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MDS-JB940
SERVICE MANUAL
US Model Canadian Model AEP Model UK Model

U.S and foreign patents licensed from Dolby Laboratories Licensing Corporation.

Model Name Using Similar Mechanism MD Mechanism Type Optical Pick-up Name

NEW MDM-7A KMS-260B/J1N

SPECIFICATIONS
System Disc Laser Laser output MiniDisc digital audio system MiniDisc Semiconductor laser ( = 780 nm) Emission duration: continuous MAX 44.6 хW1) 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. Material: GaAlAs 400 rpm to 900 rpm ACIRC (Advanced Cross Interleave Reed Solomon Code) 44.1 kHz ATRAC (Adaptive TRansform Acoustic Coding)/ATRAC 3 EFM (Eight-to-Fourteen Modulation) 2 stereo channels 5 to 20,000 Hz ▒0.3 dB Over 100 dB during play Below measurable limit 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 % Outputs PHONES Jack type: stereo phone Rated output: 28 mW Load impedance: 32 ohms Mass (approx.) General Power requirements Where purchased U.S.A. and Canada Europe Power consumption Dimensions (approx.) Power requirements 120 V AC, 60 Hz 230 V AC, 50/60 Hz 18 W 430 О 111 О 286 mm (17 О 4 3/8 О 11 3/8 in.) (w/h/d) incl. projecting parts and controls 5.3 kg (11 lbs 11 oz)

Laser diode Revolutions (CLV) Error correction Sampling frequency Coding Modulation system Number of channels Frequency response Signal-to-noise ratio Wow and flutter Inputs ANALOG IN

Supplied accessories

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: Г18 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

This MD deck comes with the following items: Audio connecting cords (2) Optical cable (1) Remote commander (remote) (1) R6 (size-AA) batteries (2) US and foreign patents licensed from Dolby Laboratories. Design and specifications are subject to change without notice.

MINIDISC DECK

TABLE OF CONTENTS SELF-DIAGNOSIS FUNCTION ииииииииииииииииииииииииииииииииииииииии 4 1. SERVICE NOTE иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии 6 2. GENERAL ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии 11 3. DISASSEMBLY ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии 14 4. TEST MODE иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии 17 5. ELECTRICAL ADJUSTMENTS ииииииииииииииииииииииииииииии 22 6. DIAGRAMS
6-1. Block Diagram MAIN Section ииииииииииииииииииииииииииииииии 31 6-2. Block Diagram DISPLAY/POWER Section иииииииииии 32 6-3. Note for Printed Wiring Boards and Schematic Diagrams ииииииииииииииииииииииииииииииииииииииииииииииииииии 33 6-4. Circuit Board Location ииииииииииииииииииииииииииииииииииииииииииииииии 33 6-5. Waveforms иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии 34 6-6. Printed Wiring Board BD Board иииииииииииииииииииииииииииии 35 6-7. Schematic Diagram BD Board (1/2) иииииииииииииииииииииии 36 6-8. Schematic Diagram BD Board (2/2) иииииииииииииииииииииии 37 6-9. Printed Wiring Board HP Board/KEY Board ииииииииии 38 6-10. Schematic Diagram HP Board/KEY Board ииииииииииии 38 6-11. Schematic Diagram MAIN Board (1/3) ииииииииииииииииии 39 6-12. Schematic Diagram MAIN Board (2/3) ииииииииииииииииии 40 6-13. Schematic Diagram MAIN Board (3/3) ииииииииииииииииии 41 6-14. Printed Wiring Board MAIN Board (Side A) ииииииииии 42 6-15. Printed Wiring Board MAIN Board (Side B) ииииииииии 43 6-16. Printed Wiring Board PANEL Section ииииииииииииииииииии 44 6-17. Schematic Diagram PANEL Section иииииииииииииииииииииии 45 6-18. Schematic Diagram AC Board ииииииииииииииииииииииииииииииии 46 6-19. Printed Wiring Board AC Board ииииииииииииииииииииииииииииии 47 6-20. IC Block Diagrams ииииииииииииииииииииииииииииииииииииииииииииииииииииии 48 6-21. IC Pin Function Description ииииииииииииииииииииииииииииииииииииииии 53

SAFETY CHECK-OUT
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 for AC leakage. Check leakage as described below.

LEAKAGE
The AC 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. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job. Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC 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 2V AC range are suitable. (See Fig. A)
To Exposed Metal Parts on Set

2.

3.

0.15 хF

1.5 k

AC Voltmeter (0.75 V)

7. EXPLODED VIEWS ииииииииииииииииииииииииииииииииииииииииииииииииииииии 60 8. ELECTRICAL PARTS LIST иииииииииииииииииииииииииииииииииииииии 64
Earth Ground Fig. A. Using an AC voltmeter to check AC leakage.

MODEL IDENTIFICATION
-- BACK PANEL --
Part No.

Model AEP, UK models Canadian model US model

Part No. 4-228-507-0s 4-228-507-1s 4-228-507-2s

2

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. ADVARSEL! Lithiumbatteri-Eksplosionsfare ved fejlagtig hтndtering. Udskiftning mт kun ske med batteri af samme fabrikat og type. Levжr det brugte batteri tilbage til leverandЭren.

Laser component in this product is capable of emitting radiation exceeding the limit for Class 1.

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. AnvСnd samma batterityp eller en likvСrdig typ som rekommenderas av apparattillverkaren. Kassera anvСnt batteri enligt gСllande fШreskrifter. VAROITUS Paristo voi rСjСhtСС, jos se on virheellisesti asennettu. Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin. HСvitС kСytetty paristo valmistajan ohjeiden mukaisesti.

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.

CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. Notes on chip component replacement и Never reuse a disconnected chip component. и Notice that the minus side of a tantalum capacitor may be damaged by heat. Flexible Circuit Board Repairing и Keep the temperature of soldering iron around 270░C during repairing. и Do not touch the soldering iron on the same conductor of the circuit board (within 3 times). и Be careful not to apply force on the conductor when soldering or unsoldering.

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 pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.

SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 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 PUBLISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT └ LA S╔CURIT╔! LES COMPOSANTS IDENTIF╔S PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCH╔MATIQUES ET LA LISTE DES PI╚CES SONT CRITIQUES POUR LA S╔CURIT╔ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PI╚SES SONY DONT LES NUM╔ROS SONT DONN╔S DANS CE MANUEL OU DANS LES SUPP╔MENTS PUBLI╔S PAR SONY.

3

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 SelfDiagnosis 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.

Three- or fivedigit code/ Message C11/Protected

Cause/Remedy The inserted MD is record-protected. Take out the MD and close the recordprotect slot (page 15). 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. 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. The deck could not read the TOC on the MD properly. Take out the MD and insert it again. 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). 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.

Three- or fivedigit code/ Message

Cause/Remedy The sporadic appearance of this message is caused by the digital signal being recorded. This will not affect the recording.

C12/Cannot Copy

C71/Din Unlock

C13/REC Error

E0001/ MEMORY NG

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. There is an error in the internal data that the deck needs in order to operate. Consult your nearest Sony dealer. There is a problem with the optical pickup. The optical pickup may have failed. Consult your nearest Sony dealer.

E0101/ LASER NG

C13/Read Error

C14/Toc Error

C41/Cannot Copy

PROCEDURE FOR USING THE 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 l AMS L knob and x button, connect the power plug to the outlet, and release the l AMS L knob and x button. When the test mode is set "[Check]" is displayed. 2. Turn the l AMS L knob and when "[Service]" is displayed, press the YES button. 3. Turn the l AMS L knob 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 l AMS L knob. 6. Press the l AMS L knob to display or execute the contents selected. 7. Press the l AMS L knob 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.

4

[ITEMS OF ERROR HISTORY MODE ITEMS AND CONTENTS]
Display op rec tm 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 [email protected]@". "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 l AMS L knob. 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 l AMS L knob. Mode which erases the error history and the retry address history [Operation procedure] 1 When "er refresh" is displayed, press the l AMS L knob. 2 After 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: и The data has been erased. и 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] 1 When "op change" is displayed, press the l AMS L knob. 2 After 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] 1 When "spdl change" is displayed, press the l AMS L knob. 2 After the display changes to "spdl change?", press the YES button. The "Complete!" message indicates that the operation has ended.

op play tm

spdl rp tm

retry err

total err err history

retry adrs

er refresh

op change

spdl change

Table of Error Codes Error Code Details of Error Error Code 10 Loading error 31 12 The combination of loading switches is not acceptable. 40 20 Time out. The beginning of PTOC cannot be read. 41 21 Contents error. The beginning of PTOC can be read. 42 22 Time out. Access to UTOC failed. 43 23 Time out. UTOC cannot be read. 50 24 Contents error of UTOC 30 Playback start error 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

5

SECTION 1 SERVICE NOTE
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

Mechanism deck

CN105

IOP

TE

VC I+3V GND FE RF 1 I+3V IOP GND TE FE VC RF 7

I+3V IOP GND TE FE VC RF

for MDM-7

6

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 l AMS L knob and x button, connect the power plug to the outlet, and release the l AMS L knob and x button. 2. Turn the l AMS L knob to display "[Service]", and press the YES button. 3. Turn the l AMS L knob to display "lop Write" (C28), and press the YES button. 4. The display becomes "[email protected]@@[email protected]" (@ 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 l AMS L knob. To select the digit : Press the l AMS L knob. 6. When the YES button is pressed, the display becomes "[email protected]@@[email protected]" (@ 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 l AMS L knob and x button, connect the power plug to the outlet, and release the l AMS L knob and x button. 2. Turn the l AMS L knob to display "[Service]", and press the YES button. 3. Turn the l AMS L knob to display "lop Read" (C27). 4. "@@[email protected]/##.#" is displayed and the recorded contents are displayed. @@[email protected] : indicates the IOP value on the optical pick-up label. ##.# : indicates the IOP value after adjustment 5. To end, press the l AMS L knob or MENU/NO button to display "Iop Read". Then press the FILTER button.

7

CHECKS PRIOR TO 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". Criteria for Determination (Unsatisfactory if specified value is not satisfied) и 0.9 mW power Specified value : 0.84 to 0.92 mW и 7.0 mW power Specified value : 6.8 to 7.2 mW lop (at 7mW) и Labeled on the optical pickup Iop value ▒ 10mA и Unsatisfactory if displayed as [email protected]@ (##) [NG" NG (@@, ## are both arbitrary numbers) Measure if unsatisfactory: и Clean the optical pick-up и Adjust again и Replace the optical pick-up и Replace the optical pick-up

Laser power check (See page 25)

Temp check (See page 25)

и Check for disconnection of the circuits around D101 (BD board) и 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.

8

RETRY CAUSE DISPLAY MODE
и 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. и 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 x button continuously for about 10 seconds. Procedure 2: Press the LEVEL/DISPLAY/CHAR button while pressing the x button and MENU/NO button. 2. When the mode is set, "RTs 00c 00e 000" is displayed. 3. Press the z REC button to start recording. Then press the X button and start recording. 4. To check the "track mode", press the H button 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 the Test Mode Display (During recording and stop)
[email protected]@c##e** Fluorescent indicator tube display @@ : Cause of retry ## : Number of retries ** : Number of retry errors

Fig. 2 Reading the Test Mode Display (During playback)
@@ ###** $$ Fluorescent indicator tube display @@ : ## : ** : $$ : Parts No. (name of area named on TOC) Cluster Sector Address Track mode (Track information such as copyright information of each part)

Reading the Retry Cause Display Higher Bits Lower Bits HexaCause of Hexadecimal 8 4 2 1 8 4 2 1 decimal Retry Bit b7 b6 b5 b4 b3 b2 b1 b0 Binary 0 0 0 0 0 0 0 1 01 shock 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 02 04 08 10 20 40 80

Occurring conditions

When track jump (shock) is detected When ADER was counted more than five times ader5 continuously Discontinuous address When ADIP address is not continuous DIN unlock When DIN unlock is detected FCS incorrect When not in focus IVR rec error When ABCD signal level exceeds the specified range CLV unlock When CLV is unlocked Access fault When access operation is not performed normally

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 t b6 Lower bit : 2 = 0010 t b1 In this case, the retry cause is combined of "CLV unlock" and "ader5". When A2 is displayed: Higher bit : A = 1010 t b7+b5 Lower bit : 2 = 0010 t b1 The retry cause in this case is combined of "access fault", "IVR rec error", and "ader5".

