Panasonic SA-HT640WP, SA-HT640WPC, SB-W640, SB-SA640, SB-PC640 Service Manual

...

ORDER NO.MD0512492C1

DVD Home Theater Sound System

SA-HT640WP SA-HT640WPC

Colour

(S).......................Silver Type

Specifications

lGeneral

Power Source:

Power consumption: 85 W

Dimensions (W×H×D): 430×70×439.2 mm

Mass:

lAmplifier section

RMS Output Power: Dolby Digital Mode

lTotal RMS Dolby Digital

mode Power:

At 1kHz and total harmonic of 10%

lFront: 110 W/ Channel (3Ω)

lCenter: 225 W/ Channel (6Ω)

lSurround: 90 W/ Channel (4Ω)

At 100Hz and total harmonic of 10%

lActive subwoofers: 225 W/ Channel (6Ω)

FTC Output Power: Dolby Digital Mode

lTotal FTC Dolby Digital mode Power:

At 120Hz-20kHz and total harmonic of 1%

lFront: 40 W/ Channel (3Ω)

lCenter: 75 W/ Channel (6Ω)

lSurround: 40 W/ Channel (4Ω)

C 120V, 60Hz

(16-15/16”×2-3/4”×17-19/64”)

4.65 kg (10.25Ibs)

850 W

300 W

At 45Hz-120Hz and total harmonic of 1%

lSubwoofer: 65 W/ Channel (6Ω)

lFM tuner section

Preset Memory:: FM 15 stations

AM/MW 15 stations

Frequency Range:

Sensitivity: 2.5µV (IHF)

S/N 26dB

Antenna Terminals: 75Ω (unbalanced)

lAM tuner section (AM/MW)

Frequency Range: 520-1710kHz (10kHz in step)

AM Sensitivity S/N 20dB at 1000kHz:

lPhone Jack:

Terminal: Stereo 3.5 mm (1/8”) jack

lFront/Rear M. Port:

Sensitivity: 100mV (4.7kΩ)

Terminal (Input): Stereo 3.5 mm (1/8”) jack

lDisc section

Discs played [8 cm (3”) or 12 cm (5”)]:

87.9-107.9MHz

(200kHz in step)

87.5-108.0MHz

(100kHz in step)

2.2µV

560µV/m

SA-HT640WP / SA-HT640 WPC

(1) DVD [DVD-Video, DVD-Audio]

(2) DVD-RAM [DVD-VR, JPEG(*4,5)]

(3) DVD-R [DVD-Video]

(4) DVD-RW [DVD-Video]

(5) +R/+RW [Video]

(6) CD, CD-R/RW [CD-DA, Video CD, SVCD(*1), MP3(*2,5),

WMA(*3,5), JPEG(*4,5), HighMAT Level 2 (Audio and Image)]

*1 Conforming to IEC62107

*2 MPEG-1 Layer 3, MPEG-2 Layer 3

*3 Windows Media Audio Ver.9.0 Class 2A

lNot compatible with Multiple Bit Rate (MBR)

*4 Exif Ver 2.1 JPEG Baseline files

lPicture resolution: between 320 x 240 and 6144 x 4096 pixels (Sub sampling is 4:2:2 or 4:2:0). Extremely long and thin pictures may not be displayed.

*5 The total combined maximum number of recognizable audio

and picture contents and groups: 4000 audio and picture contents and 400 groups.

Pick up:

Wavelength:

lCD: 785nm

lDVD: 662nm

Laser power:

lCD: CLASS I

lDVD: CLASS II

Audio output (DISC):

Number of channels:

Audio performance:

Frequency response:

DVD (linear audio):

DVD-Audio: 4 Hz-88 kHz (192 kHz

CD-Audio: 4 Hz-20 kHz

S/N ratio:

CD-Audio: 105 dB

Dynamic range:

DVD (linear audio):

CD-Audio: 95 dB

Total harmonic distortion:

CD-Audio:

lVideo section

ideo system:

Signal system: NTSC

Composite video output:

Output level: 1 Vp-p (75 Ω )

Terminal: Pin jack (1 system)

S-video output:

output level: 1 Vp-p (75 Ω)

C output level: NTSC; 0.286 Vp-p (75 Ω )

Terminal S terminal (1 system)

Component video output (480p/480i):

output level: 1 Vp-p (75 Ω)

5.1 ch (FL, FR, C, SL, SR, SW)

4 Hz-22 kHz (48 kHz sampling)

4 Hz-44 kHz (96 kHz sampling)

sampling)

95 dB

0.005 %

PBoutput level: 0.7 Vp-p (75 Ω )

PRoutput level: 0.7 Vp-p (75 Ω )

Terminal: Pin jack (Y: green, PB: blue,

: red) (1 system)

Power consumption in standby mode:

approx 0.4W

Note:

1. Specifications are subject to change without notice.

Mass and dimensions are approximate.

2. Total harmonic distortion is measured by the digital spectrum analyzer.

Solder:

This model uses lead free solder (PbF).

