Panasonic SA-AK640E Manuel utilisateur

ORDER NO. MD0601012C2

CD Stereo System

SA-AK640E / SA-AK640EB / SA-AK640EG

Colour

(S)... Silver Type

Notes: This model’s CD mechanism changer unit is CRS1. Please refer to

the original Service Manual (Order No. MD0509368C0) for this mechanism.

SPECIFICATIONS

Specifications

AMPLIFIER SECTION

RMS output power

THD 10%,

1 kHz

(Low channel-both channels driven)

90 W per channel (3 )

10 kHz

(High channel-both channels driven)

90 W per channel (3 )

60 Hz

(Subwoofer channel) 180 W (8 )

Total output power 540 W

FM/AM TUNER, TERMINALS SECTION

Preset station FM 15 stations

AM 15 stations

Frequency Modulation (FM)

Frequency range

87.50 to 108.00 MHz (50 kHz steps)

Sensitivity 4.0 V (IHF)

S/N 26dB 2.2 V

Antenna terminal(s) 75 (unbalanced)

Amplitude Modulation (AM)

Frequency range 522 to 1629 kHz (9 kHz step)

Sensitivity

S/N 20dB (at 999 kHz) 560 V/m

Music Port input jack

Terminal Stereo, 3.5 mm jack

Sensitivity 100 mV, 4.7 k

Phone jack

Terminal Stereo, 3.5 mm jack

CASSETTE DECK SECTION

Track system 4 track, 2 channel

Heads

Record/playback Solid permalloy head

Erasure Double gap ferrite head

Motor DC servo motor

Recording system AC bias 100 kHz

Erasing system AC erase 100 kHz

Tape speed 4.8 cm/s

Overall frequency response (+3, -6 dB) at DECK OUT

NORMAL 35 Hz to 14 kHz

S/N ratio 50 dB (A weighted)

Wow and flutter 0.18 % (WRMS)

Fast forward and rewind time Approx. 120 seconds with

C-60 cassette tape

DISC SECTION

Disc played [8 cm or 12 cm]

(1) CD-Audio (CD-DA)

(2) CD-R/RW (CD-DA, MP3, WMA formatted disc)

(3) MP3/WMA

Bit rate

MP3, WMA 32 kbps to 320 kbps

Sampling frequency

MP3/WMA 32 kHz, 44.1 kHz, 48 kHz

CD-DA 44.1 kHz

Decoding 16 bit linear

Digital filter 8 fs

D/A converter MASH (1 bit DAC)

Pick up

Wavelength 780 nm

Beam Source Semiconductor laser

Audio output (Disc)

Number of channels 2 (Stereo) (FL,FR)

GENERAL

Power supply

For E/EG only AC 230 V, 50Hz

For EB only AC 230 to 240 V, 50Hz

Power consumption 128 W

Power consumption in standby

mode

0.5 W

Dimensions (W x H x D) 250 x 330 x 343 mm

Mass 7.1 kg

Operating temperature range +5 to +35°C

Operating humidity range 5 to 90% RH (no condensation)

SYSTEM

SC-AK640 (E) Music center: SA-AK640 (E)

Speaker: SB-AK640 (EG)

Subwoofer: SB-WAK640 (EG)

SC-AK640 (EB) Music center: SA-AK640 (EB)

Speaker: SB-AK640 (EG)

Subwoofer: SB-WAK640 (EG)

SC-AK640 (EG) Music center: SA-AK640 (EG)

Speaker: SB-AK640 (EG)

Subwoofer: SB-WAK640 (EG)

For information on speaker system, please refer to the original

Service Manual (Order No. MD0601006C2) for SB-AK640EG and

(Order No. MD0601007C2) for SB-WAK640EG.

Notes:

1. Specifications are subject to change without notice. Mass and

dimensions are approximate.

2. Total harmonic distortion is measured by the digital spectrum

analyzer.

Unauthorized copying and distribution is a violation of law.

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, ensure that all the protective devices such as

insulation barriers and insulation papers shields are properly installed.

