Sony HCD-MD373 User Manual

HCD-MD373

SERVICE MANUAL

Ver 1.1 2001.06

HCD-MD373 is the amplifir, CD, MD and tuner section in DHC-MD373.

Model Name Using Similar Mechanism NEW

SECTION

Mechanism Type CDM55A-5SBD32, CDM55C-5BD32 Base Unit Type BU-5SBD32, BU-5BD32 Optical Pick-up Type KSS-213BA/F-NP Model Name Using Similar Mechanism MDS-JE520 Mechanism Type MDM-5A Optical Pick-up Type KMS-260B/J1N

AEP Model

UK Model

E Model

Australian Model

Chinese Model

Tourist Model

SPECIFICATIONS

COMPACT DISC DECK RECEIVER

— Continued on next page —

9-928-998-12

Sony Corporation

Home Audio Company

Shinagawa Tec Service Manual Production Group

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)”.

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 “R” button to exit the mode.

1. When the power ON, press the 1/u button while pressing the p (MD) button and r REC button together.

2. Press the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button and when “[Service]” is displayed, press the ENTER/YES “R” button. (If nothing is displayed, press the FUNCTION button and set the function to “MD”.)

3. Press the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button and display “ERR DP MODE”.

4. Pressing the ENTER/YES “R” button sets the error history mode and displays “total rec”.

5. Select the contents to be displayed or executed using the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button.

6. Pressing the SYNC REC button will display or execute the contents selected.

7. Pressing the SYNC REC button another time returns to step 4.

8. Pressing the MENU/NO “R” button displays “ERROR DP MODE” and exits the error history mode.

9. To exit the test mode, press the REPEAT/STEREO/MONO button. The unit sets into the STANDBY state, and the test mode ends.

Note 1: About “R” As this unit has only a few buttons, some operations require the use of remote commander (RM-SJ373/provided with unit: 1-418-554-11) buttons. These operations are indicated as “R” in this manual. Example: MENU/NO “R” ...Press the MENU/NO button of the remote commander.

Note 2:

Incorrect operations may be performed if the test mode is not set properly. In this case, press the RESET button of the back panel.

ITEMS OF ERROR HISTORY MODE ITEMS AND CONTENTS

Selecting the Test Mode

Display

total rec

total play

retry err

total err

err history

Details of History

Displays the recording time. Displayed as “rππππππh”. 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 “pππππππh”. 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 “rππ pππ”. “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 ππ”. The number of errors is displayed in hexadecimal digits from 00 to FF.

Displays the 10 latest errors. Displayed as “0π E@@”. π 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 pressing the =0/MD/CD/ TUNING – button or )+/MD/CD/TUNING + button.

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)

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 SYNC REC button and “er refresh?” is displayed, press the ENTER/YES “R” button 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 pickup. If the optical pickup has been replaced, perform this operation and erase the history. After pressing the SYNC REC button and “tm refresh?” is displayed, press the ENTER/YES “R” button 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.

Details of Error

Error Code

E05 E06 E07 E08 E09

E0A

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)

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.

MODEL IDENTIFICATION — BACK PANEL —

Parts No.

P ARTS No. MODEL

4-221-082-1π AEP, UK 4-221-082-3π HK, SP, MY, AR, AUS, KR, JE 4-221-082-4π CH

• Abbreviation HK : Hong Kong model SP : Singapore model MY : Malaysia model AR : Argentine model AUS : Australian model KR : Korea model CH : Chinese model JE : Tourist model

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 ! OR DO TTED LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

Ver 1.1 2001.06

1. SERVICING NOTE .......................................................... 6

2. GENERAL ........................................................................ 16

3. DISASSEMBLY

3-1. Case ................................................................................... 19

3-2. Front Panel ......................................................................... 20

3-3. Back Panel ......................................................................... 20

3-4. Main Board and Power Transformer ................................. 21

3-5. CD Mechanism Deck ......................................................... 21

3-6. Tray, Gear and Cam ........................................................... 22

3-7. CD Base Unit ..................................................................... 22