9

Reading the Retry Cause Display Higher Bits Hexadecimal 8 4 2 1 Bit b7 b6 b5 b4 Binary 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 1 0 0 1 0 0 0 Lower Bits Details Hexa8 4 2 1 decimal When 0 When 1 b3 b2 b1 b0 0 0 0 1 01 Emphasis OFF Emphasis ON 0 0 1 0 02 Monaural Stereo 0 1 0 0 04 This is 2-bit display. Normally 01. 01:Normal audio. Others:Invalid 1 0 0 0 08 0 0 0 0 10 Audio (Normal) Invalid 0 0 0 0 20 Original Digital copy 0 0 0 0 40 Copyright No copyright 0 0 0 0 80 Write prohibited Write allowed

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 t b7 Lower bit : 4 = 0100 t b2 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 t All 0 Lower bit : 7 = 0111 t b0+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 Conversion Table
Hexadecimal 0 1 2 3 4 5 6 7 Binary 0000 0001 0010 0011 0100 0101 0110 0111 Hexadecimal 8 9 A B C D E F Binary 1000 1001 1010 1011 1100 1101 1110 1111

10

SECTION 2 GENERAL

This section is extracted from instruction manual.

11

12

13

SECTION 3 DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.

3-1. CASE (4095269)
1 Four screws (Screw (TP), flat head) 3 Case (4095269) 2 Three screws (Screw (TP), flat head)

3-2. FRONT PANEL SECTION
2 Connector (CN801) 1 Connector (CN800) Claw

3 Wire (flat type)(19 core)(CN2)

Claw

4 Six screws (BVTP3 О 8) 5 Front panel section

14

3-3. AU BOARD

5 Connector (CN401) 4 Connector (CN403) 3 Connector (CN404)

9 Screw (BVTP 3 О 8) 8 Wire (flat type) (23 core) (CN11) 6 Connector (CN700) 7 Wire (flat type) (27 core) (CN12)

2 Connector (CN200) q; Four screws (BVTP 3 О 8)

1 Wire (flat type) (19 core) (CN2)

qa Seven screws (BVTP 3 О 8)

qs AU board

15

3-4. MECHANISM DECK (MDM-7A)
2 Wire (flat type)(23 core)(CN11) 3 Four step screws (BVTTWH M3) 1 Wire (flat type) (27 core) (CN12) 4 Remove the mechanism deck (MDM-7A) to direction of the arrow.

3-5. BD BOARD

5 Remove the solder (four portions) 1 Wire (flat type)(23 core)

2 Wire (flat type) (27 core)

7 BD board 3 Connector (CN104)

4 Remove the solder (five portions) 6 Two screws (BTP 2 О 6)

8 Flexible board (CN104)

16

SECTION 4 TEST MODE
4-1. PRECAUTIONS FOR USE OF TEST MODE
и 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 A button is pressed while the disc is rotating during continuous playback, continuous recording, etc., the disc will not stop rotating. Therefore, it will be ejected while rotating. Be sure to press the EJECT A button after pressing the MENU/NO button and the rotation of disc is stopped. 4-1-1. Recording laser emission mode и Continuous recording mode (CREC 1 MODE) и Laser power check mode (LDPWR CHECK) и Laser power adjustment mode (LDPWR ADJUS) и IOP check (Iop compare) и IOP value non-volatile writing (Iop NV Save) и Traverse (MO) check (EF MO CHECK) и Traverse (MO) adjustment (EF MO ADJUS) и When pressing the REC z button.

4-2. SETTING THE TEST MODE
The following are two methods of entering the test mode. Procedure 1: While pressing the l AMS L knob and x button, connect the power plug to an outlet, and release the l AMS L knob and x button. When the test mode is set, "[Check]" will be displayed. Turn the l AMS L knob switches between the following three groups; иииy [Check] y [Service] y [Develop] y иии. Procedure 2: While pressing the l AMS L knob, connect the power plug to the outlet and release the l AMS L knob. 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. RELEASING THE TEST MODE
Press the REPEAT button. The test mode is released and the unit sets into the STANDBY state.

4-4. BASIC OPERATIONS OF THE TEST MODE
All operations are performed using the l AMS L knob, YES button, and MENU/NO button. The functions of these buttons are as follows. Function name MENU/NO button YES button l AMS L knob (right and left) l AMS L knob (push) Function Cancels or moves to the next level up in the hierarchy. Establishes. Selects. Establishes the sub menu.

17

4-5. SELECTING THE TEST MODE
There are 25 types of test mode as shown below. The groups can be switched by turning the l AMS L knob. 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. 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 и и и и 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 nonvolatile 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 Mark Group Check Service a a a a a a a a a a a a a a a

О О О О

a a a a a a a a a a a a a a

a a a a a a

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 (О) 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.

18

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 l AMS L knob 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. "CPLAY 1 MID" t "CPLAY 1 OUT" t "CPLAY 1 IN" 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 A button and take out the disc.
Note: The playback start addresses for IN, MID, and OUT are as follows.

IN MID OUT

40h cluster 300h cluster 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 l AMS L knob 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. "CPLAY 1 MID" t "CPLAY 1 OUT" t "CREC 1 IN" 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) 2) Press the MENU/NO button. The display changes to "CREC 1 MODE" and " REC " goes off. Press the l AMS L button 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.

19

4-6. FUNCTIONS OF OTHER BUTTONS
Function PLAY STOP FF FR REC MODE (other models/SF EDIT/SCROLL) PLAY MODE DISPLAY EJECT POWER/REPEAT 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 y CLV-A). Switches the displayed contents each time the button is pressed Ejects the disc Releases the test mode

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. 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

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.