Mechanism:

This model uses RC1 (Rotary tray) mechanism.

Refer to the original service manual for *1, *2, *3, *4.

SA-HT640WP / SA-HT640 WPC

CONTENTS

Page Page

1 Safety Precautions 5

1.1. GENERAL GUIDELINES

1.2. Before Repair and Adjustment

1.3. Protection Circuitry

2 Prevention of Electro Static Discharge (ESD) to

Electrostatically Sensitive (ES) Devices

3 Precaution of Laser Diode

4 About Lead Free Solder (PbF)

5 Handling Precautions for Traverse Unit

5.1. Cautions to Be Taken in Handling the Optical Pickup Unit

5.2. Grounding for electrostatic breakdown prevention

6 Accessories

7 Operation Procedures

7.1. Operating instructions

7.2. Disc information

8 New Features

8.1. RF Wireless Audio Transceiver

8.2. Detail Block Diagram (Receiver module)

8.3. Class-D Amplifier

9 Self-Diagnosis and special mode setting

9.1. Service Mode Summary Table

9.2. Service Mode Table 1

9.3. DVD Self Diagnostic Function-Error Code

9.4. Sales Demonstration Lock Function

9.5. Service Precautions

10 Assembling and Disassembling

10.1. Disassembly Flow Chart

10.2. Main Components and P.C.B. Locations

10.3. Disassembling the Top Cabinet

10.4. Disassembling the Front Panel Assembly

10.5. Disassembling the Tray Assembly

10.6. Disassembling the Rear Panel

10.7. Disassembling the Mechanism Base Assembly

10.8. Disassembling the FL & Head phone P.C.B.

10.9. Disassembling the Main P.C.B.

10.10. Disassembling the AC Inlet, Power & Sub power P.C.B

10.11. Disassembly of Digital Amp IC

10.12. Disassembly of Regulator IC

10.13. Disassembly of Switch Regulator IC (IC5701)

10.14. Disassembly of the Tray Base Guide (L) and Tray Base

Guide (R)

10.15. Disassembly of the Rotary Tray

10.16. Disassembly of the Traverse Unit

10.17. Assembly of Tray Assembly

11 Service Fixture and Tools

12 Service Positions

12.1. Checking & Repair Main P.C.B., Power P.C.B., FL and

Head phone P.C.B.

12.2. Checking & Repair DVD Module P.C.B

13 Measurements and Adjustments

13.1. Service Tools and Equipment

13.2. Important points in adjustment

13.3. Storing and handling of test discs

13.4. Optical adjustment

13.5. Abbreviations

14 Voltage and Waveform Chart

14.1. DVD Module P.C.B.

14.2. Main P.C.B.

14.3. Power P.C.B.

14.4. FL P.C.B.

14.5. Loading Motor P.C.B., Tray Motor P.C.B., Sensor P.C.B.

14.6. Waveform Chart

15 Illustration of IC's, Transistors and Diodes

16 Wiring Connection Diagram

17 Block Diagram

18 Schematic Diagram

18.1. (A) DVD Module Circuit

18.2. (B) Main Circuit

18.3. (C) Power Circuit

18.4. (D) FL and Headphone Circuit

18.5. (E) Loading Motor, Tray Motor and Sensor Circuit

19 Printed Circuit Board

19.1. (A) DVD Module P.C.B.

19.2. (B) Main, AC-Inlet & Sub Power P.C.B.

19.3. (C) Power P.C.B.

19.4. (D) FL, Headphone, Loading motor, Tray motor, Sensor

and Regulator P.C.B.

20 Basic Troubleshooting Guide

20.1. Basic Troubleshooting Guide for DVD Module

20.2. Basic Troubleshooting Guide for Traverse Unit

20.3. Troubleshooting Guide for Wireless Surround Speaker

(SB-SA640)

21 Overall Block Diagram for HT640

21.1. SC-HT640 DVD Unit Block Diagram

21.2. HT640 Block Diagram (Analog Signal : DVD 5.1ch Play

Back Mode)

21.3. Service parts replacement

22 Terminal Function of ICs

22.1. IC2001 (MN101C49GHG): Micro-processor IC

100

103

SA-HT640WP / SA-HT640 WPC

23 Explode Views 104

23.1. Cabinet Parts Location

23.2. Packaging

104

107

24 Replacement Parts List

24.1. Component Parts List

108

109

SA-HT640WP / SA-HT640 WPC

1 Safety Precautions

1.1. GENERAL GUIDELINES

1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit.

2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly installed.

3. After servicing, carry out the following leakage current checks to prevent the customer from being exposed to shock hazards.

1.1.1. LEAKAGE CURRENT COLD CHECK

1. Unplug the AC cord and connec t a jumper between the two prongs on the plug.

2. Measure the resistance value, with an ohmmeter, between the jumpered AC plug and each exposed metallic cabinet part on the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic part has a return path to the chassis, the reading should be between 1MΩ and 5.2MΩ. When the exposed metal does not have a return path to the chassis, the reading must be

Figure 1

1.1.2. LEAKAGE CURRENT HOT CHECK (See Figure 1.)

1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.

