Sony PMCMD-55 Service manual

PMC-MD55

SERVICE MANUAL

Ver 1.0 1999. 06

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

CD Section

MD Section

US Model

Model Name Using Similar Mechanism NEW CD Mechanism Type KSM-213CGP Optical Pick-up Name KSS-213C Model Name Using Similar Mechanism MDS-JB920 MD Mechanism Type MDM-5A Base Unit Name MBU-5A Optical Pick-up Name KMS-260A

SPECIFICATIONS

PERSONAL

MICROFILM

MINIDISC SYSTEM

1. SERVICING NOTES .............................................. 3

2. GENERAL

Playing a CD .................................................................. 6

Recording a Whole CD .................................................. 6

Playing an MD ............................................................... 7

Listening to the radio ..................................................... 7

Setting the Clock ............................................................ 8

Hooking up the System.................................................. 8

3. DISASSEMBLY ........................................................ 9

4. TEST MODE............................................................. 15

5. ELECTRICAL ADJUSTMENTS

Tuner Section ................................................................. 20

MD Section .................................................................... 21

CD Section ..................................................................... 28

Display Section .............................................................. 30

6. DIAGRAMS

6-1. Block Diagram – TUNER Section – ............................ 31

6-2 Block Diagram – MD Section – ................................... 34

6-3. Block Diagram – CD Section – .................................... 37

6-4. Block Diagram

– FUNCTION SELECT/PANEL Section –................... 40

6-5. Block Diagram

– POWER AMP/POWER SUPPLY Section – .............. 43

6-6. Block Diagram – SUPER WOOFER Section – ........... 45

6-7. Printed Wiring Board – TUNER Section – .................. 49

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

6-9. Schematic Diagram – BD Section – ............................. 53

6-10. Printed Wiring Boards – BD Section – ........................ 57

6-11. Printed Wiring Board – DG Section –.......................... 59

6-12. Schematic Diagram – DG Section –............................. 61

6-13. Printed Wiring Boards – MAIN Section – ................... 64

6-14. Schematic Diagram – MAIN (CD) Section – .............. 67

6-15. Schematic Diagram

– MAIN (SYSTEM CONTROL) Section – .................. 70

6-16. Schematic Diagram

– MAIN (FUNCTION SELECT) Section – .................. 73

6-17. Printed Wiring Board – AUDIO/JACK Section –........ 75

6-18. Schematic Diagram – AUDIO/JACK Section – .......... 77

6-19. Schematic Diagram – CD MOTOR Section – ............. 79

6-20. Printed Wiring Board – CD MOTOR Section – .......... 81

6-21. Printed Wiring Board

– CD OPEN/CLOSE Section –...................................... 82

6-22. Schematic Diagram – CD OPEN/CLOSE Section – ... 83

6-23. Printed Wiring Boards – PANEL Section – ................. 86

6-24. Schematic Diagram – PANEL Section – ...................... 89

6-25. Printed Wiring Boards

– POWER AMP/POWER Section – .............................. 91

6-26. Schematic Diagram

– POWER AMP/POWER Section – .............................. 93

6-27. Printed Wiring Boards

– SUPER WOOFER Section – ...................................... 95

6-28. Schematic Diagram

– SUPER WOOFER Section – ...................................... 97

6-29. IC Pin Function Description .......................................... 108

7. EXPLODED VIEWS ............................................... 118

8. ELECTRICAL PARTS LIST ..............................128

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! ON THE SCHEMA TIC 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.

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior.

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

– 2 –

SECTION 1

SERVICING NOTES

SAFETY CHECK-OUT

After correcting the original service problem, perform the following safety check before releasing the set to the customer: Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below.

LEAKAGE TEST

The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microamperes). Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA WT -540A. Follo w the manufacturers’ instructions to use these instruments.

2. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The “limit” indication is 0.75 V, so analog meters must have an accurate lowvoltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2 V A C range are suitable. (See Fig. A)

To Exposed Metal Parts on Set

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care.

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused on the disc reflective surface by the objective lens in the optical pick-up block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.

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 the 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.

1.5 k

0.15 µF

Fig. A. Using an AC voltmeter to check AC leakage.

CHUCK PLATE JIG ON REPAIRING

On repairing CD section, playing a disc without the CD lid, use Chuck Plate Jig.

• Code number of Chuck Plate Jig: X-4918-255-1

Ω

Earth Ground

voltmeter (0.75 V)

– 3 –

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: 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

RF VC TEO IOP I+3V GND

5P Connector

CN110

6P connecto

for MDM-3

for MDM-5

RF VC TEO IOP I+3V

VC RF TEO IOP I+3V GND

– 4 –

CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS (for MD Section)

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 (6-1 : See page 23)

Focus bias check (6-2 : See page 23)

C PLAY check (6-3 : See page 23)

Self-recording/playback check (6-4 : See page 23)

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

• Error rate check Specified value : For points a, b, and c C1 error : About 200 ADER : Below 2

• Error rate check Specified value: a. When using test disc (MDW-74/AU-1)

C1 error : Below 80 ADER : Below 2

b. When using check disc (TDYS-1)

C1 error : Below 50

• CPLAY error rate check Specified value: C1 error : Below 80 ADER : Below 2

• 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

Measure if unsatisfactory:

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.

