Yamaha Dvd-c940 User manual

100873

SERVICE MANUAL

DVD PLAYER

This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.

It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are

already known and understood by the users, and have therefore not been restated.

WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in

personal injury, destruction of expensive components, and failure of the product to perform as specified.

For these reasons, we advise all YAMAHA product owners that any service required should be performed

by an authorized YAMAHA Retailer or the appointed service representative.

IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute authorization, certifi-

cation or recognition of any applicable technical capabilities, or establish a principle-agent relationship

of any form.

The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering,

and service departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore,

inevitable and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to

exist, please contact the distributor's Service Division.

WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may have

accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this

buss).

IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to

the unit.

IMPORTANT NOTICE

DVD-C940/DV-C6680

SERVICE MANUAL

■CONTENTS

TO SERVICE PERSONNEL .....................................2–3

PREVENTION OF ELECTROSTATIC DISCHARGE ...4

LOCALE MANAGEMENT INFORMATION ..................4

FRONT PANELS ........................................................... 5

REAR PANELS .............................................................6

SPECIFICATIONS .........................................................7

DIMENSIONS ................................................................8

INTERNAL VIEW .......................................................... 8

DISASSEMBLY PROCEDURES ............................9–10

DIAGNOSTIC SOFTWARE................................... 11–19

SERVICE NOTE ..........................................................19

IC DATA ................................................................20–25

BLOCK DIAGRAM ......................................................26

WIRING DIAGRAM .....................................................27

PRINTED CIRCUIT BOARD .................................28–40

SCHEMATIC DIAGRAM .......................................41–63

PARTS LIST .......................................................... 64–74

DVD-C940

/DV-C6680

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DVD-C940/DV-C6680

DVD-C940

/DV-C6680

■TO SERVICE PERSONNEL

1. Critical Components Information

Components having special characteristics are marked Z

and must be replaced with parts having specifications equal

to those originally installed.

2. Leakage Current Measurement (For 120V Models Only)

When service has been completed, it is imperative to verify

that all exposed conductive surfaces are properly insulated

from supply circuits.

●Meter impedance should be equivalent to 1500 ohm shunted

by 0.15µF.

●Leakage current must not exceed 0.5mA.

●Be sure to test for leakage with the AC plug in both

polarities.

AC LEAKAGE

TESTER OR

EQUIVALENT

EQUIPMENT

UNDER TEST

INSULATING

TABLE

WALL

OUTLET

WARNING: Laser Safety

This product contains a laser beam component. This component may emit invisible, as well as visible radiation,

which may cause eye damage. To protect your eyes and skin from laser radiation, the following precautions must

be used during servicing of the unit.

1) When testing and/or repairing any component within the product, keep your eyes and skin more than 30 cm away from

the laser pick-up unit at all times. Do not stare at the laser beam at any time.

2) Do not attempt to readjust, disassemble or repair the laser pick-up, unless noted elsewhere in this manual.

3) CAUTION : Use of controls, adjustments or performance of procedures other than those specified herein may result in

hazardous radiation exposure.

WARNING: CHEMICAL CONTENT NOTICE!

The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or

plastic (where applicable) components may also contain traces of chemicals found by the California Health and

Welfare Agency (and possibly other entities) to cause cancer and/or birth defects or other reproductive harm.

DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR

ANY REASON WHATSOEVER!

Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes

or expose eyes to solder/flux vapor!

If you come in contact with solder or components located inside the enclosure of this product, wash your hands

before handling food.

Laser Emitting conditions:

1) When the Top Cover is removed, and the STANDBY/ON SW is turned to the "ON" position, the laser component will

emit a beam for several seconds to detect if a disc is present. During this time (5-10 sec.) the laser may radiate through

the lens of the laser pick-up unit. Do not attempt any servicing during this period!

If no disc is detected, the laser will stop emitting the beam. When a disc is loaded, you will not be exposed to any laser

emissions.

2) The laser power level can be adjusted with the VR on the pick-up PWB, however, this level has been set by the factory

prior to shipping from the factory. Do not adjust this laser level control unless instruction is provided elsewhere in this

manual. Adjustment of this control can increase the laser emission level from the device.

THE DVD AUDIO/VIDEO PLAYER SHOULD NOT BE ADJUSTED OR REPAIRED BY ANYONE EXCEPT PROPERLY QUALIFIED

SERVICE PERSONNEL.

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DVD-C940/DV-C6680

DVD-C940

/DV-C6680

Laser Diode Properties

Type: Semiconductor laser GaAlAs

Wave length: 650 nm (DVD)

780 nm (VCD/CD)

Output Power: 7 mW (DVD)

10 mW (VCD/CD)

Beam divergence: 60 degree

VARO! : AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALTTIINA NÄKYMÄTTÖMÄLLE

LASER-SÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN.

