Panasonic PT53TW53G - 53" PROJECTION TV HD, Service Manual, Page: 127 / 246

Hot check circuit
Insulation test
Connect an insulation tester between an exposed metallic part and A.C. line. Apply 1080VAC/60Hz for
1 second. Confirm that the current measurement is 0.5mA ~ 2.0mA. Repeat test with other metallic
exposed parts.
X ray radiation
WARNING
The potential source of x ray radiation in the PTV set is in the high voltage section and the picture
tube.
NOTE
It is important to use an accurate, calibrated high voltage meter.
Apply all black video signals (1080i) and confirm high voltage measures 31.5 ± 1.0kV. If the high
voltage is not within the range, change C514 to 1800pF, 2000pF, 2400pF or 2700pF until the desired
value is obtained.ApplyNTSC white pattern and confirm the high voltage measures 30.1 ± 1.5kV. Apply
HD 1080i white pattern and confirm the high voltage measures 30.1 ± 1.5kV.
2. About lead free solder (PbF)
NOTE
Lead is listed as (Pb) in the periodic table of elements. / In the information below, Pb will refer to lead
solder, and PbF will refer to Lead Free Solder. / The lead free solder used in our manufacturing
process and discussed below is (Sn+Ag+Cu). / Thatis Tin (Sn), Silver (Ag) and Copper (Cu) although
other types are available.
This model uses Pb Free solder in it’s manufacture due to environmental conservation issues. For /
service and repair work, we’d suggest the use of Pb free solder as well, although Pb solder may be /
used. / PCBs manufacturedusing lead free solder will have the “PbF” or a leaf symbol stamped on the
/ back of PCB.
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