– 5 –

SECTION 2

GENERAL

This section is extracted from instruction manual.

– 6 –

– 7 –

– 8 –

DISASSEMBLY

)

• This set can be disassembled in the order shown below.

SECTION 3

Set Rear cabinet Front cabinet block

Main board section Main board

Slider (CAM) Base unit (MBU-5A), BD board SW board, loading motor (M103)

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

REAR CABINET

Upper cabinet block CD PICK-UP assy

TU block, MD block MD mechanism deck

three screws (BTP2.6

four screws

(BTP3

10)

screw (BTP3

two screws

(BVTT3

rear cabinet

four screws (BTP3

– 9 –

FRONT CABINET BLOCK

)

harness

three screws (BVTP3

12)

three screws (BVTP3

cabinet (front) block

UPPER CABINET BLOCK

connector (CN711)

wire, parallel (ffc) 12P (CN407)

cabinet (upper) block

wire, parallel (ffc) 16P (from OPTICAL PICK-UP connector)

wire, parallel (ffc) 11P (CN1001)

wire, parallel (ffc) 8P (CN409)

– 10 –

three claws

CD PICK-UP ASSY

)

two screws (PWH2.6

10)

PICK-UP assy

two screws (PWH2.6

10)

MAIN BOARD SECTION

two screws

wire parallel (ffc) 11P (CN702)

(BVTP3

connector (CN408)

connector (CN402)

wire parallel (ffc) 16P (CN701)

10)

connector (CN704)

connector (CN302)

two screws (BVTP3

main board section

connector (CN303)

connector (CN401

connector (CN404)

wire parallel (ffc) 26 (CN405)

wire parallel (ffc) 9P (CN406)

10)

connector (CN312)

– 11 –

wire parallel (ffc) 8P (CN409)

MAIN BOARD

)

shield plate (main)

two screws (BVTT2.6

main board

TU BLOCK, MD BLOCK

screw (BVTP2.6

two screws (BVTT2.6

shield plate (front)

four screws (BVTP2.6

MD block assy

two screws (BVTP3

10)

two screws (BVTP3

10)

TU block assy

screw (BVTP3

harness

10)

two screws (BVTP2.6

10)

LCD block assy

– 12 –

MD MECHANISM DECK

two screws (BVTTWH M3)

MD mechanism deck (MDM-5A)

four claws

shield plate (upper)

two screws (BVTTWH M3)

connector (CN601)

wire, parallel (ffc) 21P (CN102)

wire, parallel (ffc) 23 (CN103)

SLIDER (CAM)

bracket (Guide L)

two screws (P2.6 × 6)

leaf spring

slider (Cam)

harness

• Note for Installation of Slider A (Cam)

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 (P2.6 × 6)

bracket (Guide R)

– 13 –

BASE UNIT (MBU-5A), BD BOARD

flexible board

(CN104)

flexible board

(CN101)

three screws

(P2.6

base unit (MBU-5A)

SW BOARD, LOADING MOTOR (M103)

screw (M1.7 × 4)

two screws

(PWH1.7

BD board

gear B

Remove the solder (Five portion).

screw (PTPWH M2.6 × 6)

loading motor (M103)

SW board

three screws (BTP2.6 × 6)

– 14 –

SECTION 4

TEST MODE

Refer to “5. ELECTRICAL ADJUSTMENT” for the test mode of CD section.

MD SECTION

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 [MDEJECT] 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 [MDEJECT] button after pressing the [NO,CANCEL] button and the rotation of disc is stopped.

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)

• When pressing the [REC] button.

2. SETTING THE TEST MODE

1. Set to standby state.

2. While pressing the both [BASS/TREBLE] and [EDIT] buttons, press the button [,MD] n π (MD) n [,MD] n π (MD).

3. Release the both [BASS/TREBLE] and [EDIT] buttons to enter the MD test mode.

3. RELEASING THE TEST MODE

Press the [POWER] button to turn the power OFF, or press the [RESET] (bottom of the player unit) switch.

ﬂﬂ

[]

4. BASIC OPERATIONS OF THE TEST MODE

All operations are performed using the JOG dial, [YES,ENTER] button, and [NO,CANCEL] button. The functions of these buttons are as follows.

Function name Function

JOG dial Changes parameters and modes YES, ENTER button Proceeds onto the next step. Finalizes input. NO, CANCEL button Returns to previous step. Stops operations.

– 15 –

5. SELECTING THE TEST MODE

There are 9 types of test modes as shown below. The groups can be switched by turning the JOG dial. After selecting the g roup to be used, press the [YES,ENTER] button. After setting a certain group, turn the JOG dial switches between these modes.

