Technics SEA 2000 Service Manual

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ORDER NO. AD930720808

Service Manual

. . Am lifier
Stereo Power Amplifier p
SE-AZOOO
Colour
(K)... Black Type
Area
332:: L0; Area Colour
(EG) Europe.
(EB) Great Britain.
Asia, Latin America, (K)
(G) Middle Near East

. and Africa.

SPECIFICATIONS (DIN 45 500)

. 20 Hz-20 kHz continuous power output I GENERAL
both channels driven 2 x 100 W (8 o) ,
2 X 140 W (4 9) Power consumption 380 W
1 kHz continuous power output Power supply
both channels driven (THD: 1%) 2x110 W (8 (2) For (59) area. AC 50 H2160 Hz, 230 v
2 ><160 W (4 D) For (EB) area. AC 50 H2160 Hz, 230 v-24o v
63 Hz-12.5 kHz continuous Power output ' For (G) area. AC 50 H2160 Hz, 110 v-127 v1220 v-240 v
both channels driven (THD: 0.7%) 2 x 105 W (8 (2) Dimensions (w x H x D) 448 x 186 x431 mm
, 2x 145 W (4 0) Weight 22 kg
Total harmonic distortion
- rated power at 20 Hz-20 kHz 0.005% (8 0) Notes:
' 0009% (4 Q) 1. Design and specifications are subject to change without notice.
halt Power at 20 Hz-20 kHz 0.003% (8 0) Weight and dimensions are approximate.
lntermodulatlon distortion (50 H2: 7 kHZ=4i1t 5MPTE) 2. Total harmonic distortion is measured by the digital spectrum
rated power 0.005% (8 Q) analyzer.
Power bandwidth (both channel driven) 3, For areas excepl (EG)
-3 dB THD 0-05% 5 HZ-80 kHZ (8 Q) The specification values given have been measured while us-
Residual hum and noise 015 mV ing a 240 V power supply.
Damping factor 100 (8 Q)
50 (4 n)
Headphones output Ievelllmpedance 680 mV/SSO 0
Load impedance
A or B 4 0-16 9
A and B 8 0-16 Q
Input sensitivity/Impedance 1.0 V133 k9
SIN (rated power, 4 Q) 107 dB (115 dB, lHF 66)
Frequency response 08 Hz-150 kHz (+0, -3 dB)
+0 dB, -0,2 dB (20 Hz-20 kHz)

v

Techntics

Page 2

SE-A2000

I CONTENTS

ACCESSORIES ................
PROTECTION CIRCUITRY..
BEFORE REPAIR AND ADJUSTMENT
CAUTION FOR AC MAINS LEAD.
FRONT PANEL CONTROLS AND U
CONNECTIONS .................................................
OPERATION '

DESCRIPTION OF TECHNICAL FEATURES. ..... 8
DISASSEMBLY INSTRUCTIONS...
MEASUREMENTS AND ADJUSTM N
BLOCK DIAGRAM ..................................

SCHEMATIC DIAGRAM ........................
PRINTED CIRCUIT BOARDS DIAGRAM.
TERMINAL GUIDE OF ICS, TRANSISTORS AND

DIODES
WIRING CONNECTION DIAGRAM
REPLACEMENT PARTS LIST.
CABINET PARTS LOCATION
REPLACEMENT PARTS LIST
RESISTORS AND CAPACITORS ..
PACKAGING

I ACCESSORIES
- AC power supply cord ................................. 1 0 Power plug adaptor ................................... 1
[FOR (EB) area.] [FOR (EG, G) areas] [FOR (G) area.]

(VJA0733) (RJA001 9-2K)

(SJP5213-2)

I PROTECTION CIRCUITRY

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

.No sound is heard when the power Is turned on.
OSound 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 the amplifier are used.

If 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.

I BEFORE REPAIR AND ADJUSTMENT

Disconnect AC power, Discharge both Power Supply Capacitors C701~C704 through a 100, SW resistor to

ground.

DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdrive blade, for instance), as this may distroy solid state

devices.

After repairs are completed, restore power gradually using a variac, to avoid overcurrent.

Current consumption at 5OHz/60Hz in NO SIGNAL mode should be shown below with respect to supply voltage

230V/240VI110-127V/220-240V.

Power supply voltage AC 230V Ac 240V (ACA1C1 352:7 (AcAgzoZgXDV)
50Hz 150~450mA 50 Hz 140~430 mA 50 Hz 260~880 mA 50Hz 140~430mA
Consumed current 50/60 Hz
60 Hz 120~360 mA 60 Hz 112~344 mA 60 Hz 208~704 mA 60 Hz 112~344 mA

U