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Self Diagnosis, Dolby -
Service Manual
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MDS-SP55
SERVICE MANUAL
Ver 1.1 2001. 06
AEP Model UK Model E Model
MDS-SP55 is the MD section in CMT-SP55MD, and MDS-SP55 is sold in the option as a minidisk deck of CMT-SP55TC.
Model Name Using Similar Mechanism MD Mechanism Type Optical Pick-up Type
MDS-JE330 MDM-5A KMS-260B/S1NP
SPECIFICATIONS
System Laser Laser output MiniDisc digital audio system Semiconductor laser (=780 nm) Emission duration: continuous Max. 44.6 µW* *This output is the value measured at a distance of 200 mm from the objective lens surface on the Optical Pick-up Block with 7 mm aperture. 44.1 kHz 20 Hz 20 kHz General Dimensions (w/h/d) incl. projecting parts and controls Approx. 202 × 101 × 298 mm Mass Approx. 1.7 kg Supplied accessories System cable (1) Digital cable (1)
Sampling frequency Frequency response Inputs DIGITAL OPTICAL CD IN: Optical DIGITAL OPTICAL AUX IN: Optical Output DIGITAL OPTICAL OUT: Optical
Design and specifications are subject to change without notice.
MINIDISC DECK
9-929-537-12
2001F0200-1 © 2001.6
Sony Corporation
Home Audio Company Shinagawa Tec Service Manual Production Group
1
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)".
C13/REC Error Recording could not be performed properly. cMove the system to a stable place, and start recording over from the beginning. The MD is dirty or scratched, or the MD does not meet the standards. cReplace the MD and start recording over from the beginning. C13/Read Error The MD deck cannot read the disc information properly. cRemove the MD once, then insert it again. C14/Toc Error The MD deck cannot read the disc information properly. cReplace the MD. cErase all the recorded contents of the MD using the All Erase function (See page 32). C41/Cannot Copy The sound source is a copy of a commercially available music software, or you tried to record a CD-R (Recordable CD). cThe Serial Copy Management System prevents making a digital copy. You cannot record a CD-R (see page 43). C71/Check OPT-IN This appears momentarily because of the signal of the digital broadcast during recording. cThere is no affect on the recorded contents. No component is connected to the DIGITAL OPTICAL IN jack, or a digital component is not connected properly. cConnect a digital component to the DIGITAL OPTICAL IN jack properly using a digital connecting cable (an optical cable) (not supplied (See page 39). The connected digital component is not turned on. cSee the operating instructions supplied with the connected component and confirm whether the component is turned on. The digital connecting cable (an optical cable) connected to the DIGITAL OPTICAL IN jack is pulled out, or the connected digital component is turned off during digital recording. cConnect the cable, or turn on the digital component.
Self-diagnosis Display
This system has a Self-diagnosis display function to let you know if there is a system malfunction. The display shows a code made up of three letters and a message alternately to show you the problem. To solve the problem refer to the following list. If any problem persists, consult your nearest Sony dealer.
C11/Protected The MD is protected against erasure. cRemove the MD and slide the tab to close the slot (See page 11). C12/Cannot Copy You tried to record a CD or MD with a format that the system does not support, such as a CDROM. cRemove the disc and turn off the system once, then turn it on again.
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 (MD) to exit the mode. 1. When the power OFF (STANDBY), press the ?/1 button (TA) while pressing the s button (MD) and ENTER/YES button (MD) together. 2. Press the MENU/NO button, and when "Check" is displayed. 3. Rotate the l L knob (MD) and when "[Service]" is displayed, press the ENTER/YES button (MD). 4. Rotate the l L knob (MD) and display "ERR DP MODE". 5. Pressing the ENTER/YES button (MD) sets the error history mode and displays "total rec". 6. Select the contents to be displayed or executed using the l L knob (MD). 7. Pressing the CD SYNC REC button (MD) and to execute the contents selected. 8. Pressing the CD SYNC REC button (MD) another time returns to step 5. 9. Pressing the MENU/NO button (MD) displays "ERROR DP MODE" and exits the error history mode. 10.To exit the test mode, press the ?/1 button (TA). The unit sets into the STANDBY state, the disc is ejected, and the test mode ends.
2
ITEMS OF ERROR HISTORY MODE ITEMS AND CONTENTS
Selecting the Test Mode Display total rec Details of History Displays the recording time. Displayed as "rssssssh". The displayed time is the total time the laser is set to the high power state. This is about 1/4 of the actual recording time. The time is displayed in decimal digits from 0h to 65535h. Displays the play time. Displayed as "pssssssh". The time displayed is the total actual play time. Pauses are not counted. The time is displayed in decimal digits from 0h to 65535h. Displays the total number of retries during recording and number of retry errors during play. Displayed as "rss pss". "r" indicates the retries during recording while "p" indicates the retry errors during play. The number of retries and retry errors are displayed in hexadecimal digits from 00 to FF. Displays the total number of errors. Displayed as "total ss". The number of errors is displayed in hexadecimal digits from 00 to FF. Displays the 10 latest errors. Displayed as "0s E@@". s indicates the history number. The smaller the number, the more recent is the error. (00 is the latest). @@ indicates the error code. Refer to the following table for the details. The error history can be switched by rotating the l L knob (MD). Mode which erases the "retry err", "total err", and "err history" histories. When returning the unit to the customer after completing repairs, perform this to erase the past error history, After pressing the CD SYNC REC button (MD) when "er refresh" appears, press ENTER/YES button (MD) to erase the history. "Complete!!" will be displayed momentarily. Be sure to check the following when this mode has been executed. · The data has been erased. · The mechanism operates normally when recording and play are performed. Mode which erases the "total rec" and "total play" histories. These histories serve as approximate indications of when to replace the optical pick-up. If the optical pick-up has been replaced, perform this operation and erase the history. After pressing the CD SYNC REC button (MD) when "tm refresh?" is displayed, press the ENTER/YES button (MD) to erase the history. "Complete!" will be displayed momentarily. Be sure to check the following when this mode has been executed. · The data has been erased. · The mechanism operates normally when recording and play are performed.
total play
retry err
total err
err history
er refresh
tm refresh?
Table of Error Codes Error Code E00 E01 E02 E03 E04 No error Read error. PTOC cannot be read (DISC ejected) TOC error. UTOC error (DISC not ejected) Loading error Address cannot be read (Servo has deviated) E0A Details of Error Error Code E05 E06 E07 E08 E09 Details of Error FOK has deviated Cannot focus (Servo has deviated) Recording retry Recording retry error Playback retry error (Access error) Play retry error (C2 error)
3
CAUTION Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the equipment manufacturer. Discard used batteries according to manufacture's instructions. ADVARSEL! Lithiumbatteri - Eksplosionsfare ved fejlagtig håndtering. Udskiftning må kun ske med batteri af samme fabrikat og type. Levér det brugte batteri tilbage til leverandųren. ADVARSEL Eksplosjonsfare ved feilakting skifte av batteri. Benytt samme batteritype eller en tilsvarende type anbefalt av apparatfabrikanten. Brukte batterier katterier kasseres i henhold til fabrikantens VARNIG Explosionsfara vid felaktigt batteribyte. Använd samma batterityp eller en likvärdig typ som rekommenderas av apparattillverkaren. Kassera använt batteri enligt gällande föreakrifter. VAROITUS Parist voi räjähtää, jos se on virheellisesti asennettu. Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin. Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.