Display

TEMP ADJUST LDPWR ADJUST LDPWR CHECK EFBAL ADJUST FBIAS ADJUST FBIAS CHECK CPLAY MODE CREC MODE EEP MODE

• For details of each adjustment mode, refer to “5. Electrical Adjustments”.

• If a different mode has been selected by mistake, press the [NO,CANCEL] button to release that mode.

• EEP MODE is not used for servicing and therefore are not described in detail. If these modes are set accidentally , press the [NO,CANCEL] button to release the mode immediately. Be especially careful this mode will overwrite the non-volatile memory and reset it, and as a result, the unit will not operate normally.

Temperature compensation offset adjustment Laser power adjustment Laser power check EF balance adjustment Focus bias adjustment Focus bias check Continuous playback mode Continuous recording mode Non-volatile memory control

Contents

– 16 –

5-1. Operating the Continuous Playback Mode

1. Entering the continuous playback mode (1) Set the disc in the unit. (Whichever recordable discs or discs for playback only are available) (2) Turn the JOG dial and display “CPLAY MODE”. (3) Press the [YES,ENTER] 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 [YES,ENTER] 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 [NO,CANCEL] button. The display will change to “CPLAY MODE”. (2) Press the [MDEJECT] button and take out the disc.

Note: The playback start addresses for IN, MID, and OUT are as follows.

IN : 40h cluster MID : 300h cluster OUT: 700h cluster

5-2. Operating the Continuous Recording Mode (Use only when performing self-recording/palyback check)

1. Entering the continuous recording mode (1) Set a recordable disc in the unit. (2) Turn the JOG dial and display “CREC MODE”. (3) Press the [YES,ENTER] button to change the display to “CREC MID”. (4) When access completes, the display changes to “CREC ( )” and “[REC]” lights up.

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

2. Changing the parts to be recorded (1) When the [YES,ENTER] button is pressed during continuous recording, the display changes as below.

“CREC MID” n “CREC OUT” n “CREC IN”

When pressed another time, the parts to be recorded can be changed. “

(2) When access completes, the display changes to “CREC ( )” and “[REC]” lights up.

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

3. Ending the continuous recording mode (1) Press the [NO,CANCEL] button. The display changes to “CREC MODE” and “[REC]” goes off. (2) Press the [MDEJECT] button and take out the disc.

Note 1: The recording start addresses for IN, MID, and OUT are as follows.

IN : 40h cluster MID : 300h cluster OUT: 700h cluster

Note 2: The [NO,CANCEL] 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.

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 the unit entered this mode accidentally, press the [NO,CANCEL] button immediately to release it.

[REC]” goes off.

– 17 –

6. FUNCTIONS OF OTHER BUTTONS

Function

ﬂ, MD and EDIT π (MD) and EDIT

) 0

REC and EDIT SYNCHRO REC and EDIT AUTO PRESET and EDIT DISPLAY MD EJECT 6 POWER or RESET

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. When pressed during continuous playback, REC ON/OFF. Switches between the pit and groove modes when pressed. When pressed during continuous playback, switches the spindle servo mode (CLV-S ˜ CLV-A). Switches the displayed contents each time the button is pressed Ejects the disc Releases the test mode

Contents

7. TEST MODE DISPLAYS

Each time the [DISPLAY] 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 = ππππ AD = ππ C1 = Indicates the C1 error. AD = Indicates ADER.

Mode display

Error rate display

Address display

3. Address display

The address is displayed as follows. (MO: recordable disc, CD: playback only disc) Press the h = ππππ s = ππππ (MO pit and CD) h = ππππ a = ππππ (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 F = ππ T = ππ

5. IVR display (Not used in servicing)

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

[SCROLL] button to switches between the groove display and pit display.

Auto gain display

(Not used in servicing)

IVR display

(Not used in servicing)

– 18 –

MEANINGS OF OTHER DISPLAYS

Display

SHUF PGM

[REC]

TOC EDIT DIGITAL

TRACK MD disc mark DA TE

When Lit

During continuous playback (CLV: ON) Tracking servo OFF Recording mode ON ABCD adjustment completed

Foucs and tracking auto gain OK Pit

High reflection CLV-S CLV LOCK

Contents

When Off

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

Blink: Focus auto gain OK,

Tracking auto gain NG Groove Low reflection CLV-A CLV UNLOCK

– 19 –

SECTION 5

ELECTRICAL ADJUSTMENTS

TUNER SECTION 0 dB=1 µV

[AM]

Setting:

Function : RADIO BAND switch: AM

AM RF signal

generator

30% amplitude modulation by 400 Hz signal Output level: as low as possible

[FM]

Setting:

Function : RADIO BAND switch : FM MONO/ST switch: stereo

FM RF signal

generator

75 kHz frequency deviation by 1 kHz signal Output level: as low as possible

Put the lead-wire antenna close to the set.

