IMPORTANT SERVICE SAFETY PRECAUTION
BEFORE RETURNING THE RECEIVER
(Fire & Shock Hazard)
Before returning the receiver to the user , perform
the following safety checks.
1. Inspect all lead dress to make certain that leads are
not pinched or that hardware is not lodged between
the chassis and other metal parts in the receiver.
2. Inspect all protectiv e devices such as non-metallic
control knobs , insulating mater ials, cabinet bac ks,
adjustment and compar tment co vers or shields ,
isolation resistor-capacity netw orks, mechanical
insulators and etc.
3. To be sure that no shoc k hazard e xists, chec k f or
leakage current in the following manner.
• Plug the A C cord directly into a 110~220 v olt A C
outlet, (Do not use an isolation tr ansformer for this
• Using two clip leads , connect a 1.5k ohm, 10 w att
resistor paralleled by a 0.15µF capacitor in seires with
all exposed metal cabinet par ts and a kno wn earth
ground, such as electrical conduit or electircal ground
connected to earth ground.
• Use an AC voltmeter having with 5000 ohm per volt,
or higher, sensitivity to measure the AC voltage drop
across the resistor.
• Connect the resistor connection to all exposed metal
parts having a return to the chassis (antenna, metal
cabinet, scre w heads , knobs and control shafts ,
escutcheon and etc.) and measure the A C voltage
drop across the resistor.
AII checks must be repeated with the A C ine cord
plug connection re versed. (If necessar y, a non-
polarized adapter plug m ust be used only f or the
purpose of completing these check.)
Any current measured must not exceed 0.5 milliamp.
Any measurements not within the limits outlined
above indicate of a potential shoc k hazard and
corrective action must be taken before returning the
instrument to the customer.
Many electr ical and mechanical par ts in tele vision
For contin ued protection, replacement par ts m ust be
receivers have special safety-related characteristics.
identical to those used in the original circuit. The use of
These characteristics are often not e vident from visual
substitute replacement patrs which do not have the same
inspection, nor can protection aff orded b y them be
safety char acter istics as the f actor y recommended
necessarily increased by using replacement components
replacement par ts shown in this ser vice manual, may
rated for higher voltage, wattage, etc.
create shock, fire, X-radiation or other hazards.
Replacement par ts which ha ve these special saf ety
characteristics are identified in this man ual; electr ical
components having such features are identified by "å"
and shaded areas in the Replacement Parts Lists and