3-8. Optical Pick-up Section of CD (KSS-213BA/F-NP) .........22

3-9. BD (CD) Board, Spindle Motor (M101) and

Sled Motor (M102) ............................................................ 23

3-10.MD Mechanism Deck ........................................................ 23

3-11.Slider (Cam) ...................................................................... 24

3-12.Base Unit (MBU-5A) and BD (MD) Board ...................... 24

3-13.Over Write Head ................................................................ 25

3-14.Optical Pick-up of MD (KMS-260B/J1N) ........................ 25

3-15.Spindle Motor (M901) and SLed Motor (M902) (MD) .... 25

4. TEST MODE ..................................................................... 26

5. ELECTRICAL ADJUSTMENTS ............................... 31

6. DIAGRAMS

6-1. Circuit Boards Location ..................................................... 40

6-2. Block Diagrams

• BD (CD) Section ............................................................ 41

• BD (MD) Section (1/2) ................................................... 42

• BD (MD) Section (2/2) ................................................... 43

• Main Section ................................................................... 44

6-3. Printed Wiring Board – BD (CD) Section – ...................... 46

6-4. Schematic Diagram – BD (CD) Section – ......................... 47

6-5. Printed Wiring Board – BD (MD) Section – ..................... 48

6-6. Schematic Diagram – BD (MD) Section – (1/2) ............... 49

6-7. Schematic Diagram – BD (MD) Section – (2/2) ............... 50

6-8. Schematic Diagram – SP Section – ................................... 51

6-9. Printed Wiring Board – SP Section – ................................ 51

6-10.Printed Wiring Board – Main Section – ............................ 52

6-11.Schematic Diagram – Main Section – (1/3) ...................... 53

6-12.Schematic Diagram – Main Section – (2/3) ...................... 54

6-13.Schematic Diagram – Main Section – (3/3) ...................... 55

6-14.Schematic Diagram – MD Digital Section – ..................... 56

6-15.Printed Wiring Board – MD Digital Section – .................. 57

6-16.Schematic Diagram – AMP Section – ............................... 58

6-17.Printed Wiring Board – AMP Section – ............................ 59

6-18.Schematic Diagram – Panel Section – ............................... 60

6-19.Printed Wiring Board – Panel Section – ............................ 61

6-20.Schematic Diagram – Power Section – ............................. 62

6-21.Printed Wiring Board – Power Section – ........................... 63

6-22.Schematic Diagram – BD Switch Section – ...................... 64

6-23.Printed Wiring Board – BD Swtich Section – ................... 64

6-24.Schematic Diagram – Loading Section – .......................... 64

6-25.Printed Wiring Board – Loading Section –........................ 64

6-26.IC Block Diagrams ............................................................ 65

6-27.IC Pin Functions ................................................................ 69

7. EXPLODED VIEWS

7-1. Case and Front Panel Section ............................................ 77

7-2. Chassis Section .................................................................. 78

7-3. MD Mechanism Section (MDM-5A) ................................ 79

7-4. MD Base Unit Section (MBU-5A) .................................... 80

7-5. CD Mechanism Section (CDM55A-5SBD32)................... 81

7-6. CD Base Unit Section (BU-5SBD32) ............................... 82

7-7. CD Mechanism Section (CDM55C-5BD32) ..................... 83

7-8. CD Base Unit Section (BU-5BD32) .................................. 84

8. ELECTRICAL PARTS LIST ........................................ 85

SECTION 1

SERVICING NOTE

Note 1: “R” As this unit has only a few buttons, some operations require the use of remote commander (provided with RM-SJ373/unit: 1-418-554-11) buttons. These operations are indicated as “R” in this manual. Example: MENU/NO “R” ...Press the MENU/NO button of the remote commander.

DRAWING OUT THE TRAY DURING POWER OFF

Tray (CDM)

Move the Cam block in the direction of arrow with a finger.

REMOVING THE INDICATION PLATE (FL)

Note: Follow the disassembly procedure in the numerical order given.

• Press the of the front panel from the rear and remove the 7 indication plate (FL).