set

TU board

TP (FM+)

set

TU board TP (FM–)

0.01

level mete

32 Ω

+ –

(headphone) jack

level mete

32 Ω

+ –

(headphone) jac

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter

T1 450 kHz

AM VT VOLTAGE CONFIRMATION

Adjustment Part Frequency Display Reading on Digital Voltmeter

Confirmation 530 kHz 0.7 V Confirmation 1,710 kHz 5 ± 1 V

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L4 620 kHz

CT2 1,400 kHz

FM VT VOLTAGE ADJUSTMENT

Adjustment Part Frequency Display Reading on Digital Voltmeter

L2 108 MHz 4.2 ± 0.2 V

Confirmation 87.5 MHz 1.9 V

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L1 87.5 MHz

CT1 108 MHz

+ 0.8 – 0.3

+ 0.2 – 0.4

digital voltmeter

TU board

TP (CV)

TP (FM–)

100 kΩ

• Repeat the procedures in each adjustment several times, and the tracking adjustments should be finally done by the trimmer capacitors.

Adjustment Location:

– TU BOARD (Component Side) –

FM tracking Adjustment

FM VT Voltage Adjustment

AM IF Adjustment

CT1

L4 CT2

AM Tracking

Adjustment

– TU BOARD (Conductor Side) –

TB1

TP (FM+)

TP (CV) TP (FM–)

IC1

– 20 –

MD SECTION

1. PARTS REPLACEMENT AND ADJUSTMENT

• Check and adjust the mechanism deck as follows. The procedure changes according to the part replaced.

• Laser power check

• Focus bias check

• C PLAY check

• Self-recording/playback check

Parts Replacement and Repair

• Abbreviation OP : Optical pick-up OWH :Overwrite head

Check the sled and spindle mechanisms. Other causes can be suspected.

Has the OWH been replaced?

Has OP, IC171, IC101, or IC121 been replaced?

YES

Initial setting of the adjustment value

Has OP or IC171 been replaced?

YES

IOP information recording (IOP value labeled on OP)

YES

Has IC171 or D101 been replaced?

YES

Temperature compensation offset adjustment

• Laser power adjustment

• Traverse adjustment

• Focus bias adjustment

• Error rate adjustment

• Focus bias check

• Auto gain adjustment

– 21 –

2. PRECAUTIONS FOR CHECKING LASER DIODE EMISSION

T o check the emission of the laser diode during adjustments, nev er view directly from the top as this may lose your eye-sight.

3. PRECAUTIONS FOR USE OF OPTICAL PICK-UP (KMS-260A)

As the laser diode in the optical pick-up is easily damaged by static electricity, solder the laser tap of the fle xible 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

laser tap

flexible board

Optical pick-up flexible board

4. PRECAUTIONS FOR ADJUSTMENTS

1. When replacing the following parts, perform the adjustments

and checks with ¬ in the order shown in the following table.

D101

BD Board

IC101, IC121

¬G

IC192

1.Temperature compensation offset adjustment

2.Laser power adjustment

3.EF balance adjustment

4.Focus bias adjustment

5.Error rate check

Optical

Pick-up

IC171

¬¬GGG

¬G¬¬¬

¬G¬¬G

¬G

4. Use the following tools and measuring devices.

• Check Disc (MD) TDYS-1 (Part No. 4-963-646-01)

• Test Disc (MDW-74/AU-1) (Part No. 8-892-341-41)

• Laser power meter LPM-8001 (Part No. J-2501-046-A) or MD Laser power meter 8010S (Part No. J-2501-145-A)

• Oscilloscope (Measure after performing CAL of prove)

• Digital voltmeter

• Thermometer

• Jig for checking BD board waveform (Part 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 Notes on page 4)

7. As the disc used will affect the adjustment results, make sure that no dusts nor fingerprints are attached to it.

Laser power meter

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

5. CREATING CONTINUOUSLY-RECORDED DISC

* 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. Turn the JOG dial and display “CREC MODE”.

3. Press the Display “CREC (0300)” and start to recording.

4. Complete recording within 5 minutes.

5. Press the [NO,CANCEL] button and stop recording .

6. Press the [MDEJECT] button and remove the disc.

The above has been how to create a continuous recorded data for the focus bias adjustment/check and MO error rate check.

Note :

• Be careful not to apply vibration during continuous recording.

[YES,ENTER] button again to display “CREC MID”.

2. Set the test mode when performing adjustments. After completing the adjustments, release 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.

– 22 –

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 Adjustments” (See page 5).

6-1. Laser Power Check

Connection :

laser power mete

Optical pick-up objective lens

digital voltmete

BD board

CN110 pin 5 (I +3V) CN110 pin

(IOP)

+ –

6-2. Focus Bias Check

Change the focus bias and check the focus tolerance amount.

