Technics SEA 100 Service Manual

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ORDER NO. HA08601326C9

Service Manual

Amplifier
Stereo Power Amplifier S E - A1 00
Color Areas
(K) [D] .Continental Europe

(K) [EW] .4 .Switzerland

(K) [EK] . . .United Kingdom
(K) [XL] . . Australia

(K) [EGA] . .F.R. Germany
(K) [EB] . . 4 Belgium

(K) [EH] . . .Holland
(K) [EF] ... France
(K) [Eii ...tltaly
(K) (XAI -- Asia, Oceania,
Africa, Middle
Near East and
Color Latin America
(KI IPA] . . . Far East PX
IK) . I . Black Type (K) [PEI ... European Military
SPECIFICATIONS (DIN 45 500)

I AMPLIFIER SECTION

20 Hz~20 kHz continuous power output POW?! bandwidth

both channels d'iyen 2 x 240w (4Q) both channels driven, -3 dB (T.H.D. 0.01%)
2 X17OW(BO) 5 HZ~100 kHz (80)
40 Hz~16 kHz continuous power output Resldual hum and "0i 0-3 mV
both channels driven 2 x 240w (4n) Damping Iaclor 50 (40). 100 (80)
2 X Wow (80) input sensitivity and impedance 7.0 V/47k0
1 kHz continuous power output S/N 110 dB (QB (18. IHF, A)
both channels driven 2 X 260W (40) Frequency response
2 X 180W (80) 20 Hz~20 kHz, +0 (15,-0.1 d8
Total harmonic distortion 0.8 Hz~150 kHz. +0 dB, -3 (18
rated power at 20 Hz~20 kHz 0002% (49) Channel balance, 250 Hz~6,300 Hz 0.5 08
0,0007% (80) Channel separation, 1 kHz 60 dB
rated power at 40 Hz~16 kHz 0002% (40) Headphones output level and impedance 870 mV/3300

0.0mm (80)

rated power at 1 kHz 0.0004% (40)

unmeasurably small less than 0,0002% (80)

hall power at 20 Hz~20 kl-lz 0.0007% (80)
hall power at 1 kHz

immeasurably small. less than 0.0002% (50)

-26 68 power at 1 kHz 0.001% (40)

so rnw power at 1 km 0,0015% (40)
lntermodulation distortion

rated power at 250 Hz: 8kHz=4:1, an 0,002%

rated power It 60 Hz: 7 kHz=d:1, SMPTE, 80 0,002%

TIM (Transient lntermodulatlon Distortion)
immeasurably small

M-uudma Electric Trding 00., Ltd.
PO. Box 288, Central Osaka Japan

Technics'

Load impedance
MAIN or REMOTE
MAIN and REMOTE
Meter
reading range

4Q~I 60
80~160

O 0001 W~300 W (80)
*60 dB~+2 dB
(logarithmic compressmn)
trequency response (reading accuracy)
:3 (18 (more than ~40 dB)
:5 dB (less than -40 dB)
100 uses.
300 msec

attack time
recovery time (0 dB ~ ~20 dB)

Panasonic Tokyo Oflico

Motsushiu Electric Trading 09., Ltd.
6th Floon World Trade Center Bldg.,
No. AH, Hamamatsu-cho 2-Chome,
Minatoku, Tokyo 105, Japan

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m

I GENERAL
Notes:
power consumpllon 1350W Total harmonic distortion is measured by the digital spectrum
Power supply AC 50 Hz/60 Hz, 110V/127V/220V/240V analyzer (HR 3045 SYSIeml
Dimensions (WXHXD) 430 X 209 X 475 mm Specifications are subject to change without notice.
Weight 31.2 kg Weight and dimensions are approximate.
I CONTENTS
Page Page

SAFETV PRECAUTION ..................... 2 PRINTED CIRCUIT BOARDS ...... . . ..... . . . . 12 ~ 11
FEATURES ................. 3 RESISTORS AND CAPACITORS . . . . A . . . . 18
LOCATION OF CONTROLS. . . . 4 BLOCK DIAGRAM . . ........ . . 19 ~ 20
DISASSEMBLY INSTRUCTIONS. . t . 5, 6 SCHEMATIC DIAGRAM . . . . . . 21 ~ 25
BEFORE REPAIR AND ADJUSTMENT. . . 6 PROTECTION CIRCUITRY . . . . 26
MEASUREMENTS AND ADJUSTMENTS ..... . , . . 6 '8 HOW TO OPERATION INDICATORS . . 26
CIRCUIT BOARDS AND WIRING REPLACEMENT PARTS LIST. . . . . A . 26, 27

CONNECTION DIAGRAM ...... . ....... 9 ~ 11 EXPLODED VIEWS . . . . . . . . . . . ............. 28 ~30

meri

SAFETY PRE CAUTION (This "safety precaution is applied only in USA.)

Before servicing, unplug the power cord to prevent an electric shock.

When replacing parts, use only manufacturer's recommended components for safety

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

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

t 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.

0 INSULATION RESISTANCE TEST

1.
2.
3.

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

Turn on the power switch.

Measure the resistance value with ohmmeter between the jumpered AC plug and each exposed metal cabinet part, such as
screwheeds antenna, control shafts, handle brackets, etc. Equipment with antenna terminals should read between 3M!)
and 5.2Mfl to all exposed parts. (Fig. A) Equipment without antenna terminals should read approximately infinity to
all exposed parts. (Fig. 8)

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

4.

Antenna
terminal I
.
Exposed Exposed
metal metal
part part
Onmmatar On mmeter
(WM (mm
Resistance = sue-5.2m: Resistance = Approx 00

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.