20

4-8. MEANINGS OF OTHER DISPLAYS
Display N X
REC

Contents When Lit Servo ON Tracking servo OFF Recording mode ON CLV low speed mode ABCD adjustment completed Tracking offset cancel ON Tracking auto gain OK Focus auto gain OK Pit High reflection CLV-S CLV LOCK When Off Servo OFF Tracking servo ON Recording mode OFF CLV normal mode Tracking offset cancel OFF

SYNC (other models/TOC EDIT) L. SYNC (other models/A.SPACE) OVER B/1 (REP portion) A-REP TRACK/(LP)4/calender frame DISC/LP2 SLEEP/SHUF MONO

Groove Low reflection CLV-A CLV UNLOCK

4-9. AUTO DIAGNOSIS FUNCTION
This test mode automatically performs C-REC and C-PLAY and checks mainly the characteristics of the optical pick-up. To execute the test mode, first check the laser power and perform AUTO CHECK after Iop Compare. [Operation Procedure] " appears, which means the laser power has not been checked, first check the laser power and 1. Press the YES button. If "LDPWR perform Iop Compare. Then, repeat this step. 2. If there is a disc in the mechanism deck, the disc is forcibly ejected. After "DISC IN" appears, load a recordable test disc (MDW-74/GA-1). 3. When the disc is loaded in step 2, the check automatically starts. 4. While "XX CHECK" is displayed, the check of the item shown in "XX" is in progress. After "06 check" is complete, eject the disc loaded in step 2. When "DISC IN" appears, load the TDYS-1 check disc (MD). 5. After the disc loaded in step 4 is loaded, the check automatically restarts from "07 CHECK". 6. After the check of item 12 is complete, "OK" or "NG" appears. When all items are OK, "CHECK ALL OK" appears. If even one of the items failed, "NG: xxxx" appears. When "CHECK ALL OK" appears, there is no problem in the optical pick-up. Check the operations of the spindle motor, sled motor, etc. If "NG: xxxx" appears, there is an abnormality in the optical pick-up. Replace the optical pick-up.

4-10.

INFORMATION

The version of the software is displayed. [Operation Procedure] 1. When "INFORMATION" appears, press the YES button. 2. The version of the software is displayed. 3. Press the MENU/NO button to end this mode.

4-11.

MEASURE WHEN "MEMORY NG" APPEARS

If there is an abnormality in the data of the non-volatile memory, "E001" or "MEMORY NG" appears so that the MD mechanism deck does not continue to be operated. If either of these messages appears, immediately enter the test mode and perform the following operation. [Operation Procedure] 1. Enter the test mode. (Refer to Section 4-2.) 2. Normally, the test mode selection display appears. If there is an abnormality in the non-volatile memory, the message "INIT EEP?" appears. 3. Press the x button and the EJECT A button at the same time. 4. Turn the l AMS L knob to select "MDM-7A". 5. Press the l AMS L knob. After the non-volatile memory is rewritten, the mode returns to the normal test mode and the test mode selection display appears.

21

SECTION 5 ELECTRICAL ADJUSTMENTS
5-1. PARTS REPLACEMENT AND ADJUSTMENT
If a defect such as dropout caused by the OP is found, check the following. Check Procedure Before Replacement

Start

Laser power check OK

NG

Iop Compare OK

NG

AUTO CHECK OK

NG

Replace the OP or replace the MDM.

Mechanism check of sled, etc. Other cause is likely.

22

Flow During Adjustment

Start

Replace IC195.

YES

After turning on the power again, initialize EEPROM.

Replace either OP or IC195.

YES

ADJ CLEAR

Replace either IC101, IC195 or D101.

YES TEMP ADJUST

Replace either OP, IC190 or IC195.

YES

LDPWR ADJUST

Replace either OP, IC102, IC190 or IC195.

YES

Iop NV Save

Replace either OP, IC101, IC151 or IC195.

YES

EF MO, CD ADJUST FBIAS ADJUST AG SET (MO), (CD)

YES Replace the OP.

op change in Err Display mode Iop Write

Replace the spindle motor.

YES

spdl change in Err Display mode

AUTO CHECK

End adjustment.

23

5-2. PRECAUTIONS FOR CHECKING LASER DIODE EMISSION
To check the emission of the laser diode during adjustments, never view directly from the top as this may lose your eye-sight.

4.

5-3. PRECAUTIONS FOR USE OF OPTICAL PICK-UP (KMS-260B)
As the laser diode in the optical pick-up is easily damaged by static electricity, solder the laser tap of the flexible board of the optical pick-up when using it. Before disconnecting the connector, desolder first. Before connecting the connector, be careful not to remove the solder. Also take adequate measures to prevent damage by static electricity. Handle the flexible board with care as it breaks easily.
Pick-up Flexible board

5.

6.

7.

Use the following tools and measuring devices. и Check Disc (MD) TDYS-1 (Part No. 4-963-646-01) и Test Disc (MDW-74/GA-1) (Part No. 4-229-747-01) и Laser power meter LPM-8001 (Part No. J-2501-046-A) or и MD Laser power meter 8010S (Part No. J-2501-145-A) и Oscilloscope (Measure after performing CAL of prove) и Digital voltmeter и Thermometer и Jig for checking BD board waveform (Part No. : J-2501-196-A for MDM-7A) When observing several signals on the oscilloscope, etc., make sure that VC and ground do not connect inside the oscilloscope. (VC and ground will become short-circuited) Using the above jig enables the waveform to be checked without the need to solder. (Refer to Servicing Notes on page 6) As the disc used will affect the adjustment results, make sure that no dusts nor fingerprints are attached to it.

Laser power meter
When performing laser power checks and adjustment (electrical adjustment), use of the new MD laser power meter 8010S (Part No. J-2501-145-A) instead of the conventional laser power meter is convenient. It sharply reduces the time and trouble to set the laser power meter sensor onto the objective lens of optical pick-up.