Laser component in this product is capable of emitting radiation exceeding the limit for Class 1. This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior. This 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 · 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.
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.
4
TABLE OF CONTENTS 1. SERVICING NOTE .......................................................... 6 2. GENERAL ........................................................................ 13 3. DISASSEMBLY
3-1. Case ..................................................................................... 14 3-2. Front Panel Assy ................................................................. 14 3-3. MD Mechanism Deck (MDM-5A) ..................................... 15 3-4. Main Board ......................................................................... 15 3-5. Slider (Cam) ........................................................................ 16 3-6. BD Board ............................................................................ 16 3-7. Over Write Head ................................................................. 17 3-8. Optical Pick-up (KMS-260A/J1N) ..................................... 17 3-9. Spindle Motor, Sled Motor ................................................. 17
4. TEST MODE ..................................................................... 18 5. ELECTRICAL ADJUSTMENTS ............................... 22 6. DIAGRAMS
6-1. Block Diagrams · BD Section ....................................................................... 32 · Main Section .................................................................... 33 6-2. Printed Wiring Board BD Section ................................. 34 6-3. Schematic Diagram BD (1/2) Section ........................... 35 6-4. Schematic Diagram BD (2/2) Section ........................... 36 6-5. Schematic Diagram Main (1/2) Section ........................ 37 6-6. Schematic Diagram Main (2/2) Section ........................ 38 6-7. Printed Wiring Board Main Section .............................. 39 6-8. Printed Wiring Board Panel Section ............................. 40 6-9. Schematic Diagram Panel Section ................................ 41 6-10. Schematic Diagram BD Switch Section .................... 42 6-11. Printed Wiring Board BD Switch Section .................. 42 6-12. IC Block Diagrams ........................................................... 42 6-13. IC Pin Functions ............................................................... 45
7. EXPLODED VIEWS
7-1. Case and Front Panel Section ............................................. 50 7-2. Mechanism Deck Section (MDM-5A) ................................ 51 7-3. Base Unit Section (MBU-5A) ............................................. 52
8. ELECTRICAL PARTS LIST ........................................ 53
MODEL IDENTIFICATION
-- BACK PANEL --
MODEL
AEP, UK, AED models HK, MY, SP models KR model Parts No. · Abbreviation AED : North European model MY : Malaysia model SP : Singapore model HK : Hong kong model KR : Korea model
PARTS No.
4-229-665-0s 4-229-665-2s 4-229-665-3s
5
SECTION 1 SERVICING NOTE
This unit cannot be repaired by itself. When repairing, connect the whole system except for the speaker. CD Text Display · This unit displays CD text. Text is displayed for the first 50 track only and will not be displayed from the 51st track onwards. Do not suspect a fault in this case. In some cases, some special characters will not be displayed and may be replaced by other characters. Do not suspect a fault in this case. Cold Reset · The cold reset clears all data including preset data stored in the RAM to initial conditions. Execute this mode when returning the set to the customer. Procedure : 1. When the power ON, press the ?/1 button (TA) while pressing the TUNING MODE button (ST) and ML buttons (CD) together. 2. "COLD RESET" is displayed on the fluorescent indicator tube and reset is executed. Hot Reset · This mode reset the preset data kept in the memory. The hot reset mode functions same as if the power cord is plugged in and out. Procedure : 1. When the power ON, press the ?/1 button (TA) while pressing the TUNING MODE button (ST) and lm buttons (CD) together. 2. Turn off the unit and reset is executed. GC Test Mode Procedure : 1. When the power ON, press the ?/1 button (TA) while pressing the TUNING MODE button (ST) and PLAY MODE buttons (CD) together. 2. LCD are all turned on. 3. Press TUNING MODE button (ST) to enter the model destination indecation mode. "SP55 CE2" or "SP55 ASIA2" appears. 4. Every pressing of TUNING MODE button (ST) changes the display in the following order. MC Version t CD Version t ST Version t TC Version t TA Version t TM Version t model destination display. 5. Press DISPLAY button (ST) and the date appears as " 00615a " Every pressing of DISPLAY button (ST) changes the display in the Version display and model destination display. 6. Press TUNER/BAND button (ST) to enter the key check mode. 7. In the key check mode, the fluorescent indicator tube displays "Key 0 Vol 0". Each time a button is pressed, "Key" value increases. However, once a button is pressed, it is no longer taken into account. "Vol" Value increases like "1, 2, 3 ..." if rotating VOLUME knob (TA) in the clockwise direction, or decreases like "0, 9, 8 ..." if rotating in the counterclockwise diretion. 8. To exit from this mode, disconnect the power cord.
6
JIG FOR CHECKING BD BOARD WAVEFORM
The special jig (J-2501-149-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 I+3V IOP TEO VC RF : : : : : : Ground For measuring IOP (Check the deterioration of the optical pick-up laser) For measuring IOP (Check the deterioration of the optical pick-up laser) TRK error signal (Traverse adjustment) Reference level for checking the signal RF signal (Check jitter)
Mechanism deck
CN110 6P connector
5P connector
VC RF TEO IOP I+3V GND
RF VC TEO IOP I+3V GND
1 RF VC TEO IOP 5 I-3V
For MDM-3
1 VC RF TEO For IOP MDM-5A I+3V 6 GND
7
IOP DATA RECORDING AND DISPLAY WHEN OPTICAL PICK-UP AND NON-VOLATILE MEMORY (IC171 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 label of the optical pick-up. When replacing the optical pick-up or non-volatile memory (IC171 of BD board), record the IOP value on the optical pick-up according to the following procedure. Record Precedure: 1. When the power OFF (STANDBY), press the ?/1 button (TA) while pressing the s button (MD) and ENTER/YES button (MD) together. 2. Press the MENU/NO button (MD), and when "Check" is displayed. 3. Rotate the l L knob (MD) to display "MD [Service]", and press the ENTER/YES button (MD). 4. Rotate the l L knob (MD) to display "MD lop Write", and press the ENTER/YES button (MD). 5. The display becomes "MD Ref=@@@.@" (@ is an arbitrary number) and the numbers which can be changed will blink. 6. Input the IOP value written on the optical pick-up. To select the number : Press the MENU/NO button (MD), and when "Check" is displayed. To select the digit : Press the CD SYNC REC button (MD). 7. When the ENTER/YES button (MD) is pressed, the display becomes "MD Measu=@@@.@" (@ is an arbitrary number). 8. As the adjustment results are recorded for the 6 value. Leave it as it is and press the ENTER/YES button (MD). 9. "MD Complete!" will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become "MD Iop Write". 10. Press the ?/1 button (TA) to complete. Display Precedure: 1. When the power OFF (STANDBY), press the ?/1 button (TA) while pressing the s button (MD) and ENTER/YES button (MD) together. 2. Press the MENU/NO button (MD), and when "Check" is displayed. 3. Rotate the l L knob (MD) to display "MD [Service]", and press the ENTER/YES button (MD). 4. Rotate the l L knob (MD) to display "MD lop Read". 5. "MD @@.@/##.#" is displayed and the recorded contents are displayed. @@.@ : indicates the Iop value labeled on the pick-up. ##.# : indicates the Iop value after adjustment 6. To end, press the MENU/NO button (MD) to display "MD Iop Read". Then press the ?/1 button (TA).
