Sharp 20LK31M, Service Manual

3

20LK31M
20LK61M

12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212

12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212

12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212

12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212

12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212

12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212

SAFETY NOTICE

Many electrical and mechanical parts in television
receivers have special safety-related characteristics.
These characteristics are often not evident from visual
inspection, nor can protection afforded by them be
necessarily increased by using replacement
components rated for higher voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this manual; electrical
components having such features are identified by "

å

"

and shaded areas in the Replacement Parts Lists and
Schematic Diagrams.

IMPORTANT SERVICE SAFETY PRECAUTION

(Continued)

1. Inspect all lead dress to make certain that leads are

not pinched or that hardware is not lodged between
the chassis and other metal parts in the receiver.

2. Inspect all protective devices such as non-metallic

control knobs, insulating materials, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor-capacity networks, mechanical
insulators and etc.

3. To be sure that no shock hazard exists, check for

leakage current in the following manner.

»

Plug the AC cord directly into a 120 volt AC outlet,
(Do not use an isolation transformer for this test).

»

Using two clip leads, connect a 1.5k ohm, 10 watt
resistor paralleled by a 0.15mF capacitor in series
with all exposed metal cabinet parts and a known
earth ground, such as electrical conduit or electrical
ground connected to earth ground.

»

Use an AC voltmeter having with 5000 ohm per volt,
or higher, sensitivity to measure the AC voltage drop
across the resistor.

For continued protection, replacement parts must be
identical to those used in the original circuit. The use of
substitute replacement parts which do not have the
same safety characteristics as the factory recommended
replacement parts shown in this service manual, may
create shock, fire, X-radiation or other hazards.

BEFORE RETURNING THE RECEIVER

(Fire & Shock Hazard)

Before returning the receiver to the user, perform
the following safety checks.

»

Connect the resistor connection to all exposed metal
parts having a return to the chassis (antenna, metal
cabinet, screw heads, knobs and control shafts,
escutcheon and etc.) and measure the AC voltage
drop across the resistor.
AII checks must be repeated with the AC line cord
plug connection reversed. (If necessary, a non-
polarized adapter plug must be used only for the
purpose of completing these check.)
Any current measured must not exceed 0.5 milliamp.
Any measurements not within the limits outlined
above indicate of a potential shock hazard and
corrective action must be taken before returning the
instrument to the customer.

1.5k ohm

10W

0.15

µ

F

TEST PROBE

CONNECT TO
KNOWN EARTH
GROUND

TO EXPOSED
METAL PARTS

AC

VOLTMETER