Laser tap

Optical pick-up flexible board

5-4. PRECAUTIONS FOR ADJUSTMENTS
1. When replacing the following parts, perform the adjustments and checks with a in the order shown in the following table. Replacement parts Optical IC101 IC102 IC151 IC190 IC195 D101 Pick-up Initial setting of a О О О О a О adjustment value Recording of a О О О О a О Iop information TEMP О a О О О a a CHECK Laser power a О О О a a О adjustment Iop NV Save a О a О a a О Traverse a a О a О a О adjustment Focus bias a a О a О a О adjustment Auto gain a a О a О a О adjustment AUTO a a О a a a О CHECK Set the test mode when performing adjustments. After completing the adjustments, release the test mode. Perform only the adjustments to be needed in the order shown.

5-5. CREATING CONTINUOUSLY-RECORDED DISC
* This disc is used in focus bias adjustment and MO error rate check. The following describes how to create an MO continuous recording disc. 1. Insert a disc (MDW-74/GA-1)(blank disc) commercially available. 2. Turn the l AMS L knob and display "CREC 1 MODE" (C35). 3. Press the YES button again to display "CREC 1 MID". Display "CREC (0300)" and start to recording. (Complete recording within 5 minutes.) 4. Press the MENU/NO button and stop recording . 5. Press the EJECT A button and remove the disc. The above has been how to create a continuous recorded data for the focus bias adjustment and MO error rate check.
Note: Be careful not to apply vibration during continuous recording.

2. 3.

24

5-6. CHECK PRIOR TO REPAIRS
These checks are performed before replacing parts to determine the faulty locations. 5-6-1. TEMP CHECK When performing adjustments, set the internal temperature and room temperature of 22 ░C to 28 ░C. Accurate checks are not possible because the temperature of the IC and diode, etc. rises as time goes by after the power is turned on. If the check is performed in this state, wait for some minutes and perform the check again. Checking Procedure: 1. Turn the l AMS L knob to display "TEMP CHECK" (C12). 2. Press the YES button. 3. "[email protected]@(##) [OK" should be displayed. If "[email protected]@ (##) [NG" is displayed, it means that the results are bad. (@@ indicates the current value set, and ## indicates the value written in the non-volatile memory) 5-6-2. Laser Power Check Before checking, check the IOP value of the optical pick-up. (Refer to 5-8. Recording and Displaying IOP Information) Connection :
Laser power meter

5.

Press the MENU/NO button to display "LDPWR CHECK" and stop the laser emission. (The MENU/NO button is effective at all times to stop the laser emission)

Note: After step 4, each time the YES button is pressed, the display will be switched "LD 0.7 mW $ ", "LD 6.2 mW $ ", and "LD Wp $ ". Nothing needs to be performed here.

5-6-3. Iop Compare The current IOP value when 7 mW laser power is output and the reference IOP value (normally, the value when shipped from the factory) written in the non-volatile memory are compared and the degree of increase or decrease is shown as a percentage.
Note: Do the following operation when the temperature of the optical pick-up is almost the same as room temperature.

Operation Procedure: 1. Turn the l AMS L knob to display "Iop Compare". 2. Press the YES button to start measurement. 3. After the measurement is complete, the display changes to "▒xx% yy". "xx" indicates the degree of increase or decrease. OK or NG is shown in "yy", which indicates whether the increase or decrease is acceptable. 4. Press the MENU/NO button to end Iop Compare.

Optical pick-up objective lens

Digital voltmeter

5-6-4. AUTO CHECK This test mode automatically performs C-REC and C-PLAY and checks mainly the characteristics of the optical pick-up. To execute the test mode, first check the laser power and perform AUTO CHECK after Iop Compare. Operation Procedure: " appears, which 1. Press the YES button. If "LDPWR means the laser power has not been checked, first check the laser power and perform Iop Compare. Then, repeat this step. 2. If there is a disc in the mechanism deck, the disc is forcibly ejected. After "DISC IN" appears, load a recordable test disc (MDW-74/GA-1). 3. When the disc is loaded in step 2, the check automatically starts. 4. While "XX CHECK" is displayed, the check of the item shown in "XX" is in progress. After "06 check" is complete, eject the disc loaded in step 2. When "DISC IN" appears, load the TDYS-1 check disc (MD). 5. After the disc is loaded, the check automatically restarts from "07 CHECK". 6. After the check of item 12 is complete, "OK" or "NG" appears. When all items are OK, "CHECK ALL OK" appears. If even one of the items failed, "NG: xxxx" appears. When "CHECK ALL OK" appears, there is no problem in the optical pick-up, Check the operations of the spindle motor, sled motor, etc. If "NG: xxxx" appears, there is an abnormality in the optical pickup. Replace the optical pick-up.

BD board
CN105 pin 1 (I +3V) CN105 pin 2 (IOP)
+ Г

Checking Procedure: 1. Load the laser power meter into the disc inlet and set it on the objective lens of the optical pick-up. (When it cannot be set properly, press the m button or M button to move the optical pick-up) Connect the digital voltmeter to CN105 pin 1 (I+3V) and CN105 pin 2 (IOP) on the BD board. 2. Then, turn the l AMS L knob to display "LDPWR CHECK" (C13). 3. Press the YES button once to display "LD 0.9 mW $ ". Check that the laser power meter satisfy the specified value. Specified value: Laser power meter reading: 0.84 to 0.92 mW 4. Press the YES button once more to display "LD 7.0 mW $ ". Check that the laser power meter and digital voltmeter satisfy the specified value. Specified Value: Laser power meter reading : 7.0 ▒ 0.2 mW Digital voltmeter reading : Value on the optical pick-up label ▒10%
(Optical pick-up label) KMS-260B 27X40 B0825

lOP = 82.5 mA in this case lOP (mA) = Digital voltmeter reading (mV)/1 ()

25

5-6-5. Other Checks All of the following check modes have already been checked in the section "AUTO CHECK". Therefore, normally do not check them. 1. Traverse Check Connection :
Oscilloscope (DC range) BD board CN105 pin 4 (TE) CN105 pin 6 (VC)
+ Г

V: 0.1 V/div H: 10 ms/div

11. Press the YES button to display "EF MO CHECK" The disc stops rotating automatically. 12. Press the EJECT A button and take out the disc. 13. Load the check disc (MD) TDYS-1. 14. Turn the l AMS L knob and display "EF CD CHECK" (C15). 15. Press the YES button to display "EFB = CD". Servo is imposed automatically. 16. Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not turn the l AMS L knob.