8
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) · 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 pick-up Iop value ± 10mA · Traverse waveform Specified value : Below 10% offset · Error rate check Specified value : For points a, b, and c C1 error : Below 220 AD error : Below 2 · Error rate check Specified value: a.When using test disc (MDW-74/GA-1) C1 error : Below 80 AD error : Below 2 b.When using check disc (TDYS-1) C1 error : Below 50 · CPLAY error rate check Specified value: C1 error : Below 80 AD error : Below 2 Measure if unsatisfactory: · Clean the optical pick-up · Adjust again · Replace the optical pick-up · Replace the optical pick-up
Laser power check (5-6-2 : See page 24)
Traverse check (5-6-3 : See page 24) Focus bias check (5-6-4 : See page 25)
· Replace the optical pick-up · Replace the optical pick-up
C PLAY check (5-6-5 : See page 25)
· Replace the optical pick-up
Self-recording/playback check (REC/PLAY) (5-6-6 : See page 25)
TEMP check (Temperature compensation offset check) (5-6-1 : See page 24)
· Unsatisfactory if displayed as T=@@ (##) [NG] NG (@@, ## are both arbitrary numbers)
If always unsatisfactory: · Replace the overwrite head · Check for disconnection of the circuits around the overwrite head If occasionally unsatisfactory: · Check if the overwrite head is distorted · Check the mechanism around the sled · Check for disconnection of the circuits around D101 (BD board) · Check the signals around IC101, IC121, 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.
FORCED RESET
The system microprocessor can be reset in the following procedure. Use these procedure when the unit cannot be operated normally due to the overrunning of the microprocessor, etc. Procedure : Remove the short-pin attached to CN821, and power off or del AC cable, and then attach it again. Remove the AC code, and wait for about five seconds, and turn on the power again, and put the short-pin. [MAIN BOARD] (Component Side)
CN821
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. Load a recordable disc whose contents can be erased, into the unit. 2. Press the MENU/NO button (MD). When "Edit/Menu" is displayed on the LCD display, Rotate the l L knob (MD) to display "All Erase??". 3. Press the ENTER/YES button (MD). 4. "All Erase??" is displayed on the LCD display. 5. Press the ENTER/YES button (MD) to display "Complete!!", and press the s button (MD) immediately. Wait for about 10 seconds while pressing the button. 6. When the "MD Blank disk" displayed on the LCD display goes off, release the s button (MD). 7. Press the z REC button (MD) to enter recording standby. Then press the S button (MD) and start recording. In about 2 seconds, the record mode retry cause is displayed. (Fig.1) If recording cannot be performed, rotate the FUNCTION konb (TA) and set a different section. 8. To check the "track mode", stop recording by pressing s button (MD) and press the H button (MD) to start play and the track information in the play mode appears. 9. To exit the test mode, press the ?/1 button (TA), and turn OFF the power. When "STNDBY" disappears, disconnect the power plug from the outlet. If the test mode cannot be exited, refer to "Forced Reset"on page 9.
Fig. 1 Reading the Test Mode Display (During recording and stop)
RTs@@c##c** Fluorescent display tube display @@ : Cause of retry ## : Number of retries ** : Number of retry errors Reading the Retry Cause Display Higher Bits Hexadecimal 8 Bit Binary 0 0 0 0 0 0 0 1 4 0 0 0 0 0 0 1 0 2 0 0 0 0 0 1 0 0 1 0 0 0 0 1 0 0 0 Lower Bits 8 0 0 0 1 0 0 0 0 4 0 0 1 0 0 0 0 0 2 0 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 Hexadecimal 01 02 04 08 10 20 40 80
Fig. 2 Reading the Test Mode Display (During playback)
@@####**$$ Fluorescent display tube display @@ ## ** $$ : : : : Parts No. (name of area named on TOC) Cluster } Address (Physical address on disc) Sector Track mode (Track information such as copyright information of each part) Occurring conditions When track jump (shock) is detected When ADER was counted more than five times continuously 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
Cause of Retry shock ader5
b7 b6 b5 b4 b3 b2 b1 b0
Discontinuous address When ADIP address is not continuous DIN unlock FCS incorrect IVR rec error CLV unlock Access fault
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".
10
Reading the Track Mode Display Higher Bits Hexadecimal 8 Bit Binary 0 0 0 0 0 0 0 1 4 0 0 0 0 0 0 1 0 2 0 0 0 0 0 1 0 0 1 0 0 0 0 1 0 0 0 Lower Bits 8 0 0 0 1 0 0 0 0 4 0 0 1 0 0 0 0 0 2 0 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 Hexadecimal 01 02 04 08 10 20 40 80 When 0 Emphasis OFF Monaural This is 2-bit display. Normally 01. 01:Normal audio. Others:Invalid Audio (Normal) Original Copyright Write prohibited Invalid Digital copy No copyright Write allowed Emphasis ON Stereo Details When 1
b7 b6 b5 b4 b3 b2 b1 b0
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
11
SERVICING POSITION
1. 2. 3. 4. Remove the four screws securing the upper case, and remove the upper case. Remove the three screws A securing the rear panel. Remove the two craws B securing the MAIN board. Remove the MAIN board with the rear panel.
B
A
B
12
SECTION 2 GENERAL
1 2 34
5
6
7
8
qh
qg
qf qd qs qa 0
9
1 2 3 4 5 6 7 8
CD SYNC REC button CD SYNC REC indicator z REC button z REC indicator MENU/NO button ENTER/YES button CLEAR button A button
9 q; qa qs qd qf qg qh
l L knob s button S indicator S button H insdicator H button M button m button
13
SECTION 3 DISASSEMBLY
Set Case Front Panel Assy Main Board (Page 15) MD Mechanism Deck (MDM-5A) (Page 15) Slider (Cam) (Page 16) BD Board (page 16) Spindle Motor, Sled Motor (page 17) Optical pick-up (page 17)
Over Write Head (Page17)
Note: Follow the disassembly procedure in the numerical order given.
