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Back to : ETE-3_chassis_(PF21GB300) | Home COLOR TELEVISIONSERVICE MANUAL MODELNO.PF21GB300 CHASSISNO.ETE-3 Please read this manual carefully before service.1. SAFETY INSTRUCTIONS AND MAINTENANCE WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATIONPRECAUTION", "SAFETY PRECAUTION"AND "PRODUCT SAFETY NOTICE"INSTRUCTION BELOW.1.1 X-RAY RADIATION PRECAUTION1.1.1 The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit X-rayradiation as result of excessive EHT voltage. The maximum EHT voltage permissible in any operatingcircumstances must not exceed the rated value. When checking the EHT, use the High Voltage Checkprocedure in this manual using an accurate EHT voltmeter.1.1.2 The only source of X-RAY radiation in this TV is the CRT. The TV minimizes X-RAY radiation, whichensures safety during normal operation. To prevent X-ray radiation, the replacement CRT must be identical tothe original fitted as specified in the parts list.1.1.3 Some components used in this TV have safety related characteristics preventing the CRT from emittingX-ray radiation. For continued safety, replacement component should be made after referring the PRODUCTSAFETY NOTICE below.1.1.4 Service and adjustment of the TV may result in changes in the nominal EHT voltage of the CRT anode.So ensure that the maximum EHT voltage does not exceed the rated value after service and adjustment.1.2 SAFETY PRECAUTION WARNING: REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY.1.2.1 The TV has a nominal working EHT voltage. Extreme caution should be exercised when working on theTV with the back removed. Do not attempt to service this TV if you are not conversant with the precautions and procedures forworking on high voltage equipment. When handling or working on the CRT, always discharge the anode to the TV chassis before removing theanode cap in case of electric shock. The CRT, if broken, will violently expel glass fragments. Use shatterproof goggles and take extreme carewhile handling. Do not hold the CRT by the neck as this is a very dangerous practice..1.2.2 It is essential that to maintain the safety of the customer all power cord forms be replaced exactly assupplied from factory.1.2.3 Voltage exists between the hot and cold ground when the TV is in operation. Install a suitable isolatingtransformer of beyond rated overall power when servicing or connecting any test equipment for the sake ofsafety.1.2.4 When replacing ICs, use specific tools or a static-proof electric iron with small power (below 3 5W).1.2.5 Do not use a magnetized screwdriver when tightening or loosing the deflection yoke assembly to avoidelectronic gun magnetized and decrement in convergence of the CRT.1.2.6 When remounting the TV chassis, ensure that all guard devices, such as nonmetal control buttons, switch,insulating sleeve, shielding cover, isolating resistors and capacitors, are installed on the original place.1.2.7 Replace blown fuses within the TV with the fuse specified in the parts list.1.2.8 When replacing wires or components to terminals or tags, wind the leads around the terminal beforesoldering. When replacing safety components identified by the international hazard symbols on thecircuit diagram and parts list, it must be the company-approved type and must be mounted as the original.1.2.9 Keep wires away from high temperature components.1.3 PRODUCT SAFETY NOTICE 2 CAUTION: FOR YOUR PROTECTION, THE FOLLOWING PRODUCT SAFETY NOTICESHOULD BE READ CAREFULLY BEFORE OPERATING AND SERVICING THIS TV SET.1.3.1 Many electrical and mechanical components in this chassis have special safety-related characteristics.These characteristics are often passed unnoticed by a visual inspection and the X-ray radiation protectionafforded by them cannot necessarily be obtained by using replacements rated at higher voltages or wattage, etc.Components which have these special safety characteristics in this manual and its supplements are identified bythe international hazard symbols on the circuit diagram and parts list. Before replacing any of thesecomponents read the parts list in this manual carefully. Substitute replacement components which do not havethe same safety characteristics as specified in the parts list may create X-ray radiation.1.3.2 Do not slap or beat the cabinet or CRT, since this may result in fire or explosion.1.3.3 Never allow the TV sharing a plug or socket with other large-power equipment. Doing so may result intoo large load, causing fire.1.3.4 Do not allow anything to rest on or roll over the power cord. Protect the power cord from being walkedon, modified, cut or pinched, particularly at plugs.1.3.5 Do not place any objects, especially heavy objects and lightings, on top of the TV set. Do not install the TVnear any heat sources such as radiators, heat registers, stove, or other apparatus that produce heat.1.3.6 Service personnel should observe the SAFETY INSTRUCTIONS in this manual during use and servicingof this TV set. Otherwise, the resulted damage is not protected by the manufacturer.1.4 SAFETY SYMBOL DESCRIPTION The lightning symbol in the triangle tells you that the voltage inside this product may be strong nough tocause an electric shock. Extreme caution should be exercised when working on the TV with the back removed. This is an international hazard symbol, telling you that the components identified by the symbol havespecial safety-related characteristics.UL This symbol tells you that the critical components identified by the UL marking have special safety-relatedcharacteristics.VDE or TUV This symbol tells you that the critical components identified by the VDE/TUV marking havespecial safety-related characteristics.1.5 MAINTENANCE1.5.1 Place the TV set on a stable stand or base that is of adequate size and strength to prevent it frombeing accidentally tipped over, pushed off, or pulled off. Do not place the set near or over a radiator orheat register,or where it is exposed to direct sunlight.1.5.2 Do not install the TV set in a place exposed to rain, water, excessive dust, mechanical vibrations orimpacts.1.5.3 Allow enough space (at least 10cm) between the TV and wall or enclosures for proper ventilation.1.5.4 Slots and openings in the cabinet should never be blocked by clothes or other objects.1.5.5 Please power off the TV set and disconnect it from the wall immediately if any abnormal condition aremet, such as bad smell, belching smoke, sparkling, abnormal sound, no picture/sound/raster. Hold the plugfirmly when disconnecting the power cord.1.5.6 Unplug the TV set from the wall outlet before cleaning or polishing it. Use a dry soft cloth for cleaning 3the exterior of the TV set or CRT screen. Do not use liquid cleaners or aerosol cleaners.2. ADJUSTMENTS2.1 SET-UP ADJUSTMENTSThe following adjustments should be made when a complete realignment is required or a new picture tube isinstalled.Perform the adjustments in the following order:Color purityConvergenceWhite balanceNotes:The purity/convergence magnet assembly and rubber wedges need mechanical positioning. For some picture tubes, purity/ convergence adjustments are not required.2.1.1 Color Purity AdjustmentPreparation:Before starting this adjustment, adjust the vertical sync, horizontal sync, vertical amplitude and focus.