IMPORTANT SERVICE SAFETY INFORMATION
Operating the receiver outside of its cabinet or with its back removed involves a shock hazard. Work on these
models should onlybe performed bythose who are thoroughlyfamiliar with precautions necessarywhen working on
high voltage equipment.
Exercise care when servicing this chassis with power applied. if carelesslycontacted, can cause seriousshockor
result in damage to the chassis. Maintain interconnecting ground leadconnections 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 andthe AC power outlet.
Itis important to maintain specified values of all components and anywhere else in the received that could cause
a rise in operating supplyvoltages. Nochanges should be made to the original design of the receiver.
Components shown in theshaded areas on the schematic diagramand/or identified byin the replacement parts
list should be replaced onlywith exact factoryrecommended replacement parts. Theuse of unauthorized substitute
parts man creates maycreateshock, 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 betweenthe 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 thepresence 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 110V/220V/240V, AC receptacle. (Do not use anIsolation 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. Usean 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. Beforealignment, warmup the TV for at least 30minutes.
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 only
specified silicon grease. Remove all old silicon when applying new silicon.
9. Beforeremoving the anode cap, discharge eletricitybecause it contains high voltage.
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