3-1. CASE
4 case
3
1 two screws (case 3 TP2)
2
2
1 two screws (case 3 TP2)
3-2. FRONT PANEL ASSY
5 front panel assy claws
1 flat type wire (11 core) (CN791)
claws
3 two foot assy's 4 screw (BVTP 3x12) 2 two screws (BVTP 3x12)
14
3-3. MD MECHANISM DECK (MDM-5A)
4 two screws (BVTPWH M3) 5 MD mechanism deck 4 two screws (BVTPWH M3)
1 flat type wire (23 core) (CN702) 2 flat type wire (21 core) (CN501) 3 connector (CN701)
3-4. MAIN BOARD
5 main board
3 panel back
1 six screws (BVTP 3x8)
2 three screws (BVTP 3x8)
4 claw
4 claw
15
3-5. SLIDER (CAM)
6 slider (cam) · Note for installation of Slider (CAM) A Set the shaft of Cam gear to be at the position in the figure.
2 bracket (guide L) 1 two screws (BTP 2.6x6)
3 leaf spring
Set the shaft of Lever (O/C) to be at the position in the figure.
4 two screws (BTP 2.6x6)
When attaching the slider (cam), this part of the over write head should be inside arrow A. 5 bracket (guide R)
3-6. BD BOARD
2 base unit (MBU-5A) 6 flexible board
7 flexible board 1 three screws (BTP 2.6x6) spindle motor CN104 CN110 4 Remove the two solders. 8 BD (MD) board 5 screw (M 1.7x4) sled motor CN101 3 Remove the two solders. Read wire's color Red : + Black : +
16
3-7. OVER WRITE HEAD
3-8. OPTICAL PICK-UP (KMS-260B/S1NP)
Note: Turn the optical pick-up inside out, and pull out the flexible board.
2 screw (P 1.7x6)
5 optical pick-up (for MD)
3 over write head (HR901) 1 flexible board
A 3 main shaft 1 screw (B 2x8) 4 flexible board 2 leaf spring (SHAFT)
3-9. SPINDLE MOTOR, SLED MOTOR
3 gear (SL-B)
4 three screws (B 2x5)
1 screw (M1.7)
2 gear (SL-A)
5 spindle motor (M901) The BD (MD) board is soldered at two parts. (See page 16.)
6 two screws (P 1.7x2.5)
7 sled motor (M902)
17
SECTION 4 TEST MODE
4-1. PRECAUTIONS FOR USE OF TEST 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 A button (MD) 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 A button (MD) after pressing the MENU/NO button (MD) and the rotation of disc is stopped. 4-1-1. Recording laser emission mode and operating buttons · · · · · · Continuous recording mode (MD CREC MODE) Laser power check mode (MD LDPWR CHECK) Laser power adjustment mode (MD LDPWR ADJUST) Traverse (MO) check (MD EF MO CHECK) Traverse (MO) adjustment (MD EF MO ADJUST) When pressing the z REC button (MD).
4-2. SETTING THE TEST MODE
The following are two methods of entering the test mode. 1. Rotate the FUNCTION knob (TA), and set the function to "MD" before hand. When the power OFF (STANDBY), press the ?/1 button (TA) while pressing the s button (MD) and ENTER/YES button (MD) together. 2. Press the MENU/NO button (MD), and when "MD Check" is displayed. 3. When the test mode is set, "MD [Check]" will be displayed. Rotate the l L knob (MD) switches between the following four groups; ···Tt MD Check Tt MD Adjust Tt MD Service Tt MD Develop Tt ···.
4-3. EXITING THE TEST MODE
Press the ?/1 button (TA). The disc is ejected when loaded, and "Standby" display blinks, and the STANDBY state is set.
4-4. BASIC OPERATIONS OF THE TEST MODE
All operations are performed using the l L knob (MD), ENTER/YES button (MD), and MENU/NO button (MD). The functions of these buttons are as follows.
Function name l L knob (MD) ENTER/YES button (MD) MENU/NO button (MD)
Function Changes parameters and modes Proceeds onto the next step. Finalizes input. Returns to previous step. Stops operations.
18
4-5. SELECTING THE TEST MODE
There are 31 types of test modes as shown below. The groups can be switched by rotating the l L knob (MD). After selecting the group to be used, press the ENTER/YES button (MD). After setting a certain group, rotating the l L knob (MD) switches between these modes. Refer to "Group" in the table for details selected. All items used for servicing can be treated using group S. So be carefully not to enter other groups by mistake.
Display MD TEMP CHECK MD LDPWR CHECK MD EF MO CHECK MD EF CD CHECK MD FBIAS CHECK MD S curve CHECK MD VERIFY MODE MD DETRK CHECK MD TEMP ADJUST Contents Temperature compensation offset check Laser power check Traverse (MO) check Traverse (CD) check Focus bias check S letter check Non-volatile memory check Detrack check Temperature compensation offset adjustment (X) (X) (X) Mark C C C C C C C C A A A A A (X) (!) (X) (X) S (X) (X) (X) (X) (X) (X) A A A C A C C C A A S S S S S S S S D D D D D D D D S S S S S D D D Group (*) S
S
S S S
MD LDPWR ADJUST Laser power adjustment MD EF MO ADJUST MD EF CD ADJUST MD FBIAS ADJUST MD EEP MODE MD MANUAL CMD MD SVDATA READ MD ERR DP MODE MD SLED MOVE MD ACCESS MODE MD 0920 CHECK MD HEAD ADJUST MD CPLAY2 MODE MD CREC2 MODE MD ADJ CLEAR MD AG Set (MO) MD AG Set (CD) MD Iop Read MD Iop Write MD INFORMATION MD CPLAY MODE MD CREC MODE Traverse (MO) adjustment Traverse (CD) adjustment Focus bias adjustment Non-volatile memory control Command transmission Status display Error history display, clear Sled check Access check Outermost circumference check Head position check Same functions as CPLAY MODE Same functions as CREC MODE Initialization of non-volatile memory of adjustment value Auto gain output level adjustment (MO) Auto gain output level adjustment (CD) IOP data display IOP data write Microprocessing version display Continuous play mode Continuous recording mode
Group (*) C: Check S: Service
A: Adjust D: Develop
· For details of each adjustment mode, refer to "5. Electrical Adjustments". For details of "ERR DP MODE", refer to "Self-Diagnosis Function" on page 2. · If a different mode has been selected by mistake, press the MENU/NO button (MD) to exit that mode. · Modes with (X) 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 (MD) to exit the mode immediately. Be especially careful not to set the modes with (!) as they will overwrite the non-volatile memory and reset it, and as a result, the unit will not operate normally.
