TECHNICS SADX940 Service Manual

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Service Manual for TECHNICS SADX940, downloadable as a PDF file.

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ORDER No.MD0006099C3
AV Control Stereo Receiver
SA-DX940
Colours
(K) ................. Black Type
(S) ................. Silver Type
Areas
(GCS) ............. Asia, Latin America, Middle East and Africa
(GK) ............... China
(GN) ............... Oceania
SPECIFICATIONS
Specification
1
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ORDER No.MD0006099C3
AV Control Stereo Receiver
SA-DX940
Colours
(K) ................. Black Type
(S) ................. Silver Type
Areas
(GCS) ............. Asia, Latin America, Middle East and Africa
(GK) ............... China
(GN) ............... Oceania
SPECIFICATIONS
Specification
1
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AMPLIFIER SECTION
Power output (at 240V)
DIN 1kHz (T.H.D. 1%)
2 x 100W (6
)
20Hz - 20kHz continuous power output
both channels driven
2 x 80W (6
)
Total harmonic distortion
rated power at 20Hz - 20kHz
0.05% (6
)
half power at 1kHz
0.03% (6
)
Power output at 1kHz each channel driven
DIN 1kHz (T.H.D. 1%)
Front
2 x 85W (6
)
Center
85W (6
)
Suuround
2 x 85W (6
)
Power bandwidth
both channels driven, -3dB
10Hz - 40kHz (6
)
Damping factor
30 (6
)
Load impedance
Front
A or B
4 - 16
A and B
8 - 16
Center
6 - 16
Surround
6 - 16
Frequency response
PHONO
RIAA standard curve /
(30Hz - 15kHz) ±0.8dB
CD, TAPE/MD, DVD, TV, VCR
10Hz - 40kHz, ±3dB
Input sensitivity and impedance
PHONO
3mV/47k
CD, TAPE/MD, DVD, TV, VCR
200mV/22k
S/N at rated power (6
)
PHONO
70dB (IHF, A: 80dB)
CD, TAPE/MD, DVD, TV, VCR
75dB (IHF, A: 85dB)
Tone controls
BASS
50Hz, +10 to -10dB
TREBLE
20kHz, -10 to -10dB
Output voltage
TAPE REC (OUT), VCR OUT
200mV
Channel balance (250Hz - 6.3kHz)
±1dB
Channel separation
55dB
Headphones output level and /
impedance
430mV/330
Subwoofer frequency response / (-
6dB)
7 - 200Hz
Digital input
Optical
CD, DVD, TV
FM TUNER SECTION
Frequency range
87.50 - 18.00MHz
Sensitivity
S/N 30dB
1.5
V/75
2
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S/N 26dB
1.3
V/75
S/N 20dB
1.2
V/75
IHF usable sensitivity (IHF '58)
1.5
V/75
IHF 46dB stereo quieting sensitivity
22
V/75
Total harmonic distortion
MONO
0.2%
STEREO
0.3%
S/N
MONO
60dB (73dB, IHF)
STEREO
58db (67dB, IHF)
Frequency response
20Hz - 15kHz
-1dB, -2dB
Alternate channel selectivity
±400kHz
65dB
Capture ratio
1.5dB
Image rejection at 98MHz
40dB
IF rejection at 98MHz
70dB
Spurious response rejection / at
98MHz
70dB
AM suppression
50dB
Stereo separation
1kHz
40dB
Carrier leak
19kHz
-30dB (-35dB, IHF)
38kHz
-50db (-55dB, IHF)
Channel balance (250Hz - 6.3kHz)
±1.5dB
Limiting point
1.2
V
Bandwidth
IF amplifier
180kHz
FM demodulator
1000kHz
Antenna terminal
75
(unbalanced)
AM TUNER SECTION
Frequency range
522 - 1611kHz (9kHz steps)
/ 530 - 1620kHz (10kHz
steps)
Sensitivity
20
V, 330
V/m
Selectivity (at 999kHz)
55dB
IF rejection (at 999kHz)
50dB
VIDEO SECTION
Output voltage at 1V input /
(unbalanced)
1±0.1Vp-p
Maximum input voltage
1.5Vp-p
Input/output impedance
75
(unbalanced)
GENERAL
Power supply
AC220-240V, 50/60Hz
3
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Power consumption
240W / (in standby
condition: 2W)
Dimension (W x H x D)
430 x 158 x 324.5mm
Mass
9.7kg
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.
*
1
Manufactured under license from Dolby Laboratories
Licensing / Corporation. "Dolby", the double-D symbol and
"PRO LOGIC" / are trade marks of Dolby
LaboratoriesLicensing Corporation.
*
2
This product is manufactured under license from DTS, / Inc.
of America.
1. Accessories
2. Before Repair
1. Turn off the power supply. Using a 10
, 10W resistor, connect
both ends of power supply capacitors (C703, C704, C705 and
C706) in order to discharge the voltage.
4
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2. Before turning the power supply on, after completion of repair,
slowly apply the primary voltage by using a power supply voltage
controller to make sure that the consumed current at 50Hz in NO
SIGNAL mode should be shown below with respect tosupply
voltage 230/230-240V.
Power supply
voltage
AC230V, 50Hz
AC240V, 50Hz
Consumed
current
Less than
500mA
Less than
500mA
3. 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 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.
4. Location of Controls
4.1. Main unit
5

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