Indication plate (FL)

Nut

Knob (VOL)

CLEANING THE OPTICAL PICKUP (CD PLAYER)

CD mechanism deck

Panel board

Filter (FL)

Ring (VOL)

(Remove the two claws from the Front panel back side.)

Floating screw

(BVTP 3x10)

Six screws

Optical pick-up block

Clean the lens block with applicator.

CD mechanism deck

SERVICE POSITION THE MD MECHANISM

MD mechanism deck

SERVICE POSITION THE CD MECHANISM

SERVICE POSITION THE POWER BOARD

Power board

Main board

CN993

Amp board

CN802

Extension cable (4P) (J-2501-042-A)

Extension cable (3P) (J-2501-045-A)

Cold Reset

• The cold reset clears all data inculuding preset data stored in the RAM to initial conditions. Execute this mode when returning the set to the customer.

Procedure 1: (recommended) Press the RESET button on the back panel.

Procedure 2:

1. When the power ON, press the 1/u button while pressing the PLAY MODE/TUNING MODE button and p (CD) buttons 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/u button while pressing the PLAY MODE/TUNING MODE button and ^ (CD) buttons together.

2. Turn off the unit and reset is executed.

LED and Fluorescent Indicator Tube All Lit, Key Check Mode

Procedure :

1. When the power ON, press the 1/u button while pressing the PLAY MODE/TUNING MODE button and 6 (CD) buttons together.

2. LEDs and fluorescent indicator tube are all turned on.

3. Press ^ (MD) button to turn set on.

4. 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 in the clockwise direction, or decreases like “0, 9, 8 ...” if rotating in the counterclockwise diretion.

5. To exit from this mode, press three buttons in the same procedure as step 1, or disconnect the power cord.

Note:

Press the =0/MD/CD/TUNING– button or )+/MD/CD/TUNING+ button for more than 1 second.

Change-over of AM tuner Step between 9kHz and 10kHz.

• A step of AM channels can be changed over between 9kHz and 10kHz.

1. Press 1/u button to turn set on.

2. Select the function “TUNER”, and press TUNER/BAND button to select the BAND “AM”.

3. Press 1/u button to turn on the set OFF.

4. When the power OFF, press 1/u button while pressing the PLAY MODE/TUNING MODE button.

The display of fluorescent indicator tube changes to “AM 9k STEP” or “AM 10k STEP”, and thus the channel step is changed over.

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. Donot suspect a fault in this case.

Aging Mode

• Mode for repeating operations of the CD player automatically.

When errors occur:

Aging stops and a message indicating that an error has occurred such as “CD MEC ERR” is displayed. (For details of errors, refer to “Error History Display Mode”.)

When no errors occur:

Aging is repeatedly performed.

Procedure:

1. Load any CD.

2. Press the FUNCTION button and set the function to CD.

3. While pressing the PLAY MODE/TUNING MODE button and ^ (MD) button, press the 1/u button.

4. “AGING” is displayed on the fluorescent display tube briefly.

5. When the aging mode is set, the CD mark and MD mark on the fluorescent tube blink.

6. Pressing the ^ (CD) button starts aging. Operations are performed in the following sequence during aging.

Reading of TOC

Playback of first track

Playback of last track

CD tray open

CD tray close

7. To end aging, while pressing the PLAY MODE/TUNING MODE button and ^ (CD) button, press the 1/u button. (Hot reset is executed.)

Error History Display Mode

Mode for checking the history of errors which have occurred in the CD player. Execute this mode after ending the aging mode.

Procedure:

1. Press the FUNCTION button, and set the function to “CD”.

2. While pressing the p (MD) button and )+/MD/CD/TUNING+ button, press the 1/u button.

3. “EMC@@EDC**” id displayed. @@ : Number of mechanism errors (Past 3 errors) ** : Number of errors (NO DISC ERROR) which occurred after chucking (Past 3 errors)

4. T o check the history of mechanism errors, press the PLA Y MODE/TUNING MODE button, and to check BD errors, press the REPEAT/ STEREO/MONO button, and switch the display.

5. To end, press the 1/u button and turn OFF the power.

6. To erase the error history, perform COLD reset. (While pressing the PLAY MODE/TUNING MODE button and p (CD) button, press the 1/u button.)