Checking Procedure :

1. Load the test disk (MDW-74/AU-1).

2. Turn the JOG dial to display “CPLAY MODE”.

3. Press the [YES,ENTER] button twice to display “CPLAY MID”.

4. Press the [NO,CANCEL] button when “C1 = AD = ” is displayed.

5. Turn the JOG dial to display “FBIAS CHECK”.

6. Press the [YES,ENTER] button to display “ / c = ”. The first four digits indicate the C1 error rate, the two digits after [/] indicate ADER, and the 2 digits after [c =] indicate the focus bias value. Check that the C1 error is below 50 and ADER is below 2.

7. Press the [YES,ENTER] button to display “ / b = ”. Check that the C1 error is about 200 and ADER is below 2.

8. Press the [YES,ENTER] button to display “ / a = ”. Check that the C1 error is about 200 and ADER is below 2.

9. Press the [NO,CANCEL] button, then press the [MDEJECT]

button and take out the test disc.

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 0 button or ) button to move the optical pick-up)

[]

Connect the digital voltmeter to CN110 pin 5 (I+3V) and CN110 pin 4 (IOP) on the BD board.

2. Then, turn the JOG dial to display “LDPWR CHECK”.

3. Press the [YES,ENTER] button once to display “LD 0.9 mW $ ”. Check that the reading of the laser power meter become

0.84 to 0.92 mW.

4. Press the

[YES,ENTER] button once more to display “LD

7.0 mW $ ”. Check that the reading the laser power meter and digital voltmeter satisfy the specified value.

Specified V alue:

Laser power meter reading : 7.0 ± 0.2 mW Digital voltmeter reading : Value on the o ptical pick-up label

±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 [NO,CANCEL] button to display “LDPWR CHECK” and stop the laser emission. (The [NO,CANCEL] button is effective at all times to stop the laser emission)

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

the display will be switched “LD 0.7 mW $ ”, “LD 6.2 mW $

”, and “LD WP $ ”. Nothing needs to be performed

here.

6-3. C PLAY Check

MO Error Rate Check

Checking Procedure :

1. Load the test disk (MDW-74/AU-1).

2. Turn the JOG dial to display “CPLAY MODE”.

3. Press the [YES,ENTER] button to display “CPLAY MID”.

4. The display changes to “C1 = AD = ”.

5. If the C1 error rate is below 80, check that ADER is below 2.

6. Press the the [MDEJECT] button and take out the test disc.

[NO,CANCEL] button to stop playback, then press

CD Error Rate Check

Checking Procedure :

1. Load the check disc (MD) TDYS-1.

2. Turn the JOG dial to display “CPLAY MODE”.

3. Press the [YES,ENTER] button twice to display “CPLAY MID”.

4. The display changes to “C1 = AD = ”.

5. Check that the C1 error rate is below 50.

6. Press the [NO,CANCEL] button to stop playback, then press the [MDEJECT] button and take out the check disc.

6-4. Self-Recording/playback Check

Prepare a continuous recording disc using the unit to be repaired and check the error rate.

Checking Procedure :

1. Load a recordable disc (blank disc).

2. Turn the JOG dial to display “CREC MODE”.

3. Press the [YES,ENTER] button to display “CREC MID”.

4. When recording starts, lights up “[REC]” and display “CREC @@@@” (@@@@ is the address).

5. About 1 minute later, press the [NO,CANCEL] button to stop continuous recording.

6. Turn the JOG dial to display “CPLAY MODE”.

7. Press the [YES,ENTER] button to display “CPLAY MID”.

8. “C1 = AD = ” will be displayed.

9. Check that the C1 error becomes below 80 and the ADER below 2.

10. Press the [NO,CANCEL] button to stop playback, then press the [MDEJECT] button and take out the disc.

– 23 –

7. TEMPERATURE COMPENSATION OFFSET

ADJUSTMENT

Save the temperature data at that time in the non-volatile memory as 25 ˚C reference data.

Note :

1. Usually, do not perform this adjustment.

2. Perform this adjustment in an ambient temperature of 22 ˚C to 28 ˚C. Perform it immediately after the power is turned on when the internal temperature of the unit is the same as the ambient temperature of 22 ˚C to 28 ˚C.

3. When D101 has been replaced, perform this adjustment after the temperature of this part has become the ambient temperature.

Adjusting Procedure :

1. Turn the JOG dial to display “TEMP ADJUST”.

2. Press the [YES,ENTER] button to select the “TEMP AD-

JUST” mode.

3. “TEMP = ” and the current temperature data will be dis-

played.

4. To save the data, press the [YES,ENTER] button.

When not saving the data, press the [NO,CANCEL] button.

5. When the [YES,ENTER] button is pressed, “TEMP = SAVE”

will be displayed and turned back to “TEMP ADJUST” display then. When the [NO,CANCEL] button is pressed, “TEMP ADJUST” will be displayed immediately.

Specified Value :

The “TEMP = ” should be within “E0 - EF”, “F0 - FF”, “00 0F”, “10 - 1F” and “20 - 2F”.