VARNING! : OSYNLIG LASERSTRÅLNING NÄR DENNA DEL ÄR ÖPPNAD OCH SPÄRREN ÄR URKOPPLAD.

BETRAKTA EJ STRÅLEN.

Optical pick-up

CLASS 1 LASER PRODUCT

LASER KLASSE 1 PRODUKT

LUOKAN 1 LASERLAITE

KLASS 1 LASER APPARAT

PRODUIT LASER DE CLASSE 1

CAUTION

VISIBLE AND INVISIBLE LASER RADIATION WHEN

OPEN. AVOID EXPOSURE TO BEAM

ADVARSEL

SYNLIG OG USYNLIG LASERSTRÅLING VED ÅBNING

UNDGÅ UDSÆTTELSE FOR STRÅLING

ADVARSEL

SYNLIG OG USYNLIG LASERSTRÅLING NÅR DEKSEL

ÅPNES UNNGÅ EKSPONERING FOR STRÅLEN

VARNING

SYNLIG OCH OSYNLIG LASERSTRÅLNING NÄR

DENNA DEL ÄR ÖPPNAD BETRAKTA EJ STRÅLEN

VARO !

AVATTAESSA OLET ALTTIINA NÄKYVÄLLE JA

NÄKYMÄTTÖMÄLLE LASER SÄTEILYLLE, ÄLÄ KATSO SÄTEESEEN

VORSICHT

SICHTBARE UND UNSICHTBARE LASERSTRAHLUNG

WENN ABDECKUNG GEÖFFNET NICHT DEM STRAHL AUSSETSEN

DANGER

VISIBLE AND INVISIBLE LASER RADIATION WHEN

OPEN AVOID DIRECT EXPOSURE TO BEAM

ATTENTION

RAYONNEMENT LASERVISIBLE ET INVISIBLE EN

CAS D'OUVERTURE EXPOSITION DANGEREUSE AU FAISCEAU

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DVD-C940/DV-C6680

DVD-C940

/DV-C6680

■PREVENTION OF ELECTROSTATIC DISCHARGE

■LOCALE MANAGEMENT INFORMATION

Locale Management Information : This DVD player is designed and manufactured to respond to the Locale

Management Information that is recorded on a DVD disc. If the Locale number described on the DVD disc does not

correspond to the Locale number of this DVD player, this DVD player cannot play this disc.

This product incorporates copyright

protection technology that is protected by

method claims of certain U.S. patents and

other intellectual property rights owned by

Macrovision Corporation and other rights

owners. Use of this copyright protection

technology must be authorized by

Macrovision Corporation, and is intended

for home and other limited viewing uses

only unless otherwise authorized by

Macrovision Corporation. Reverse

engineering or disassembly is prohibited.

The laser diode in the traverse unit (optical pickup) may be damaged due to static electricity from clothes or the human

body. Use caution to prevent electrostatic damage when servicing or handling the laser diode.

1. Grounding for electrostatic damage prevention

1. Worktable grounding

Put a grounded conductive material (sheet) or iron sheet on the area where the optical pickup is placed.

2. Human body grounding

Use an anti-static wrist strap to discharge the static electricity from your body.

2. Handling of the optical pickup

1. To prevent damage to the optical pickup replacement parts during transportation and before installation, both ends

of the laser diode are short-circuited. After installing the new part, remove the short circuit according to the correct

procedure in this service manual.

2. Do not use a tester to check the laser diode in the optical pickup. The power supply in the tester will damage the

laser diode.

3. Handling Precautions for the Traverse Unit (Optical Pickup)

1. Handle the traverse unit (optical pickup) gently, as it is an extremely high-precision assembly.

2. The flexible cable lines may break if an excessive force is applied to it. Use caution when handling the cable.

3. The semi-fixed resistor for laser power adjustment should not be adjusted. Do not turn the resistor.

1MΩ

Conductive material

(sheet) or steel sheet

Anti-static wrist strap

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DVD-C940/DV-C6680

DVD-C940

/DV-C6680

■FRONT PANELS

▼DVD-C940 (U model)

▼DV-C6680 (U model)

● DVD-C940/DV-C6680

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DVD-C940/DV-C6680

DVD-C940

/DV-C6680

■REAR PANELS

▼DVD-C940 U model

▼DV-C6680 U model

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DVD-C940/DV-C6680

DVD-C940

/DV-C6680

PLAYBACK SYSTEM

DVD Video

SACD multichannel and SACD stereo

DVD+RW

DVD+R

Video CD and SVCD

CD (CD-R and CD-RW)

