Technics SEA 5 Service Manual

Page 1

Service Manual

Stereo DC Power Amplifier

SE-A5(K)

[DlEEGlEEWMEKl
[EH],[EF],[EB],[XL],[XA]

Areas

[D] and [EG] are available in Scandinavia and EuropeanW
except Switzerland, United Kingdom, Holland, France
and Belgium.

[EW] is available in Switzerland.

[EK] is available in United Kingdom.

[EH] is available in Holland.

* [EF] is available in France.

' [EB] is available in Belgium.

* [XL] is available in Australia.

' [XA] is available in Asia, Latin America, Middle East and

Africa.

The black type model is provided with

(K) in the Service Manual. SEVA5(Kl
The colors of this model is black type only.

English

specifications (Specifications are subject to change without notice for further improvement.)

(DIN 45 500)
I AMPLIFIER SECTION

20 Hz~20 kHz continuous power output Damping tactor 7O (40). MO (80)
both channels driven 2 - 160W (40) Input sensitivity and impedance 1 \I/47kQ
2 ,- 120W (80) S/N 108 dB (123 dB, lHF. A)
40 Hzr-IB kHz continuous power output Frequency response
both channels driven 2 . 160W (40) DC~20 kHz, +0 dB. ,01 dB
2 \ I20W (80) DC~200 kHz. 10 dB, *3 dB
1 kHz continuous power output Channel balance, 250 Hz~6,300 Hz :05 dB
both channels driven 2 » 180W (40) Channel separation. 1 kHz 75 dB
2 > 130W (80) Headphones output level and impedance 730 mV/3300
Total harmonic distortion Load impedance
rated power at 20 Hz~20 kHz 0.003% (40) MAIN or REMOTE 40~160
0.002% (80) MAIN and REMOTE 80~IBQ
rated power at 40 Hz~16 kHz 0.003% (40) Meter
0.002% (80) reading range 0,0001 W~300 W (80)
rated power atl kHz 0.003% (40) *60 dB~+5 dB
0 002% (80) (logarithmic compression)
hall power at 20 Hz~20 kHz 0 001% (80) trequency response (reading accuracy)
hall power at 1 kHz 0 0005% (8K)) 20 HZ'20 kHz :2 dB (more than "50 dB)
, 26 dB power at 1 kHz 0.001% (40) 20 Hz~20 kHz :3 08 (less than ~50 dB)
50mw power at 1 kHz 0.001% (40)
lntermadulation distortion I GENERAL
rated power at 250 Hz: 8 kHzi421, 40 0.003%
rated power at 60 Hz: 7 kHzLAJ, SMPTE. an 0.002% Power consumption lOOOW
TIM (Transient lntermodulation Distortion) Power supply AC 50 Hz/60 Hz, thV/120V/220V/240V
unmeasurahly small Dimensions (WXHXD) 430 7 178 x 416 mm
Power bandwidth Weight 18.4 kg
both channels driven, *3 dB
T.H.D. 0.007% 5 Hz~1oo kHz (80)
Residual hum and noise 0.1 mV

Matsushita Electric Trading 00., Ltd.

TeChniCS PO. Box 288. Central Osaka Japan

Page 14

I BLOCK DIAGRAM

0307 fl 03l3

Current C t
mirror durren
load I'- erection
0303,305 0309 03 06|3 06l7 062l.625
Emitter Class A Class A amp. New-class A New»class A
Left channel Cascade . follower amplifier (pre-drive) " drive amplifier I'- power -
H amplifier L Ch.
Normal ©-I I- lnput level .5 _
I- control 030' 2 _'°///°-@ Remote speaker
Input terminal W4C. Differential °3I5 039 060I 0605 E /
L amplifier Currlent Wavef _ Limiter ICQ bias _ lg // M . ak r
regu ator trans er control "" M ain spe e
D C ©- 3 ( /
C
0603 0609 E | /
WM /
06l5 I; 06l9 0623.627 Headphones
| I | ack
To meter Ii ht Class Aamp. New»class A New-class A Mg,-
9 J (predrive) ' - drive amplifier _ power. '_I I I I
amplifier 1 | I
Output power I I
selector limited power I_ _ H _ _ ______________________________ J | I
0-617 | I___ _______________________________________ J I Frochh.
(SI )I I I From a ch. I output
I
Relay 1 o I I output IC 55l e I
I D55| - - _ - __ _ _ - ______
IL I I I- _l I
_.I I
l Remote speaker I I Muting Voltage 49... |
I switch remote I I 2 DC voltage regulator I
I . | detection I I
|
I (53) I I I 055' I | l
l I / Power ON/ .
I A) / I mfg/hm ' I; OFF detec- 0R circuit -> Shumitt I- Relay 6 Relay 4
I J 9 I tion Circwt drive
I ; Relay 3 / I
/
Power supply I / l0551 I -
- - - | / QTOI Discharge SUb
for input amplifier l Main speaker SVITA731 7P I circuit straight I
I switch [Relay 2
Voltage 1 M 1 L- 3 4 - 7 ---- 5-l
regulator I | O
| ($2) main
Voltage I I - Powe ON/ .9
regulator I o -- OFF muting
I .
63 9 | D50, protection Current L ch. meter
I stabilizer WC}, 9
g I r 050i h I- -'-__-" ___""
Power supply for I I I I - I
left flannel power I Hold and Logarithmic 4
amp I '9" - DC ampli- output Det ct
I I I Power 020' I- 2I fierl amplifier 8 or
transformer
69 e | H Switching I
i control
(55 -__-_-_-
{Z} *Itg I_ (72) I 0702 i ICZO1
I L --®-0\,p--O: ACIIne SVITA7318P
Voltage
H adjuster