etc.
Continuous playback mode
Continuous recording mode
Service
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
Check
a
a
a
a
a
a
a
a
a
a
a
a
a
a
GroupMark
×
×
×
×

19
4-5-1. Operating the Continuous Playback Mode
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 lAMS Lknob and display “CPLAY 1 MODE” (C35).
3) Press the YES button to change the display to “CPLAY 1 MID”.
4) When access completes, the display changes to “C = AD = ”.
Note: The numbers “ ” displayed show you error rates and “ADER”.
2. Changing the parts to be played back
1) Press the YES button during continuous playback to change the display as below. The parts to be played back can be moved.
2) When access completes, the display changes to “C = AD = ”.
Note: The numbers “ ” displayed show you error rates and “ADER”.
3. Ending the continuous playback mode
1) Press the MENU/NO button. The display will change to “CPLAY 1 MODE”.
2) Press the EJECT Abutton and take out the disc.
Note: The playback start addresses for IN, MID, and OUT are as follows.
IN 40h cluster
MID 300h cluster
OUT 700h cluster
4-5-2. Operating the Continuous Recording Mode (Use only when performing self-recording/palyback check.)
1. Entering the continuous recording mode
1) Set a recordable disc in the unit.
2) Turn the lAMS Lknob and display “CREC 1 MODE” (C34).
3) Press the YES button to change the display to “CREC 1 MID”.
4) When access completes, the display changes to “CREC 1 ( ” and “ REC ” lights up.
Note: The numbers “ ” displayed shows you the recording position addresses.
2. Changing the parts to be recorded
1) When the YES button is pressed during continuous recording, the display changes as below. The parts to be recorded can be changed.
“ REC ” goes off during movement.
2) When access completes, the display changes to “CREC 1 ( ” and “ REC ” lights up.
Note: The numbers “ ” displayed shows you the recording position addresses.
3. Ending the continuous recording mode
1) Press the MENU/NO button. The display changes to “CREC 1 MODE” and “ REC ” goes off.
2) Press the lAMS Lbutton and take out the disc.
Note 1: The recording start addresses for IN, MID, and OUT are as follows.
IN 40h cluster
MID 300h cluster
OUT 700h cluster
Note 2: The MENU/NO button can be used to stop recording anytime.
Note 3: Do not perform continuous recording for long periods of time above 5 minutes.
Note 4: During continuous recording, be careful not to apply vibration.
“CPLAY 1 MID” t“CPLAY 1 OUT” t“CPLAY 1 IN”
“CPLAY 1 MID” t“CPLAY 1 OUT” t“CREC 1 IN”

20
4-6. FUNCTIONS OF OTHER BUTTONS
4-7. TEST MODE DISPLAYS
The DISPLAY/CHAR button is used to change the display mode. Each time the DISPLAY/CHAR button is pressed, the display changes
in the following order.
When C-PLAY or C-REC starts, the display is forcibly switched to one of “2” as the initial mode.
Supplementary explanations of each display
1. Mode display
A display such as “TEMP ADJUST” or “CPLAY 1 MODE” appears.
2. Error rate display
The error rate is displayed as shown below.
C=xxxxAD=xx
C= indicates C1 error,AD= indicates ADER.
3. Address display
The address is displayed as shown below.
h=xxxx s=xxxx (pit of recordable disc and playback-only disc)
h=xxxx a=xxxx (groove of recordable disc)
h= indicates header address, s= indicates SUBQ address, a= indicates ADIP address.
* If the address cannot be read, “-” appears.
Displays other than the above are not used for service.
Contents
Sets continuous playback when pressed in the STOP state. When pressed during continuous playback, the
tracking servo turns ON/OFF.
Stops continuous playback and continuous recording.
The sled moves to the outer circumference only when this is pressed.
The sled moves to the inner circumference only when this is pressed.
Switches between the pit and groove modes when pressed.
Switches the spindle servo mode (CLV-S yCLV-A).
Switches the displayed contents each time the button is pressed
Ejects the disc
Releases the test mode
Function
PLAY
STOP
FF
FR
REC MODE
(other models/SF EDIT/SCROLL)
PLAY MODE
DISPLAY
EJECT
POWER/REPEAT
Order
1
2
3
4
5
6
7
8
Details
Mode display
Error rate display
Address display
Auto gain display
Detrack display
IVR display
Display of C1 error and jitter
Display of AD error and jitter
Display
CPLAY (xxxx
C=xxxxAD=xx
hxxxx sxxxx
AG=xx/xx[xx]
ADR=xx#0000
[xx][xx][xx]
Jxxxx Cxxxx
Jxxxx AD=xx