Technics SUVX-500 Service manual

Service Manual

Stereo Integrated Amplifier

SPECIFICATIONS

(DIN

500)

• MAIN AMP. SECTION

(POWER AMP. DIRECT Input)

20 Hz  20 kHz continuous power output

both channels driven

1 kHz continuous power output

both channels driven (THD: 1%)

63 H ~ 12.5 kHz continuous power output

both channels driven (THD: 0.7%)

Total harmonic distortion (Power A mp Direct Input)

rated power at 20 Hz~20 kHz 0.007% (8 Ω) half power at 20 Hz ~ 20 kHz 0.005% (8 Ω)

Intermodulation distortion (SO Hz: 7 kHz = 4:1. SMPTE)

rated power 0.007 % (8 Ω) Residual hum and noise 0.2 mV Damping factor 60 (8 Ω). 30 (4 Ω) Headphones output level and Impedance 540 mV/330 Ω Load Impedance

A or B, BIWIRING 4 Ω1 6Ω

Aand B 8Ω16Ω

PRE AMP. SECTION

Input sensitivity a

Phono maximum Input voltage (1 kHz, RMS)

and impedance PHONO MM 25 mV/47 kΩ PHONO MC 170 µV/220 Ω TUNER, CD, AUX, TAPE 1, TAPE 2/DAT 150 mV/22 kΩ POWER AMP DIRECT 1 V/18 kΩ

MM 160 mV.

MC 12 mV.

2 x

50 W (8 Ω)

2x65 W (8 Ω)

R O M

2X9 0 W (4 Ω)

2 x

60 W (8

× 80 W (4

IMF'

oM)

SUVX500

Areas

Country

Code

(E)

Continental Europe

Great Britain

(EB)

(EG)

F.R. Germany and Italy

Asia. Latin America.

(GC)

Middle Near E as t an d Africa

(GN)

Oceania

S/N (rated power, 4 Ω)

PHONO MM 78 dB (85 dB. IMF' 66) PHONO MC 66 dB (S = 250 µV. 67 dB, IHF` 66)

POWER AMP DIRECT

S/N at ~ 26 dB power (4 Ω)

PHONO MM 76 dB PHONO MC 66 dB

Ω)

TUNER, CD, AUX, TAPE 1, TAPE 2/DAT 84 dB

SIN at 50 mW power (4 Ω)

PHONO MM 75 dB PHONO MC 66 dB TUNER, CD, AUX, TAPE 1, TA PE 2/DAT 78 dB

Frequency response

PHONO MM RIAA standard curve

TUNER, CD, AUX. TAPE 1, TAPE 2/DAT

POWER AMP DIRECT 2 Hz~120 kHz (+0, 3 dB)

Tone controls

BASS 50HZ, +10 dB, 10dB TREBLE 20kHz +10 dB, 10 dB

Loudness control (volume at 30 dB ) 50 Hz. +9 dB Output vo ltage

TAPE 1, TAPE 2/DAT REC OUT 150 mV

+0 dB, 0.2 dB (20 Hz~20 kHz)

+0 dB. 0.2 dB (20 Hz~20 kHz)

Amplifier

Color

(K) Black Typ e

Area

3Hz100kHz(+0, 3dB)

Color

97 dB (99 dB. IHF'66)

106

(115

dB, IHF

±0.8 dB (30 Hz~15 kHz)

(K)

'661

Technics

micro

SU-VX500

e 8 9 0 1 7 5 8

• GENERAL

Power consumption Power supply

• for Great Britain and Oceania

F.R. Germany, Italy and Continental Europe:

for Others: AC 50760 Hz. 110 V/127 V/220 V/240 V

530 W

AC 50/60 Hz. 230/240 V

Dimension.

(W x H x D)

430x 125x316

Weight 8,1 kg (17.82 Ib.) 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.

(16-15/16" x4-15/16"x 12-7/16")

• CONTENTS

BEFORE REPAIR AND ADJUSTMENT 2 PRINTED CIRCUIT BOARDS 15-1 PROTECTION CIRCUITRY 2 WIRING CONNECTION DIAGRAM 1 ACCESSORY 2 BLOCK DIAGRAM 2 LOCATION OF CONTROLS 3 MEASUREMENTS AND ADJUSTMENTS 2 CONNECTIONS 4-6 REPLACEMENT PARTS LIST 22-24,2 DISASSEMBLY INSTRUCTIONS 7-10 CABINET PARTS LOCATION 25 2 SCHEMATIC DIAGRAM 11-14 PACKAGING ' 2

Page Pag

I BEFORE REPAIR AND ADJUSTMENT

(1) Tum off the power supply. Using a. 10oM, 10 W resistor, shortcircuit both ends of power supply capacitors C001, C002. C705

and C706 in order to discharge the voltage.

(2) Before turning on th e power switch of the unit,

A. Connect the voltage controller to the primary side. B.

Connect

the AC

ampere

meter

to the

primary side

conned

the DC

voltage

meter

to the

"±B"

circuit

of the

side. C. Turn the VR of ICQ (VR451, VR452. VR501 and VH502) to minimum (counterclockwise). D.

Alter

setting

the

output

zero

of the And increa se the output of voltage controller gradually. Then, check carefully whether the current value of primary side become more than following value or whether the DC

voltage of secondary side is increasing slowly.

E. II the value of current is increasing unusually or the DC voltage is not increasing, lower the output level of voltage

controller Immediately.

•The current value of the primary side at no signal. (Confirm the power supply voltage ot each area and provided voltage of the unit.)

Power supply voltage

Consumed current

voltage controller,

50 Hz

turn

AC 1 1 0 V

210-500

250-540 mA

on the

120V

power switch

AC 220V

90-370 mA

of the

unit.

80-360 mA

secondary

230

240

70-350 mA

I PROTECTION CIRCUITRY

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

•No sound Is heard when the power is turned on.

•Sound stops during a performance. The function of thi s circ uitr y 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 of the amplifier are used.

I ACCESSORY

It this occurs, follow the procedure outlined below:

1. Turn off the power.

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

3. Turn on the power once again.

Note:

When the protection circuitry functions, the unit w i ll not operate unless

the

power

first

turned

off and