4
First issue 09 /03
SAFETY PRECAUTIONS
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 cover shields, 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 manufacturer's replacement components. Especially critical components as indicated on the circuit diagram should
not be replaced by other manufacturers. 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. Also 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 (Gasket, 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.
• 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.
Leakage Current Cold Check
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 shortcut AC plugs and touch the other lead to each exposed metal part
(input/output terminals, screw heads, 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 that requires corrective
action. Exposed metal parts not having a return path to the chassis will indicate an open circuit.
Leakage Current Hot Check
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", measure for current from all exposed metal parts of the cabinet (input/output terminals, screw
heads, metal overlays, control shaft, etc.). Do this particularly for 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.
ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL
SHOCK HAZARD AND MUST BE CORRECTED BEFORE
RETURNING THE SET TO THE CUSTOMER.
Leakage
current
tester
Reading should
not be above
0.5mA
Device
under
test
Test all
exposed metal
surfaces
Also test with
plug reversed
(Using AC adapter
plug as required)
Earth
ground
AC Leakage Test
