Technics SADX 930 Service Manual

Page 1

ORDER NO. MD9905089C2

ervice Manual

AV Control Stereo Receiver Receiver
m- Pa-mv. PIE SA-DX930
' Colour

(K) Black Type

llllll\\\\ , Area

(E) Europe
(EB) Great Britain (K)
(EG) Germany & Italy

Manufactured under license from Dolby Laboratories Licensing Corporation. Dolby , the double-D symbol
and PRO LOGIC are trade marks of Dolby Laboratories Licensing Corporation.

This product ls manufactured under licence from DTS, Inc. of America.

I Specifications

I AMPLIFIER SECTION
Power output Frequency response
DIN 1 kHz ( T.H.D. 1%) 2 X 100 W (so) PHONO RIAA standard curve : 0.3 dB
20 Hz - 20 kHz contlnuous power output co, TAPE, DVD, VCR, TV 10 Hz - 70 kHz, a 3 dB
bothrchannete drIven 2 X 80 W (69) Input sensitivity and Impedance
Total harmonic distortion PHONO 3 mV / 47 kt:
Hated Power at 20 Hz - 20 kHz 0.05% (60) cc, TAPE, DVD, VCR, TV 200 mV / 22 kc
Half power an kHz 0.03% (69) SIN at rated power (on)
Power output at the Dolby Pro Logic operation pHONo 70 dB (IHF, A : 80 dB)
DIN 1 kHz ( T.H.D. 1%) CD, TAPE, DVD, VCR, TV 75 dB (IHF, A : 85 dB)
Front 2 X 100 W (69) Tone controls
center 100 W (69) BAss 50 Hz, +10 to -10 dB
Surround 2 X 100 W (60) TREBLE 20 kHz, +10 to -10 dB
Power bandwidth output voltage
both channel driven, -3 dB 10 Hz - 40 kHz (69) TAPE REC (OUT), vcn OUT 200 mV
Damping factor 30 (69) Channel balance (250 Hz - 6.3 kHz) 1 1 dB
Load Impedance Channel separation 55 dB
Front Headphones output level and Impedance 430 mV / 300 Q
A or B 4 - 16 fl Sub-Woofer frequency response 7 -100 HZ, :3 dB
A and a e - 16 a
Center J 6 - 16 9 Digital Input
Surround 6 - 16 9 Optical CD, DVD

A WARNING

This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does
not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products
powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair
the produbt or products dealt with in this service information by anyone else could result in serious injury or death.

© 1999 Matsushita Electronics (S) Pte. Ltd.

' - . ® All rights reserved. Unauthorized copying
ac nlcs and distribution is a violation of law.

Page 2

SA-DX930

I FM TUNER SECTION
Frequency range 8750 - 108.00 MHz
Sensitivity

SIN 30 dB 1.5 uV/759

SlN26dB 1.3pV/75Q

SMZOdB 1.2uV/759
IHF usable sensitivity (IHF58) 1.5 uV / 75 Q
IHF 46 dB stereo quietlng sensitivity 22 pV / 75 Q
Total harmonic distortion

MONO 0.2%

STEREO 0.3%
SIN

MONO 60 dB (73 dB, IHF)

STEREO 58 dB (67 dB, IHF)
Frequency response 20 Hz - 15 kHz +1 dB, -2dB
Alternate channel selectivity : 400 dB 65 dB
Capture ratio 1.5 dB
Image rejection at 98 MHz 40 dB
IF rejection at 98 MHz 70 dB
Spurious response rejection at 98 MHz 70 dB
AM suppression 50 dB
Stereo separation

1 kHz 40 dB
Carrier leak

19 kHz -30 dB (-35 dB. IHF)

38 kHz ~50 dB (-55 dB, IHF)
Channel balance (250 Hz - 6.3 kHz) 1 1.5 dB
Limiting point 1.2 uV
I Contents PAGE

0 Accessories ........................................................
- Before Repair & Adjustment / Protection Circuitry
- Caution for AC mains lead.
- Front Panel Controls ......
- Preparatory Steps
- Basic Operations.
- Digital Signal Processor .....................................
Making A Recording 8. Using the Remote Control
0 Operations Checks ........
- Terminal Functions of ICs.

I Accessories

Bandwidth
IF amplifier 180 kHz
FM demodulator 1000 kHz
Antenna terminal 75 o (unbalanced)

I AM TUNER SECTION
Frequency range 522 - 1611 kHz (9 kHz steps)

530 - 1620 kHz (10 kHz steps)

Sensltlvty 20 W, 330 uV/m
Selectlvlty (at 999 kHz) 55 dB
lF rejection (at 999 kHz) 50 dB
I VIDEO SECTION

Output voltage at 1 V input (unbalanced) 1:0.1 Vp-p
Maximum input voltage 1.5 Vp-p
Input/output impedance 75 9 (unbalanced)

I GENERAL

Power consumption
Power supply
Dimensions (W x H x D)
Weight

240 W (In standby condition : 2 W)
AC 230 - 240 V, 50 Hz

430 x 158 x 324.5 mm

9.6 kg

Notes :

1. Specifications are subject to change without notice.
Weight and dimensions are approximate.

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

- Type Illustration of ICs Transistors and Diodes
- Wiring Connection Diagram ............
- Block Diagram .......
- Schematic Diagram
- Printed Circuit Board
. Cabinet Parts Locations
- Repalcement Parts List.
- Resistors 8t Capacitors .
- Packing Materials & Acessorles.
- Packaging ...............................

Power Supply Cord lor
United Kingdom only

Power Supply Cord

for Others AM Loop antenna set

FM indoor antenna

Antenna plug adaptor
for United Kingdom

Batteries

Remote Control

I Before Repair and Adjustment

Disconnect AC power, discharge Power Supply Capacitors C703, C704, C705 and C706 through a 109 , 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 230-240 V, 50Hz in NO SIGNAL mode should be 300 ~ 400 mA.

I 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", orif 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.