3. After servicing, check for leakage current checks to prevent from being

exposed to shock hazards.

1.1.1. Leakage Current Cold Check

1. Unplug the AC cord and connect a jumper between the two prongs on

the plug.

2. Using an ohmmeter measure the resistance value, 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 1M and 5.2M . / When the exposed metal does

not have a return path to the chassis, the reading must be .

Fig. 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 1.5k , 10 watts resistor, in parallel with a 0.15 F

capacitor, 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 exposed 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. Should

the measurement is out 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. Caution for AC Mains Lead

1.3. Before repair and adjustment

Disconnect AC power, discharge Power Capacitors C5101, C5104, C5171, C5172, C5920, C5940 and

C5950 through a 10 , 5W 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 consumption at AC 240V, 50 Hz in NO SIGNAL mode (volume min at CD mode) should be ~

350mA.

1.4. 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 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-equiped assembly, drain off any ESD on your body by

touching 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 equiped with ES devices, place

the assembly on a conductive surface such as aluminium foil, to

prevent electrostatic charge build up 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 remover device. Some solder removal

devices not classified as “anti-static (ESD protected)” can generate

electrical charge 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, aluminium 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 body 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).

3. Handling Precautions For Traverse Deck

The laser diode in the traverse deck (optical pickup) may break down due to potential difference caused

by the static electricity of clothes or our human body.

So, be careful of electrostatic breakdown during repair of the traverse deck (optical pickup).

- Way of handling the traverse deck (optical pickup)

1. Do not subject the traverse deck (optical pickup) to static electricity as

it is extremely sensitive to electrical shock.

2. To prevent the breakdown of the laser diode, an antistatic shorting pin

is inserted into the flexible board (FFC board).

3. Do not to apply excessive stress to the flexible board (FFC board).

When removing or connecting the short pin, finish the job in as short

time as possible.

4. Do not turn the variable resistor for laser power adjustment. (It is pre-

adjusted during production time)

Grounding for electrostatic breakdown prevention

1. Human body grounding

Use the anti-static wrist strap to discharge the static electricity from

your body.

2. Work table grounding

Put a conductive material (sheet) or steel sheet on the area where the

traverse deck (optical pickup) is place, and ground the sheet.

Caution :

The static electricity of your clothes will not be grounded through the wrist strap. So, take care not to

let your clothes touch the traverse deck (optical pickup).

Caution when replacing the Traverse Deck

The traverse deck has a short point shorted with solder to protect the laser diode against electrostatics

breakdown. Be sure to remove the solder from the short point before making connections.

4. Precaution of Laser Diode

Caution :

This product utilizes a laser diode with the unit turned "ON", invisible

laser radiation is emitted from the pick up lens. / Wavelength : 780 nm /

Maximum output radiation power from pick up : 100 W/VDE / Laser

radiation from pick up unit is safety level, but be sure the followings:

1. Do not disassemble the optical pick up unit, since radiation from

exposed laser diode is dangerous.

2. Do not adjust the variable resistor on the pick up unit. It was already

adjusted.

3. Do not look at the focus lens using optical instruments.

4. Recommend not to look at pick up lens for a long time.

ACHTUNG :

Dieses Produkt enthält eine Laserdiode. Im eingeschalteten Zustand

wird unsichtbare Laserstrahlung von der Lasereinheit abgestrahlt. /

Wellenlänge : 780nm / Maximale Strahlungsleistung der Lasereinheit :

100 W/VDE / Die Strahlung an der Lasereinheit ist ungefährlich, wenn

folgende Punkte beachtet werden:

1. Die Lasereinheit nicht zerlegen, da die Strahlung an der freigelegten

Laserdiode gefährlich ist.

2. Den werkseitig justierten Einstellregler der Lasereinhit nicht verstellen.

3. Nicht mit optischen Instrumenten in die Fokussierlinse blicken.

4. Nicht über längere Zeit in die Fokussierlinse blicken.

ADVARSEL: I dette a apparat anvendes laser.

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