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 Rotate the l L knob (MD) and display "MD CPLAY MODE". 3 Press the ENTER/YES button (MD) to change the display to "MD CPLAY MID". 4 When access completes, the display changes to "MD C = AD = ". Note : The numbers " " displayed show you error rates and ADER. 2. Changing the parts to be played back 1 Press the ENTER/YES button (MD) during continuous playback to change the display as below. "MD CPLAY MID" t "MD CPLAY OUT" t "MD CPLAY IN" When pressed another time, the parts to be played back can be moved. 2 When access completes, the display changes to "MD C = AD = ". Note : The numbers " " displayed show you error rates and ADER. 3. Ending the continuous playback mode 1 Press the MENU/NO button (MD). The display will change to "MD CPLAY MODE". 2 Press the A button (MD) to remove 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 Rotate the l L knob (MD) and display "MD CREC MODE". 3 Press the ENTER/YES button (MD) to change the display to "MD CREC MID". 4 When access completes, the display changes to "MD CREC ( )". Note : The numbers " " displayed shows you the recording position addresses. 2. Changing the parts to be recorded 1 When the ENTER/YES button (MD) is pressed during continuous recording, the display changes as below. "MD CPLAY MID" t "MD CPLAY OUT" t "MD CPLAY IN" When pressed another time, the parts to be recorded can be changed. 2 When access completes, the display changes to "MD CREC ( )". Note : The numbers " " displayed shows you the recording position addresses. 3. Ending the continuous recording mode 1 Press the MENU/NO button (MD). The display changes to "MD CREC MODE". 2 Press the A button (MD) to remove 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 (MD) 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. 4-5-3. Non-Volatile Memory Mode (EEP MODE) This mode reads and writes the contents of the non-volatile memory. It is not used in servicing. If set accidentally, press the MENU/NO button (MD) immediately to exit it.
20
4-6. FUNCTIONS OF OTHER BUTTONS
Function Contents Sets continuous playback state. playback, the tracking servo turns ON.
H x M m zREC A
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. ON/OFF of recording head arm each time the button is pressed. Ejects the disc
21
SECTION 5 ELECTRICAL ADJUSTMENTS
5-1. PARTS REPLACEMENT AND ADJUSTMENT
· Check and adjust the MDM and MBU as follows. The procedure changes according to the part replaced · Abbreviation OP : Optical pick-up OWH: Overwrite head
· Temperature compensation offset check (5-6-1) · Laser power check (5-6-2) · Traverse check (5-6-3) · Focus bias check (5-6-4) · C PLAY check (5-6-5) · Self-recording/playback check (5-6-6) OK
NG Parts Replacement and Repair
Check the sleding and spindle mechanisms. Other causes can be suspected.
Has the OWH been replaced?
YES
NO
Has OP, IC171, IC101, or IC121 been replaced?
YES Initial setting of the adjustment value NO
Has OP or IC171 been replaced?
NO
YES IOP information recording (IOP value labeled on OP)
Has IC171 or D101 been replaced?
YES Temperature compensation offset adjustment
NO
· Laser power adjustment (5-10) · Traverse adjustment (5-11) · Focus bias adjustment (5-12) · Error rate check (5-13) · Focus bias check (5-14) · Auto gain adjustment (5-15)
22
5-2. PRECAUTIONS FOR CHECKING LASER DIODE EMISSINON
To check the emission of the laser diode during adjustments, never view directly from the top as this may lose your eye-sight.
5-3. PRECAUTIONS FOR USE OF OPTICAL PICKUP (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 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
4) Use the following tools and measuring devices. · Check Disc (MD) TDYS-1 (Parts No. 4-963-646-01) · Test Disk (MDW-74/AGA-1) (Parts No. 4-229-747-01) · Laser power meter LPM-8001 (Parts No. J-2501-046-A) or MD Laser power meter 8010S (Parts No. J-2501-145-A) · Oscilloscope (Measure after performing CAL of prove.) · Digital voltmeter · Thermometer · Jig for checking BD board waveform (Parts No. : J-2501-149-A) 5) When observing several signals on the oscilloscope, etc., make sure that VC and ground do not connect inside the oscilloscope. (VC and ground will become short-circuited.) 6) Using the above jig enables the waveform to be checked without the need to solder. (Refer to Servicing Note on page 6.) 7) As the disc used will affect the adjustment results, make sure that no dusts nor fingerprints are attached to it.
5-5. CREATING CONTINUOUSLY RECORDED DISC
laser tap
Optical pick-up flexible board
5-4. PRECAUTIONS FOR ADJUSTMENTS
1) When replacing the following parts, perform the adjustments and checks with in the order shown in the following table.
Optical Pick-up IC171 1. Initial setting of adjustment value 2. Recording of IOP information (Value written in the pick-up) 3. Temperature compensation offset adjustment 4. Laser power adjustment 5. Traverse adjustment 6. Focus bias adjustment 7. Error rate check 8. Auto gain output level adjustment BD Board D101 IC101, IC121 IC192
* This disc is used in focus bias adjustment and error rate check. The following describes how to create a continuous recording disc. 1. Insert a disc (blank disc) commercially available. 2. Rotate the l L knob and display "MD CREC MODE". 3. Press the ENTER/YES button again to display "MD CREC MID". Display "MD CREC (0300)" and start to recording. 4. Complete recording within 5 minutes. 5. Press the MENU/NO button and stop recording . 6. Press the A button and remove the disc. The above has been how to create a continuous recorded data for the focus bias adjustment and error rate check. Note : · Be careful not to apply vibration during continuous recording.
2) Set the test mode when performing adjustments. After completing the adjustments, exit the test mode. Perform the adjustments and checks in "group S" of the test mode. 3) Perform the adjustments to be needed in the order shown.
23
5-6. CHECKS PRIOR TO REPAIRS
These checks are performed before replacing parts according to "approximate specifications" to determine the faulty locations. For details, refer to "Checks Prior to Parts Replacement and Adjustments" (See page 9). 5-6-1. Temperature Compensation Offset Check When performing adjustments, set the internal temperature and room temperature to 22 to 28ŗC. Checking Procedure: 1. Rotate the l L knob to display "MD TEMP CHECK". 2. Press the ENTER/YES button. 3. "MD T=@@(##) [OK]" should be displayed. If "MD T=@@ (##) [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 the IOP Information.) Connection :
Laser power meter
Note 1: After step 4, each time the ENTER/YES button is pressed, the display will be switched between "MD LD 0.7 mW $ ", "MD LD 0.7 mW $ ", "MD LD 6.2 mW $ ", "MD LD WP $ ", "MD LD 0.9 mW $ ". Nothing needs to be performed here. 5-6-3. Traverse Check Connection :
Oscilloscope
BD board CN110 pin 3 (TE) CN110 pin 1 (VC) V : 0.5 V/div H : 10 ms/div Input : DC mode
Optical pick-up objective lens Digital volt meter
Checking Procedure: 1. Connect an oscilloscope to CN110 pin 3 (TE) and CN110 pin 1 (VC) of the BD board. 2. Load a disc (any available on the market). (Refer to Note 1.) 3. Press the m button and move the optical pick-up outside the pit. 4. Rotate the l L knob and display "MD EF MO CHECK". 5. Press the ENTER/YES button and display "MD EFB = MO-R". (Laser power READ power/Focus servo ON/tracking servo OFF/ spindle (S) servo ON) 6. Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not rotate the l L knob. (Read power traverse checking) (Traverse Waveform)
A VC
BD board CN110 pin 5 (I+3V) CN110 pin 4 (IOP)
Checking Procedure: 1. Set the laser power meter 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 volt meter to CN110 pin 5 (I+3V) and CN110 pin 4 (IOP). 2. Then, rotate the l L knob and display "MD LDPWR CHECK". 3. Press the ENTER/YES button once and display "MD 0.9 mW *** $ ". Check that the reading of the laser power meter become 0.84 to 0.92 mW. (*** means IOP value) 4. Press the ENTER/YES button once more and display "MD 7.0 mW *** $ ". Check that the reading the laser power meter and digital volt meter satisfy the specified value. Specified Value : Laser power meter reading : 7.0 ± 0.2 mW Digital voltmeter reading : Optical pick-up displayed value ± 10% (Optical pick-up label)
KMS 260A 27X40 B0825
B
Specified value : Below 10% offset value Offset value (%) = IA BI X 100 2 (A + B)
7. Press the ENTER/YES button and display "MD EFB = MO-W". 8. Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not rotate the l L knob. (Write power traverse checking) (Traverse Waveform)
A VC B
(For details of the method for checking this value, refer to "5-8. Recording and Displaying the IOP Information".)
