Sony MDS-JE530 24, Check Prior To Repairs, Temperature Compensation Offset Check, Connection

Page 24
6. CHECK PRIOR TO REPAIRS
+
–
oscilloscope (DC range)

6. CHECK 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 Adjust- ments” (See page 8).

6-1. Temperature Compensation Offset Check

When performing adjustments, set the internal temperature and room temperature of 22 °C to 28 °C.

Checking Procedure:

1.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob to display “TEMP CHECK” (C01).

2.Press the [YES] button.

3.“T=@@(##) [OK” should be displayed. If “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)

6-2. Laser Power Check

Before checking, check the IOP value of the optical pick-up. (Refer to 5-8. Recording and Displaying IOP Information)

Connection :

laser

power meter

Optical pick-up objective lens 6-1. Temperature Compensation Offset Check

digital voltmeter

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 [ÊÊÊÊÊÊ]0 but- ton or[ÊÊÊÊÊÊ]) 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, turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob and display “LDPWR CHECK” (C02).

3.Press the [YES] button once and display “LD 0.9 mW $ Checking Procedure:6-2. Laser Power Check ”. Check that the reading of the laser power meter become 0.84 to 0.92 mW.

4.Press the [YES] button once more and display “LD 7.0 mW $

Connection :Specification: ”. Check that the reading the laser power meter and digital volt meter satisfy the specified value.

Specification:

Laser power meter reading : 7.0 ± 0.2 mW

Digital voltmeter reading : Optical pick-up displayed value ±10%

(Optical pick-up label)

KMS260A

27X40 B0825

lOP=82.5 mA in this case

lOP (mA) = Digital voltmeter reading (mV)/1 (Ω)

5.Press the [MENU/NO] button and display “LDPWR CHECK” and stop the laser emission.

(The [MENU/NO] button is effective at all times to stop the laser emission)

Note 1: After step 4, each time the [YES] button is pressed, the display

will be switched between “LD 0.7 mW $

”, “LD 6.2 mW $

”, and “LD Wp

$

”. Nothing needs to be performed

here.

 

 

 

6-3. Traverse Check

Note 1: Data will be erased during MO reading 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.

BD board

6-3. Traverse Check 330 k Ω

CN110 pin 3 (TEO)

CN110 pin 1 (VC) – 24 –Manual background 10 pF

Connection :

oscilloscope (DC range)

BD board

CN110 pin 3

(TEO)

+

V: 0.1 V/div

CN110 pin 1

(VC)

 

–

H: 10 ms/div

Checking Procedure:

1.Connect an oscilloscope to CN110 pin 3 (TEO) 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 [ÊÊÊÊÊÊ]) button and move the optical pick-up outside the pit.

4.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob and display “EF MO CHECK”(C03).

5.Press the [YES] button and display “EFB = Manual backgroundManual background 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 turn the[ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob.

(Read power traverse checking)

(Traverse Waveform)

A

VC

B

Specified value : Below 10% offset value

Offset value (%) = IA – BI X 100 2 (A + B)

7.Press the [YES] button and display “EFB = Manual backgroundManual background MO-W”.

8.Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob.

(Write power traverse checking)

(Traverse Waveform)

A

VC

B

Specified value : Below 10% offset value

Offset value (%) = IA – BI X 100 2 (A + B)