2. Connect a 1.5kΩ, 10 watts resistor, in parallel with a 0.15µF capacitors, between each exposed metallic part on the set and a good earth ground such as a water pipe, as shown in Figure 1.

3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potential across the resistor.

4. Check each expose d metallic part, and measure the voltage at each point.

5. Reverse the AC plug in the AC outlet and repeat each of the above measurements.

6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equivalent) may be used to make the hot checks, leakage current must not exceed 1/2 milliamp. In case a measurement is outside of the limits specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to the customer.

1.2. Before Repair and Adjustment

Disconnect AC power, discharge Power Supply Capacitors C5700, C5717, C5718, C5742, C5796 through a 10 Ω, 10 W resistor to ground.

DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices.

After repairs are completed, restore power gradually using a variac, to avoid overcurrent.

Current consum ption at AC 120 V, 60 Hz in NO SIGNAL mode volume minimal should be ~ 900 mA.

SA-HT640WP / SA-HT640 WPC

1.2.1. Caution for fuse replacement

1.3. Protection Circuitry

The protection circuitry may have operated if either of the following conditions are noticed:

· No sound is heard when the power is turned on.

· Sound stops during a performance.

The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are

“shorted”, or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.

If this occurs, follow the procedure outlines below:

1. Turn off the power.

2. Determine the cause of the problem and correct it.

3. Turn on the power once again after one minute.

Note:

When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.

2 Prevention of Electro Static Discharge (ESD) to

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by electro static discharge (ESD).

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your body by touchin g a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap, which should be removed for potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static (ESD protected)" can generate electrical charge sufficie nt to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed.

Caution

Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) sufficient to damage an ES device).

SA-HT640WP / SA-HT640 WPC

3 Precaution of Laser Diode

CAUTION:

This unit utilizes a class 1 laser.

Invisible laser radiation is emitted from the optical pickup lens.

Wavelength: 662nm(DVD)/785nm(CD).

Maximum output radiation power from pickup: 100µW/VDE

When the unit is turned on:

1. Do not look directly into the pick up lens.

2. Do not use optical instruments to look at the pick up lens.

3. Do not adjust the preset variable resistor on the pickup lens.

4. Do not disassemble the optical pick up unit.

5. If the optical pick up is replaced, use the manufacturer’s specified replacement pick up only.

6. Use of control or adjustments or performance of procedures other than those specified herein may result in hazardous

radiation exposure.

4 About Lead Free Solder (PbF)

Distinction of PbF PCB: PCBs (manufactured) using lead free solder will have a PbF stamp on the PCB.

Caution:

· Pb free solder has a higher melting point than standard solder; Typically the melting point is 50 - 70°F (30 - 40°C) higher.

Please use a high temperature soldering iron. In case of the soldering iron with temperature control, please set it to 700 ± 20°F (370 ± 10°C).

· Pb free solder will tend to splash when heated too high (about 1100°F/ 600°C).

When soldering or unsoldering, please completely remove all of the solder on the pins or solder area, and be sure to heat the soldering points with the Pb free solder until it melts enough.

SA-HT640WP / SA-HT640 WPC

5 Handling Precautions for Traverse Unit

The laser diode in the optical pickup unit may break down due to static electricity of clothes or human body. Special care must be taken avoid caution to electrostatic breakdown when servicing and handlin g the laser diode.

5.1. Cautions to Be Taken in Handling the Optical Pickup Unit

The laser diode in the optical pickup unit may be damaged due to electrostatic discharge generating from clothes or human body. Special care must be taken avoid caution to electrostatic discharge damage when servicing the laser diode.

1. Do not give a considerable shock to the optical pickup unit as it has an extremely high-precise structure.

2. To prevent the laser diode from the electrostatic discharge damage, the flexible cable of the optical pickup unit removed should be short-circuited with a short pin or a clip.

3. The flexible cable may be cut off if an excessive force is applied to it. Use caution when handling the flexible cable.

4. The antistatic FPC is connected to the new optical pickup unit. After replacing the optical pickup unit and connecting the flexible cable, cut off the antistatic FPC.

5.2. Grounding for electrostatic breakdown prevention

Some devices such as the DVD player use the optical pickup (laser diode) and the optical pickup will be damaged by static electricity in the working environment. Proceed servicing works under the working environment where grounding works is completed.

5.2.1. Worktable grounding

1. Put a conductive material (sheet) or iron sheet on the area where the optical pickup is placed , and ground the sheet.

5.2.2. Human body grounding

1. Use the anti-static wrist strap to discharge the static electricity form your body.

SA-HT640WP / SA-HT640 WPC

6 Accessories

Remote control

SA-HT640WP / SA-HT640 WPC

AC cord

AM loop antenna

FM indoor antenna

Video Cable

Digital transceiver*

Speaker label

SA-HT640WP / SA-HT640 WPC

7 Operation Procedures

7.1. Operating instructions

7.1.1. Remote Control Key Buttons Operations

Turn the unit on/off

Change the television's video input mode

Television operations Adjust the television volume Select the source

DVD/CD, FM/AM, AUX/FRONT MUSIC P./REAR MUSIC P.

