Technics SEHD 81 Service Manual

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ORDER NO. ADQBOZOZBCZ

Service Manual

Amplifier Amplifier
SE-H D81
Colour
SLHD 57'° (N) ............................................ Gold
' - . Areas
E ................ Europe.
EG ............. Germany and Italy, etc.
., EB .. .Great Britain.
EP . . .Europe and Russia.
as-I-Ioat serum Remote control System SC'HD81
transmitter

[ Because of unique interconnecting cables, when a compact requires service, J

send or bring in the entire system.

Specifications

Ampliiier Section

Power output
DIN 1 kHz THD 1 %, both channel drlven: 2 X 45 W (6 ohm)
RMS 1 kHz THD 10 "/0, both channel driven: 2 X 60 W (6 ohm)
Total harmonic distortion
Rated power at 1 kHz: 1 % (6 ohm)
Half power at 1 kHz: 0.09 % (6 ohm)
Load impedanced: 6 ohm
SIN (rated power): 90 dB

System/sc-I-Iom:

General

Power consumption: 100 W
Power supply

i For (EB) area 1: 230~240 v, AC 50 Hz

I For (E, E6, EP) areas]: 230 V, AC 50 Hz
Dimensions: 196(W)1103(H)/255(D) mm
Weight: 4.1 kg

Notes:

1. Specifications are subject to change without notice.

2. Weight are dimensions are approximate.

3. Total harmonic distortion is measured by the digital spectrum
analyzer.

:Tuner: ST-HDet. Compact Disc Player: SL-HDai, Amplifier: SE-HDS1, Cassette Deck: RS-HD81, Speaker: *SB-HDBl

Notesntw» Made in PAES

AWARNING
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 prolessional technicians. Any attempt to service
or repair the product or products dealt with in this sen/ice information by anyone else could result in serious injury or death.

:Techniicsi

© 1998 Matsushita Electric Industrial 00., Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of law.

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sE-HD81 I

I Contents

Accessories .........................
Before Repair and Adjustmen
Caution for AC Main Lead ......
Protection Circuitry ..
Location of Controls
installation
Connections
Changing the Tune

Convenient Functions .......................................

Operation Checks and

Main Component Replacement Procedures

I Accessories

0 AC power supply cord ............. 1 pc.
For (EB) area:

(RJA0053-1X) (RJA0019-X)

3 Remote control batteries ........ 2 pcs.
[momma (AAA, UM-4l]
Note: These are available on sales route,

9

I FM indoor antenna.....r............. 1 pc.
(RSADOO7)

(REXOBl 3)

M

For (E, EG, EP) area:

'9
:3
m

2
2
3
4
4

4 Block Diagram
6
7

. ............................. 7 Packaging
.8 ~ 10
0 Remote control transmitter ....... 1 pc.
(RAK-CH214WH)

I AM loop antenna set (RSA0021)
AM loop antenna ..................... 1 pc.
Antenna holdarwith stand ...... 1 pc.

Q;

0 Flat cable (short) ...................... 1 pc
(REXOGDB)

H

-An
-nmo.

.. nhu an..." 4 m.
u. Pit-l5 auuptu. .............. . yu.

For (EB) area only:

(5.1139009)

Wiring Connection Diagram
To Supply Power Source
Type illustration of 105, Transistors and Diodes
Schematic Diagram . .........
Printed Circuit Board Diagram

Replacement Parts List
Cabinet Parts Location

0 Speaker cords ........................ 2 pcs.
(RFA0737-R)

%%

Antenna holderwithout stand 1. 1 pc.
Screw ................................. .. 1 pc.
E V
I Flat cable (Long thick) 1 pc.
(REX0812)

m

I Before Repair and Adiustment

(1) T urn off the power supply using a 10 Q, 10 W resistor, connect both ends 01 power supply capacitors (c715 ~718) 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 230 VI24O V.

Area (E) (E6) (EP) (EB)
Power supply voltage AC 230V AC 240 V
50 Hz 60 N180 mA 50 Hz 55 ~ 175 mA

Consumed current 50/60 Hz

60 Hz 48 N144 mA 60 HZ 44~140 mA

4!!