Technics SAAX 710 Service Manual

Page 1

ORDER NO. MDQ70809002

Service Manual

AV Control Stereo Receiver

on-

PRO-LOGIC

Manufactured under license lrom Dolby Laboratories
Licensing Corporation.

DOLBY, lhe double-D symbol m and FRO LOGIC are
trademark oi Dolby Laboratories Licensing Corporation.

Specmcatlons
FM TUNER SECTION
Frequency range 8750 - 108.00 MHZ
Sensitivity
SIN 30 dB 1,5 LIV/75D.
SIN 26 dB 1.8 uV/75 fl
SIN 20 :13 1.2 ilV/75 Q
lHF usable sensitivity (lHF'SB) 1.5 pV/75 9
INF 46 dB stereo quieting sensitivity 22 pV/75 a
Total harmonic distortion
MONO 0.2 "/a
STEREO 0.3 "/0
SIM
MONO 60 dB (75 dB, lHF)
STEREO 58 dB (71 dB, lHF)

Frequency response 20 Hz - 15 kHz (+1 dB, -2 dB)
Alternate channel selectivity i 400 kHz 60 dB
Capture ratio 1 dB
Image rejection at 98 MHz 40 dB

IF reiection at 93 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, lHF)

38 kHz -50 dB (-55 dB. lHF)
Channel balance (250 Hz - 6.3 kHz) : 1.5 dB
Limiting point 1.2 pV
Bandwidth

IF ampllller 180 kHz

FM demodulator 1000 kHz

Receiver

SA-AX71 0

Colour
(K) ........ Black Type

Areas
(E) . .. Europe.
(EB) .. Great Britain.
(EG) ...... Germany and
Italy.
Total harmonic distortion
rated power at 20 Hz - 20 kHz 0.05 % (8 (2)
half power at 1 kHz 003 "/o (B 9)
Power output at the Dolby Pro Logic operation
D|N1 kHz(T.H.D.1 %)
Front 2 x60 W (4 11)
Center 60 W (8 S1)
Surround 2 x60 W (8 El)
lntermodulatlon distortion
rated power at 60 Hz : 7 kHz = 4:1, SMPTE 0.5 % (8 (2)

Power bandwidth

both channels driven, -3 dB 10 Hz - 40 kHz (8 Q)

Damping lactor 30 (8 0)
Load impedance
Front AorB 4-169
A and B B - 16 £1
Center 8 - 16 (I
Surround 8 - 16 (1
Frequency response
PHONO RIAA standard curve (30 HZ - 15 kHz) 10.5 dB

CD, TAPE, TVNCRZ, VCR1, DVD
Input sensitivity and impedance

1!) Hz-4O kHz, :3 dB

PHONO 3 mV/47 k9

CD, TAPE, TVNCRZ, VCR1, DVD 200 mV/22 kn
SIN at rated power (8 Q)

PHONO 70 dB (lHF, A 2 80 dB)

CD, TAPE, TVNCRZ, VCR1, DVD
Tone controls

BASS

TREBLE
Output voltage

75 dB (lHF, A : 85 dB)

50 Hz, +10 to -10 dB
20 kHz, +10 to -10 dB

Antenna terminal 75 n (unbalanced) TAPE REC (OUT), VCF" out 200 mV
Channel balance (250 Hz- 6.3 kHz) 11 dB
AM TUNER SECTION Channel separatlon 55 dB
Frequency range Loudness control (volume at -30 dB) 50 Hz, +9 dB
AM 522 kHz -1511 kHz (9 kHz steps) Headphones output level and impedance 430 mV/330 Q
530 kHz _ 1620 kHz (10 kHz steps) Subwooter lrequency response 7 Hz - 100 Hz, :SdB
Sensitivity 20 pV, 330 pV/m
Selectivity (at 999 kHz) 55 dB GENERAL
Image rejection (at 999 kHz) 40 dB Power consumption 220 W (In standby condition : 3 W)
IF rejection (at 999 kHz) 55 dB Power supply
For (E) and (EG) areas AC 230 V, 50 Hz
VIDEO SECTION Fortes) area AC 230 - 240 v, 50 Hz
Output voltage at 1V input (unbalanced) 1 t 0.1 Vp-p Dlmqnswns (W X H X D) 430 X 158 X 312 mm
Maximum input voltage 1.5 Vp-p Weight 9.6 kg
Input/output impedance 75 Q (unbalanced) Notes~
AMPLIFIER SECTION 1. Specifications are subject to change without notice.
Weight and dimensions are approximate.
Paws}: 1sz 33?! :2; (EB) area] 2 x 100 W (4 9) 2. Total harmonic distortion is measured by the digital spectrum analyzer.
20 Hz - 20kHz continuous power output
both channels driven 2 x 65 W (8 9)
AWARNING

