Technics SEA 1000 Service Manual

Page 1

[for (P) area code model only]

Specifications (HF 78)

Rated minimum sine wave HMS power output

20 Hz -20 kHz both channels driven
001% total harmonic distortion

Total harmonic distortion
rated power at 20 Hz - 20 kHz

70 Wper channel (8 Q)

0.01% (a :2)

intermodulatlon distortion (50 Hz:7 kHz = 4:1, SMPTE)

rated power
Residual hum and noise
Damping factor

Dynamic headroom

Headphones output level/Impedance
Load Impedance
A or B. Bl-WIRING
A and B
Input sensitivity/Impedance
Power amp. direct
S/N
Power amp. direct
Frequency response
Power amp. direct

I GENERAL

Power consumption
Power supply
Dimensions (W x H x 0)

Weight

0 0079-. (8 St)

0.3 mv

70 (a or

35 (4 or

0.3 dB (5 :2)

0.5 dB (4 e:

540 mvxsso o to 63)

4-169
87169

90 mV (1 V, IHF '66)/33 M2
95 dB (110 dB, iHF 65)

5 HZ - 70 kHz (+0, «3 (58)
+0 (18,-0.5 dB (20 Hz - 20 kHz)

235 w

AC 120 v, 50 Hz

«muse r 344 mm

(1 ass/'64" v 5723/64 1. 15-35mm
9.3 kg(216lb)

Notes:

ORDER NO. AD9507181CS

Service Manual

Stereo Power Amplifier

Amplifier

SE-A1 OOO

Colour
(K) : Black
Areas
Suffix for Area Colour
Model No.
(P) USA.
Europe
(K)
Britain
(EG) Germany and Italy
[for (E), (EB) and (EG) area code model]
Specnications (DIN 45 500)
20 Hz -20 kHz continuous power output
both channels driven 2): 70 W (B Q]
I kHz continuous power output
both channels driven (THD: 1%) 2 < 85 W (a Q)
2 x 120 w (4 o)
63 Hz-12.5 kHz continuous power output
both channels driven (THU: 07%) 2x80 W (8 Q)
2 x 105 w (4 :2)
Total harmonic distortion
rated power at 20 Hz- 20 kHz 0.01% (8 $2)
Intermodulatlon distortion
(50 HZ: 7 kHz = 4:1, SMPTE) 0.007% (8 S2)
Residual hum and noise 0.3 mv
Damping factor 70 (8 Q)
35 (4 Q)
Headphones output level/impedance 54D mV/aao Q ((3 6.3)
Load impedance
Aor B, Bl-WIHING 452- 169
A and B H (2 -- 15 52
input sensitivity/impedance 1 was k9

S/N (rated power, 4 52)
Frequency response
Power amp. direct

I GENERAL
Power consumption
Power supply
For (E) and (EG) areas
For (EB) area
Dimensions (Wx H x D)
Weight

1. Design and specilicalions are subjectto change without notice.
Weight and dimensions are approximate.
2. Total harmonic distortion is measured by the digital spectrum analyzer.

95 dB (110 dB. iHF '66)

5 Hz - 70 kHz (+0, - 3 dB)
+0 dB, - 0.5 dB (20 HZ - 20 kHz)

280 W

50 HZ/SO HZ AC, 280 V

50 HZ/GO H7 AC, 280 V- 240 V
430 K136 x 344 mm

9.8 kg

AWAHNING

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

Technics®

© 1995 Matsushita Electric Industrial Co, Ltd.
All rights reserved. Unauthorized copying
and distribution is a violation of law.

Page 2

SE-At 000
l Contents

Safety Precaution
Before Repair
Protection Circuitry
Accessories ......
Caution for AC Mains Lead
Connections .........
Front Panel Controls
Operations.
Operation Check and

Main Component Replacement Procedures .......................... 7~1i

'U
n:
(D
m

M} .
mmmmmmmm

I Safety Precaution

[for (P) area code model only]
1. Before servicing, unplug the power cord to prevent an electric shock.

Measurements and Adjustment
Schematic Diagram .....
Printed Circuit Board Diagram
Wiring Connection Diagram
Block Diagram
Replacement Parts List
Cabinet Parts Location
Packaging

24~27, 30
28. 29
. 30

2. When replacing parts, use only manufacturers recommended components for safety.

3, Check the condition of the power cord. Replace if wear or damage is evident.

4. After servicingI be sure to restore the lead dress. insulation barriers, insulation papers, shields, etc.

5. Before returning the serviced equipment to the customer, be sure to make the following insulation resistance test to prevent the customer from

being exposed to a shock hazard.
I INSULATION RESISTANCE TEST

1. Unplug the power cord and short the two prongs of the plug with a jumper wire.

2. Turn on the power switch.

3. Measure the resistance value with ohmmeter between the jumpered AC plug and each exposed metal cabinet part, such as screwheads antenna.
control shafts, handle brackets, etc. Equipment with antenna terminals should read between 3 M9 and 5.2 ME: to all exposed parts. (Fig. A)
Equipment without antenna terminals should read approximately infinity to all exposed parts. (Fig. B)

Nata: Some exposed parts may be isolated from the chassis by design, These will read infinity.

/

Antenna

terminal \4 l-
l
|
l

,6

Exposed /
metal part

Ohmmeter
(FiglA)
Resistance = 3 M9 - 52 M9

/

Exposed /
metal part

Ohmmeter
(Fig- 5)

Resistance = Approx. co

4. If the measurement is outside the specified limits, there is a possibility of a shock hazard. The equipment should be repaired and rechecked before

it is returned to the customer.

I Before Repair

(1) Turn off the power supply. Using a 10 $2, 10 W resistor, connect both ends of power supply capacitors (C701, C702) 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 50/60 Hz in NO SIGNAL mode should be shown below with respect to supply voltage 120 V/230 V/240 V.

Power supply voltage AC 120 v, 60 Hz AC 240 v. 50 Hz

300 ~ 600 mA

AC 230 V, 50 Hz

Consumed current 160 - 320 mA 160 ~ 320 mA

I Protection Circuitry

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

I 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 "shorted", 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 pDWer is first switched OFF and then ON again.