Select disc's title numbers etc./Enter numbers

Select the disc or show disc information

Select preset radio stations

Show a disc top menu or program list

Frame-by-frame/Select or register menu items on the television screen

Show on-screen menu

Cancel

Adjust the volume of the main unit

Basic operations for play

Show a disc menu or play list

Return to previous screen or show the setup menu

SUB WOOFER

LEVEL

QUICK OSD

SLEEP

SFC

FL DISPLA

TEST

C. FOCUS

CD MODE

CH SELECT PLAY MODE

To use functions labelled with

MUTING

Press and hold the button for at least 2 seconds.

7.1.2. Main Unit Key Buttons Operations (SA-HT640W)

SA-HT640WP / SA-HT640 WPC

Standby/on switch [POWER

/I]

Press to switch the unit from on to standby mode or vice versa. In standby mode, the unit is still consuming a small amount of power.

MUSIC PORT

Connect an external device

SURROUND MUSIC

Equalizing the sound

POWER MUSIC SURROUND

PORT

12345

MUSIC

5 DISC SELECTOR

Select the disc tray

TUNE MODE FM MODE

Stop playing/Select the tuning mode Adjust the FM reception condition

MEMORY

Play discs/Memorize the receiving radio stations

/ TUNING

Skip or slow-search play/ Select the radio stations

Display

TUNINGTUNING

MEMORYMEMORY

TUNE MODETUNE MODE

FM MODEFM MODE

OPEN/CLOSE

Open/Close the disc drawer

DISC EXCHANGE

Open the disc drawer to exchange the disc in the play position

OPEN/CLOSE

DISC DISC

SELECTOR

EXCHANGE SKIP

VOLUME

DISC SKIP

Skip to the next disc tray

Phones

onnect headphones

VOLUME

Turn up/down the volume

SELECTOR

DVD/CD FM AM AUX FRONT MUSIC P.

REAR MUSIC P.

Return to DVD/CD

SA-HT640WP / SA-HT640 WPC

7.1.3. Wireless Surround Speaker Key Buttons Operations (SB-SA640)

Wireless selector [WIRELESS ON, OFF] ON

Power indicator

This indicator lights when the unit is plugged into the AC outlet.

AC IN

WIRELESS

MUSIC PORT

OFF

:Select when enjoying audio from the main unit. :Select when enjoying audio from MUSIC PORT

OFF

on the surround speaker.

Lighting Ring

The light goes out when the speaker is

MUSIC PORT

Connect an external device

in standby mode.

Note: Refer to original service manua l (Order No. MD0512492C1) for more information of this unit (SB-SA640).

7.2. Disc information

Discs that can be played

DVD-Video

—

DVD-Audio

DVD-V

DVD-A

DVD-V

Some DVD-Audio Discs contain DVD-Video content.

SA-HT640WP / SA-HT640 WPC

Video CD

VCD

Including SVCD (Conforming to IEC62107).

DVD-RAM

DVD-VR

Recorded with devices using Version 1.1 of the Video Recording Format (a

standard), such as DVD video recorders, DVD video cameras, personal computers, etc.

JPEG

Recorded with Panasonic SD multi cameras or DVD video recorders using the

JPEG

unified video recording

DCF (Design rule for Camera

File System) Standard Version 1.0.

(DVD-Video) (DVD-Video)/

DVD-R

Discs recorded and finalized

(Video) (Video)

—

+R +RW/

Discs recorded and finalized

This unit can play CD-R/RW recorded with the above formats. Close the sessions or finalize recording.

This unit is compatible with HDCD, but does not support the Peak Extend function (a function which expands the

DVD-RW

DVD-V

JPEGMP3 VCDWMA

DVD-V

on DVD video recorders or DVD video cameras.

dynamic range of high-level signals). HDCD-encoded CDs sound better because they are encoded with 20 bits, as compared with 16 bits for all other CDs.

JPEGMP3WMA

This unit also plays HighMAT discs.

WMA

This unit does not support Multiple Bit Rate (MBR: an encoding process for audio content that produces an

audio file encoded at several different bit rates).

A process that allows play on compatible equipment.

It may not be possible to play all the above-mentioned discs in some cases due to the type of disc or condition of the recording.

Discs that cannot be played

DVD-RW version 1.0, DVD-ROM, CD-ROM, CDV, CD-G, SACD, DivX Video Discs and Photo CD, DVD-RAM that cannot be removed from their cartridge, 2.6-GB and 5.2-GB DVD-RAM, and “Chaoji VCD” available on the market including CVD, DVCD and SVCD that do not conform to IEC62107.

To clean discs

Wipe with a damp cloth and then wipe dry.