• Reading the Mechanism Error History Display

(To switch the history, press the PLAY MODE/TUNING MODE button.)

Display E@@M**#*$*

@@: Error number. 00 is the latest *: Invalid #: Load in operations related

D: Operations stopped due to problems other than mechanism related during CLOSE E: Operations stopped due to problems other than mechanism related during OPEN C: Operations stopped due to problems other than mechanism related during chucking up

$: Load out operations related

1: Operations stopped during chucking up 2: Operations stopped during chucking down

• Reading the BD Error History Display

(To switch the history, press the REPEAT/STEREO/MONO button.)

Display E@@D##SS%*

@@: Error number. 00 is the latest ##: Error details

01: Focus error 02: GFS error 03: Setup error

$$: Retry performed/not performed

00: Determined as NO DISC without chucking retry 02: Determined as NO DISC after chucking retry

%: State when determined as NO DISC

1: When stopped 2: During setup 3: During TOC READ 4: During access 5: During playback 6: During PAUSE 7: During manual search (during playback) 8: During manual search (during Pause)

*: Invalid

JIG FOR CHECKING BD (MD) BOARD WAVEFORM

The special jig (J-2501-149-A) is useful for checking the waveform of the BD (MD) 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)

Mechanism deck

TEO

IOP

I+3V

GND

TEO

CN110

6P connecto

5P connector

RF VC TEO For MDMIOP I+3V

IOP

I+3V

GND

VC RF TEO

For MDM-5

IOP I+3V

GND

IOP DATA RECORDING AND DISPLAY WHEN OPTICAL PICK-UP AND NON-V OLATILE MEMORY (IC171 OF BD (MD) 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 (MD) board), record the IOP value on the optical pick-up according to the following procedure.

Record Precedure:

1. When the power ON, press the 1/u button while pressing the p (MD) button and r (REC) button together.

2. Press the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button to display “[Service]”, and press the ENTER/ YES “R” button.

3. Press the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button to display “ lop. Write”, and press the ENTER/ YES “R” button.

4. The display becomes “Ref=@@@.@” (@ is an arbitrary number) and the numbers which can be changed will blink.

5. Input the IOP value written on the optical pick-up. To select the number :Press the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button. To select the digit : Press the SYNC REC button.

6. When the ENTER/YES “R” button is pressed, the display becomes “Measu=@@@.@” (@ is an arbitrary number).

7. As the adjustment results are recorded for the 6 value. Leave it as it is and press the ENTER/YES “R” 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 REPEAT STEREO/MONO button to complete. “Standby” will be displayed.

Display Precedure:

1. When the power ON, press the 1/u button while pressing the p (MD) button and r (REC) button together.

2. Press the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button to display “[Service]”, and press the ENTER/ YES “R” button.

3. Press the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button to display “lop.Read”.

4. “@@.@/##.#” is displayed and the recorded contents are displayed. @@.@ : indicates the Iop value labeled on the pick-up. ##.# : indicates the Iop value after adjustment

5. To end, press the SYNC REC button or MENU/NO “R” button to display “Iop Read”. Then press the REPEAT STEREO/MONO button to display “Standby”.

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”.

Laser power check (5-6-2 : See page 33)

Traverse check (5-6-3 : See page 33) Focus bias check (5-6-4 : See page 34)

C PLAY check (5-6-5 : See page 34)

Self-recording/playback check (REC/PLAY) (5-6-6 : See page 34)

TEMP check (Temperature compensation offset check) (5-6-1 : See page 33)

Criteria for Determination (Unsatisfactory if specified value is not satisfied)

• 0.9 mW power Specified value : 0.84 to 0.92 mW

• 7.0 mW power Specified value : 6.8 to 7.2 mW lop (at 7mW)

• Labeled on the optical pickup Iop value ± 10mA

• 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/AU-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

• Unsatisfactory if displayed as T=@@ (##) [NG]” NG (@@, ## are both arbitrary numbers)

Measure if unsatisfactory:

• Clean the optical pick-up

• Adjust again

• Replace the optical pick-up

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 :

Press the S101 ( RESET button of the back panel) on the MAIN board.

