Sherwood rx 1010 2010 service manual

Page 1

RX-ZOlO

AM/FM

STEREO RECEIVER

RX-lOlO

AM/FM

STEREO RECEIVER

I CONTENTS

Safety Precaution ................. 2
Specifications .............. -. ....... . 3

Block Diagram ................................
Alignment Procedures ...........
P. C. Boards (Top & Bottom Views) ..........

S Sherwood

Wiring Diagram ............
Exploded View (Cabinet & ChaSSis) V
Eiectrical Parts List .............. ..25
Mechanical Parts List.... ..... 30
IC Lead Identifition and Internal Diagram ............. 32
Schematic Diagram ....................... Separate Sheet

Page 2

Safety Precaution

WARNING

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

ing precautions 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
supplements: electrical components having such
features are identified by a A in 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 pans 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 5000 9 per volt or
more sensitivity in the following manner:

Connect a 1500 9 10 watt resistor paralleled by a
0.15pF, 150V AC capacitor, between a known
good earth ground (water pipe, conduct, etc) and
the exposed metallic parts, one at a time. Measure
the AC voltage across the combination of 1500 n
resistor and 0.15pF 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.

Receiver

AC VOLT METER

(5000 9 per volt or more sensitivity)
Reading should not exceed 0.8V

AC Outlet

Good earth ground such as
15009 a water plpe, conduit, etc.

0.15uF150V Ac

Place this probe on each exposed metallic parts.