Traverse Waveform
Checking Procedure: 1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105 pin 6 (VC) on the BD board. 2. Load a recordable disc (MDW-74/GA-1). 3. Press the M button to move the optical pick-up outside the pit. 4. Turn the l AMS L knob to display "EF MO CHECK"(C14). 5. Press the YES button to display "EFB = MO-R". 6. Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not turn the l AMS L knob.
A VC B Specified value : Below 10% offset value

17. Press the YES button to display "EF CD CHECK". 18. Press the EJECT A button and take out the test disc (TDYS1). 2. Focus Bias Check Change the focus bias and check the focus tolerance amount. Checking Procedure : 1. Load the recorded test disk (MDW-74/GA-1). (Refer to "5-5. Creating Continuously-Recorded Disc".) 2. Turn the l AMS L knob to display "CPLAY 1 MODE" (C34). 3. Press the YES button to display "CPLAY 1MID". AD = " is 4. Press the MENU/NO button when "C = displayed. 5. Turn the l AMS L knob to display "FBIAS CHECK" (C16). 6. Press the YES button to display " / c = ". The first four digits indicate the C1 error rate, the two digits after [/] indicate ADER, and the 2 digits after [c =] indicate the focus bias value. Check that the C1 error is below 20 and ADER is below 2. 7. Press the YES button to display " / b = ". Check that the C1 error is about 100 and ADER is below 2. 8. Press the YES button to display " / a = ". Check that the C1 error is about 100 and ADER is below 2. 9. Press the MENU/NO button, then press the EJECT A button and take out the test disc.

Traverse Waveform
A VC B Specified value : Below 10% offset value Offset value (%) = IA Г BI О 100 2 (A + B)

7. 8.

Press the YES button to display "EFB = MO-W". Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not turn the l AMS L knob.

Traverse Waveform
A VC B Specified value : Below 10% offset value

9.

Press the YES button to display "EFB = MO-P". Then, the optical pick-up moves to the pit area automatically and servo is imposed. 10. Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not turn the l AMS L knob.

Traverse Waveform
A VC B Specified value : Below 10% offset value

26

3. C PLAY Checking a. MO Error Rate Check Checking Procedure : 1. Load the recorded test disk (MDW-74/GA-1). (Refer to "5-5. Creating Continuously-Recorded Disc".) 2. Turn the l AMS L knob to display "CPLAY 1 MODE" (C34). 3. Press the YES button to display "CPLAY 1 MID". AD = ". 4. The display changes to "C = 5. If the C1 error rate is below 20, check that ADER is 00. 6. Press the MENU/NO button to stop playback, then press the EJECT A button and take out the test disc. b. CD Error Rate Check Checking Procedure : 1. Load the check disc (MD) TDYS-1. 2. Turn the l AMS L knob to display "CPLAY 1 MODE" (C34). 3. Press the YES button twice to display "CPLAY 1 MID". 4. The display changes to "C = AD = ". 5. Check that the C1 error rate is below 20. 6. Press the MENU/NO button to stop playback, then press the EJECT A button and take out the check disc. 4. Self-Recording/playback Check и Create a continuous recording disc using the unit to be repaired and check the error rate. 1. Load a recordable test disc (MDW-74/GA-1). 2. Turn the l AMS L knob to display "CREC 1 MODE" (C34). 3. Press the YES button to display "CREC 1 MID". 4. REC z lights and "CREC(@@@@" (@@@@ indicates the address.). Then recording starts. 5. About one minute later, press the MENU/NO button to stop the continuous recording. 6. Turn the l AMS L knob to display "CPLAY 1 MODE" (C34). 7. Press the YES button to display "CPLAY 1 MID". AD = ". 8. The display changes to "C1 = 9. Check that the C1 error rate is below 20 and ADER is below 2. 10. Press the MENU/NO button to stop playback and press the EJECT A button to remove the disc.

5-8. RECORDING AND DISPLAYING THE IOP INFORMATION
The IOP data can be recorded in the non-volatile memory. The IOP value on the optical pick-up label and the IOP value after the adjustment will be recorded. Recording these data eliminates the need to read the label on the optical pick-up. Recording Procedure : 1. Turn the l AMS L knob to display "Iop Write" (C05), and press the YES button. 2. The display becomes [email protected]@@/@ (@ is an arbitrary number) and the numbers which can be changed will blink. 3. Input the IOP value on the optical pick-up label. To select the number : Turn the l AMS L knob. To select the digit : Press the l AMS L knob 4. When the YES button is pressed, the display becomes "[email protected]@@[email protected]" (@ is an arbitrary number). 5. As the adjustment results are recorded for the 6 value. Leave it as it is and press the YES button. 6. "Complete!" will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become "Iop Write". Display Procedure : 1. Turn the l AMS L knob to display "Iop Read"(C26). 2. "@@[email protected]/##.#" is displayed and the recorded contents are displayed. @@[email protected] indicates the IOP value on the optical pick-up label. ##.# indicates the IOP value after adjustment 3. To end, press the l AMS L button or MENU/NO button to display "Iop Read".

5-9. TEMPERATURE COMPENSATION OFFSET ADJUSTMENT
Save the temperature data at that time in the non-volatile memory as 25 ░C reference data.
Note: 1. Usually, do not perform this adjustment. 2. Perform this adjustment in an ambient temperature of 22 ░C to 28 ░C. Perform it immediately after the power is turned on when the internal temperature of the unit is the same as the ambient temperature of 22 ░C to 28 ░C. 3. When D101 has been replaced, perform this adjustment after the temperature of this part has become the ambient temperature.

