SONY ZS-M7 service manual.pdf

SERVICE MANUAL

ZS-M7

US Model

AEP Model

UK Model

Tourist Model

Ver 1.2 2001.07

With SUPPLEMENT 1

(9-923-346-82)

Dolby noise reduction manufactured under license from

Dolby Laboratories Licensing Corporation.

“DOLBY” and the double-D symbol a are trademarks of

Dolby Laboratories Licensing Corporation.

Model Name Using Similar Mechanism NEW

MD Mechanism Type

MDM-3EG

Section

Optical Pick-up Type

KMS-260A

Model Name Using Similar Mechanism NEW

MD Mechanism Type

CDM-2411AAA

Section

Optical Pick-up Type

DAX-11A

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS

POWER OUTPUT AND TOTAL HARMONIC DISTORTION

With 4-ohm loads, both channels driven from 100 – 10,000 Hz ; rated 7W

per channel-minimum RMS power, with no more

than 10% total harmonic distortion in AC operation (US Model).

EXCEPT US Model :

FM : 87.6 – 107 MHz

MW : 531 – 1,602 kHz

LW : 153 – 279 kHz

FM : 10.7 MHz

MW/LW : 450 kHz

CD player Section

System Compact disc digital audio system

Laser diode properties

Material: GaAlAs

Wave length: 785 nm

Emission duration : Continuous

Laser output : Less than 44.6 µ W

(This output is the value measured at a distance of about 200

mm from the objective lens surface on the optical pick-up

block with 7 mm aperture.)

Spindle speed

200 r/min (rpm) to 500 r/min (rpm) (CLV)

Number of programme positions

Frequency response

20 – 20,000 Hz +1 /–2 dB

Wow and flutter

Below measurable limit

Aerials

FM : Telescopic areal

Extension areal terminal

AM : Extension areal terminals (US Model)

MW/LW : Extension areal terminals (EXCEPT US Model)

MD player section

System

Minidisc digital audio system

Disc MiniDisc

Laser diode properties

Material: GaAlAs

Wave length: 785 nm

Emission duration : Continuous

Laser output : Less than 44.6 µ W

(This output is the value measured at a distance of about 200

mm from the objective lens surface on the optical pick-up

block with 7 mm aperture.)

Radio section

Frequency range

US Model :

FM : 87.6 – 108 MHz

AM : 530 – 1,710 kHz

– Continued on page 2 –

PERSONAL MINIDISC SYSTEM

9-923-346-12

2001G0200-1

Sony Corporation

Personal Audio Company

Shinagawa Tec Service Manual Production Group

Recording/Playback time

Maximum 74 minutes (with MDW-74)

Revolutions

400 rpm to 900 rpm (CLV)

Error correction

Advanced Cross Interleave Reed Solomon Code (ACIRC)

Sampling frequency

44.1 kHz

Cording Adaptive Transform Acoustic Cording (ATRAC)

Modulation system

EFM (Eight-to-Fourteen Modulation)

Number of programme positions

2 stereo programme positions

Frequency response

20 – 20,000 Hz +1 /–2 dB

Signal-to-noise ratio

Over 80 dB (during playback)

Wow and flutter

Below measurable limit

Outputs

Headphones jack (stereo minijack) (2) : For 32 ohms

impedance headphones

Power outputs

7 W + 7 W

Power requirements

For personal minidisc system :

US Model :120V AC, 60Hz

EXCEPT US Model :230V AC, 50Hz

For remote commander :

3V DC, 2 size AA (R6) batteries

Power consumption

30 W

Dimensions (incl. projecting parts)

Approx. 528 x 275 x 139 mm (w/h/d)

(20 7 / 8 x 10 7 / 8 x 5 1 / 2 inches)

Mass approx. 6.4 kg (14 lb. 2 oz)

Supplied accessories

Remote commander (1)

AM loop aerial (1) (US Model)

MW/LW loop aerial (1) (EXCEPT US Model)

Speaker nets (2) (EXCEPT US Model)

General

Speaker

Full range : 8 cm (3 in.) dia., 4ohms, cone type (2)

Inputs

Design and specifications are subject to change without notice.

