Technics SADA-10 Service manual

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Service Manual

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Order No. MD0006112C1

AV Control Stereo Receiver

SA-DA10

Color

(K) ... Black Type

(N) ... Gold Type

PP ... U.S.A. and Canada

FM Tuner Section

Frequency range 87.9-107.9 MHz Sensitivity 11.2 dBf (2•V, IHF’58) 50 dB quieting sensitivity MONO 18.3 dBf (4.5•V, IHF’58) STEREO 38.3 dBf (45•V, IHF’58) Total harmonic distortion MONO 0.2% STEREO 0.3% S/N

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MONO 73 dB STEREO 67 dB Frequency response 20 Hz-15 kHz,+1 dB, -2 dB Alternate channel selectivity 65 dB Capture ratio 1.5 dB Image rejection at 98 MHz 40 dB Spurious response rejection at 98 MHz 75 dB AM suppression 50 dB Stereo separation 1 kHz 40 dB 10 kHz 30 dB Antenna terminal

75Ω (unbalanced)

AM Tuner Section

Frequency range 530-1710 kHz Sensitivity 20•V, 330•V/m Selectivity 55 dB IF rejection (at 1000 kHz) 50 dB

Video Section

Output voltage at 1 V input (unbalanced) 1±0.1 Vp-p Maximum input voltage 1.5 Vp-p Input/output impedance

75Ω

Amplifier Section

Rated minimum sine wave RMS power output 20 Hz-20 kHz both channels driven

0.09% total harmonic distortion

100 W per channel (6Ω)

1 kHz continuous power output both channels driven

0.05% total harmonic distortion

105 W per channel (6Ω)

Total harmonic distortion rated power at 20 Hz-20 kHz

0.09% (6Ω)

half power at 1 kHz

0.03% (6Ω)

Power bandwidth both channels driven, -3 dB

10 Hz-70 kHz (6Ω, 0.9%)

Power output at the DVD 6CH operation 20 Hz-20 kHz (each channels driven)

0.09% total harmonic distortion Front

2 x 100 W (6Ω)

Center

100 W (6Ω)

Surround

2 x 100 W (6Ω)

Low frequency damping factor

30 (6Ω)

Load impedance Front A or B

4 - 8Ω

A and B

8Ω

BI-WIRE

6 - 8Ω

Center

6 - 8Ω

Surround

6 - 8Ω

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Frequency response PHONO RIAA standard curve±0.8 dB CD, DVD, TV, VCR1, VCR2, VCR3, TAPE 10 Hz-100 kHz,±3 dB Input sensitivity PHONO 0.4 mV (3 mV, IHF’66) CD, DVD, TV, VCR1, VCR2, VCR3, TAPE 27 mV (200 mV, IHF’66) S/N (IHF A) (VGCA ON) PHONO 80 dB (80 dB, IHF’66) CD, DVD, TV, VCR1, VCR2, VCR3, TAPE 113 dB (IHF A, Rated Power, S=2 V)

90 dB (100 dB, IHF’66) Input impedance PHONO

47 kΩ

CD, DVD, TV, VCR1, VCR2, VCR3,TAPE

22 kΩ

Tone controls BASS 50 Hz,+10 to -10 dB TREBLE 20 kHz,+10 to -10 dB Subwoofer frequency response (-6 dB) 7 - 200 Hz Digital input (OPTICAL) CD, DVD, TV

General

Power supply AC 120 V, 60 Hz Power consumption 310 W Dimensions (W x H x D) 430 x 180 x 370 mm

(16-15/16” x 7-3/32” x 14-9/16”) Mass 12.7 kg (28.0 lb.) Power consumption in standby mode: 1 W

DIN POWER (1 kHz T.H.D. 1%)

2 X 100W (6Ω)

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.

* Manufactured under license from Dolby Laboratories.“Dolby”,“Pro Logic” and the double-D simbol are trademarks of Dolby Laboratories. ** Manufactured under license from Digital Theater System.“DTS” and“DTS Digital Surround” are trademarks of Digital Theater Syatem.

