Technics SECH 570 Service Manual

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ORDER NO. AD9603054C8

Service Manual

Amplifier Amplifier
DUP DDLBY sunnoumo I I 7
*Ws -cn57o *1-*2sa-Pca7o '
, , B Colour
i SL-cus7o *
. (K) : Black
*1 sa-Pssvo , \ *1 SB-PSS70 Areas
Or 1 ' ,- ., . . . - .
*2 53-1351 0' Suffix for Area Colour
' ' - Model No.
. > (E). (EP) Europe
HS-CHTIO SE-CH570 ' Remote COHII'OI (EB) Brilain '
Note: The design of SB~PS1O is differ from the above picture. Transmitter (K)
i . (EG) Germany and Italy
Because of unique interconnecting cables, when a component - Asia, Latin America.
requires service, send or bring in the entire system. (GO) Middle East. Africa and
' Oceania
Spectflcatlons System: SC-CH570
Power output _
DIN 1 kHz, THD 1%, both channel driven 2x35 w (e o) 5/" (9 PW)
nus 1 kHz, THD 10%, both channel driven 2x 48 w (e :2) MAIN . 90 dB
PRO LOGIC mode .
DIN 1 kHz, THD1 °/. I General
MAIN (both channels driven) 2 x30 W (6 9) Power consumption
SURROUND 30 W (4 Q + 4 9) [For (E), (EB), (EG) and (EP) areas] 160 W
CENTER 30 W (8 £2) , [FOR (Gerareal 350 w
HMS 1 kHz, THD 10 % [THD 10 %, MAIN (both channels driven) 6 E2, SURROUND 4 52
MAIN (both channels driven) 2X 40 W (6 £2) + 4 Q, CENTER 3 9.]
SURROUND 40 W (4 $2 + 4 52) Power supply -
CENTER 40 w (8 9) [For (E), (EG) and (EP) areas] 230 V, AC 50/60 Hz
[For (GC) area only] [For (EB) area] 230 ~ 240 V, AC 50/60 Hz
PMPO 1kHz 1400 W [For (GC) area] 110/127/220/230-240 V. AC 50/60 HZ
[MAIN (both channels driven) 6 S2, SURROUND 4 :2 + 4 :2, Dimensions (W>< HX D) 270x118.5x34215 min
CENTER 8 SE] Weight .
Total harmonic distortion [For (E), (EB) and (EG) areas] 3.9 kg
Rated power an kHz 1% (6 9) [FOR (GO) area] ' 4.3 kg
Halt power at 1 kHz 0.09% (6 52)
Load impedance Notes:
MAIN 6 S2 - 8 (2 Specifications are subject to change without notice.
SURROUND 4 £2 - 8 :2 Weight and dimensions are approximate
CENTER 8 £2 Total harmonic distortion Is measured by the digital spectrum analyzer.
Tuner/sound Compact disc _ _
System processor player AmpIIlIer Cassette deck Front speakers Center speaker Surround speakers
*' SB-PT57D

SB-PCS70 I *1 seessro
*ése- PT570A ,
*235 P0570 I rasa P810

*1 For (E) (EB) (EG) and IEP) areas: Made in PAES
*2 For (GC) area: Made In NABEL

SC-CHSIO ST~CH57O SL~CH57D SE-CHS'IO RS-CH77O *1, *ZSB-CH57O

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

© 1996 Matsushita Electric Industrial Co, Ltd.

0 ®
All rights reserved. Unauthorized copying
C nlcs and distribution is a violation of law;

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sE-cnsm
I Contents

Before Repair
Protection Circurtry.

Page

' External Unit Connections

Enjoy Sound with DOLBY P

Accessories ...... 2 Operation Check and .
Caution of AC Mains Lead 3 Main Component Replacement Procedures 10 ~ 12 -
Location of Controls 3 Power Source ONIOFF ofThis Unit 12 -
Installation ........... 4 Schematic Diagram .............. 13 ~ 16
Flat Cable Connections. 4 Printed Circuit Board Diagram. 17 ~ 19
Antenna Connections 5 Wiring Connection Diagram
Connection of Front and Surround Speakers. 5 Block Diagram........
Connection of Center Speaker .................... 6 Replacement Parts Lis
Connection of AC Power Supply Cord . 6 Cabinet Parts Location
Optional Antenna Connections .......... 6 Packaging ...... . ........
I Before Repair -
(1) Turn off the power supply. Using a 10 52.10 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 50/60 Hz in NO SIGNAL mode should be shown below with respect to supply voltage 230 V/240 V.
Area . (E) (E6) (EB) (GO)
Power supply voltage AC 230 V AC 240 V AC 110 V AC 240 V
Consumed current 50 Hz 60 ~ 220lmA 60 ~ 220 mA 100 ~ 440 mA 50 '- 220 mA
I Protection Circuitry v
The protection circuitry may have operated it either of the' following conditions' is noticed:
* No sound Is heard when the power is switched ON.
* Sound stops during a performance.
The functions of this circuitry is to prevent circuitry damage it for example the positive and negative speaker connection wires are "shorted, or it
speaker systems with an impedance less than the indicated rated impedance of this unit are used.
ltthis occurs follow the procedure outlined below:
1. Switch OFF the power
2. Determine the cause of the problem and correct it.
3. Switch ON the power once again. -
Note:
When the protection circuitry functions, the unit will not operate unless the power is first switched OFF and then ON again. -
I Accessorles
' AC power supply cord 0 Flat cable I 0 Remote control transmitter
(E), {EG) and (GC) areas : (RJAOOiQ-ZK) Long (REXOGSi) .. 1 (RAK-CH201Wl-l) ..........
(EB) area: (VJA0733) ....... . ................ Medium (REXOGBO). 1
Short (RExoeoa) ..§ .................................... 1

(E). (E6) and (GC) v
0 Batteries 0 AM '(LW/MW) loop antenna C Antenna holder
(UM-4, "AAA, R03) ................................... 2 (RSAOOi 2) ................................................ 1 (RMN0244) ................................................. 1
Note: These are available on sales route.
a it: .
0 Mounting screw 0 FM indoor antenna 0 Speaker cords
(XTN3+12Al7) ......................................... 1 (E). (EB) and (EG) areas : (RSAOOO7) ...... 1 (REE0499) 2
(GO) area: (RSAOOOG)... .. 1
SP ,
(E). (EB) and (EG) (GC)
0 Attachment plug 0 Power plug adaptor
v

for (E8) area only (SJP9009)

tor (GC) area only (SJP5213-2)

Page 4

iSE-CH570

I installation

amoeumflfi -9

Stacking the components

Horizontal stacking

@ CD player

@ Tuner/sound processor
© Cassette deck

@ Amplifier

Vertical stacking E]

Tuner/sound processor
@ Amplifier

@ CD player

© Cassette deck

I Flat Cable (included) Connections

Before marking connections:
Make sure the white line on the cable is
on the right side.

Connector

To unplug cables:
Hold the connector from both ends.

W)
m Do not try connecting or discon-

necting the flat cables while the
power is switched to ON.

(short)

(middle)

Placement of speakers

As well as enjoying normal stereo reproduction with the left and right
front speakers, a center speaker and surround speakers can also be
connected to the unit in order to enjoy the sound performance of
DOLBY PRO LOGIC Systems.

We recommend that surround speakers be placed on the side of or
slightly behind the listener, and about one meter higher than ear
level.

However the position should be adjusted to your personal prefer-
ence, because the effect varies to some degree depending upon the
type of music and the music source.

@ Front speaker (Left)
Center speaker

G2) TV (not included)

© This system

(9 Front speaker (Right)

(9 Surround speaker (Left)
(9 Surround speaker (Right)

Tuner/sound processor

CD player

After connection:

Fold and press the cable as flat to the back
of the unit as possible. (To minimize noise
pickup while listening an MW/LW broadcast)

l