Disc handling precautions

Do not attach labels or stickers to discs. This may cause disc warping, rendering it unusable. Do not write on the label side with a ball-point pen or other writing instrument. Do not u

se record cleaning sprays, benzine, thinner, liquids which prevent static electricity, or any other solvent. Do not use scratch-proof protectors or covers. Do not use the following discs: – Discs with exposed adhesive from removed stickers or labels

(rented discs, etc). – Discs that are badly warped or cracked. – Irregularly shaped discs, such as heart shapes.

Note about using a DualDisc

The digital audio content side of a DualDisc does not meet the technical specifications of the Compact Disc Digital Audio (CD-DA) format so playback may not be possible. Do not use DualDisc in this unit as it may not possible to insert it correctly and it may get scratched or scraped.

Clean this unit with a soft, dry cloth.

Never use alcohol, paint thinner or benzine to clean this unit. Before using chemically treated cloth, carefully read the instructions that came with the cloth.

Do not use commercially available lens cleaners as they may

cause malfunction. Cleaning of the lens is generally not neccessary

although this depends on the operating environment.

Before moving the unit, ensure the disc trays are empty.

Failure to do so will risk severely damaging the disc and the unit.

the disc after

SA-HT640WP / SA-HT640 WPC

8 New Features

· This model is equipped with the digital transmitter and receiver (SB-SA640 ) to enjoy surround sound wirelessly. For more

information on this model, please refer to the original service manual.

8.1. RF Wireless Audio Transceiver

8.1.1. Block Diagram

8.1.2. Definition

1. ADC : Analog-to-Digital Converter

2. Transceiver : Transmitter-Receiver Device

3. PA : Power Amplifier

4. DAC : Digital-to-Analog Converter

8.1.3. Features

· Crystal Clear CD Quality Stereo Sound

· Highly Robust Forward Error Correction

· 44.1KHz / 48KHz sampling frequency

· Adaptive Frequency Hopping System

· Range (open space) : 100m

SA-HT640WP / SA-HT640 WPC

· Low power consumption

· SNR (for left / right channel analog interface) : 80 dB

· THD : 0.2%

· Compact : 40mm x 80mm

8.2. Detail Block Diagram (Receiver module)

SA-HT640WP / SA-HT640 WPC

8.2.1. Operation

RF signal transmission and reception:

During the receive process, the radio signal is taken from a pair of balanc ed RF I/O pins that feed into the low noise amplifier (LNA). Direct I/Q down conversion and on-chip filtering send the processed I/Q data to the analog-to-digital converter before processing by the GFSK (Gaussian Frequency Shift Keying) demod ulator. Within the demodulator, data detection and timing recovery circuits convert the data for transfer to an external device. The transmit process operates in a similar fashion in reverse order.

The transmitted signal is GFSK (Gaussian Frequency Shift Keying) modulated data that is amplified on the chip to yield a radiated output of 0dBm. A power control signal for an external amplifier is provided.

The audio baseband processor (C1BB00001102) is a digital audio processor IC encompassing apt-XTM audio compress/decompress algorithm for wireless transmission of crystal-clear CD quality audio data.

For digital transmission the analog audio signals are sampled at 48kHz and converted to 1.536Mbps digital data through an external 16-bit stereo audio codec. The digitized data are apt-XTM 4:1 compressed to 384Kbps stream data for efficient transmission. Redundancy bits for forward error correction (FEC), synchronization flags, and control signals for time-division duplexing (TDD) are appen ded to form data frames for error-free transmission.

In the receiver(Slave), synchronization flags and control data are first detected from the input stream. FEC decoder corrects any errors that may have been introduced during the transmission and produces error-free compressed audio data. The compressed audio is decompressed into 16-bit stereo PCM audio data through digital signal processing blocks. External audio codec converts the PCM data to 2-channel (left and right) analog audio signals.

The Tx/Rx controller is in charge of several functions such as radio channel setup, frequency hopping for interference reduction and generation of control signal for TDD and external RF chip.

In audio mode, the transmitter(Master) can send additional 16Kbps digital data simultaneously with stereo audio data.

How much time delay to transmit audio in wireless?

Audio compression and decompression requires about 3ms. Total time delay can be calculated as follows: Total delay time = audio compression time + transmitter operating time + receiver operating time + audio decompression time. Total delay time is approximately 12.2ms.

What is the power consumption?

The 2.4GHz RF module consumes about 45mA (max 65mA) for the transmitter and 55mA (max 71mA) for the receiver. The EEPROM consumes about 1mA while the baseband IC consumes about 20mA. The total power consumption is 66mA (max 86mA) for the transmitter and 76mA (max 92mA) for the receiver.

SA-HT640WP / SA-HT640 WPC

Does the system support any mode to save power consumption?

Yes, it has POWER SAVING SCAN mode. When the communication link is lost, the slave starts scanning procedure to re-establish the link. If the slave cannot find the master within a certain amount of time (info stored in EEPROM), the slave automatically goes into power saving scan mode.

How does the system handle interference from other 2.4GHz RF devices?

