Panasonic SC-TM760 User manual

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(El peso y las dimensiones son de un solo bafle)

Stereo System SC-TM760 Colour (S)... Silver Type

MODEL UNIT

SC-TM760 SA-TM760 Stereo

SB-TM760 Front Speaker

SB-TM760 SB-TM760

SA-TM760

Specifications

POTENCIA DE SALIDA (AMPLIFICADOR)

SC-TM760 Frontal (Alto) 110 W RCM por canal (3Ω) 1kHz, 10% DAT

(Bajo) 110 W RCM por canal (3Ω) 100Hz, 10% DAT

UNIDAD PRINCIPAL

POTENCIA DE SALIDA: 5200 W (P.M.P.O.)

270 W

127 V ca ±10% 60 Hz

250 mV

520 - 1710 kHz (paso de 10 kHz)

87.9 - 107.9 MHz (paso de 0,2 MHz)

87.5 - 108.0 MHz (paso de 0,1 MHz)

CONSUMO DE POTENCIA:

ALIMENTACION:

SENSIBILIDAD AUX:

100 mV

SENSIBILIDAD MUSIC PORT:

RANGO DE SINTONIA AM:

RANGO DE SINTONIA FM:

DIMENSIONES (b x h x l)

PESO:

SA-TM760

ESPECIFICACIONES POR CADA BAFLE

FRONTAL

Bocina Super Woofer

Bocina Woofer

Bocina Tweeter

Super Tweeter

Alto 3 Ω, Bajo 3 Ω

SB-TM760

20 cm

12 cm

6 cm

IMPEDANCIA DE ENTRADA

Dimensiones (b x h x l) 250 mm x 429 mm x 318.5 mm

6.2 kg aprox.

5.4 kg aprox.

250 mm x 330 mm x 348 mm

Peso

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, make 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 connect 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 1MΩand 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 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. In case a 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.

SA-VK950GC / SA-VK950GS / SA-VK950GCS / SA-VK950GC

service manual SC-TM760

1.2. Safety Precaution for AC Power Supply Cord (For GS only)

1.3. Before Use (For GS/GCS/GCT only)

Be sure to disconnect the mains cord before adjusting the voltage selector.

Use a minus(-) screwdriver to set the voltage selector (on the rear panel) to the voltage setting for the area in which the unit will

be used. (If the power supply in your area is 117V or 127V, set to the “127V” position.)

Note that this unit will be seriously damaged if this setting is not made correctly. (There is no voltage selector for some countries,

the correct voltage is already set.)

1.4. Before Repair and Adjustment

Disconnect AC power, discharge Power Supply Capacitors C2254, C2256, C2288, C2289, C2632, C2721, C2725, C2811, C2815,

C2817, C5512, C5513, C5514, C5712, C5713, C5715, C5718, C5790, C5805, C5806, C5807, C5914, C5916, C5917, C5929,

C5930, C5971 and C5977 through a 10Ω, 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 110 ~ 127V, 50 / 60 Hz & AC 220 ~ 240V, 50 / 60 Hz in NO SIGNAL (vol. min, at CD mode) should

be ~500mA. [For GCS/GS/GCT only]

Current consumption at AC 220 ~ 240V, 50 / 60 Hz in NO SIGNAL (vol. min, at CD mode) should be ~500mA . [For GC only]

1.5. 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.

A-VK950GC / SA-VK950GS / SA-VK950GCS / SA-VK950GCT

service manual SC-TM760

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.

SA-VK950GC / SA-VK950GS / SA-VK950GCS / SA-VK950GC

service manual SC-TM760

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-equipped 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 equipped 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).

A-VK950GC / SA-VK950GS / SA-VK950GCS / SA-VK950GCT

service manual SC-TM760

3 Handling Precautions for Traverse Unit

The laser diode used inside optical pickup could be destroyed due to static electricity as a potential difference is caused by

electrostatic load discharged from clothes or human body. Handling the parts carefully to avoid electrostatic destruction during

repair.