Specified value : Below 10% offset value Offset value (%) = IA BI X 100 2 (A + B)
Iop = 82.5 mA in this case Iop (mA) = Digital voltmeter reading (mV)/1 ()
5. Press the MENU/NO button and display "MD LDPWR CHECK" and stop the laser emission. (The MENU/NO button is effective at all times to stop the laser emission.)
T
9. Press the ENTER/YES button display "MD EFB = MO-P". Then, the optical pick-up moves to the pit area automatically and servo is imposed.
24
10. Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not rotate the m button or M button. (Traverse Waveform)
A VC B
Specified value : Below 10% offset value Offset value (%) = IA BI X 100 2 (A + B)
11. Press the ENTER/YES button display "MD EF MO CHECK" The disc stops rotating automatically. 12. Press the A button and remove the disc. 13. Load the check disc (MD) TDYS-1. 14. Roteto the l L knob and display "MD EF CD CHECK". 15. Press the ENTER/YES button and display "MD EFB = CD". Servo is imposed automatically. 16. Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not rotate the m button or M button. (Traverse Waveform)
5-6-4. Focus Bias Check Change the focus bias and check the focus tolerance amount. Checking Procedure : 1. Load a test disk (MDW-74/GA-1). 2. Rotate the l L knob and display "MD CPLAY MODE". 3. Press the ENTER/YES button twice and display "MD CPLAY MID". AD = " is 4. Press the MENU/NO button when "MD C = displayed. 5. Rotate the l L knob and display "FBIAS CHECK". 6. Press the ENTER/YES button and display "MD / 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 220 and ADER is below 2. 7. Press the ENTER/YES button and display "MD / b= ". Check that the C1 error is below 220 and ADER is below 2. 8. Press the ENTER/YES button and display "MD / a= ". Check that the C1 error is below 220 and ADER is below 2. 9. Press the MENU/NO button, next press the A button, and remove the test disc. 5-6-5. C PLAY Check MO Error Rate Check Checking Procedure : 1. Load a test disk (MDW-74/GA-1). 2. Rotate the l L knob and display "MD CPLAY MODE". 3. Press the ENTER/YES button and display "MD CPLAY MID". AD = ". 4. The display changes to "MD C1 = 5. If the C1 error rate is below 80, check that ADER is below 2. 6. Press the MENU/NO button, stop playback, press the A button, and test disc. CD Error Rate Check Checking Procedure : 1. Load a check disc (MD) TDYS-1. 2. Rotate the l L knob and display "MD CPLAY MODE". 3. Press the ENTER/YES button twice and display "MD CPLAY MID". 4. The display changes to "MD C1 = AD = ". 5. Check that the C1 error rate is below 50. 6. Press the MENU/NO button, stop playback, press the A button, and the test disc. 5-6-6. Self-Recording/playback Check Prepare a continuous recording disc using the unit to be repaired and check the error rate. Checking Procedure : 1. Insert a recordable disc (blank disc) into the unit. 2. Rotate the l L knob to display "MD CREC MODE". 3. Press the ENTER/YES button to display the "MD CREC MID". 4. When recording starts, this becomes "MD CREC (@@@@)" (@@@@ is the address), and recording starts. 5. About 1 minute later, press the MENU/NO button to stop continuous recording. 6. Rotate the l L knob to display "MD CPLAY MODE". 7. Press the ENTER/YES button to display "MD CPLAY MID". 8. "MD C1 = AD = " will be displayed. 9. Check that the C1 error becomes below 80 and the AD error below 2. 10. Press the MENU/NO button to stop playback, and press the A button and remove the disc.
A VC B
Specified value : Below 10% offset value Offset value (%) = IA BI X 100 2 (A + B)
17. Press the ENTER/YES button and display "MD EF CD CHECK". 18. Press the A button and remove the check disc (MD) TDYS-1. Note 1 : MO reading data will be erased during if a recorded disc is used in this adjustment. Note 2 : If the traverse waveform is not clear, connect the oscilloscope as shown in the following figure so that it can be seen more clearly.
Oscilloscope
BD board CN110 pin 3 (TE) CN110 pin 1 (VC)
330 k 10pF
25
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. Rotate the l L knob to display "MD ADJ CLEAR". 2. Press the ENTER/YES button. "Complete!!" will be displayed momentarily and initial setting will be executed, after which "MD ADJ CLEAR" will be displayed.
5-9. TEMPERATURE COMPENSATION OFFSET ADJUTMENT
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. Adjusting Procedure : 1. Rotate the l L knob and display "MD TEMP ADJUST". 2. Press the ENTER/YES button and select the "MD TEMP ADJUST" mode. 3. "MD TEMP = [OK]" and the current temperature data will be displayed. 4. To save the data, press the ENTER/YES button. When not saving the data, press the MENU/NO button. 5. When the ENTER/YES button is pressed, "MD TEMP = SAVE" will be displayed and turned back to "MD TEMP ADJUST" display then. When the MENU/NO button is pressed, "MD TEMP ADJUST" will be displayed immediatelly. Specified Value : The "MD TEMP = " should be within "E0 - EF", "F0 - FF", "00 - 0F", "10 - 1F" and "20 - 2F".
5-8. RECORDING AND DISPLAYING THE IOP INFORMATION
The IOP data can be recorded in the non-volatile memory. The IOP value on the label of the optical pick-up 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. When the power OFF (STANDBY), press the ?/1 button (TA) while pressing the s button and ENTER/YES button together. 2. Press the MENU/NO button, and when "Check" is displayed. 3. Rotate the l L knob to display "MD [Service]", and press the ENTER/YES button. 4. Rotate the l L knob to display "MD Iop Write", and press the ENTER/YES button. 5. The display becomes Ref=@@@.@ (@ is an arbitrary number) and the numbers which can be changed will blink. 6. Input the IOP value written on the optical pick-up. To select the number : Rotate the l L knob. To select the digit : Press the SYNCHRO REC button. 7. When the ENTER/YES button is pressed, the display becomes "MD Measu=@@@.@" (@ is an arbitrary number). 8. As the adjustment results are recorded for the 7 value. Leave it as it is and press the ENTER/YES button. 9. "Complete!!" will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become "MD Iop Write". Display Procedure : 1. Rotate the l L knob to display "MD Iop Read". 2. "MD @@.@/##.#" is displayed and the recorded contents are displayed. @@.@ indicates the IOP value labeled on the pick-up. ##.# indicates the IOP value after adjustment 3. To end, press the l L button or MENU/NO button to display "MD Iop Read".