MP3 CD

TV STANDARD (PAL/50Hz) (NTSC/60Hz)

Number of lines 625 525

Playback Multistandard (PAL/NTSC)

VIDEO PERFORMANCE

Component video output Y: 1Vpp into 75 ohm

Pr/Cr Pb/Cb: 0.7Vpp into 75 ohm

S-Video output Y: 1Vpp into 75 ohm

C: 0.3Vpp into 75 ohm

Video output 1 Vpp into 75 ohm

Black Level Shift On/Off

Video Shift Left/Right

AUDIO FORMAT

DSD Multichannel and Stereo

Dolby Digital/ Compressed Digital

DTS/MPEG

PCM 16, 20, 24 bits

fs, 44.1, 48, 96 kHz

MP3 96, 112, 128, 256 kbps and

(Joliet) variable bit rate fs 32, 44.1, 48kHz

Full decoding of Dolby Digital and DTS multi channel sound

Analog Stereo Sound

Dolby Surround-compatible downmix from Dolby Digital

multi-channel sound

3D Sound for virtual 5.1 channel sound on 2 speakers

SACD AUDIO PERFORMANCE

D/A Converter DSD

SACD fs 2.8224MHz DC - 100kHz

Max. output voltage (0dB) 2V rms

Channel unbalance <0.5 dB

Cut-off frequency 50 kHz (Front)

40 kHz (Surround, Center,

Subwoofer)

Signal-Noise (1kHz) 105 dB

Dynamic Range (1kHz) 100 dB

Harmonic Distortion + Noise (1kHz) 0.0025%

AUDIO PERFORMANCE

DA Converter 24 bits

DVD fs 96 kHz 2 Hz - 44 kHz

fs 48 kHz 2 Hz - 22 kHz

CD/Video CD fs 44.1 kHz 2 Hz - 20 kHz

S-Video CD fs 48 kHz 2 Hz - 22 kHz

fs 44.1 kHz 2 Hz - 20 kHz

Signal-Noise (1kHz) 110 dB

Dynamic Range (1kHz) 100 dB

Harmonic Distortion + Noise (1kHz) 0.0025%

MPEG MP3 MPEG Audio L3

CONNECTIONS

Y Pb/Cb Pr/Cr (480i/p) Cinch 3x (green, blue, red)

S-Video Output Mini DIN, 4 pins

Video Output Cinch (yellow)

Audio L+R output Cinch (white/red)

Digital Output 1 coaxial, 1 optical

IEC958 for CDDA / LPCM

IEC1937 for MPEG1/2, Dolby

Digital, DTS

Remote Control In/Out Mini jack, Mono

RS-232C D-sub, 9 pins

6 channel analog output

Audio Front L/R Cinch (white/red)

Audio Surround L/R Cinch (white/red)

Audio Center Cinch (blue)

Audio Subwoofer Cinch (black)

CABINET

Dimensions (w x h x d) 435 x 116 x 425 mm

(17-1/8" x 4-9/16" x 16-3/4")

Weight Approx. 6 Kg (13 lbs 3 oz)

POWER SUPPLY

Power input 120V, 60Hz

Power usage Approx. 24W

Power usage standby < 5W

Finish

DVD-C940 Black color (U model)

DV-C6680 Black color (U model)

Accessories Remote Control, Batteries, Audio/Video Cable

* typical playing time for movie with 2 spoken languages and 3

subtitle languages

Specifications subject to change without prior notice

Manufactured under license from Dolby Laboratories.

“Dolby”, “Pro Logic”and the double-D symbol are trademarks of

Dolby Laboratories.

Manufactured under license from Digital Theater Systems, Inc.

US Pat. No.5,451,942, 5,956,674, 5,974,380, 5,978,762 and

other world-wide patents issued and pending. “DTS”and “DTS

Digital Surround”are registered trademarks of Digital Theater

“DCDi”is a trademark of Faroudia, a division of Sage Inc.

■SPECIFICATIONS

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DVD-C940/DV-C6680

DVD-C940

/DV-C6680

Unit : mm (inch)

435 (17-1/8")

116

(4-9/16") 425 (16-3/4")

■INTERNAL VIEW

qPOWER SUPPLY UNIT

wRS-232C P.C.B.

eCM UNIT

rCLAMPER ASS’Y

tAV P.C.B.

yP-SCAN P.C.B.

uTRAY ASS’Y

iMONO BOARD P.C.B.

■DIMENSIONS

r t yq w e

u i

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DVD-C940/DV-C6680

■DISASSEMBLY PROCEDURES

See exploded view for item numbers Mounting

Dismounting

A/V board 1001

➔Remove flex and cable

connections.

