SAFETY INSTRUCTIONS
SAFETY PRECAUTIONS

WARNING: The chassis of this receiver has a floating ground with the potential of one half the AC line voltage in respect to earth ground. Service should not be attempted by anyone not familiar with the precautions necessary when working on this type of equipment.

READING SHOULD NOT EXCEED 750 mV.

AC VOLTMETER

(5000 ohms per volt or more sensitivity)

The following precautions must be observed:

1.

An isolation transformer must be connected in the power

 

line between the receiver and the AC line before any ser-

 

vice is performed on the receiver.

2.

Comply with all caution and safety-related notes provid-

 

ed inside the cabinet, on the chassis, and on the back.

3.

When replacing a chassis in the cabinet, always be certain

 

that all the protective devices are installed properly, such

 

as control knobs, adjustment covers, shields and barriers.

 

DO NOT OPERATE THIS TELEVISION RECEIVER

 

WITHOUT THE PROTECTIVE SHIELD IN POSITION AND

 

PROPERLY SECURED.

4.

Before replacing the back cover of the set, thoroughly

 

inspect the inside of the cabinet to see that no stray parts

TELEVISION

RECEIVER

1500 ohm

10 watt

0.15 µF 150V AC

AC OUTLET

To be touched to all of exposed metal parts.

Voltmeter Hook-up for Leakage Current Check.

Good earth ground such as a water pipe, conduit, etc.

or tools have been left inside.

Before returning any television to the customer, the

service technician must perform the following safety

checks to be sure that the unit is completely safe to

operate without danger of electrical shock.

ANTENNA COLD CHECK

Remove AC plug from the 120 VAC outlet and place a jumper across the two blades. Connect one lead of an ohmmeter to the jumpered AC plug, and touch the other lead to each exposed antenna terminal (UHF and VHF antenna ter- minals). The resistance must measure between 1M ohm and 5.2M ohm. Any resistance value below or above this range indicates an abnormality which requires corrective action.

PRODUCT SAFETY NOTICE

When replacing components in a receiver, always keep in mind the necessary product safety precautions. Pay special attention to the replacement of components marked with a star (★) in the parts list and in the schematic diagrams. To ensure safe product operation, it is necessary to replace those components with the exact same PARTS.

LEAKAGE CURRENT CHECK

Plug the AC line cord directly into a 120 VAC outlet. (Do not use an isolation transformer for this check.) Use an AC volt- meter, that has 5000 ohms per volt or more sensitivity. Connect a 1500 ohm 10 watt resistor, paralleled by a 0.15 µF 150 VAC capacitor, between a known good earth ground (water pipe, conduit, etc.) and all exposed metal parts of the cabinet (antennas, handle bracket, metal cabinet, screw heads, metal overlays, control shafts, etc.). Measure the AC voltage across the 1500 ohm resistor. The AC voltage should not exceed 750 mV. A reading exceeding 750 mV indicates that a dangerous potential exists. The fault must be located and corrected. Repeat the above test with the receiver power plug reversed.

NEVER RETURN A RECEIVER TO THE CUSTOMER WITHOUT TAKING THE NECESSARY CORRECTIVE ACTION.

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