Pioneer sg 750 service manual

Page 1

CIRCUIT DESCRIPTIONS
REPAIR & ADJUSTMENTS O R D E R N 0.

ARP-486-0

- THE PHOTO SHOWS 56-750

GRAPHIC EQUALIZER

6-750

SIS-705

MODEL SG-750 COMES IN FIVE VERSIONS DISTINGUISHED AS FOLLOWS:

Type Voltage Remarks
KU ACIZOV only USA model
HEM AC220V, 240V (Swnchable) European comment model
5 ACHOV, 120V, 220V, 240V (Switchable) General export model
S/G ACHOV, 120V, 220V, 240V lSWItchablel U.S. MIlItary model
YP ACZAOV only Australla model

o This service manual is applicable to the SG-750/HEM, KU, S, 8/6, YP and SG-705/S.
0 As to the SG-750/KU, S, 8/6, YP. please refer to pages 30, 31.

c As to the SG-705/S, please refer to page 32.

o SG-705 is the same as the SG~750 except for the design (color) only.

0 Ce manual d'instruction se refére au mode de réglage, en frangais.

o Este manual de servicio trata del metode ajuste escrito en espafiol.

CONTENTS

1 SAFETY INFORMATION ................... 2 9. P.C. BOARDS CONNECTION DIAGRAM _____ 18
2. SPECIFICATIONS ........................ 3 10. SCHEMATIC DIAGRAM 21
3. FRONT PANEL FACILITIES ................ 4 11. ELECTRICAL PARTS LIST ................ 25
4. PARTS LOCATION ....................... 5 12, ADJUSTMENTS .......................... 27
5, EXPLODED VIEW ........................ 7 REGLAGE ............................. 28
6. PACKING ............................... 9 AJUSTE ................................ 29
7. BLOCK DIAGRAM ........................ IO 13. FOR KU, S, 8/6 AND YP TYPES .. 30
8. CIRCUIT DESCRIPTION ................... 12 14. FOR SG-705/S TYPE ..................... 32

PIONEER ELECTRONIC CORPORATION 471, Meguro HZhome. Megurcrku, Tokyo 153, Japan
RIONEER ELECTRONICS [USA] INC. no. Box 1780. Long Beach CalIFQrnIa 90801 LISA.
TEL: [EDD] 421714134. [EDD] 237-0424
PIONEER ELECTRONIC [EUROPE] N.v. Keecberglaan 1, 2740 Beveren, Belglurn TEL: [DB/7752808
PIONEER ELECTRONICS AUSTRALIA RTv. LTD. 171371 84 Boundary Road, Braeslde, Viscoma 3195, Auscraha
TEL [DC-3) SBD-EIBII

SUD JUNE 1984 Printed in Iapan

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SIS-750

1. SAFETY INFORMATION

LSAFETY PRECAUTIONS
The following check should be performed for the

continued protection of the customer and service tech-

nician.
LEAKAGE CURRENT CHECK

Measure leakage current to a known earth ground
(water pipe, conduit, etc.) by connecting a leakage current
tester such as Simpson Model 2292 or equivalent between
the earth ground and all exposed metal parts of the appli»
ance (input/output terminals, screwheads, metal overlays,
control shaft, etc.). Plug the AC line cord of the appliance
directly into a 120V AC 60Hz outlet and turn the AC
power switch on. Any current measured must not exceed

0.5mA.
Reading should
a
Leakage not be above
Dewce current 0.5mA
under tester

test

Test all
exposed metal
surfaces

2-wire cord

@ Also test with
plug reversed
(Using AC adapter ground

plug as required]

AC Leakage Test

ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A PO-
TENTIAL SHOCK HAZARD AND MUST BE COR.-
RECTED BEFORE RETURNING THE APPLIANCE
TO THE CUSTOMER.

2. PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in the appliance
have special safety related characteristics. These are often
not evident from visual inspection nor the protection
afforded by them necessarily can be obtained by using
replacement components rated for voltage, wattage, etc.
Replacement parts which have these special safety charac»
teristics are identified in this Service Manual.

Electrical components having such features are identified

by marking with aAon the schematics and on the parts
list in this Service Manual.
The use of a substitute replacement component which
dose not have the same safety characteristics as the
PIONEER recommended replacement one, shown in the
parts list in this Service Manual, may create shock, fire,
or other hazards.

Product Safety is continuously under review and new
instructions are issued from time to time. For the latest
information, always consult the current PlONEER Service
Manual. A subscription to, or additional copies of, PlONEER
Service Manual may be obtained at a nominal charge from
PIONEER.