8. LASER POWER ADJUSTMENT

7. Then, turn the JOG dial to display “LDPWR CHECK”.

8. Press the [YES,ENTER] button once to display “LD 0.9 mW $ ”. Check that the reading of the laser power meter become

0.85 to 0.91 mW.

9. Press the [YES,ENTER] button once more to display “LD

7.0 mW $ ”. Check that the reading the laser power meter and digital voltmeter satisfy the specified value. Note down the digital voltmeter reading value.

Specified Value:

Laser power meter reading: 7.0 ± 0.2 mW Digital voltmeter reading : Value on the op tical pick-up label

±10%

(Optical pick-up label)

KMS260A

27X40 B0825

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

10. Press the

[NO,CANCEL] button to display “LDPWR CHECK”

and stop the laser emission. (The [NO,CANCEL] button is effective at all times to stop the laser emission)

Note 1: After step 9, each time the [YES,ENTER] button is pressed, the

display will be switched “LD 0.7 mW $ ”, “LD 6.2 mW $ ”, and “LD WP $ ”. Nothing needs to be performed

here.

Connection :

laser power mete

Optical pick-up objective lens

digital voltmete

BD board

CN110 pin 5 (I +3V) CN110 pin

(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 0 button or ) button to move the optical pick-up)

[]

Connect the digital voltmeter to CN110 pin 5 (I+3V) and CN110 pin 4 (IOP) on the BD board.

2. Turn the JOG dial to display “LDPWR ADJUST”. (Laser power : For adjustment)

3. Press the

[YES,ENTER] button once to display “LD 0.9 mW

$ ”.

4. Turn the JOG dial so that the reading of the laser power meter becomes 0.85 to 0.91 mW. Press the [YES,ENTER] button after setting the range knob of the laser power meter , and sav e the adjustment results. (“LD SAVE $ ” will be displayed for a moment)

5. Then “LD 7.0 mW $ ” will be displayed.

6. Turn the JOG dial so that the reading of the laser power meter becomes 6.9 to 7.1 mW, press the [YES,ENTER] button to save it.

Note: Do not perform the emission with 7.0 mW more than 15 seconds

continuously.

– 24 –

9. EF BALANCE ADJUSTMENT

Note 1:Data will be erased during MO reading if a recorded disc is

used in this adjustment.

Note 2:If the traverse wa veform is not clear , connect the oscilloscope

as shown in the following figure so that it can be seen more clearly.

BD board CN110 pin 3 (TEO) CN110 pin

330 k

(VC)

Connection :

oscilloscope

(DC range)

BD board

CN110 pin 3 (TEO) CN110 pin

(VC)

Adjusting Procedure :

1. Connect an oscilloscope to CN110 pin 3 (TEO) and CN110 pin 1 (VC) on the BD board.

2. Load a disc (any available on the market). (Refer to Note 1)

3. Press the ) button to move the optical pick-up outside the

[]

pit.

4. Turn the JOG dial to display “EFBAL ADJUST”.

5. Press the [YES,ENTER] button to display “EFB = MOR”. (Laser power READ power/Focus servo ON/tracking servo OFF/spindle (S) servo ON)

6. Turn the JOG dial so that the waveform of the oscilloscope becomes the specified value. (When the JOG dial is turned, the and the waveform changes) In this adjustment, wa veform v aries at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible. (Read power traverse adjustment)

Traverse Wav ef orm

Specification A = B

7. Press the [YES,ENTER] button and save the result of adjustment to the non-volatile memory . (“EFB = SAVE” will be displayed for a moment. Then “EFB = MO-W” will be displayed)

oscilloscope

(DC range)

Ω

10 pF

+ –

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

of “EFB= ” changes

8. Turn the JOG dial so that the waveform of the oscilloscope becomes the specified value. (When the JOG dial is turned, the

of “EFB- ” changes and the waveform changes) In this adjustment, wa veform v ar ies at intervals of approx. 2%. Adjust the wa veform so that the specified value is satisfied as much as possible. (Write power traverse adjustment)

Traverse Wav ef orm

Specification A = B

9. Press the [YES,ENTER] button, and save the adjustment results in the non-volatile memory. (“EFB = SAVE” will be displayed for a moment)

10. “EFB = MO-P” will be displayed. The optical pick-up moves to the pit area automatically and servo is imposed.

11. Turn the JOG dial 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 Wav ef orm

Specification A = B

12. Press the [YES,ENTER] button, and save the adjustment results in the non-volatile memory. (“EFB = SAVE” will be displayed for a moment) Next “EFBAL ADJUST” is displayed. The disc stops rotating automatically.

13. Press the [MDEJECT] button and take out the disc.

14. Load the check disc (MD) TDYS-1.

15. Press the [YES,ENTER] button to display “EFB = CD”. Servo is imposed automatically.

16. Turn the JOG dial 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.

– 25 –

Traverse Wav ef orm

Specification A = B

17. Press the [YES,ENTER] button, display “EFB = SAVE” for a moment and save the adjustment results in the non-volatile memory. Next “EFBAL ADJUST” will be displayed.