➔Remove 4 screws 275

(skt cinch ,optical to back-

plate) and screw 280.

(S-video to back-plate)

➔Release 2 screw 190.

(board to bracket)

➔Dismount board.

Front Standby board 2000 (3)

➔Remove 2 screws 110.

(Board to Front cabinet)

➔Remove cable connection.

➔Dismount board.

Shield Plate

➔Remove 3 screws 0120.

➔Remove Shield Plate.

Front Display board 2000 (1)

➔Remove 8 screws 100.

(Board to Front cabinet)

➔Remove cable connections.

➔Dismount board.

Front Panel 0001

➔Remove cable connection.

➔Unlock Front panel from frame by

releasing successively 4 snaps.

(2 on the side and bottom)

➔Place Front panel in front of

the set ( service position ).

Top Cover 300

➔Remove 4 screws 310 and

3 screws 305

➔Lift top cover from rear side

to remove.

Power supply unit 1005

➔Remove cable connections.

➔Remove 2 screws 185.

(Board to bottom frame)

➔Release spacer locking.

(Board to bottom frame)

➔Dismount board.

RS-232C board 1111

➔Remove cable connections.

➔Remove 2 screws 265 and

screw 270.

(Board to Rear Panel)

➔Release 2 spacers locking.

(Board to bottom frame)

➔Dismount board.

Monoboard 1020

➔Remove flex and cable

connections from Changer

module to Monoboard.

➔Remove 4 screws 200.

➔Dismount Monoboard.

P-scan board 1003

➔Open Tray

(See instruction for manual

eject of tray)

➔Removes flex connection.

➔Remove screw 275

(skt cinch to back-plate) and

screw 195 (board to bracket)

➔Dismount board

Front Eject board 2000 (2)

➔Remove 3 screws 115.

(Board to Front cabinet)

➔Remove cable connection.

➔Dismount board.

Tray Ass’y

➔Removes stopper screw 10 on

the Tray.

➔Open Tray

(See instruction for manual

eject of tray)

➔Gently pull the tray out.

CM Unit

➔Remove P-scan board 1003,

AV board 1001 and

Monobaord 1020.

➔Remove 5 screws 150.

(CM module to bottom frame)

➔Dismount CM uni

Clamper Ass’y 0004

➔Remove 2 screws 12.

(Clamper to CM unit )

➔Dismount clamper ass’y.

Holder/VAM Ass’y

➔Remove 2 screws 11.

(Holder/VAM Ass’y to CM

unit)

➔Dismount holder /VAM ass’y.

Motor driver board 1021

➔Flip the CM unit.

➔Release 3 catches.

➔Remove cable connections

➔Dismount board.

1.7 mm

2.7 mm

T10

3.8 mm

T20

When disassembling, use the special screw driver with

tip shape in figure.

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DVD-C940/DV-C6680

Top Cover

Tray

HOW TO MANUALLY EJECT THE TRAY

1. Remove the Top Cover.

2. Move the gear in the anti-clockwise direction

with your finger until the tray is ejected.

3. Gentlely pull the tray out.

Fig. 2

Fig. A

●Precaution for installation of the Tray Ass'y.

On Tray Ass'y setting.

Check the Direction of marking “▲” on gear

according to this drawing.

Gear/L0

Front Panel

Gear/L01 Marking

1. Removal of Tray Ass'y

a. Remove 1 screw ( r ) in Fig. 1.

b. Turn Gear/L0 as shown in Fig. 2 counter clockwise

gradually until immediately before the tray starts to

move and stop it there.

CAUTION: Gear/L0, if turned counter clockwise con-

tinuously, will mesh with the gear of the tray

and the tray will come out. When removing

the tray, use care so that Gear/L0 will not

mesh with the gear of the tray.

c. Pull out the Tray Ass'y.

Tray

Gear/L0

Fig. 1

2. Removal of Table

a. Remove 2 screws ( t ) and then remove the

Support/M in Fig. 3.

b. Remove the Plate/Table in Fig. 3.

c. Remove 1 screw ( y ) and then take off the Table in

Fig. 3.

IMPORTANT: Installation of Table.

Install the table according to the following procedure.

1) Slide the Lever so that the Gear/RT becomes

free. (Fig.B)

2) With the “▲” mark on the Gear/RT aligned

with the same mark on the Tray, lock it with

the Lever. (Fig.B)

3) Install the Table by aligning it to the thick line

on “ /” mark. (Fig.3)

*Check that the Table is locked after installation.

Lever

Tray

Gear/RT1 Fit the Gear/RT to “▲” mark.

Fig. B

Fit the table to the thick line on “ /” mark.

Plate/Table

Fig. 3

Table

Lock

Unlock

Support/M

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