Sherwood AX 5010 R AX 5015 R Service Manual

Page 1

SERVICE MANUAL

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STEREO
INTEGRATED AMPLIFIER

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STEREO

INTEGRATED AMPLIFIER
I CONTENTS
Safety Precaution ............................................ 2 Exploded View ............................................. 21
Specifications ................................................. 3 Mechanica| parts List ..,. ...... 25
Block Dragram ............................................... 5 Wiring Diagram .................. 27
Circuit Description ------------------------------------------ 6 Electrical Pans List ---------------------------------------- 29
P.C.Boards(Top & Bottom Views) ........................ 9 Schematic Diagram ....................................... 31

S Sherwood

Page 2

Safety Precaution

WARNING

Service should not be attempted by anyone unfamiliar with the necessary precautions on this player. The following pre-

cautions are necessary during servicing.

1. Many electrical and mechanical parts in this player
have special characteristics often pass unnoticed
and the protection afforded by them cannot neces-
sarily be obtained by using replacement compo-
nents rated for higher voltage, wattage. etc.
Replacement parts that have these special safety
characteristic are identified in this manual and its sup-
plements : electrical components having such
features are identified by a Ain the schematic
diagram and the parts list.

Before replacing any of these components, read
the parts list in this manual carefully.

The use of substitute replacement parts that do
not have the same safety characterstics as speci
fied in the parts list may create shock, fire or other
hazards

2. Before returning the set to the customer. always
perform an AC leakage current check on the
exposed metallic parts of the cabinet, such as

terminals, screwheads, metal overlays. etc. to be
sure the set is safe to operate without danger of
electrical shock. Plug the AC line cord directly into
a 120V AC outlet(120V Version only).(Do not

use a line isolation transformer during this check.)
Use an AC voltmeter having SOOOOper volt or
more sensitivity in the following manner :

Connect a 15000 10watte resistor paralleled by a
0.15/ F 150V AC capacitor, between a known
good earth groundlwater pipe, conduct, etc.)and
the exposed metallic parts, one at a time. Measure
the AC voltage across the combination of 15000
resistor and 0.1511 F capacitor. Reverse the AC plug
at the AC outlet and repeat AC voltage measure-
ments for each exposed metallic part. Voltage
measured must not exceed 0.3 volts RMS. This
corresponds to 0.2mA AC. Any value exceeding
this limit constitutes a potential shock hazard and
must be corrected immediately.

Amplifier

AC VOLT METER
(5000mm volt or more sensitivity)
Reading should not exceed 0.8V

0 O

AC Outlet

0.15flF150V AC

Place this probe on each exposed metallic pans.

Good earth ground such as
a water pipe, conduct. etc.

15000