LINE IN (stereo minijack) : Sensitivity 436 mV/691 mV

TABLE OF CONTENTS

Specifications ........................................................................... 1

5-6. Laser Power Adjustment ........................................... 33

5-7. Traverse Adjustment ................................................. 33

5-8. Focus Bias Adjustment ............................................. 34

5-9. Error Rate Check ...................................................... 35

5-10. Focus Bias Check ................................................... 35

5-11. Adjustment and Connection Locations ................... 35

1. SERVICE NOTE ........................................................... 3

2. GENERAL ...................................................................... 5

3. DISASSEMBLY

3-1. Cabinet (Front) ASSY, Cabinet (Rear) ASSY .......... 21

3-2. Left Key Board, Front Key Board, Top Key board,

Right Key Board, Relay Board ................................. 22

3-3. FL Board, Trans Board ............................................. 22

3-4. Tuner Board, FM ANT Board, AM ANT Board ....... 23

3-5. MD Chassis ASSY ................................................... 23

3-6. MD Block ASSY, Filter Board ................................. 24

3-7. Audio Board, HP Board, Line in Board .................... 24

3-8. Main Board, CD Block ASSY .................................. 25

3-9. Shield Case (Top), Shield Case (Bottom) ................. 25

3-10. DG Board, BD Board, MD Mechanism Deck ........ 26

3-11. Shutter ASSY .......................................................... 26

3-12. SW Board ............................................................... 27

3-13. Slider ASSY, “Head, Over Write” .......................... 27

3-14. MD Optical Pick-up Block ..................................... 28

3-15. Loading Board, “Tray ASSY, CD” ......................... 29

3-16. CD Optical Pick-up Block, Pick-up Relay Board .. 29

6. DIAGRAMS

6-1. Explanation of IC Terminals ..................................... 39

6-2. Block Diagram (1) .................................................... 46

6-3. Block Diagram (2) .................................................... 49

6-4. Printed Wiring Boards –Main Section – ................... 55

6-5. Schematic Diagram –Main Section (1/2) – .............. 59

6-6. Schematic Diagram –Main Section (2/2) – .............. 63

6-7. Printed Wiring Boards

–Tuner Section (US Model) – .................................. 67

6-8. Schematic Diagram

–Tuner Section (US Model) – ................................... 69

6-9. Printed Wiring Boards

–Tuner Section (EXCEPT US Model) – ................... 72

6-10. Schematic Diagram

–Tuner Section (EXCEPT US Model) – .................. 74

6-11. Schematic Diagram –BD Section – ........................ 77

6-12. Printed Wiring Boards –BD Section – .................... 79

6-13. Schematic Diagram –Power Section – ................... 82

6-14. Printed Wiring Boards –Power Section – ............... 85

6-15. Schematic Diagram –DG Section – ........................ 87

6-16. Printed Wiring Boards –DG Section – ................... 90

6-17. Printed Wiring Boards –Front Key Section – ......... 93

6-18. Schematic Diagram –Front Key Section – ............. 97

4. TEST MODE

4-1. Caution When Using the Test Mode ......................... 30

4-2. Test Mode Settings ................................................... 30

4-3. Releasing the Test Mode ........................................... 30

4-4. Basic Operations of the Test Mode ........................... 30

4-5. Selecting the Test Mode ............................................ 30

4-6. Functions of Other Buttons ...................................... 31

4-7 Test Mode Display ..................................................... 31

7. EXPLODED VIEWS

7-1. Front Cabinet Section ............................................. 106

7-2. Rear Cabinet Section .............................................. 107

7-3. Chassis Section ....................................................... 108

7-4. MD Section (1) ....................................................... 109

7-5. MD Section (2) ........................................................ 110

7-6. CD Section ............................................................... 111

7-7. Optical Pick-up Section ........................................... 112

5. ADJUSTMENTS

5-1. Cautions When Checking Laser Diode Emission ..... 32

5-2. Cautions When Handling

the Optical Pick-up (KSM-260A) ............................ 32

5-3. Cautions During Adjustment .................................... 32

5-4. Creating a Continuous Recording Disk .................... 32

5-5. Temperature Compensation Offset Adjustment ........ 33

8. ELECTRICAL PARTS LIST .................................. 113

– 2 –

SAFETY CHECK-OUT (US Model)

SECTION 1

SERVICE NOTE

After correcting the original service problem, perform the follow-

ing 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.

