Technics SA-DA15 Service Manual

Service Manual

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Order No. MD0105119C1

A2

AV Control Stereo Receiver

SA-DA15

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Color

(K) ... Black Type

(N) ... Gold Type

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

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FM Tuner Section

Frequency range 87.9-107.9 MHz

Sensitivity 11.2 dBf (2μV, IHF’58)

50 dB quieting sensitivity

MONO 18.3 dBf (4.5μV, IHF’58)

STEREO 38.3 dBf (45μV, IHF’58)

Total harmonic distortion

MONO 0.2%

STEREO 0.3%

S/N

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 3 0 dB

Antenna terminal 75Ω (unbalanced)

AM Tuner Section

Frequency range 530-1710 kHz

Sensitivity 20μV, 330μV/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

0.05% 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 0.05% (6Ω)

half power at 1 kHz 0.03% (6Ω)

Power bandwidth

both channels driven, -3 dB 10 Hz-100 kHz (6Ω, 0.9%)

Power output at the DVD 6CH operation

20 Hz-20 kHz (each channels driven)

0.05% 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

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Front

A or B 4 - 8Ω

A and B 8Ω

BI-WIRE 6 - 8Ω

Center 6 - 8Ω

Surround 6 -8 Ω

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 (L/R/C/LS/RS), TV, VCR1, VCR2, VCR3, TAPE 113 dB (IHF A, Rated Power, S=2 V)

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

General

Power supply AC 120 V, 60 Hz

Power consumption 400 VA 310 W

Dimensions (W x H x D) 430 x 158 x 370 mm

Mass 11.7 kg (25.8 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.

90 dB (100 dB, IHF’66)

(16-15/16” x 6-7/32” x 14-9/16”)

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* 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 System.“DTS” and“DTS Digital Surround” are trademarks of Digital Theater System.

© 2001 Matsushita Electronics (S) Pte. Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.

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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.

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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 2)

*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, C703~C706, C742, C901, C904
through a 10 Ω, 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 450~1000 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:

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No sound is heard when the power is turned on.

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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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5.1 Front Panel

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5.2 Remote Control

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5 Front Panel Controls

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5.1 Front Panel

5.2 Remote Control

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

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Step 1 & Step 2 Unscrew and remove top cabinet as shown.

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Step 3 Remove all the screws.

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Step 4 Remove the screws.

Step 5 Remove the support bar (B).

Step 6 Release the connectors CP506 and CP451.

Step 7 Remove the screw.

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Step 8 Release the connector CP351 and CP353.

Step 9 Release the flat cable from CN901B.

Take note of CN504, CN505 and CN902.

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Step 10 Remove all the screws and support bar (A).

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Step 11 Unscrew the nut from AL Panel and remove the Volume Knob.

Step 12 Remove ll the screws and pull the Volume P.C.B. up as shown.

Take note of CP501 and CP502.

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Step 13 Lift up Panel P.C.B. and remove all connectors.

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Step 14 Remove Tone Knob, Selector Ring, Light Guide and unscrew the nut.

Step 15 Remove all the screws./Take note of CP503.

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Step 16 Remove all the screws.

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Step 17 Release the AC In/Out P.C.B. catch.

Step 18 Release the CP771 and pull out the rear panel in the direction shown.

Step 19 Remove the screw, CN1001B, CN1002B and Shield Plate.

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Step 20 Release the CN702 and pull out the Surround P.C.B. in the direction shown./Take note of CN1201 to CN1204.

Step 21 Release the CN354 and pull out the Input Selector P.C.B. in the direction shown./Take note of CN401 to CN403.

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Step 22 Remove all the screws.

Step 23 Release the CN102 and CN103 from the Phono P.C.B..

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Step 24 Remove all the screws.

Step 25 Release the CN751 and CN752 from the Power P.C.B.. Pull out in the direction shown.

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6.2.1 Replacement of the Power IC and
Regulator Transistor

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Step 1 Remove the top cabinet.

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Step 2 Cut the joints as shown below. (8 joints)

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Step 3 Fold the joints. (8 joints)

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Step 4 Desolder the terminals of Power IC and Regulator Transistor.

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Step 5 Remove all the screws and remove IC601.

• The PROTO Offset Screwdriver No.34-1/4 is recommended for use in the application above.

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Step 6 Remove all the screws at the rear panel and pull out Shield Plate, Surround P.C.B. and Input

Selector P.C.B. from Main P.C.B..

Step 7 Remove the two screws from IC602.

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6.2.2 Installation of the bottom cover after
replacement

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