Table of Contents
Advertisement
2. When servicing, observe the original lead dress, especially the
lead dress in the high voltage circuits. If a short circuit is found,
replace all parts which have been overheated or damaged by the
short circuit.
3. After servicing, observe that all the protective devices such as
insulation barriers, insulation papers, shields, and isolation R-C
combinations, are properly installed.
4. When the receiver is not to be used for a long period of time,
unplug the power cord from the AC outlet.
5. Potential, as high as 31.7 kV is present when this receiver is in
operation. Operation of the receiver without the receiver power
supply. Servicing should not be attempted by anyone who is not
thoroughly familiar with the precautionsnecessary when working
on high voltage equipment. Always discharge the anode of the
picture tube to the receiver chassis before handling the tube.
After servicing make the following leakage current checks to
prevent the customer from being exposed to shock hazards.
1.2. Leakage Current Cold Check
1. Unplug the AC cord and connect a jumper between the two
prongs on the plug. Fig. 2.
2. Turn on the receiver's power switch.
3. Measure the resistance value, with an ohmmeter, between the
jumpered AC plug and each exposed metallic cabinet part on the
receiver, such as screw heads, aerials, connectors, control shafts,
Fig. 1
Fig. 2
3
Advertisement
Table of Contents
