PLC1/AVC5-UB
SAFETY PRECAUTIONS
NOTICE: Comply with all cautions and safety-related notesLeakage Current Hot Check
located on or inside the cover case and on the chassis or plasmaThis check must be done considering the AVC or the PDP
module.monitor as one instrument each.
WARNING: Since the chassis of the AVC unit and Plasma PanelWith any of the instruments completely reassembled (being
unit is connected to both sides of the AC power supply duringthe instrument either the AVC center or the PDP monitor), plug
operation, whenever the receiver is plugged in, service shouldthe AC line cord directly into a 120V AC outlet. (Do not use an
not be attempted by anyone unfamiliar with the precautionsisolation transformer during this test.) Use a leakage current
necessary when working on this type of receiver.tester or a metering system that complies with the American
ANSI
1. When service is required, an isolation transformer should befor Appliances. In the case of the PDP monitor set the AC
inserted between power line and the receiver before anyswitch first in the ON position and then in the OFF position,
service is performed on a OHOT� chassis receiver.measure from across Line 1 and Line 2 of the three plug
prongs, do not connect with the third prong, which is physical
2. When replacing a chassis in the receiver, all the protectiveground, to all exposed metal parts of the instrument
devices must be put back in place, such as barriers, non-(antennas, handle bracket, metal cabinet, screw heads,
metallic knobs, insulating cover-shields, and isolationmetallic overlays, control shafts, etc.), especially any exposed
resistors, capacitors, etc.metal parts that offer an electrical return path to the chassis.
Any current measured must not exceed 0.5 MIU. Reverse the
3. When service is required, observe the original lead dress.instrument power cord plug in the outlet and repeat test.
AC LEAKAGE TEST
4. Always use manufacturerOs replacement components. Critical
components as indicated on the circuit diagram should not be
(READING
replaced by another manufacturerOs. Furthermore, where aSHOULD NOT
LEAKAGE
short circuit has occurred, replace those components thatBE ABOVE 0.5MIU)
CURRENT
indicate evidence of over heating.DEVICETESTER
UNDER
TEST
5. Before returning a serviced receiver to the customer, the
TEST ALL
service technician must thoroughly test the unit to be certain
EXPOSED
that it is completely safe to operate without danger of electricalMETAL SURFACES
shock, and be sure that no protective device built into theEARTH
3-WIRE CORD
receiver by the manufacturer has become defective, orGROUND
inadvertently defeated during servicing.ALSO TEST WITH PLUG
REVERSED
(USING AC ADAPTER
Therefore, the following checks should be performed for the
PLUS AS REQUIRED)
continued protection of the customer and service technician.
Leakage Current Cold CheckANY MEASUREMENTS NOT WITHIN THE LIMITS OUTLINED
With the AC plug removed from the 120V AC 60Hz source,ABOVE ARE INDICATIVE OF A POTENTIAL SHOCK HAZARD
place a jumper across Line 1 and Line 2 of the three plugAND MUST BE CORRECTED BEFORE RETURNING THE
prongs, do not connect with the third prong, which is physicalRECEIVER TO THE CUSTOMER.
ground.
DC500V
to the AC plug jumper and touch with the other lead each
exposed metal part (antennas, screwheads, metal overlays,
control shafts, etc.), particularly any exposed metal part
having a return path to the chassis should have a resistor
reading over 4M1. Any resistance value below this range
indicates an abnormality which requires corrective action. An
exposed metal part not having a return path to the chassis will
indicate an open circuit.
2
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