[MAIN BOARD] (Component Side)

SET REAR PANEL

S101

RESET button

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.

Precedure:

1. Load a recordable disc whose contents can be erased into the unit.

2. Press the MENU/NO “R” button. When “Edit/Menu” is displayed on the fluorescent indicator tube, press the =0/MD/CD/

TUNING – button or )+/MD/CD/TUNING + button to display “All Erase?”.

3. Press the ENTER/YES “R” button.

4. When “All Erase??” is displayed on the fluorescent indicator tube, the music calendar number blinks.

5. Press the ENTER/YES “R” button to display “Complete!!”, and press the p (MD) button immediately. W ait for about 10 seconds while

pressing the button.

6. When the “TOC” displayed on the fluorescent display tube goes off, release the p (MD) button.

7. Press the r REC button to start recording. Then press the ^ (MD) button and start recording. If recording cannot be performed, press

the FUNCTION button and set a different section.

8. To check the “track mode”, press the ^ (MD) button to start play.

9. To exit the test mode, press the 1/u button, and turn OFF the power. When “T OC” disappears, disconnect the power plug from the outlet.

If the test mode cannot be exited, refer to “Forced Reset” on page 8.

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

Lower Bits

Hexadecimal

Bit

Binary

Higher Bits

84218421

b7 b6 b5 b4 b3 b2 b1 b0

00000001

00000010

00000100 00001000 00010000 00100000 01000000 10000000

Hexa-

decimal

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 ** : Sector $$ : Track mode (Track information such as copyright infor-

Reading the Retry Cause Display

Cause of Retry Occurring conditions

shock

ader5

Discontinuous address DIN unlock FCS incorrect IVR rec error CLV unlock Access fault

} Address (Physical address on disc)

mation of each part)

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

Reading the 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 n b6 Lower bit : 2 = 0010 n b1 In this case, the retry cause is combined of “CLV unlock” and “ader5”.

When A2 is displayed: Higher bit : A = 1010 n b7+b5 Lower bit : 2 = 0010 n b2 The retry cause in this case is combined of “access fault”, “IVR rec error”, and “ader5”.

Reading the Track Mode Display

Higher Bits Lower Bits

Hexadecimal

Bit

Binary

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 n b7 Lower bit : 4 = 0100 n 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 n All 0 Lower bit : 7 = 0111 n 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”.

84218421

b7 b6 b5 b4 b3 b2 b1 b0

00000001 00000010 00000100 00001000 00010000 00100000 01000000 10000000

Hexa-

decimal

01 02 04 08 10 20 40 80

When 0 When 1

Emphasis OFF Monaural This is 2-bit display. Normally 01. 01:Normal audio. Others:Invalid Audio (Normal) Original Copyright Write prohibited

Details

Emphasis ON Stereo

Invalid Digital copy No copyright Write allowed

Hexadecimal n Binary Conversion Table

Hexadecimal Binary Hexadecimal Binary

0 1 2 3 4 5 6 7

0000 0001 0010 0011 0100 0101 0110 0111

9 A B C D E

1000 1001 1010 1011 1100 1101 1110 1111

Front Panel

SECTION 2

GENERAL

21 20

18 17 16

9 10

LOCATION OF PARTS AND CONTROLS

1 1/u (power) switch 2 MD slot 3 6 (Eject) (MD) button 4 MD indicator 5 (P (MD) button 6 p (MD) button 7 VOLUME (CD) knob 8 (P (CD) button 9 p (CD) button 10 TUNER/BAND button 11 FUNCTION button 12 MD/CD =0/)+ + button 13 MD/CD =0/)+ – button 14 CD indicator 15 6 (CD) button 16 LINE IN jack 17 r REC button 18 CD/MD SYNC button 19 Disc tray 20 REPEAT, STEREO/MONO button 21 PLAY MODE/TUNING MODE button 22 PHONES jack 23 Remote sensor 24 Display window

This section is extracted from instruction manual.

SECTION 3

DISASSEMBLY

Note: Follow the disassembly procedure in the numerical order given.