It adopts Adaptive Frequency Hoppin g Spread Spectrum (AHSS) technology to avoid interference.

How does the system handle interference from other 2.4GHz RF devices?

The system supports 3 types of Spread Spectrum. These are

1. FHSS - Frequency Hopping Spread Spectrum

2. AHSS - Adaptive Frequency Hopping Spread Spectrum

3. Fixed Channel Mode

FHSS refers to the conventional 79 channels (or 23 dependent on the country) hopping of Bluetooth. Devices using such hopping method receives a lot of interference from other devices that use 2.4GHz range frequency such as WLAN and other Bluetooth devices. FHSS, being built to avoid interfering with other devices, rather interferes a lot with devices that has high output power using 2.4GHz frequency range and with other FHSS devices. During initialization, system scans 79 channels (or 23) and selects the clear, non-interfered and reliable channel and starts the communication between master and slave. During the channel link, the channel becomes unreliable and the error detection from FEC block exceed s the preset error threshold value, the system executes scanning, as in initialization, and reselects new clear and reliable channel.

FHSS and AHSS can be selected by setting appropriate parameters on the EEPROM.

In Fixed Channel mode, 4 frequency levels can be selected (2.410GHz, 2.430GHz, 2.450GHz and 2.470GHz)

Spectrum distribution characteristic of 2.4GHz RF signal

SA-HT640WP / SA-HT640 WPC

How can Master or Slave setting be selected? By software or hardware?

It can be selected by external control pin.

How long does it take to transmit single packet?

To establish communication channel properly, hopping frequency and Syncword of each packet should be determined by Device ID(Identification). Device ID is unique value of each device, master and slaves. Only master and slaves with same Device ID can communicate each other. Device ID can be set manua lly in case selected master and slaves do not communicate together. This procedure is *Device ID set*. Device ID set procedure occurs when master and slave devices boot simultaneously with ID_SET=1. In this procedure, the slave can figure out the Device ID of the master and store it in external EEPROM. When ID_SET is established, S5G3000 performs ID send/scan to send Device ID of master to slave before general page operation. In normal mode, communication is accomplished by going into page state directly without ID send/scan.

How can the Master and Slave units be paired to prevent mix-up?

It takes 2.5ms.

SA-HT640WP / SA-HT640 WPC

8.3. Class-D Amplifier

8.3.1. How are digital amplifiers different?

A digital amplifier incorporates a switching output stage that operates according to a principle known as pulse width modulation (PWM). In contrast to the low-frequency control signal used in a conventional analog amplifier output stage, the switching output stage of a digital amplifier is controlled by a high-frequency digital signal. The high-frequency digital signal is a PWM signal, in which the music is modulated into a fixed-frequency carrier signal. In a digital amplifier, the modulation process is based on a digital pulse code modula ted (PCM) representation of the music signal (or other signal that needs amplification) from a CD player, a DVD player, or some other device.

8.3.2. What are the advantages of digital amplification technology?

· High power efficiency, i.e., smaller heat sinks and/or no fan required

· Compact (reduced PCB area)

· Low weight (reduced transformer size)

· Good sound quality (low signal distortion/THD)

8.3.3. Why is the digital amplifier so efficient?

A class-D amplifier is one in which the output transistors are operated as switches. When a transistor is off, the current through it is zero. When it is on, the voltage across it is small, ideally zero. In each case, the power dissipa tion is very low.

8.3.4. Does the “D” in class-D mean DIGITAL?

No. This is not correct because the operation of the class-D amplifier is based on analog principles. There is no digital coding of the signal. Before the advent of the class-D amplifier, the standard classes were class-A, class-AB, class-B, and class-C. The “D” is simply the next letter in the alphabet after “C.” Indeed, the earliest work on class-D amplifiers involved vacuum tubes and can be traced to the early 1950s.

SA-HT640WP / SA-HT640 WPC

8.3.5. What are the potential problems of a Class-D amplifier based system?

The two most common issues of class-D amp system are AM interference and EMI. The switching frequency of class-D ranges from 300kHz to 450kHz typically 315kHz. The harmonics of such switching frequency will fall into the AM band of 600kHz to 1710kHz. To avoid interfe rence, it is recommende d to have a variable switching frequency adjustment circuit [usually known as beatproofing in PSG). Systems without AM tuner are not required to have such circuitry.

SA-HT640WP / SA-HT640 WPC

Class-D amp systems are basically switching systems. As such, it is prone to EMI. EMI issues can be rectified through proper grounding techniques and proper components layout. It is quite common to see ferrite beads, capacitors and inductors on these systems.

Another issue would be interchannel modulation. This problem would only arise if each channel is using different switching frequency. It would create an amplified “beat” that can be heard from speakers.

8.3.6. Other issues should we be aware of ?

The class-D amplifier IC is limited to only +/- 30volts power supply. This system uses a linear power source to supply power to the module. These linear power supplies are unregulated (i.e. voltage is not fixed). Therefore we have to implement a voltage limiter circuit that would limit the maximum voltage of +/-27volts. It is also imperative that the power supply voltages are almost balanced.

