Technics SEA 3 Service Manual

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ORDER NO 808003-1758

ervice Manual

Stereo DC Power Amplifier

SE- A3K

[M],[ [MC]

Ana:

[M] is available in U.S.A.

" [MCI is available in Canada,

(lHF 73)
I AMPLIFIER SECTION

Rated minimum sine wave RMS power output
20 Hz~20 kHz both channels driven
0.002% total harmonic distortion
200W per channel (8 ohms)
20 Hz~20 kHz both channels driven
0.003% total harmonic distortion
320W per channel (4 ohms)
1 kHz continuous power output
both channels driven
0.001% total harmonic distortion
220W per channel (8 ohms)
0.003% total harmonic distortion
350W per channel (4 ohms)
1.1 dB (8 ohms)
1.8 as (4 ohms)

Dynamic headroom

Total harmonic distortion
rated power at 20 Hz~20 kHz
hall power at 20 Hz~20 kHz
hall power at 1 kHz
SMPTE intermodulation distortion
TIM (Transient lnlermodnlation Distortion)
unmeasurably small
+0 £18,411 (18 (DC~20 kHz)
DC~300 kHz, (+0 dB. ~13 dB)
70 mV (1V, IHF '66)
100 dB (123 dB, [HF '86)
47 kilohms

0,002% (8 ohms)
0.001% (3 ohms)
0.0003% (8 ohms)
0,002% (8 ohms)

Frequency response
Input sensitivity

S/N (IHF, A)
input impedance

TECHNNICAL SPECIFICATIONS Specifications are subject to change without notice for further improvement,

Low frequency damping lactor 200 (8 ohms)
100 (4 ohms)
Load impedance
MAIN or REMOTE
MAIN and REMOTE
Meter

reading range

4~16 ohms
8~16 ohms.

0.0001 W~300 W (8 ohms)
-60 d8~+5 dB
(logarithmic compression)
frequency response (reading accuracy)
10 Hz~20 kHz :1 dB (more than .40 dB)
10 Hz~10 kHz 51 dB (less than -40 dB)
50 ysec.
750 msec. (0 dB~-20 dB)

attack time
recovery time

I GENERAL

nsow, 1400 VA
AC 120v, 60 Hz

430 x 208 x 507 mm

(16»15/16" x 8-3/16 > 19-31/32")

352 kg
(78.3 lb.)

Power consumption
Power supply
Dimensions (WXHXD)

Weight

Note: ~
Total harmonic distortion is measured by the digital spectrum
analyzer (H. P 3045 system).

Panasonic Company

Technics
3&3 series

Corporation at America
One Panasonic Way, Secaucus,
New Jersey 07094

Panasonic Hawaii, Inc. Panasonic Canada

Division ol Matsushita Electric 320 Waiakamiio Road, Honolulu, Division ol Matsushita Electric,

Hawaii 96817 of Canada Ltd.
5770 Ambler Drive,

Mississauga, Ontario L4W 2T3

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I CONTENTS

Page
LOCATION OF CONTROLS .................... 2, 3
DISASSEMBLY INSTRUCTIONS ................. 4, 5
ADJUSTING INSTRUCTIONS ..................... 6
ADJUSTING POINTS ........... , . . . I . .7
PROTECTION CIRCUITRY INDICATOR ........... 8
HOW TO PREPARE LEAD-CONNECTOR SOCKETS. ...... 9
PRECAUTIONS FOR CONNECTIONS ............... 9
REPLACEMENT PARTS LIST (Electric Parts) .......... 9 , 10

I LOCATION OF CONTROLS

0 Front side view

Power indicator

Page
PRINTED CIRCUIT BOARD .................. 11~16
TERMINAL GUIDE 0F TRANsLsIaasiiND IC'S ........ 16
RESISTOR AND CAPACITOR PARTS LIST. . . . . . 17
BLOCK DIAGRAM ........... . . . ....... 18
SCHEMATIC DIAGRAM . . . . . . . ..... 19,20
EXPLODED VIEW ........................ 21 ~23
REPLACEMENT PARTS LIST
(Cabinet and chassis Parts) ..................... 23

Protection-circuitry indicator

Speaker indicators

Power

Headphones jack

0 Rear side view

am» an m mm mm:
m mum um;

mum .u m mum Ir
ml U m a»: I run

Speaker selection switches

Speker on»off switch

Main speaker terminals