Case (Page 19)

Front panel (Page 20)

Back panel (Page 20)

CD base unit section (Page 22)

MD mechanism deck (Page 23)

Main board and Power transformer (Page 21)

Optical pick-up (CD) (Page 22)

BD (CD) board Sled motor (M102) Spindle motor (M101) (Page 23)

Tray, Gear and Cam section (Page 22)

MD base unit BD (MD) board (Page 24)

Slider (CAM) (Page 24)

Over write head section Optical pick-up (MD) (Page 25)

Sled motor (M902) Spindle motor (M901) (Page 25)

Note: Follow the disassembly procedure in the numerical order given.

3-1. CASE

Two screws

(Case 3 TP2)

Case

Two screws

(Case 3 TP2)

3-2. FRONT PANEL

Front panel block

(Two claws)

Claw

Screw

(BVTT 3x6)

Flat type wire

(31 core)

Claw

Screw

(BVTT 3x6)

Claw

Ground wire (Red)

Screw

(BVTT 3x10)

Screw

(BVTT 3x6)

(25 core)

Ground wire (Black)

MD mechanism bloc

Flat type wire

3-3. BACK PANEL

Claw

Back panel

(Two claws)

Claw

Hole

Three screws

(BVTP 3x10)

Claw

Four screws

(BVTP 3x10)

3-4. MAIN BOARD AND POWER TRANSFORMER

Connector (2P)

!™

Power transformer

Screw

(BVTP 3x6)

Amp board (CN801)

Connector (2P)

Connector (4P)

Connector (Amp board, CN801)

(Take note of the claw)

Screw

(BVTP 3x6)

Connector (3P)

3-5. CD MECHANISM DECK

Flat type wire

(15 core)

Flat type wire

(19 core)

!¡

Four screws

(BVTT 3x6)

Screw

(BVTT 3x6)

Two screws

(BVTT 3x6)

Holder (MDM)

SP board

Power board

Main board

CD mechanism deck

(Two claws)

Connector (5P)

Two claws

(BVTT 3x6)

Screw

(BVTT 3x6)

Flat type wire

(19 core)

3-6. TRAY, GEAR AND CAM

Push the claw in tne

direction of arrow

Gear (B)

Roller

Bushing

Cam (CDM55)

Belt (CDM55)

Pulley (LDG)

Gear (A)

Pull out the tray in the arrow direction A,

and release the lock while pressing

this claw in the arrow direction

3-7. CD BASE UNIT

Floating screw

(PTPWH M2.6)

Pull out the tray.

Remove the Holder (BU) assembly

in the direction of arrow A.

Release

3-8. OPTICAL PICK-UP SECTION OF CD

(KSS-213BA/F-NP)

Optical pick-up (for CD)

Release the lever in the

arrow direction

Sled shaft

Flat type wire

(16 core)

3-9. BD (CD) BOARD, SPINDLE MOTOR (M101) AND SLED MOTOR (M102)

)

Gear (M)

Flatness gear (P)

Sled motor

Two Insulators (BU)

!¡

Spindle motor

(M101)

Sled shaft

Two Insulators (BU)

BD (CD) board

Two screws

(P 2x3)

(M102)

Screw

(BVTP 2.6x8)

Remove the four solders.

M101

IC102

M102

IC103

IC101

3-10. MD MECHANISM DECK

(BVTPWH M3)

MD mechanism deck

Two Step screws

Flat type wire

(21 core)

Bracket (MDM

Two Step screws

(BVTPWH M3)

Connector (7P)

Flat type wire

(23 core)

3-11. SLIDER (CAM)

Slider (CAM)

• Note for installation of Slider (CAM)

Bracket (GUIDE L)

Two screws

(BTP 2.6x6)

Leaf spring

When attaching the slider (cam), this part of the over write head should be inside arrow

Bracket (GUIDE R)

3-12. BASE UNIT (MBU-5A) AND BD (MD) BOARD

Set the shaft of Cam gear to be at the position in the figure.

Set the shaft of Lever (O/C) to be at the position in the figure.