Also, the class-D amplifier IC is configured as single-ended connection. It means one of the outputs is a signal while the other is connected to ground. With this configuration, this Class D amplifiers will deliver energy back to the power supply . We refer to this phenomenon as “Supply pumping effect”. Supply pumping effect is more evident on very low frequencies. It is recommended to have enough buffer on the supply rails to limit the supply pumping effect. It is also advised not to use any type of speakers for testing. There is an output filter that needs to be matched with the intended speaker. A normal resistive load may be used.

8.3.7. Actual Class-D amplifier IC information

Part number: C1BA00000407 (TDA8920BJ)

SA-HT640WP / SA-HT640 WPC

Block diagram:

IC Package Information

Soldering Information

Wave Soldering/Dipping: The maximum permissible temperature of the solder is 260 ｰC; solder at this temperature must not be in contact with the joints for more than 5 seconds. The total contact time of successive solder waves must not exceed 5 seconds. Manual Soldering: If the temperature of the soldering iron bit is less than 300 ｰC it may remain in contact for up to 10 seconds. If the bit temperature is between 300 and 400 ｰC, contact may be up to 5 seconds.

9 Self-Diagnosis and special mode setting

9.1. Service Mode Summary Table

The service modes can be activated by pressing various button combination on the player and remote control unit.

Below is the summary of major checking:

Player buttons Remote control unit buttons Application Note

STOP 0 Error code display (Refer to the section,

5 Jitter checking Refer to the section “9.2

6 Region display and mode (Refer to the section “9.2 7 Micro-processor firmware version check

FUNCTIONS DVD laser drive current check Refer to the section

3 CD laser drive current check

PAUSE Writing of laser drive current value after replacement of optical

pickup (Do use this function only when optical pickup is replaced.)

Initialization of the player (factory setting is restored.) Used after replacement of micro-computer, FLASH ROM IC, EEPROM.

8 DVD HDMI Module firmware version check

ENTER DVD Module Reset.

“9.3 DVD Self Diagnostic Function-Error Code”).

Service Mode Table 1” for more information).

Service Mode Table 1 for more information”).

“9.2.1. Optical Pick-up Self-Diagnosis”.

Refer to the section “9.2 Service Mode Table 1” for more information).

SA-HT640WP / SA-HT640 WPC

9.2. Service Mode Table 1

By pressing various button combin ations on the player and remote control unit can activate the various service modes for checking.

Special Note:

Due to the limitations of the no. characters that can be shown on FL Display, the “FL Display” button on the remote control unit is used to show the following page. (Display 1/Display 2).

SA-HT640WP / SA-HT640 WPC

Mode Name

Jitter check

Error code

check

Initial setting of laser drive

current

DVD laser drive current measurement

ADSC internal

RAM data

check

CD laser drive

current

measurement

Item

Description

Jitter check Jitter rate is measured and displayed. Measurement is repeatedly done in the cycle of one second. Read error counter starts from zero upon mode setting. When target block data failed to be read out, the counter advances by one increment. When the failure is caused by minor error, it may be corrected when retried to enable successful reading. In this case, the counter advances by one. When the error persists even after retry, the counter may jump by two or more.

Error code check The latest error code stored in the EEPROM IC is displayed.

Initial setting of laser drive current. Initial current value for each of DVD laser and CD laser is separately saved in the EEPROM IC.

DVD laser drive current measurement

·DVD laser drive current is measured and the result is displayed together with the initial value stored in the EEPROM IC. After the measurement, DVD laser emission is kept on. It is turned off when POWER key is switched off. (It is also turned off when POWER button on the player is switched off.)

ADSC internal RAM data check

·ADSC internal RAM data is read out and displayed.

CD laser drive current measurement CD laser drive current is measured and the result is displayed together with the initial value stored in the EEPROM IC. After the measurement, CD laser emission is kept on. It is turned off when POWER key is switched off. (It is also turned off when POWER button on the player is switched off.)

FL Display

Jitter rate

Jitter check mode

Jitter rate is shown in decimal notation to one place of decimal. Focus drive value is shown in hexadecimal notation.

Error code (play_err) is expressed in the following convention. Error code = 0 x DAXX is expressed: DVDnn UXX Error code = 0 x DBXX is expressed: DVDnn HXX Error code = 0 x DXXX is expressed: DVDnn FXXX Error code = 0 x 0000 is expressed: DVDnn F--* "xx" denotes the error code

Laser current measurement mode

The value denotes the current in decimal notation. The above example shows the initial current is 34mA and 28mA for DVD laser and CD laser respectively when the laser is switched on.

DVD laser current measurement mode

The value denotes the current in decimal notation. The above example shows the initial current is 34mA and the measured value is 32mA.

Address

RAM data for specified address

The value is shown in hexadecimal notation. The above example shows the data in ADSC address OFAh is 6901h.

CD laser current measurement mode

The value denotes the current in decimal notation. The above example shows the initial current is 28mA and the measured value is 26mA.