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Table Of Contents

COVER

1 Safety Precaution

2 Before Repair and Adjustment

3 Protection Circuitry

4 Accessories

5 Front Panel Controls

5.1 Front Panel

5.2 Remote Control

6 Operation Checks and Main Component Replacement Procedures

6.1 Checking Procedure for each major P.C.B.

6.2 Main Component Replacement Procedures

6.2.1 Replacement of the Power IC and Regulator Transistor

6.2.2 Installation of the bottom cover after replacement

7 Type Illustrations of ICs, Transistors& Diodes

8 Terminal Functions of ICs

9 Block Diagram

10 Schematic Diagram

11 Printed Circuit Board

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12 Wiring Connection Diagram

13 Parts Location and Replacement Parts List

13.1 Cabinet

13.1.1 Cabinet Parts Location

13.1.2 Cabinet Parts List

13.2 Electrical Parts List

13.3 Packing Materials& Accessories Parts List

13.4 Packaging

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1 Safety Precaution

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(This“Safety Precaution” is applied only in U.S.A.)

1. Before servicing, unplug the power cord to prevent an electric shock.

2. When replacing parts, use only manufacturer’s recommended components for safety.

3. Check the condition of the power cord. Replace if wear or damage is evident.

4. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.

5. Before returning the serviced equipment to the customer, be sure to make the following insulation resistance test to prevent the customer from being exposed to a shock hazard.

Insulation Resistance Test

1. Unplug the power cord and short the two prongs of the plug with a jumper wire.

2. Turn on the power switch.

3. Measure the resistance value with ohmmeter between the jumper AC plug and each exposed metal cabinet part, such as screw heads, antenna, control shafts, handle brackets, etc. Equipment

with antenna terminals should read between 3MΩ and 5.2MΩ toall exposed parts*. (Fig 1) Equipment without antenna terminals should read approximately infinity to all exposed parts. (Fig

*Note: Some exposed parts may be isolated from the chassis by design. These will read infinity.

4. If the measurement is outside the specified limits, there is a possibility of a shock hazard. The equipment should be repaired and rechecked before it is returned to the customer.

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2 Before Repair and Adjustment

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Disconnect AC power, discharge Power Supply Capacitors C1702 through a 10Ω, 5 W resistor to ground. DO NOT SHORT-CIRCUIT DIRECTLY (with a screw driver blade, for instance), as this may destroy solid state devices.

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

Current consumption at AC 120 V, 60 Hz in NO SIGNAL mode should be 750~1050 mA.

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3 Protection Circuitry

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

No sound is heard when the power is turned on.

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 ofthe 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.

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4 Accessories

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AC power supply cord... 1 pc.

AM Loop Antenna Set/... 1 set.

FM Indoor Antenna... 1 pc.

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Remote Control/Transmitter... 1 pc.

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5 Front Panel Controls

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5.1 Front Panel

5.2 Remote Control

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5.1 Front Panel

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5.2 Remote Control

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6 Operation Checks and Main Component Replacement Procedures

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“ATTENTION SERVICER”

Some chassis components maybe have sharp edges. Be careful when diassembling and servicing.

1. This section describes procedures for checking the operation of the major printed circuit boards and replacing the main components.

2. For reassembly after operation checks or replacement, reverse the respective procedures./Special reassembly procedures are described only when required.

3. Select items from the following index when checks or replacement are required.

Content

Checking Procedure for each major P.C.B.

................................................................................................................. P.g. 8~12

Main Component Replacement Procedures

1. Replacement of the Power IC and Regulator

Transistor........................................................................................ P.g. 13~14

2. Installation of the bottom cover after

replacement....................................................................................................... P.g. 15

6.1 Checking Procedure for each major P.C.B.

6.2 Main Component Replacement Procedures

6.2.1 Replacement of the Power IC and Regulator Transistor

6.2.2 Installation of the bottom cover after replacement

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