Two screws

(BTP 2.6x6)

Flexible board

CN104

CN101

(M 1.7x4)

CN110

Screw

Three screws

(BTP 2.6x6)

BD (MD) board

Base unit (MBU-5A)

Spindle motor

Sled motor

Remove the two solders.

Remove the two solders. Read wire's color Red : + Black :

3-13. OVER WRITE HEAD

Spindle motor

(M901)

Sled motor

(M902)

Three screws

(B 2x5)

Two screws

(P 1.7x2.5)

Screw (M1.7)

Gear (SL-B)

Gear (SL-A)

The BD (MD) board is soldered at two parts. (See page 24.)

Screw (P 1.7x6)

Over write head

(HR901)

Flexible board

3-14. OPTICAL PICK-UP OF MD (KMS-260B/J1N)

Note: Turn the optical pick-up inside out, and pull out the flexible board.

Main shaft

Screw (B 2x8)

Optical pick-up (for MD)

Leaf spring (SHAFT)

Flexible board

3-15. SPINDLE MOTOR (M901) AND SLED MOTOR (M902) (MD)

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 6 (MD) 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 6 (MD) button after pressing the MENU/NO “R” button and the rotation of disc is stopped.

4-1-1. Recording laser emission mode and operating buttons

• Continuous recording mode (CREC MODE)

• Laser power check mode (LDPWR CHECK)

• Laser power adjustment mode (LDPWR ADJUST)

• Traverse (MO) check (EF MO CHECK)

• Traverse (MO) adjustment (EF MO ADJUST)

• When pressing the rREC button.

4-2. SETTING THE TEST MODE

The following are two methods of entering the test mode. Procedure 1:Press the FUNCTION button, and set the function to “MD”. When the power ON, press the 1/u button while pressing the p

(MD) button and r REC button together. When the test mode is set, “[Check]” will be displayed. Pressing the =0/MD/CD/TUNING – button or )+/MD/ CD/TUNING + button switches between the following four groups; ···Nn Check Nn Adjust Nn Service Nn Develop Nn ···.

Procedure 2:Press the FUNCTION button, and set the function to “MD”. When the power ON, press the 1/u button while pressing the p

(MD) button and SYNC REC button together. When the test mode is set, “TEMP CHECK” will be displayed. By setting the test mode using this procedure, only the “Check” group of procedure 1 can be executed.

4-3. EXITING THE TEST MODE

Press the REPEAT/STEREO/MONO button.

4-4. BASIC OPERATIONS OF THE TEST MODE

All operations are performed using the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button, ENTER/YES “R” button, and MENU/NO “R” button. The functions of these buttons are as follows.

Function name

=0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button ENTER/YES “R” button MENU/NO “R” button

Changes parameters and modes Proceeds onto the next step. Finalizes input. Returns to previous step. Stops operations.

Function

4-5. SELECTING THE TEST MODE

There are 31 types of test modes as shown below. The groups can be switched by pressing the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button. After selecting the group to be used, press the ENTER/YES “R” button. After setting a certain group,

pressing the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button 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

TEMP CHECK LDPWR CHECK EF MO CHECK EF CD CHECK FBIAS CHECK S curve CHECK VERIFY MODE DETRK CHECK TEMP ADJUST LDPWR ADJUST EF MO ADJUST EF CD ADJUST FBIAS ADJUST EEP MODE MANUAL CMD SVDATA READ ERR DP MODE SLED MOVE ACCESS MODE 0920 CHECK HEAD ADJUST CPLAY2 MODE CREC2 MODE ADJ CLEAR AG Set (MO) AG Set (CD) Iop Read Iop Write INFORMATION CPLAY MODE CREC MODE

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 Laser power adjustment 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

Mark

(X) (X) (X)

(X) (!) (X) (X)

(X) (X) (X) (X) (X) (X)

Group (*)

CS C S CS CS CS C C C

AS AS AS AS AS

D D D

D D D D D

D AS AS AS

CS CASD CASD

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 “R” button 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 “R” button to exit the mode immediately . Be especially careful not to set the modes with (!) as they will o verwrite the non-volatile memory and reset it, and as a result, the unit will not operate normally.

