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

NOTICE
(FOR CANADIAN MODEL ONLY)
Fuse symbols              (fast operating fuse) and/or               (slow operating fuse) on PWB indicate that replacement parts must
be of identical designation.

REMARQUE
(POUR MODÈLE CANADIEN SEULEMENT)
Les symboles de fusible               (fusible de type rapide) et/ou               (fusible de type lent) sur CCI indiquent que les pièces
de remplacement doivent avoir la même désignation.

NOTICE :Comply with all cautions and safety related notes

located on or inside the cabinet and on the chassis.

The following precautions should be observed :
1. When service is required, even though the PDP UNIT an

isolation transformer should be inserted between the power
line and the set in safety before any service is performed.

2. When replacing a chassis in the set, all the protective

devices must be put back in place, such as barriers,
nonmetallic knobs, adjustment and compartment
covershields, isolation resistor-capacitor, etc.

3. When service is required, observe the original lead dress.

Extra precaution should be taken to assure correct  lead
dress in the high voltage circuitry area.

4. Always use the manufacture's replacement components.

Especially critical components as indicated on the circuit
diagram should not be replaced by other manufacture's.
Furthermore where a short circuit has occurred, replace
those components that indicate evidence of overheating.

5. Before returning a serviced set to the customer, the service

technician must thoroughly test the unit to be certain that it
is completely safe to operate without danger of electrical
shock, and be sure that no protective device built into the
set by the manufacture has become defective, or
inadvertently defeated during servicing. Therefore, the
following checks should be performed for the continued
protection of the customer and service technician.

6. Perform the following precautions against unwanted

radiation and rise in internal temperature.
• Always return the internal wiring to the original styling.
• Attach parts (Gascket, Ferrite Core, Ground, Rear Cover,

Shield Case etc.) surely after disassembly.

7. Perform the following precautions for the PDP panel.

• When the front case is removed, make sure nothing hits

the panel face, panel corner, and panel edge (so that the
glass does not break).

• Make sure that the panel vent does not break. (Check

that the cover is attached.)

• Handle the FPC connected to the panel carefully.

Twisting or pulling the FPC when connecting it to the
connector will cause it to peel off from the panel.

8. Pay attention to the following.

• Be sure to wire the fan. If the fan does not work, the

temperature will rise and cause the protection circuit to
operate.

• When the front case is removed, infrared ray is radiated

and may disturb reception of the remote control unit.

• Pay extreme caution when the front case and rear panel

are removed because this may cause a high risk of
disturbance to TVs and radios in the surrounding.

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

Ë

1. AC Power Cord
2. AC Inlet with Filter
3. Power Switch (S1)
4. Fuse (In the SW POWER SUPPLY Module)
5. STB Transformer and Converter Transformer
    (In the SW POWER SUPPLY Module)
6. Other primary side of the SW POWER SUPPLY Module

Ë

The places where voltage is 100V or more except for the
charged places described above. If the places are touched,
there is a risk of electric shock.

1. SW POWER SUPPLY Module .............................. (225V)
2. X DRIVE Assy ....................................... (–300V to 225V)
3. Y DRIVE Assy ....................................................... (355V)
4. SCAN (A) Assy ...................................................... (355V)
5. SCAN (B) Assy ...................................................... (355V)
6. X CONNECTOR (A) Assy ..................... (–300V to 225V)
7. X CONNECTOR (B) Assy ..................... (–300V to 225V)

AC Inlet with Filter

Power Cord

Power Switch
(S1)

Fig.1 Charged Section and High Voltage Generating Point (Rear View)

: Part is the High Voltage Generating Points
   other than the Charged Section.

: Part is Charged Section.

X DRIVE
Assy

X CONNECTOR (B)
Assy

Y DRIVE
Assy

SCAN (A)
Assy

SCAN (B)
Assy

∗

Remove the IF Earth Metal beforehand when inclines 
the power supply unit as the right figure.

X CONNECTOR (A)
Assy

SW POWER SUPPLY
Module