5-7. INITIAL SETTING OF ADJUSTMENT VALUE
Note: Mode which sets the adjustment results recorded in the non-volatile memory to the initial setting value. However the results of the temperature compensation offset adjustment will not change to the initial setting value. If initial setting is performed, perform all adjustments again excluding the temperature compensation offset adjustment. For details of the initial setting, refer to "5-4. Precautions for Adjustments" and execute the initial setting before the adjustment as required.

Setting Procedure : 1. Turn the l AMS L knob to display "ADJ CLEAR" (C28). 2. Press the YES button. "Complete!" will be displayed momentarily and initial setting will be executed, after which "ADJ CLEAR" will be displayed.

Adjusting Procedure : 1. Turn the l AMS L knob to display "TEMP ADJUS" (C03). 2. Press the YES button to select the "TEMP ADJUS" mode. 3. "TEMP = [OK" and the current temperature data will be displayed. 4. To save the data, press the YES button. When not saving the data, press the MENU/NO button. 5. When the YES button is pressed, "TEMP = SAVE" will be displayed and turned back to "TEMP ADJUS" display then. When the MENU/NO button is pressed, "TEMP ADJUS" will be displayed immediately. Specified Value : " should be within "E0 - EF", "F0 - FF", "00 The "TEMP = 0F", "10 - 1F" and "20 - 2F".

27

5-10.

LASER POWER ADJUSTMENT

Check the IOP value of the optical pick-up before adjustments. (Refer to 5-8. Recording and Displaying IOP Information) Connection :
Laser power meter

Optical pick-up objective lens
Digital voltmeter BD board CN105 pin 1 (I +3V) CN105 pin 2 (IOP)
+ Г

12. Press the YES button. When the display becomes [email protected]@@[email protected] (@ is an arbitrary number), press the YES button to display "[email protected]@@[email protected]" (@ is an arbitrary number). 13. The numbers which can be changed will blink. Input the Iop value noted down at step 9. To select the number : Turn the l AMS L knob. To select the digit : Press the l AMS L knob. 14. When the YES button is pressed, "Complete!" will be displayed momentarily. The value will be recorded in the nonvolatile memory and the display will become "Iop Write".
Note: After step 4, each time the YES button is pressed, the display will be switched "LD 0.7 mW $ ", "LD 6.2 mW $ ", and "LD Wp $ ". Nothing needs to be performed here.

5-11.

Iop NV Save

Adjusting Procedure : 1. Load the laser power meter into the disc inlet and set it on the objective lens of the optical pick-up. (When it cannot be set properly, press the m button or M button to move the optical pick-up) Connect the digital voltmeter to CN105 pin 1 (I+3V) and CN105 pin 2 (IOP) on the BD board. 2. Turn the l AMS L knob to display "LDPWR ADJUS" (C04). 3. Press the YES button once to display "LD 0.9 mW $ ". 4. Turn the l AMS L knob so that the reading of the laser power meter becomes 0.85 to 0.91 mW. Press the YES button after setting the range knob of the laser power meter, and save the adjustment results in the non-volatile memory. ("LD SAVE $ " will be displayed for a moment) 5. Then "LD 7.0 mW $ " will be displayed. 6. Turn the l AMS L knob so that the reading of the laser power meter becomes 6.9 to 7.1 mW, press the YES button to save it. ("LD SAVE $ " will be displayed for a moment)
Note: Do not perform the emission with 7.0 mW more than 15 seconds continuously.

Write the reference value in the non-volatile memory for "Iop Comparer". Do not perform this operation other than when performing the laser power adjustment while replacing the OP, etc. and when replacing IC102 as the reference value is rewritten. Otherwise, deterioration judgment of the OP is wrong.
Note: Perform this operation when the temperature of the optical pick-up is almost same as the room temperature.

Operation Procedure: 1. Turn the l AMS L knob to display "Iop NV Save" (C06). 2. Press the YES button to display "Iop [stop]". 3. After the display changes to "Iop=xxsave?", press the YES button. 4. "Complete!" is displayed momentarily and the display changes to "Iop 7.0mW". 5. After the display changes to "Iop=yysave?", press the YES button. 6. The "Complete!" message indicates that the operation has ended.

7. 8.

9.

Then, turn the l AMS L knob to display "LDPWR CHECK" (C13). Press the YES button once to display "LD 0.9 mW $ ". Check that the reading of the laser power meter become 0.85 to 0.91 mW. Press the YES button once more to display "LD 7.0 mW $ ". Check that the reading the laser power meter and digital voltmeter satisfy the specified value. Note down the digital voltmeter reading value.

Specified Value: Laser power meter reading : 7.0 ▒ 0.2 mW Digital voltmeter reading : Value on the optical pick-up label ▒10%
(Optical pick-up label) KMS-260B 27X40 B0825

lOP = 82.5 mA in this case lOP (mA) = Digital voltmeter reading (mV)/1 ()

10. Press the MENU/NO button to display "LDPWR CHECK" and stop the laser emission. (The MENU/NO button is effective at all times to stop the laser emission.) 11. Turn the l AMS L knob to display "Iop Write"(C05).

28

5-12.

TRAVERSE ADJUSTMENT
Oscilloscope (DC range) BD board

Connection:

11. Turn the l AMS L knob until the waveform of the oscilloscope moves closer to the specified value. In this adjustment, waveform varies at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.
V: 0.1 V/div H: 10 ms/div

CN105 pin 4 (TE) CN105 pin 6 (VC)

+ Г

Traverse Waveform
A

Adjusting Procedure: 1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105 pin 6 (VC) on the BD board. 2. Load a recordable test disc (MDW-74/GA-1). 3. Press the M button to move the optical pick-up outside the pit. 4. Turn the l AMS L knob to display "EF MO ADJUS" (C07). 5. Press the YES button to display "EFB = MO-R". 6. Turn the l AMS L knob so that the waveform of the oscilloscope becomes the specified value. (When the l AMS L knob is turned, the of "EFB= MO-R" changes and the waveform changes.) In this adjustment, waveform varies at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.

