IMPORTANT SERVICE SAFETY INFORMATION
Operating the receiver outside of its cabinet or with its back removed involves a shock hazard.
Those who are thoroughlyfamiliar with precautions necessarywhen working on high voltage
equipment should onlyperformwork on these models.
Exercise care when servicing this chassis with power applied. if carelesslycontacted, can cause
serious shock or result in damage to the chassis. Maintain interconnecting ground lead connections
between chassis, escutcheon, picture tube dag and tuner when operating chassis.
When it is necessaryto make measurements or tests with AC power applied to the receiver
chassis, an Isolation Transformer must be used as a safetyprecaution and to prevent possible damage
to transistors. The Isolation Transformer should be connected between the TV line cord plug and the
AC power outlet.
It is important to maintain specified values of all components and anywhere else in the received
that could cause a rise in operating supplyvoltages. No changes should be made to the original design
of the receiver.
Components shown in the shaded areas on the schematic diagramand/or identified byin the
replacement parts list should be replaced onlywith exact factoryrecommended replacement parts. The
use of unauthorized substitute parts man creates maycreate shock, fire, or other hazards.
Before returning the receiver to the user, performthe following safetychecks:
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. Replace all protective devices such as non-metallic control knobs, insulating fish papers, cabinet
backs, adjustment and compartment covers of shields, isolation resistor-capacitor networks,
mechanical insulators etc.
3. To be sure that not shock hazard exists, a check for the presence of leakage current should be made
at each exposed metal part having a return path to the chassis (antenna, cabinet metal, screw heads
knobs and/or shafts, escutcheon, etc.) in the following manner.
Plug the AC line cord directlyinto a 220V/110V, AC receptacle. (Do not use an Isolation
Transformer during these checks.) All checks must be repeated with the AC line cord plug connection
reversed. (If necessary, a non-polarized adapter plug must be used onlyfor the purpose of completing
these checks.)
PLEASE READ BEFORE ATTEMPTING SERVICE
1. Use an Isolation Transformer when performing anyservice on this chassis.
2. Never disconnect anyleads while receiver is in operation.
3. Disconnect all power before attempting anyrepairs.
4. Do not short anyposition of the circuit while the power is on.
5. For safetyreasons, replace components anywith identical replacement parts (SEE PARTS LIST).
6. Before alignment, warmup the TV for at least 30 minutes.
7. When removing a PCB or related component, after unfastening or changing a wire, be sure to put
the wire back in its original position.
8. Inferior silicon grease can damage IC's and transistors. When replacing IC's and transistors, use
onlyspecified silicon grease. Remove all old silicon when applying new silicon.
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