18. Press the [MDEJECT] button and take out the disc.

10. FOCUS BIAS ADJUSTMENT

Adjusting Procedure :

1. Load the continuously-recorded disc. (Refer to “5. CREATING CONTINUOUSLY-RECORDED DISC”)

2. Turn the JOG dial to display “CPLAY MODE”.

3. Press the [YES,ENTER] button to display “CPLAY MID”.

4. Press the [NO,CANCEL] button when “C1 = AD = ” is displayed.

5. Turn the JOG dial to display “FBIAS ADJUST”.

6. Press the [YES,ENTER] button to display “ / a = ”. The first four digits indicate the C1 error rate, the two digits after [/] indicate ADER, and the 2 digits after [a =] indicate the focus bias value.

7. Turn the JOG dial clockwise and find the focus bias value at which the C1 error rate becomes about 200 (Refer to Note 2).

8. Press the [YES,ENTER] button to display “ / b = ”.

9. Turn the JOG dial counterclockwise and find the focus bias value at which the C1 error rate becomes about 200.

10. Press the [YES,ENTER] button to display “ / c = ”.

11. Check that the C1 error rate is below 50 and ADER is 00. Then press the [YES,ENTER] button.

12. If the “( )” in “ - - ( )” is above 20, press the

[YES,ENTER] button.

If below 20, press the [NO,CANCEL] button and repeat the adjustment from step 2.

13. Press the

Note 1: The relation between the C1 error and focus bias is as shown in

Note 2: As the C1 error rate changes, perform the adjustment using the

C1 error

about 200

[MDEJECT] button and take out the disc.

the following figure. Find points A and B in the follo wing figure using the above adjustment. The focal point position C is automatically calculated from points A and B.

average vale.

11. ERROR RATE CHECK

11-1. CD Error Rate Check

Checking Procedure :

1. Load the check disc (MD) TDYS-1.

2. Turn the JOG dial and display “CPLAY MODE”.

3. Press the [YES,ENTER] button twice and display “CPLAY

MID”.

4. The display changes to “C1 = AD = ”.

5. Check that the C1 error rate is below 20.

6. Press the [NO,CANCEL] button to stop playback, then press the [MDEJECT] button and take out the check disc.

11-2. MO Error Rate Check

Checking Procedure :

1. Load the continuously-recorded disc. (Refer to “5. CREATING CONTINUOUSLY-RECORDED DISC”)

2. Turn the JOG dial to display “CPLAY MODE”.

3. Press the [YES,ENTER] button to display “CPLAY MID”.

4. The display changes to “C1 = AD = ”.

5. If the C1 error rate is below 50, check that ADER is 00.

6. Press the [NO,CANCEL] button to stop playback, then press the [MDEJECT] button and take out the test disc.

12. FOCUS BIAS CHECK

Change the focus bias and check the focus tolerance amount.

Checking Procedure :

1. Load the continuously-recorded disc. (Refer to “5. CREATING CONTINUOUSLY-RECORDED DISC”)

2. Turn the JOG dial to display “CPLAY MODE”.

3. Press the [YES,ENTER] button twice to display “CPLAY MID”.

4. Press the is displayed.

5. Turn the JOG dial to display “FBIAS CHECK”.

7. Press the [YES,ENTER] button and display “ / b = ”. Check that the C1 error is about 200 and ADER is below 2.

8. Press the [YES,ENTER] button and display “ / a = ”. Check that the C1 error is about 200 and ADER is below 2

9. Press the [NO,CANCEL] button, then press the [MDEJECT] button and take out the disc.

[NO,CANCEL] button when “C1 = AD = ”

C A Focus bias value

(F. BIAS)

Note 1: If the C1 error and ADER are above other than the specified

value at points A (step 8. in the abo ve) or B (step 7. in the abov e), the focus bias adjustment may not have been carried out properly. Adjust perform the beginning again.

– 26 –

Adjustment Location:

– BD BOARD (Component Side) –

CN101

D101

NOTE

IC171

GND I+3V

IOP TEO

RF VC

CN110

– BD BOARD (Conductor Side) –

IC101

IC121

IC192

Note: It is useful to use the jig for checking the waveform. (Refer to Ser-

vicing Notes on page 4)

– 27 –

CD SECTION

Set the CD test mode when performing confirmations. After completing the confirmation, release the CD test mode.

In the CD test mode, the set works as following sequence.

CD test mode sequence:

Display

88 XX XX XXX

1. Enter the CD test mode (STOP mode 1)

Press the button.

Note1: ALL SERVO ON mode 1 and TRACKING GAIN UP mode 1:

Note2: TRACKING GAIN UP mode 1,2 is not used in servicing.