5-10. LASER POWER ADJUSTMENT
Check the IOP value of the optical pick-up before adjustments. (Refer to 5-8. Recording and Displaying the IOP Information.) Connection :
Laser power meter
Optical pick-up objective lens Digital volt meter
BD board CN110 pin 5 (I+3V) CN110 pin 4 (IOP)
Adjusting Procedure : 1. Set the laser power meter 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 volt meter to CN110 pin 5 (I+3V) and CN110 pin 4 (IOP). 2. Rotate the l L knob and display "MD LDPWR ADJUST". (Laser power : For adjustment) 3. Press the ENTER/YES button once and display "MD LD 0.9 mW $ ". 4. Rotate the l L knob so that the reading of the laser power meter becomes 0.85 to 0.91 mW. Press the ENTER/YES button after setting the range knob of the laser power meter, and save the adjustment results. ("MD LD SAVE $ " will be displayed for a moment.)
26
5. Then "MD LD 7.0 mW $ " will be displayed. 6. Rotate the l L knob so that the reading of the laser power meter becomes 6.9 to 7.1 mW, press the ENTER/YES button and save it. Note : Do not perform the emission with 7.0 mW more than 15 seconds continuously. 7. Then, rotate the l L knob and display "MD LDPWR CHECK". 8. Press the ENTER/YES button once and display "MD 0.9 mW *** $ ". Check that the reading of the laser power meter become 0.85 to 0.91 mW. (*** means the IOP value) 9. Press the ENTER/YES button once more and display "MD 7.0 mW *** $ ". Check that the reading the laser power meter and digital volt meter satisfy the specified value. Note down the digital voltmeter reading value. Specified Value : Laser power meter reading : 7.0 ± 0.1 mW Digital voltmeter reading : Optical pick-up displayed value ± 10% (Optical pick-up label)
KMS
5-11. TRAVERSE ADJUSTMENT
Connection :
Oscilloscope
BD board CN110 pin 3 (TE) CN110 pin 1 (VC) V : 0.5 V/div H : 10 ms/div Input : DC mode
260A 27X40 B0825
(For details of the method for checking this value, refer to "5-8. Recording and Displaying the IOP Information".)
IOP = 82.5 mA in this case IOP (mA) = Digital voltmeter reading (mV)/1 ()
10. Press the MENU/NO button and display "MD LDPWR CHECK" and stop the laser emission. (The MENU/NO button is effective at all times to stop the laser emission.) 11. Rotate the l L knob to display "MD Iop Write". 12. Press the ENTER/YES button. When the display becomes Ref=@@@.@ (@ is an arbitrary number), press the ENTER/ YES button to display "MD Measu=@@@.@" (@ 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 : Rotate the l L knob. To select the digit : Press the SYNCHRO REC button. Selection of digit : Press the SYNCHRO REC button. 14. When the ENTER/YES button is pressed, "Complete!" will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become "MD Iop Write". Note 1: After step 4, each time the ENTER/YES button is pressed, the display will be switched between "MD 0.7 mW *** $ ", "MD 6.2 mW *** $ ", and "MD Wp *** $ ". Nothing needs to be performed here.
Adjusting Procedure : 1. Connect an oscilloscope to CN110 pin 3 (TE) and CN110 pin 1 (VC) of the BD board. 2. Load a disc (any available on the market). (Refer to Note 1.) 3. Press the M button and move the optical pick-up outside the pit. 4. Rotate the l L knob and display "MD EF MO ADJUST". 5. Press the ENTER/YES button and display "MD EFB = MO-R". (Laser power READ power/Focus servo ON/tracking servo OFF/ spindle (S) servo ON) 6. Rotate the l L knob so that the waveform of the oscilloscope becomes the specified value. (When the l L knob is rotated, the of "MD EFB= " 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. (Read power traverse adjustment) (Traverse Waveform)
A VC B
T
Specification A = B
7. Press the ENTER/YES button and save the result of adjustment to the non-volatile memory ("MD EFB = SAVE" will be displayed for a moment. Then "MD EFB = MO-W" will be displayed). 8. Rotate the l L knob so that the waveform of the oscilloscope becomes the specified value. (When the l L knob is rotated, the of "MD EFB- " 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. (Write power traverse adjustment) (Traverse Waveform)
A VC B
Specification A = B
27
9. Press the ENTER/YES button, and save the adjustment results SAVE" will be in the non-volatile memory. ("MD EFB = displayed for a moment.) MO-P". will be displayed. 10. "MD EFB = The optical pick-up moves to the pit area automatically and servo is imposed. 11. Rotate the l 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. (Traverse Waveform)
A VC B
5-12. FOCUS BIAS ADJUSTMENT
Adjusting Procedure : 1. Load a test disk (MDW-74/GA-1). 2. Rotate the l L knob and display "MD CPLAY MODE". 3. Press the ENTER/YES button and display "MD CPLAY MID". AD = " 4. Press the MENU/NO button when "MD C1 = is displayed. 5. Rotate the l L knob and display "MD FBIAS ADJUST". 6. Press the ENTER/YES button and display "MD / 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. Rotate the l L knob in the clockwise direction and find the focus bias value at which the C1 error rate becomes 220 (Refer to Note 2). 8. Press the ENTER/YES button and display "MD / b= ". 9. Rotate the l L knob in the counterclockwise direction and find the focus bias value at which the C1 error rate becomes 220. 10. Press the ENTER/YES button and display "MD / c= ". 11. Check that the C1 error rate is below 50 and ADER is 00. Then press the ENTER/YES button. 12. If the "( " in " - - ( " is above 20, press the ENTER/ YES button. If below 20, press the MENU/NO button and repeat the adjustment from step 2. 13. Press the A button to remove the test 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 vale.
C1 error 220
Specification A = B
12. Press the ENTER/YES button, and save the adjustment results SAVE" will be in the non-volatile memory. ("MD EFB = displayed for a moment.) Next "MD EF MO ADJUST" is displayed. The disc stops rotating automatically. 13. Press the A button and remove the disc. 14. Load the check disc (MD) TDYS-1. 15. Roteto l L knob and display "MD EF CD ADJUST". 16. Press the ENTER/YES button and display "MD EFB = CD". Servo is imposed automatically. 17. Rotate the l 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
b
c
a
Focus bias value (F. BIAS)
18. Press the ENTER/YES button, display "MD EFB = SAVE" for a moment and save the adjustment results in the non-volatile memory. Next "MD EF CD ADJUST" will be displayed. 19. Press the A button and remove the check disc (MD) TDYS-1. Note 1 : MO reading data will be erased during if a recorded disc is used in this adjustment. Note 2 : If the traverse waveform is not clear, connect the oscilloscope as shown in the following figure so that it can be seen more clearly.