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

Technicsi

repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

© 1997 Matsushita Electric Industrial Co.. Ltd.
All rights reserved. Unauthorized copying
and distribution is a violation of law.

Contents

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SA-AX710

l Contents

Accessories
Betore Repair
Protection Circuitry
Caution for AC Main Lead
Front Panel Controls
Equipment Connection
Speaker Connections
Basic Operations ......
Enjoying RDS Broadcasts
Enjoying Sound with DOLBY PRO LOGIC
Enioying Sound with 6 Channel Discrete .....

l Accessories

0 AC power supply cord
[for (E) and (EG) areas]: (RJA0019-2K) .. 1 pc.

0 AM loop antenna set

0 Batteries
........................................... 2 pc.

I Before Repair

(RSAOOt 0) .................

0 Remote control transmitter
(RAK-SA750WHP)

Operation Checks and Main Component Replacement Procedures

Fan Motor Troubleshooting .. 24
Troubleshooting ..... 25 - 28
Schematic Diagram 29 - 42
Printed Circuit Board and Wiring Connection Diagram .. 43 - 50
Wiring Connection Diagram . ...... 51
Block Diagram ........... 52 - 58
Replacement Parts List 59 - 64
Packaging .................... 64
Cabinet Parts Location. .......................... 65, 66
0 FM indoor antenna
.......................... 1 pc. (RSA0007) 1 pc.
0 Attachment plug
.......................... 1 pc. (SJP9009) 1 pc.

(1) Turn off the power supply. Using a 10 (2, 10 W resistor, connect both ends of power supply capacitors (C703, C704, C705, 0706)

in order to discharge the voltage.

(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 50 Hz in N0 SIGNAL mode should be shown below with respect to supply

voltage 230 V or 240 V.
Power supply voltage AC 230 V AC 240 V
Consumed current 50 Hz 120 ~ 350 mA 130 - 380 mA

l Protection Circuitry

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

0 No sound is heard when the power is switched ON.
0 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
shortedfi or if speaker systems with an impedance less than the indicated rated impedance of this unit are used.

If this occurs, follow the procedure outlined below:
1. Switch OFF the power.

2. Determine-the cause of the cause of the problem and correct it.

3. Switch ON the power once again.

Note:

When the protection circuitry functions, the unit will not operate unless the power is first switched OFF and then ON again.

_2_

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SA-AX71O

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THERE

To adjust the tone quality

Turn BASS to adjust the low frequency sound.
® Turn TREBLE to adjust the high frequency sound.

To adjust the sound balance E

Turn BALANCE to adjust the left/right sound balance.

To mute the sound level

Press MUTING.
The message MUTING ON NOW" runs repeatedly from right to
left across the display as long as the muting function is on.

Press once again to return to the previous volume level.

When the receiver is turned off, the muting operation will be
automatically cancelled

To tlsten through headphones E

G Use volume to reduce the volume level.

® Connect the headphones (not included).
Plug type: 6,3mm stereo

© Use VOLUME to adjust the volume level.

If you do not want sound from the speakers, press SPEAKERS
button(s) and check the speaker indicator(s) goes out.

If a subwoofer is connected to your system, turn off power to it (or
the subwoofer amp you are using) or lower the volume to the
minimum level

Avoid listening for prolonged periods of time to prevent hearing
damage.

To correct sound in case of low volume

This button balances low volume sounds by boosting bass sound
pressure.

Press LOUDNESS.

The message LOUDNESS will appear on the display, followed
shortly thereafter by the current setting OFF"i (®-®)

Pressing the button again within 4 seconds will turn loudness con-
trol ONi When ON, "-"indication will light up in the display,
(Ci-(D)

To return to the previous condition, press once again, then I
indication turn off.