PZ-50HV2E (serv.man4). Safety information - Sharp TV Service Manual (repair manual). Page 2

With the AC plug removed from an AC power source, place
a jumper across the two plug prongs. Turn the AC power
switch on. Using an insulation tester (DC 500V), connect one
lead to the jumpered AC plug and touch the other lead to each
exposed metal part (input/output terminals, screwheads,
metal overlays, control shafts, etc.), particularly any exposed
metal part having a return path to the chassis. Exposed metal
parts having a return path to the chassis should have a
minimum resistor reading of 0.3M

Ω

 and a maximum resistor

reading of 5M

Ω

. Any resistor value below or above this range

indicates an abnormality which requires corrective action.
Exposed metal parts not having a return path to the chassis

will indicate an open circuit.

Plug the AC line cord directly into an AC power source (do not
use an isolation transformer for this check).
Turn the AC power switch on.
Using a "Leakage Current Tester (Simpson Model 229
equivalent)", measure for current from all exposed metal
parts of the cabinet (input/output terminals, screwheads,
metal overlays, control shaft, etc.), particularly any exposed
metal part having a return path to the chassis, to a known
earth ground (water pipe, conduit, etc.).  Any current measured
must not exceed 0.5mA.

Many electrical and mechanical parts in SHARP set 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 higher voltage, 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 

å

 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 SHARP
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 SHARP Service
Manual. A subscription to, or additional copies of, SHARP
Service Manual may be obtained at a nominal charge from
SHARP.

Device
under
test

Leakage
current
tester

Reading should
not be above
0.5 mA

Also test with
plug reversed
(Using AC adapter
plug as required)

Test all
exposed metal
surfaces

Earth ground