Oscilloscope
BD board CN110 pin 3 (TE) CN110 pin 1 (VC)
330 k 10pF
28
5-13. ERROR RATE CHECK
5-13-1. CD Error Rate Check Checking Procedure : 1. Load a check disc (MD) TDYS-1. 2. Rotate the l L knob and display "MD CPLAY MODE". 3. Press the ENTER/YES button twice and display "MD CPLAY MID". AD = ". 4. The display changes to "MD C1 = 5. Check that the C1 error rate is below 20. 6. Press the MENU/NO button, stop playback, press the A button, and remove the test disc. 5-13-2. MO Error Rate Check Checking Procedure : 1. Load a test disc (MDW-74/GA-1). 2. Rotate the l L knob and display "MD CPLAY MODE". 3. Press the ENTER/YES button and display "MD CPLAY MID". 4. The display changes to "MD C1 = AD = ". 5. If the C1 error rate is below 50, check that ADER is 00. 6. Press the MENU/NO button, stop playback, press the A button, and remove the test disc.
5-15. AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT
Be sure to perform this adjustment when the pick-up is replaced. If the adjustment results becomes "Adjust NG!", the pick-up may be faulty or the servo system circuits may be abnormal. 5-15-1. CD Auto Gain Control Output Level Adjustment Adjusting Procedure : 1. Insert the check disc (MD) TDYS-1. 2. Rotate the l L knob to display "MD AG Set (CD)". 3. When the ENTER/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 "MD AG Set (CD)". 4. Press the A button to remove the disc. 5-15-2. MO Auto Gain Control Output Level Adjustment Adjusting Procedure : 1. Insert the reference disc (MDW-74/GA-1) for recording. 2. Rotate the l L knob to display "MD AG Set (MO)". 3. When the ENTER/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 "MD AG Set (MO)". 4. Press the A button to remove the disc.
5-14. FOCUS BIAS CHECK
Change the focus bias and check the focus tolerance amount. Checking Procedure : 1. Load a test disc (MDW-74/GA-1). 2. Rotate the l L knob and display "MD CPLAY MODE". 3. Press the ENTER/YES button twice and display "MD CPLAY MID". 4. Press the MENU/NO button when "MD C1 = AD = " is displayed. 5. Rotate the l L knob and display "MD FBIAS CHECK". 6. Press the ENTER/YES button and display "MD / 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 50 and ADER is below 2. 7. Press the ENTER/YES button and display "MD / b= ". Check that the C1 error is below 220 and ADER is below 2. / a= 8. Press the ENTER/YES button and display "MD ". Check that the C1 error is below 220 and ADER is below 2 9. Press the MENU/NO button, next press the A button, and remove the continuously recorded disc. Note 1 : If the C1 error 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. Adjust perform the beginning again.
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5-16. ADJUSTING POINTS AND CONNECTING POINTS
[BD BOARD] (SIDE A)
CN101 D101
CN110
GND I+3V IOP TE RF VC
NOTE
IC171
[BD BOARD] (SIDE B)
IC101
IC121
IC192
NOTE: It is useful to use the jig. for checking the waveform. (Refer to Servicing Note on page 7.)
30
SECTION 6 DIAGRAMS
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.) For schematic diagrams.
Note: · All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums. · All resistors are in and 1/4 W or less unless otherwise specified. f · : internal component. · C : panel designation. Note: The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified. · U : B+ Line. · V : B Line. · H : adjustment for repair. no mark : STOP ( ) : Play the test disc (TDYS-1) < > : REC : Can not be measured. · Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances. · Waveforms are taken with a oscilloscope. Voltage variations may be noted due to normal production tolerances. · Circled numbers refer to waveforms. · Signal path. E : PB j : REC p : PB (DIGITAL) l : REC (DIGITAL)
· Indication of transistor
C Q B E These are omitted
WAVEFORMS BD (1/2) SECTION
MAIN SECTION
1 IC101 ek RF PLAY MODE
1 IC701 qd (XOUT)
3.2Vp-p
100nsec 1µsec/div 1.2Vp-p
BC E These are omitted
2 IC101 wh
TE PLAY MODE
2 IC601 0 (SYSCLK)
1.7Vp-p 44.3nsec approx 1.5Vp-p
3 IC101 ef
FE PLAY MODE
approx 400mVp-p
BD (2/2) SECTION
4 IC121 qh (OSCI)
3.0Vp-p 44.3nsec
5 IC121 wj (LRCK)
For printed wiring boards.
Note: · X : parts extracted from the component side. · Y : parts extracted from the conductor side. a · : Through hole. · b : Pattern from the side which enables seeing. (The other layers' patterns are not indicated.) Caution: Pattern face side: (Side B) Parts face side: (Side A)
3.2Vp-p
22.7µsec
6 IC121 wk (XBCK)
3.8Vp-p 354nsec
Parts on the pattern face side seen from the pattern face are indicated. Parts on the parts face side seen from the parts face are indicated.
7 IC121 wl (FS256)
3.8Vp-p 88.6nsec
8 IC121 o; (FS4)
3.2Vp-p 5.67µsec
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31
MDS-SP55
6-1. BLOCK DIAGRAMS BD SECTION
OVER WRITE HEAD DRIVE IC181
DIGITAL SERVO SIGNAL PROCESSOR, DIGITAL SIGNAL PROCESSOR EFM/ACIRC ENCODER/DECODER, SHOCK-PROOF MEMORY CONTROLLER, ATRAC ENCODER/DECODER IC121
XINIT
FILTER
· R-ch is omitted. · Signal path : PB : REC : PB (Digital) : REC (Digital)
HEAD DRIVE Q181,182
8 · 11
TX
HR901 OVER WRITE HEAD
9 · 12 10 · 13 4 5
15
14 DIN0 DIN1 ADDT 19 20 25 D-IN.0 D-IN.1 ADDT
3
1 2
100
EFMO
6
48 47 46 40
RF AMP IC101
59 60 61 62
PCO FILI FILO CLTV
PLL
EFM, ACIRC, ENCODER/ DECODER
SHOCK RESISTANT MEMORY CONTROLLER
ATRAC ENCODER/ DECODER
DIGITAL AUDIO I/F
A
DADT 26 21 28 27 16 7 BUFFER IC123 3 DADT D-OUT BCK LRCK 512FS SCTX XINT SQSY DQSY MNT3 MNT2 MNT1 MNT0 SENS SRDT SCLK SWDT XLAT CH DRAM IC124 XWE 47 XRAS 46 XCAS 44 XOE 43 3 4 17 16 1 · 2 · 18 · 19 6 9 · 11 15 · 5 XWE XRAS XCAS XOE DQ1
MORFO MORFI RFO AGCI
OPTICAL PICK-UP BLOCK (KMS-260B