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK

OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic

breakdown because of the potential difference generated by the

charged electrostatic load, etc. on clothing and the human body.

During repair, pay attention to electrostatic breakdown 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.

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 0.5mA (500 microampers).

Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers’ instructions to use these

instruments.

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 0.75V,

so analog meters must have an accurate low-voltage scale. The

Simpson 250 and Sanwa SH-63Trd are examples of a passive

VOM that is suitable. Nearly all battery operated digital

multimeters that have a 2V AC range are suitable. (See Fig. A)

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, ob-

serve more than 30 cm away from the objective lens.

LASER DIODE AND FOCUS SEARCH OPERATION

CHECK

1. Close the lid for CD.

2. Press CD ^ button.

3. Confirm the laser diode emission while observing the objecting

lens. When there is no emission, Auto Power Control circuit or

Optical Pick-up is broken.

Objective lens moves up and down once for the focus search.

To Exposed Metal

Parts on Set

0.15

1.5k

A voltmeter

(0.75V)

CAUTION DURING WHEN MOUNTING THE PULLEY

FOR THE LOADING MOTOR

Make the following adjustment when mounting the loading motor

(part number : 1-698-999-11) and motor pulley (part number : 2-

627-174-01) of the CD section.

Earth Ground

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

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.

Specification : A = 0.9 to 1.1mm

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ! OR DOTTED 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.

– 3 –

ABOUT THE BD BOARD WAVEFORM CHECKING JIG

The special jig (J-2501-124-A) is highly convenient when check-

ing the waveform of the BD board of the MD section. Pin names

and items to check are as follows:

I+3V : for IOP measurement (check for depleted optical pickup

laser)

IOP : for IOP measurement (check for depleted optical pickup

laser)

TEO : TRK error signal (traverse adjustment)

VC : Standard level for checking signals

RF : RF signal (jitter check)

MD block section

DG board

TEO VC

IOP

BD board

I + 3V

CN110

Jig

(J-2501-124-A)

ABOUT THE HARDWARE RESET

It is possible to reset the system microcomputer by pressing the

RESET button located on the rear with a pointed object. Use this

button when the unit cannot be operated properly due to such prob-

lems as microcomputer errors, etc.

RESET button

– 4 –

LOCATION AND FUNCTION OF CONTROLS

FRONT PANEL : RADIO section

FRONT PANEL : TIMER • COM section

1 CD ( MD SYNCHRO REC button

DISC ALL

REC IT : TO TOP

TO END

2 MD insert section

3 TUNE–, + • 0 , ) • õ , º button

4 EDIT button

5 DELETE button

6 INSERT button

7 AUTO PRESET•SHUF/PGM button

8 LINE LEVEL•MONO/ST•REPEAT button

9 ENTER•YES button

!¼ Jog dial

= / + AMS

PRESET

!Á CANCEL•NO button

!ª 6 MD EJECT button

!£ 6 CD OPEN/CLOSE button

!¢ CD operation buttons

^ (play/pause)

p (stop)

!° CD tray

!¤ BAND button

!¦ MD operation button

^ (play/pause)

p (stop)

!¥ REC button

!» POWER button (US MODEL)

OPERATE button (EXCEPT US MODEL)

@¼ SLEEP button

@Á STANDBY button

@ª TIMER button

@£ CLOCK button

@¢ Display window

@° BASS/TREBLE button

@¤ MEGA BASS button

@¦ VOLUM –, + button

@¥ DISPLAY button

@» 2 (Headphones) Jack (stereo mini jack)

#¼ LINE button

#Á Remote control receiver section

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