3.1. Handling Optical Pickup

1.Do not impact on optical pickup as the unit structurally uses an extremely precise technology.

2.Short-circuit the flexible cable of optical pickup remove from the circuit board using a short-circuit pin or clip in order to prevent

laser diode from electrostatic destruction (Refer to Fig. 3.1 and Fig. 3.2)

3.Do not handle flexible cables forcibly as this may cause snapping. Handle the parts carefully (Refer to Fig. 3.1)

4.A new optical pickup is equipped with an anti-static flexible cable. After replacing and connecting to the flexible board, cut the

anti-static flexible cable. (Refer to Fig. 3.1)

Fig 3.1

3.2. Replacing Precautions for Optical Pickup Unit

CD/DVD Optical Pickup

The optical pickup by which part supply was carried out attaches the short clip to the flexible board for laser diode electrostatic

discharge damage prevention. Please remove the short clip and be sure to check that the short land is open, before connecting.

(Please remove solder, when the short land short-circuits.)

3.3. Grounding for Preventing Electrostatic Destruction

1.Human body grounding

Use the anti-static wrist strap to discharge the static electricity accumulated in your body. (Refer to Fig. 3.2)

2.Work place grounding

Place a conductive material (conductive sheet) or ironboard where optical pickup is placed. (Refer to Fig. 3.2)

Note :

Keep your clothes away from optical pickup as wrist strap does not release the static electricity charged in clothes.

Fig. 3.2

SA-VK950GC / SA-VK950GS / SA-VK950GCS / SA-VK950GC

service manual SC-TM760

5 Warning

5.1. Service caution based on legal restrictions

5.1.1. General description about Lead Free Solder (PbF)

The lead free solder has been used in the mounting process of all electrical components on the printed circuit boards used for this

equipment in considering the globally environmental conservation.

The normal solder is the alloy of tin (Sn) and lead (Pb). On the other hand, the lead free solder is the alloy mainly consists of tin

(Sn), silver (Ag) and Copper (Cu), and the melting point of the lead free solder is higher approx.30 degrees C (86°F) more than that

of the normal solder.

Definition of PCB Lead Free Solder being used

The letter of “PbF” is printed either foil side or components side on the PCB using the lead free solder.

(See right figure)

Service caution for repair work using Lead Free Solder (PbF)

• The lead free solder has to be used when repairing the equipment for which the lead free solder is used.

(Definition: The letter of “PbF” is printed on the PCB using the lead free solder.)

• To put lead free solder, it should be well molten and mixed with the original lead free solder.

• Remove the remaining lead free solder on the PCB cleanly for soldering of the new IC.

• Since the melting point of the lead free solder is higher than that of the normal lead solder, it takes the longer time to melt

the lead free solder.

• Use the soldering iron (more than 70W) equipped with the temperature control after setting the temperature at 350±30

degrees C (662±86°F).

Recommended Lead Free Solder (Service Parts Route.)

• The following 3 types of lead free solder are available through the service parts route.

RFKZ03D01K-----------(0.3mm 100g Reel)

RFKZ06D01K-----------(0.6mm 100g Reel)

RFKZ10D01K-----------(1.0mm 100g Reel)

Note

* Ingredient: Tin (Sn), 96.5%, Silver (Ag) 3.0%, Copper (Cu) 0.5%, Cobalt (Co) / Germanium (Ge) 0.1 to 0.3%

service manual SC-TM760

6 Accessories

Cable de alimentación de CA .......................... SJA168-1A

Antena interior

de FM .......................... RSA0007-L

Antena de cuadro

de AM .......................... ND1AAAA00002

Pilas para el mando a

distancia ...................... UM-3PA/T

Mando a distancia ........ N2QAHB000058

KM19201-01

Plug para RCA/ Jack 3.5 ........

service manual SC-TM760

8 New Features

8.1. CRS1D Mechanism Overview

A-VK950GC / SA-VK950GS / SA-VK950GCS / SA-VK950GCT

service manual SC-TM760

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