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Contents SPECIFICATIONS SERVICE MANUALSupplied accessories MDS-JE530SELF-DIAGNOSISFUNCTION – 2 –Items of Error History Mode Items and Contents Table of Error Codes– 3 – Selecting the Test ModeTABLE OF CONTENTS 6.DIAGRAMSDISASSEMBLY ELECTRICAL ADJUSTMENTSFlexible Circuit Board Repairing Notes on chip component replacement– 5 – ADVARSEL– 6 – JIG FOR CHECKING BD BOARD WAVEFORM– 7 – Record PrecedureDisplay Precedure CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS – 8 –– 9 – RETRY CAUSE DISPLAY MODEPrecedure Fig. 1 Reading the Test Mode Display– 10 – Hexadecimal nBinary Conversion TableReading the Display SECTION GENERAL – 11 –LOCATION OF CONTROLS This section is extracted from instruction manualPage SECTION DISASSEMBLY – 13 –CASE FRONT PANEL SECTION– 14 – MAIN BOARDMECHANISM DECK SECTTION MDM-5D – 15 – SLIDER CAMBASE UNIT MBU-5D,BD BOARD – 16 – SW BOARD, LOADING MOTOR M1031. PRECAUTIONS FOR USE OF TEST MODE 2. SETTING THE TEST MODESECTION TEST MODE – 17 –– 18 – 5. SELECTING THE TEST MODE– 19 – 5-1.Operating the Continuous Playback Mode5-3. Non-VolatileMemory Mode EEP MODE – 20 – 6. FUNCTIONS OF OTHER BUTTONS7. TEST MODE DISPLAYS – 21 – MEANINGS OF OTHER DISPLAYSSECTION ELECTRICAL ADJUSTMENTS 1.PARTS REPLACEMENT AND ADJUSTMENT– 22 – 2. PRECAUTIONS FOR CHECKING LASER DIODE EMISSION 4. PRECAUTIONS FOR ADJUSTMENTSLaser power meter – 23 –Checking Procedure 6-2.Laser Power CheckSpecification – 24 –6-5.C PLAY Checking MO Error Rate Check CD Error Rate Check– 25 – 6-4.Focus Bias Check7. INITIAL SETTING OF ADJUSTMENT VALUE 9. TEMPERATURE COMPENSATION OFFSET ADJUSTMENT10. LASER POWER ADJUSTMENT Setting Procedure11. TRAVERSE ADJUSTMENT – 27 –Specification Adjusting Procedure12.FOCUS BIAS ADJUSTMENT – 28 –Adjusting Procedure 13.ERROR RATE CHECK 15.AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT13-1.CD Error Rate Check 13-2.MO Error Rate CheckAdjustment Location – 30 –– BD BOARDSide A – – BD BOARDSide B –MDS-JE530 SECTION DIAGRAMS 6-1.BLOCK DIAGRAM – MD SERVO Section –– 31 – – 32 –6-2.BLOCK DIAGRAM – MAIN Section – MDS-JE530– 33 – – 34 –– 35 – Note on Printed Wiring BoardNote on Schematic Diagram – 36 – • Circuit Boards Location6-4.PRINTED WIRING BOARD – BD Board – – 38 –•See page 36 for Circuit Boards Location •Semiconductor Location– 39 – – 40 –MDS-JE530 6-6.SCHEMATIC DIAGRAM – BD Board 2/2 – See• – 41 –– 42 – MDS-JE5306-7.SCHEMATIC DIAGRAM – SW Board – 6-8.PRINTED WIRING BOARD – SW Board –– 43 – – 44 –6-9.PRINTED WIRING BOARD – MAIN Board – See• – 45 –– 46 – page 36 for Circuit Boards Location– 47 – – 48 –MDS-JE530 Page Page 41 Page– 49 – – 50 –MDS-JE530 – 51 – – 52 –MDS-JE530 • Semiconductor Location– 53 – – 54 –MDS-JE530 Page 47 Page•IC Block Diagrams – BD Board – – 55 –– 56 – IC101– 57 – IC310M5293L IC431– 58 – 6-14.IC PIN FUNCTION DESCRIPTION– 59 – •BD BOARD IC121 CXD2656R– 60 – – 61 – – 62 – •MAIN BOARD IC501 M30624MG-207FPSYSTEM CONTROLLER– 63 – – 64 – SECTION EXPLODED VIEWS – 65 –1CHASSIS SECTION 2FRONT PANEL SECTION 61 64 61 63 61 66 61 6151 53 59 54 52– 67 – 3MECHANISM SECTION MDM-5D 213 207202 201 223 207– 68 – 4BASE UNIT SECTION MBU-5D 252263 270 254 253SECTION ELECTRICAL PARTS LIST – 69 –DISPLAY – 70 –KEY SW – 71 –DISPLAY MAIN – 72 –KEY SW – 73 – MAIN– 74 – MAINPOWER SW – 75 –MAIN MDS-JE530 – 76 –Sony Corporation 9-928-824-11
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