VC B Specification A = B

Traverse Waveform
A VC B Specification A = B

12. Press the YES button, and save the adjustment results in the non-volatile memory. ("EFB = SAV" will be displayed for a moment.) Next "EF MO ADJUS" is displayed. The disc stops rotating automatically. 13. Press the EJECT A button and take out the disc. 14. Load the check disc (MD) TDYS-1. 15. Turn the l AMS L knob to display "EF CD ADJUS" (C08). CD". Servo is 16. Press the YES button to display "EFB = imposed automatically. 17. Turn the l AMS L knob so that the waveform of the oscilloscope moves closer to the specified value. In this adjustment, waveform varies at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.

Traverse Waveform
A VC B Specification A = B

7.

Press the YES button and save the result of adjustment to the non-volatile memory ("EFB = SAV" will be displayed for a MO-W" will be displayed). moment. Then "EFB = Turn the l AMS L knob so that the waveform of the oscilloscope becomes the specified value. (When the l AMS L knob is turned, the of "EFBMO-W" changes and the waveform changes.) In this adjustment, waveform varies at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.

8.

18. Press the YES button, display "EFB = SAV" for a moment and save the adjustment results in the non-volatile memory. Next "EF CD ADJUS" will be displayed. 19. Press the EJECT A button and take out the test disc TDYS-1.

Traverse Waveform
A VC B Specification A = B

9.

Press the YES button, and save the adjustment results in the non-volatile memory. ("EFB = SAV" will be displayed for a moment) 10. "EFB = MO-P" will be displayed. The optical pick-up moves to the pit area automatically and servo is imposed.

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5-13.

FOCUS BIAS ADJUSTMENT

5-15.

FOCUS BIAS CHECK

Change the focus bias and check the focus tolerance amount. Adjusting Procedure : 1. Load the continuously-recorded disc (MDW-74/GA-1). (Refer to "5-5. Creating Continuously-Recorded Disc") 2. Turn the l AMS L knob to display "CPLAY 1 MODE" (C34). 3. Press the YES button to display "CPLAY 1 MID". 4. Press the MENU/NO button when "C = AD = " is displayed. 5. Turn the l AMS L knob to display "FBIAS ADJUS" (C09). 6. Press the YES button to display " / a = ". The first four digits indicate the C1 error rate, the two digits after [/] indicate ADER, and the 2 digits after [a =] indicate the focus bias value. 7. Turn the l AMS L knob clockwise and find the focus bias value at which the C1 error rate becomes about 200. 8. Press the YES button to display " / b = ". 9. Turn the l AMS L knob counterclockwise and find the focus bias value at which the C1 error rate becomes about 200. The C1 error rate must be almost same as the value set at step 7. 10. Press the YES button to display " / c = ". 11. Check that the C1 error rate is below 20 and ADER is 00. Then press the YES button. 12. If the "( )" in " - - ( )" is above 20, press the YES button. If below 20, press the MENU/NO button and repeat the adjustment from step 2. 13. Press the EJECT A button and take out the disc.
Note 1: The relation between the C1 error and focus bias is as shown in the following figure. Find points A and B in the following figure using the above adjustment. The focal point position C is automatically calculated from points A and B. Note 2: As the C1 error rate changes, perform the adjustment using the average value.

Checking Procedure : 1. Load the continuously-recorded disc (MDW-74/GA-1). (Refer to "5. Creating Continuously-Recorded Disc") 2. Turn the l AMS L knob to display "CPLAY 1 MODE" (C34). 3. Press the YES button twice to display "CPLAY 1 MID". 4. Press the MENU/NO button when "C = AD = " is displayed. 5. Turn the l AMS L knob to display "FBIAS CHECK" (C16). / c = ". 6. Press the YES button to display " The first four digits indicate the C1 error rate, the two digits after [/] indicate ADER, and the 2 digits after [c =] indicate the focus bias value. Check that the C1 error is below 20 and ADER is below 2. 7. Press the YES button and display " / b = ". Check that the C1 error is about 100 and ADER is below 2. 8. Press the YES button and display " / a = ". Check that the C1 error is about 100 and ADER is below 2 9. Press the MENU/NO button, then press the EJECT A button and take out the disc.
Note: If the C1 error rate and ADER are above other than the specified value at points a (step 8. in the above) or b (step 7. in the above), the focus bias adjustment may not have been carried out properly. Perform the adjustment from the beginning again.

5-16.

AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT

Be sure to perform this adjustment when the optical pick-up is replaced. If the adjustment results becomes "Adjust NG!", the optical pickup may be faulty or the servo system circuits may be abnormal. 5-16-1. CD Auto Gain Control Output Level Adjustment Adjusting Procedure : 1. Load the check disc (MD) TDYS-1. 2. Turn the l AMS L knob to display "AG Set (CD)" (C11). 3. When the YES button is pressed, the adjustment will be performed automatically. "Complete!!" will then be displayed momentarily when the value is recorded in the non-volatile memory, after which the display changes to "AG Set (CD)". 4. Press the EJECT A button and take out the check disc. 5-16-2. MO Auto Gain Control Output Level Adjustment Adjusting Procedure : 1. Load the test disc (MDW-74/GA-1). 2. Turn the l AMS L knob to display "AG Set (MO)" (C10). 3. When the YES button is pressed, the adjustment will be performed automatically. "Complete!!" will then be displayed momentarily when the value is recorded in the non-volatile memory, after which the display changes to "AG Set (MO)". 4. Press the EJECT A button and take out the test disc.

5-14.

ERROR RATE CHECK

5-14-1. CD Error Rate Check Checking Procedure : 1. Load the check disc (MD) TDYS-1. 2. Turn the l AMS L knob and display "CPLAY 1 MODE" (C34). 3. Press the YES button and display "CPLAY 1 MID". AD = ". 4. The display changes to "C = 5. Check that the C1 error rate is below 20. 6. Press the MENU/NO button to stop playback, then press the EJECT A button and take out the check disc. 5-14-2. MO Error Rate Check Checking Procedure : 1. Load the continuously-recorded disc (MDW-74/GA-1). (Refer to "5. Creating Continuously-Recorded Disc") 2. Turn the l AMS L knob to display "CPLAY 1 M