(CD)

2. STOP mode 2

[,CD]

ﬂ

[,CD]

ﬂ

[,CD]

ﬂ

[,CD]

ﬂ

[,CD]

ﬂ

[,CD]

ﬂ

LPC ON (Lights up “ALL” indication) ALL SERVO ON mode 2 and TRACKING GAIN UP mode 2: LPC OFF (Does not lights up “ALL” indication) *) LPC: Laser power control

3. FOCUS mode

4. ALL SERVO ON mode 2

5. TRA CKING

GAIN UP mode 1

6. TRA CKING

GAIN UP mode 2

7. ALL SERVO

ON mode1

Press the π (CD) button.

1. Entering the CD Test Mode

1. Press the [POWER] button to turn the power ON.

2. Press the [CDOPEN/CLOSE] button to open the disc lid, and put a disc.

3. Press the [CDOPEN/CLOSE] button to close the disc lid.

4. Press the [POWER] button to standby state.

5. While pressing the both [BASS/TREBLE] and [EDIT] buttons, press the button [,CD] n [] (CD) n [,CD] n

[] (CD).

ﬂ

6. Release the both [BASS/TREBLE] and [EDIT] buttons.

7. After display “CD” for a few seconds, enter the CD test mode (STOP mode 1), and display as below.

ﬂ

2. STOP Mode 2

1. Press the π (CD) button to enter the STOP mode 2, and display as below.

[]

Display

88 07 00 3A0

2. Press the + and = button to move the optical pickup to position of the track where signal is recorded.

3. FOCUS Mode (Traverse Confirmation)

1. Press the ﬂ button to enter the FOCUS mode and display as below. (Focus servo ON. CLV-S, tacking and sled servo OFF)

[] []

[]

Display

11 07 00 3A0

2. Connect an oscilloscope to TP (TEO) and TP (VC) on the MAIN board.

Connection:

oscilloscope

(DC range)

MAIN board

TP (TEO) TP (VC)

3. Confirm that the traverse level of waveform satisfy specified value as follows.

T ra verse W a vef orm

Specified Value:

traverse level: 160 to 380 mVp-p

Connecting Location: MAIN board (See page 29)

+ –

A = B

traverse level: 160 to 380 mVp-p

– 28 –

4. ALL SERVO ON Mode 1

(RF Level and Jitter Confirmation 1)

1. Press the ﬂ button four times to enter the ALL SERVO ON mode 1 (start playback the disc) and display as below. (All servo ON. LPC ON)

[]

Display

21 07 00 3A0

ALL

2. Connect an oscilloscope to TP (RFO) and TP (VC) on the MAIN board.

Connection:

oscilloscope

(DC range)

MAIN board

TP (RFO) TP (VC)

3. Confirm that the RF level and jitter of waveform satisfy specified values as follows.

+ –

6. Releasing the CD Test Mode

1. Press the π (CD) button to stop rotate the disc.

2. Press the [POWER] button or [RESET] switch (bottom of the player unit) to release the CD test mode and turn to standby state.

Connecting Location:

– MAIN BOARD – (Component Side)

[]

TP (TEO)

TP (VC)

TP (RFO)

IC701

RF signal waveform

VOLT/DIV: 200 m TIME/DIV: 500 ns

RF level:

1.0 to 1.4 Vp-p

Specified V alues:

RF level: 1.0 to 1.4 Vp-p jitter : less than 9 nsec

Connecting Location: MAIN board

5. ALL SERVO ON Mode 2 (RF Level and Jitter Confirmation 2)

1. Press the ﬂ button to enter the LPC OFF mode and dis-

play as below. (All servo ON. LPC OFF)

[]

Display

21 07 00 3A0

2. Confirm that the RF level and jitter of waveform satisfy speci-

fied values as follows.

Specified V alues:

RF level: 0.8 to 1.4 Vp-p jitter : less than 9 nsec

If the RF level and jitter are out of specifide values, measure again after clean the object lens by an applicator with lens cleaning liquid.

– 29 –

DISPLAY SECITON

Dimmer Adjustment

Connection:

digital voltmete

LCD board

TP (DIMMER) TP (GND)

1. Connect a digital voltmeter to TP (DIMMER) and TP (GND) on the LCD board.

2. Adjust RV550 so that the value of digital voltmeter becomes

2.83 V.

Specified Value: 2.83 to 2.93 V

Note: Connect the liquid crystal display unit (LCD500) to the LCD board

when performing adjustment.

Adjustment Location:

– LCD BOARD (Component Side) –

+ –

RV550

Dimmer Adjustment

– LCD BOARD (Conductor Side) –

CN553

TP (DIMMER)

TP (GND)

– 30 –

+ 79 hidden pages

Sony PMCMD-55 Service manual

TABLE OF CONTENTS

SERVICING NOTES

GENERAL

DISASSEMBLY

TEST MODE

ELECTRICAL ADJUSTMENTS

TUNER SECTION 0 dB=1 µV

MD SECTION

CD SECTION

DISPLAY SECITON