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 Press the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button and display “CPLAY MODE”. 3 Press the ENTER/YES “R” button to change the display to “CPLAY MID”. 4 When access completes, the display changes to “C1 = AD = ”.

Note : The numbers “ ” displayed show you error rates and ADER.

2. Changing the parts to be played back 1 Press the ENTER/YES “R” button during continuous playback to change the display as below.

“CPLAY MID” n “CPLAY OUT” n “CPLAY IN”

When pressed another time, the parts to be played back can be moved.

2 When access completes, the display changes to “C1 = AD = ”. Note : The numbers “ ” displayed show you error rates and ADER.

3. Ending the continuous playback mode

1 Press the MENU/NO “R” button. The display will change to “CPLAY MODE”. 2 Press the 6 (MD) button 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 ress the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button and display “CREC MODE”. 3 Press the ENTER/YES “R” button to change the display to “CREC MID”. 4 When access completes, the display changes to “CREC ( )” and r REC indicator lights up.

Note : The numbers “ ” displayed shows you the recording position addresses.

2. Changing the parts to be recorded 1 When the ENTER/YES “R” button is pressed during continuous recording, the display changes as below.

“C REC MID” n “C REC OUT” n “C REC IN”

When pressed another time, the parts to be recorded can be changed. r REC indicator goes off.

2 When access completes, the display changes to “CREC ( )” and r REC indicator lights up. Note : The numbers “ ” displayed shows you the recording position addresses.

3. Ending the continuous recording mode

1 Press the MENU/NO “R” button. The display changes to “CREC MODE” and r REC indicator goes off. 2 Press the 6 (MD) button 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 “R” 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.

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 “R” button immediately to exit it.

4-6. FUNCTIONS OF OTHER BUTTONS

Mode display

Error rate display

Address display

Auto gain display (Not used in servicing)

Detrack check display (Not used in servicing)

IVR display (Not used in servicing)

Function

^ (MD)

p (MD) )+/MD/CD/TUNING + =0/MD/CD/TUNING –

CLEAR “R” PLAY MODE/TUNING MODE DISPLAY “R” 6 (MD) REPEAT/STEREO/MONO

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 ˜ CLV A). Switches the displayed contents each time the button is pressed. Ejects the disc Exits the test mode

Contents

Use the remote commander (RM-SJ373/provided with unit: 1-418-554-11) buttons for operations indicated as “R”.

4-7. TEST MODE DISPLAYS

Each time the DISPLAY “R” button is pressed, the display changes in the following order.

1. Mode display

Displays “TEMP ADJUST”, “CPLAYMODE”, etc.

2. Error rate display

Displays the error rate in the following way.

C1 =

AD = C1 = Indicates the C1 error. AD = Indicates ADER.

3. Address display

The address is displayed as follows. (MO:recordable disc, CD:playback only disc) Pressing the CLEAR “R” button switches between the groove display and pit display. h = s = (MO pit and CD) h = a = (MO groove) h = Indicates the header address. s = Indicates the SUBQ address. a = Indicates the ADIP address.

Note: “–” is displayed when servo is not imposed.

4. Auto gain display (Not used in servicing)

The auto gain is displayed as follows. AG = / [ ]

5. Detrack check display (Not used in servicing)

The detrack is displayed as follows. ADR =

6. IVR display (Not used in servicing)

The IVR is displayed as follows. [ ][ ][

MEANINGS OF OTHER DISPLAYS

Display

( (MD) * P (MD) * r REC *

SYNC LEVEL-SYNC OVER 1 REPEAT TRACK DISC SHUFFLE MONO

During continuous playback (CLV: 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 Lit

* Items shown correspond to the indicated button indicators.

Contents

When Off

STOP (CLV: OFF) Tracking servo ON Recording mode OFF CLV normal mode

Tracking offset cancel OFF

Groove Low reflection CL V A CLV UNLOCK

+ 68 hidden pages

Sony HCD-MD373 User Manual

SELF-DIAGNOSIS FUNCTION

TABLE OF CONTENTS

SERVICING NOTE

GENERAL

DISASSEMBLY

TEST MODE