Technics SEHD 51 Service Manual

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ORDER NO. AD980203102

Service Manual

Amplifier Amplifier
I SE-HD51
SL-HD51 ST-HD51 : , COIOUI
' (N) ............................................ Gold
Areas
E ................ Europe.
EG .Germany and Italy, etc.
. . .Great Britain.
, EP ............. East Europe and Russia.
ns-HDaI SE-HDS1 30mm comm; System : SC-HD51

'l. transmitter

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

send or bring In the entire system.

SpeCIfIcatIons

Amplifier Section General

Power output Power consumption: 90 W

(m DIN 1 kHz, THD 1 %, both channels driven: 2 X 23 W (6 ohm) Power supply

RMS 1 kHz, THD 10 %, both channels driven: 2 X 30 W (6 ohm) [for (E, E6, EP) area]: 230 V, AC 50 Hz

Total harmonic distortion [for (EB) area]: 230 - 240 V, AC 50 Hz
Rated power at1 kHz: 1 % (6 ohm) Dimensions: 196(VV)/103(H)/255(D) mm
Halt power at 1 kHz: 0.09 % (6 ohm) Weight: 3.5 kg

Load impedaneed: 6 ohm

SIN (rated power): 90 dB "0'95:

1 . Specifications are subject to change without notice.

2. Weight are dimensions are approximate.

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

System/SC-HD51:
Tuner. ST-HD51 , Compact Disc Player. SL-HD51, Amplifier: SE-HD51, Cassette Deck: RS-HDB1, Speakers: *SB-HDS]

Notes: *...... Made in PAES l

l
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.
.I... Products powered by electricity should be serviced or repaired only by experienced professional 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.

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

Technic§

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SE-HD51

I Contents

§
in
m

Accessories
Before Repair .
Caution for Ac Main Lead
Protection circuitry ..
Location of Controls
installation .
Connections
Changing the Tone
Convenient Functions .
Operation Checks and

Main Component Replacement Procedures ................... 8 ~ 10

qualms-own»

I Accessories

0 AC power supply cord ............. 1 pc.
For (EB) area
(VJAD733)

For (E, EG, EP) area
(RJAOO19-2K)

I Remote control batteries 2 pcs.
[RDa/LHOS (AAA, UM-4)]
Note: These are available on sales route.

9

AM loop antenna

a Remote control transmitter ....... 1 pc.
For (E, EB) area
(RAK-CH215WH)

Antenna holder with stand

@@tfiv

To Supply Power Source
Schematic Diagram...
Printed Circuit Board Diagram...
Type Illustration of [6 s, Transistors and Diodes
Wiring Connection Diagram ...............................
Block Diagram
Replacement Parts List
Cabinet Parts Location
Packaging .................

I Speaker cords ........................ 2 pcs.
For (EG, EP) area (REEOSQS)

(HAK-CHI 93WH)

m:

0 AM loop antenna set (RSA0021)

.. 1 pc. Antenna holder without stand
.. 1 pc. Screw ..; .............................

1 pc.
1 pc.

0 FM indoor antenna ................... 1 pc, 0 Antenna plug adaptor .............. 1 pc. 0 Flat cable (Long thick) .............. 1 p0.
(RSAOOO7) For (EB) area only (REX0812)
(SJPQDDQ)
0 Flat cable (Long thin) .. 1 pc. 0 Flat cable (short). 1 pct
(REX0813) (REXOGOB)

3%

I Before Repair

(1)Tum off the power supply. Using a 10 Q, 10 W resistor, connect both ends of power supply capacitors (C701, C702) 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 SOHz in NO SIGNAL mode should be shown below with respect to supply

voltage 230 V.
Area (E) (EG) (EP) (EB)
Power supply voltage AC 230V AC 240 V
Consumed currect 50 Hz 50 ~ 170 mA 50 ~ 170 mA

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