Key Operation

Front Key

In STOP (no disc) mode, press STOP button on the player, and "5" button on

the remote control unit. Press STOP or OPEN button to exit. Press "FL Display" button on remote control unit for next page (FL Display).

In STOP (no disc) mode, press STOP button on the player, and "0" button on the remote control unit. * With pointing of cursor up and down on display. Cancelled automatically 5 seconds later. To exit, press [POWER] button on main unit or remote control.

In STOP (no disc) mode,

press STOP button on the

player, and PAUSE button

on the remote control unit.

Cancelled automatically 5 seconds later. Press "FL Display" button on remote control unit for next page (FL Display) on values of laser drive current.

In STOP (no disc) mode, press STOP button on the player, and FUNCTIONS button on the remote control unit. Cancelled automatically 5 seconds later. Press "FL Display" button on remote control unit for next page (FL Display) on values of dvd drive current.

In STOP (no disc) mode, press STOP button on the player, and "1" button on the remote control unit.

Press STOP or PLAY button.

In STOP (no disc) mode, press STOP button on the player, and "3" button on the remote control unit. Cancelled automatically 5 seconds later. Press "FL Display" button on remote control unit for next page. (FL Display)

SA-HT640WP / SA-HT640 WPC

Micro-processor firmware version display & EEPROM checksum display.

Initialization

Region display

DVD (HDMI) module firmware version display

Communication

error display

DVD Module

Reset

Item

DescriptionMode Name

Micro-processor firmware version display & EEPROM checksum display.

Initialization User settings are cancelled and player is initialized to factory setting.

Region display & mode

DVD (HDMI) module firmware version is displayed on the FL Display.

Displays frequency of communication errors between system control IC and mechanism control IC during DVD module.

To reset DVD Module. (After initialisation) Refer to Section 9.5.3 for more information.

N: noPAL / P: PAL

Region No.

Region

FL Display

N: NTSC / 6: PAL60

Destination System controller generation

Panel controller jumper information

System controller version

Key Operation

Front Key

In STOP (no disc) mode, press STOP button on the player, and "7" button on the remote control unit. Cancelled automatically

5 seconds later. Press "FL Display" button on remote control unit for next page. (FL Display)

In STOP (no disc)

mode, press STOP button

on the player , and

10 button on the remote control unit.

In STOP (no disc) mode, press STOP button on the player, and "6" button on the remote control unit. Cancelled automatically 5 seconds later.

In STOP (no disc) mode, press STOP button on the player, and "8" button on the remote control unit. Cancelled automatically 5 seconds later.

In STOP (no disc) mode, press STOP button on the player, and "MENU" button on the remote control unit. Cancelled automatically 5 seconds later.

While in initialization mode, press & hold STOP button on player follow by "ENTER" button on remote control unit.

Cancelled automatically 5 seconds later.

SA-HT640WP / SA-HT640 WPC

Mode Name

Timer 1 check

Timer 1 reset

Timer 2 check

Timer 2 reset

Item

Description

Timer 1 check Laser operation timer Operation time is measured separately for DVD laser and CD laser. Press "FL Display" button for next page of FL Display

Timer 1 reset Laser operation timer Operation time of both DVD laser and CD laser is reset all at once.

Timer 2 check Spindle motor operation timer

Press "FL Display" button for next page of FL Display

Timer 2 reset Spindle motor operation timer Press "FL Display" button for next page of FL Display

FL Display

Shown to the left is DVD laser time, and to the right CD laser time. Time is shown in 4 digits of decimal notation in a unit of 10 hours. "0000" will follow "9999".

T1–0000/0000 (display1/display2)

Time is shown in 5 digits of decimal notation in a unit of 10 hours. "00000" will follow "99999".

T2–00000

Key Operation

Front Key

In STOP (no disc) mode, press STOP button on the player, and " " button on the remote control unit. Cancelled automatically 5 seconds later.

While displaying Timer 1 data, press STOP button on the player, and " " button on the remote control unit. Cancelled automatically 5 seconds later.

In STOP (no disc) mode, press STOP button on the player, and " " button on the remote control unit. Cancelled automatically 5 seconds later.

While displaying Timer 2 data, press STOP button on the player, and " " button on the remote control unit. Cancelled automatically 5 seconds later.

9.2.1. Optical Pick-up Self-Diagnosis

The optical pickup self-diagnosis function and tilt adjustment check function have been included in this unit. When repairing, use the following procedure for effective self-diagnosis and tilt adjustment. Be sure to use the self-diagnosis function before replacing the optical pickup when "NO DISC" is displayed. As a guideline, you should replace the optical pickup when the value of the laser drive current is more than 10 (Difference between actual and preset value).

Note:

Press the power button to turn on the power, and check the value within three minutes before the unit warms up. (Otherwise, the result will be incorrect.)

+ 90 hidden pages

Panasonic SA-HT640WP, SA-HT640WPC, SB-W640, SB-SA640, SB-PC640 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual