Pioneer a 337 service manual

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Sefiice
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STEREO AMPLIFIER

A-44
A-447-s
A-337
A-337-S

MODEL A-447, A-447-S, A-337 AND A-337-S HAVE FOLLOWING VERSIONS:
Applicable model

m Mum-nun IMwl mm a
L'llulu-bm morn i. rma». A447

Type Power requirement Export destination
A-447 A-447S A-337 A-337-S
HE O - O '7 AC220V, 240V (swnchable) * European comment
HEWZ O O O O AC220V, 240v (swnchable) * West Germany
SD 0 _ O __ ACHOV, 120-127V, 220V. Kingdom ol Saudi Arabia and
240V (switchable) General market
KUC "" O ._. ACIZOV only U.S.A. and Canada
KC 0 A " AC1 20V only Canada

* Change the primary Wiring.

0 This manual is applicable to the A-447/HE, HEWZ, A-447-S/HEW2, A-337/HE, HEWZ and
A-337-S/HEWZ types.

As to the A-447/HEWZ and A-447-S/HEWZ types, refer to pages 34 - 36.

The A-447-S is the same as the A-447 except for color.

As to the A-337/HEWZ and A-337-S/HEWZ types, refer to pages 37 - 39.

The A-337-S is the same as the A-337 except for color.

Ce manuel pour le service comprend les explications de réglage en trangais.

Este manual de servicio trata del método ajuste escrito en espafiol.

CONTENTS

1. SAFETY INFORMATION
2. EXPLODED VIEWS, PACKING AND PARTS LIST 3
3. FOR A-447/HE TYPE ..................... 7
4. FOR A-337/HE TYPE .................... 23

5. FOR A-447/HEWZ AND A-447-S/HEWZ TYPES 35
6. FOR A-337/HEWZ AND A'337-S/HEWZ TYPES 38
7. PANEL FACILITIES ..................... 41
B. SPECIFICATIONS ...................... 44

PIONEER ELECTRONIC CORPORATION 4-1 Meguro 1-Chome. Meguro-ku Tokyo 153, Japar

PIONEER ELECTRONICS SERVICE INC. PO. Box 1760, Long Beach, Calilomia 90801 USA,

PIONEER ELECTRONICS OF CANADA, INC. 505 Cochrane Drive, Markham, Ontario L3H 8E3 Canada

PIONEER ELECTRONIC [EUROPE] N.V. Keetberglaan 1. 2740 Beveren. Belgium

PIONEER ELECTRONICS AUSTRALIA PTV. LTD. 178-184 Boundary Road. Braesme, Victoria 3195, Australia TEL: [031580-9911

© PIONEER ELECTRONIC CORPORATION 1990

SEV MAY 1990 Printed in Japan

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This service manual is intended for qualified service technicians; t is not
meant for the casual do-it-yourselfer. Qualified technicians have the neces-
sary test equipment and tools, and have been trained to properly and safely
repair complex products such as those covered by this manual.

Improperly performed repairs can adversely affect the safety and reliability
of the product and may void the warranty. If you are not qualified to
perform the repair of this product properly and safely, you should not risk
trying to do so and refer the repair to a qualified service technician.

WARNING

Lead in solder used in this product is listed by the California Health and Welfare agency as
a known reproductive toxicant which may cause birth defects or other reproductive harm

(California Health at Safety Code, Section 25249.5).
or handling circuit boards and other components which contain lead in in
rprotected skin contact with the solder. Also, when soldering do not inhale

When servir
solder, avo.
any smoke a. lumea produced.

1. SAFETY INFORMATION

(FOR USA MODEL ONLVI
LSAFETY PRECAUTIONS

The following check should be performed for the
continued protection of the customer and service
technician.
LEAKAGE CURRENT CHECK

Measure leakage current to a known earth ground
lwater pipe. conduit, etc.l by connecting a leakage
current tester such as Simpson Model 229-2 or
equivalent between the earth ground and all exposed
metal parts of the appliance [input/output terminals,
screwheeds. metal overlays, control shaft, etc.). Plug
the AC line cord of the appliance directly into a 120V
AC 60H: outlet and turn the AC power switch on, Any
current measured must not exceed 0.5mA.

Av- Heading should

thug, not be above
current 05'
tester

Device
under
test

test all
exposed metal
surfaces
erlre cord

® Also test with
Dlup reversed Earth
(bring ac adapter around
p|ug as requlredl

it Leakage lest

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

2.FRODUCT SAFETY NOTICE

Many electrical and mechanical parts in the appli-
ance have special safety related characteristics. These
are often not evident from visual inspection nor the
protection afforded by them necessarily can be ob-
tained by using replacement components rated for vol-
tage, wattage. etc. Replacement parts which have
these special safety characteristics are identified in
this Service Manual.

Electrical components having such features are

identified by marking with a A on 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
PIONEEH Service Manual. A subscription to, or ad»
ditional copies of. PIONEER Service Manual may be

Ahvainnd m n nominal Chara: rnm niouccn,