Technics SAEX 700 Service Manual

Page 2

SA-EX700

Ah WARNING

This service intomation is designed tor experienced repair technicians only and is not designed for use by the general public. lt does not contain
wamingsorcautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electn city should
be serviced or repaired only by experienced professional technicians. Any attempt to sen/ice or repair the product or products dealt with in this service
information by anyone else could result in serious injury or death.

Load impedance
Front
A or B
A'and E
Center
Surrou nd
Subwooter
Frequency response
PHONO

co, TAPE, VDP, TV, vcn 1, vcn 2
In put sensitivityand impedance

PHONO

CD, TAPE, VDP, TV, VCR 1, VCR 2
SIN at rated power (3 Q)

PHONO

CD, TAPE, VDP, TV, VCR 1, VCR 2
Tone controls

BASS

TREBLE

I Contents

0 BEFORE REPAIR AND ADJUSTMEN

v PROTECTION CIRCUITRY.
0 CAUTION FOR AC MAINS LEAD

4-169
8-1652
8-169
4-169
4-160

RIAA standard curve
(30 HZ~ 15 kHz) =o.a dB
10 Hz - 40 kHz, :3 dB

3 mV/47 k!)
200 mV122 kg)

70 dB (IHF, A: 80 dB)
75 dB (IHF, A: 85 dB)

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

Loudness control (volume at -30 dB) 50 Hz, +9 dB
Output voltage

VCR 1 OUT, TAPE REC (OUT) 200 mV
Channel balance (250 Hz - 6.3 kHz) :1 dB
Channelseparation 55 dB
Headphones output level and impedance 430 mV/aaocz
Subwoofer frequency response 7 Hz - 100 Hz

I General
Powersupply AC 50 Hz, 230 V (EG)

Ac so Hz, 230- 240 v (E EB)

Power consumption 250 W
Dimensions (WxHxD) 430x 158x358 mm
Weight 10.3 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.

4 PAGE
- WIRINGCONNECTION DIAGRAM .. 20
0 SCHEMATICDIAGRAM ................ 21 ~ 40
- PRINTEDCIRCUITBOARDT. 41 ~ 49

0 OPERATION CHECKS AND MAIN COMPONENT REPLACEMENT 4~ 8 C CABINET PARTS LOCATION 50
' FAN MOTORTROUBLESHOOTING .......................................... 9 ' REPLACEMENT PARTS LIST 51 ~ 53
0 TROUBLESHOOTING ........................................................ 10 ~ 13 ' RESISTORS& CAPACITORS ................. 54 ~ 58
- BLOCK DIAGRAM .................... 14~17> I PACKINGMATERIALS&ACCESSORIES. 59
- TERMINALFUNCTIONSOFICs. 18 0 PACKAGING ............................................ 59
- TERMINAL GUIDE OF 105, TRANSISTORS & DIODES ........... 19

I Before Repair and Adjustment

Disconnect AC power, discharge 4 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 V, 50 Hz in NO SIGNAL mode should be 120 ~ 350 mA.
Current consumption at AC 240 V, 50 Hz in NO SIGNAL mode should be 130 ~ 380 mA.

I Protection Circuitry

The protection circuitry may have operated if either of the following conditions are noticed:
o No sound is heard when the power is turned on.
0 Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage it, 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.
lf 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.

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