Technics SUA 700 Mk3 Service Manual

Page 1

Specificatibns (DIN 45 500)

20 Hz - 20 kHz continuous power output both channels driven
2 x 45 W (8 ohm)
1 kHz continuous power output both channels driven (THD:1°/.)
2x55W(80hm). 2x80W(4ohm)
53 Hz- 12. 5 kHz continuous power output both channels driven
(THD: 0.7%) B
2 x so w (5 ohm). 2 x 70 w (4 ohm)
Total harmonic distortion rated power at 20 Hz - 20 kHz
0. 01% (5 ohm)
lntermodulation distortion (50 Hz: 7 kHz: 4: 1, SMPTE)
rated power
0. 007% (8 ohm)
Residual hum and noise
1 mV
Damping tlctor
so (8 ohm) so (4 ohm)
Headphones output level/impedance
540 mV/330 ohm
Load impedance
AorB.4-1Gohm
Aand 6.8-160hm
Input sensitivity/impedance
PHONO MM, 25 mV/47 k ohm .
TUNER, CD, AUX, TAPE 1. TAPE 2/DGO, 150 mV/22 k ohm
Ph'ono maximum input voltage (1 kHz, HMS)
MM, 150 mV (150 mV. IHF 66)
SIN (rated power, 4 ohm)
PHOND MM, 76 dB (78 dB. lHF 66)
TUNER, CD, AUX, TAPE 1 , TAPE 2/DCC
91 dB (99 dB. lHF '66)

ORDER NO. AD96051 8062

Service Manual

Stereo integrated Amplifier

Amplifier

SU A7OOM K3

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

Areas

(E) Europe

(EB) . Great Britain

(EG) Germany and Italy
(EM) Switzerland

S/N at - 26 dB power (4 ohm)
PHONO MM, 63 dB
TUNER, CD, AUX, TAPE 1, TAPE 2/DCC, 70 dB
S/N at 50 mw power (4 ohm)
FHONO MM, 64 dB
TUNER, CD, AUX, TAPE 1 , TAPE 2/DCC, 64 dB
Frequency response
PHONO MM. RIAA standard curve +1 to -1 dB (30 Hz - 15 kHz)
TUNER, CD, AUX, TAPE 1, TAPE ZIDCC
3 Hz - 80 kHz (+0, -3 dB) 20 Hz- 20 kHz (+0, - 0.3 dB)
Tone controls -
BASS. 50 Hz, +10 to ~10 dB
TREBLE, 20 kHz, +10 to ~10 dB
Output voltage
TAPE 1, TAPE 2IDCC REC OUT, 150 mV
channel balance (AUX 259 Hz - 6.3 kHz). +1 to >1 dB
Channel separation (AUX 1 kHz), 50 dB

GENERAL
Power consumption, 200 W
Power supply

For (E), (E6), and (EM) areas, 50 Hz AC, 230 V

For (EB) area, 50 Hz AC, 230 V- 240 V
Dimensions, 430 (Wtde)/ 125 (High)/ 318 (Depth) mm
Weight, 6.7 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.

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 nondechnical 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 product or products dealt with in this service information by anyone else could result in serious injury ordeath.

Technics

© 1996 Matsushita Electric Industrial Co, Ltd.
All rights reserved. Unauthorized copying
and distribution Is a violation of law.

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7 VSU-A709MK3

I Contents

Page

Before Repair . 2 Schematic Diagram ..............
Protection Circ I 2 Printed Circuit Board Diagra
Accessories ...... . 2 Wiring Connection Diagram
Caution for AC Mains Lead 3 Block Diagram ............
Front Panel Controls .. 4 Function of IC Terminals
Connections ..... 5, 6 Replacement Parts List.
Listening to Sound 7, a Cabinet Parts Location
Recording ......... . e Resistors and Capacitors
Troubleshooting Guide . 10 Packaging
Operation Check and '

Maln Component Replacement Procedures .......................... 11~14

l Before Repair

(1) Turn oft the power supply. Using a 1 O Q, 10 w resistor, connect both ends of power supply capacitors (C701. 0702) in order to discharge the voltage.
(2) Before turning the power supply on, alter 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 280 V- 240 V.

Power supply voltage : AC 230 V =9 50-250 mA (Consumed current 50Hz)
Power supply voltage : AC 240 V => 40-240 mA (Consumed current 50Hz)

l Protection circuitry

The protection circuitry may have operated if either of the following conditions is noticed:
as No sound is heard when the power is switched 0N.
=1: Sound stops during a performance.
The functions of this circuitry Is to prevent circuitry damage it, for example, the positive and negative speaker connection wires are "shorted. or it
speaker systems with an impedance less than the indicated rated impedance ofthis unit are used.
If this occurs, follow the procedure outlined below:
1. Switch OFF the power.
2. Determine the cause otthe 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.

I Accessories
0 AC power supply cord ......................................... -. ........................... t
for (E),(EG) and (EM) areas: (RJAODts-ZK) for (EB) area: (RJAOD49-K)

(Remote control transmitter 0 Batteries
(RAK-S U129WH) ........................................ 1 (UMA, AAA", R03) ...................................... 2
Note: These are available on sales route.

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